HomeMy WebLinkAbout20230958.tiffCOLORADO
Division of Reclamation,
Mining and Safety
Department of Natural Resources
RECEIVED
OCT 2 2 2024
WELD COUNTY
COMMISSIONERS
NOTICE
Consideration of Construction Materials Reclamation Permit
Surety Reduction Request
DATE: October 22, 2024
TO: Weld County Commissioners
1150 O St
P.O. Box 758
Greeley, CO 80631
FROM: Patrick Lennberg
RE: Two Rivers Sand, Gravel and Reservoir Project - File No. M-2022-013, Raptor Materials LLC
Surety Reduction Request (SR -1)
Surety Reduction Request No. 1
Please be advised that on October 18, 2024, Raptor Materials LLC, whose address and telephone number
are 8120 Gage Street, Frederick, CO 80516; (214) 432-2017, filed an application for a/an Surety Reduction
Request (SR- 1) to M2022013, Two Rivers Sand, Gravel and Reservoir Project, which is located
approximately 1.5 miles Southwest of Greeley, Section 3, Township 4N, Range 66W, 06th Principle
Meridian, in Weld County.
Surety reduction request based on the reclamation cost estimated determined in TR-1. The request is to
reduce the financial warranty from $1,220,834.00 to $916,981.00 a difference of $303,853.00.
Written comments or objections to the application may be submitted to and additional information obtained
from Patrick Lennberg at the Division of Reclamation, Mining and Safety, 1313 Sherman St. Room 215
Denver, CO 80203, by telephone at (720) 665-0836.
Comments or objections should be submitted within fifteen (15) days of this notice to be considered in the
application review process. The Division is required to provide a thirty (30) day period following a decision
on the release application to allow for appeals to its decision.
M-GR-03A-P
Physical Address: 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106
Mailing Address: DRMS Room 215, 1001 E 62nd Ave, Denver, CO 80216 https://drms.colorado.gov
Jared S. Potts, Governor I Dan Gibbs, Executive Director 1 Michael A. Cunningham, Di or
71,L bl i C, Re i tiA) c c�'� 1. L D PI &TZ) M,N.1 PA-) D&4 MK
1olz$(z 70U -1416K Dl) 11)1,115x)
�
to)7:ZIZ,-1
ZoZ3- 0955
Tuesday, September 10, 2024
To:
From:
Weld County Clerk to Board
1150 O Street
Greeley, CO 80632
Garrett C. Varra
Raptor Materials, LLC.
8120 Gage Street
Frederick, CO 80516
Subject: Technical Revision #1 - Materials Processing Area and Wash Pond Relocation,
Conveyor Removal
Second Adequacy Response
Parcel 124 - Two Rivers Sand, Gravel, and Reservoir Project
DRMS Permit M-2022-013
The following materials shall be submitted to the Colorado Division of Mining, Reclamation, and
Safety (DRMS) for placement for public review:
• Correspondence of September 10, 2024 from Raptor Materials, LLC. to the Colorado
Division of Mining, Reclamation, and Safety, with attending attachments.
Attachments:
• Proof of Placement — Weld County Clerk to the Board
• Report Exhibits (Revised 9/10/2024): Exhibit C — Reclamation Plan, Exhibit L — Reclamation
Costs
• Map Exhibits (Revised 9/4/2024): Exhibit C2 — Extraction Plan, Exhibit L — Financial Warranty
Your signature below acknowledges receipt of the above -referenced material, as attached. The
material should be added to the above -referenced Application, as originally submitted to the Weld
County Clerk to the Board and made accessible for public review.
Received on:
RECEIVED
SEP 1 1 1024
WELD COUNTY
COMMISSIONERS
By:
Office of the Weld County Clerk to the Board of County Commissioners
eRAbli c.seRiZvi bt,u
91likA
C,C; FL i`-ritVkP I I> Ff ) PA -I ktisS) )
TO (cm IC.K1 DP I V IA I 5E)
alizlzA
i 07,3 - () R5`3
RAPTOR
MATERIALSLLc
8120 Gage Street • Frederick, CO 80516
Bus: (303) 666-6657 • Fax: (303) 666-6743
September 10, 2024
To: Patrick Lennberg
Environmental Protection Specialist
Colorado Division of Reclamation Mining and Safety
Office of Mined Land Reclamation (OMLR)
1313 Sherman Street, Room 215
Denver, Colorado 80203
From: Garrett Varra
Raptor Materials LLC
8120 Gage Street
Frederick, Colorado 80516
Subject: Parcel 124 — Two Rivers Sand, Gravel, and Reservoir Project, File No. M-2022-013;
Technical Revision (TR-01), Materials Processing Area and Wash Pond Relocation and Conveyor
Removal; Adequacy Review No.2 RESPONSE
Dear Mr. Lennberg,
The Division of Reclamation, Mining and Safety (Division/DRMS), Office of Mined Land
Reclamation (OMLR), reviewed the contents of the Technical Revision (TR-01) for the Materials
Processing Area and Wash Pond Relocation and Conveyor Removal for the P124 — Resource
Development Project (RDP), File No. M-2022-013. Raptor Materials received a Preliminary
Adequacy Review (PAR) dated July 18, 2024. Following submittal of the Preliminary Adequacy
Response on August 22, 2024, Raptor Materials received Adequacy Review No. 2 of the TR-01
on August 28, 2024.
Raptor's second adequacy responses below follow the comments from the adequacy review
and are highlighted in blue font for clarity.
DRMS Comment no.1
Please provide a detailed summary of the proposed changes in Exhibit L compared to what was
approved during the original application process (specifically Exhibit L provided during adequacy
review response no. 4). At a minimum, it appears the Operator is proposing to reduce the
reclamation liability by reducing the area proposed to be disturbed during the initial phase of
mining from 70.21 acres to 51.07 acres. While the relocation of the processing and plant area
eliminates the need for a conveyor system.
See the executive summary on pages 2 — 3 of the updated Exhibit L text for a summary of the
changes to Exhibit L associated with the Two Rivers Technical Revision 1 ("P124 TR01").
A marked -up version of Exhibit L that shows all changes from the original Two Rivers permit
submittal was provided to Rob Zuber informally via email separate from the official online
submittal, in order to facilitate review. A copy of that marked -up version will be forwarded.
DRMS Comment no.2
In Exhibit L, page 2, the area of the yellow hatched area needs to be provided. The area
dimensions must be clearly shown on the Exhibit L map.
The 50.11 -acre initial extraction area (yellow hatch on Exhibit L) is stated on page 4 of Exhibit L.
The acreage has been added to the map Exhibit L and Exhibit C-2.
DRMS Comment no.3
In Exhibit L, page 4 second paragraph, it is stated that the initial excavation will be 51 acres
resulting in 4,310 ft of external perimeter pit wall. In the original application the initial
excavation was to 40 acres resulting in 6,200 ft of external pit wall. Please explain the
difference.
The initial excavation area has been corrected to 50.11 acres. The external perimeter pit wall
length has been corrected to 4,294 feet and the advancing highwall length has been corrected
to 1,882 feet, for a total of 6,176 feet of pit wall. These lengths are reflected on the updated
Map Exhibits C-2 and L. The reasons for these changes have been added to the executive
summary of Exhibit L.
DRMS Comment no.4
In Exhibit L, page 4 third paragraph, there appears to be a discrepancy between the lengths
provided in this paragraph compared to the preceding paragraph, please clarify.
The lengths have been corrected. The sum of the walls with different slopes (2,089 ft at 2H:1V
and 4,087 ft at 1.25H:1V) is equal to the total excavation perimeter (6,176 ft).
DRMS Comment no.5
Please explain how the volume of water to be removed from the 51.1 acres was calculated in
the dewatering task. The Division used the calculation method detailed in the approved exhibit
and arrived at a different volume which in turn results in a different cost estimate.
The volume of water ponded within the revised 50.11 -acre excavation, to be removed as part
of the initial dewatering cost estimate line item was calculated using a surface volume
calculation in a 3D CAD program. A statement to this effect has been added in the third
paragraph on page 6 of the Exhibit L text. The method in the originally -approved Exhibit L uses
an average storage for the Central Field, multiplied by the initial excavation area.
DRMS Comment no.6
The 30 -day dewatering volume calculation appears to have been calculated incorrectly,
please verify and update as needed.
The calculation has been updated with the corrected quantities. See comment in Exhibit L text
P124 TRO1 Executive Summary regarding rounding errors and significant digits.
DRMS Comment no.7
In the grading task, page 5, the highwall lengths need to be consistent with the lengths
provided in the preceding sections.
Lengths have been corrected and updated in this section and throughout the report.
DRMS Comment no.8
The highwall length to be excavated at 2H:1V length of 2,121 feet could not be verified on Map
C-2. The length closest to this value is the 2,150 feet along the southern portion of yellow
hatched area. Should these two lengths be the same or what accounts for the difference?
Exhibit L map needs to be updated with a consistent length to be used.
The 2H:1V highwall length has been corrected to 2,089 feet. The Exhibit L text, financial
warranty estimate, and Exhibit Maps C-2 and L have been updated accordingly.
DRMS Comment no.9
The highwall length to be excavated at 1.25H:1V length of 4,069 feet could not be verified on
Map C-2. The combined lengths of the three remaining highwall faces of the yellow hatched
area combine to a lower value of 3,937 feet. Please clarify the discrepancy. Exhibit L map
needs to be updated with the lengths clearly depicted that sum to the value to be used.
Map Exhibit L has been updated to reflect the correct highwall lengths (2,089 ft at 2H:1V and
4,087 ft at 1.25H:1V).
DRMS Comment no.10
Please provide a figure or describe where the 1,880 foot of advancing wall is located. The
Division assumes this is the eastern wall of the yellow hatched area.
The 1,882 -foot advancing wall is the eastern wall of the yellow hatched area. A call -out has
been added to Map Exhibits C-2 and L. Additionally, the wall is described in the second
paragraph on page 4 of the Exhibit L text; an additional description has been added to the
fourth paragraph on page S.
DRMS Comment no.11
Please provide a figure or describe where and how the 4,320 foot extraction limit wall
was calculated.
The length of the pit extraction wall limit has been corrected to 4,294 feet. This length
is the sum of the north (1,290 ft), west (915 ft), and south (2,089 ft) pit walls of the
initial excavation area that coincide with the final pit excavation limits.
DRMS Comment no.12
A cost estimate calculation for the keyway at the base of the liner was not provided,
please provide this calculation or if it is not required provide an explanation as to why.
The methods for calculation of the financial warranty elements were redone as part of the P124
TRO1 to better align with the DRMS's approach (using the CIRCES software). The keyway
quantities are integrated into overall liner cost calculations.
DRMS Comment no.13
In the currently approved Exhibit L there is a cost for a perimeter liner at 3H:1V. Why
was a similar liner cost estimate not provided in the exhibit currently under review?
The methods for calculation of the financial warranty elements were redone as part of the P124
TRO1 to better align with the DRMS's approach (using the CIRCES software). The perimeter liner
quantities are integrated into overall liner cost calculations. Additionally, the 3H:1V perimeter
liner itemized in the originally -approved Exhibit L was associated with the internal core wall,
which has been removed from the updated mining plan.
DRMS Comment no.14
Please review the volume calculation for soil replacement on 4.8 acres on the Center of
the Central Field, the Division calculated a lower volume of material needed.
See comment in Exhibit L text P124 TRO1 Summary regarding rounding errors and
significant digits. This acreage has been refined in the Exhibit L text to 4.83 acres so that
hand calculations based on the text quantities will more closely reflect the calculated
volume.
DRMS Comment no.15
Costs for the establishment and reseeding are not correctly calculated as shown on page
12. Please verify the calculations and update the costs accordingly.
The re -seeding calculations submitted in P124 TRO1 were completed using the same unit cost
and failure rate as in the DRMS's March 2023 Reclamation Cost Estimate. The text on page 13
of Exhibit L has been modified to better reflect this. All calculations in this section have been
updated with corrected quantities, and costs updated accordingly.
Please find attached the following documents as our response:
Updated Report Exhibit E — Reclamation Plan
Updated Report Exhibit L — Reclamation Costs
Updated Map Exhibit C-2 — Extraction Plan Map
Updated Map Exhibit L — Financial Warranty Map
The current decision date is September 19, 2024.
Regards
Garrett Varra
tt-
SOUTH BANK OF BIG
THOMPSON RIVER
ERIAL
SING I
8.4± ,.
T
NW FIELD =
41.04± ACRES
5 CENTRAL FIELD
WEST SECTION
POSSIBLE PARKING & LUUIFMLNF
STORAGE (SUBJECT TO CHANGE)
SW WASH POND
5.8 ACRES
SOUTH PLATTE RIVER
1
I GENERAL INING PROGRESSION*
NOTE THE EXTRACTION AREA SIZE
SHAPE, AND FACE ORIENTATION MAY
VARY FROM THAT PORTRAYED
DEPENDING ON FIELD CONDITIONS
GENERAL MINING PROGRESSION
NORTH BANK OF
SOUTH PLATTE RIVER
OIM
CENTRAL FIELD
NORTH-EAST SECTION
TEMPORARY SOIL STOCKPILE LOCATION
CENTRAL FIELD
= 162.57± ACRES
CENTRAL FIELD
CENTRAL SECTION
ADVANCING HIGHWALL
2H -IV CUT SLOPE
SOIL STOCKPILES
STOCKPILING OF SALVAGED SOIL ABOVE THE
EXISTING GROUND ELEVATION WILL NOT
OCCUR IN A MANNER UNDERSTOOD TO
OBSTRUCT FLOOD WATERS WHERE THEY
MIGHT OCCUR WITHIN THE EXISTING
FLOODPLAIN IT IS UNDERSTOOD AND
AGREED HERE -IN THAT THEIR LONGITUDINAL
DIMENSIONS SHOULD EXTEND PARALLEL TO
ANTICIPATED FLOOD FLOWS UNLESS THE PIT,
IS INTENDED AS SHORT TERM STORAGE
OUTSIDE OF SEASONAUTY WHERE FLOODING
MIGHT BE MORE REASONABLY ANTICIPATED
LEGEND
V
PERMIT BOUt
- PARCEL BOU
WCR396SET
EXTRACTION
DIRECTION 0
EXTRACTION
POINT OF AC'
KEYWAY
vRaIEGT I wo Rivers Sand, Gravel and Reservoir Project TRO1
1205b
"°"S i 1A
1 ±Acres basins Total + �.d±Acre Wash
R.0.W & Eosements not shown from Exhibit C-1: Existing Conditions Mop, are obsolete
Peter °q""� `4 i°
F Uf ldChristens chmicy�f,
14112.,x«
or vacated. Dint 21)24.090/
en �. ul� am
Drawn by
M• Thompson
Checked
by. P. E.
Christensen
��'r i inch 200 feet
a
DAIS: 22 Februar 2022
Y
REVISI°Ir: 4 September 2024
ep
DRAWING: Exhibit C-2: Extraction Plan Map
PAGE' 1 OF 1
l
mD1 4666 6,
ITH BANK OF BIG
IOMPSON RIVER
NW FIELD =
41.04± ACRES
CENTRAL FIELD
WEST SECTION
SW WASH POND
5.8 ACRES
DISCHARGE
PIPE
SOUTH PLATTE RIVER
GENERAL MINING PROGRESSION
NOTE THE EXTRACTION AREA SIZE.
SHAPE. AND FACE ORIENTATION MAY
VARY FROM THAT PORTRAYED
DEPENDING ON FIELD CONDITIONS.
GENERAL MINING PROGRESSION
144 t TI:r_s 11
NORTH BANK OF
SOUTH PLATTE RIVER
yr - r/ tW tM s.
J-. a�......• -• .- r ..• . ........• ... _...
r...- r r.-✓-- w r• 4....r . .....+
y .-w r. Jo /,M�i r- r _. -. . -.. •..... -.• .- . -- -. w .r
-..•• pa— ^..- -.• •••-. • .-+ .-?w...• ..... .-.. ._ ... �.� r
r y.ye
...- ---
r. .l.
ye ye.
.-.. .. -
... r _ . .. -e -• .. .« .« ......
_ a
- ... we, r •••
.. Yr w A r .-..- ..... N ..• .-• Y. FY
• r .. y �r•i. -....t -.I a -....I •Y - Or
Yr. •.I ��a.rr .. - • -.- w..-..— X
.- •-- 4.- - .Y"
CENTRAL FIELD
NORTH-EAST SECTION
TEMPORARY SOIL Si OCKPILE LOCATION
CENTRAL FIELD
= 162.57± ACRES
CENTRAL FIELD
CENTRAL SECTION
ADVANCING HIGHWALL
2H:1V CUT SLOPE
I
1
1
LEGEND
PERMIT BC
PARCEL BC
WCR 396 S
EXTRAC TIC
DIRECTION
EXTRACTIC
WESTERVI
STOCKPILE
V POINT OF
FIELD SEC
KEY WAY
nwicr.
1 wo Rivers
.)LB � Vr aver and Reservoir Project TRO1
Hotso�wy'
203.61 ±Acres Basins Total
+
t,y
5.8±Acre Wash Pond Peter
Christensen 1425:16 04•ar
Drown by.
hi Thompson
Ct,c,_>r:;
bChristensen
semi_
' inch a 200 feet
22ruary �074
2eP
oRA�.
Exhibit L:
Financial Warranty Map
ember
PAGE
1 or 1
Page 11
6.4.5 EXHIBIT E - Reclamation Plan
(1) In preparing the Reclamation Plan, the Operator/Applicant should be
specific in terms of addressing such items as final grading (including
drainage), seeding, fertilizing, revegetation (trees, shrubs, etc.), and
topsoiling. Operators/Applicants are encouraged to allow flexibility in
their plans by committing themselves to ranges of numbers (e.g., 6"-12" of
topsoil) rather than specific figures.
(2) The Reclamation Plan shall include provisions for, or satisfactory
explanation of, all general requirements for the type of reclamation
proposed to be implemented by the Operator/Applicant. Reclamation shall
be required on all the affected land. The Reclamation Plans shall include:
(a) A description of the type(s) of reclamation the Operator/Applicant
proposes to achieve in the reclamation of the affected land, why each
was chosen, the amount of acreage accorded to each, and a general
discussion of methods of reclamation as related to the mechanics of
earthmoving;
(b) A comparison of the proposed post -mining land use to other land
uses in the vicinity and to adopted state and local land use plans and
programs. In those instances where the post -mining land use is for
industrial, residential, or commercial purposes and such use is not
reasonably assured, a plan for revegetation shall be submitted.
Appropriate evidence supporting such reasonable assurance shall be
submitted;
(c) A description of how the Reclamation Plan will be implemented to
meet each applicable requirement of Rule 3.1;
(d) Where applicable, plans for topsoil segregation, preservation, and
replacement; for stabilization, compaction, and grading of spoil; and
for revegetation. The revegetation plan shall contain a list of the
preferred species of grass, legumes, forbs, shrubs or trees to be
planted, the method and rates of seeding and planting, the estimated
availability of viable seeds in sufficient quantities of the species
proposed to be used, and the proposed time of seeding and planting;
(e) A plan or schedule indicating how and when reclamation will be
implemented. Such plan or schedule shall not be tied to any specific
date but shall be tied to implementation or completion of different
stages of the mining operation as described in Rule 6.4.4(1)(e). The
plan or schedule shall include:
(i) An estimate of the periods of time which will be required for
the various stages or phases of reclamation;
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page i 2
6.4.5 EXHIBIT E - Reclamation Plan
(ii) A description of the size and location of each area to be
reclaimed during each phase; and
(iii) An outline of the sequence in which each stage or phase of
reclamation will be carried out.
(The schedule need not be separate and distinct from the
Reclamation Plan, but may be incorporated therein.)
(f) A description of each of the following:
(i) Final grading - specify maximum anticipated slope gradient or
expected ranges thereof;
(ii) Seeding - specify types, mixtures, quantities, and expected
time(s) of seeding and planting;
(iii) Fertilization - if applicable, specify types, mixtures, quantities
and time of application;
(iv) Revegetation - specify types of trees, shrubs, etc., quantities,
size and location; and
(v) Topsoiling - specify anticipated minimum depth or range of
depths for those areas where topsoil will be replaced.
Acknowledged. Rule G.4. S(1) is an advisory statement, the particulars of
which are provided for, below.
MISSION STATEMENT: Utilizing Resource Recovery of Sand and Gravel as a
Method of Conservation to Establish DEVELOPED WATER RESOURCES; and
to function as a Foundation for the implementation of other beneficial
Multiple End -Uses over the Property.
Reclamation and Development of the Property over Time.
The majority of sand, gravel and other earth product demand, like water, is the
consequence of market forces resulting from urbanization. The commercial,
industrial, transportation, and other land use matrixes arise to support and
sustain a growing residential population. Governments count the roof tops for
they rely upon public and commercial revenue to sustain the roads, schools,
water supply and infrastructure needed to secure it. With continued growth of
human habitat and development in Colorado, the products that make possible
the construction and maintenance of it all, comes from the ground.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -- COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 13
6.4.5 EXHIBIT E - Reclamation Plan
Unconsolidated aggregate deposits simply must be taken where they are
formed. The aggregate resource must be recovered from undeveloped
locations first, before those locations are overtaken by ever expanding urban
development; or it is lost. Now is the time and this is the geologically
determined and economically feasible location from which the proposed
extraction activity must occur. Hence, the Two Rivers Sand Gravel and
Reservoir Project.
Underlying earth resources are too often squandered when human
development occurs in advance of resource extraction and recovery.
Extraction and resource recovery are required by Colorado law to occur in
advance of development where sand and gravel deposits are present. The
resource is 'recovered' to benefit inevitable and unrelenting human habitat and
infrastructure expansion, while providing a more enduring indigenous buffer
to the very impacts it serves.
The extraction of aggregate resource is in fact resource conservation. Beyond
that, it is an essential social asset. Without earth products, transportation
maintenance costs increase as infrastructure begins to fall apart. Industries
begin to shrink, along with correlated revenues for state and local
governments. Impacts would likely spread downstream from there, degrading
schools and everything else dependent upon government revenue, as taxes
increase to make up the difference. Affected populations would likely begins
to flee an ever-increasing tax burden, further depreciating home values while
accelerating loss of revenues from ever diminished home valuations, loss of
businesses, jobs, and ultimately the very infrastructure itself. Without earth
products, the economic engine and quality of life for everyone, begins to
unravel.
The secondary and enduring benefit of mineral extraction is in the reclamation
and restoration of extracted lands. Extraction of aggregate resources is
comparatively temporary and transitional by its very nature. Reclamation at
this location is geared to lay a foundation that will capture both short and long-
term multiple -end use benefits that will complement the dynamic mix of
surrounding land uses over time. While residential, commercial, and industrial
development will eventually be inspired by economic forces over portions of
the Two Rivers property; the primary end use will be the creation of essential
Developed Water Resources.
An understanding of the vital importance of aggregate resources to the people of
Colorado is not new, but well established; and protected. It remains the stated
duty of any governing body in Colorado to aid in the lawful recovery of these vital
mineral resources under Title 34. Section 22-5-80 of Weld County's Code of
Regulations is consistent with Colorado law, both of which require that this
resource must be recovered prior to other development which would otherwise
impede access to it. Municipalities are obligated for the sake of their citizens to
assert the same.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112) CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page I4
6.4.5 EXHIBIT E - Reclamation Plan
The subsequent development of a diverse multiple land use potential at this
location, when complemented with sound environmental parameters, as advanced
under this application and the attending OMLR permit exhibits, is in keeping with
the spirit and intent of the policies and goals of the State of Colorado, Weld
County, and the Towns of Evans and Milliken. Approval of the application will
allow the resource to be accessed and utilized in a responsible and orderly
manner as required under both Colorado law, and consistent with local County
and Municipal Regulations.
Specific Reclamation Elements and Methods:
This application provides substantial detail of features utilizing aerial
photography that is ortho-rectified to approximately 1.0± percent of surveyed
accuracy. This highly accurate and detailed portrayal of planned extraction and
reclamation is visible under Exhibit C-1: Existing Conditions, Exhibit C-2:
Extraction Plan Map, and Exhibit F - Reclamation Map. How reclamation will
occur over affected lands is further detailed under Exhibit L - Reclamation Costs.
As extraction progresses over the Fields south of the Big Thompson River, the
resulting 1.2 5 H:1 V slopes (2H:iV, where indicated) created during extraction will
be concurrently modified when and where practical. Concurrent reclamation is a
natural incentive for Operations to speed site recovery while generally serving to
lower attending financial warranty burdens. The cut slopes along the extraction
limits perimeter will be finish graded by methods including pushing the resulting
pit bottom with a dozer upslope, excavation, hauling and placement of pit bottom
material as backfill, or backfilling using previously excavated surplus material of
limited or low market value until the resulting basin slopes conform with Rule
3.1.5(7).
Since the primary end use is Developed Water Resources, the basins are intended
to hold waters based upon the rights assigned by decree, or as stipulated in
regulatory compliance with the Colorado Division of Water Resources, Office of
the State Engineer (OSE). This may include the need to augment water sufficient
to cover the anticipated exposed groundwaters of the basins in the unlined state.
The entire unlined basin is or will be sufficiently covered under an approved
substitute supply plan. In order to again liberate waters set aside for
augmentation, the basins will at some point in the life of the activity be lined to
segregate the basin from Colorado groundwaters.
Lining of basins involves the placement of low permeability compactable fill, from
on -site or other suitably sourced geologic materials, into the keyway (dewatering
trench'); the same keyway used to facilitate discharge to keep the basins dry and
1 Adequacy Item 15: Keyway clarification
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 15
6.4.5 EXHIBIT E - Reclamation Plan
free of groundwaters at the time of extraction. The balance of the basin floors
(where needed) and slopes are also covered and compacted with the same
materials until it meets the standards established under the August 1999 State
Engineer Guidelines for Lining Criteria. Typical to obtaining approval for the
constructed liner, the lined basin must pass a 90 -day leak test. Correspondence
from the OSE approving the construction of the lined basin will be submitted to
the OMLR on receipt; or as part of any request for release of the permit, in part or
whole.
Essentially, the pushed parent rock material will form the minimum 3h:lv slopes
of the basin and be compacted to a permeability of 106; forming a lined basin that
complies with Colorado Water Law and Guidelines mentioned, above. In this
manner, the lined basins will maintain a required separation and accounting of
stored water from the underlying ground waters. Evidence of compliance with
the rules and regulations of the Colorado Division of Water Resources will be
provided to the OMLR on completion of the lined basins.
Raptor has extensive experience successfully constructing lined storage reservoirs
with several prior projects completed, tested and approved by the OSE. The
deposit contains extensive materials suitable for use in constructing the liner
including claystone, sandstone-claystone-siltstone and sandstone-siltstone
bedrock, clay lenses in the sand and gravel deposit, and overburden often
comprised of low plasticity sandy silty clay to silty sand. Excess topsoil has also
been successfully used as a liner construction material and would be available
from the temporary topsoil stockpile location in the North-East Section of Central
Field. Other materials encountered within the sand and gravel deposit during
excavation would be stored in temporary piles on the excavation floor.
Parameters such as plasticity, percentage of fines etc. have not been determined
for the deposit materials at this time but extensive experience in constructing
several approved lined storage reservoirs with similar materials along the South
Platte river provides high confidence in the availability of suitable materials
within the extraction area.
The liner will be progressively constructed once the pit is developed sufficiently
to allow regrading and any problems with the efficacy of the liner can usually be
detected prior to leak testing through evidence of seeps in the constructed liner
which can have remedial action taken. Similarly, although not common, seeps are
sometimes observed in the bedrock floor. While these have generally in Raptor's
extensive experience proved to be self -healing, where needed remedial action and
spot lining and compaction would be undertaken.
Liner construction involves building a compacted low permeability core by
placing and compacting suitable material in 6"± lifts. A Caterpillar 815 or 825 (or
equivalent) compactor generally makes 2-4 passes to achieve suitable compaction
of the core and which experience has shown provides integrity of the core both
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 16
6.4.5 EXHIBIT E - Reclamation Plan
laterally and vertically. This process starts in the keyway and continues until the
core reaches ground level. As the core is built the internal slopes are also brought
up to achieve a 3:1 or shallower slope. The exact mix of material used to
construct the core is determined at the time of construction based on the
materials available. Moisture adjustments required have generally been minimal
in prior experience and judgements on additional water are made during
construction to achieve a moisture content typically in an optimum range of 2-4
percent. The internal slopes do not necessarily have to be clay materials, but can
consist of pit run, overburden, shale or a mixture of these materials. The general
approach to construction of the core and regrade of a typical wall at the
extraction limit is shown in the Figure 1 below.
Typical Liner and Regrade for Extraction Limit Wall — Final Reclamation
Topsoil
Unexcavated Perimeter Wall
(slope 1.25H:1V)
Original ground surface
Static Water Level
Sequence
1. In cycles
• Install liner in 6" lifts
• Backfill to 3H:1V
2. Replace topsoil
Regraded slope at 3H:1V
Bedrock
Figure 1: Typical Liner and Regrade for Extraction Limit Wall
Backfill material
2A Backfill Notice is included with this application as an Addendum at the back of
Exhibit E - Reclamation Plan, to facilitate the fill of portions of the extracted lands
for final end -use potentials beyond water storage, which may include residential,
commercial or industrial structures or uses otherwise approved, now or in the
future, by Weld County, Colorado; or a Colorado municipality, as applicable. The
extent and nature of the water storage basin represents the maximum build -out
respective of optimal extraction of commercial product and resulting final slopes.
As part of reclamation, lands situated above the anticipated final water level of
the completed basins, and within 10.0± feet below the anticipated final water
2 Adequacy Item 28: Paragraph removed as proposed post mining land use is lined water storage.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 17
6.4.5 EXHIBIT E - Reclamation Plan
level of the basins, will be graded to 3H:1V, or flatter. Lands below 10.0± feet
from the anticipated final water level of the basins will also be graded to 3H:1V,
or flatter, unless 2H:1V slopes are otherwise approved by subsequent permit
revision. Naturally occurring or previously established slopes may exceed 2H:1V
where not otherwise affected by extraction activities and may not be altered as
part of reclamation unless necessary to facilitate the reclamation of affected
lands.
All affected lands between the extraction limits and remaining above the
anticipated high-water mark of the basins will be capped with a minimum of six
(6.0±) inches of soil, as supported by Exhibit I & J - Soils and Vegetation
Information. Timing and use of soil are detailed further under Exhibit I & J - Soils
and Vegetation Information and Exhibit L - Reclamation Costs. Where compacted
lands exist, and are to be revegetated, those locations will be ripped prior to re -
soil application. There are no known areas of compaction at the time of this
application which would require such activity; and ripping remains a contingency
of the application.
The final land configuration will ultimately result in two (2) reservoir basins
totaling 203.61± surface acres, with a static water elevation surface area of
187.66± acres (refer to Exhibit F: Reclamation Map). The balance of unoccupied
affected lands above the anticipated static water level will be stabilized where
necessary utilizing the seed mixture as shown under Exhibit L - Table L-1:
Primary/Preferred Revegetation Seed Mixture. Lands not otherwise occupied for
developed water resources will be later developed to the highest possible end -use,
and will likely comprise a mixed use which may include other general agricultural
uses as well as light residential, commercial or industrial uses.
The Primary Revegetation Seed Mixture, combines a thoughtful mingling of
predominantly native grasses of diverse height, form, color and function, to
assure that the reclaimed site can provide for a multiple -use benefit. Should
post resource recovery land development be deferred, or even negated, all
affected land remaining above the anticipated final water level of the
resulting ponds will be stabilized with a diverse and durable cover of
predominantly native grasses. This is compatible with, and an improvement
over the diminished lands located in the floodplain of the two rivers, and area
monocultures of residential bluegrass lawns and surrounding cropped land.
;Generally, warm and cool seed mixtures can be treated in a myriad of ways.
In Table L-1 this distinction is indicated in the column labelled "C/W". Cool
season mixtures are often planted in the fall and warm in the spring, however,
3 Adequacy Item 33
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page I8
6.4.5 EXHIBIT E - Reclamation Plan
exceptions may apply. Some argue warm season grasses are better broadcast,
while others like them drilled with the cool season grasses.
Combined with the creation of waterfowl habitat, the baseline reclamation
plan provided for under this submittal will provide less fragmentation of the
area ecology than what may otherwise exist or transpire. As such, the
operation will result in immediate and enduring positive impacts to area
habitat as a long-term beneficial buffer against continued developmental
impacts to the river ecosystem.
Consistent with previous discussions with conservationists from the
Division of Wildlife; operations will result in a desirable establishment
of irregularities for the finished reservoirs. For example: The basin
irregularities will be provided for, both by direct concurrent grading,
post mine landform grading and establishment, and use of fill from
excess or residual materials and reject fines from the operations.
Shallower locations due to variations in site geology may allow for the
creation of other shoreline features through the placement of fill.
Due to the unpredictable nature of the anticipated geology [actual depth of
material and type will vary - extraction and pond depths are approximated
typical maximum extent] and other factors, it is a near misrepresentation to
forecast the final appearance of the ponds, as it creates an unrealistic
expectation in a regulated environment on the minds of various regulating
agents, the general public, and on Operations. Simultaneously, setting false
expectations about the final appearance of the ponds, beyond that already
portrayed, will drain flexibility from Operations essential to the creation of
more desirable effects, while simultaneously exerting pressure for needless
and on- going revisions to the permit. It should be remembered that the
Annual Report to the OMLR will provide a graphic record of this effort.
Since the pace occurs over many years, there is ample time for reflection
and analysis of the effort.
Time and timing will also come into play respective of materials to be used
as fill. The utilization of fill is dependent upon the space available for
deposition over completed areas of extraction in relation to the rate of
creation of reject fines and or other deposit materials. Other influences will
be the attending space for stockpiling, uses, or market conditions for fill
material. Some locations will be more advantageous to fill at a given point
in time than others, and the attending circumstances cannot be reasonably
anticipated. The random nature of this limitation will actually aid in
furthering the establishment of preferred non -geometric patterns of the
finished ponds.
Exhibit F - Reclamation Plan Map, represents the regulated base for which
reclamation must be judged as adequate for release. At the very least, the
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [1121 CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 19
6.4.5 EXHIBIT E - Reclamation Plan
basins delineated under Exhibit F - Reclamation Plan Map, provide desirable
shoreline irregularity and slopes in conformance with existing statutory
requirements. Anything more is a bonus, for everyone, and every
opportunity will be made to take advantage of it, as stated above. Since the
creation of aesthetic effects, edge effect, and other natural landforms,
remain subjective and empirical, the stated intentions and any resulting
efforts to achieve such effects, beyond those identified in the approved
seed mixture and as portrayed in Exhibit F - Reclamation Plan Map, is
commendable, and to be encouraged.
Placement of soil and initial stabilization of affected lands with a
stabilizing cover of grasses will better assure a foundation for later
vertical development and establishment of cover; whether resulting
from natural invasion or direct planning of trees, shrubs, and forbs. By
themselves, the grasses will provide a stable foundation for later
enhancements, while visibly improving wildlife habitat by interrupting area
monocultures. While end use development beyond that already described
cannot be fully determined or detailed at this time, the trend toward
continued residential, commercial and industrial development is self-
evident on surrounding lands.
Although the establishment of native grasses is a primal requirement under
this permit, the incorporation of forbs, shrubs and trees remains at the
discretion of the landowner. Markets and the inherent values of the
landowner to enhance the multiple end use worth of the property will serve
to encourage the vertical development and diversity of the area vegetation
with the contribution of forbs, shrubs, and trees. The purpose is to add
cover, food source for wildlife and pollinators, and stratified creatures that
will come to inhabit and depend upon the natural configuration, character
and extent of the finished landform and diverse stabilizing cover.
It should also be kept in mind that extraction is occurring within an area
formerly occupied by monocultural crops, The cottonwoods along the lower
terrace of the two rivers will be preserved in the majority. A light culling of a
few cottonwoods may occur to assure the integrity of the intended conveyor
line and wash basin; or as needed to assure the protection of personnel. The
riverine areas will otherwise remain untouched, further complementing the
utility of the reclaimed and restored expanse.
Whatever long-term development occurs at the location, and on
surrounding lands, resource recovery and correlated reclamation at this
location will tend to direct human densities away from the two rivers. The
reduced densities will produce direct and indirect long-term wildlife
benefits and diverse multiple end -use potentials involving inherent wetland
development, water resources development, water fowl improvement, and
other desirable effects. The long-term worth of this effect will serve to
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 110
6.4.5 EXHIBIT E - Reclamation Plan
increase the other long-term values for everyone in the area communities
formed by the towns of Evans and Milliken; and greater Weld County.
The final acreage of land remaining for development relative to surface acres
of resulting ponds is illustrated on the following Exhibit F - Reclamation Plan
Map. The map details the post resource recovery land form establishment.
The size of the resulting basins is a function of area geology and available
resource relative to man-made obstructions that serve to prohibit a greater
linkage.
Exhibit F presents Raptor Material's current expectation of the remaining
above -ground and underground structures within the Affected Area at the point
the reclamation of mining related disturbance is complete. Any revisions,
additions, or modifications to this forecast of what may be the outcome of
mining and reclamation operations some 30-35± years from now will be
updated on required Annual Reports, or by Technical Revision, as warranted, or
as otherwise directed consistent with Colorado Statute.
The estimated timetable for extraction, commencing approximately spring to
winter 2023; is estimated to take 23-28± years combined, or longer, followed by
an additional five years to complete reclamation; or a total estimated life of the
mine of 28-33± years; ending approximately winter 2051 to 2056. This is a life of
the mine operation and all timetables are estimates and may prove shorter or
longer than stated. The final determination will occur five years after the deposit
is exhausted and all marketable product has been removed and necessary infill
completed at the location to the point of final reclamation as approved or
modified under the terms of the permit is completed.
'Table E-1 provides a projection of mine development and regrading/reclamation.
The plan as described in Exhibit D and above in this Exhibit E, is a forecast and may
vary according to market conditions with mining and subsequent regrading
occurring faster or slower, sometimes significantly so. The geology may also dictate
changes in the rate of extraction. If efficiency demands in a higher production
demand scenario, separate areas could be developed in the manner described in
Exhibit D simultaneously. Such changes may happen quickly and would be
addressed in the Annual Report.
Miscellaneous considerations:
Fertilizer may be utilized as part of revegetation efforts. The need for
fertilization and any subsequent fertilizer rates will be determined
based upon soil tests taken at the time of reapplication of salvaged soil
4 Adequacy Item 41
5 Adequacy Item 29
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 111
6.4.5 EXHIBIT E - Reclamation Plan
to affected lands remaining above water level. Status of fertilization and
soil test results can be included in OMLR Annual Reports, as warranted.
Refer to Exhibit I - Soils Information.
Weed Control may involve a mix of mechanical or benign vinegar -based
sprays as control methods. A detailed plan to control weeds is described
in Exhibit I/J. Treatment and control of noxious or nuisance weeds will
be reported in OMLR Annual Reports as warranted.
A Backfill Notice follows this page. The flexible use of inert fill will facilitate the
timely reclamation of affected lands.
Continued...next page...
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page X12
6.4.5 EXHIBIT E - Reclamation Plan
'Table E-1 - Two Rivers Mining -Regrading Schedule
Mining -Regrading Schedule Years
Schedule
Area (ac)
1-5 6-10
Area Mined (ac ±)
11-15
16-20 21-25
26-30 31-35
Central Field
Center Section 121.9 50.1 40.0 31.8
North-East Section 15.6 8.2 7.4
West Section 25.1 19.0 6.1
North West Field 41.0 13.6 27.4
Total 203.6 50.1 40.0 40.0 40.0 33.5 0.0 0.0
Central Field
North West Field
Total
Length (ft) Pit wall Created (ft ±)
14,311 4,294 2,800 2,800 2,800 1,617
6,672 1,000 5,672
20,983 4,294 2,800 2,800 3,800 7,289 0 0
Length (ft) Pit wall Regraded (ft ±)
Central Field 14,311 3,200 3,200 3,600 4,311
North West Field 6,672 489 5,400 783
Total 20,983 0 3,200 3,200 3,600 4,800 5,400 783
Length (ft) Pit wall Remaining (ft ±)
Central Field 14,311 4,294 3,894 3,494 2,694 0 0 0
North West Field 6,672 0 0 0 1,000 6,183 783 0
Total 20,983 4,294 3,894 3,494 3,694 6,183 783 0
6 Adequacy Item 29
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 113
6.4.5 EXHIBIT E - Reclamation Plan
BACKFILL NOTICE:
Inert fill may be imported, or utilized from existing on -site sources, to meet or
exceed planned post extraction land use development potentials over the project
area during the life of the operation. The extent and location of fill will be field
determined. All inert materials used for backfilling will be consistent with OMLR
Rules and Regulations, and those of the Colorado Department of Health and
Environment.
All backfill material will be placed with sufficient fines to minimize voids and
settling of backfilled areas and slopes. There are no known or expected acid
forming or toxic producing materials or refuse at this location, nor will materials
known to possess such qualities be knowingly utilized for fill. Any other refuse or
reject materials that do not meet the definition of inert and requiring removal and
disposal will be placed in closed containers and taken to an appropriate landfill for
disposal, unless it is otherwise 'inert,' per Rule 3.1.5(9), of the OMLR Rules and
Regulations.
All materials, whether extracted on -site or imported, will be handled in such a
manner so as to prevent any unauthorized release of pollutants to surface or
ground water resources. All fill will be integrated to meet or exceed the reclamation
plan and correlated end uses authorized under the approved Colorado Office of
Mined Land Reclamation permit.
All fill above the anticipated static water level of the resulting basins will be soiled
and stabilized according to the approved reclamation plan, or as otherwise allowed
according to allowed under this application or locally approved land uses. The
location and extent of fill utilized over extracted lands will be designated in
required OMLR Annual Reports, permit revision, or as part of any request for
release of the permitted area, in part or whole.
I, Garrett C. Varra, hereby attest that the material to be utilized as inert fill in the
area described as the Two Rivers Sand, Gravel and Reservoir Project; is clean and
inert as defined in Rule 1.1(20), of the OMLR Rules and Regulations.
Garrett C. Varra, General Manager
Raptor Materials LLC
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 11
6.4.12 EXHIBIT L - Reclamation Costs
(1) All information necessary to calculate the costs of reclamation must be submitted
and broken down into the various major phases of reclamation. The information
provided by the Operator/Applicant must be sufficient to calculate the cost of
reclamation that would be incurred by the state.
(2) The Office may request the Operator/Applicant to provide additional, reasonable
data to substantiate said Operator/Applicant's estimate of the cost of reclamation
for all Affected Lands.
Summary of Reclamation Costs:
$ 68,138.56±
$ 267,774.46±
$ 82,206.90±
$ 47,920.36±
$ 64,941.76±
$ 14,192.80±
$ 545,174.84±
$ 2,978.00±
$ 548,152.84±
$ 208,632.19±
S ite Discharge
Total Grading per Extraction Front.
Total Liner Construction Expense
Total Re -soiling (inc. Processing area)
Total Re -vegetation Expense (inc. Processing area)
Total Processing Removal Expense
S ub -Total
Mobilization and Demobilization Costs (per DRMS estimate)
$ 756,785.03±
S ub -Total Direct Costs
Indirect Costs based on DRMS Indirect Costs Estimate @ -38.06 %
of Total Reclamation Costs
Grand Total — Financial Warranty Amount — Pending OMLR
Review
EXECUTIVE SUMMARY:
I able 1 - Primary Data on Area of Total Proposed Affected Lands and Reclaimed Features:
Entity
Central
Field
North-West
Field
Combined
Extraction
—
finished
basin (Acres)
162.57
41.04
203.61
Static
Water
Area — surface
(Acres)
151.38
36.28
187.66
Static
Water
Area — elevation
(ft.)
4,673
4,675
Basin
Level
(Acres)
Lands
Above
Static
Water
_
. 1
9
4
.n6
15.95
Basin Area Volume
(cu.yds.)
7,278,366
1,649,937
8,928,303
Static
Water
Level
Volume
(Gallons)
1,470,040,694
333, 244,
376
1, 803, 285, 070
Static
Water
Level
Volume
(Acre
Feet)
4,511.4
1,022.7
5,534.1
Plant
Processing Area (Acres)
18.40
Wash
Pond
Area (Acres)
5.80
Lands
(Acres:
Above
Static
Water
37.31
Total
Level
NOTE Well: All lands within the 409.234± acre permit area are considered as affected
lands under C.R.S. 34-32.5-103(1) respective of this permit application and any
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page (2
6.4.12 EXHIBIT L - Reclamation Costs
subsequent permit revisions or amendments to the permit as originally approved.
Previously affected ground prior to on -set of Operations under this permit will not be
reclaimed under the terms of this permit unless otherwise re -affected beyond their
original state. Public Lands and other easements and Right -of -Ways are offset from
operations and while they may fall within the 409.234± acre parcel — are excepted from
the permit conditions to the extent of their approved setbacks.
Technical Revision 1: This version of Exhibit L incorporates changes to the site layout
and mining plan in the Two Rivers Technical Revision 1 ("P124 TR01") that resulted in
changes to the financial warranty: 1) the relocation of the processing area and the
wash pond to between the Big Thompson and South Platte Rivers, which eliminated the
need for a conveyor, and 2) a revision of the mining plan from excavation around a
retained core to a southwest -to -northeast advancing highwall.
Additionally, as part of the P124 TR01 submittal, adjustments were made to the
financial warranty calculation methods in order to align more closely with DRMS's
CIRCES cost estimating methodology, as summarized in the Division's reclamation cost
estimate for the Two Rivers Sand, Gravel, and Reservoir Project, dated March 24, 2023.
Substantial increases in certain unit costs provided in DRMS's estimate resulted in larger
total costs in the P124 TR01 revised financial warranty submittal.
During the course of the preparation of this second adequacy response, inconsistencies,
identified by the DRMS in this letter, were observed between the map exhibits and the
reported quantities. The map exhibits are based on the site mining plan and are the
primary source for project quantities; therefore, the quantities in the report Exhibit L,
and the resulting financial warranty estimate, have been updated to align with the
quantities shown in the map exhibits.
Finally, the number of significant digits presented in this Exhibit often exceeds the
possible measurement accuracy and may not be appropriate for the scale of works
presented. However, to maintain consistency with previous versions of this Exhibit, the
number of significant digits presented has not been changed. Slight differences in
calculated quantities may be observed due to rounding errors and an over-
representation of accuracy due to these significant digits.
A summary of the principal changes resulting from the revised mining plan and revised
calculation approach, with corrected quantities, is outlined below:
1. Associated with the revised mining approach from a retained core to an
advancing highwall, the initial extraction area was increased from 40 acres to
50.11 acres. The initial extraction area referred to in Exhibit L is intended to
address the work anticipated to be completed in the first five years of the life of
mine. The 70.21 acres of "initial extraction" referred to in the original
application's Exhibit L refers to the entirety of the contiguous horseshoe -shaped
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [1121 CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 13
6.4.12 EXHIBIT L - Reclamation Costs
extraction initially proposed and includes 30.21 acres in addition to the 40 acres
originally proposed to be extracted in the first five years of mine operations. The
change in excavation geometry from a horseshoe -shape to a trapezoidal shape
has resulted in a larger initial excavated area and a decrease in initial excavation
perimeter, from 6,200 feet to 6,176 feet. Additionally, the 4,610 feet of core
perimeter wall is no longer applicable. The increase in excavation area and
decrease in perimeter length is associated with the following changes to the
originally approved reclamation cost estimate:\
a. Increased dewatering costs due to a larger excavation volume;
b. Increased grading costs due to the addition of a soil compaction cost and
higher unit costs;
c. Decreased liner construction costs due to lower unit costs and elimination
of the liner on a core wall;
d. Increased re -soiling and revegetation costs due to increased unit costs;
e. Decreased structure removal costs due to the elimination of the conveyor
belt; and
f. Decreased mobilization costs, based on DRMS's estimate.
2. The relocated plant processing area and wash pond are associated with
increases in area from 15.76 acres to 18.4 acres, and 5.6 acres to 5.8 acres,
respectively. The increase in exposed area is associated with the following
changes to the originally approved reclamation cost estimate:
a. Increased re -soiling and revegetation costs due to increased unit costs.
The following estimates utilize assumptions based upon the pre -disturbed state of the
application for purposes of determining estimated costs of reclamation and correlated
financial warranty. Where appropriate, information is generalized and approximated
from similar estimates determined by the Colorado Office of Mined Land Reclamation
(OMLR), as indicated.
RECLAMATION EXPOSURE:
Based upon the Extraction and Reclamation Plans of this application, the status and trend
of activities and affected land; and related calculations to estimate reclamation liability,
are determined as follows.
Please Note: Due to the difficulty of calculating heavy equipment costs similar to the
Division's software program, unit costs from previous and reasonably current Division
estimates of like or similar kind have been utilized to create a reasonably close estimate.
The per unit basis from Division records are shown along with other sources used or
referenced to determine unit costs, at the back of this exhibit.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 14
6.4.12 EXHIBIT L - Reclamation Costs
METHOD OF EXTRACTION:
Before concurrent grading, resoiling, and revegetation for reclamation can commence, a
perimeter keyway (dewatering trench') must first circumnavigate the area where the
perimeter slopes form along the extraction limits. For Two Rivers, this includes four
sequential areas of extraction:
• 121.86± Acres - Central Field — Center Section
• 15.58± Acres - Central Field — North-East Section
• 25.09± Acres - Central Field - West Section
• 41.04± Acres - North-West Field
Exhibit L: Financial Warranty Map, shows Initial Extraction will begin in the northwest
corner of the yellow hatch area shown on the Exhibit L Map. The direction of extraction
will first progress southward, following the perimeter of the extraction limits in order to
establish the western perimeter keyway for the 121.86± acre Center Section of Central
Field. An advancing front will then be pushed eastward as extraction progresses. The
initial extraction area comprises approximately 50.11± acres and will leave approximately
71.75± acres that may be extracted as needed as keyway drainage capacity allows.
The initial extraction area is bordered to the South adjacent to a near 800± foot section
of oil and gas line that is pending removal; along with the two oil and gas wells, also
pending removal (refer to Exhibit C for ownership details). Extraction will not occur within
10 feet of these lines, or 25 feet from the wells, as indicated in the setbacks detailed under
Exhibit D: Extraction Plan. Below this gas line is an existing pond and well that will be
used as a Settling Basin Area, containing at present a solitary settling basin and pump as
a point of discharge of groundwater. This pond may be expanded or added to below this
line.
Perimeter Keyway Extraction will maintain a perimeter slope no steeper than 1.25H:1V,
:1V,
except for the perimeter shown in red along it's extraction limit, and respective toe where
cut slopes will not exceed 2.OOH:1V; as indicated (refer to Exhibit S: Stability Analysis for
additional information). At the toe of the cut perimeter slope is the keyway that runs
below the extracted deposit of the basin, into the bedrock, which allows the subsurface
waters to flow to the settling basin and discharge pumps necessary to keep the cut basin
dry during a time of extraction and reclamation of the affected perimeter slopes.
The keyway dimensions may vary more or less from 4± to 8± feet in depth and 4± to
16± feet in width. Extraction must be broad enough to allow equipment to safely
approach the toe and excise the bed dimensions where the resulting channel is sufficient
to convey the groundwaters to the settling basin for discharge.
'Adequacy Item 15: Keyway clarification
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 15
6.4.12 EXHIBIT L - Reclamation Costs
Please Note: The graphic representation of the Perimeter Keyway Extraction is
idealized, and may vary in shape and size presented. Annual Reports will report on the
nature and extent of affected lands and more properly reflect actual conditions on the
ground in a given year of operations.
UNITS OF DISTURBANCE:
The life of the operation is based upon a base rate of extraction approximating 8.0± acres
of disturbance in a given year. This time will pulse with the market and may average 8.0±
acres, but could be faster or slower. Starting out, initial warranty necessary to cover the
costs of reclamation for the extent of disturbance in a given year will also vary in time and
circumstance, as the initial disturbance is generally less at the onset. So, a rate of
disturbance can be estimated and the warranty adjusted incrementally with time and
circumstance.
Starting out in the initial projected 5 years of Operations, and incrementally thereafter,
necessary warranty can be estimated and adjusted in incremental Units based upon the
projected Life of the Operation. Essentially, a 28-33± year Life of Operations assumes a
rate of extraction of approximately 8.0± acres per year.
Considering the Mining -Regrading Schedule included as Table E-1 in Exhibit E, and the
general development concept shown on Exhibit L: Financial Warranty Map, Raptor
estimates for the initial 5 -year period, development of an initial 50.11 -acre excavation in
the Center Section of Central Field will result in creation of approximately 4,294 feet of
external perimeter pit wall, and 1,882 feet of advancing highwall along the eastern edge
of the initial excavation area, for a total of 6,176 feet of pit wall. No reclamation or lining
is anticipated in the initial 5 -year period.
Raptor estimates for Financial Warranty purposes an approximately 2,089 -foot wall
excavated at 2H:1V and a 4,087 -foot wall at 1.25H:1V slopes.
It is important to note that the financial warranty estimates the closure cost of the
operation at the end of the expected first 5 -year period. It is assumed in this initial estimate
that no reclamation activities (regrading, lining, topsoiling) will take place. The cost
estimate then reflects reclaiming the projected excavation at that point in time. The actual
extents and shape of the excavation may change, and actual progress will be addressed
in the annual reports.
Raptor will update this Exhibit L, the reclamation cost estimate, and any other exhibits as
required for purposes of determining financial warranty prior to disturbance reaching the
limits projected in the initial 5 years of Operations as described in this Exhibit and shown
conceptually on Exhibit maps C-2 and L.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 16
6.4.12 EXHIBIT L - Reclamation Costs
In the following breakdown of components for estimating reclamation cost, factoring of
the 5 -year projected disturbance against the final pits is used where appropriate to obtain
a reasonable estimate of work required. Various approaches to obtain the necessary
quantities exist, but Raptor believes the approaches and quantities are reasonable and
alternate approaches would be no more certain as to the accuracy obtained. This is simply
due to the variable nature of the deposit and the need to field fit the excavation to ensure
safety in the conditions encountered.
DEWATERING:
Raptor assumes that the pit would be in an unlined state and if operations had ceased,
would recharge to static water level requiring dewatering of the pit to allow reclamation
operations to be completed.
95 hp. 2,800 gal./min./pump x (up to) 5 pumps @ 24 hours/day
Volumes: The estimated volume of water within the pit was determined using a surface
volume calculation in a 3D CAD program with a surface water surface elevation of 4,673
feet above mean sea level.
For the initial 5 -year excavation: 434,529,979± gallons
Total Cost for initial 50.11± acres of Discharge = 434,529,979± gallons x $ 0.000131/gal.
discharge.
$ 56,923.43 -Initial Discharge Cost for 50.11± acres
It is assumed that ongoing dewatering will be required during reclamation of the pit and
Raptor has allowed for 30 days once the pit has been dewatered.
The estimated inflow rate to the fully excavated pits has been estimated at 15,190,000
gallons/day. The estimate is based on modeling of the groundwater by AWES in support
of Exhibit G: Water Information. A memo summarizing the basis of the estimate is
attached as a new addendum. The initial 50.11 -acre excavation area represents
approximately 24.61% of total extraction area (203.61 acres). Total discharge to maintain
dry conditions for reclamation then is:
15,190,000 gallons/day x 24.61% x 30 days = 112,151,304± gallons
Cost for 30 working days of Discharge = 112,151,304± gallons x $ 0.0001/gal. discharge
(rate taken from the DRMS March 23, 2023 Reclamation Cost Estimate for Two Rivers.)
$ 11,215.13 30 days Dewatering Cost for 50.11± acres
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page I7
6.4.12 EXHIBIT L - Reclamation Costs
$ 68,138.56 Total Dewatering Cost for 50.11± acres
Please Note: 2The basins will be lined or otherwise segregated from the area
groundwater, in order to liberate the water otherwise retained to supplement loss from
evaporation in the unlined state.
GRADING:
As stated above, Raptor conservatively estimates for Financial Warranty purposes an
approximately 2,089 -foot wall excavated at 2H:1V and a 4,087 -foot wall at 1.25:1V slopes
along the extraction limits flanking WCR 396; and 2H:1V along the South Platte River
levee, as shown on Exhibit D: Extraction Plan, and Exhibit L: Financial Warranty Map.
Actual volume of fill required to grade at 3H:1V for a respective cut slope is determined
in the graphics, below. Square Foot volume of backfill x linear feet of slope divided by
27 will yield the required cubic yards needed for each section of highwall. A rate per
Loose Cubic Yard of fill taken from the previously approved values determined by the
OMLR, is used to better ensure the integrity of the resulting values.
D
C; H A ivi
40.0'±
depth
4
O
Sim
el. .--�
r
Int
3H:1V
FINISHED
CPACF
FILL TO GRADE = 800 SOFT.
2 Adequacy Item 28
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 18
6.4.12 EXHIBIT L - Reclamation Costs
DIAGRAM 7:
40.0'±
depth
311: 1V
FINISHE
GRADE.
tic *
D
FILL TO GRADE - 1,400 SQ. FT
Hauls are expected to be very short, excavating material from the adjacent unexcavated
area and placed on the exterior walls to establish the required grades. It is estimated that
there would be 1,882 feet of advancing wall and side slopes in addition to the 4,294 -foot
extraction limit wall. Due to the very short hauls it may only require a wheel loader
operating in load/carry/dump mode with a supporting Tracked Dozer. At most, the
method of fill will utilize one (1) Excavator/Loader, two (2) Haul Trucks, together with a
supporting Tracked Dozer and one (1) Sheep's Foot Compactor. The concept for
establishing the regraded slopes for financial warranty purposes is shown in the following
figure.
NW FIELD =
41.04± ACRES
I. LIA
1
:AL FIELD
SECTION
SW WASH POND
- 58 ACRES
RdiT+AL
AREA OF
EXTRACTION
GENERAL LINING PROGRESSION
NOTE ThE EXTRACTION AREA SIZE.
SHAPE, AND FACE ORIENTATION MAY
VARY FROM THAT PORTRAYED
DEPENDING ON FIELD CONDITIONS.
GENERAL MINING PROGRESSION
SETTLING BASIN
INY
CENTRAL FIELD
= 162.57± ACRES
CENTRAL FIELD
CENTRAL SECTION
Approach to regrading interior and extraction limit slopes for financial warranty purposes.
2N:1 V CUT S&C1
I
1
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 19
6.4.12 EXHIBIT L - Reclamation Costs
Assuming a mean depth of advancing cut of 1.25H:1V at the extraction limits of 40.0±
feet depth:
4,087± lin.ft. (extraction limit) x 1,400.00± sq.ft. (required fill — Diagram 1, above) =
211,919± LCY
211,919± LCY
x $ 0.947± per LCY.
$ 200,686.84± fill along a 4,087 -foot extraction limit cut at 1.25H:1V.
Assuming a mean depth of advancing cut of 2H:1V at the extraction limits of 40.0± feet
depth:
2,089± lin.ft. (extraction limit) x 800.00± sq.ft. (required fill — Diagram 1, above) =
61,896+ LCY
61,896± LCY
x $ 0.947± per LCY.
$ 58,615.79 Sub Total -Grading to 3H:1V along a 2,131 -foot extraction limit cut at 2H:1V
To compact the fill required for regrading, a total volume of 211,919 LCY + 61,896 LCY
= 273,815 LCY is considered with a 0.91 shrinkage factor, for a total of 249,171
compacted cubic yards (CCY).
249,171 CCY
x $ 0.034± per CCY.
$ 8,471.83 Sub Total -Compacting fill above the length of the entire liner (6,176 linear ft)
$ 200,686.84 Sub Total -Grading to 3H:1V along a 4,087 -foot extraction limit cut at
1.25H:1V.
+ $ 58,615.79 Sub Total -Grading to 3H:1V along a 2,089 -foot extraction limit cut at
2H:1V.
+ $ 8,471.83 Sub Total- Compacting fill above the length of the entire liner
$267,774.46± Total — Initial Grading.
Liner Installation:
Raptor has made allowance for liner installation on the regraded slope. Assumptions are
that a 4 -foot -thick liner will be keyed into bedrock at the base of the regraded slope and
up the slope to approximately 5 -foot below the original surface elevation. The keyway
dimensions in bedrock are assumed to be 4x4 -foot.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 110
(slope 1.25H:1V)
6.4.12 EXHIBIT L - Reclamation Costs
For the exterior walls at extraction limits, the regrade and liner installation is as described
in Exhibit E. Typical liner installation as described previously in Exhibit E is shown in the
following figure. The volume of liner material required will vary according to the slope of
the wall the liner is installed on. The volume of liner material is conservatively estimated
based on the perimeter length at the top of the liner.
Typical Liner and Regrade for Extraction Limit Wall — Final Reclamation
Topsoil
• _
Unexcavated Perimeter Wall
•
40.
•,j4.;• ••••••!•
••i •F•1 • • ••• ••f •)•t• 1 • ♦ . ••
) ♦ • . e, . ♦ ) • • • • ♦ 1• • • • • • ♦ • • ••c••••••• .•.••
•t•••••i•
...•••••i •••••••
••••• •1 ••••
a f • ) • • • f 11 • ) 1 s,l•1 ! • • • 1 ) 1, • 1. • • •••.'•i •.•,`.•e• •• .• • 1,••i.•.•• • ) • • •. •.• • •
••••••••• . • a ♦ • • • • ♦ . 1 • 1 • • • • • • ) • • • •1 , • • 1 • • • • • .•• • •• • I•
1 • • • • 1 • • • 1 • • • 1 . • • 1 • ♦ 1 ♦ r • t e•• ••• t e • t 1 • 1 • • • • • ♦ J • t •) • ) •
• • • &•49i l t
Original ground surface
Static Water Level
Sequence
1. In cycles
• Install liner in 6" lifts
• Backfill to 3H:1V
2. Replace topsoil
Regraded slope at 3H:1V
Typical Liner and Regrade for Extraction Limit Wall
era
Backfill material
Raptor conservatively estimates for Financial Warranty purposes an approximately 2,089 -
foot wall excavated at 2H:1V, a 4,087 -foot wall at 1.25:1V slopes. The average length of
slope to be regraded is proportional to the length of the initial excavation occupied by
1:25H:1V slopes (66.2%) and 2H:1V slopes (33.8%): 0.662 x 56 ft + 0.338 x 78 ft =
63.4 ft.
The total cost of installing the liner includes grading the slope under the liner, hauling
liner material to the pit area, mixing the liner material, and compacting the liner. Assume
that half of the total liner material will need to be mixed.
Grade Slope under Liner
Cost: (6,176 lin.ft. x 63.4 ft. x 1ft. depth)/27 x 1.215 (swell factor) x $0.425/LCY =
$7,493.44.
Haul Liner Material to Pit Area
Vol (liner): (6,176 lin.ft. x 63.4 ft x 4 ft depth)/27 x 1.00 (swell factor) = 58,047 CY
Vol (keyway): (6,200 lin.ft. x 16 sq.ft.)/27 x 1.00 (swell factor) = 3,660 CY
Vol total: 58,047 CY + 3,660 CY = 61,706 CY
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page X11
6.4.12 EXHIBIT L - Reclamation Costs
Cost: 61,706 CY x $0.947/CY = $58,435.93
Mix Material for Liner
Vol (mixed): 61,706 CY / 2 = 30,853 CY
Cost: 30,853 CY x 1.215 (swell factor) x $0.232/LCY = $8,696.90
Compact Liner
Cost: 61,706 CY x 0.91 (shrinkage factor) x $0.135/CCY = $7,580.63
$ 82,206.90 Total Liner Installation Cost
NOTE: This is a conservative approach to the estimation of reclamation cost for financial
warranty at the projected 5 -year disturbance. The distance of 2H:1V wall is maximized
which has a higher lining cost than wall at 1.25H:1 V. Also, if sufficient backfill material
were available or accessible on site from either topsoil or overburden material in
temporary stockpiles, or readily accessible from bedrock exposed, backfilling all the
slopes with available material and installing the liner in typical fashion as described in
Exhibit E would be significantly less expensive.
Soil Demand AND Re -soiling of Affected Lands (refer to Exhibit D):
In the mined area, soil demand is limited to the cut basin slopes remaining above the
static water level. For Central Field, the total area above the anticipated static water level
of the basins is 11.19 ± acres. Additionally, the areas disturbed in the Materials Processing
Area and the Wash Pond will require re -soiling and revegetation. We conservatively
estimate that the entirety of the Materials Processing Area (18.4 acres) and the Wash
Pond (5.8 acres) will require re -soiling for the purpose of this Financial Warranty.
To estimate the area involved in resoiling the Center Section of Central Field — we'll use
a percentage of the total perimeter length of the extraction limits involved:
14,311 Total perimeter length Central Field
4,294 External perimeter length Center —Central Field —extraction limits
+1,882 Internal perimeter length along advancing front
6,176 Combined perimeter length
6,176 . 14,311 = 43%
11.19 acres x 43% = 4.83± acres requiring resoiling and revegetation (see Establishment
of Vegetation over Affected Lands, below).
At a depth of 0.5± feet, total volume = 4.83± acres x 0.5± feet of soil replacement, is:
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [1121 CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page X12
6.4.12 EXHIBIT L - Reclamation Costs
4.83± acres x 43,560.0± sq.ft./acre : 27 cu.ft./cu.yd. x 0.5' depth = 3,895± cu.yds..
The majority of soil placement can occur using the average placement distance of 600
ft., or less along embankments, (utilizing the same assumptions utilized at either Kurtz
or Heintzelman Projects).
The cost to haul the topsoil to the pit area is:
3,895± cu.yds of soil demand
x $ 0.947 per LCY.
$ 3,689.02± to replace 0.5± feet of soil over the existing affected lands remaining
above the anticipated final water level at the Center of Central Field along
the perimeter cut slopes at the extraction limits.
The cost to spread the topsoil along the pond bank is:
3,895± cu.yds of topsoil x 1.215 (swell factor) = 4,733 CY
x $ 0.257 per LCY.
$ 1,216.38± to spread the topsoil along the disturbed banks of the pond at the
extraction limits above the final water surface elevation.
Similar calculations can be performed for re -soiling the Materials Processing Area and the
Wash Pond:
For a total area of 24.2 acres, 0.5 ft of topsoil will be required for a total topsoil volume
of 24.2 acres x 0.5 ft depth x 43,560 sq.ft./acre / 27 x = 19,521 CY
The cost to haul topsoil to the Materials Processing Area and Wash Pond:
19,521± cu.yds of soil demand
x $ 1.191 per LCY.
8
23,249.91+
The cost to spread topsoil on the Materials Processing Area and Wash Pond:
19,521± cu.yds of topsoil x 1.215 (swell factor) = 23,718 CY
x $ 0.232 per LCY.
$ 5,502.67±
Ripping will be required in the Materials Processing Area and the Wash Pond due to
compaction by heavy machinery during operations; the slopes of the Center Section of
the Central Field are not anticipated to require ripping due to relatively recent disturbance
and no compaction.
24.2 acres
x $ 589.34/acre
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page X13
6.4.12 EXHIBIT L - Reclamation Costs
$ 14,262.37±
$ 47,920.36± Total Soil Replacement Cost for the Initial Extraction Area of the Central
Field, the Materials Processing Area, and the Wash Pond.
Establishment of Vegetation over Affected Lands:
The demand establishment of vegetation over the affected lands will also diminish
proportionately with the planned extraction of the Tracts. For now, the total exposure is
estimated as indicated above to be 4.83± acres for the Center Section of Central Field
and 24.2 acres for the Materials Processing Area and Wash Pond (see Soil Demand) :
NOTE: The cost for seed is equal to the price provided in the 2023 Reclamation Cost
Estimate for the Two Rivers Sand, Gravel, and Reservoir Project, which includes the cost
of seed application; however, the costs are known to fluctuate seasonally — and are
estimates based on prior seasons. The seed mixture includes a substitute for mulch in
the inclusion of a wheatgrass hybrid. The Division has historically agreed with and
approved the inclusion of this hybrid as a substitute for mulch. The Optional Seed Mix
will be used if the Primary Mixture fails, but costs less, so that cost is accounted for.
These costs are as follows:
$ 1,789.70/acre± Preferred Seed Mix
x 4.83± acres
$ 8,642.66± Sub -Total Seed and Application
Assume a 25± percent failure rate, and add this expense back into the total for reseeding,
or
$ 2,161+ Sub -Total Re -seeding costs
$ 10,803.33± Excavation Area Re -vegetation Expense
Re -vegetation of the 24.2 -acre processing area and wash pond is also estimated.
$ 1,789.70/acre ± Preferred Seed Mix
x 24.2± acres
$ 43,310.74± Sub -Total Seed
Assume a 25± percent failure rate, and add this expense back into the total for reseeding,
or
$ 10,828± Sub -Total Re -seeding costs
$ 54,138.43± Processing Area Re -vegetation Expense
$ 64,941.76 Total Re -vegetation Cost
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page X14
6.4.12 EXHIBIT L - Reclamation Costs
Processing Area Decommissioning:
Raptor has estimated decommissioning costs for the Processing Area. All plant and
equipment in the processing area is portable and would have more value than the cost
of loading and removing it.
Decommissioning will involve the removal of concrete pads for processing equipment and
concrete supports for truck scales and temporary buildings.
Three 12 -inch -thick concrete pads are assumed in the processing area with dimensions
15- x 30 -feet, 15- x 60 -feet, and 15- x 25 -feet. Demolition and removal costs are
estimated at $2.30/sq.ft. for 12" concrete pads.
The truck scale will have concrete supports with an estimated volume of 10 CY.
Additionally temporary buildings for the scale house/site entrance area and processing
area will have concrete support blocks with estimated at 8 CY of concrete. Estimated
costs for the concrete supports is $6.89/lin.IL (of ift thick, 1 yd deep concrete slab).
Concrete pads: 1,725 sq.ft. x $2.30/sq.ft. = $ 3,962.33
Concrete supports: 18 CY x 9 lin.ft/CY x $6.89/LF = $ 1,116.18
The removal of two 6,000 to 8,000 -gallon fuel tanks located on -site for vehicle refueling
is estimated to cost $5,416.35 each, for a total of $10,832.70.
$3,962.33 Sub -Total Concrete Pads Removal
+ $1,116.18 Sub -Total Concrete Supports Removal
+ $10,832.70 Sub -Total Fuel Tank Removal
$15,911.21 Total Unadjusted Decommissioning Cost
Applying a location adjustment of 0.892 (as per the March 2023 DRMS Cost Estimate for
Two Rivers):
$ 14,192.80 Total Process Area Decommissioning
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [1121 CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page X15
6.4.12 EXHIBIT L - Reclamation Costs
OTHER MISCELLANEOUS COSTS:
Mobilization and demobilization costs are based upon the Division's estimates, which were
provided in their March 24, 2023 estimate at $2,978.
Demolition of Structures:
None. Building Permits for structures will be obtain where required from the Weld
County Building Department.
Please Note: Since there is no possibility of the applicant in fully reproducing
the Division's methods, utilizing similarities from past OMLR calculations is the
most viable and accurate means available for the applicant to derive
reasonable estimates of per unit costs and should result in estimates very
reliable with that of the Division.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT SEPTEMBER 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Monday, July 1, 2024
To: Weld County Clerk to Board
1150 O Street
Greeley, CO 80632
From: Garrett C. Varra
Raptor Materials, LLC.
8120 Gage Street
Frederick, CO 80516
Subject: Technical Revision #1 - Materials Processing Area and Wash Pond Relocation,
Conveyor Removal
Parcel 124 -Two Rivers Sand, Gravel, and Reservoir Project
DRMS Permit M-2022-013
The following materials shall be submitted to the Colorado Division of Mining, Reclamation, and
Safety (DRMS) for placement for public review:
• Correspondence of July 1, 2024 from Raptor Materials, LLC. To the Colorado Division of
Mining, Reclamation, and Safety, with attending attachments.
Attachments:
• Proof of Placement —Weld County Clerk to the Board
• Text Exhibits (Revised 5/29/2024): Exhibit D - Mining Plan, Exhibit E - Reclamation Plan,
Exhibit L- Financial Warranty
• Map Exhibits (Revised 5/29/2024): Exhibit C2 — Extraction Plan, Exhibit F — Reclamation
Plan, Exhibit I -J — Soils & Vegetation, Exhibit L — Financial Warranty
• Floodplain Development Permit Approval
Your signature below acknowledges receipt of the above -referenced material, as attached. The
material should be added to the above -referenced Application, as originally submitted to the Weld
County Clerk to the Board and made accessible for public review.
Received on:
RECEIVED
JUL 012024
WELD COUNTY
COMMISSIONERS
By:
Office of the Weld County Clerk to the Board of County Commissioners
-11'017_4
Z0Z3-0857.
Monday, July 1, 2024
To:
From:
Subject:
Rob Zuber, E.P.S.
Colorado Division of Mining, Reclamation, and Safety
1313 Sherman Street, Room 215
Denver, CO 80203
Garrett C. Varra
Raptor Materials, LLC.
8120 Gage Street
Frederick, CO 80516
Technical Revision #1 - Materials Processing Area and Wash Pond Relocation,
Conveyor Removal
Parcel 124 -Two Rivers Sand, Gravel, and Reservoir Project
DRMS Permit M-2022-013
Mr. Zuber,
This Technical Revision addresses the relocation of the Materials Processing Area and the Wash
Pond and the removal of the conveyor for the Parcel 124 project, as well as additional
modifications to the extracted areas within said permit boundary.
The following modifications to the project area are included in this Technical Revision:
Relocation of the Material Processing Area from its original proposed location north of the
Big Thompson River to the revised location in the northern portion of the Central Field —
West Section. The revised location has an associated increase in area from 15.76 acres to
18.4 acres;
Relocation of the Wash Pond from its original proposed location north of the Big Thompson
River to the revised location between the Central Field -West Section and the South Platte
River. The revised location has an associated increase in area from 5.6 acres to 5.8 acres;
Removal of the proposed conveyor, as extracted material will no longer need to be
transported across the Big Thompson River for processing; and
Revision of the initial area of extraction to reflect the proposed advancing wall that will
begin in the northwest corner of the Central Field - Central Section and advance north-
eastward. The revised initial extraction area has an associated increase in area from 40.0
acres to 51.1 acres.
An updated financial warranty estimate is included based on the above -stated revisions.
Additionally, the Floodplain Development Permit has been formally approved by the City of Evans
as of May 29, 2024, and is included as an attachment.
Attachments: Technical Revision Cover Sheet
Proof of Placement -Weld County Clerk to the Board
Exhibit C2 - Extraction Plan Map
Exhibit D - Mining Plan
Exhibit E - Reclamation Plan
Exhibit G - Water_Resources Map
Exhibit I -J -Soil &Vegetation Map
Exhibit L— Financial Warranty Cost Estimate and Map
Floodplain Development Permit Approval
Page II.
6.4.4 EXHIBIT D — Extraction Plan
The mining plan shall supply the following information, correlated with the affected
lands, map(s) and timetables:
(a)description of the method(s) of mining to be employed in each stage of the operation
as related to any surface disturbance on affected lands;
(b)earthmoving;
(c)all water diversions and impoundments; and
(d)the size of area(s) to be worked at any one time.
(e)An approximate timetable to describe the mining operation. The timetable is for the
purpose of establishing the relationship between mining and reclamation during
the different phases of a mining operation. An Operator/Applicant shall not be
required to meet specific dates for initiation, or completion of mining in a phase
as may be identified in the timetable. This does not exempt an
Operator/Applicant from complying with the performance standards of Rule 3.1. If
the operation is intended to be an intermittent operation as defined in Section 34-
32.5-103(11)(b), C.R.S., the Applicant should include in this exhibit a statement
that conforms to the provisions of Section 34-32.5-103(11)(b), C.R.S. Such
timetable should include:
(i)an estimate of the periods of time which will be required for the various stages
or phases of the operation;
(ii)a description of the size and location of each area to be worked during each
phase; and
(iii)outlining the sequence in which each stage or phase of the operation will be
carried out. (Timetables need not be separate and distinct from the
mining plan, but may be incorporated therein.)
(f)A map (in Exhibit C - Pre -Mining and Mining Plan Maps(s) of Affected
Lands, Rule 6.4.3) may be used along with a narrative to present the following
information:
(i)nature, depth and thickness of the deposit to be mined and the thickness and
type of overburden to be removed (may be marked "CONFIDENTIAL,"
pursuant to Rule 1.3(3)); and
(ii)nature of the stratum immediately beneath the material to be mined in
sedimentary deposits.
(g)Identify the primary and secondary commodities to be mined/extracted and describe
the intended use; and
(h)name and describe the intended use of all expected incidental products to be
mined/extracted by the proposed operation.
(i)Specify if explosives will be used in conjunction with the mining (or reclamation). In
consultation with the Office, the Applicant must demonstrate pursuant
to Rule 6.5(4), Geotechnical Stability Exhibit, that off -site areas will not be
adversely affected by blasting.
(j) Specify the dimensions of any existing or proposed roads that will be used for the
mining operation. Describe any improvements necessary on existing roads and
the specifications to be used in the construction of new roads. New or improved
roads must be included as part of the affected lands and permitted acreage.
Affected land shall not include off -site roads which existed prior to the date on
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 12
6.4.4 EXHIBIT D — Extraction Plan
which notice was given or permit application was made to the office and which
were constructed for purposes unrelated to the proposed mining operation and
which will not be substantially upgraded to support the mining operation.
Describe any associated drainage and runoff conveyance structures to include
sufficient information to evaluate structure sizing.
Prologue: Extraction of natural resources for rock products is essential to the
well-being of a community. The urban infrastructure served by development of
construction materials is a local and transitional benefit. The more remote
these resources are from the need, the greater the cost to the private and public
community. Unlike fixed urban impacts to the landform and area ecosystems,
reclamation and restoration of extracted lands allow for preservation of natural
buffers, and complementary alteration of both natural and human systems.
Commencing on the family farm in 1948, the Varra family combines nearly
73± years of operational experience that serves as testimony to a history of
sound and thoughtfully executed operations of this kind. For the Two Rivers
Sand Gravel and Reservoir Project, lands not otherwise occupied for Developed
Water Resources will be improved to the highest possible end -use. Post
Extraction Uses beyond the Primary Use of Developed Water Resources will
likely comprise continuing and diverse general agricultural uses; as well as
possible light residential, commercial, or industrial uses; as determined by
right, or as otherwise authorized by the governing authority.
The restoration of above ground lands to native grasses and attending large
water bodies are a baseline asset to area wildlife terrestrials and avifauna.
Beyond good will, there are continuing landowner philosophical and economic
enticements to further benefit area wildlife populations and diversity to further
the value and enjoyment of the modified and surrounding lands. These efforts
laid down over time involve the considerable experience of the landowner, staff,
and other resources, including periodic consultation with the Colorado Division
of Wildlife, the U.S. Natural Resources and Conservation Service, Colorado State
University Natural Resource Departments and Extension Service, and a
multitude of other natural resource professionals; including those highly
qualified organizations and professionals who have already contributed to the
Exhibits included under this application.
Setting: The project area lies along and within the flood plain of the South
Platte and Big Thompson Rivers. The predominant location of extraction is
proximal to the geological delta found near the existing confluence of the two
rivers (hence, the Two Rivers Sand Gravel and Reservoir Project (Two Rivers
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 13
6.4.4 EXHIBIT D — Extraction Plan
Project; or TRP); and overlies bedrock that varies in depths as shallow as 20±
feet in some locations, and more commonly 30-45± feet in depth from the
surface.
The permit area is flanked on its immediate western boundary by agricultural
operations. To the north, residential uses expand, as remnant agriculture
clings to the rising ground. Unfettered agricultural and rangeland uses still
thrive as they extend beyond the permit boundary east, west, and south of the
permit boundary along the alluvial influences of the two rivers. To the
immediate east of the TRP, riverine lands are under active transformation into a
created wetland bank. It should be understood that agricultural practices will
remain active over the project area until converted by resource recovery and
reclamation.
America's first Transcontinental Railroad was being discussed in the 1840's,
and surveyed in the 1850's. The railroads began the transformation of the
American West on 10 May 1869 at Promontory Point, Utah. Railroad routes
were being planned for this location and surrounding lands likely soon after
the end of America's Civil War. The lines planned over the Two Rivers parcels
were never built. Other lines were built nearby, like the Union Pacific's Dent
line, that runs parallel to this day along the south bank of the South Platte
River; and below the TRP.
With area railroads came increased settlement, and with population the nature
of the landscape became modified to complement growing market economies
of agriculture and commerce since the early 1870's. We estimate the lands
hugging the two rivers were farmed and the topography gradually manipulated
for agriculture following the early establishment of Greeley and LaSalle,
Colorado; in 1869-70.
Area crops are commonly in corn, but this has not always been the case. We
postulate that near the onset of the Twentieth Century sugar beet farming
began to feed the demand of area sugar beet mills, further evidenced by
speculative railroad routes over and near the parcel, itself. So, the appearance
of the land that we see today, is commonly different than what it appeared at
the time of settlement.
In order to improve the area and extent of tillable lands, even early agricultural
practices included landform modification to aid the plow. Prior floodplain
modification is evidenced today by the historical placement of utilitarian levees
flanking the existing agricultural fields along the outer cottonwood tree lined
escarpments of each river. The levees are maintained to this day, and form
perimeter access to the rivers and tillable fields.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page I4
6.4.4 EXHIBIT D — Extraction Plan
The later creation of farm to market County Road 396 eased access to the
areas' agricultural fields, yet consequentially separates the fields at the TRP
with its graveled surface, and subsequent rights -of -way and easements.
The levees, public roads, cottonwood corridors and area tributaries are visible
in the different map exhibit aerial images, and will not be impacted by planned
extraction. All planned operations have conforming setbacks, and levee access
will remain limited to wheeled vehicles during operations.
Today, the upper terrace where extraction operations are planned, supports
agricultural crops above the lower stream terrace formed further below and
beyond the perimeter levees and cottonwood corridors that frame the adjacent
active stream channels. The Fields designated for resource recovery (Central
Field and North-West Field; as shown on Exhibit C - 2: Extraction Plan Map) lie
over a nearly level upper terrace of the two rivers. The South Platte
River borders the southern and eastern extent of planned extraction, and the
Big Thompson River intersects the permit area north of the Fields.
The stream terrace itself is a riparian area that supports on its flanking
escarpment an uneven aged stand of Cottonwood trees. The uneven aged
trees suggest this segment of the river has experienced some scouring in the
past from periodic, yet commonly limited, flooding; which encourages natural
regeneration of Cottonwoods.
To determine the influence of past activities on groundwater, twelve (12)
Piezometer Wells were located along and within the entire TRP boundary.
Groundwater level information here, is based on 8.5 years of continuous
monthly measurements at twelve (12) piezometer locations identified on the
included Exhibit G: Water Information Map. Recorded groundwater depths
vary in elevation below the surface, with a general (weighted) mean depth of
8.40± feet.
Groundwater elevations are influenced by crop irrigation practices that run
generally from April through September, and may occasionally lag into the
middle of October. During this time groundwater depths may be skewed
higher in elevation to the extreme North-eastern extents of Central Field, yet
with few exceptions, groundwater elevations over the entire site remain
significantly deeper than 5.11± feet from the surface, year over year, over the
entire TRP area.
Using the approximate surface elevation at the extreme eastern boundaries of
North-West Field and Central Field, and noting that groundwater fluctuations
will commonly meet at 8.40± feet below the surface, yet rarely rise more than
5.11± feet from the surface, we determined the Static Water Level using the
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page I5
6.4.4 EXHIBIT D - Extraction Plan
upper limit of 5.0± feet. The Cyan colored contour shown on Exhibit G: Water
Information Map represents the Static Groundwater Elevation at 4675' at
North-West Field, and 4673' at Central Field. Since completed reservoirs will
be lined to meet State of Colorado Water Resources specifications and
requirements, and since lined basins will ultimately equalize with the
surrounding groundwater elevations, the Static Water Levels shown should
reasonably reflect those of the both the lined or unlined state; and represent
a proper reflection of the optimal surface area of the water over the finished
basins. Raptor Materials, LLC has sufficient water to meet the circumstances
and obligations of both the lined and unlined states; and as reflected under
Exhibit G: Water Resources Information; until and unless the reservoirs have
an approved liner, the Operator will dedicate sufficient waters to secure the
reclamation of the resulting basins in the
unlined state.
Planned Field Activities: The 409.23± acre parcel boundary forms the permit
boundary, as reflected on exhibit maps. All lands under its direct control
within the 409.23± acre permit area, are affected lands under C.R.S. 34-32.5-
103(1), respective of this permit application. As a result, any changes required
in the nature of planned extraction or reclamation will be made only through
the Colorado Office of Mined Land Reclamation (OMLR), by Technical Revision
only. If lands are needed beyond the designated permit boundary, those lands
will be secured for the active OMLR permit by Amendment.
Within the permit boundary, there are twos` (2) identifiable areas designated
for primary extraction, the description of which will help to explain the nature
of planned extraction and reclamation. The Primary Areas of Extraction are as
follows:
162.57± Acres = Primary Extraction (***) Central Field: 15-25± years (2023- '48) **
41.04± Acres = Primary Extraction North-West Field: 4-8± years (2045- '53) **
203.61± Acres = Total Primary Extraction *
205.62± Acres = Affected Lands beyond planned extraction limits
409.23± TOTAL
(*) NOTE: The third area of secondary extraction is limited to approx. 5.860± Acres for a
Plant Processing/Stockpile Area Pond, as further indicated, below; and is not included in
this total.
(**) NOTE: Final reclamation will add up to five (5.0±) years to the anticipated Life of the
Mine, subsequent to completion of extraction and removal of all marketable
materials. Life of Extraction is an approximation, and could lengthen or shorten the
overall life of the mine depending upon market conditions.
(***) NOTE: Of the 162.57± Acres of Primary Extraction, 4.09± Acres comprise an
existing Farm Yard & Structures with residence. These facilities may be leased or
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [1121 CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 16
6.4.4 EXHIBIT D — Extraction Plan
otherwise utilized as an Office and Support/Storage facilities for Operations, potable
water and sanitation. Lands identified within a designated Extraction Limit may not be
extracted, including the Farm Yard area, as circumstances warrant according to the
discretion of the Operator.
Of the outlying 205.62± Acres, 5.80± Acres is planned as secondary extraction for the
Plant Processing/Stockpile Area Wash Pond.
The remaining 199.82± acres of lands within the permitted limits may comprise
planned or existing permanent access roads, levees, previously affected areas,
and areas of minor to no disturbance (including public transportation
corridors, right-of-way's, easements, permanent structures, river and stream
terrace and cottonwood corridor buffer areas), or other farm land features
or structures; or as otherwise determined from included maps and aerials.
These lands may also include essential support operations, including: parked
vehicles, equipment, plant site equipment and processing stockpiles, etc., not
otherwise explicitly indicated or shown, but reasonably associated with
operations of like kind, and may be varied in location and extent over time; or
otherwise, field fit within the permit boundary as warranted.
Wetland conditions appear confined within portions of the stream terrace and
bank -full stage of the rivers, and along segments internal to the Evans
Canal. Extraction will form a depression (basin) within the floodplain as shown
in Exhibit C-2: Extraction Plan Map. Temporary above ground fill may occur
within the floodplain, and as part of this permitted activity, provided the above
ground volume does not exceed the below ground volume created by
extraction. All product stockpiles and processing will occur within the city
limits of Evans under this application, and North and outside of the floodplain
boundary of the 100 -year floodplain of the Big Thompson River. The floodplain
extent will be visually marked in the field to better assure the integrity of the
floodplain.
Material transport of raw materials from extraction locations to the plant site
will be by mining equipment hauling within the extraction limits.
Known structures and landowners, including above and below ground utility
owners, located on and within 200± ft. of the permit boundary, are shown on
Exhibit C-1: Existing Conditions Map. Exhibit S: Stability Analysis - provides
certification from a registered professional engineer that these structures will
not be harmed by planned extraction profiles and extents.
'For lands within the Extraction Limits, only those structures, easements, and
rights -of -way shown in Exhibit C-2: Extraction Plan Map, are anticipated to
' Adequacy Item 18
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page I7
6.4.4 EXHIBIT D — Extraction Plan
remain from those shown in Exhibit C-1: Existing Conditions Map. If changes
to existing or possible revised structures, easements, or right-of-way are in
any manner retained, or where they might occur subsequent to OMLR
approval of this application, then a Technical Revision will be submitted to
update Exhibit C-2: Extraction Plan Map. All established setback distances
from planned activities to any remaining features will be maintained
regardless.
Operations or related Processing Areas and Wash Pond are not intended to
affect existing structures, Easements, or Right -of -Ways within the Planned
Extraction Limits identified as remaining and are designed to avoid and retain
any remaining structure, Easement or Right -of -Way on the surface, and
subsurface. Future agreements may be reached allowing mining in areas
currently identified as being restricted to mining containing certain
structures, Easements or Right -of -Ways.
Exhibit C-1 shows and identifies all these features understood by us, and the
respective Surveyed information, and correlated Observation and Title Work
upon which they are based and represented on the attending Maps. The Maps
are not Surveys. They are Maps and as such, they comprise a reasonable
representation of all site features, but must not be relied upon by themselves
exclusively for location purposes. Maps and features are not a substitute for
field identification of underground structures and will rely upon location
services of the 811 service. Setbacks where required will be based on the
actual field locations of site features.
Exhibit C-2 shows the remaining Oil Wells and Lines within Planned
Operations at the time of the Submittal. Any revisions, additions, or
modifications of residual Oil Wells or Lines will be avoided as represented on
updated Maps and Revisions to the Permit, and consistent with Setback
Distances identified in this submittal. Removal of any Existing Structures
such as the Oil and Gas structures and or lines, will be updated on required
Annual Reports, or by Technical Revision, as warranted, or as otherwise
directed consistent with Colorado Statute.
Access to the Theater of Operations: Entry into the permitted areas is
dependent upon the needs and necessary management of continued
agricultural activities during operations, as well as essential management and
mobility within the active areas of extraction, processing; and correlated need
for transportation of human resources, equipment, and product. Human
resources for operations, heavy equipment, and haul traffic will occur based
upon the desired and dynamic activities necessitated by time and
circumstance within the designated Fields. Access points for continued
agricultural, extraction, and plant site operations are shown " on Exhibit C-2:
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 18
6.4.4 EXHIBIT D — Extraction Plan
Extraction Plan Map, as follows (NOTE: Access purpose and usage may change
in time from that indicated here -in. Also, General Existing Dimensions and
length of existing access roads are represented in the aerial images on the
Exhibit Maps relative to the Access locations detailed, below. Modifications
may occur as needed and will be reported in OMLR Annual Reports.):
0
* Entrance 1: Farmstead entrance. Limited Access. Note: Visitors will first access operations
by checking in at an established plant scale -house, not here.
Entrance 2: Primary Access to the lower boundary of Central Field.
Entrance 3: Primary Western Access to the North-West Field.
Entrance 4: Primary Eastern Access to the Wash Pond and designated Plant Site.
Entrance 5: Adjacent Parcel Existing Access.
Entrance 6: Oil & Gas Access into the Western Section of Central Field.
Entrance 7: Primary Eastern Access to the North-West Field.
Entrance 8: Primary Northern Access to Central Field.
Entrance 9: Primary Northern Access into the designated Plant Site location.
Entrance 10: Internal Access from Adjacent Lands.
Entrance X — Agricultural/Mechanical
Entrance WV — Agricultural/Mechanical — Westervelt R -O -W Access to adjacent Wetland Bank
Existing roads outside of the permit boundary are shown on Exhibit C-1:
Existing Conditions Map. Existing on -site internal access roads are also visible
to scale in the aerial information provided under Exhibit C-2: Extraction Plan
Map and other map exhibits included with this submittal: In general,
Operations will predominantly utilize unmodified existing
agricultural field access roads (unless otherwise indicated), which will
themselves be subsequently extracted in time where they fall within the
extraction limits shown on Exhibit C-2: Extraction Plan Map. No other defined
roads within the Extraction Limits will occur except for the temporary paths
created by extraction equipment, or otherwise determined by subsequent
Revision to the permit.
All existing agricultural roads outside of the designated extraction limits will be
retained according to the desires of the landowner. The same shall form part
of the final end use of the reclaimed lands, unless otherwise indicated in this
submittal or by subsequent permit revision. For purposes of this submittal, all
lands within the indicated permit boundary will be considered affected lands,
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING 84 SAFETY
TECHNICAL REVISION 01
Page 19
6.4.4 EXHIBIT D - Extraction Plan
but only those locations between the existing access roads, and which
otherwise remain above the anticipated static water level of the resulting
basins, will be soiled (where soil is absent) and seeded to establish vegetation
consistent with the approved reclamation plan.
Area and Site Soils: Soil formation surrounding and within the project area
varies according to diverse geologic, natural, and man -caused influences. The
United States Soil Conservation Service, Soil Surveys, are the foundation
source for understanding area soils as identified on Soil Survey Maps by their
Soil Unit Number. Unit 3 Soil formations for Weld County are not easily
typified or quantified as other soil units, for a reason; natural and man-made
alteration and use of the land over time.
Planned extraction limits will affect predominantly Unit 3 Soils. Extract from Exhibit I/J.
Unit 3 soils commonly form within floodplains. As a result, differing states of soil formation
may exist within the soil unit designation; such as soils with little horizon development like
Entisols and Inseptisols. Mollisols with deep well -developed horizons may exist in the
minority and the near fringe of planned extraction. Refer to graphic above, and below.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [1121 CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 1 10
6.4.4 EXHIBIT D - Extraction Plan
Enceptisol
Inceptisol
Molisol
Soil Morphology
With over a century of agricultural manipulation of area agricultural fields,
prior mixing or importation of soils for land leveling, or flood plain
management in the creation of levees, may have dramatically altered the
original native soil profiles and properties. The native A profile of the upland
terrace found within the agricultural Fields at the TRP, is predominantly
modified as a plow (Ap) layer of 6.0± to 8.0± inches. The historic practice of
incorporating manure into the plow layer should have served to maintain the
organic base and quality of the cropped soils and accelerated soil horizon
formation and development where it was lagging. Since the cropped soils
have been irrigated, care should be taken not to salvage soils greater than
12.0± inches in depth to avoid mixing of potential accumulated salts.
Generally, total soil depth (including all soil horizons) over the property may
vary from approximately zero inches to four [4.0±] feet, yet predominantly
having a shallow Ap plow layer of six to eight [6-8±] inches, lacking a B profile
and having the potential for a mixture of silt, clay, or gravel outcrops over
random areas. Gravel depth may occur from the surface to the underlying Fox
Hills Sandstone varying at approximately 30.0± to 45.0± feet over the entire
property. Suitable soil in excess of that needed for reclamation will be made
commercially available to meet area infrastructure and residential demand.
Soils found within the entire project area are described more thoroughly
under Exhibit I - Soils Exhibit, and the attending Exhibit I/J - Soils and
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page I 11
6.4.4 EXHIBIT D - Extraction Plan
Vegetation Map, shown not to scale, above. Additional geologic
considerations are also included under Exhibit S - Stability Analysis.
Area and Site Geology: The area geology is typified by mixed alluvial and
aeolian development, that is commonly alluvial in nature at lower elevations.
As viewed in the Geologic Timeline and shown in Figure 1, below, the
aggregate deposit is found between the Laramie and Fox Hills Sandstone
formations, both formed during the Upper Cretaceous Period nearly 65
million years ago. The alluvium of the river valleys and aeolian sands that
cap the hills formed of the Laramie formation north of the permit area are
more geologically recent, developing during the Quaternary Period.
MILLIONS OF
YEARS
ERA PERIOD
EPOCH
Quaternary
Tertiary
r
Cretaceous
nurassk
Triassic
Pleirancnie
Pliocene
Miocene
Late
Eocene Late
P _
Paleocene Late
Early
tate
NOW
O.1
c..
.8
36
53
11.E
164
285
317
X41..
490
5.8
61
65.0
144
159
1►
206
227
2
248
Geologic Time - Livescience.com
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 112
•�.c
—lias.% r► `
'NI:IMP' ��r +
i
•
r i d
t•1., %
f
Figure 2: Area Geology 3D Oblique View
6.4.4 EXHIBIT D — Extraction Plan
Figure 1: Area Geology Map
The areas of extraction are in the alluvium whose general morphology. area and extent are better
understood in Figure 1 above, and 2 and 3, below (Colorado Geological Survey).
r'
•
I'
• it
"SA •-
1_ ••r
' • • • -
•
. •
- •T`
•
_ r
'Wale
•t
�-.,• •r r
- - .. - _ -• •. •• .••. r
ell n as
II 4
et
.. -• ti• . 1 r• ''rl . i.7 • t i . • • •• 1 • ,
•!• . r •. rric1 ' • !t` - ti .1 - / ! - •4. r.
K•• [5 -
▪ r . �a .� { tl- , t ! t 1 •• •r '� t4 ) t •_ 11 t {• - -- {' _••f sl
•{ r - • lie �.� - . -♦ ' . t .. r t y -. , fit r . �' r 1•, • -�
1 1. • •* _r• ,••
-- 1. ;I .J• • M• ..t .•'- •1 r 1 % nl .1
r• r •• t •. - }
r -• • •+-'• S "'*•
'I• •op• = - •. t • ▪ •'-`
•1•t - '
•
..• 'y
Y
▪ ti
•
•. -- �._ •. M'
•
a4
- t
•
r
-_
r
•• `•
.. ,
w' !D. J. '- . • •r • IS • r•t ,•• • s:/ ..
t _ - .... ' r -
• r r• • •• ft •
VD• V. •t . 1. -
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 1 13
6.4.4 EXHIBIT D — Extraction Plan
CORRELATION OF MAP UNITS
SL'RFICL4L DEPOSITS
HUMAN -MADE
DEPOSITS
I
L:.;tiI L
DEPO SITS
GRAVEL EOLIAN
DEPOSITS DEPOSITS
I
l of
r
... = ._
ai
Qa
Qcs
of
Qa:
r
Q$3
unconformity
unconformity
Qe
Ho:ocene
r :ei:tocene
Figure 3: Surficial Deposits relative to areas shown in Figure 2, above.
The aggregate deposits of Qal and Qa2 (Figure 3, above) form the bulk of the
deposit planned for extraction. Depths vary by field from approx. 30 to 45
feet. Depths are shallower as the adjacent hillside rises to the north; while
the deposit dips deeper toward the South -East of each designated Field.
Soil Salvage: Resource recovery will commence by first removing the upper
[A profile/plow layer] six to twelve inches of soil [six (6.0±) inches typical],
combined with existing grass or crop stubble. Removal will utilize scrapers or
excavators, aided by dozers where necessary, and hauled to the Northeast
Section of Central Field. All extraction and surface related activities detailed
in this application will occur under an approved Fugitive Dust Permit issued
by the Colorado Department of Public Health and Environment (CDPHE).
Until resoiling activity occurs, where harvested soils have been stockpiled and
remain undisturbed for reclamation or sale, they will be seeded with the
mixture specified under Exhibit L - Table L-1: Primary/Preferred Revegetation
Seed Mixture. A stabilizing cover of native vegetation may take up to three
years to fully establish the desired cover. In the event the native seed mixture
fails, an optional mixture of predominantly introduced species will be used as
a fall back to better assure a stabilizing cover of vegetation. Still, using the
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [1121 CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 114
6.4.4 EXHIBIT D — Extraction Plan
preferred native seed mixture offers opportunity to gauge the potential
performance of the selected species prior to utilizing it over larger areas
requiring reclamation later in the life of the resource recovery operation.
Once vegetation is established over the initial reclamation soil stockpiles,
they will likely remain untouched for the life of the operation until final
reclamation of remaining affected lands takes place. Where concurrent
reclamation is possible, operations will utilize soil in an over the shoulder
method when practical. In this manner, reclamation is expedited without
increasing soil stockpile volumes while reducing expenditures related to
labor, handling, and time.
Soil salvaged as stated above will range six to twelve inches in thickness.
Resulting volumes of salvaged soil will range from 131,100± - 262,300± cubic
yards for Central field, and from 33,100± - 66,300± cubic yards for the North
West field. Salvaged soil will generally be stockpiled on top of the Westervelt
soil storage area in the North-East section of Central field. Smaller short-term
stockpiles may be created along the pit edges where regrading is imminent or
in progress and resoiling will follow.
Resoiling volumes required above the waterline of the lined water storage
will require much less soil. The resoiling areas are estimated at 11.19 ± acres
for Central field and 4.76 ± acres for the North West field with volumes at a
nominal six inches of soil cover at 9,027 ± and 3,840± cubic yards
respectively. Excess soil not needed on site may be sold.
Dewatering: As extraction activity progresses into the aggregate profile,
groundwater must generally be removed in advance through the use of
pumps and subsequent discharge into area tributaries. A complete
dewatering evaluation was performed by AWES in their report of 27 July
2020, as provided at the back of Exhibit G: Water Information. The report
concludes that 'the results of analytical and numerical solutions indicate that
the proposed mine dewatering activities will not adversely affect the regional
groundwater hydrology.' The reader is further assured that all discharge of
waters will be conducted under an approved CDPHE discharge permit.
Initial dewatering of the property in preparation for extraction and resource
recovery will occur by establishment of a dewatering pump and/or well in the
Southern boundary near an existing agricultural pond. The point of
discharge is on Exhibit G: Water Information Map. Other discharge locations
may occur in time as needed and otherwise approved under the applicable
Z Adequacy Item 23/32
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING 84 SAFETY
TECHNICAL REVISION 01
Page 115
6.4.4 EXHIBIT D — Extraction Plan
CDPHE discharge permit requirements. Subsequent CDPHE approved discharge
locations will be field fit and the location updated in the following OMLR
Annual Report.
Active Resource Recovery: Following soil salvage, the balance of the
extractable deposit will be removed to the depth of the unconsolidated or
weathered bedrock, transported by mining equipment to the plant site pit
run, and subsequently manipulated as desired by screening, crushing,
washing, and other methods to size and properly dimension the earth
product into diverse merchantable materials for sale. Resource recovery will
commence from the northwest corner of the initial area of extraction,
establishing a keyway moving south, and then moving eastward via an
advancing face. The planned first discharge point is shown near the Southern
boundary of Central Field.
There are no fixed sequences or phases scheduled as part of the extraction
plan. Instead, Fields are used instead of Phases to describe the activities, since
each Field can be accessed concurrently instead of sequentially with the
other; as reflected or otherwise updated as part of required OMLR Annual
Reports. Under this method, extraction is 'pulsed.' As such, the rate
of extraction and subsequent reclamation will slow or quicken according to
influences of the markets, weather, and internal logistics. Flexibility in
Operations encourages better outcomes when adapting to changing
circumstance or unexpected field conditions, and may involve actively
working different fields or different parts of the same field as necessary.
'For Two Rivers, there are four Fields, intended as sequential areas of extraction unless market
demands warrant concurrent development:
• 121.86± Acres - Central Field — Center Section
• 15.58± Acres - Central Field — North-East Section
• 25.09± Acres - Central Field - West Section
• 41.04± Acres - North-West Field
Generally, flexibility aids integrity of operations and encourages optimizing
operational activity and subsequent reclamation of affected lands. Therefore,
any method that accelerates the extraction timeline will be utilized, and
should be encouraged to better engage the unpredictable elements and
variables that reasonably affect the capacities of the Operator.
Exhibit C-2: Extraction Plan Map, shows the location and planned extraction
limits, general direction of extraction, and related features described above;
s Adequacy Item 17: Aspects of detail required. Other aspects addressed elsewhere.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 1 16
6.4.4 EXHIBIT D — Extraction Plan
along with features made obvious in the included aerial image of the permit
location and surrounding lands.
Exhibits C-2: Extraction Plan Map and L: Financial Warranty Map, shows Initial
Extraction proposed to begin in the yellow hatch area shown on the Exhibit L
Map. The direction of extraction will advance to the east. As extraction
advances, the perimeter keyway (dewatering trench') will be established for
the 121.86± acre Center Section of Central Field. The initial area of extraction
is the anticipated mining advance in the first 5 years of extraction comprising
approximately 51.1± acres and will leave approximately 70.76± acres, that
may be extracted in later years. The Initial Extraction area is practical as it has
no encumbrances and is adjacent to the existing pond'.
The initial extraction area is bordered to the South along a near 800± foot
section of oil and gas line that is pending removal; along with the two oil and
gas wells, also pending removal (refer to Exhibit C for ownership details). If
or while this infrastructure is still in place, extraction will not occur within 10
feet of these lines, or 25 feet from the wells, as indicated in the setbacks
detailed below. Below this gas line is an existing pond and well that will be
used as a Settling Basin Area, containing at present a solitary settling basin
and pump as a point of discharge of groundwater. This pond may be
expanded or added to below this line and may then be extracted itself once
discharge is discontinued for Central Field Operations.
Perimeter Keyway Extraction will maintain a perimeter slope no steeper than
1.25H:1V, except for the perimeter shown in red along it's extraction limit,
and respective toe where cut slopes will not exceed 2.00H:1V; as indicated
(refer to Exhibit S: Stability Analysis for additional information). At the toe of
the cut perimeter slope is the keyway that runs below the extracted deposit of
the basin, into the bedrock, which allows the subsurface waters to flow to the
settling basin and discharge pumps necessary to keep the cut basin dry
during a time of extraction and reclamation of the affected perimeter slopes.
The keyway dimensions may vary more or less from 4± to 8± feet in depth
and 4± to 16± feet in width. Extraction must be broad enough to allow
equipment to safely approach the toe and excise the bed dimensions where
the resulting channel is sufficient to convey the groundwaters to the settling
basin for discharge.
a Technical Revision 01 Item: Modified from first adequacy response to better define the mining and reclamation
plan and reference a schedule in Exhibit E. [Let's discuss]
' Adequacy Item 15: Keyway clarification
e Minor edits in this paragraph in response to third adequacy review, noting updates to Exhibit C-2 and readability.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 117
6.4.4 EXHIBIT D — Extraction Plan
Please Note: The graphic representation of the Initial Mining Area and general
mining progression is idealized, and may vary in shape, size, and location
presented. Annual Reports will report on the nature and extent of affected
lands and more properly reflect actual conditions on the ground in a given
year of operations.
At anticipated production levels and production only from the Center Section of
Central Field, extraction of the remaining area could take 8-10± years,
overlapping with initial development of the next field. With sequential
development, extraction of the North-East Section of Central Field could take 3-
5± years, the West Section of Central Field 4-6± years, and the North-West Field,
6-8± years. Please Note: The time periods will depend on the actual rate of
production required to meet market demand, and the average annual advance
may also vary with thickness of the sand and gravel and ground conditions. Some
flexibility may also be exercised to optimize operations around or through
existing infrastructure if scheduled for removal.
Table E-1 provides a projection of mine development and regrading/reclamation.
The plan as described in this Exhibit D and also in Exhibit E, is a forecast and
may vary according to market conditions with mining and subsequent regrading
occurring faster or slower, sometimes significantly so. The geology may also
dictate changes in the rate of extraction. If efficiency demands in a higher
production demand scenario, up to four separate areas could be developed in the
manner described simultaneously. Such changes may happen quickly and would
be addressed in the Annual Report. 'In discussing this flexing of production and
scaling operations up or down with OMLR staff, a concern was raised as to
impacts on mule deer habitat if there were separate production areas with a
larger area under active production. This has been addressed as having minimal
impact in a letter from Ron Beane, Senior Wildlife Biologist with wildlife
consultant ERO Resources Corp attached as an addendum to this Exhibit D.
As discussed above and considered in the letter from ERO Resources Corp,
Raptor envisions up to four active mining areas (area of active extraction
operations) of up to 16 acres could be in production simultaneously for an
anticipated maximum active mining area of 64 acres. As noted in the ERO
Resources letter, this area is only a small percentage of the riparian corridor
within and adjacent to the extraction area and while Raptor would not
anticipate exceeding 64 acres of active mining area, small and temporary
variances may occur in response to market demands, coordinating operations
around existing infrastructure, water management, or to ensure safe
operations. The maximum disturbed area will continue to grow over the life of
the operation as the post mining land use is lined water storage and as noted
by the DRMS, until the basin is fully extracted and lined, and a leak test is
'Adequacy Item 17: Wildlife concern
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 118
6.4.4 EXHIBIT D — Extraction Plan
performed and approved by the State Engineer. Progressive regrading and
lining however will be performed and is discussed in Exhibit L.
8The fifth adequacy review requested Raptor address minimization of impacts
to mule deer population in the riparian corridor along the Big Thompson River
during construction of the project and during winter. Raptor commits to
construction activities will only be conducted during daylight hours and to not
leaving open trenches or pits during construction that could result in harm to
animals. Raptor also commits to limiting the use of lights on the conveyor in
the riparian areas.
Additional information is provided under Exhibit C-1: Existing Conditions Map;
which shows all known current and active significant man-made structures
located on or within 200 feet of the permit boundary detailed under including
creeks, roads, buildings, oil and gas facilities [such as tanks, batteries, wells and
lines], and power and communication lines and support structures, easements
and rights -of -way; located over the permitted lands or within 200 feet of the
same. A listing of the adjoining surface owner's names and addresses located
within these areas are listed under Exhibit C Text, correlated with those shown
in the afore -mentioned Exhibit C-1: Existing Conditions Map.
The extraction limits assure through the use of setbacks that other interests are
not affected by planned extraction. Extraction is set back uniformly at a
minimum 10.0± feet from the edge of property lines; easements and rights -of -
way; underground gas lines or other underground facilities, irrigation ditches
and seep ditch, wells and other structures. °Minor variations may occur in the
field over time from those represented on Exhibit Maps. The plans detailed in
this application are based upon future events for which minor or temporary
departures at any point in time may be evident. To the extent any significant
departure in the field occurs in a time and manner not otherwise anticipated in
these exhibits, the operator may cure by self -inspection, by observation from
OMLR inspection in a timely manner, or by operator -initiated Revision to the
Permit or otherwise via clarification in attending required OMLR Annual
Reports.
Extraction will not occur closer than 125± feet10 from the face of a residential
structure; unless there is a written accommodation with the owner of the
residential structure that allows extraction to occur within a closer stated limit.
Extraction will occur no closer than 25± feet from well heads and related above
ground facilities. Extraction around well heads will be concurrently backfilled
to maintain a 100± foot buffer from the balance of extracted lands. At all
a Fifth Adequacy Response
e Adequacy Item 21
1° Adequacy Item 22
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 119
6.4.4 EXHIBIT D — Extraction Plan
times, safety will take precedent and over -ride all other conditions in time with
a matter of safety or emergency respective to any and all aspects of the
approved permit.
To minimize the potential of river capture, planned setbacks from the two rivers
was evaluated by Flow Technologies (refer to report at the back of Exhibit G:
Water Information - titled: Two Rivers Riverside Berm Failure Analysis and Flood
Control Mitigation Plan' of 22 January 2020). The report finds:
`... that head cutting/erosion will not progress through the full length of
a 100 -ft riverside berms. It is important to note that should a flood occur
that results in head cutting/erosion of a riverside berm, Varra
Companies, Inc. will act diligently to restore the damaged areas to pre -
flood conditions.
As mentioned, this analysis is conservative and riverside head
cutting/erosion is based on the 100-yr flood. There is a small probability
that such a flood event could occur during extraction and when the pit is
dewatered.
The DRMS in a supplemental adequacy response dated November 17, 2022
challenged the validity of the engineered design approach taken by Flow
Technologies despite having accepted it as valid in the past. Raptor Materials
believes the approach is valid and is in the process of performing an analysis
by alternate methods incorporated in HEC-RAS. This, however, will take time.
Raptor has per DRMS suggestion decided to adopt the 400 -foot setback from
the top of the riverbanks to the top of the pit -side slope based on guidance
developed using generic and non -site -specific empirical methods as adopted by
the Mile High Flood District whose jurisdiction does not include the proposed
operation. Raptor Materials intends after permit approval to present the results
of the ongoing engineering evaluation as a Technical Revision to obtain relief
from what we are confident are extreme setbacks.
During extraction, a predominantly vertical advancing pit wall (the extraction
front) is not anticipated due to the use of excavators in the removal of the
material deposits. Excavators provide a great deal of control over the
extraction process. The maximum length of the extraction front will likely
never exceed the maximum cross-sectional length of the center section of the
Central Field as the advancing front moves eastward, or 2,640± feet, or less; in
any given direction. The advancing front will result in a moving face with a
slope typically equal to or flatter than 1.25H:1V, and commonly not greater
than 1.25H:1V along the perimeter of the extraction limits to depth.
The exception to cut perimeter slopes is shown with a distinct Red Boundary on
Exhibit C-2: Extraction Plan Map, where cut slopes will not exceed 2H:1V in
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 120
6.4.4 EXHIBIT D - Extraction Plan
order to maintain integrity and stability along that designated perimeter area
(refer to the AWES Slope Stability Analyses of 23 December 2019, located at the
back of this exhibit). Internal transport of extracted materials to conveyor
systems or other internal transport; or otherwise by approved public roadways,
will be used in the transportation of extracted materials to the designated
plant/stockpile location, described in greater detail, below.
Acreage to be affected during the first year of extraction activities include the
establishment of the initial Wash Pond and attending Settling Pond(s), Plant
Site, and Initial Areas of Extraction and attending means of transportation by
ground haulage. While the acreage required for the Plant Site and Wash Pond
are not expected to change, the Initial Area of Extraction will expand until
concurrent reclamation follows as each location is exhausted of resource.
Although initial extraction may otherwise result in temporary slopes up to
1.25h:lv, all cut slopes will be backfilled with unconsolidated bedrock,
overburden (on -site unmerchantable excess materials, or imported inert
materials) and soil to advance the reclamation and completion of the desired
basins. Final reclaimed slopes and grades will be concurrently
established where practical to 3h:lv, or flatter, and at a minimum from 5± feet
above to 10± below the expected water level of each location of extraction, and
to the basin floor.
Concurrent backfilling and grading of cut perimeter slopes, while desirable,
may be obstructed in time and extent by the need to maintain keyways and
basin discharge during extraction. Backfilling of slopes can only occur once
enough of the floor is exposed to facilitate backfilling and finished grade of
extracted basin slopes without interfering with basin discharge
operations. This makes concurrent backfill difficult to accurately forecast.
Regardless, any completed slope remediation will be indicated in any
subsequent OMLR Annual Report.
Cut slopes will cause direct precipitation to drain internally into the resulting
basins and are not anticipated to result in any off -site impacts due to erosion
or stormwater runoff. The gentle to near flat topography of the area
landscape tends to aid in overall stability above the planned areas of
extraction. While some erosion of resulting basin perimeter slopes will be
evident subsequent to extraction, the advance of reclamation activity over
affected lands will provide cover for both near and long-term stability of those
lands remaining above water level of the finished basins. All completed slopes
above the anticipated static groundwater elevation will be soiled, seeded and
stabilized as provided for under Exhibit E - Reclamation Plan.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112) CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 121
6.4.4 EXHIBIT D — Extraction Plan
Of the total 203.61± acres of potential extraction, the resulting basins will
function as multiple -use reservoirs with a slightly fluctuating combined water
surface area covering 187.66± acres. The remaining balance of 37.3± acres of
land above the anticipated high-water mark of the reservoirs, and not otherwise
committed to existing or planned structures or infrastructure over the parcel,
will be stabilized with vegetation; including the anticipated 15.95± acres of
basin slopes reflected in the total.
NOTE: Shoreline irregularities and fill to establish and enhance the aesthetic
and end -use functions of the resulting basins shown on Exhibit F: Reclamation
Plan Map, are illustrative only, as this effect as to location and extent will be
field -fit where practical, and may substantively different from that portrayed
under the application. The actual location and extent will be identified in
subsequent OMLR Annual Reports, and absent there, at the time of any
applicable release of a location in part or whole from the permit. Since
representations cannot be accurately portrayed in advance, Exhibit F simply
identifies the near maximum extent [typical] of the resulting basins or ponds
and the potential for shallows during lining and finished grading.
The estimated timetable for extraction, commencing approximately spring to
winter 2023; is estimated to take 23-28± years combined, or longer, followed by
an additional five years to complete reclamation; or a total estimated life of the
mine of 28-33± years; ending approximately winter 2051 to 2056. This is a life
of the mine operation and all timetables are estimates and may prove shorter
or longer than stated. The final determination will occur five years after the
deposit is exhausted and all marketable product has been removed and
necessary infill completed at the location to the point of final reclamation as
approved or modified under the terms of the permit is completed.
This submittal is unable to fully forecast the maximum extent of affected
land expected at any given point in time, beyond an annual basis. As
operational extraction and reclamation efforts will vary annually, the timing
of extraction, reclamation, and life of operation as forecasts must be based
on an initial estimate [refer to Exhibit L - Reclamation Costs], then
subsequently verified and adjusted as reasonably determined at the time of
the required OMLR Annual Report. If justified by field conditions, a rider to
the warranty would follow in due course to reflect current or forecast
conditions where such conditions cannot be reasonably attenuated in a
timely manner prior to the due date of the next year's Annual Report. This
will serve to assure flexibility and confidence in continued operations until
completion of the desired end use.
Additional information on the reclamation and restoration of affected lands is
identified under Exhibit E: Reclamation Plan. All reclamation will follow
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 122
6.4.4 EXHIBIT D — Extraction Plan
guidelines established under Exhibit E - Reclamation Plan and Exhibit I/J: Soils
and Vegetation Information, until and unless otherwise revised. To the extent
possible, pond bottoms will be left rough, with the possible introduction of
logs or other non -putrescent inert material to aid in aquatic habitat and cover
[Refer to Exhibit H - Wildlife Information].
Plant Site Development & Operations: Plant operations are generally
comprised of portable equipment. A small wash pond will be established near
the onset of extraction operations as shown in Exhibit C-2: Extraction Plan
Map. Deposit materials are predominantly transported or conveyed from the
extraction areas to the plants or surrounding yard, where subsequently
processed and scaled for sale. Pit -run (unprocessed materials) may also be
loaded and transported directly from the extraction areas to area markets as
needed and where appropriate. Plant Site operations may also receive and
process materials, and utilize fresh water supply, sourced from locations
outside of the permit area or planned areas of extraction. Provisions for a
material processing plant may at some point be joined by complementary
processing that may include periodic use of on -site recycling facilities.
While recycling activities may occur within the approved plant site/stockpile
location; concrete and/or asphalt batch plant facilities and locations are not
presently determined or sought at the time of this submittal. Due to the
extended life of the mine the Operator desires an essential flexibility to
complement future area needs according to permit requirements and
approvals applicable at the time should such facilities be sought. Any facility
development of this kind will be determined at that time as identified in a
later Technical Revision to the OMLR under the approved permit. These
potential activities are mentioned here solely for purposes of transparency in
establishing these activities as acceptable, normal, and necessary activities to
meet and facilitate the delivery of essential construction material needs of the
area which may occur over time during the life of the approved OMLR
Construction Materials Permit Operations.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 1 23
6.4.4 EXHIBIT D — Extraction Plan
SW MATERIAL
PROCESSING
AREA at 18.4±
ACRES
CENTRAL FIELD
WEST SECTION
S
SW WASH POND
5.8 ACRES
near
Initial Plant Site Theater as seen in Exhibit C-2: Extraction Plan Map
SOUTH PLATTE RIVER
INITIAL
AREA OF
EXTRACTION
GENERAL MINING PROGRESSION
NOTE THE EXTI
SHAPE. AND FA(
VARY FROM THI
DEPENDING ON
GENERAL MINING PROGRESSION
POSSIBLE PARKING 8 EQUIPMENT
STORAGE (SUBJECT TO CHANGE)
SETTLING BASIN
All plant site processing activities will occur within the Central Field - West
Section; extraction will begin in the Central Field - Central Section, then
progress to the North-East section, West Section, and finally the North West
field. All sections of the Central Field are located within the 100 -year
floodplain, located south of Weld County Road 396 and north of the South
Platte River. Location of the processing plant and wash pond within the 100 -
year floodplain were approved as part of the Floodplain Development Permit
for the Two Rivers Sand Gravel and Reservoir Project
Plant activities will require a wash plant and attending wash pond to recycle
wash water and receive discharge silts and other reject fines from the washed
product. Plant and Wash Pond areas are identified on Exhibit C-2: Extraction
Plan Map. The wash pond will function as recycling wash water and receiving
basin for reject fines for the intended Plant/Processing activities. Since the
basin functions in a closed system, it will not require dewatering.
Once the wash pond is established, wet plant operations can be created and
join any dry plant activities in progress. Dry Plant operations can be readily
established since water is not integral to their operations. Once established,
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT (112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 124
6.4.4 EXHIBIT D — Extraction Plan
wash pond water will function as a closed system. Settled materials from
wash ponds will be utilized as product or for reclamation as desired.
Plant equipment will include, but is not limited to, a crusher, screens, and
conveyors, scale house and scale, and attending equipment. Resulting
stockpiles of pit run and processed products may be temporarily stockpiled
here with processed stockpiles, or combined as needed, until transported to
market.
Ultimately, once the wash plant activities near the completion of extracted
deposit material, the closed system wash pond will fill with silt and be
revegetated in a manner consistent with Exhibit E - Reclamation Plan. Interim
clean out of the wash pond will occur until that point, returning the inert
materials to the bottom of exhausted pits, or utilizing it in part or in whole as
product, or for purposes as substitute soil, soil additive, or as subsoil for
reclamation.
Plant and material processing activity will divide materials into diverse and
dynamic product stockpiles that will come and go with unpredictable
variations in sale and production. To the extent possible, product material
will surround plant activities to further lessen visual and noise impacts to
surrounding properties.
Plant placement will assure that plant noise is well below that of the nearby
traffic. Relative to noise, traffic travelling on area roads at 55 mph or above is
approximately 70.0± decibels within 100 feet from the centerline of the
Highway. Noise at ground zero at a cone crusher, as measured by a hand-
held meter, is at 80.0± decibels, dropping to 70.0± decibels at I00.0± feet from
the center. The level drops an additional 5.0± decibels for every 100.0± feet
from the center of the crusher and surrounding plant noise, achieving
residential background levels at a total setback of 400± feet.
Backup sirens and heavy equipment averaged 60.0± to 75± decibels, with
similar decreases in decibel readings from the source measured in a manner
similar to that indicated for the crusher and plant equipment sources. Plant
stockpiles will aid muting of plant sourced noise just as noise levels at areas
of extraction are buffered with increasing depth of extraction.
The location of the portable scale and scale house and correlated internal
traffic at the plant site location will vary depending upon production levels
and areas needed for product stockpiling. Regardless, the scale house will be
located along internal paths for haul trucks, where finished material will be
weighed and disembarked to help build the urban matrix of roads, highways,
foundations, and desirable neighborhoods communities most desire.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 125
6.4.4 EXHIBIT D - Extraction Plan
For a diverse list of products to be extracted and/or processed, and sold, they
may include but are not limited to the more common products identified
under Table DI - Earth Products, or other inert or commonly useful products
used for diverse construction purposes, including, but not limited to: structural
fill, concrete products, road construction products; and other products to aid
the residential, commercial, industrial customer; and for any other
infrastructure use. Explosives - will not be utilized.
RAPTOR MATERIALS LLC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 11
6.4.12 EXHIBIT L - Reclamation Costs
(1) All information necessary to calculate the costs of reclamation must be submitted
and broken down into the various major phases of reclamation. The information
provided by the Operator/Applicant must be sufficient to calculate the cost of
reclamation that would be incurred by the state.
(2) The Office may request the Operator/Applicant to provide additional, reasonable
data to substantiate said Operator/Applicant's estimate of the cost of reclamation
for all Affected Lands.
Summary of Reclamation Costs:
$ 68,648.00± Site Discharge
$ 268,078.71± Total Grading per Extraction Front.
$ 82,674.32± Total Liner Construction Expense
$ 47,939.42± Total Re -soiling (inc. Processing area)
$ 64,983.74± Total Re -vegetation Expense (inc. Processing area)
$ 14.192.80± Total Processing Removal Expense
$ 546,516.98± Sub -Total
$ 2.978.00± Mobilization and Demobilization Costs (per DRMS estimate)
$ 549,494.98± Sub -Total Direct Costs
$ 209,413.02± Indirect Costs based on DRMS Indirect Costs Estimate @ 38.11 %
of Total Reclamation Costs
$ 758,908.00± Grand Total — Financial Warranty Amount — Pending OMLR
Review
SUMMARY OVERVIEW:
Table 1 - Primary Data on Area of Total Proposed Affected Lands and Reclaimed Features:
Entity
Central Field
North-West Field
Combined
Extraction — finished basin (Acres)
162.57
41.04
203.61
Static Water Area — surface (Acres)
151.38
36.28
187.66
Static Water Area — elevation (ft.)
4,673
4,675
Basin Lands Above Static Water
Level (Acres)
11.19
4.76
15.95
Basin Area Volume (cu.yds.)
7,278,366
1,649,937
8,928,303
Static Water Level Volume (Gallons)
1, 470, 040, 694
333, 244, 376
1, 803, 285, 070
Static Water Level Volume (Acre Feet)
4,511.4
1,022.7
5,534.1
Plant Processing Area (Acres)
18.40
Wash Pond Area (Acres)
5.80
Total Lands Above Static Water
Level (Acres)
37.31
NOTE Well: All lands within the 409.234± acre permit area are considered as affected
lands under C.R.S. 34-32.5-103(1) respective of this permit application and any
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 12
6.4.12 EXHIBIT L - Reclamation Costs
subsequent permit revisions or amendments to the permit as originally approved.
Previously affected ground prior to on -set of Operations under this permit will not be
reclaimed under the terms of this permit unless otherwise re -affected beyond their
original state. Public Lands and other easements and Right -of -Ways are offset from
operations and while they may fall within the 409.234± acre parcel — are excepted from
the permit conditions to the extent of their approved setbacks.
The following estimates utilize assumptions based upon the pre -disturbed state of the
application for purposes of determining estimated costs of reclamation and correlated
financial warranty. Where appropriate, information is generalized and approximated
from similar estimates determined by the Colorado Office of Mined Land Reclamation
(OMLR), as indicated.
RECLAMATION EXPOSURE:
Based upon the Extraction and Reclamation Plans of this application, the status and trend
of activities and affected land; and related calculations to estimate reclamation liability,
are determined as follows.
Please Note: Due to the difficulty of calculating heavy equipment costs similar to the
Division's software program, unit costs from previous and reasonably current Division
estimates of like or similar kind have been utilized to create a reasonably close estimate.
The per unit basis from Division records are shown along with other sources used or
referenced to determine unit costs, at the back of this exhibit.
METHOD OF EXTRACTION:
Before concurrent grading, resoiling, and revegetation for reclamation can commence, a
perimeter keyway (dewatering trench') must first circumnavigate the area where the
perimeter slopes form along the extraction limits. For Two Rivers, this includes four
sequential areas of extraction:
• 121.86± Acres - Central Field — Center Section
• 15.58± Acres - Central Field — North-East Section
• 25.09± Acres - Central Field - West Section
• 41.04± Acres - North-West Field
Exhibit L: Financial Warranty Map, shows Initial Extraction will begin in the northwest
corner of the yellow hatch area shown on the Exhibit L Map. The direction of extraction
will first progress southward, following the perimeter of the extraction limits in order to
Adequacy Item 15: Keyway clarification
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 13
6.4.12 EXHIBIT L - Reclamation Costs
establish the western perimeter keyway for the 121.86± acre Center Section of Central
Field. An advancing front will then be pushed eastward as extraction progresses. The
initial extraction area comprises approximately 51.07± acres and will leave approximately
70.79± acres that may be extracted as needed as keyway drainage capacity allows.
The initial extraction area is bordered to the South adjacent to a near 800± foot section
of oil and gas line that is pending removal; along with the two oil and gas wells, also
pending removal (refer to Exhibit C for ownership details). Extraction will not occur within
10 feet of these lines, or 25 feet from the wells, as indicated in the setbacks detailed under
Exhibit D: Extraction Plan. Below this gas line is an existing pond and well that will be
used as a Settling Basin Area, containing at present a solitary settling basin and pump as
a point of discharge of groundwater. This pond may be expanded or added to below this
line.
Perimeter Keyway Extraction will maintain a perimeter slope no steeper than 1.25H:1V,
except for the perimeter shown in red along it's extraction limit, and respective toe where
cut slopes will not exceed 2.00H:1V; as indicated (refer to Exhibit S: Stability Analysis for
additional information). At the toe of the cut perimeter slope is the keyway that runs
below the extracted deposit of the basin, into the bedrock, which allows the subsurface
waters to flow to the settling basin and discharge pumps necessary to keep the cut basin
dry during a time of extraction and reclamation of the affected perimeter slopes.
The keyway dimensions may vary more or less from 4± to 8± feet in depth and 4± to
16± feet in width. Extraction must be broad enough to allow equipment to safely
approach the toe and excise the bed dimensions where the resulting channel is sufficient
to convey the groundwaters to the settling basin for discharge.
Please Note: The graphic representation of the Perimeter Keyway Extraction is
idealized, and may vary in shape and size presented. Annual Reports will report on the
nature and extent of affected lands and more properly reflect actual conditions on the
ground in a given year of operations.
UNITS OF DISTURBANCE:
The life of the operation is based upon a base rate of extraction approximating 8.0± acres
of disturbance in a given year. This time will pulse with the market and may average 8.0±
acres, but could be faster or slower. Starting out, initial warranty necessary to cover the
costs of reclamation for the extent of disturbance in a given year will also vary in time and
circumstance, as the initial disturbance is generally less at the onset. So, a rate of
disturbance can be estimated and the warranty adjusted incrementally with time and
circumstance.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT (112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 14
6.4.12 EXHIBIT L - Reclamation Costs
Starting out in the initial projected 5 years of Operations, and incrementally thereafter,
necessary warranty can be estimated and adjusted in incremental Units based upon the
projected Life of the Operation. Essentially, a 28-33± year Life of Operations assumes a
rate of extraction of approximately 8.0± acres per year.
Considering the Mining -Regrading Schedule included as Table E-1 in Exhibit E, and the
general development concept shown on Exhibit L: Financial Warranty Map, Raptor
estimates for the initial 5 -year period, development of an initial 51 -acre excavation in the
Center Section of Central Field will result in creation of approximately 4,310 -foot of
external perimeter pit wall. No reclamation or lining is anticipated in the initial 5 -year
period.
Raptor estimates for Financial Warranty purposes an approximately 2,131 -foot wall
excavated at 2H:1V and a 4,069 -foot wall at 1.25:1V slopes.
It is important to note that the financial warranty estimates the closure cost of the
operation at the end of the expected first 5 -year period. It is assumed in this initial estimate
that no reclamation activities (regrading, lining, topsoiling) will take place. The cost
estimate then reflects reclaiming the projected excavation at that point in time. The actual
extents and shape of the excavation may change, and actual progress will be addressed
in the annual reports.
Raptor will update this Exhibit L, the reclamation cost estimate, and any other exhibits as
required for purposes of determining financial warranty prior to disturbance reaching the
limits projected in the initial 5 years of Operations as described in this Exhibit and shown
conceptually on Exhibit map C-2 and L.
In the following breakdown of components for estimating reclamation cost, factoring of
the 5 -year projected disturbance against the final pits is used where appropriate to obtain
a reasonable estimate of work required. Various approaches to obtain the necessary
quantities exist, but Raptor believes the approaches and quantities are reasonable and
alternate approaches would be no more certain as to the accuracy obtained. This is simply
due to the variable nature of the deposit and the need to field fit the excavation to ensure
safety in the conditions encountered.
DEWATERING:
Raptor assumes that the pit would be in an unlined state and if operations had ceased,
would recharge to static water level requiring dewatering of the pit to allow reclamation
operations to be completed.
95 hp. 2,800 gal./min./pump x (up to) 5 pumps @ 24 hours/day
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 15
6.4.12 EXHIBIT L - Reclamation Costs
Volumes:
For the initial 5 -year excavation: 436,778,685± gallons
Total Cost for initial 51.1± acres of Discharge = 436,778,685± ± gallons x $ 0.000131/gal.
discharge (refer to Kurtz est. utilizing similar pump and rates.)
$ 57,218.01 -Initial Discharge Cost for 51.1± acres
It is assumed that ongoing dewatering will be required during reclamation of the pit and
Raptor has allowed for 30 days once the pit has been dewatered.
The estimated inflow rate to the fully excavated pits has been estimated at 15,190,000
gallons/day. The estimate is based on modeling of the groundwater by AWES in support
of Exhibit G: Water Information. A memo summarizing the basis of the estimate is
attached as a new addendum. The initial 51.1 -acre excavation area represents
approximately 25.1% of total extraction area (203.61 acres). Total discharge to maintain
dry conditions for reclamation then is:
15,190,000 gallons/day x 25.1% x 30 days = 114,299,882± gallons
Cost for 30 working days of Discharge = 114,299,882± gallons x $ 0.0001/gal. discharge
(rate taken from the DRMS March 23, 2023 Reclamation Cost Estimate for Two Rivers.)
$ 11,429.99 30 days Dewatering Cost for 51.1± acres
$ 68,648.00 Total Dewatering Cost for 51.1± acres
Please Note: 2The basins will be lined or otherwise segregated from the area
groundwater, in order to liberate the water otherwise retained to supplement loss from
evaporation in the unlined state.
GRADING:
As stated above, Raptor conservatively estimates for Financial Warranty purposes an
approximately 2,131foot wall excavated at 2H:1V and a 4,069 -foot wall at 1.25:1V slopes
along the extraction limits flanking WCR 396; and 2H:1V along the South Platte River
levee, as shown on Exhibit D: Extraction Plan, and Exhibit L: Financial Warranty Map.
Actual volume of fill required to grade at 3H:1V for a respective cut slope is determined
in the graphics, below. Square Foot volume of backfill x linear feet of slope divided by
2 Adequacy Item 28
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 16
6.4.12 EXHIBIT L - Reclamation Costs
27 will yield the required cubic yards needed for each section of highwall. A rate per
Loose Cubic Yard of fill taken from the previously approved values determined by the
OMLR, is used to better ensure the integrity of the resulting values.
DI
40.0'
depth
is%
1
)�
i rA I •
1 '1
•
Z3i : 1 V
// FINfttED
R A D E
FILL TO GRADE = 800 SQ.FT.
D
AC1A
40.0'±
depth
V
3H:1V faisistsi
FINISHED
GRADE.
FILL TO GRADE 1,400 SQ. FT
Hauls are expected to be very short excavating material from the core area where
material is readily available to establish final grade on those walls at 3H:1V and placed
on the exterior walls to establish the required grades. It is estimated that there would be
approximately 1,880 -foot of advancing wall and side slopes in addition to the 4,320 -foot
extraction limit wall. Due to the very short hauls it may only require a wheel loader
operating in load/carry/dump mode with a supporting Tracked Dozer. At most, the
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112) CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 17
6.4.12 EXHIBIT L - Reclamation Costs
method of fill will utilize one (1) Excavator/Loader, two (2) Haul Trucks, together with a
supporting Tracked Dozer and one (1) Sheep's Foot Compactor. The concept for
establishing the regraded slopes for financial warranty purposes is shown in the following
figure.
NW FIELD =
41.04* ACRES
INSTAL
AREA O%
EXTRACTION
:AL FIELD
SECTION
3W WASH POND
- 5.8 ACRES
GENERAL UM** PROGRESSION
NOTE. T+E EKTRACTIGN AREA 3>2E
SHAPE. AND FACE ORIENTA T ICN MAY
VARY FROM THAT PORTRAYED
DEPENDING ON FIELD CONDITIONS
GENERA.. MINING PROGRESSION
Approach to regrading interior and extraction limit slopes for financial warranty purposes.
4
CENTRAL FIELD
= 162.57* ACRES
CENTRAL FIELD
CENTRAL SECTION
2MtVCUT SLOT
\it I
Assuming a mean depth of advancing cut of 1.25H:1V at the extraction limits of 40.0±
feet depth:
4,069± lin.ft. (extraction limit) x 1,400.00± sq.ft. (required fill — Diagram 1, above)
210,985± LCY
210,985± LCY
x $ 0.947± per LCY.
$ 199,802.97± fill along an 4,069 -foot extraction limit cut at 1.25H:1V.
Assuming a mean depth of advancing cut of 2:1V at the extraction limits of 40.0± feet
depth:
2,131± lin.ft. (extraction limit) x 800.00± sq.ft. (required fill — Diagram 1, above)
63,141± LCY
63,141± LCY
x $ 0.947± per LCY.
$ 59,794.28 Sub Total -Grading to 3H:1V along an 2,131 -foot extraction limit cut at 2H:1V
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page l8
6.4.12 EXHIBIT L - Reclamation Costs
To compact the soil required for regrading, a total volume of 210,985 LCY + 63,141 LCY
= 274,125 LCY is considered with a 0.91 shrinkage factor, for a total of 249,455
compacted cubic yards (CCY).
249,455 CCY
x $ 0.034± per CCY.
$ 8,481.46 Sub Total -Compacting fill above the length of the entire liner (6,200 linear ft)
$ 199,802.97 Sub Total -Grading to 3H:1V along a 4,069 -foot extraction limit cut at
1.25H:1V.
+ $ 59,794.28 Sub Total -Grading to 3H:1V along a 2,131 -foot extraction limit cut at
2H:1V.
+ $ 8,481.46 Sub Total- Compacting fill above the length of the entire liner
$268,078.71± Total — Initial Grading.
Liner Installation:
Raptor has made allowance for liner installation on the regraded slope. Assumptions are
that a 4 -foot -thick liner will be keyed into bedrock at the base of the regraded slope and
up the slope to approximately 5 -foot below the original surface elevation. The keyway
dimensions in bedrock are assumed to be 4x4 -foot.
For the exterior walls at extraction limits, the regrade and liner installation is as described
in Exhibit E. Typical liner installation as described previously in Exhibit E is shown in the
following figure. The volume of liner material required will vary according to the slope of
the wall the liner is installed on. The volume of liner material is conservatively estimated
based on the perimeter length at the top of the liner.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page I 9
6.4.12 EXHIBIT L - Reclamation Costs
Typical Liner and Regrade for Extraction Limit Wall — Final Reclamation
Original ground surface
Topsoil
Static Water Level
Sequence
1. In cycles
• Install liner in 6" lifts
• Backfill to 3H:1V
2. Replace topsoil
Regraded slope at 3H:1V
Unexcavated Perimeter Wall
(slope 1.25H:1V)
Typical Liner and Regrade for Extraction Limit Wall
Bedrock
Backfill material
Raptor conservatively estimates for Financial Warranty purposes an approximately 2,131 -
foot wall excavated at 2H:1V, a 4,069 -foot wall at 1.25:1V slopes. The average length of
slope to be regraded is proportional to the length of the initial excavation occupied by
1:25:1 slopes (65.6%) and 1:2 slopes (34.3%): 0.656 x 56 ft + 0.344 x 78 ft = 63.6 ft.
The total cost of installing the liner includes grading the slope under the liner, hauling
liner material to the pit area, mixing the liner material, and compacting the liner. Assume
that half of the total liner material will need to be mixed.
Grade Slope under Liner
Cost: (6,200 lin.ft. x 63.6 ft. x lft. depth)/27 x 1.215 (swell factor) x $0.425/LCY =
$7,537.
Haul Liner Material to Pit Area
Vol (liner): (6,200 lin.ft. x 63.6 ft x 4 ft. depth)/27 x 1.00 (swell factor) = 58,383 CY
Vol (keyway): (6,200 lin.ft. x 16 sq.ft.)/27 x 1.00 (swell factor) = 3,674 CY
Vol total: 58,383 CY + 3,674 CY = 62,057 CY
Cost: 62,057 CY x $0.947/CY = $58,768
Mix Material for Liner
Vol (mixed): 62,057 CY / 2 = 31,028 CY
Cost: 31,028 CY x 1.215 (swell factor) x $0.232/LCY = $8,746
VARRA COMPANIES, INC. IWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 110
6.4.12 EXHIBIT L - Reclamation Costs
Compact Liner
Cost: 62,057 CY x 0.91 (shrinkage factor) x $0.135/CCY = $7,624
$ 82,674 Total Liner Installation Cost
NOTE: This is a conservative approach to the estimation of reclamation cost for financial
warrant at the projected 5 -year disturbance. The distance of 2H:1V wall is maximized
which has a higher lining cost than wall at 1.25H:1V. Also, if sufficient backfill material
were available or accessible on site from either topsoil or overburden material in
temporary stockpiles, or readily accessible from bedrock exposed, backfilling all the
slopes with available material and installing the liner in typical fashion as described in
Exhibit E would be significantly less expensive.
Soil Demand AND Re -soiling of Affected Lands (refer to Exhibit D):
In the mined area, soil demand is limited to the cut basin slopes remaining above the
static water level. For Central Field, the total area above the anticipated static water level
of the basins is 11.19 ± acres. Additionally, the areas disturbed in the Materials Processing
Area and the Wash Pond will require re -soiling and revegetation. We conservatively
estimate that the entirety of the Materials Processing Area (18.4 acres) and the Wash
Pond (5.8 acres) will require re -soiling for the purpose of this Financial Warranty.
To estimate the area involved in resoiling the Center Section of Central Field — we'll use
a percentage of the total perimeter length of the extraction limits involved:
14,311 Total perimeter length Central Field
4,310 External perimeter length Center —Central Field —extraction limits
+1,890 Internal perimeter length along advancing front
6,200 Combined perimeter length
6,200 - 14,311 = 43%
11.19 acres x 43% = 4.8± acres requiring resoiling and revegetation (see Establishment
of Vegetation over Affected Lands, below.
At a depth of 0.5± feet, total volume = 4.8± acres x 0.5± feet of soil replacement, is:
4.8± acres x 43,560.0± sq.ft./acre _ 27 cu.ft./cu.yd. x 0.5' depth = 3,911± cu.yds..
The majority of soil placement can occur using the average placement distance of 600
ft., or less along embankments, (utilizing the same assumptions utilized at either Kurtz
or Heintzelman Projects).
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 111
6.4.12 EXHIBIT L - Reclamation Costs
The cost to haul the topsoil to the pit area is:
3,911± cu.yds of soil demand
x $ 0.947 per LCY.
$ 3,703.36± to replace 0.5± feet of soil over the existing affected lands remaining
above the anticipated final water level at the Center of Central Field along
the perimeter cut slopes at the extraction limits.
The cost to spread the topsoil along the pond bank is:
3,911± cu.yds of topsoil x 1.215 (swell factor) = 4,751 CY
x $ 0.257 per LCY.
$ 1,221.11± to spread the topsoil along the disturbed banks of the pond at the
extraction limits above the final water surface elevation.
Similar calculations can be performed for re -soiling the Materials Processing Area and the
Wash Pond:
For a total area of 24.2 acres, 0.5 ft of topsoil will be required for a total topsoil volume
of 24.2 acres x 0.5 ft depth x 43,560 sq.ft./acre / 27 x = 19,521 CY
The cost to haul topsoil to the Materials Processing Area and Wash Pond:
19,521± cu.yds of soil demand
x $ 1.191 per LCY.
$ 23,249.91±
The cost to spread topsoil on the Materials Processing Area and Wash Pond:
19,521± cu.yds of topsoil x 1.215 (swell factor) = 23,718 CY
x $ 0.232 per LCY.
$ 5,502.67±
Ripping will be required in the Materials Processing Area and the Wash Pond due to
compaction by heavy machinery during operations; the slopes of the Center Section of
the Central Field are not anticipated to require ripping due to relatively recent disturbance
and no compaction.
x$
24.2 acres
589.34/acre
14,262.37±
$ 47,939± Total Soil Replacement Cost for the Initial Extraction Area of the Central Field,
the Materials Processing Area, and the Wash Pond.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page X12
6.4.12 EXHIBIT L - Reclamation Costs
Establishment of Vegetation over Affected Lands:
The demand establishment of vegetation over the affected lands will also diminish
proportionately with the planned extraction of the Tracts. For now, the total exposure is
estimated as indicated above to be 4.8± acres for the Center Section of Central Field and
24.2 acres for the Materials Processing Area and Wash Pond (see Soil Demand):
NOTE: The cost for seed is equal to the price provided in the 2023 Reclamation Cost
Estimate for the Two Rivers Sand, Gravel, and Reservoir Project, which includes the cost
of seed application; however, the costs are known to fluctuate seasonally — and are
estimates based on prior seasons. The seed mixture includes a substitute for mulch in
the inclusion of a wheatgrass hybrid. The Division has historically agreed with and
approved the inclusion of this hybrid as a substitute for mulch. The Optional Seed Mix
will be used if the Primary Mixture fails, but costs less, so that cost is accounted for.
These costs are as follows:
$ 1,789.70/acre± Preferred Seed Mix
x 4.8± acres
$ 8,676± Sub -Total Seed and Application
Assume a 25± percent failure and add half the expense back into the total for reseeding,
or:
$ 2,169± Sub -Total Re -seeding costs
$ 10,845± Excavation Area Re -vegetation Expense
Re -vegetation of the 24.2 acre processing area and wash pond is also estimated.
$ 1,789.70/acre ± Preferred Seed Mix
x 22.4± acres
$ 43,311± Sub -Total Seed
Assume a 25± percent failure and add half the expense back into the total for reseeding,
or:
$ 10,828± Sub -Total Re -seeding costs
$ 54,138± Processing Area Re -vegetation Expense
$ 64,984 Total Re -vegetation Cost
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 113
6.4.12 EXHIBIT L - Reclamation Costs
Processing Area Decommissioning:
Raptor has estimated decommissioning costs for the Processing Area. All plant and
equipment in the processing area is portable and would have more value that the cost of
loading and removing it.
Decommissioning will involve the removal of concrete pads for processing equipment and
concrete supports for truck scales and temporary buildings.
Three 12 -inch -thick concrete pads are assumed in the processing area with dimensions
15- x 30 -feet, 15- x 60 -feet, and 15- x 25 -feet. Demolition and removal costs are
estimated at $2.30/sq.ft. for 12" concrete pads.
The truck scale will have concrete supports with an estimated volume of 10 CY.
Additionally temporary buildings for the scale house/site entrance area and processing
area will have concrete support blocks with estimated at 8 CY of concrete. Estimated
costs for the concrete supports is $6.89/lin.ft. (of 1ft thick, 1 yd deep concrete slab).
Concrete pads: 1,725 sq.ft. x $2.30/sq.ft. = $ 3,962.33
Concrete supports: 18 CY x 9 lin.ft/CY x $6.89/LF = $ 1,116.18
The removal of two 6,000 to 8,000 -gallon fuel tanks located on -site for vehicle refueling
is estimated to cost $5,416.35 each, for a total of $10,832.70.
$ 14,193 Total Process Area Decommissioning
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
Page 114
6.4.12 EXHIBIT L - Reclamation Costs
OTHER MISCELLANEOUS COSTS:
Mobilization and demobilization costs are based upon the Division's estimates, which were
provided in their March 24, 2023 estimate at $2,978.
Demolition of Structures:
None. Building Permits for structures will be obtain where required from the Weld
County Building Department.
Please Note: Since there is no possibility of the applicant in fully reproducing
the Division's methods, utilizing similarities from past OMLR calculations is the
most viable and accurate means available for the applicant to derive
reasonable estimates of per unit costs and should result in estimates very
reliable with that of the Division.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT JUNE 2024
A REGULAR IMPACT [112J CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
TECHNICAL REVISION 01
COLORADO DIVISION OF RECLAMATION, MINING AND SAFETY
1313 Sherman Street, Room 215, Denver, Colorado 80203 ph(303) 866-3567
REQUEST FOR TECHNICAL REVISION (TR) COVER SHEET
File No.: M- 2022-013 Site Name: Parcel 124
County Weld TR# (DRMS Use only)
Permittee: Raptor Materials, LLC.
Operator (If Other than Permittee):
Permittee Representative: Garrett C. Varra
Please provide a brief description of the proposed revision:
Relocate the Materials Processing Area and Wash Pond, remove the conveyor, revise the initial
extraction area, and associated updates to the project timeline and financial warranty.
As defined by the Minerals Rules, a Technical Revision (TR) is: "a change in the permit or application
which does not have more than a minor effect upon the approved or proposed Reclamation or
Environmental Protection Plan." The Division is charged with determining if the revision as submitted
meets this definition. If the Division determines that the proposed revision is beyond the scope of a TR,
the Division may require the submittal of a permit amendment to make the required or desired changes
to the permit.
The request for a TR is not considered "filed for review" until the appropriate fee is received by the
Division (as listed below by permit type). Please submit the appropriate fee with your request to
expedite the review process. After the TR is submitted with the appropriate fee, the Division will
determine if it is approvable within 30 days. If the Division requires additional information to approve a
TR, you will be notified of specific deficiencies that will need to be addressed. If at the end of the 30
day review period there are still outstanding deficiencies, the Division must deny the TR unless the
permittee requests additional time, in writing, to provide the required information.
There is no pre -defined format for the submittal of a TR; however, it is up to the permittee to provide
sufficient information to the Division to approve the TR request, including updated mining and
reclamation plan maps that accurately depict the changes proposed in the requested TR.
Required Fees for Technical Revision by Permit Type - Please mark the correct fee and submit it with
your request for a Technical Revision.
Permit Type
110c, 111, 112 construction
materials, and 112 quarries
112 hard rock (not DMO)
110d, 112d(1, 2 or 3)
Required TR Fee
$216
$175
$1006
Submitted (mark only one)
E
E
--\----
-
•: _
4 1
111 _ 1
f
1
„,,,' .
N l ANl'
5 L
v...?..." E' o'er
C•
l
I I I
ale
/
L. 1
9�'SUN
_. ,t
•7.
I
_ y.. �,- _ _ ,�-�.� r /6", 4�..•
j r { �.• ar4 f ^'
. f Ai, t�J�•-,�- ',r - �1�[,c. _ r •••
,-. _
��. :r-s�!r 1 _ - ` �.� ' ���., '1 ,. .. ^�.�,•M�'L~�- - c -' .:.
' I �;
- (dot
- - y - :: I �'
SOIL STOCKPILES
STOCKPILING OF SALVAGED50g ABOVE THE
EXISTING GROUND ELEVATION WILL NOT
OCCUR IN A MANNER UNDERSTOOD TO
%. ��-- ' ' - - - ' - -
'-VIII
, '4'!�- -
I ,
"� -' ..: . •, .-
.__. .
MIGHT OCCUR WITHIN THE FASTING
..
1
I
I
{
-.
f,,,; ,r K + - .- - .� .A
- ... ' if . �' ali`�it:� ! �Ss` -":
.� _. -n
t. f I ,7.. '', ,..,.
' `-' ''� r -
�-
I
1
1
I
'+n
—
C E NTRAL FIELD
NORTH-EAST SECTION
1
FLOODPLAIN IT ISUNDERSTOOD AND
AGREED HEREIN THAT THEIR LONGITUDINAL
DIMENSIONS SHOULD EXTEND PARALLEL TOE
:.:11CIPATEDfLOULDExTY5UNlES51HEPIlE
NTENDED AS SHORT TERM STORAGE
I
•
1
i 1+ l /
I
r -
is tvtl' ri-'nf;Y SOIL STOCKPILE LOCATION
1 I
lcjQf OF SEASONALITY WHERE FLOODING
.HT BE MORE REASONABLY ANTICIPATED.
_
I /
I
by
�'
• �.
_
- ` - -
1
G U
W
- Iwl ,, .-.. . . •cot ,..-.c' •
---tiej4L r iris:
' '
NW FIELD =
, e
, .-
•
! e l
_..
41.04± ACRES
o
I
r 1
CENTRAL FIELD
162.57± ACRES
�-)
°
4
.,
"
f
if
: - .<..�r_he
•
CENTRAL FIELD
CENTRAL SECTION
1
8
GENERAL MINING hROGREsBioN
!
, .
It
o
1
1
NOTE THE EX TRACTION AREA SIZE,
SHAPE. AND FACE ORIENTATION MAY
(
2H:1 V CUT SLOPE /•
O
•
p
1
VARY FROM THAT PORTRAYED
4
I
1
m
INMTIAL
DEPENDING ON FIELD CONDITIONS.
1 i-
SW MATERIAL
\__ i=
AREA OF
I
o
EXTRACTION
PROCESSING
AREA ^ 18.4±
x CENTRAL FIELD
GENERAL MINING PROGRESSION •;
O
U e
1Cr
��
-OSSIBLE PARKING EQUPAENT
-- ' -
a
a
WEST SECTION 1
-- "
II
ACRES
-_____
:
STORAGE (SUBJECT TO CHANGE)of
SWIPE
,:1v CUT o'I
-
•.'
o�
�-
--
ox
= f:
I
r : 1
i Imo' _ s�
(
,
- _
i•\i;=..rII-I1rc1t1iJC
IiKQIH(1M� ii •
\
TOP P1PE64•IM 44
SW WASH POND
f. _ ` :_ - ,I
`
- 5 8 ACRES
---��.,. �.
- .,
_
' ..
y'
�' -- SOUTH PLATTE RIVER 1 ''•. w.: —__
1 .� - C►ir- - `,
t lam.
...L'.
'' ` ..., " • = I
' ''
I
. ,
�' ft .�
`t • LL�r t.. •
-_
r.. `
LEGEND
PERMIT BOUNDARY
tI
, ..e"" .�(. �:.�fr _ i _ — .c �+_ _'
PARCEL BOUNDARY
T•
/; u
rC.rr 7- T 1 -
_�. - �;� I
' J {rF �r
E TRACTION LIMITS
a
,SETBACK
•
,.� } l
V' l I
i �
-'- <' ; • 1 - -
r ` > ..
EXTRACTION
IONF
,
'.
.". - ...
V POINT OF ACCESS
-- .—_ _ ` M ilmin
- .. »... .....
e• '
�. 1
I .. _
_
`
KEYWAY
_ — - --- —.-vim '„ �_ ,...c.4 .�_ _
_.�.:
ROTES.
Dawn by.
Checked
SCALE. 1 inch = �G feet
RAC MATERIALS tit
Pmt, Two Rivers Sand, Gravel and
Reservoir Project TR01
203.61±Acres
Basins Total + 5.8±Acre Wash Pond
M. Thompson
by. P. E.
DATE: 22 February 2022
n WI sVial__
REN4DN" 29 Moy 2024
'•c`='
n__e mess --
Christensen
m.ele rt(ST) •••-••13
DRANO
C-2: Extraction Plan Map
R.O.W & Easements not shown from Exhibit C-1: Existing Conditions Map, ore obsolete or vacated
PAGE:
•.'
Exhibit
1 of 1
7
ILML
I
L
Latitude
40 3570.4
40 341Gr
40 342074
40 343489
40 339043
40 119404
40 141ri13
40 349774
LW 100
ar
It
ter Well Detail
*emit Number
13950.R•R
707
303414
304.R
20422
7 4
1787.R R
flc6I .I
t
1
I
1 1 1--j 11 I
Lo • hide Owner
104 /6'322 DOS RIDS tS I AILS WIN CO
•101770031
-tot 783461
SHARLE.ALVA1
VARRA COMPANIES INC VARRA. CAPRI. TTI
104 779183 VARRA COMPANIES INC IVARRA. GARRETTI
•104785991AFAR&elOiCIM, AGGREGATE INDUSTRIES
•1M 77 %ORINNATURAL RFSoURCI PAR1N1•RSt1t
$017041 110t0 Wall R, LtC (WHITE. MICHAft ft
-gm 761489 SARIN NATURAL RINGLIKE PARTNFRS LL('
is.
W
Peim.t Statue
Well Conetruced
Well Comuu.-ted
Well Camtructee
Well Conetrucioe
Well Conettucttd
Well Clnttnuted
Well Cnnatructnd
Well Committee
Caesir,ationDate Pitt tat
WI 111089
6/20/1955
11.214/1989
413n(1952
1!22/2071
rig i 7/ 1'27!'.
1171F1470
9 74/7014
General Purr
General Poi .. lie
Central Pere*
Genre Pvrpoee
MenttonngJObte tvAtlon
R+elaentral
General Pulping,
General Purpnert
NW FIELD SURFACE WATER
AREA = 34.991 ACRES AT
ELEVATION 4675'
the
IN 11,0,1
bn aUa1
In,• Ilan -- _
Ia.8atlun
Munrtonn>i/Sampshng
DriPleetec
Nnyatlnn
Induetnai
l-�
NW FIELD= 41.041
ACRES
J\-j"
CENTRAL FIELD = 162.57± ACRES
CENTRAL FIELD SURFACE WATER AREA =
151.38± ACRES AT ELEVATION 4673'
••••••••••
Nrr_II
LEGEND
PERMIT OOUNDAR Y
PARCEL CCUNOARV
EXTRACTION (.ANTS
SNOIE VW TER WELL
PIEIOYETER WATER
LEVEL WELL
STATIC GROUND
WATER LEVEL
200 FOOT LINE
000 FOOT &PIE
POINT OF ACCESS
Cr APT
11.11
I
0.
`VC,
1°01 .A.SOIL
•-ea,
PMCCT:
Two Rivers Sand, Gravel Reservoir Project TR01
HOLES: ---
203.61±Acres Basins Tota!
Craven ID y.
u Thompson
C11eeked
y. P. E.
Christensen
xAtE:
I With - 300 feet
' + :-�,
•'
DATE:
22 February 20ee
y
29 Aioy 2024
"Asa:
Exhibit G: Water Information Map
PACE.
_j___ co.'.
ad -
SOIL UNIT 3
mews•
•
1 t
SOIL UNIT 3
.1 4,‘‘...L._
r
SOIL UNIT 52
•
/--
•
4 `
NW FIELD =
41.04± ACRES
NW FIELD SURFACE WATER
AREA = 34 99± ACRES AT
ELEVATION 4675'
-
i
•
•1.
r'
•
r i
UI
'Dr
tart.'
r3,
4
j.•, `� /
. P J �
SOIL UNIT 3
-
30(L UNIT 3
•‘•
A
ti
v
1
4.ar, 1.
1i3
CENTRAL FIELD = 162.57± ACRES
CENTRAL FIELD SURFACE WATER AREA = 151.38± ACRES AT
ELEVATION 4673'
`
.7-
.... . . .. __. - - - • -
•
-
-r
...--.y•: -. r•
•
•
• ..4.14atSde
- --.:.:'z
a
4
l,.1 t7,:
`-..! •'•.i••` -tr 4P':1• ^-n
1t ..r --"IT
La tsaa I,
r-....r......M-w...�.+.�. �.� �_
1ti
J I' I
i •fir .c !4
--
.40
r
•
£' r ,,-tasiks,tom.,✓•-.tC. .ry r .
,-.
-% tot_ !,..
,....,
t
1 - -
1
aro
LEGEND
PERMIT BOUNDARY
STATIC GROUND-
WATER LEVEL
BASE OF PIT
EXTRACTION LIMITS
SOIL BOUNDARY
RSCOS ��A l u
,,,,,` _,
PROECt Two Rivers Sand, Gravel Reservoir Project TROT
J
300 feet
Notes
Draw„ by
CheckedALL
mch =
lhompsan
by P. E.
A>E 22 F••ru•r 222
?_ 0 3.61 ± Acres Basins Total
M.
Christensen
'- " • • ' 24
Mat, «1M•AO tlli.
.l.s. IM10Y•Wi
DRA"""G Exhibit I/J: Soils and Vegetation Map
PAGE 1 or 1
.�. '• "'
treat—
i
Drown by.
M.Thompfon
i
MAP 1O1 WAUINS TLC
wp w. PEW
/!a[b..aSS 0.1.
a:,.1041. .t,) .I6-0111
soar
CrI0S.SISSMIELI PEN,
,-
—a• — « .. +.«•
r0
— _ ....r..r�.a✓-
-- .rte
-J dam. -_r'
-
N •. .. r 1 PS'S* . - M. ✓•pe - se SA r-
..... SP SP POP «SA .. w•• .,rte .eAlt .•
r
..Y:• •.._. -.•.•.. •
• -. •.. .a..- .�-N.•-.� .r �•.-. .. IS�
,,,...........•-.w .. -- ... ---.� -.... Pe .. . S - ...• .r ere' ••••••
_.. le -
Sr'_, _Jv-"i-s-.� -:r. — .. .er aP .-.,q — K...: 7_,,,./........
Y
MP. Se
----
NW FIELD =
41 04± ACRES
CENTRAL FIELD
WEST SECTION
SW WASH POND,„.----
- 5.8 ACRES
NOSS .7 SIN.
NOTE. THE E.XTRACT,ON AREA
SHAPE. AND FACE ORIENTATION MAY
VARY FROM TrWT PORTRAYED
DEpE'1frr, ON FIELD corn TIONr
LNEFtAL MINING PROGRESSION
"'plc'. Two Rivers Sand, Gravel and Reservoir Project TRO
CENTRAL FIELD
NORTH-EAST SECTION
A, rt',rd
CENTRAL FIELD
= 162.57± ACRES
CENTRAL FIELD
CENTRAL SECTION
°"ASIC Exhibit L: Financial Warranty Map
NOTES:
203 61±A B T t I + 5 8tA W h P nd
2H:1V CUT SLOPE
cres assns o a . cre as o
4
SEPSIS
t
J
Chcckcu
by P. E.
Christensen
1
1
1
1
LEGEND
PERMIT BOUNDARY
PARCEL BOUNDARY
WCR 396 SETBACK
EXTRACTION LIMITS
DIRECTION OF
EXTRACTION
WESTERVILLE SOIL
STOCKPILE
V POINT OF ACCESS
FIELD SECTION UNE
KEYWAY
SCALE: 1 Inch - 2O0 feel _
DATE: 22 Februory 2022
RENSION: LL May •alilimalialiden
PAGE Or
720 SOUTH COLORADO BLVD.
SUITE 410 S
DENVER. CO 80246
303.757 3655
January 19, 2024
Mark Oberschmidt, PE
City Engineer
City of Evans, Colorado
1100 37th Street
Evans, CO 80620
APPROVED
CITY OF EVANS
MARK OBERSCHMIDT. P.E.
CITY ENGINEER
05/29/2024
RE: Floodplain Development Permit Application
Raptor Materials: Two Rivers Sand and Gravel Project (P124)
Dear Mr. Oberschmidt:
On behalf of Raptor Materials LLC (Raptor), this is a letter documenting that Two Rivers Sand
and Gravel project does not cause an adverse impact to the Big Thompson and South Platte
Zone AE floodplains or floodways and is intended to accompany the attached floodplain
development permit application (Attachment A).
Applicant and Design Engineer Information
Applicant: Raptor Materials LLC
8120 Gage Street
Frederick, CO 80516
303-666-6657
Garrett C. Varra
PROTECT DESCRIPTION
PURPOSE
Engineer:
RESPEC Consulting & Services
720 S. Colorado Blvd., Suite 410S
Denver, CO 80246
720-775-6408
Wyatt P. Foley, P.E., CFM
The Two Rivers site is about 409 acres, consisting of mostly agricultural land south of the Big
Thompson River and north of the South Platte River. The portion of the site north of the Big
Thompson River is mostly undeveloped with trees, and other natural vegetation. CR 396
divides the site into two sections, and 54th Street Road borders the northernmost edge of the
site.
The proposed use for this site will be the extraction, processing and stockpiling of sand and
gravel materials reclaimed from within the site, as well as the truck scaling and sales of these
products. Of the 409 acres that comprise the site, approximately 204 acres are currently
permitted to be mined. Within this 204 -acre area, the material processing and handling area will
occupy approximately 18.4 acres. The remaining approximately 205 acres are currently
providing setbacks from the rivers or other infrastructure, contain wash and dewatering ponds
or have not been otherwise planned at this time for extraction and will be utilized as necessary
for operations, but in many cases untouched. The materials processing area and the wash pond
shown in Figure 2 will each be excavated to approximately 8 feet below existing grade, and the
extracted soil will be added to an existing stockpile in the northeast corner of the site.
Extraction is expected to extend for approximately 25 years (demand -driven) in small
footprints with progressive reclamation, as detailed in Exhibit E of the Two Rivers Sand and
respec.com
TWO RIVERS SAND AND GRAVEL PROJECT
EAGLE MATERIALS - NO RISE PERMIT
MR. MARK OBERSCHMIDT 2
JANUARY 19, 2024
Gravel Project DRMS Permit Application. The proposed post -mining land use is lined reservoirs for water
storage.
LOCATION
The Two Rivers (P124) Sand and Gravel project is located within the City of Evans and Unincorporated
Weld County. It is located within the southwest quarter of section 34 and the southern half of the
southeast quarter of section 33, township 5N, range 66W; and the northeast quarter of section 4,
township 4N, range 66W, and the west half and the northeast quarter of the northwest quarter of section
3, township 4N, range 66W. Figure 1 provides a vicinity map and Figure 2 provides a project location map
with excavation, processing, and stockpiling locations.
1A Atter l'iit!e 040‘.
Two Rsimn kv Pnc Pnyetl Vban11y Mop
mutat 102J
M
Whe
Figure 1. Two Rivers Project Vicinity Map
MR. MARK OBERSCHMIDT 3
JANUARY 19.2024
Figure 2. Two Rivers Project Location Map
EFFECTIVE FLOODPLAIN INFORMATION
IMPACTED FIRM PANELS AND COMMUNITIES
The Flood Insurance Rate Map (FIRM) panel numbers impacted by this project are 08123C1706F,
08123C1707F, 08123C1708F, and 08123C1709F, effective as of November 30, 2023. The excavation,
equipment, and stockpiling locations are located within the City of Evans, Colorado (FEMA Community
numbers 080182 and 080266, respectively). The effective FIRM panels are in Attachment B.
FLOODPLAIN DESIGNATION
The project is downstream of Effective Cross Section A of the Big Thompson River on the FIRM. The
floodplain type is Zone AE with floodway. The effective FIRM shows a split flow that begins southwest of
the intersections of Weld County Road 54 and South County Line Road called the "CR 13 Split". The CR
13 Split begins approximately 1,500 feet southeast of Effective Cross Section A and reconnects with The
Big Thompson approximately 1,250 feet southwest of the intersection of County Road 54 and County
Road 15. All work will take place in the Big Thompson River floodplain.
EFFECTIVE HYDROLOGY
The effective hydrology was completed in March 2016 for the Colorado Water Conservation Board
(CWCB) as part of the "Colorado Hazard Mapping Program: Hydrologic Analysis Technical Support Data
Notebook for the Big Thompson Watershed (HUC-8 10190006)" report prepared by AECOM. Table 1
shows the effective peak discharge within the project limits used in the HEC-RAS model.
MR. MARK OBERSCHMIDT 4
JANUARY 19.2024
Table 1. Summary of Available Peak Discharges
Peak Flow Source
Return Period Peak Flow (cfs)
2016 CHAMP Report
100 -year 22,247
HYDRAULIC MODELING
CWCB EFFECTIVE MODEL
This model was developed using HEC-RAS 5.0.1 in 2016 for the CWCB as part of the Colorado Hazard
Mapping Program and serves as the basis for this analysis. The model spans from the Big Thompson
River at South County Road 93 in Loveland to the South Platte River confluence. The Two Rivers Sand
and Gravel project lies between Cross Sections 10253 and 3041 of the Big Thompson River reach. Table
2 summarizes the general hydraulic parameters of the effective model in the project reach.
Table 2: Hydraulic Model Parameters
Parameter
Boundary Condition
Value(s)
Known WS (D/S), I-25 Junction
with Middle Big Thompson (U/S)
Manning's "n" in Channel
Overbank Manning's "n"
Contraction Coefficient
Expansion Coefficient
0.03
0.05-0.08
0.1 (0.3 adjacent to crossings)
0.3 (0.5 adjacent to crossings)
DUPLICATE EFFECTIVE MODEL
The duplicate effective model was migrated to HEC-RAS 6.4.1 for this floodplain analysis. A discrepancy
in the GIS length vs. weir length for lateral weir structure 5310 in reach "SP -1" on river "SP -1" was
corrected to allow the model to run. Duplicate effective model output from HEC-RAS 6.4.1 was compared
to output from the effective HEC-RAS 5.0.1 model to ensure consistency. No changes were noted. Model
output and results are in Attachment E.
PRE -PROJECT MODEL
The CWCB Effective Model was updated with drone surveyed topography conducted for the Two Rivers
project area on February 27, 2023. Topographic information for the remainder of the model reach was
updated with freely available LiDAR produced by FEMA (2018 3DEP East CO Block 2 QL North, 2014
USACE Post Flooding, and 2013 South Platte River and Denver Post Flood) through the CWCB. The LiDAR
and drone survey have sufficient resolution to produce contours accurate to +/- 0.5 feet All information
is in the North American Vertical Datum of 1988 (NAVD 88) and the Colorado State Plane North
coordinate system, which are also the datum and coordinate system for the hydraulic model.
The updated topography was observed to capture channel shifts along the project area, such as at CR
396 (Bridge 5817) on the Big Thompson and was used for both the pre- and post -project model runs to
perform a one-to-one comparison between the effective and the post -project models.
POST -PROJECT MODEL
The post -project model was created using the pre -project model as the basis and updating the project
area with the proposed southwest materials processing area and associated equipment and stockpiles;
MR. MARK OBERSCHMIDT 5
JANUARY 19, 2024
R
ESPEC
the southwest wash pond; and the northeast stockpiling area. The following updates were made to create
the post -project model:
MANNING'S "No VALUES
The fields that make up most of the site area consist of mature cultivated crops as well as small stands
of brush, trees, and woody debris. For this reason, a Manning's n value of 0.06 for the open fields within
the project area is more representative of the site conditions than the n of 0.05 used in CWCB's effective
model. Manning's values for the field portions of cross sections 3041 through 10304 were therefore
updated to 0.06.
The equipment proposed to be placed in the materials processing area consists of a hopper, screens, a
wash plant, and a sand screw; this equipment consists largely of voids. Additionally, multiple dynamic
stockpiles will be constructed and moved within the processing area. A Manning's value of 0.1 was
applied to the entire processing area to conservatively represent the reduction in conveyance posed by
the changing material and equipment in the area. The side slopes of the proposed excavation were
assigned a Manning's of 0.03 to represent the excavated slopes. The cross sections that intersect the
future materials processing area (8552, 8597, 8628, 9149, 9458, 10000) received the updates.
Cross sections portions that intersect the southwest wash pond (9149, 9458, 10000, 10304) were
updated with Manning's values of 0.03.
PROJECT AREA GEOMETRY
The following geometry edits and associated affected cross sections were updated in the post -project
model.
Excavation:
• SW Materials Processing Area: 8552, 8597, 8628, 9149, 9458, 10000
• SW Wash Pond: 9149, 9458, 10000, 10304
Stockpiling:
• NE Stockpile (includes entire volume excavated from the SW Materials Processing Area
and Wash Pond, plus a 20 percent bulking factor): 4569, 4874, 5226, 5542. Because the
existing top elevation of the NE Stockpile is above the Effective Base Flood Elevation,
the added volume did not influence the post -project model results.
Ineffective flow areas were set for the materials processing area and the wash pond at the lowest
elevation along the excavation perimeter.
NO FLOODPLAIN IMPACTS
The Big Thompson and South Platte Rivers have FEMA-regulated Zone AE floodplains with effective
regulatory floodways. The entirety of the Two Rivers site is contained within the floodplain shown in the
pending FEMA Flood Insurance Rate Map (FIRM) (effective November 2023), with most of the site located
within the floodway. All proposed 100 -year water surface elevations (WSELs) are either equal to or less
than the pre -project conditions. No decrease in 100 -year WSEL greater than 0.3 feet was observed. Rises
in WSEL observed at certain locations between the post -project and effective models occurred due to
updates in topographic and Manning's "n" values.
/
MR. MARK OBERSCHMIDT 6
JANUARY 19.2024
The table provided as Attachment E illustrates the 1 -percent annual chance WSELs for the pre -project
and post -project conditions. The resulting proposed floodplain boundaries and profiles are shown on
Attachments F and G, respectively.
ENGINEERING "NO -RISE" CERTIFICATION
This is to certify that I am a duly qualified engineer licensed to practice in the state of Colorado. It is to
further certify that the attached data supports the fact that the Two Rivers Sand and Gravel Project will
not impact the effective Zone AE base flood elevations, floodplain elevations, and floodplain widths on
the Big Thompson River. Therefore, this project does not adversely impact the Big Thompson River
floodplain.
SIGNED
DATE
Note
1/19/2024
Contact
Information:
RESPEC Consulting & Services
(720) 775-6408
720 S. Colorado Boulevard
Denver, CO 80246
On behalf of Raptor Materials LLC we are requesting that a floodplain development permit be issued as
we have demonstrated that construction of the proposed gravel mining pit will not raise the 100 -year
water surface elevations along the Big Thompson River.
Thank you for reviewing this no -rise certification letter. If you have any questions or need additional
information, please contact me at 720-775-6408, or wyatt.foley@respec.com.
Sincerely,
RESPEC Consulting & Services
Wyatt P. Foley, P.E., CFM
Project Engineer
Attachments:
A - Application for Flood Hazard Area Development Permit
B - Effective FIRM
C - Site Plan
D - HEC-RAS Output
E - Summary Table of Water Surface Elevation Changes
F — Proposed Floodplain Maps
G - Floodplain Profiles
ATTACHMENT A
OWNER Garrett C. Varra - Raptor Materials LLC
ADDRESS 8120 Gage Street. Frederick, CO 80516
FLOOD PLAIN DEVELOPMENT PERMIT
APPLICATION
PERMIT No Rise DATE
PHONE 303-666-6657
GIS ®I
Evans Colorado
CONTRACTOR N/A PHONE
ADDRESS
PROJECT LOCATION/DIRECTIONS (40.348174, -104.776631)
PROJECT DESCRIPTION
SINGLE FAMILY NEW CONSTRUCTION CHANNELIZATION
MULTI -FAMILY SUBSTANTIAL FILL
RESIDENTIAL IMPROVEMENT (>50%)
MANUFACTURED IMPROVEMENT (<50%) BRIDGE/CULVERT
(MOBILE) HOME
NON-RESIDENTIAL REHABILITATION LEVEE
X OTHER - EXPLAIN Sand and gravel mining pit
FLOOD HAZARD DATA
WATERCOURSE NAME Big Thompson River
THE PROJECT IS PROPOSED IN THE _x__FLOODWAY FLOOD FRINGE
BASE (100 YR) FLOOD ELEVATION(S) AT THE PROJECT SITE 4684 - 4691.5 ft
ELEVATION REQUIRED FOR THE LOWEST FLOOR NGVD
FLOODPROOFING NGVD
SOURCE DOCUMENTS: REPORTS/MAPS FEMA Firm Panels 1706F, 1707F, 1708F, 1709F
(Pending - Effective as of 11/30/2023)
PROPOSAL REVIEW CHECKLIST
Site development plans are complete and depict flood hazard data.
1 Engineering data is provided for proposed map and floodway revisions.
__1Floodway Certification and data document no increase in flood heights.
Subdivision proposals minimize flood damage and protect utilities.
Lowest floor elevations are above the base (100 yr) flood elevation.
Manufactured (mobile) homes address elevation and anchoring requirements.
A flood -proofing certificate certifies flood proofing designs.
Other:
PERMIT ACTION
PERMIT APPROVED: The information submitted for the proposed project was reviewed and is in compliance
with approved flood plain management standards (site development plans are on file).
PERMIT DENIED: The proposed project does not meet approved flood plain management standards (explanation
is on file).
VARIANCE GRANTED: A variance was granted from the base (100 yr) flood elevations established by FEMA
consistent with variance requirements of NFIP regulations Part 60.6 (variance action documentation is on file).
Flood Plain Administrator's Signature Date
Comments:
COMPIANCE DOCUMENTATION
MAP REVISION DATA: Certified documentation by a registered professional engineer of as -built conditions for flood plain
alterations were received and submitted to FEMA for flood insurance map revisions.
FILL CERTIFICATE: A community official certified the elevation, compaction, slope and slope protection for all fill placed in
the flood plain consistent with FNIP regulations Part 65.5 for map revisions.
ELEVATION AND FLOODPROOFING CERTIFICATES: The as -built elevation of the buildings lowest floor was certified as
NGVD; or the building's floodproofing level was certified as NGVD; by a
registered professional engineer or licensed surveyor and is on file.
CERTIFICATE OF OCCUPANCY OR COMPLIANCE ISSUED ON
Date
ATTACHMENT B
%%rid ( cruet.
I ntnccerporatcd %ryas
0tf0266
N% rid ( nuntA
hincarpuratrd %ryas
t ONO !t'+6
P124 Project Area
FLOOD HAZARD INFORMATION
!H f+M /e110et coy *Twin 11400 MO !Meta au; rots cunt PQM IASI
TNNE *NCORMATION Di WCtf D ON THIS MAP AND Stlo*ONTIK
DOCUMENTATION( ARE ALSO AJAi14111t IPS D4GtIAI U*MAT 41
M1TP5: MW FIMA GOV
SrEetAt f}000
► AZARD ARIAS
O MER AREAS Cu
8000 kAlt,0
011181
MILLS
WORM
STRUCTURLS
S
wiliest flef(���Roost
Etm ila OM
With BFf O� Delti+ . .r 4r' Ae 4.:ei4i.
Ilepiettxy Ftorduter
0. 2S Mani Ck.tocc F;oad t?at uc Antes
of 1% Sonia, mace f Wad seta isle
depth Ins titan oat toot 04 r4 deslias
aims of less Mon Otte wUMM' ISO
tent
FUiei , 4Mtleits 1% Annual
' Chat RAS Naomi
�r i. Ales rill ASKS Find Motdue to Levee
er + Svc Notes
Sits wsib Floor' Risk Out to L!neet
NOSCINIB4 Area of Munn' Hoot Marard
Area of Uwkteenunto Food Nataid
- - Channei, Cvhtci. or Sterns Setter
•••. tent She. of Fioo4rf4tf
.. 1
NOTES TO USERS
O. .'oll'+ rn' r►: one SS Sc ra'! -.r* Aw Nn a OW. ...ab.:+N+1. atm- sea w••
.et $ 410 - t*cq Pant es .et e...rr Alit me tr e.et. e**rd I+a t.se b taw reeeMu r se
WM• r esat ae ritee *sir 0101, risen mess y +t. Pt M► eagy.4 r•+ .a rn is s:santr r
trketasr.e,M► lJt! t**Jtt'e s nal err ►[U► ►we sa.o antes rave eat .+
Peps etas rat.. ♦.e— Sea 'es '.'.A re Inn'. Pee .r.w Y Owe ['mar ♦ IVC
~SS MIS SINS see !Vr .fie :• 4.+. 'at Vet M 'ew auaee :a► M flews! Of Sat
•0* Via, I t+e+ter.►
f.V'••e✓•r. r••aet% WS r —_-. r7N/ Meters *us wow . bee•.n 4AI t4 Ilan,. • ra .. is parr ♦e
Pm wow* r+*sa '.a.. +.er. IN, a steed Aeatt Mfr • R. 0. wet w lean Case r v,.. • -ea seen
Nn..
•,7 vwnre, pas to rw7ra mite •r w 00 VMS ►avwew tMt SSW • vs Ins
'e alb*.•. a ea/ a s_ .c . ae..enr . M ern►.***, PISS SP aft --rig .rr•. w gap Om taw
rum* Wham.* P'a ea r • msansatn
bpo ten* wewwnr.- pimps pm em read a4 ass *foe ti %MOW D M Wen Willer AIM
t'4 «a .per era. Dewy% A a a tars AC Osiers. *St Ara ae.t OMreeere., nn err se
wan tc%..e..•' see* Irge.o ere. awn PUT
SCALE
A
sc-Iili•
Weesolionanno Miseiranit .tes. eswopesp.iw«USe
,t..rn., lae l*e t -S Vietrsr ir.a
1 Inch a 500 feet
1:6.000
0
SOO
000
,7A 250
PANEL LOCATOR
meseh
500
WO
fa Nrtt
�W
National Flood Insurance Program
NATIONAL ROOD INSURANCE PROGRAM
f LAM) 11 •
WELD COUNTY. COLORADO
rem 1706v 2250
hart 0te Cot
MUM
00.14:
*
CdfaMtssin sta ea AVM Carr(
Ira
Stele
s
i0
tatl000 FT
1u000D 62
w
- a� Rlt mint% a
41 %
tittt
(I!1' III put elt%l I.
• tihtt•(t.
I.
t
P124 Project Area
lQNt At
sts
k
I
reltr—neer 1t
at
11% all t.fm
n8411 h:
-2 ► s
..Men•. w
"Or N
C0" 20' -
'or ar IC.r
Meld ( aunt.
t aincarpflratil
Area\
OHO: e,(,
FLOOD HAZARD INFORMATION
SUM RQ0T VS$011801.0511.6111.1100 roa nOrrt PASUAWT
li I N ORMAT11fN DEPICTED °NTH'S MAl • -so., . ',MIRK
U0C1Mf *40001 ARE ALSO AVASAtif IN D$G4141 Mr>*MAT AT
r+riPS• 'MSC FEMA coy
i9EClltl ROOD
1t4ZARD AREAS
OTHER AREAS OF
8000 HAZARD
OTHER
AREAS
GENERAL
STRUCTURES
tester.;
PICA
Wctfsout Base Rood Elevates E}
WW1 BFE or Depth .
Regtdery Floodway
1 •t •t:
0.2% Annual Chaoer Flood !tar ird. Areas
of 1% an+wat eaast°. !1044 *MI &verly e
depth less than ofte fp0t Or with drainage
fleas al less titan one ?pudic mat
Future Conditions 1% Annual
Chance Flood Hazard
Area with Reduced Flood Risk due to Levee
Sec Notts
Arta with Flood Risk duo to luta of Minimal Flood Hazard
Arta of Undetermined Flood Hazard
Channel. Culvert. or Strom Sewer
. • • ' tcvltt. Dike, 00 Floodwall
NOTES TO USERS
w %wide +v am fir. New art now ones Pa .ima vete as a
•• illti wets.. tem ins* t! Owen an bV tY was ►Wr, sea t•w tf new meat s•
Se I• tt•.t woo ir 01~.art ♦ tsy peas -a. * •l % P'••••••••W Worst sP'•••••••• s tarn 1
it'+taM. Mir .1417` . .+t a nog Of ITua X, am Nle VMS :ran . * *t
Mos tins fivon.. Valli sea Ma. .,nwvil t•vi••1►a.. s..4 t"+w $1 Welt throve a ♦i.vi4
"tape %A! Ma v*s- age ata N+• .LIP titre. M+'eM a.'+o.O :sr e1 c uRa• atoms
&ea ten tft SOS
Ces "01 M•osn nr M f AY Son n was • ►.••stY Pa tsn Illatetfl II vise llir
▪ osam • ►.a4 '-we ear ti '"AM a to w r t • f ..e OW %Oa Ca a »► 0,4460e Wain
rose..
1 � rt• r►t ..e Wane!!.' Win war w .5 P to w, lI Stit %____t fl
Y arse • t7-- atans t ands .• .ti tone n••q Sat Me yea MINN ♦ tss M tike
tag : Mean "rpm. •.%:40n
t+i.it to1. Hump anon AM .. ►aet .+t wt.... bele cm, 'sari' t eat wee Lea tea. r inns
Zv rd tea Se Sim* A Mot tw.e•', Ori t- ... n►. 01W Mat •nt rassiser, seat .u.- as
4.1vvi. W%Iaa twelve • Copra. 4,r 1St fit t
SCALE
A
ff�f�cilr
ti•trcialt •`►rrwr •.t -.L VW to, :?1 . a. • .f/. tat
1 lack 1.1500 het
0 500
8 125 250
PANEL LOCATOR
000
2 OM
nreltn5
500
ales
.1
J
r.
re
^^O
4.t.
C
C
Ct
it..
N
C
00
t1.
C
O
CO
Z
NATIONAL fLOOD INSURAla PROGRAM
Room t1KSal+WICE Rai MA '
WHO COUNTY, COLORADO
wwt! 1707.. 2250
COIMUNITY
. era CV) Ia
t+i . D COV•Ti
WACO Me Spa
UM) Mr ro•
080:1*
L - .•••Ch.-
P124 Project Area
%%Chi ( Minh
t .unturlulratrt1 1rca%
o$il;rd•
t2.1. :tS i1 SS%t?'a
FLOOD HAZARD INFORMATION
11MN UPMT red onaan LEGCMG as NM OM PM Mil 1111!1 M SIN
itME PNFO 1a,1APION Df PICR O ON THIS MAP AND S Utz TWG
DOC1MEMifNk1 AM ALSO AVAIL11U IN DIGLIAL FORMAT Al
NTTPS: -MST; PIMA GOV
t
SPECIAL 41000
RADA D AREAS
OTHER AREAS 0
41000 sA ARO
as
011401
ARDS
GV411tAt
STRUCTURES
without Base flood iknOOR
WO BFE of Depth
Regulatory floodway
0.2's Annual Chance Rood Natant AMPS
of l's Gnat al two nod wiT1 Mtge
depth less than one foot of valh drMmafl
areas o1 lets than arse square mile
Future Condauont 1% Annual
Chance Flood Hazard
Area 1sith Reduced flood Risk due to tevee
See Notes
Ales *Rh FIOO0 Risk due to Leven
Anea of IRS a$ Rood Hazard
AIN of UMtte+ln,taed Flood H.I,atd
t ,.
Channel. Cv►rrrt, or StwA+ Sevier
n u _a• .. w.. , 111"101. Out. Of elf
NOTES TO USERS
to •1.••a.•" ►K ••••••ra aW's as tw1 —.ar* Na W. 'SW. •wata cn•.aa• ••a• Ae a••
•e 1 AM +ebd'g aa•n .rna"• Ae WS. •1t M• 4 •ta • en Pere ••w a .•o•• in" . r.•
•ate••• • sag Ana Nom. M. MWSW •••••• M Me •t W aaaae•.1 •••e •ei•.YZ •.. ler• •o
I srr.i lM Wi. . 1*1 1.b/:ni•' r .W •. 'Pa •wt •••n PInteal Cale nave a
Ss rm.& ♦•.• •-.a•••• seta -m►. .M.••• r -s.. *sad ♦•h-. r Wil► <r••• • litre
'Sate SLJ. ISA •••!!f. IOW exas t• -. -.•r Para to to nag :O IS Win tart?
e•..1• M +,, .•ee••
f,NN"we. er.wv` Ire r^ •y to t fiY pm "cW We. • .nn Oq• et, •asst•. M••• e as a
h••M• r•a11 M•• l•••M wet to want t••t•t sari" r• t flee ►Vy i..w Carna a a.• •..ire• ►•••t
Se
1Mr nwrvr, at SPIVS ++a win .ar n r • ms •tum yam AMA'.Iw /rsllem
11 •..A..- .•e r 'tee r.N.n q ra•Y• a ••.• t•••we.•► WOES tar •rryw• r •. ••a a•e p!••.
•i•A$ tn_ ao P.•1i4.• W • l" hall apt
boas nab S•.n+ar N. an M ►ter a•a Ian.we Me•. ti la. P— 141100 air nth 1 Mme•
W4 .. sea •le slog A *NW Cars s e•CG braan» ass spa •r►• ockawa 1 , a s -n w a..
%e.%en Ana,. WOW. "RIO. gal aai•.1 Y4
SCALE
A
a � Lea M* -'a a u. tit bra trip, % n* A.w •. taw.•• 1St
1 inch • 500 het
1:6,000
PANEL LOCATOR
E
(L-
a
ft1 v
U
ret
U,
C
Q
2
LL
C
O
CO
2
NATIONAL FLOOD INSURANCE PROGRAM
a. _
WELD COUNTY. COLORADO
toe 1708 er 2250
ta011Mt�01T1 ranfi PAM 1 S4MIX
avant cm of
SEW Catfin
Wm: IOM •
SOli MW •
7ru.ee Pte 1
•765000 Ft
1360000 Ft
40` VW 45
ma K 365
etd t uuei
t ainforprwatctl
Mill 264t
tiz
ft"
City of IT ant la
1 ile91R.
1/4
..-- "sr", N
•—'Yta a N
-sr4 t.
40 IS' 45'
In* *V Or
FLOOD HAZARD INFORMATION
1101100aTP0aalINAMIflfOtMD AMD Men Pmitt Wei
itlE tti<OkdAl ON DiN#C1'ET►'Nt r $4AP A$D S,t46
IOCIPMEt4IAVION An ALSO AdA6LAiiLk Iry 0iGt*4 fM$MAt At
HTTP5: ,'MSC f EMA.GOV
SPECIAi FLOOD
HAZARD AREAS
OTHER ARIAS Qi
ROOD RAZARD
Ollet
ARIAS
iElse flood ERT44 *e (8a}
With BFI a Depth s,.b'. M L,; IP
"keit Regulatory Ftosdusay
0.2% Annual Mos Reed Nano , Areas
at 1%Annual 'W MISMvttaaver*
ter tess t*an ass net vita Manny
arras of lots than one want nude
future Cambiums 1% Annual
Chance Flood t+azard
Area rttth Redssced flood Risk due to tens
See Notes.
;a►" Area teal$ Flood Risk dots to Levee
Area of falenimai Flood Kazan)
Area of Uneetermcned Flood Hatatd
-- Channof- Cohen, Or Sturm Sewer
GENERAL
STRUCTURES • tent. Otte. oo Aoadwatl
NOTES TO USERS
ow Stew teta soma Secas Wow twat wow Yaw moon spots pops stain aS
PO "VA sae, tom...0 elute- h same ale eat► 16, Mh wale IPM tna r t*. flew* S• Pa
lain ► *IA "Mberill We . awn Oa .4, r'S W W an•q+ar ant +Moen tt inawbair a
I :MEAN 400 74 mot, 1W W rtaa +ti*at Mita ins Cans chat a1
ant• ••aqe 41r*.fps Lam Sea MAy aaal•1. 1 Oaka, asset t acv.. a/ Mae Owe • have
` .tree ad" tataptt net is ran to r:a we Us'. M else ;area :a- be aceet i an,
sans lotn 'PS es
Cewwvasea ws e^t q Slues VS pins 'tam eta' • teen test •$ TIP met al war a
,w tuna ady awe Twee tsar 4 m ai.. a +. ash tan r. r Cale trey i..r • Ca M — ..,w w
aaaa
PI traMA n sway a gm 40P.R- Nat n n t LOa as recto *alt Saar a7 IPS 1lllOr
A Stator nimbi •aYMta.e 4 ►arWYe w M wwa"y' tca•at ISO ..term SR K iI aaMt...
Saco t+/ww Pmpam ar • atOAM a=
Mr ^aI anew rt' A .w ate PS* mai se..a t•.e ra. beau.•• ►a.we rvtw caan aelat • San
:CV rd egos a scree 04 YW Cane rot bins* awe 2041 w 4aaa.aywa a-Sw.-• a•
lee bnut..a raw. Naar* •t►t. =tat Ct'
SCALE
A Woe rat ttt-a- tw Minoan ttawlt itaw tint tent *s-- awn teat
t.c_aMwtarwtt a4$Srob•n. Igl as
1 Md1aS0O NI 1:6,000
0
1,000
0 125 280
PANEL LOCATOR
SeC
me
1SW
mINEMMT
h
NATIONAL FLOOD INSURANCE PROGRAM
• .
b.0 WELD COUNTY, COLORADO
Oand p.,.1ns., L
i
c
O
owe 1709 CH 2250
CO NIIP Y NUMOet net SttRTlT
ram oat Oa am me
•
ATTACHMENT C
LEGAL DESCRIPTION:
PARCEL 1:
THE W1/2 OF THE NW1/4 AND THE NE1/4 OF THE NW1/4 OF SECTION 3, TOWNSHIP 4
NORTH, RANGE 66 WEST OF THE 6TH P.M., COUNTY OF WELD, STATE OF COLORADO
PARCEL 2:
THE NE 1/4 OF SECTION 4, TOWNSHIP 4 NORTH, RANGE 66 WEST OF THE 6TH P.M„
COUNTY OF WELD, STATE OF COLORADO
PARCEL 3:
THE S1/2 OF THE SE1/4 OF SECTION 33, TOWNSHIP 5 NORTH, RANGE 66 WEST OF THE
6TH P.M., COUNTY OF WELD, STATE OF COLORADO
PARCEL 4: ALL THAT PART OF THE W1/2 OF THE SW 1/4 LYING SOUTH OF THE SOUTH
RIGHT OF WAY OF COUNTY ROAD 378 (AKA W. 54th St Rd), IN SECTION 34, TOWNSHIP
5 NORTH, RANGE 66 WEST OF THE 6TH P.M., COUNTY OF WELD, STATE OF COLORADO
EXCEPT THAT PORTION AS CONVEYED BY DEED RECORDED FEBRUARY 1, 1983 AT
RECEPTION NO. 1916171, as shown on Improvement Survey recorded October 26, 2005
at Reception No. 3334443 and more particularly described as follows:
A tract of land located in the West One -Half Southwest One -Quarter (W1/2SW1/4) of
Section Thirty -Four (34), Township Five (5) North, Range Sixty -Six (66) West of the 6th
Principal Meridian, Weld County, Colorado being more particularly described as:
Considering the North line of the Southwest One -Quarter (SW 1/4) of said Section
Thirty -Four (34) to bear South 88°54'53" East, and all bearings contained herein being
relative thereto:
Beginning at a point whence the South One -Sixteenth (S 1/16) Corner of said Section
Thirty -Four (34) and Section Thirty -Three (33), Township Five (5) North, Range Sixty -Six
(66) West of the 6th Principal Meridian bears South 06°37'18" West 231.18 feet thence
along the easterly right-of-way line of Weld County Road 31, South 01°28'06" East,
211.06 feet West 231.18 feet thence along the easterly right-of-way line of Weld
County Road 31, South 01°28'06" East 211.06 feet; 06" East 211.06 feet; thence South
01°27'53" East 726.25 feet thence leaving said easterly right-of-way line of Weld County
53" East 726.25 feet thence leaving said easterly right-of-way line of Weld County East.
726.25 feet thence leaving said easterly right-of-way line of Weld County Road 31, North
52°25'34" East 228.87 feet 34" East 228.87 feet East 228.87 feet thence, North
83°53'53" East 379.90 feet thence, North 67°49'01" East 174.21 feet thence, North
84°46'00" East, 458.30 feet East 379.90 feet thence, North 67°49'01" East 174.21 feet
thence, North 84°46'00" East, 458.30 feet 01" East 174.21 feet thence, North 84°46'00"
East, 458.30 feet 00" East 458.30 feet; thence, (LI) South 87°53'13" East 66.99 feet
thence, (L2) South 75°20'24" East 80.92 feet; thence, (L3) South 66°35'08" East 92.30
feet 13" East 66.99 feet thence, (L2) South 75°20'24" East 80.92 feet thence, (L3) South
66°35'08" East 92.30 feet 24" East 80.92 feet thence, (L3) South 66°35'08" East 92.30
feet 08" East 92.30 feet to a point on the east line of the West One -Half Southwest
One -Quarter (W1/2SW1/4) of said Section Thirty -Four (34); thence along said east line of
the West One -Half Southwest One -Quarter (W1/2SW1/4) of said Section Thirty -Four (34),
North 02°26'26" West 943.31 feet to West 943.31 feet to the southeasterly right-ofway
of Weld County Road 378; thence, leaving said east line of the West One -Half Southwest
One -Quarter (W1/2SW1/4) of said Section Thirty -Four (34) and along said southeasterly
right-of-way of Weld County Road 378, South 78°32'37" West 54.05 feet West, 54.05
feet thence, South 80°31'42" West 1347.02 feet to the Point of Beginning.42" West
1347.02 feet to the Point of Beginning.
'REPARED BY: Ri
RESPEC
720 S. Colorado Blvd., Suite 410
DENVER, CO 80246
www.respec.com
RAPTOR MATERIALS, LLC
AGGREGATE MINE SITE PLAN
PART OF SECTIONS 3 & 4, TOWNSHIP 4 NORTH
RANGE 66 WEST, AND SECTIONS 33 & 34,
TOWNSHIP 5 NORTH, RANGE 66 WEST OF THE
6TH PRIME MERIDIAN
CITY OF EVANS, COUNTY OF WELD, STATE OF COLORADO
CURRENT ZONE: PUD
REVISIONS SHEET
INDEX
1
0
0
0
0
0 INITIAL RELEASE
1
2
3
4
5
COVER SHEET
EXISTING CONDITIONS
SITE PLAN
GRADING PLAN
RECLAIMED SITE PLAN
OCTOBER 6, 2023
SITE PLAN FOR:
RAPTOR MATERIALS, LLC
AGGREGATE MINE
14822 HWY 396
EVANS, CO 80634
PREPARED FOR:
RAPTOR MATERIALS, LLC
GARRETT VARRA
8120 GAGE ST
FREDERICK, CO 80516
(303) 666-6657
APPROVED BY:
RAPTOR MATERIALS, LLC
GARRETT VARRA
DATE
RESPEC COMPANY, LLC
PETER CHRISTENSEN
Image Sauce AL TA.P124-VARRA COMPANIES EVANS-MIWKEN (2022-03-31) pd', Lat40', Inc
G13 PARCEL ONES
SUBJECT PROPERTY
•
-,
1
•
2.)
DATE
Gr
4o O
PROJECT NO: M0020
INITIAL PLAN RELEASE: October 6, 2023
TOTAL SHEETS: 5
'))`J1
„ se Le ts
111
- .. SO
tratizzrat
ewe e -a a.
.Miras°
.aR a'
WS
-......_...
\ WSW
_nns.r 4 ale MS MISS
I mist E-7010: 70'' .4tl InR1 *".
SS
WNW Slaw !
0 RESPEC
720 S. Colorado Blvd., Suite 410 �'ORTPC
DENVER, CO 80248
www.respec.com
W N
hiriyt rsu � aM 1 ( 7/
°
SOUNDARY - APPROASWLTE
FENCE
EMT -Of -/NAY GRANT (701
DCP CANVASSACX TO
OOOfREY PIPELINE EASEMENT
CONTOUR UK (I FT)
RIDHT.Of-WAY LINE
r
7
ter\
arimplailas
lbeffilin Pism on er
r
OVERHEAD DILLY MI
STREET - EJI6TM0
�, SOUTI ►ta1'uu RIVER (AI►ROXANTFJ
WWI DISTANCE SETWEEN FOUND ►►I7
▪ WITNESS CORNEA
O FOUND ALIQUOT CORNER AS MSC REED
O CALCULATED POSITION
FOUND A R E BAR WITh t .D' R E D PLASTIC
• CAP LS 2 DIY t NSYSSSY E 7.26' rsoM
CALCULATED POSITION
0
4
C3
IRODUCWG WELL HEAD
APPROXIMATE PLUMBED AND
ABANDONED WELL HEAD LOCATION
ELECTRIC METER
ELECTRIC SERVICE
POWER POLE
Image San ALTA-P124-VARRA COMPANIES_EVANS-M IWKEN (2022-03.91).p&. ISM0'. Inc.
NOTES
THIS PLAN IS INTENDED AS THE EXISTING CONDITIONS PLAN FOR RAPTOR MATERIALS,
LLC - EVANS. CO.
ALL IMPROVEMENTS ARE EXISTING.
IT IS THE OWNER AND/OR THE CONTRACTOR'S RESPONSIBILITY TO ATTAIN ALL
APPROPRIATE PERMITS AND REVIEW APPROVALS FROM THE STATE OF COLORADO
AND TOWN OF EVANS RESPECTIVELY.
ANY REFERENCE TO EASEMENTS. SURVEY POINTS, OR EXISTING UTILITIES AND
FEATURES ARE BASED SOLELY FROM SURVEY INFORMATION PROVIDED BY Lat40°. Inc.,
PROFESSIONAL LAND SURVEYORS, 6250 W. 10TH STREET, UNIT 2, GREELEY, CO 80634,
DATED MARCH 31. 2022, WITH THE EXCEPTION OF THE DCP CANVASBACK TO GODFREY
PIPELINE PROVIDED BY LW SURVEY CO., DATED AUGUST 26, 2022.
NOT ALL UNCC UTILITY LOCATES HAVE BEEN PERFORMED. IT IS HTE CONTRACTOR'S
RESPONSIBIUTY TO VERIFY ALL UTILITIES ARE LOCATED AND SURVEY PROVIDED TO
THE OWNER AND ENGINEER PRIOR TO CONSTRUCTION DRAWING RELEASE.
SETBACKS WHERE REQUIRED WILL BE BASED ON THE ACTUAL FIELD LOCATIONS OF
SITE FEATURES.
EXTRACTION WILL NOT OCCUR CLOSER THAN 125± FEET FROM THE FACE OF A
RESIDENTIAL STRUCTURE UNLESS THERE IS A WRITTEN ACCOMMODATION WITH THE
OWNER OF THE RESIDENTIAL STRUCTURE THAT ALLOWS EXTRACTION TO OCCUR
WITHIN A CLOSER STATED LIMIT.
EXTRACTION WILL OCCUR NO CLOSER THAN 25t FEET FROM WELL HEADS AND
RELATED ABOVE GROUND FACILITIES. EXTRACTION AROUND WELL HEADS WILL BE
CONCURRENTLY BACKFILLED TO MAINTAIN A 100± FOOT BUFFER FROM THE BALANCE
OF EXTRACTED LANDS.
EXTRACTION WILL OCCUR NO CLOSER THAN 10t FEET FROM THE EDGE OF PROPERTY
LINES: EASEMENTS AND RIGHTS -OF -WAY, UNDERGROUND GAS UNES OR OTHER
UNDERGROUND FACILITIES. IRRIGATION DITCHES AND SEEP DITCH. WATER WELLS
AND OTHER STRUCTURES.
IT IS ANTICIPATED THAT SOME OR ALL OF THE OIL AND GAS INFRASTRUCTURE USE
WILL BE COMPLETED AND THE INFRASTRUCTURE REMOVED TO FACILITATE THE
EXTRACTION SHOWN. IF OR WHILE OIL AND GAS INFRASTRUCTURE IS STILL IN PLACE,
EXTRACTION WILL NOT OCCUR WITHIN 10 FEET OF OIL AND GAS LINES, OR 25 FEET
FROM THE WELLS, AS INDICATED IN THE SETBACKS DETAILED ABOVE.
to aS
Y. •Mt
•W rfn'
s WATER MARKER
N WATER VETO
�. WATER VALVE
OAS WAWA
OAT!
Y POST
RAPTOR MATERIALS, LLC
CITY OF EVANS, COUNTY OF WELD, STATE OF COLORADO / M0020
EXISTING CONDITIONS
October 10, 2023 SHEET 2 OF 5
d°.se jot a.s.
as.
rurw • rem wr a
r usP•
L10
s w11-wr esa.
WON Oa •twr
DOtaTTR 10A
(a• r SST Ms
N W44'4Y C 2670.01
44444/1•• ts>aa
NORTHWEST
FIELD
a
.
s. er Ps Y
Casa SI
war
r sea
a •ra lost aaaeaNI4
tear
.r-.-._.-----
r.1D'SB' t tS7 W
at•taa•••4aIIN114•
aaarrralNtr
SW WASH POND t•
- 5.8 ewes
a
SV4 w • 15*tan
or war
mo• sr
w_
tar P• _ mans a.e'p
u• Fa•••
COIN AIOMO ant.• amen *No
Ana ♦ 1 •t 'a•
cram to 'ato
suns L '.. Rao
t.r a•t •w trim as'
a(•aa W O IS
I t
at re, ASV
LIR
02
a•rr. ya . 4: asMa
a4.. ta..w Y4.1
J n%o• a at.
W Syw
1 u.a
reran
I.CS a�..we••
ntrr. S Pt. M. I ttSJ
a —
e es'
Isms r
r an
ray n S
Mamie wu
ass Brae
SW MATERIAL PROCESSING AREA
-18.4± ACRES
oaro el, _
wN. re.r t•w ••• �n a
w.•t•w1•••••••••W i, lnbn Y FL W a41' I* 1 tL n IS. • PTE IT • In rt FictW7 ri t-00 w Or r tom- PIENR SAT **AIL
• 84.2It,L ar t'. . n rata Uo **AIL .
1.laartr4 Am
- Kovrttw.Ar !►1.171
(-►Thor V. 11Milt
e W a all Milo
• Sat a at N •
WV Y MAO ••
� an li
I a ar • .r .•r
.....n4 a
anelFr
ae
A atRr Is
SW
In Lime
NW Re
ts-am
OTERM2 Rn lrrrAed3J•
4)111 Aar
tta.0.00 qwJ
rar w Iw.
• art•'.r 1 1 ra0•
aan.'t. ••tr
• rata aM'
aA
• ► SAN w r 1
r•• rare• Ann
Ole r.r.i,t
t•r WA AA
M q.Vat•w a 4_
• ',1=414 4•S
CENTRAL
FIELD
-4srl
kl
V 6
�Ib
Matt= r\ A-
ir ttaar rata rr1- ernes ihn oft
15,5 1 Muir'
•ISr
atM"er
S 66"21'26' I 1450.55
\is
L lava C.4MIS 0 CO rest;
Ursa
car
astral' W u w
S 66'30'60" C
Na,nrtt1
mrBoar
T 1
IMisN. OW'tl at*
1 1 as tar
wiz S no LI
•-. OWE, • .t
ql• .,Arlo a•• II LIMA
a We • SPCMS• IV Mr
soma wee
!400
N 66'56'io' 1 1425,te'
MS te art.a •
ar a isae
Mai *IC acne
I17..tat flag.
'r•P .•• w •r
Writ 1•0 to.M'
,. two sr atsa cape
I wino' r nER_lr
it
3•a• •an antra as
ataaa.yy a it ft
J 'i tfa7•'aw l . R.ara
---tamerfa
J
VAtor
/ �r
rat rat as
tow
/
\. Rtt''i'
•fa'I Rat lw'
Imago San ALTA-P124-VARRA COMPANIES EVANS-A•LL/KEN (2022-0331) pol. Lat40', Inc
GIS PARCEL LINES
SUBJECT PROPERTY
NOTES
THIS PLAN IS INTENDED AS THE EXISTING CONDITIONS PLAN FOR RAPTOR MATERIALS,
LLC - EVANS, CO.
ALL IMPROVEMENTS ARE EXISTING.
IT IS THE OWNER AND/OR THE CONTRACTOR'S RESPONSIBIUTY TO ATTAIN ALL
APPROPRIATE PERMITS AND REVIEW APPROVALS FROM THE STATE OF COLORADO
AND TOWN OF EVANS, RESPECTIVELY.
ANY REFERENCE TO EASEMENTS, SURVEY POINTS, OR EXISTING UTIUTIES AND
FEATURES ARE BASED SOLELY FROM SURVEY INFORMATION PROVIDED BY Lat40', Inc.,
PROFESSIONAL LAND SURVEYORS, 6250 W. 10TH STREET, UNIT 2, GREELEY, CO 80634,
DATED MARCH 31, 2022, WITH THE EXCEPTION OF THE DCP CANVASBACK TO GODFREY
PIPELINE PROVIDED BY LW SURVEY CO., DATED AUGUST 26, 2022.
NOT ALL UNCC UTILITY LOCATES HAVE BEEN PERFORMED. IT IS HTE CONTRACTOR'S
RESPONSIBILITY TO VERIFY ALL UTILITIES ARE LOCATED AND SURVEY PROVIDED TO
THE OWNER AND ENGINEER PRIOR TO CONSTRUCTION DRAWING RELEASE.
SETBACKS WHERE REQUIRED WILL BE BASED ON THE ACTUAL FIELD LOCATIONS OF
SITE FEATURES.
EXTRACTION WILL NOT OCCUR CLOSER THAN 125± FEET FROM THE FACE OF A
RESIDENTIAL STRUCTURE UNLESS THERE IS A WRITTEN ACCOMMODATION WITH THE
OWNER OF THE RESIDENTIAL STRUCTURE THAT ALLOWS EXTRACTION TO OCCUR
WITHIN A CLOSER STATED LIMIT.
EXTRACTION WILL OCCUR NO CLOSER THAN 25± FEET FROM WELL HEADS AND
RELATED ABOVE GROUND FACILITIES. EXTRACTION AROUND WELL HEADS WILL BE
CONCURRENTLY BACKFILLED TO MAINTAIN A 100± FOOT BUFFER FROM THE BALANCE
OF EXTRACTED LANDS.
EXTRACTION WILL OCCUR NO CLOSER THAN 10± FEET FROM THE EDGE OF PROPERTY
LINES; EASEMENTS AND RIGHTS -OF -WAY, UNDERGROUND GAS ONES OR OTHER
UNDERGROUND FACILITIES, IRRIGATION DITCHES AND SEEP DITCH. WATER WELLS
AND OTHER STRUCTURES.
IT IS ANTICIPATED THAT SOME OR ALL OF THE OIL AND GAS INFRASTRUCTURE USE
WILL BE COMPLETED AND THE INFRASTRUCTURE REMOVED TO FACILITATE THE
EXTRACTION SHOWN. IF OR WHILE OIL AND GAS INFRASTRUCTURE IS STILL IN PLACE,
EXTRACTION WILL NOT OCCUR WITHIN 10 FEET OF OIL AND GAS LINES. OR 25 FEET
FROM THE WELLS, AS INDICATED IN THE SETBACKS DETAILED ABOVE.
Ill RESPEC
720 S. Colorado Blvd., Suite 410
DENVER, CO 80248
www.respec.com
MOO. DATE
REPORT NO:
08 S. VON FLUE
CS P. CHRISTENSEN
0E•ra
sa)NOAAY . AP►*o3SATE
EXTRACTION urns
MEE
R1t)RdFYWLY ORANT (RI)
DCP CANVASBACK TO
OOOFR tY PIPE LN E EASEMENT
- IMOIT.01401Y1110
OVERHEAD UTILITY LINE
- STREET. EALSTNG
SCUM PLATTE R {WAOAW/ATE)
MO OW NICE BETWEEN FOUND MI
▪ WITNESS CORNER
In FOUND ALIQUOT CORNER AS DESCRIBED
o CALCULATED ROORON
FOUND M REMR WITH 1.n. RED ELASTIC
• CAP LS 1MMl NN'NSV E 136- PROM
Catty LATEO POSITION
0
PRODUC NG WELL. HEAD
AP rtO1(RMTE ►WOOED AND
ABANDONED WELL HEAD LOCATION
ELECTRIC METER
ELECTRIC SERVICE
POWER POLE
3c
a
N
a'
Y
EMTU HARM
STIR METER
STIR VALVE
DAB awn
GATE
TORT
RAPTOR MATERIALS, LLC
CITY OF EVANS, COUNTY OF WELD, STATE OF COLORADO / M0020
SITE PLAN
October 10, 2023
SHEET 3 OF 5
Aa♦aS
„U.c�° �b if
�r rv,4Y or u .N
L-
.%
X71,
AI r 'an W aT
ILO ST tots' t,`1-SI
Q
IL •1 KO
no.
�A;.a:..,, .fl
an ISMSS so. 21.111
'at as
nrewe'
ISSIOS NZ
InSa.c•
C0MM !PAD a
0 RESPEC
720 S. Colorado Blvd., Suite 410
DENVER, CO 80246
www.respec.com
Image San AL7A-P124-VARRA COMPANIES_EVANS-MILLIKEN (2072-0341) pots'. Lat40'. Inc
NOTES
THIS PLAN IS INTENDED AS THE EXISTING CONDITIONS PLAN FOR RAPTOR MATERIALS,
LLC - EVANS, CO.
ALL IMPROVEMENTS ARE EXISTING.
IT IS THE OWNER AND/OR THE CONTRACTOR'S RESPONSIBIUTY TO ATTAIN ALL
APPROPRIATE PERMITS AND REVIEW APPROVALS FROM THE STATE OF COLORADO
AND TOWN OF EVANS. RESPECTIVELY.
ANY REFERENCE TO EASEMENTS, SURVEY POINTS, OR EXISTING UTIUTIES AND
FEATURES ARE BASED SOLELY FROM SURVEY INFORMATION PROVIDED BY Lat40°, Inc.,
PROFESSIONAL LAND SURVEYORS, 6250 W. 10TH STREET. UNIT 2, GREELEY CO 80634,
DATED MARCH 31, 2022, WITH THE EXCEPTION OF THE DCP CANVASBACK TO GODFREY
PIPELINE PROVIDED BY LW SURVEY CO., DATED AUGUST 26, 2022.
NOT ALL UNCC UTILITY LOCATES HAVE BEEN PERFORMED. IT IS HTE CONTRACTOR'S
RESPONSIBILITY TO VERIFY ALL UTILITIES ARE LOCATED AND SURVEY PROVIDED TO
THE OWNER AND ENGINEER PRIOR TO CONSTRUCTION DRAWING RELEASE.
SETBACKS WHERE REQUIRED WILL BE BASED ON THE ACTUAL FIELD LOCATIONS OF
SITE FEATURES.
EXTRACTION WILL NOT OCCUR CLOSER THAN 125± FEET FROM THE FACE OF A
RESIDENTIAL STRUCTURE UNLESS THERE IS A WRITTEN ACCOMMODATION WITH THE
OWNER OF THE RESIDENTIAL STRUCTURE THAT ALLOWS EXTRACTION TO OCCUR
WITHIN A CLOSER STATED LIMIT.
EXTRACTION WILL OCCUR NO CLOSER THAN 25± FEET FROM WELL HEADS AND
RELATED ABOVE GROUND FACIUTIES. EXTRACTION AROUND WELL HEADS WILL BE
CONCURRENTLY BACKFILLED TO MAINTAIN A 100± FOOT BUFFER FROM THE BALANCE
OF EXTRACTED LANDS.
EXTRACTION WILL OCCUR NO CLOSER THAN 10± FEET FROM THE EDGE OF PROPERTY
LINES: EASEMENTS AND RIGHTS -OF -WAY; UNDERGROUND GAS UNES OR OTHER
UNDERGROUND FACILITIES, IRRIGATION DITCHES AND SEEP DITCH. WATER WELLS
AND OTHER STRUCTURES.
IT IS ANTICIPATED THAT SOME OR ALL OF THE OIL AND GAS INFRASTRUCTURE USE
WILL BE COMPLETED AND THE INFRASTRUCTURE REMOVED TO FACILITATE THE
EXTRACTION SHOWN. IF OR WHILE OIL AND GAS INFRASTRUCTURE IS STILL IN PLACE,
EXTRACTION WILL NOT OCCUR WITHIN 10 FEET OF OIL AND GAS LINES, OR 25 FEET
FROM THE WELLS, AS INDICATED IN THE SETBACKS DETAILED ABOVE.
Siin
riaeol
ROY M bow
ar vs Ara as
r
wr. a.•ar
s• gear rear r •. l
real n
sal tocsol .
3.10
ales-e-ar •.1Ra
tea to en
as Ma* a.a*SEW
sire
411 Ore arli
1 w''Jdf' I IISE.1w
oMR4twe Jr
I
we e. •••
aperspo Min
w MIS
may a
r•.
••••••• -- swan.
MVO
*MO .oat as-
a.I}WIMP. OMPO
Oa ., -..a •
•a• • er •s LW
'mama. w ti is•
St re.
••••••— ..•"
See —n
}
33414 IW 1 aaai•\•O
rwR
.• l
%\%.%
/f
141'
0 RESPEC
720 S. Colorado Blvd., Suite 410
DENVER, CO 80248
www.respec.com
MOO. DATE
RL PORT NO.
08 S. VON FLUE
CH P. CNRISTENSEN
CarNTmW T't
I•.••rier M.
N 86'4443' E 2670.8?
a•r•• rar
• •ten sal
arer
'x
;CAL l• 1.-63
R w 0 ma.. 46•••
iF a• r •r
/ :Y • a.a
R nee •aa.a.[••a
MA ere stair
r nee ♦ -
Ma w mar ns aar
cow ar n • ..I/.AV
C
w
maps um 1r Nan ea at 1..11
Maelli al le •an•tat aR.a•M Me •
- Nin * •aa. as. pier • as re
•rt mows.. aa•.•Y^ M .LT alned
• .f• Mena - •a ea el V •.a •
4am we • et OM
{ ..N. al M•aI-
I • wan F ,.,r ger
gasman., nee
•-010.'1
-OflJCA 1. STIR TP.tRrns
4JS * Row
(saeawR .ORE,
IArpt•/ Are
Yn.$a Au J•1[17
Ota.J4Ia V• 1130that
amore
-•R W
Y• w' Na
fM•maw
at en. Se
."ormair p•
a
. air. I L16
M A.ss— i
I w.11 .C1
Mlil. /
••mama
dal•
z
8
•R".,•t�'fa. tiey
.e_a..anrs n'
L17git 'Iran
el or/
/ tsTuu:44 -
Mere
.w•• an • es eh
. atrn SUS e
el s- . a. •a
a J Pr TM
S. a. a' awe al
nee • se oar IS
a— - •.�..
!ARMI
a:aaaM r
arlmaaON.ri
40.1
'yutal else aa•.
■■\•el saw
mi.'4 W'. W `T
eau.t r. lea
S 86'21'76- E ,458.54'
R1 ..y.. Sella alaiel
.ram ••.. x ea
•.r a IS •. ar
*Hamm (a :/ Me
...ream's lane u e
tY .. •r... aw a. Meta
• net • ranee..
N 003690' w 142318'
ass no won asa
as • .a aww a
- an w it SWIM
Se
aaaaw„ was.
\ le. ••w
=I a•aaSag'r.. .0 n. —'• 1<i
•anal a,MP. en
1t .t•
s sneer near
Mr •es taae
••fie an sane a•r••
tu'•em a It. Lae -
saran
f- Lr
S 0•'20'00' E 137.20'
N »sD's •moss
b1.ar r. Yek• St
�0
a TAT Rapp
�•Iaa1p� Me
'team' ca. •
tER. 1 le. a'
wRe � n+. •n.' r
ate• :If LI 14...4
SOUNDAR► - APPROXIMATE
FENCE
RI0NT.OffAT ORANT 00)
DCP CANVASSACI TO
GODFREY PIPE tNE EASEMENT
RIGHT -Of AY LINE
OVERNEADWar U1M
STREET- ERMEMO
SOUTH PLATTE RNER LAP►ROAMATEJ
DLSTNICE BETWEEN FOUND ►ERS
WRNESS CORNER
FOtMD ALIQUOT CORNEA AS OESC Ra ED
CAL MLA TED POSITION
FOUND IS MESAR WITH I.1S• RED PLA511C
CAP LB min wartoor E a T' FROM
CALCULATED POSITION
O
0
ts3
L.
VROOUCW01NELL HEAD
A►PRORaMTE ►WOOED AND
ARAN DONEE WELL MEAD LOCATION
ELECTRIC METER
E LECTRC SERNCE
POWER POLE
re
Y
WATER WARIER
WATER METER
WATER VALVE
OAS WARIER
GATE
POST
1' e-sc'e._ '1' 1,'U I Mn (!I
013 PARCEL LINES
SUBJECT PROPERTY
(nape Sans AL TA•P124-VARRA COMPANIES_E VANS-MILLIKEN (2022-0331) pd/, Lwt40', Inc
NOTES
THIS PLAN IS INTENDED AS THE EXISTING CONDITIONS PLAN FOR RAPTOR MATERIALS,
LLC - EVANS, CO.
ALL IMPROVEMENTS ARE EXISTING.
IT IS THE OWNER AND/OR THE CONTRACTOR'S RESPONSIBILITY TO ATTAIN ALL
APPROPRIATE PERMITS AND REVIEW APPROVALS FROM THE STATE OF COLORADO
AND TOWN OF EVANS, RESPECTIVELY.
ANY REFERENCE TO EASEMENTS, SURVEY POINTS, OR EXISTING UTIUTIES AND
FEATURES ARE BASED SOLELY FROM SURVEY INFORMATION PROVIDED BY Lat40', Inc.,
PROFESSIONAL LAND SURVEYORS, 6250 W. 10TH STREET, UNIT 2, GREELEY, CO 80634,
DATED MARCH 31, 2022, WITH THE EXCEPTION OF THE DCP CANVASBACK TO GODFREY
PIPELINE PROVIDED BY LW SURVEY CO., DATED AUGUST 26, 2022.
NOT ALL UNCC UTILITY LOCATES HAVE BEEN PERFORMED, IT IS HTE CONTRACTOR'S
RESPONSIBILITY TO VERIFY ALL UTILITIES ARE LOCATED AND SURVEY PROVIDED TO
THE OWNER AND ENGINEER PRIOR TO CONSTRUCTION DRAWING RELEASE.
SETBACKS WHERE REQUIRED WILL BE BASED ON THE ACTUAL FIELD LOCATIONS OF
SITE FEATURES.
EXTRACTION WILL NOT OCCUR CLOSER THAN 1251 FEET FROM THE FACE OF A
RESIDENTIAL STRUCTURE UNLESS THERE IS A WRITTEN ACCOMMODATION WITH THE
OWNER OF THE RESIDENTIAL STRUCTURE THAT ALLOWS EXTRACTION TO OCCUR
WITHIN A CLOSER STATED LIMIT.
EXTRACTION WILL OCCUR NO CLOSER THAN 25t FEET FROM WELL HEADS AND
RELATED ABOVE GROUND FACILITIES. EXTRACTION AROUND WELL HEADS WILL BE
CONCURRENTLY BACKFILLED TO MAINTAIN A 1001 FOOT BUFFER FROM THE BALANCE
OF EXTRACTED LANDS.
EXTRACTION WILL OCCUR NO CLOSER THAN 10t FEET FROM THE EDGE OF PROPERTY
LINES; EASEMENTS AND RIGHTS -OF -WAY; UNDERGROUND GAS UNES OR OTHER
UNDERGROUND FACILITIES, IRRIGATION DITCHES AND SEEP DITCH, WATER WELLS
AND OTHER STRUCTURES.
IT IS ANTICIPATED THAT SOME OR ALL OF THE OIL AND GAS INFRASTRUCTURE USE
WILL BE COMPLETED AND THE INFRASTRUCTURE REMOVED TO FACILITATE THE
EXTRACTION SHOWN. IF OR WHILE OIL AND GAS INFRASTRUCTURE IS STILL IN PLACE,
EXTRACTION WILL NOT OCCUR WITHIN 10 FEET OF OIL AND GAS LINES, OR 25 FEET
FROM THE WELLS, AS INDICATED IN THE SETBACKS DETAILED ABOVE.
RAPTOR MATERIALS. LLC
CITY OF EVANS, COUNTY OF WELD. STATE OF COLORADO / M0020
RECLAIMED SITE PLAN
October 10, 2023
SHEET 5 OF 5
ATTACHMENT D
HEC-RAS Plan: NoRisePreProiect River: BioThomoson Reach: BT: Lower Profile: 1%
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crit W.S.
E.G. Elev
E.G. Slope
Vel Chni
Flow Area
Top Width
Froude O Chl
WO
(ft)
(ft)
(ft)
(ft)
(010)
(ft/e)
($4 ft)
(ft)
BT: Lower
15282
1%
22247.00
4688.09
4698.80
4697.46
4699.05
0.001339
7.04
8442.16
2482.56
0.41
BT: Lower
14843
1%
22247.00
4687.94
4698.23
4696.74
4698.45
0.001337
6.57
8024.61
2168.79
0.40
BT: Lower
14014
1%
22247.00
4687.27
4697.43
4697.66
0.001367
6.52
7173.97
1836.22
0.40
BT: Lower.
13995
Lat Struct
BT: Lower
12916
1%
22247.00
4686.56
4696.09
4696.39
0.001968
7.59
7090.78
2278.01
0.49
BT: Lower
12612
1%
22247.00
4686.83
4695.57
4695.77
0.001693
6.55
7975.10
2675.49
0.44
BT: Lower
12309
1%
22247.00
4686.88
4694.95
4693.97
4695.21
0.001909
7.08
7558.68
2826.30
0.50
BT: Lower
12230
1%
22247.00
4682.54
4694.63
4693.85
4695.06
0.001570
7.46
7204.49
2559.11
0.44
BT: Lower
12186
1%
22247.00
4678.15
4694.47
4693.87
4694.94
0.001855
7.90
6876.17
2583.08
0.50
BT: Lower
11919
1%
22247.00
4682.80
4693.81
4693.42
4694.30
0.003926
8.82
6303.63
2752.42
0.64
BT: Lower
10886
1%
22247.00
4680.31
4692.70
4692.96
0.000936
5.93
9460.36
3159.59
0.35
BT: Lower
10885
Lat Struct
BT: Lower
10304
1%
22247.00
4680.24
4692.33
4690.14
4692.41
0.000918
3.08
11154.86
3524.49
0.19
BT: Lower
10000
1%
22247.00
4680.43
4692.11
4689.43
4692.19
0.000620
3.74
11649.47
3894.37
0.24
BT: Lower
9458
1%
22247.00
4679.62
4691.66
4690.41
4691.87
0.000978
6.25
10959.33
3662.44
0.37
BT: Lower
9149
1%
22247.00
4680.03
4691.20
4690.21
4691.45
0.001792
7.43
8852.01
3056.99
0.46
BT: Lower
8628
1%
22247.00
4679.12
4690.44
4690.64
0.001367
5.59
9107.17
3201.92
0.39
BT: Lower
8597
1%
22247.00
4679.67
4690.41
4690.59
0.001316
5.62
9482.01
3186.37
0.38
BT: Lower
8552
1%
22247.00
4678.55
4690.34
4690.52
0.001411
6.71
9513.38
3131.25
0.41
BT: Lower
7956
Lat Struct
BT: Lower
7651
1%
22247.00
4677.23
4688.99
4689.20
0.001493
7.60
9230.09
3156.60
0.43
BT: Lower
7050
1%
22247.00
4676.09
4688.03
4688.31
0.001449
7.38
9083.97
3013.78
0.46
BT: Lower
6703
1%
22247.00
4676.35
4687.64
4687.81
0.001252
6.14
10461.45
3362.51
0.39
BT: Lower
5853
1%
22247.00
4674.81
4686.20
4685.31
4686.45
0.002074
6.94
8807.67
3635.12
0.51
BT: Lower
5817
Bridge
BT: Lower
5792
1%
22247.00
4674.77
4685.91
4685.19
4686.18
0.001898
7.27
8969.65
3932.33
0.49
BT: Lower
5542
1%
22247.00
4674.98
4685.60
4685.69
0.001311
4.59
10988.13
3569.51
0.29
BT: Lower
5226
1%
22247.00
4674.41
4685.13
4685.27
0.001311
5.94
10290.04
3246.31
0.39
BT: Lower
4874
1 %
22247.00
4674.12
4684.59
4684.77
0.001510
6.31
9313.14
2822.35
0.41
BT: Lower
4569
1%
22247.00
4673.95
4684.09
4684.27
0.001769
4.98
8514.07
2778.09
0.42
BT: Lower
3839
1%
22247.00
4672.72
4682.15
4679.79
4682.74
0.003153
7.89
5399.01
2541.46
0.58
BT: Lower
3242
1%
22247.00
4672.05
4681.59
4678.04
4681.78
0.001534
5.31
8165.41
2183.09
0.41
BT: Lower
3041
1%
22247.00
4672.69
4681.58
4681.62
0.000223
2.36
15727.84
3638.59
0.17
BT: Lower
2320
1%
22247.00
4671.25
4681.37
4681.46
0.000452
3.81
10579.83
3024.44
0.23
BT: Lower
1708
1%
22247.00
4670.34
4681.11
4681.19
0.000521
3.89
10730.10
3845.09
0.24
BT: Lower
993
1%
22247.00
4669.62
4680.96
4681.01
0.000180
2.33
13118.86
4143.10
0.14
BT: Lower
464
1%
22247.00
4669.44
4680.82
4680.89
0.000322
3.51
14198.40
4388.68
0.21
BT: Lower
0
1%
22247.00
4669.12
4680.60
4675.15
4680.74
0.000303
3.82
12661.83
4483.69
0.20
HEC-RAS Plan: NoRisePostProject River: BigThompson Reach: BT: Lower Profile: 1%
Reach
River Sta
Profile
Q Total
Min Ch El
W.S. Elev
Crlt W.S.
E.G. Elev
E.G. Slope
Vel Chnl
Flow Area
Top Width
Froude # Chl
WO
(ft)
(ft)
(ft)
(ft)
(0/0)
(ft/s)
(eq ft)
(ft)
BT: Lower
15282
1%
22247.00
4688.09
4698.80
4697.46
4699.05
0.001339
7.04
8442.16
2482.56
0.41
BT: Lower
14843
1%
22247.00
4687.94
4698.23
4696.74
4698.45
0.001337
6.57
8024.61
2168.79
0.40
BT: Lower
14014
1%
22247.00
4687.27
4697.43
4697.66
0.001367
6.52
7173.97
1836.22
0.40
BT: Lower
13995
Lat Struct
BT: Lower
12918
1%
22247.00
4686.56
4696.09
4696.39
0.001968
7.59
7090.78
2278.01
0.49
BT: Lower
12612
1%
22247.00
4686.83
4695.57
4695.77
0.001693
6.55
7975.10
2675.49
0.44
BT: Lower
12309
1%
22247.00
4686.88
4694.95
4693.97
4695.21
0.001909
7.08
7558.68
2826.30
0.50
BT: Lower
12230
1%
22247.00
4682.54
4694.63
4693.85
4695.06
0.001570
7.46
7204.49
2559.11
0.44
BT: Lower
12168
1%
22247.00
4678.15
4694.47
4693.87
4694.94
0.001854
7.89
6877.43
2583.14
0.50
BT: Lower
11919
1%
22247.00
4682.80
4693.81
4693.42
4694.30
0.003908
8.80
6314.38
2753.39
0.64
BT: Lower
10886
1%
22247.00
4680.31
4692.49
4692.79
0.001134
6.43
8771.51
3137.77
0.38
BT: Lower
10885
Lat Struct
BT: Lower
10304
1%
22247.00
4680.24
4692.04
4690.08
4692.13
0.001093
3.28
10051.20
3470.73
0.21
BT: Lower
10000
1%
22247.00
4680.43
4691.81
4689.43
4691.89
0.000659
3.62
11325.31
3867.84
0.24
BT: Lower
9458
1%
22247.00
4679.62
4691.44
4689.89
4691.59
0.000819
5.62
12128.11
3659.40
0.34
BT: Lower
9149
1%
22247.00
4680.03
4691.04
4689.75
4691.24
0.001549
6.83
9831.32
3036.96
0.43
BT: Lower
8828
1%
22247.00
4679.12
4690.41
4690.56
0.001093
5.12
10482.76
3200.44
0.35
BT: Lower
8597
1%
22247.00
4679.67
4690.38
4690.52
0.001179
5.07
10390.69
3186.57
0.35
BT: Lower
8552
1%
22247.00
4678.55
4690.34
4690.46
0.001277
5.44
10265.16
3131.24
0.33
BT: Lower
7956
Lat Struct
BT: Lower
7651
1%
22247.00
4677.23
4688.99
4689.20
0.001486
7.58
9228.55
3156.60
0.43
BT: Lower
7050
1%
22247.00
4676.09
4688.03
4688.31
0.001449
7.38
9083.97
3013.78
0.46
BT: Lower
8703
1%
22247.00
4676.35
4687.64
4687.81
0.001252
6.14
10461.45
3362.51
0.39
BT: Lower
6853
1%
22247.00
4674.81
4686.20
4685.31
4686.45
0.002074
6.94
8807.67
3635.12
0.51
BT: Lower
5817
Bridge
BT: Lower
5792
1%
22247.00
4674.77
4685.91
4685.19
4686.18
0.001899
7.27
8967.76
3932.23
0.49
BT: Lower
5542
1%
22247.00
4674.98
4685.60
4685.69
0.001311
4.59
10986.40
3569.49
0.29
BT: Lower
5226
1%
22247.00
4674.41
4685.13
4685.27
0.001311
5.94
10291.06
3246.80
0.39
BT: Lower
4874
1%
22247.00
4674.12
4684.59
4684.77
0.001510
6.31
9313.14
2822.35
0.41
BT: Lower
4569
1%
22247.00
4673.95
4684.09
4684.27
0.001769
4.98
8513.99
2777.24
0.42
BT: Lower
3839
1%
22247.00
4672.72
4682.15
4679.79
4682.74
0.003153
7.89
5399.01
2541.46
0.58
BT: Lower
3242
1%
22247.00
4672.05
4681.59
4678.04
4681.78
0.001534
5.31
8165.41
2183.09
0.41
BT: Lower
3041
1%
22247.00
4672.69
4681.58
4681.62
0.000223
2.36
15727.84
3638.59
0.17
BT: Lower
2320
1%
22247.00
4671.25
4681.37
4681.46
0.000452
3.81
10579.83
3024.44
0.23
BT: Lower
1708
1%
22247.00
4670.34
4681.11
4681.19
0.000521
3.89
10730.10
3845.09
0.24
BT: Lower
993
1%
22247.00
4669.62
4680.96
4681.01
0.000180
2.33
13118.86
4143.10
0.14
BT: Lower
484
1%
22247.00
4669.44
4680.82
4680.89
0.000322
3.51
14198.40
4388.68
0.21
BT: Lower
0
1%
22247.00
4669.12
4680.60
4675.15
4680.74
0.000303
3.82
12661.83
4483.69
0.20
Legend
WS 1% - NoRisePreProject
A
WS 1% - NoRisePostProject
Lat Struct
■
Ground
Legend
WS 1%
Ground
a
Ineff
Bank Sta
Legend
WS 1%
■
Ground
Ineff
•
Bank Sta
BTR_1A_Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 8628
BTR_1A_Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 8597
Legend
WS 1%
•
Ground
A
Ineff
Bank Sta
Legend
WS 1°/0
Ground
Air
Ineff
•
Bank Sta
BTR_1A_Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 8552
Legend
WS1%
■
Ground
A-
Ineff
Bank Sta
Legend
WS 1%
s
Ground
Ineff
•
Bank Sta
BTR_1A Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 7050
BTR_1A_Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 6703
Legend
WS 1%
Ground
Ineff
Bank Sta
Legend
WS 1%
Ground
Ineff
•
Bank Sta
BTR_1 A_Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 5853
0 ..0 .065 .06 .07
0
2 2 838
2 2 1
Legend
WS 1%
•
Ground
4
Ineff
Bank Sta
Legend
WS 1%
■
Ground
•
Ineff
•
Bank Sta
BTR_1 A_Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 5792
Legend
WS 1%
Ground
4
Ineff
•
Bank Sta
BTR_1A Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 5226
Legend
WS1%
Ground
A
Ineff
c
Bank Sta
Legend
WS1%
■
Ground
A
Ineff
� 4
Bank Sta
Legend
WS 1%
■
Ground
4
Ineff
•
Bank Sta
Legend
WS 1%
■
Ground
Ineff
•
Bank Sta
BTR_1A_Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 3242
Legend
WS 1%
■
Ground
A
Ineff
*
Bank Sta
BTR_1A_Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 2320
Legend
WS1%
Ground
4
Bank Sta
BTR_1A_Lower Plan: NO RISE_Pre Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 993
.031 -0 .035
BTR_1A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 15282
.050fl0 .07 .05
0 0
7 3
5 3
Legend
WS 1%
Ground
—a
Ineff
•
Bank Sta
Legend
WS 1%
Ground
Bank Sta
Legend
WS 1%
•
Ground
•
Bank Sta
BTR_1A Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 12612
Legend
WS 1%
■
Ground
•
Bank Sta
Legend
WS1%
■
Ground
A
Ineff
•
Bank Sta
Legend
WS1%
■
Ground
A-
i neff
•
Bank Sta
Legend
WS 1%
■
Ground
I neff
•
Bank Sta
BTR_1A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 11919
Legend
WS 1%
■
Ground
A
Ineff
Bank Sta
Legend
WS 1%
■
Ground
A-
Ineff
•
Bank Sta
Plan: NO RISE_Post Project 10/23/2023
RS = 10000 A Manning's of 0.1 is applied to the base of the Materials Probe
Legend
WS 1%
Ground
Ineff
Bank Sta
Legend
WS 1%
a
Ground
A -
Ineff
is
Bank Sta
BTR_1A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 9149 A Manning's of 0.1 is applied to the base of the Materials Proce
Legend
WS1%
Ground
A
Ineff
Bank Sta
Legend
WS1%
■
Ground
A
Ineff
Bank Sta
BTR_1A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 8628 A Manning's of 0.1 is applied to the base of the Materials Proce
4700-
c
0
4695-
3000
4000
0
g 4700
0
c�
co 4695
w
1000
2000
.1
3
.06—>
0: V
67
8
Station (ft)
BTR_1A_Lower Plan: NO RISE_Post Project 10/23/2023
Legend
WS1%
Ground
A
Ineff
Bank
Sta
5000
River = BigThompson Reach = BT: Lower RS = 8597 A Manning's of 0.1 is applied to the base of the Materials Proce
0
1000
2000
r
33
B
2
.1
3
.06
0
67
8
Station (ft)
r
r
T
Legend
WS 1%
■
Ground
.1
Ineff
•
Bank
Sta
3000 4000 5000
Plan: NO RISE_Post Project 10/23/2023
RS = 8552 A Manning's of 0.1 is applied to the base of the Materials Proce
BTR_1A Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 7651
Legend
WS1%
■
Ground
A
Ineff
Bank Sta
Legend
WS1%
■
Ground
4.
Ineff
t.
Bank Sta
BTR_1A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 7050
BTR_1A Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 6703
Legend
WS1%
■
Ground
41
Ineff
Bank Sta
Legend
WS1%
■
Ground
—A--
Ineff
•
Bank Sta
BTR_1A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 5853
Legend
WS 1%
■
Ground
1
Ineff
Bank Sta
Legend
WS1%
■
Ground
--A—
Ineff
•
Bank Sta
BTR_1 A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 5792
Legend
WS 1%
■
Ground
A
Ineff
Bank Sta
Legend
WS1%
■
Ground
-A-
Ineff
a
Bank Sta
BTR_1 A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 4874
.08> . . 4(.06 * .03 >4 .06
Legend
WS 1%
■
Ground
Ineff
Bank Sta
Legend
WS1%
■
Ground
A
Ineff
Bank Sta
Legend
WS 1%
■
Ground
4.
Ineff
Bank Sta
Legend
WS1%
■
Ground
A
Ineff
Bank Sta
BTR_1A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 3242
BTR_1A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 3041
Legend
WS 1%
Ground
A
Ineff
Bank Sta
Legend
WS1%
■
Ground
1
Bank Sta
BTR_1A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 2320
BTR_1 A_Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 1708
Legend
WS 1%
■
Ground
Bank Sta
BTR_1A Lower Plan: NO RISE_Post Project 10/23/2023
River = BigThompson Reach = BT: Lower RS = 993
Legend
WS 1%
■
Ground
Bank Sta
Legend
WS1%
■
Ground
*
Bank Sta
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 10304 A Manning's of 0.03 is applied to the wash pond.
4730
4720-
4710-
0
ct
a
w
4000
4710
0
ct
a
w
4700
0 1000 2000 3000
Station (ft)
2000 3000
4000
0
Legend
WS
1% -
NoRisePreProject
.
WS 1
% -
NoRisePostProject
-
NoRisePreProject
Ground
-
NoRisePreProject
Bank
Ineff
-
Sta
NoRisePreProject
-
NoRisePreProject
-
NoRisePostProject
■
Ground
-
NoRisePostProject
Ineff
Bank
Sta
-
NoRisePostProject
-
•
NoRisePostProject
5000
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 10000 A Manning's of 0.1 is applied to the base of the Materials Probe
1000
Station (ft)
Legend
WS
1% -
NoRisePreProject
A
WS 1%
- NoRisePostProject
- NoRisePreProject
Ground
-
NoRisePreProject
-A-
Bank
Ineff
-
Sta
NoRisePreProject
- NoRisePreProject
•
-
NoRisePostProject
■
Ground
-
NoRisePostProject
Ineff
Bank
Sta
-
NoRisePostProject
-
NoRisePostProject
5000
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 9458 A Manning's of 0.1 is applied to the base of the Materials Proce
4710
4705-1
4700-
E 4695-
0
ct,
a
w 4690-
4685-
4680-
4675
1000
3000
0
BTR_1A Lower
2000
Station (ft)
Plan: 1) NoRisePostProject 2) NoRisePreProject
Legend
WS 1%
-
NoRisePreProject
A
WS 1% -
NoRisePostProject
-
NoRisePreProject
Ground - NoRisePreProject
Bank
Ineff
-
Sta
NoRisePreProject
-
NoRisePreProject
-
NoRisePostProject
■
Ground
-
NoRisePostProject
A
Ineff-
Bank
Sta
NoRisePostProject
-
•
NoRisePostProject
4000
River = BigThompson Reach = BT: Lower RS = 9149 A Manning's of 0.1 is applied to the base of the Materials Proce
0
1000
2000
3000
Station (ft)
Legend
WS
1% -
NoRisePreProject
WS 1%
-
NoRisePostProject
L .... 1
-
NoRisePreProject
O
Ground
-
NoRisePreProject
•
Bank
Ineff
Sta
-
NoRisePreProject
-
NoRisePreProject
-
NoRisePostProject
■
Ground
-
NoRisePostProject
4
Ineff
Bank
Sta
-
NoRisePostProject
-
NoRisePostProject
4000
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 8628 A Manning's of 0.1 is applied to the base of the Materials Proce
4700
0
cv
4695
w
0 1000 2000 3000
Station (ft)
4720
4715-
4710
4705
4700
0
4695
w
4690
4685
4680
4675
1
( T T 1
r
Legend
WS
1% -
NoRisePreProject
WS 1%
-
NoRisePostProject
-
NoRisePreProject
n
-
Ground
-
NoRisePreProject
Bank
Ineff
-
Sta
NoRisePreProject
-
.n.
•
NoRisePreProject
-
NoRisePostProject
■
Ground
-
NoRisePostProject
♦
Ineff
Bank
-
Sta
NoRisePostProject
-
NoRisePostProject
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 8597 A Manning's of 0.1 is applied to the base of the Materials Proce
Legend
WS
1% -
NoRisePreProject
WS 1%
- NoRisePostProject
i
- NoRisePreProject
Ground -
NoRisePreProject
•
Bank
Ineff
Sta
-
NoRisePreProject
-
NoRisePreProject
-
NoRisePostProject
■
Ground
-
NoRisePostProject
A
Ineff
Bank
Sta
-
NoRisePostProject
-
NoRisePostProject
0 1000
2000 3000
Station (ft)
I
4000 5000
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 8552 A Manning's of 0.1 is applied to the base of the Materials Proce
0
m
>
w
0 1000 2000 3000
Station (ft)
4720-
4710-
4700 -
ti
4690-
4680-
4670 1
0
Legend
WS
1% -
NoRisePreProject
WS 1
% -
NoRisePostProject
-
NoRisePreProject
Ground
-
NoRisePreProject
a
Bank
Ineff
Sta
-
NoRisePreProject
-
NoRisePreProject
-
NoRisePostProject
■
Ground
-
NoRisePostProject
A
Ineff
Bank
-
Sta
NoRisePostProject
-
NoRisePostProject
4000
BTR_1A Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 7651
1 I 7
1000 2000
Station (ft)
Legend
WS
1% -
NoRisePreProject
WS 1%
-
NoRisePostProject
.
-
NoRisePreProject
a
Ground
-
NoRisePreProject
•
Bank
Ineff
Sta
-
NoRisePreProject
-
NoRisePreProject
•
•\.•'\- \ti`l?i\i`N
-
NoRisePostProject
■
Ground
-
NoRisePostProject
Ineff
Bank
Sta
-
NoRisePostProject
-
NoRisePostProject
3000 4000
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 7050
4710-%
4705-
4700-
4695-
0
m
aa)
4690-
4685-
4680-
4675
3000
0 1000 2000
Station (ft)
4715
4710
4705-
4700-
w
4690-
4685-
4680-
4675
Legend
WS
1% -
NoRisePreProject
A
WS 1
% -
NoRisePostProject
-
NoRisePreProject
Ground
-
NoRisePreProject
Bank
Ineff
-
Sta
NoRisePreProject
-
NoRisePreProject
-
NoRisePostProject
■
Ground
-
NoRisePostProject
Ineff
Bank
-
Sta
NoRisePostProject
-
•
NoRisePostProject
4000
BTR_1A Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 6703
t
r
r
t r
r
0 1000
r
i
T
2000
T
Station (ft)
T
I
3000
Legend
WS
1% -
NoRisePreProject
WS 1%
-
NoRisePostProject
-
NoRisePreProject
Ground
-
NoRisePreProject
Bank
Ineff
Sta
-
NoRisePreProject
-
NoRisePreProject
•
-
NoRisePostProject
■
Ground
-
NoRisePostProject
Ineff
Bank
-
Sta
NoRisePostProject
-
NoRisePostProject
4000
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 5853
Legend
WS
1% -
NoRisePreProject
WS 1`)/0
-
NoRisePostProject
-
NoRisePreProject
Ground
-
NoRisePreProject
Bank
Ineff
Sta
-
NoRisePreProject
-
NoRisePreProject
L
-
NoRisePostProject
Ground
-
NoRisePostProject
■
Ineff
Bank
-
Sta
NoRisePostProject
-
NoRisePostProject
•
4670 , r T i , , i
0 1000 2000 3000 4000 5000
Station (ft)
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 5817 BR County Road 396
4670
0
1000
2000 3000
Station (ft)
4000
Legend
WS 1%
-
NoRisePreProject
A
WS 1
% -
NoRisePostProject
-
NoRisePreProject
-
NoRisePreProject
t-
- NoRisePreProject
Ground
-
NoRisePreProject
in
Ineff
Bank
Sta
-
NoRisePreProject
-
NoRisePreProject
Ry
-
NoRisePostProject
-
NoRisePostProject
-
NoRisePostProject
■
Ground
-
NoRisePostProject
Ineff
Bank
Sta
-
NoRisePostProject
-
NoRisePostProject
C.
1
5000
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 5792
0
>
w
Legend
WS
1% -
NoRisePreProject
WS 1`)/0
-
NoRisePostProject
-
NoRisePreProject
Ground
-
NoRisePreProject
Bank
Ineff
Sta
-
NoRisePreProject
-
NoRisePreProject
-
NoRisePostProject
■
Ground
-
NoRisePostProject
Ineff
Bank
-
Sta
NoRisePostProject
-
NoRisePostProject
•
0 1000 2000 3000 4000 5000
Station (ft)
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 5542
4000
0
1000
2000 3000
Station (ft)
Legend
WS
1% -
NoRisePreProject
WS 1
% -
NoRisePostProject
Viii\;l\♦\
.. .. ..
-
NoRisePreProject
Ground
-
NoRisePreProject
A
Bank
Ineff
Sta
-
NoRisePreProject
-
•
NoRisePreProject
I
-
NoRisePostProject
■
Ground
-
NoRisePostProject
A.
Ineff
Bank
-
Sta
NoRisePostProject
-
NoRisePostProject
5000
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 5226
Legend
WS
1% -
NoRisePreProject
e
WS 1%
-
NoRisePostProject
fit:S. .t ..\,• \•��\NS�.\,• ,.\��," ,*Ns'
-
NoRisePreProject
Ground
-
NoRisePreProject
Bank
Ineff
-
Sta
NoRisePreProject
-
NoRisePreProject
-
NoRisePostProject
■
Ground
-
NoRisePostProject
A
Bank
Ineff
-
Sta
NoRisePostProject
-
•
NoRisePostProject
0 1000 2000 3000
Station (ft)
BTR_1A Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 4874
4710
4695
° 4690
a
w
4685
4670 ► , T , , ,
5000
0
1000
2000 3000
Station (ft)
4000
Legend
WS
1% -
NoRisePreProject
WS 1%
-
NoRisePostProject
Ground
-
NoRisePreProject
Bank
-,4L--Ineff-
Sta
NoRisePreProject
-
•
NoRisePreProject
f
Ground
-
NoRisePostProject
A
Ineff
Bank
-
Sta
NoRisePostProject
-
NoRisePostProject
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 4569
w
Station (ft)
Legend
WS
1% -
NoRisePreProject
WS 1%
-
NoRisePostProject
Ground
-
NoRisePreProject
4:
Bank
Ineff
Sta
-
NoRisePreProject
-
NoRisePreProject
Ground
-
NoRisePostProject
■
Ineff
Bank
-
Sta
NoRisePostProject
-
NoRisePostProject
•
0 1000 2000 3000 4000
Station (ft)
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 3839
Legend
WS
1% -
NoRisePreProject
WS 1%
-
NoRisePostProject
- NoRisePreProject
U
Ground
-
NoRisePreProject
Bank
Ineff
-
Sta
NoRisePreProject
- NoRisePreProject
•
1
-
NoRisePostProject
■
Ground
- NoRisePostProject
Ineff
Bank
Sta
-
NoRisePostProject
-
NoRisePostProject
.4
BTR_1A_Lower Plan: 1) NoRisePostProject 2) NoRisePreProject
River = BigThompson Reach = BT: Lower RS = 3242
Legend
WS 1% - NoRisePreProject
WS 1`)/0 - NoRisePostProject
- NoRisePreProject
Ground - NoRisePreProject
Ineff - NoRisePreProject
Bank Sta - NoRisePreProject
- NoRisePostProject
■
Ground - NoRisePostProject
Ineff - NoRisePostProject
`ti'
Bank Sta - NoRisePostProject
ATTACHMENT E
Summary of Water Surface Elevation Changes
Two
Rivers
Sand
and
Gravel
Project
_.nespEc.
COMPARISONS
Cross
Section
ID*
-
Pre -Project
Post -Project
Post -Project
to Pre -Project
0.00
15282
4698.80
4698.80
0.00
14843
4698.23
4698.23
0.00
14014
4697.43
4697.43
12916
4696.09
4696.09
0.00
12612
4695.57
4695.57
0.00
12309
4694.95
4694.95
0.00
12230
4694.63
4694.63
0.00
12166
4694.47
4694.47
0.00
11919
4693.81
4693.81
0.00
10886
4692.70
4692.49
-0.21
10304
4692.33
4692.04
-0.29
10000
4692.11
4691.81
-0.30
9458
4691.66
4691.44
-0.22
9149
4691.20
4691.04
-0.16
8628
4690.44
4690.41
-0.03
8597
4690.41
4690.38
-0.03
8552
4690.34
4690.34
0.00
7651
4688.99
4688.99
0.00
7050
4688.03
4688.03
0.00
6703
4687.64
4687.64
0.00
0.00
5853
4686.20
4686.20
0.00
5792
4685.91
4685.91
5542
4685.60
4685.60
0.00
5226
4685.13
4685.13
0.00
4874
4684.59
4684.59
0.00
4569
4684.09
4684.09
0.00
�
3839
4682.15
4682.15
0.00
4681.59
4681.59
0.00
3242
4681.58
� 4681.58
0.00
3041
4681.37
4681.37
0.00
2320
4681.11
4681.11
0.00
1708
4680.96
0.00
993
4680.96
4680.82
0.00
464
4680.82
4680.60
0.00
0
4680.60
*Cross Section ID represents stream distance in feet from the confluence of Big Thompson River and South Platte River
Section of Proposed Fill
Section of Proposed Cut
ATTACHMENT F
ATTACHMENT 6
REVISION
4700
4895
4890
4685
4680
co
N
N_
'J
At
i
0
4676
130+00
I
Li Y1/4_ - - —
t_ _J ,
I'1 1
I 11�
Ii`- --
125+00 120+00
LEGEND
PRE -PROJECT 100-YR FLOOD
POST -PROJECT 100-YR FLOOD
EXISTING GROUND
EFFECTIVE HEC-RAS CROSS SECTIONS
et Li
I
r►
I1
L --I
115+00 110+00
(Th
105+00 100+00
14,
I
•
,I Il II
v \f t
Ir
1I
41 1.I1
._I ti
95+00 90+00
4700
4695
4690
4685
4680
4676
85+00 80+.00
HORZ 0 200 400
VERT 0 2 4
SCALE IN FEET
W
-1
O
W
Z
o r, W
in
a
STAMP
Know %Mr. below.
Cell Won you dig.
303-666-6657
t
a,
O
O
W
a.
U)
W
Q
DRAWING NUMBER.
Fig 1
ATTACH G
RAPTOR
MATERIALS :.
8120 Gage Street • Frederick, CO 80516
Bus: (303) 666-6657 • Fax: (303) 666-6743
March 24, 2023
Weld County Clerk to the Board
1150 O Street
Greeley, CO 80631
Subject: Raptor Materials LLC Two Rivers Sand, Gravel and Reservoir Project - permit # M-2022-013 —
Fifth Adequacy Response
Attachments:
Fifth Adequacy Response Cover Letter
Updated Exhibit D
Your signature or stamp below acknowledges receipt of the above referenced materials, as attached.
The materials should be added to the above referenced Application, as originally submitted to the Weld
County Clerk to the Board, and made accessible for public review.
Received On , 2023
By:
Office of the Weld County Clerk to the Board of County Commissioners
Pvbl : c Rev; e cJ
04/12/2.3
CG: PL(TP/M11(DA/Ko/DA'
P')(cH /ER/cK/DD/Dt-)
oy /07 /23
RECEIVED
MAR 2 4 2023
WELD COUNTY
COMMISSIONERS
2023- ogSZ
8120 Gage Street • Frederick, CO 80516
Bus:(303) 666-6657 • Fax:(303)666-6743
Friday 24 March 2023
To: Robert D. Zuber, P.E.
Environmental Protection Specialist
Colorado Division of Reclamation Mining and Safety
Office of Mined Land Reclamation (OMLR)
1313 Sherman Street, Room 215
Denver, Colorado 80203
From: Garrett C. Varra, General Manager
Raptor Materials, LLC
8120 Gage Street
Frederick, Colorado 80516
Subject: Two Rivers Sand, Gravel and Reservoir Project, File No. M-2022-013, 112c Permit
Application Adequacy Review #5 REPSPONSE
Dear Rob,
The Division of Reclamation, Mining and Safety (Division/ORMS), Office of Mined Land
Reclamation (OMLR); reviewed the contents of the Original 112c permit application for the Two
Rivers Sand, Gravel and Reservoir Project (TRP), File No. M-2022-013 and submitted comments
via Adequacy Letters of 24 June and 5 August 2023 which were responded to by Raptor
Materials on 6September 2022. Raptor Materials received a Second Adequacy Review dated 17
October 2022 which were responded to by Raptor Materials on 4 January 2023. In addition to
the Second Adequacy Review dated 17 October 2022, DRMS on November 17, 2022 provided
an additional comment on the berm failure analysis included in the application. Raptor
submitted a supplemental response to the Second Adequacy on 2 February 2023 addressing
excavation setbacks from the South Platte and Big Thompson rivers. Raptor Materials received
Third Adequacy Reviews dated 09 February, 10 February and 14 February 2023, which were
responded to on 24 February, 2023. A Fourth Adequacy Review was received 6 March, 23 and a
response submitted 9 March, 2023.
Raptor Materials received a Fifth Adequacy Review dated 21 March 2023. Raptor's fifth
adequacy response below follow the comment from the adequacy review and are highlighted
in blue font for clarity.
DRMS Fifth Adequacy Comment
Raptor Materials, LLC (RM) should revise the Extraction Plan (Exhibit D) to include a paragraph
discussing operation of the conveyor that is proposed to extend from the extraction area to the
processing area and over the Big Thompson River. To protect the Severe Winter Range of Mule
Deer, the conveyor should only be operated between 8 am and 5 pm during the months of
December through April. In addition, construction of the conveyor should also follow this
schedule, and RM should avoid open trenches or pits that could harm animals during
construction of the conveyor. Finally, RM should commit to limiting the use of lights on the
conveyor in the riparian areas.
Raptor has discussed the proposed restriction on operation during the months of December
through April with both Rob Zuber, DRMS Environmental Protection Specialist, and Michael
Grooms of the Colorado Division of Wildlife who had raised this question. Raptor's
understanding subsequent to these conversations is some misunderstanding had taken place
and Mr. Grooms concern was primarily for impacts on wildlife using the riparian corridor along
the South Platte River during winter months. As there is no significant concern with the Big
Thomson River corridor, the need to limit operation of a conveyor crossing the Big Thompson
River riparian corridor between the hours of 8 am and 5 pm did not require further response,
however it remained appropriate to consider the other requests. Raptor has done so with
additional conditions of operation included in Exhibit D — Extraction Plan.
Please find attached the following documents as our response:
- Updated Exhibit D— Extraction Plan (new paragraph on p181
The current decision date is 31 March 2023.
Regards
Garrett Varra
General Manager
Page 11
6.4.4 EXHIBIT D — Extraction Plan
The mining plan shall supply the following information, correlated with the affected
lands, map(s) and timetables:
(a)description of the method(s) of mining to be employed in each stage of the operation
as related to any surface disturbance on affected lands;
(b)earthmoving;
(c)all water diversions and impoundments; and
(d)the size of area(s) to be worked at any one time.
(e)An approximate timetable to describe the mining operation. The timetable is for the
purpose of establishing the relationship between mining and reclamation during
the different phases of a mining operation. An Operator/Applicant shall not be
required to meet specific dates for initiation, or completion of mining in a phase
as may be identified in the timetable. This does not exempt an
Operator/Applicant from complying with the performance standards of Rule 3.1. If
the operation is intended to be an intermittent operation as defined in Section 34-
32.5-103(11)(b), C.R.S., the Applicant should include in this exhibit a statement
that conforms to the provisions of Section 34-32.5-103(11)(b), C.R.S. Such
timetable should include:
(i)an estimate of the periods of time which will be required for the various stages
or phases of the operation;
(ii)a description of the size and location of each area to be worked during each
phase; and
(iii)outlining the sequence in which each stage or phase of the operation will be
carried out. (Timetables need not be separate and distinct from the
mining plan, but may be incorporated therein.)
(f)A map (in Exhibit C - Pre -Mining and Mining Plan Maps(s) of Affected
Lands, Rule 6.4.3) may be used along with a narrative to present the following
information:
(i)nature, depth and thickness of the deposit to be mined and the thickness and
type of overburden to be removed (may be marked "CONFIDENTIAL,"
pursuant to Rule 1.3(3)); and
(ii)nature of the stratum immediately beneath the material to be mined in
sedimentary deposits.
(g)Identify the primary and secondary commodities to be mined/extracted and describe
the intended use; and
(h)name and describe the intended use of all expected incidental products to be
mined/extracted by the proposed operation.
(i)Specify if explosives will be used in conjunction with the mining (or reclamation). In
consultation with the Office, the Applicant must demonstrate pursuant
to Rule 6.5(4), Geotechnical Stability Exhibit, that off -site areas will not be
adversely affected by blasting.
(j) Specify the dimensions of any existing or proposed roads that will be used for the
mining operation. Describe any improvements necessary on existing roads and
the specifications to be used in the construction of new roads. New or improved
roads must be included as part of the affected lands and permitted acreage.
Affected land shall not include off -site roads which existed prior to the date on
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 12
6.4.4 EXHIBIT D — Extraction Plan
which notice was given or permit application was made to the office and which
were constructed for purposes unrelated to the proposed mining operation and
which will not be substantially upgraded to support the mining operation.
Describe any associated drainage and runoff conveyance structures to include
sufficient information to evaluate structure sizing.
Prologue: Extraction of natural resources for rock products is essential to the
well-being of a community. The urban infrastructure served by development of
construction materials is a local and transitional benefit. The more remote
these resources are from the need, the greater the cost to the private and public
community. Unlike fixed urban impacts to the landform and area ecosystems,
reclamation and restoration of extracted lands allow for preservation of natural
buffers, and complementary alteration of both natural and human systems.
Commencing on the family farm in 1948, the Varra family combines nearly
73± years of operational experience that serves as testimony to a history of
sound and thoughtfully executed operations of this kind. For the Two Rivers
Sand Gravel and Reservoir Project, lands not otherwise occupied for Developed
Water Resources will be improved to the highest possible end -use. Post
Extraction Uses beyond the Primary Use of Developed Water Resources will
likely comprise continuing and diverse general agricultural uses; as well as
possible light residential, commercial, or industrial uses; as determined by
right, or as otherwise authorized by the governing authority.
The restoration of above ground lands to native grasses and attending large
water bodies are a baseline asset to area wildlife terrestrials and avifauna.
Beyond good will, there are continuing landowner philosophical and economic
enticements to further benefit area wildlife populations and diversity to further
the value and enjoyment of the modified and surrounding lands. These efforts
laid down over time involve the considerable experience of the landowner, staff,
and other resources, including periodic consultation with the Colorado Division
of Wildlife, the U.S. Natural Resources and Conservation Service, Colorado State
University Natural Resource Departments and Extension Service, and a
multitude of other natural resource professionals; including those highly
qualified organizations and professionals who have already contributed to the
Exhibits included under this application.
Setting: The project area lies along and within the flood plain of the South
Platte and Big Thompson Rivers. The predominant location of extraction is
proximal to the geological delta found near the existing confluence of the two
rivers (hence, the Two Rivers Sand Gravel and Reservoir Project (Two Rivers
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 13
6.4.4 EXHIBIT D — Extraction Plan
Project; or TRP); and overlies bedrock that varies in depths as shallow as 20±
feet in some locations, and more commonly 30-45± feet in depth from the
surface.
The permit area is flanked on its immediate western boundary by agricultural
operations. To the north, residential uses expand, as remnant agriculture
clings to the rising ground. Unfettered agricultural and rangeland uses still
thrive as they extend beyond the permit boundary east, west, and south of the
permit boundary along the alluvial influences of the two rivers. To the
immediate east of the TRP, riverine lands are under active transformation into a
created wetland bank. It should be understood that agricultural practices will
remain active over the project area until converted by resource recovery and
reclamation.
America's first Transcontinental Railroad was being discussed in the 1840's,
and surveyed in the 1850's. The railroads began the transformation of the
American West on 10 May 1869 at Promontory Point, Utah. Railroad routes
were being planned for this location and surrounding lands likely soon after
the end of America's Civil War. The lines planned over the Two Rivers parcels
were never built. Other lines were built nearby, like the Union Pacific's Dent
line, that runs parallel to this day along the south bank of the South Platte
River; and below the TRP.
With area railroads came increased settlement, and with population the nature
of the landscape became modified to complement growing market economies
of agriculture and commerce since the early 1870's. We estimate the lands
hugging the two rivers were farmed and the topography gradually manipulated
for agriculture following the early establishment of Greeley and LaSalle,
Colorado; in 1869-70.
Area crops are commonly in corn, but this has not always been the case. We
postulate that near the onset of the Twentieth Century sugar beet farming
began to feed the demand of area sugar beet mills, further evidenced by
speculative railroad routes over and near the parcel, itself. So, the appearance
of the land that we see today, is commonly different than what it appeared at
the time of settlement.
In order to improve the area and extent of tillable lands, even early agricultural
practices included landform modification to aid the plow. Prior floodplain
modification is evidenced today by the historical placement of utilitarian levees
flanking the existing agricultural fields along the outer cottonwood tree lined
escarpments of each river. The levees are maintained to this day, and form
perimeter access to the rivers and tillable fields.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 14
6.4.4 EXHIBIT D — Extraction Plan
The later creation of farm to market County Road 396 eased access to the
areas' agricultural fields, yet consequentially separates the fields at the TRP
with its graveled surface, and subsequent rights -of -way and easements.
The levees, public roads, cottonwood corridors and area tributaries are visible
in the different map exhibit aerial images, and will not be impacted by planned
extraction. All planned operations have conforming setbacks, and levee access
will remain limited to wheeled vehicles during operations.
Today, the upper terrace where extraction operations are planned, supports
agricultural crops above the lower stream terrace formed further below and
beyond the perimeter levees and cottonwood corridors that frame the adjacent
active stream channels. The Fields designated for resource recovery (Central
Field and North-West Field; as shown on Exhibit C - 2: Extraction Plan Map) lie
over a nearly level upper terrace of the two rivers. The South Platte
River borders the southern and eastern extent of planned extraction, and the
Big Thompson River intersects the permit area north of the Fields.
The stream terrace itself is a riparian area that supports on its flanking
escarpment an uneven aged stand of Cottonwood trees. The uneven aged
trees suggest this segment of the river has experienced some scouring in the
past from periodic, yet commonly limited, flooding; which encourages natural
regeneration of Cottonwoods.
To determine the influence of past activities on groundwater, twelve (12)
Piezometer Wells were located along and within the entire TRP boundary.
Groundwater level information here, is based on 5.75 years of continuous
monthly measurements at twelve (12) piezometer locations identified on the
included Exhibit G: Water Information Map. Recorded groundwater depths
vary in elevation below the surface, with a general (weighted) mean depth of
8.40± feet.
Groundwater elevations are influenced by crop irrigation practices that run
generally from April through September, and may occasionally lag into the
middle of October. During this time groundwater depths maybe skewed
higher in elevation to the extreme North-eastern extents of Central Field, yet
with few exceptions, groundwater elevations over the entire site remain
significantly deeper than 5.11± feet from the surface, year over year, over the
entire TRP area.
Using the approximate surface elevation at the extreme eastern boundaries of
North-West Field and Central Field, and noting that groundwater fluctuations
will commonly meet at 8.40± feet below the surface, yet rarely rise more than
5.11± feet from the surface, we determined the Static Water Level using the
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page IS
6.4.4 EXHIBIT D — Extraction Plan
upper limit of 5.0± feet. The Cyan colored contour shown on Exhibit G: Water
Information Map represents the Static Groundwater Elevation at 4675' at
North-West Field, and 4673' at Central Field. Since completed reservoirs will
be lined to meet State of Colorado Water Resources specifications and
requirements, and since lined basins will ultimately equalize with the
surrounding groundwater elevations, the Static Water Levels shown should
reasonably reflect those of the both the lined or unlined state; and represent
a proper reflection of the optimal surface area of the water over the finished
basins. Raptor Materials, LLC has sufficient water to meet the circumstances
and obligations of both the lined and unlined states; and as reflected under
Exhibit G: Water Resources Information; until and unless the reservoirs have
an approved liner, the Operator will dedicate sufficient waters to secure the
reclamation of the resulting basins in the
unlined state.
Planned Field Activities: The 409.23± acre parcel boundary forms the permit
boundary, as reflected on exhibit maps. All lands under its direct control
within the 409.23± acre permit area, are affected lands under C.R.S. 34-32.5-
103(1), respective of this permit application. As a result, any changes required
in the nature of planned extraction or reclamation will be made only through
the Colorado Office of Mined Land Reclamation (OMLR), by Technical Revision
only. If lands are needed beyond the designated permit boundary, those lands
will be secured for the active OMLR permit by Amendment.
Within the permit boundary, there are two* (2) identifiable areas designated
for primary extraction, the description of which will help to explain the nature
of planned extraction and reclamation. The Primary Areas of Extraction are as
follows:
162.57± Acres = Primary Extraction (***) Central Field: 15-25± years (2023- '48) **
41.04± Acres = Primary Extraction North-West Field: 4-8± years (2045- '53) **
203.61± Acres = Total Primary Extraction
205.62± Acres = Affected Lands beyond planned extraction limits
409.23± TOTAL
(*) NOTE: The third area of secondary extraction is limited to approx. 5.60± Acres for a
Plant Processing/Stockpile Area Pond, as further indicated, below; and is not included in
this total.
(**) NOTE: Final reclamation will add up to five (5.0±) years to the anticipated Life of the
Mine, subsequent to completion of extraction and removal of all marketable
materials. Life of Extraction is an approximation, and could lengthen or shorten the
overall life of the mine depending upon market conditions.
(***) NOTE: Of the 162.57± Acres of Primary Extraction, 4.09± Acres comprise an
existing Farm Yard & Structures with residence. These facilities may be leased or
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 16
6.4.4 EXHIBIT D — Extraction Plan
otherwise utilized as an Office and Support/Storage facilities for Operations, potable
water and sanitation. Lands identified within a designated Extraction Limit may not be
extracted, including the Farm Yard area, as circumstances warrant according to the
discretion of the Operator.
Of the outlying 205.62± Acres:
15.76± Acres = Plant Processing/Stockpile Area
5.60± Acres = Secondary Extraction - Plant Processing/Stockpile Area Wash Pond
21.35± TOTAL
The remaining 184.27± acres of lands within the permitted limits may comprise
planned or existing permanent access roads, levees, previously affected areas,
and areas of minor to no disturbance (including public transportation
corridors, right-of-way's, easements, permanent structures, river and stream
terrace and cottonwood corridor buffer areas), or other farm land features
or structures; or as otherwise determined from included maps and aerials.
These lands may also include essential support operations, including: parked
vehicles, equipment, plant site equipment and processing stockpiles, etc., not
otherwise explicitly indicated or shown, but reasonably associated with
operations of like kind, and may be varied in location and extent over time; or
otherwise, field fit within the permit boundary as warranted.
Wetland conditions appear confined within portions of the stream terrace and
bank -full stage of the rivers, and along segments internal to the Evans
Canal. Extraction will form a depression (basin) within the floodplain as shown
in Exhibit C-2: Extraction Plan Map. Temporary above ground fill may occur
within the floodplain, and as part of this permitted activity, provided the above
ground volume does not exceed the below ground volume created by
extraction. All product stockpiles and processing will occur within the city
limits of Evans under this application, and North and outside of the floodplain
boundary of the 100 -year floodplain of the Big Thompson River. The floodplain
extent will be visually marked in the field to better assure the integrity of the
floodplain.
Material transport of raw materials from extraction locations to the plant site
will occur via conveyor (see route on Exhibit C-2: Extraction Plan Map). This
will in turn serve to minimize impacts to area transportation corridors. The
actual location, extent, and nature of the conveyor systems not otherwise
designated in this submittal will be provided as updates in the required OMLR
Annual Reports.
Known structures and landowners, including above and below ground utility
owners, located on and within 200± ft. of the permit boundary, are shown on
Exhibit C-1: Existing Conditions Map. Exhibit S: Stability Analysis - provides
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 17
6.4.4 EXHIBIT D — Extraction Plan
certification from a registered professional engineer that these structures will
not be harmed by planned extraction profiles and extents.
'For lands within the Extraction Limits, only those structures, easements, and
rights -of -way shown in Exhibit C-2: Extraction Plan Map, are anticipated to
remain from those shown in Exhibit C-1: Existing Conditions Map. If changes
to existing or possible revised structures, easements, or right-of-way are in
any manner retained, or where they might occur subsequent to OMLR
approval of this application, then a Technical Revision will be submitted to
update Exhibit C-2: Extraction Plan Map. All established setback distances
from planned activities to any remaining features will be maintained
regardless.
Operations or related Processing Areas and Wash Pond are not intended to
affect existing structures, Easements, or Right -of -Ways within the Planned
Extraction Limits identified as remaining and are designed to avoid and retain
any remaining structure, Easement or Right -of -Way on the surface, and
subsurface. Future agreements maybe reached allowing mining in areas
currently identified as being restricted to mining containing certain
structures, Easements or Right -of -Ways.
Exhibit C-1 shows and identifies all these features understood by us, and the
respective Surveyed information, and correlated Observation and Title Work
upon which they are based and represented on the attending Maps. The Maps
are not Surveys. They are Maps and as such, they comprise a reasonable
representation of all site features, but must not be relied upon by themselves
exclusively for location purposes. Maps and features are not a substitute for
field identification of underground structures and will rely upon location
services of the 811 service. Setbacks where required will be based on the
actual field locations of site features.
Exhibit C-2 shows the remaining Oil Wells and Lines within Planned
Operations at the time of the Submittal. Any revisions, additions, or
modifications of residual Oil Wells or Lines will be avoided as represented on
updated Maps and Revisions to the Permit, and consistent with Setback
Distances identified in this submittal. Removal of any Existing Structures
such as the Oil and Gas structures and or lines, will be updated on required
Annual Reports, or by Technical Revision, as warranted, or as otherwise
directed consistent with Colorado Statute.
Access to the Theater of Operations: Entry into the permitted areas is
dependent upon the needs and necessary management of continued
agricultural activities during operations, as well as essential management and
1 Adequacy Item 18
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 18
6.4.4 EXHIBIT D — Extraction Plan
mobility within the active areas of extraction, processing; and correlated need
for transportation of human resources, equipment, and product. Human
resources for operations, heavy equipment, and haul traffic will occur based
upon the desired and dynamic activities necessitated by time and
circumstance within the designated Fields. Access points for continued
agricultural, extraction, and plant site operations are shown * on Exhibit C-2:
Extraction Plan Map, as follows (NOTE: Access purpose and usage may change
in time from that indicated here -in. Also, General Existing Dimensions and
length of existing access roads are represented in the aerial images on the
Exhibit Maps relative to the Access locations detailed, below. Modifications
may occur as needed and will be reported in OMLR Annual Reports.):
0
* Entrance 1: Farmstead entrance. Limited Access. Note: Visitors will first access operations
by checking in at an established plant scale -house, not here.
Entrance 2: Primary Access to the lower boundary of Central Field.
Entrance 3: Primary Western Access to the North-West Field.
Entrance 4: Primary Eastern Access to the Wash Pond and designated Plant Site.
Entrance 5: Adjacent Parcel Existing Access.
Entrance 6: Oil & Gas Access into the Western Section of Central Field.
Entrance 7: Primary Eastern Access to the North-West Field.
Entrance 8: Primary Northern Access to Central Field.
Entrance 9: Primary Northern Access into the designated Plant Site location.
Entrance 10: Internal Access from Adjacent Lands.
Entrance X — Agricultural/Mechanical
Entrance WV — Agricultural/Mechanical — Westervelt R -O -W Access to adjacent Wetland Bank
Existing roads outside of the permit boundary are shown on Exhibit C -l:
Existing Conditions Map. Existing on -site internal access roads are also visible
to scale in the aerial information provided under Exhibit C-2: Extraction Plan
Map and other map exhibits included with this submittal. In general,
Operations will predominantly utilize unmodified existing
agricultural field access roads (unless otherwise indicated), which will
themselves be subsequently extracted in time where they fall within the
extraction limits shown on Exhibit C-2: Extraction Plan Map. No other defined
roads within the Extraction Limits will occur except for the temporary paths
created by extraction equipment, or otherwise determined by subsequent
Revision to the permit.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 19
6.4.4 EXHIBIT D - Extraction Plan
All existing agricultural roads outside of the designated extraction limits will be
retained according to the desires of the landowner. The same shall form part
of the final end use of the reclaimed lands, unless otherwise indicated in this
submittal or by subsequent permit revision. For purposes of this submittal, all
lands within the indicated permit boundary will be considered affected lands,
but only those locations between the existing access roads, and which
otherwise remain above the anticipated static water level of the resulting
basins, will be soiled (where soil is absent) and seeded to establish vegetation
consistent with the approved reclamation plan.
Area and Site Soils: Soil formation surrounding and within the project area
varies according to diverse geologic, natural, and man -caused influences. The
United States Soil Conservation Service, Soil Surveys, are the foundation
source for understanding area soils as identified on Soil Survey Maps by their
Soil Unit Number. Unit 3 Soil formations for Weld County are not easily
typified or quantified as other soil units, for a reason; natural and man-made
alteration and use of the land over time.
Planned extraction limits will affect predominantly Unit 3 Soils. Extract from Exhibit I/J.
Unit 3 soils commonly form within floodplains. As a result, differing states of soil formation
may exist within the soil unit designation; such as soils with little horizon development like
Entisols and Inseptisols. Mollisols with deep well -developed horizons may exist in the
minority and the near fringe of planned extraction. Refer to graphic above, and below.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [1121 CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 110
6.4.4 EXHIBIT D - Extraction Plan
Enceptisol Inceptisol
%44-
n t .1\
torr
i tc %'46,
t .
1 1
Soil Morphology
a
N
7
Cs ._
'-let
t_ •
.J 1
s�
yt Y
—.i - ,w.+.a- _�..
Molisol
With over a century of agricultural manipulation of area agricultural fields,
prior mixing or importation of soils for land leveling, or flood plain
management in the creation of levees, may have dramatically altered the
original native soil profiles and properties. The native A profile of the upland
terrace found within the agricultural Fields at the TRP, is predominantly
modified as a plow (Ap) layer of 6.0± to 8.0± inches. The historic practice of
incorporating manure into the plow layer should have served to maintain the
organic base and quality of the cropped soils and accelerated soil horizon
formation and development where it was lagging. Since the cropped soils
have been irrigated, care should be taken not to salvage soils greater than
12.0+ inches in depth to avoid mixing of potential accumulated salts.
Generally, total soil depth (including all soil horizons) over the property may
vary from approximately zero inches to four [4.0±] feet, yet predominantly
having a shallow Ap plow layer of six to eight [6-8±] inches, lacking a B profile
and having the potential for a mixture of silt, clay, or gravel outcrops over
random areas. Gravel depth may occur from the surface to the underlying Fox
Hills Sandstone varying at approximately 30.0± to 45.0± feet over the entire
property. Suitable soil in excess of that needed for reclamation will be made
commercially available to meet area infrastructure and residential demand.
Soils found within the entire project area are described more thoroughly
under Exhibit I - Soils Exhibit, and the attending Exhibit I/J - Soils and
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 111
6.4.4 EXHIBIT D - Extraction Plan
Vegetation Map, shown not to scale, above. Additional geologic
considerations are also included under Exhibit S - Stability Analysis.
Area and Site Geology: The area geology is typified by mixed alluvial and
aeolian development, that is commonly alluvial in nature at lower elevations.
As viewed in the Geologic Timeline and shown in Figure 1, below, the
aggregate deposit is found between the Laramie and Fox Hills Sandstone
formations, both formed during the Upper Cretaceous Period nearly 65
million years ago. The alluvium of the river valleys and aeolian sands that
cap the hills formed of the Laramie formation north of the permit area are
more geologically recent, developing during the Quaternary Period.
Geologic Time - Livescience.com
MILLIONS OF
YEARS"CIO
NOW
0.1
■ S
53
11.x'
1614
t',
.28.E
33:?
41J
49
54.4
ai
665.0
gg+
144
159
ISO
206
227
247
4
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page J 12
6.4.4 EXHIBIT D — Extraction Plan
Figure 1: Area Geology Map
The areas of extraction are in the alluvium whose general morphology, area and extent are better
understood in Figure 1 above, and 2 and 3, below (Colorado Geological Survey).
'y.. a\1. •.�r" •�' i1 i �' r 6L �i-. r,a� t• ..•• J •. • - !r�Y (•rn�t.. �.� •• -, • �
` r �'. ' _ T{,• l`.r♦ 1Py �••
• .r,. ..'�ol�. :40....71:1 •e ..� Tom.. � �i..r��� _ `- 1',_".•r.a ♦ _ ._.a�`�_� .t.�_ ♦ .—^
PIC f:
.., t•sr•
40 tir. emI••• i1r• ` - • • 4, 1 a . .•. _ - �. �• •w +x • _~ li - _ •
11; a :...r.
• ,.1L•d J., •• •fit 9 r �'�'re! • L '•rw • �. a,a• —�.+ • cJ.•+.
Y.•�iyce� ' - A▪ I•1 .i.aTt- • r-_«�R• - i • 0 • + . . — •r•t , '•' •T \ SL.a..� s ••1
• • 1" .�� • t • (- ...• -..1 .. _ - ,I••1+� .«r_ • '� r • — •rl 4 •1••..•
1r.r� •, _I • �; .. `a /•
�•;• • Ai
Z�' -r1 ,... •+ •r t I L •,. •1•I—•7 '• •1' r r •�.1' �s •.t 1i7 re. ....PL.),
r*�4 _ •.`• ,'�' _ %f1.�.. '_�' .; 1 .. •1. ,f• i'lt• i - raw �•• • T-�. i .. .. s 1+•! t y - ', S r •rvf= y• .. r •, • _
! f.
• '• p • { �e-. • — _ '_ �, �r`—•,i.•..• . ;''-'-. • Wit• — •
_. — a r a. 1•11i. J 1
I• Nio. y / • ' • r r • yr . Ii \ • « . • 1 , , .- • • .'i.^ _ •• •, r. ',
•
• J 44"((' � • fir, •.1 .. r• .! j.7
Figure 2: Area Geology 3D Oblique View
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -• COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 1 13
6.4.4 EXHIBIT D - Extraction Plan
CORRELATION OF MAP UNITS
SteRFICIAL DEPOSITS
LThLA -'_:LSE
DEPOSITS
I
ALLfl'L &L
DEPOSITS
I ri f
• ,re.
! • '� `,
Q
.. _ .
, . v.--»- -i.sa aririewe ewer
,.e
_:ails
e .•
4 .. .
4a
: : ::
...aces: -
Of
..::::'
uncorsforn ity
unconfcrn 4it'
GRAVEL EOLLL.N
DEPOSITS DEPOSITS
P .1 tocane
Figure 3: Surficial Deposits relative to areas shown in Figure 2, above.
The aggregate deposits of Qal and Qa2 (Figure 3, above) form the bulk of the
deposit planned for extraction. Depths vary by field from approx. 30 to 45
feet. Depths are shallower as the adjacent hillside rises to the north; while
the deposit dips deeper toward the South -East of each designated Field.
Soil Salvage: Resource recovery will commence by first removing the upper
[A profile/plow layer] six to twelve inches of soil [six (6.0±) inches typical],
combined with existing grass or crop stubble. Removal will utilize scrapers or
excavators, aided by dozers where necessary, and hauled to the Northeast
Section of Central Field. All extraction and surface related activities detailed
in this application will occur under an approved Fugitive Dust Permit issued
by the Colorado Department of Public Health and Environment (CDPHE).
Until resoiling activity occurs, where harvested soils have been stockpiled and
remain undisturbed for reclamation or sale, they will be seeded with the
mixture specified under Exhibit L - Table L-1: Primary/Preferred Revegetation
Seed Mixture. A stabilizing cover of native vegetation may take up to three
years to fully establish the desired cover. In the event the native seed mixture
fails, an optional mixture of predominantly introduced species will be used as
a fall back to better assure a stabilizing cover of vegetation. Still, using the
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 114
6.4.4 EXHIBIT D — Extraction Plan
preferred native seed mixture offers opportunity to gauge the potential
performance of the selected species prior to utilizing it over larger areas
requiring reclamation later in the life of the resource recovery operation.
Once vegetation is established over the initial reclamation soil stockpiles,
they will likely remain untouched for the life of the operation until final
reclamation of remaining affected lands takes place. Where concurrent
reclamation is possible, operations will utilize soil in an over the shoulder
method when practical. In this manner, reclamation is expedited without
increasing soil stockpile volumes while reducing expenditures related to
labor, handling, and time.
2Soil salvaged as stated above will range six to twelve inches in thickness.
Resulting volumes of salvaged soil will range from 131,100± - 262,300±cubic
yards for Central field, and from 33,100± - 66,300± cubic yards for the North
West field. Salvaged soil will generally be stockpiled on top of the Westervelt
soil storage area in the North-East section of Central field. Smaller short-term
stockpiles may be created along the pit edges where regrading is imminent or
in progress and resoling will follow.
Resoling volumes required above the waterline of the lined water storage
will require much less soil. The resoling areas are estimated at 11.19 ± acres
for Central field and 4.76 ± acres for the North West field with volumes at a
nominal six inches of soil cover at 9,027 ± and 3,840± cubic yards
respectively. Excess soil not needed on site maybe sold.
Dewatering: As extraction activity progresses into the aggregate profile,
groundwater must generally be removed in advance through the use of
pumps and subsequent discharge into area tributaries. A complete
dewatering evaluation was performed by AWES in their report of 27 July
2020, as provided at the back of Exhibit G: Water Information. The report
concludes that `the results of analytical and numerical solutions indicate that
the proposed mine dewatering activities will not adversely affect the regional
groundwater hydrology.' The reader is further assured that all discharge of
waters will be conducted under an approved CDPHE discharge permit.
Initial dewatering of the property in preparation for extraction and resource
recovery will occur by establishment of a dewatering pump and/or well in the
Southern boundary near an existing agricultural pond. The point of
discharge is on Exhibit G: Water Information Map. Other discharge locations
may occur in time as needed and otherwise approved under the applicable
2 Adequacy Item 23/32
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 115
6.4.4 EXHIBIT D - Extraction Plan
CDPHE discharge permit requirements. Subsequent CDPHE approved discharge
locations will be field fit and the location updated in the following OMLR
Annual Report.
Active Resource Recovery: Following soil salvage, the balance of the
extractable deposit will be removed to the depth of the unconsolidated or
weathered bedrock, transported by conveyor to the plant site pit run, and
subsequently manipulated as desired by screening, crushing, washing, and
other methods to size and properly dimension the earth product into diverse
merchantable materials for sale. Resource recovery will commence radially
North and East from a point near the existing pond and planned first
discharge point shown near the Southern boundary of Central Field.
There are no fixed sequences or phases scheduled as part of the extraction
plan. Instead, Fields are used instead of Phases to describe the activities, since
each Field can be accessed concurrently instead of sequentially with the
other; as reflected or otherwise updated as part of required OMLR Annual
Reports. Under this method, extraction is 'pulsed.' As such, the rate
of extraction and subsequent reclamation will slow or quicken according to
influences of the markets, weather, and internal logistics. Flexibility in
Operations encourages better outcomes when adapting to changing
circumstance or unexpected field conditions, and may involve actively
working different fields or different parts of the same field as necessary.
'For Two Rivers, there are four Fields, intended as sequential areas of extraction unless market
demands warrant concurrent development:
• 121.86± Acres - Central Field — Center Section
• 15.58± Acres - Central Field — North-East Section
• 25.09± Acres - Central Field - West Section
• 41.04± Acres - North-West Field
Generally, flexibility aids integrity of operations and encourages optimizing
operational activity and subsequent reclamation of affected lands. Therefore,
any method that accelerates the extraction timeline will be utilized, and
should be encouraged to better engage the unpredictable elements and
variables that reasonably affect the capacities of the Operator.
Exhibit C-2: Extraction Plan Map, shows the location and planned extraction
limits, general direction of extraction, and related features described above;
along with features made obvious in the included aerial image of the permit
location and surrounding lands.
3 Adequacy Item 17: Aspects of detail required. Other aspects addressed elsewhere.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 116
6.4.4 EXHIBIT D — Extraction Plan
'Exhibits C-2: Extraction Plan Map and L: Financial Warranty Map, shows Initial
Extraction proposed to begin in the yellow hatch area shown on the Exhibit L
Map, comprising 16± acre. The direction of extraction will follow the
perimeter of the extraction limits in order to establish the perimeter keyway
(dewatering trench') for the 121.86± acre Center Section of Central Field. The
perimeter extraction comprises approximately 70.21± acres and will leave an
approximately 51.65± acre Core, that maybe extracted as needed as keyway
drainage capacity allows. The Initial Extraction area is practical as it has no
encumbrances and is adjacent to the existing pond'.
The initial extraction area is bordered to the South along a near 800± foot
section of oil and gas line that is pending removal; along with the two oil and
gas wells, also pending removal (refer to Exhibit C for ownership details). If
or while this infrastructure is still in place, extraction will not occur within 10
feet of these lines, or 25 feet from the wells, as indicated in the setbacks
detailed below. Below this gas line is an existing pond and well that will be
used as a Settling Basin Area, containing at present a solitary settling basin
and pump as a point of discharge of groundwater. This pond may be
expanded or added to below this line and may then be extracted itself once
discharge is discontinued for Central Field Operations.
Perimeter Keyway Extraction will maintain a perimeter slope no steeper than
1.25H:1V, except for the perimeter shown in red along it's extraction limit,
and respective toe where cut slopes will not exceed 2.00H:1V; as indicated
(refer to Exhibit S: Stability Analysis for additional information). At the toe of
the cut perimeter slope is the keyway that runs below the extracted deposit of
the basin, into the bedrock, which allows the subsurface waters to flow to the
settling basin and discharge pumps necessary to keep the cut basin dry
during a time of extraction and reclamation of the affected perimeter slopes.
The keyway dimensions may vary more or less from 4± to 8± feet in depth
and 4± to 16± feet in width. Extraction must be broad enough to allow
equipment to safely approach the toe and excise the bed dimensions where
the resulting channel is sufficient to convey the groundwaters to the settling
basin for discharge.
Please Note: The graphic representation of the Perimeter Keyway Extraction
and Core are idealized, and may vary in shape, size, and location presented.
Annual Reports will report on the nature and extent of affected lands and
4 Adequacy Item 17: Modified from first adequacy response to better define the mining and reclamation plan and
reference a schedule in Exhibit E.
' Adequacy Item 15: Keyway clarification
' Minor edits in this paragraph in response to third adequacy review, noting updates to Exhibit C-2 and readability.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 117
6.4.4 EXHIBIT D — Extraction Plan
more properly reflect actual conditions on the ground in a given year of
operations.
At anticipated production levels and production only from the Center Section of
Central Field, extraction of the remaining perimeter excavation could take 6-7±
years. Extraction of the core could then commence and take 6-8± years,
overlapping with initial development of the next field. With sequential
development, extraction of the North-East Section of Central Field could take 3-
5± years, the West Section of Central Field 4-6± years, and the North-West Field,
6-8± years. Please Note: The time periods will depend on the actual rate of
production required to meet market demand, and the average annual advance
may also vary with thickness of the sand and gravel and ground conditions. Some
flexibility may also be exercised to optimize operations around or through
existing infrastructure if scheduled for removal.
Table E-1 provides a projection of mine development and regrading/reclamation.
The plan as described in this Exhibit D and also in Exhibit E, is a forecast and
may vary according to market conditions with mining and subsequent regrading
occurring faster or slower, sometimes significantly so. The geology may also
dictate changes in the rate of extraction. If efficiency demands in a higher
production demand scenario, up to four separate areas could be developed in the
manner described simultaneously. Such changes may happen quickly and would
be addressed in the Annual Report. 'In discussing this flexing of production and
scaling operations up or down with OMLR staff, a concern was raised as to
impacts on mule deer habitat if there were separate production areas with a
larger area under active production. This has been addressed as having minimal
impact in a letter from Ron Beane, Senior Wildlife Biologist with wildlife
consultant ERO Resources Corp attached as an addendum to this Exhibit D.
As discussed above and considered in the letter from ERO Resources Corp,
Raptor envisions up to four active mining areas (area of active extraction
operations) of up to 16 acres could be in production simultaneously for an
anticipated maximum active mining area of 64 acres. As noted in the ERO
Resources letter, this area is only a small percentage of the riparian corridor
within and adjacent to the extraction area and while Raptor would not
anticipate exceeding 64 acres of active mining area, small and temporary
variances may occur in response to market demands, coordinating operations
around existing infrastructure, water management, or to ensure safe
operations. The maximum disturbed area will continue to grow over the life of
the operation as the post mining land use is lined water storage and as noted
by the DBMS, until the basin is fully extracted and lined, and a leak test is
' Adequacy Item 17: Wildlife concern
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 118
6.4.4 EXHIBIT D — Extraction Plan
performed and approved by the State Engineer. Progressive regrading and
lining however will be performed and is discussed in Exhibit L.
'The fifth adequacy review requested Raptor address minimization of impacts
to mule deer population in the riparian corridor along the Big Thompson River
during construction of the project and during winter. Raptor commits to
construction activities will only be conducted during daylight hours and to not
leaving open trenches or pits during construction that could result in harm to
animals. Raptor also commits to limiting the use of lights on the conveyor in
the riparian areas.
Additional information is provided under Exhibit C-1: Existing Conditions Map;
which shows all known current and active significant man-made structures
located on or within 200 feet of the permit boundary detailed under including
creeks, roads, buildings, oil and gas facilities [such as tanks, batteries, wells and
lines], and power and communication lines and support structures, easements
and rights -of -way; located over the permitted lands or within 200 feet of the
same. A listing of the adjoining surface owner's names and addresses located
within these areas are listed under Exhibit C Text, correlated with those shown
in the afore -mentioned Exhibit C-1: Existing Conditions Map.
The extraction limits assure through the use of setbacks that other interests are
not affected by planned extraction. Extraction is set back uniformly at a
minimum 10.0± feet from the edge of property lines; easements and rights -of -
way; underground gas lines or other underground facilities, irrigation ditches
and seep ditch, wells and other structures. 'Minor variations may occur in the
field over time from those represented on Exhibit Maps. The plans detailed in
this application are based upon future events for which minor or temporary
departures at any point in time maybe evident. To the extent any significant
departure in the field occurs in a time and manner not otherwise anticipated in
these exhibits, the operator may cure by self -inspection, by observation from
OMLR inspection in a timely manner, or by operator -initiated Revision to the
Permit or otherwise via clarification in attending required OMLR Annual
Reports.
Extraction will not occur closer than 125± feet10 from the face of a residential
structure; unless there is a written accommodation with the owner of the
residential structure that allows extraction to occur within a closer stated limit.
Extraction will occur no closer than 25± feet from well heads and related above
ground facilities. Extraction around well heads will be concurrently backfilled
to maintain a 100± foot buffer from the balance of extracted lands. At all
' Fifth Adequacy Response
' Adequacy Item 21
10 Adequacy Item 22
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 119
6.4.4 EXHIBIT D — Extraction Plan
times, safety will take precedent and over -ride all other conditions in time with
a matter of safety or emergency respective to any and all aspects of the
approved permit.
To minimize the potential of river capture, planned setbacks from the two rivers
was evaluated by Flow Technologies (refer to report at the back of Exhibit G:
Water Information - titled: 'Two Rivers Riverside Berm Failure Analysis and Flood
Control Mitigation Plan' of 22 January 2020). The report finds:
`... that head cutting/erosion will not progress through the full length of
a 100 -ft riverside berms. It is important to note that should a flood occur
that results in head cutting/erosion of a riverside berm, Varra
Companies, Inc. will act diligently to restore the damaged areas to pre -
flood conditions.
As mentioned, this analysis is conservative and riverside head
cutting/erosion is based on the 100-yr flood. There is a small probability
that such a flood event could occur during extraction and when the pit is
dewatered.
The DRMS in a supplemental adequacy response dated November 17, 2022
challenged the validity of the engineered design approach taken by Flow
Technologies despite having accepted it as valid in the past. Raptor Materials
believes the approach is valid and is in the process of performing an analysis
by alternate methods incorporated in HEC-RAS. This, however, will take time.
Raptor has per DRMS suggestion decided to adopt the 400 -foot setback from
the top of the riverbanks to the top of the pit -side slope based on guidance
developed using generic and non -site -specific empirical methods as adopted by
the Mile High Flood District whose jurisdiction does not include the proposed
operation. Raptor Materials intends after permit approval to present the results
of the ongoing engineering evaluation as a Technical Revision to obtain relief
from what we are confident are extreme setbacks.
During extraction, a predominantly vertical advancing pit wall (the extraction
front) is not anticipated due to the use of excavators in the removal of the
material deposits. Excavators provide a great deal of control over the
extraction process. The maximum length of the extraction front will likely
never exceed the length of one side of a quarter section of land, or 1,320± feet,
or less; in any given direction. The advancing front will result in a moving face
with a slope typically equal to or flatter than 1.25H:1V, and commonly not
greater than 1.25H:1V along the perimeter of the extraction limits to depth.
The exception to cut perimeter slopes is shown with a distinct Red Boundary on
Exhibit C-2: Extraction Plan Map, where cut slopes will not exceed 2H:1V in
order to maintain integrity and stability along that designated perimeter area
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 120
6.4.4 EXHIBIT D — Extraction Plan
(refer to the AWES Slope Stability Analyses of 23 December 2019, located at the
back of this exhibit). Internal transport of extracted materials to conveyor
systems or other internal transport; or otherwise by approved public roadways,
will be used in the transportation of extracted materials to the designated
plant/stockpile location, described in greater detail, below.
Acreage to be affected during the first year of extraction activities include the
establishment of the initial Wash Pond and attending Settling Pond(s), Plant
Site, and Initial Areas of Extraction and attending means of transportation by
ground haulage or conveyor. While the acreage required for the Plant Site and
Wash Pond are not expected to change, the Initial Area of Extraction will
expand until concurrent reclamation follows as each location is exhausted of
resource.
Although initial extraction may otherwise result in temporary slopes up to
I.25h:ly, all cut slopes will be backfilled with unconsolidated bedrock,
overburden (on -site unmerchantable excess materials, or imported inert
materials) and soil to advance the reclamation and completion of the desired
basins. Final reclaimed slopes and grades will be concurrently
established where practical to 3h:lv, or flatter, and at a minimum from 5± feet
above to 10± below the expected water level of each location of extraction, and
to the basin floor.
Concurrent backfilling and grading of cut perimeter slopes, while desirable,
maybe obstructed in time and extent by the need to maintain keyways and
basin discharge during extraction. Backfilling of slopes can only occur once
enough of the floor is exposed to facilitate backfilling and finished grade of
extracted basin slopes without interfering with basin discharge
operations. This makes concurrent backfill difficult to accurately forecast.
Regardless, any completed slope remediation will be indicated in any
subsequent OMLR Annual Report.
Cut slopes will cause direct precipitation to drain internally into the resulting
basins and are not anticipated to result in any off -site impacts due to erosion
or stormwater runoff. The gentle to near flat topography of the area
landscape tends to aid in overall stability above the planned areas of
extraction. While some erosion of resulting basin perimeter slopes will be
evident subsequent to extraction, the advance of reclamation activity over
affected lands will provide cover for both near and long-term stability of those
lands remaining above water level of the finished basins. All completed slopes
above the anticipated static groundwater elevation will be soiled, seeded and
stabilized as provided for under Exhibit E - Reclamation Plan.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112J CONSTRUCTION PERMIT APPLICATION -COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 121
6.4.4 EXHIBIT D — Extraction Plan
Of the total 203.61± acres of potential extraction, the resulting basins will
function as multiple -use reservoirs with a slightly fluctuating combined water
surface area covering 187.66± acres. The remaining balance of 37.3± acres of
land above the anticipated high-water mark of the reservoirs, and not otherwise
committed to existing or planned structures or infrastructure over the parcel,
will be stabilized with vegetation; including the anticipated 15.95± acres of
basin slopes reflected in the total.
NOTE: Shoreline irregularities and fill to establish and enhance the aesthetic
and end -use functions of the resulting basins shown on Exhibit F: Reclamation
Plan Map, are illustrative only, as this effect as to location and extent will be
field -fit where practical, and may substantively different from that portrayed
under the application. The actual location and extent will be identified in
subsequent OMLR Annual Reports, and absent there, at the time of any
applicable release of a location in part or whole from the permit. Since
representations cannot be accurately portrayed in advance, Exhibit F simply
identifies the near maximum extent [typical] of the resulting basins or ponds
and the potential for shallows during lining and finished grading.
The estimated timetable for extraction, commencing approximately spring to
winter 2023; is estimated to take 23-28± years combined, or longer, followed by
an additional five years to complete reclamation; or a total estimated life of the
mine of 28-33± years; ending approximately winter 2051 to 2056. This is a life
of the mine operation and all timetables are estimates and may prove shorter
or longer than stated. The final determination will occur five years after the
deposit is exhausted and all marketable product has been removed and
necessary infill completed at the location to the point of final reclamation as
approved or modified under the terms of the permit is completed.
This submittal is unable to fully forecast the maximum extent of affected
land expected at any given point in time, beyond an annual basis. As
operational extraction and reclamation efforts will vary annually, the timing
of extraction, reclamation, and life of operation as forecasts must be based
on an initial estimate [refer to Exhibit L - Reclamation Costs], then
subsequently verified and adjusted as reasonably determined at the time of
the required OMLR Annual Report. If justified by field conditions, a rider to
the warranty would follow in due course to reflect current or forecast
conditions where such conditions cannot be reasonably attenuated in a
timely manner prior to the due date of the next year's Annual Report. This
will serve to assure flexibility and confidence in continued operations until
completion of the desired end use.
Additional information on the reclamation and restoration of affected lands is
identified under Exhibit E: Reclamation Plan. All reclamation will follow
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 122
6.4.4 EXHIBIT D — Extraction Plan
guidelines established under Exhibit E - Reclamation Plan and Exhibit I/J: Soils
and Vegetation Information, until and unless otherwise revised. To the extent
possible, pond bottoms will be left rough, with the possible introduction of
logs or other non -putrescent inert material to aid in aquatic habitat and cover
[Refer to Exhibit H - Wildlife Information].
Plant Site Development & Operations: Plant operations are generally
comprised of portable equipment. A small wash pond will be established near
the onset of extraction operations as shown in Exhibit C-2: Extraction Plan
Map. Deposit materials are predominantly transported or conveyed from the
extraction areas to the plants or surrounding yard, where subsequently
processed and scaled for sale. Pit -run (unprocessed materials) may also be
loaded and transported directly from the extraction areas to area markets as
needed and where appropriate. Plant Site operations may also receive and
process materials, and utilize fresh water supply, sourced from locations
outside of the permit area or planned areas of extraction. Provisions for a
material processing plant may at some point be joined by complementary
processing that may include periodic use of on -site recycling facilities.
While recycling activities may occur within the approved plant site/stockpile
location; concrete and/or asphalt batch plant facilities and locations are not
presently determined or sought at the time of this submittal. Due to the
extended life of the mine the Operator desires an essential flexibility to
complement future area needs according to permit requirements and
approvals applicable at the time should such facilities be sought. Any facility
development of this kind will be determined at that time as identified in a
later Technical Revision to the OMLR under the approved permit. These
potential activities are mentioned here solely for purposes of transparency in
establishing these activities as acceptable, normal, and necessary activities to
meet and facilitate the delivery of essential construction material needs of the
area which may occur over time during the life of the approved OMLR
Construction Materials Permit Operations.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page I23
6.4.4 EXHIBIT D — Extraction Plan
Initial Plant Site Theater as seen in Exhibit C-2: Extraction Plan Map
With the exception of the wash pond, whose margins follow existing surface
elevations; all plant site processing activities will occur on upland areas
outside of the existing 100 -year floodplain. These lands occur north and
north-west of the existing Evans Ditch as it winds north of the Big Thompson
River.
Plant activities will require a wash plant and attending wash pond to recycle
wash water and receive discharge silts and other reject fines from the washed
product. Plant and Wash Pond areas are identified on Exhibit C-2: Extraction
Plan Map. The wash pond will function as recycling wash water and receiving
basin for reject fines for the intended Plant/Processing activities. Since the
basin functions in a closed system, it will not require dewatering.
Once the wash pond is established, wet plant operations can be created and
join any dry plant activities in progress. Dry Plant operations can be readily
established since water is not integral to their operations. Once established,
wash pond water will function as a closed system. Settled materials from
wash Ponds will be utilized as product or for reclamation as desired.
Platt equipment will include, but is not limited to, a crusher, screens, and
conveyors, scale house and scale, and attending equipment. Resulting
stockpiles of pit run and processed products may be temporarily stockpiled
here with processed stockpiles, or combined as needed, until transported to
market.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 124
6.4,4 EXHIBIT D — Extraction Plan
"The conveyor will be set on an elevated structure at varying heights to be
situated about the 1 in 100 -year flood level. An average height of 7 feet is
expected. The conveyor will be supported by legs at intervals of approximately
40 feet with typically 6- x 2- x 2 -foot concrete blocks sitting on ground surface
used as necessary to anchor the legs. The conveyor will span the river channel
and metal (or other appropriate material) pans will be installed under the
conveyor structure to prevent spillage into the river. The design will be similar
to other Raptor locations where an extended span has been required to cross a
county road. Final conveyor specifications are to be determined however belt
width is anticipated in the range 24-36".
Ultimately, once the wash plant activities near the completion of extracted
deposit material, the closed system wash pond will fill with silt and be
revegetated in a manner consistent with Exhibit E - Reclamation Plan. Interim
clean out of the wash pond will occur until that point, returning the inert
materials to the bottom of exhausted pits, or utilizing it in part or in whole as
product, or for purposes as substitute soil, soil additive, or as subsoil for
reclamation.
Plant and material processing activity will divide materials into diverse and
dynamic product stockpiles that will come and go with unpredictable
variations in sale and production. To the extent possible, product material
will surround plant activities to further lessen visual and noise impacts to
surrounding properties.
Plant placement will assure that plant noise is well below that of the nearby
traffic. Relative to noise, traffic travelling on area roads at 55 mph or above is
approximately 70.0± decibels within 100 feet from the centerline of the
Highway. Noise at ground zero at a cone crusher, as measured by a hand-
held meter, is at 80.0± decibels, dropping to 70.0± decibels at I00.0± feet from
the center. The level drops an additional 5.0± decibels for every 100.0± feet
from the center of the crusher and surrounding plant noise, achieving
residential background levels at a total setback of 400± feet.
Backup sirens and heavy equipment averaged 60.0± to 75± decibels, with
similar decreases in decibel readings from the source measured in a manner
similar to that indicated for the crusher and plant equipment sources. Plant
stockpiles will aid muting of plant sourced noise just as noise levels at areas
of extraction are buffered with increasing depth of extraction.
The location of the portable scale and scale house and correlated internal
traffic at the plant site location will vary depending upon production levels
and areas needed for product stockpiling. Regardless, the scale house will be
" Adequacy Item 24
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION -COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
Page 125
6.4.4 EXHIBIT D — Extraction Plan
located along internal paths for haul trucks, where finished material will be
weighed and disembarked to help build the urban matrix of roads, highways,
foundations, and desirable neighborhoods communities most desire.
For a diverse list of products to be extracted and/or processed, and sold, they
may include but are not limited to the more common products identified
under Table DI - Earth Products, or other inert or commonly useful products
used for diverse construction purposes, including, but not limited to: structural
fill, concrete products, road construction products; and other products to aid
the residential, commercial, industrial customer; and for any other
infrastructure use. Explosives - will not be utilized.
VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2022
A REGULAR IMPACT [112] CONSTRUCTION PERMIT APPLICATION - COLORADO DIVISION OF RECLAMATION MINING & SAFETY
OFFICE OF MINED LAND RECLAMATION
go
COLORADO
Division of Reclamation,
Mining and Safety
Department of Natural Resources
NOTICE
Pre -Hearing Conference and Formal Board Hearing
DATE: March 17, 2023
TO: Weld County Commissioners
1150 O. Street
Greeley, CO 80631
RE: Two Rivers Sand, Gravel and Reservoir Project, File No. M-2022-013
RECEIVED
MAR 21 2023
WE D COUNTY
COMMISSIONERS
As required by Rule 1.6.1(3)(c) of the Construction Material Rule, please find attached the notice of Pre -
Hearing Conference and Formal Board Hearing for the above referenced permit application.
The application, as well as all other permit documents, can be found at this link:
https://dnrweblink.state.co.us/drms/search.aspx?cr=1
For the Two Rivers documents, type "M2022013" in the Permit No field. A user guide is available to
help first time uses of the imaged document system at this link (go to Imaged Document Data and look
for Laserfiche Web Link User Guide):
https://drms.colorado.gov/data-search
Physical: 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106
Mailing: DRMS Room 215, 1001 E 62nd Ave, Denver, CO 80216 https://drms.colorado.gov
Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director
Pu6t;C Reviet,J cc: PL(TP/MN/DA/Ko/DA)
PW (GWERlc1doptoN),
O4/10/23 04 /04 /23
2023-0958
S0
March 17, 2023
COLORADO
Division of Reclamation,
Mining and Safety
Department of Natural Resources
Re: Final Notice of Pre -Hearing Conference, Recommendation Date and Formal Board Hearing for a
112c Reclamation Permit Application with an Objection; Raptor Materials LLC;
Two Rivers Sand, Gravel and Reservoir Project, File No. M-2022-013
Dear Party and/or Interested Person:
The Division of Reclamation, Mining and Safety (Division/DRMS) appreciates you taking the time to
participate in the review process of the above referenced permit application. The application for the
Two Rivers Sand, Gravel and Reservoir Project was submitted by Varra Companies, Inc. on April 4, 2022.
(The applicant was subsequently changed to Raptor Materials LLC.) The application was considered filed
for review on April 18, 2022. The public comment period for the application closed on June 2, 2022.
The review period for the application will close on March 31, 2023.
The Division received 11 timely objections to the application. One objection was withdrawn leaving 10
objecting parties. Therefore, pursuant to Rules 1.4.9(2)(a) and 1.7.4(2), the Division scheduled the
application for consideration by the Colorado Mined Land Reclamation Board (Board).
The Division's authority is limited to enforcement of the Colorado Land Reclamation Act for the
Extraction of Construction Materials, 34-32.5-101, et seq., C.R.S. (Act) and the Mineral Rules and
Regulations of the Colorado Mined Land Reclamation Board for the Extraction of Construction Materials
(Rules). Copies of the Act and Rules are available through the Division's website at:
https://drms.colorado.gov/rules-and-regulations.
Pre -Hearing Conference
The Pre -Hearing Conference will be held to describe the Division's review process, to explain the rights
and responsibilities of parties, to discuss and resolve issues to the extent possible, to describe the Board
Hearing process, to propose a list of issues under the Board's jurisdiction, to simplify the list and to
identify parties. The Board appointed Erica Crosby to preside as the Pre -Hearing Conference Officer.
In preparation for the Pre -Hearing Conference, all parties are strongly recommended to review Rules 2.6
and 2.7. At the Pre -Hearing Conference, all parties must provide the Division with an electronic copy of
potential witnesses and exhibits for the Board Hearing. Pursuant to Rule 2.6(2)(a), the list must include
each witness name, current address, and phone number, area of expertise (if an expert witness) and the
subject matter of the testimony.
Pursuant to Rule 2.6(2)(b)(i), for any materials not already in the Division's public files, all parties must
provide complete copies of any exhibits for the Board Hearing.
Pursuant to Rule 2.6(2)(b)(ii), for any materials already in the Division's public files, all parties must
provide copies of the list of materials to be used with sufficient specificity to describe the exhibit,
including but not limited to, the specific title or description of each exhibit. The list must also specify
where other parties may review and obtain a copy of each exhibit.
Physical: 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106
Mailing: DRMS Room 215, 1001 E 62nd Ave, Denver, CO 80216 https://drms.colorado.gov
Jared S. Polls, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director
Two Rivers Sand, Gravel and Reservoir Project
Final Notice of Board Hearing
Page 2 of 3
March 17, 2023
Pursuant to Rules 2.6(2)(b)(i) and (ii), each party to the hearing shall provide copies of all materials
mentioned above to all other parties to the hearing. All witness and exhibit lists, exhibits, motions and
responses to motions for this application shall be submitted via email to the Board Administrator, Camie
Mojaratdnr_drms_mlrb-submittals@state.co.us. Please ensure all materials submitted to the Board
Administrator are in a PDF format. Materials provided through file sharing services will not be accepted.
Pursuant to Rule 2.7.3(4), any party who does not attend the Pre -Hearing Conference forfeits its party
status and all associated rights and privileges, unless such party provides a fully executed proxy
authorization form to the Pre -Hearing Conference Officer and the party's authorized representative is
present. An official proxy authorization form is available on the Division's' website at:
https://drive.google.com/file/d/1oaUOJvDsgWeHN ryJjZi6BXfzyYjTdvw9/view
The Pre -Hearing Conference will be held in person at 1313 Sherman Street, Room 318, Denver,
Colorado. If you have good cause not to appear in person you must submit a request to the Division to
appear virtually (via ZOOM). To do so, please submit an email to the Division, no later than 5:00 PM on
March 24, 2023 for Division consideration. If approved you will receive an authorization code to attend
the meeting for this matter. Otherwise, the Pre -Hearing Conference will be held in -person:
Event:
Pre -Hearing Conference
Date:
Wednesday April 5, 2023
Time:
1:00 pm to 2:00 pm
Location:
1313 Sherman Street, Room 318, Denver, Colorado
Formal Board Hearing:
Pursuant to Rule 1.4.9(2)(c), on or before March 31, 2023, the Division shall issue its recommendation to
the Board for approval, approval with conditions, or denial of the application. A copy of the Division's
recommendation will be forwarded to all parties and interested persons.
The application will be considered by the Board during a formal hearing, scheduled for the April 19-20,
2023 Board meeting, beginning at 9:00 a.m., or as soon thereafter as the matter can be considered. During
the hearing, the Board will consider the application with an objection and may decide to approve, approve
with conditions or deny the application. Pursuant to Rule 2.8.1(1), any party who does not attend the Board
hearing forfeits its party status and all associated rights and privileges.
The Board hearing will be held in person at 1313 Sherman Street, Room 318, Denver, Colorado. If you
have good cause not to appear in person you must submit a request to the MLRB to appear virtually (via
ZOOM). To do so, please submit an email to the MLRB Administrator, no later than 5:00 PM on April 7,
2023 for Board consideration. If approved you will receive an authorization code to attend the meeting
for this matter. Otherwise, the Formal Board Hearing will be held in -person:
Two Rivers Sand, Gravel and Reservoir Project
Final Notice of Board Hearing
Page 3 of 3
March 17, 2023
Event:
Formal Board Hearing
Date:
April 19-20, 2023
Time:
9:00 am (start)
Location:
1313 Sherman Street, Room 318, Denver, Colorado
Please note only Parties and those who will be testifying may attend the Board Hearing. All other interested
persons may view the hearing via the Board's YouTube Channel:
https://www.youtube.com/channel/UCDrrAO8bIPFIOwce-yH1fWA.
If you have any questions, please contact me at Division of Reclamation, Mining and Safety, 1313
Sherman Street, Room 215, Denver, CO 80203; by telephone at 303.866.3567 x 8113; or by email at
rob.zuber@state.co.us.
Sincerely,
Robert D. Zuber, P.E.
Environmental Protection Specialist
Ec: Michael Cunningham; Division of Reclamation, Mining and Safety
Russ Means; Division of Reclamation, Mining and Safety
Jeff Fugate; Attorney General's Office
Hello