HomeMy WebLinkAbout20170053.tiff112 CONSTRUCTION MATERIALS PERMIT
AMENDMENT APPLICATION NO.2 (AM -02)
FOR
DRMS PERMIT NO. M-2015-030
CHAVERS MINING RESOURCE
12367 COUNTY ROAD 8
FORT LUPTON, WELD COUNTY, COLORADO
Prepared by:
ASPHALT SPECIALTIES CO., INC
10100 DALLAS STREET
HENDERSON, COLORADO 80640
303-289-8555 • Fax 303-289-7707
ASPHALT
01/9/2_1-1
SPECIALTIES CO.
January 2024
RECEIVED
JAN 17 2024
WELD COUNTY
COMMISSIONERS
c,e; I?L (eR/K14 p nr4 I la l DAB, XO1 - ba53
P 4 (Ck}IeK(DDi t -t B), LA (BBk %iA5IF-c B4-10
01/25/29
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page ii
TABLE OF CONTENTS
Section Page
INTRODUCTION 1
6.4.3 EXHIBIT C - PRE -MINING AND MINING PLAN MAP(S) OF AFFECTED
LANDS 2
6.4.4 EXHIBIT D - MINING PLAN 3
6.4.4 (A) DESCRIPTION OF THE METHOD(S) OF MINING 3
6.4.4 (B) EARTHMOVING 3
6.4.4 (C) WATER DIVERSIONS AND IMPOUNDMENTS 3
6.4.4 (D) SIZE OF AREA(S) TO BE WORKED ON AT ANY ONE TIME 4
6.4.4 (E) APPROXIMATE TIMETABLE FOR MINING OPERATION 4
6.4.4 (F) STRATIGRAPHY 4
6.4.4 (F)(i) Nature of Deposit 4
6.4.4 (F)(ii) Nature of Stratum beneath Deposit 4
6.4.4 (G) COMMODITIES MINED/EXTRACTED AND INTENDED USE 4
6.4.4 (H) INCIDENTAL PRODUCTS MINED/EXTRACTED AND INTENDED USE 5
6.4.4 (I) EXPLOSIVES 5
6.4.4 (J) DIMENSIONS OF EXISTING OR PROPOSED ROADS 5
6.4.5 EXHIBIT E - RECLAMATION PLAN 6
6.4.5 (1) PREPARATION OF THE RECLAMATION PLAN 6
6.4.5 (2) RECLAMATION PLAN REQUIREMENTS 6
6.4.5 (2)(a) Description of Reclamation Plan 6
6.4.5 (2)(b) Land Uses in the Vicinity 8
6.4.5 (2)(c) Reclamation Performance Standards 8
6.4.5 (2)(d) Revegetation Plan 13
6.4.5 (2)(e) Schedule for Implementation 14
6.4.5 (2)(f) Description of Reclamation Details 14
6.4.6 EXHIBIT F - RECLAMATION PLAN MAP 15
6.4.7 EXHIBIT G - WATER INFORMATION 16
6.4.7(1) IF OPERATION IS NOT EXPECTED TO DIRECTLY AFFECT SURFACE OR
GROUNDWATER 16
6.4.7(2) IF OPERATION IS EXPECTED TO DIRECTLY AFFECT SURFACE OR
GROUNDWATER 16
6.4.7(2)(a) Surface Water and Groundwater Systems Affected by Operation 16
6.4.7(2)(b) Known Aquifers 16
6.4.7(2)(c) Dewatering Operations and Runoff 16
6.4.7(3) PROJECT WATER REQUIREMENTS 16
6.4.7(4) REPLACEMENT WATER SOURCES 16
6.4.7(5) NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)
PERMIT 17
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page iii
TABLE OF CONTENTS (CONTINUED)
Section Page
6.4.12 EXHIBIT L - RECLAMATION COSTS 18
6.4.12(1) COST ESTIMATE 18
6.4.12(2) ADDITIONAL DATA TO SUBSTANTIATE COST ESTIMATE 18
6.4.13 EXHIBIT M - OTHER PERMITS AND LICENSES 19
6.4.17 EXHIBIT Q - PROOF OF MAILING NOTICES TO BOARD OF COUNTY
COMMISSIONERS AND CONSERVATION DISTRICT 20
6.4.18 EXHIBIT R - PROOF OF FILING WITH COUNTY CLERK & RECORDER 21
6.4.18 EXHIBIT S - PERMANENT MAN-MADE STRUCTURES 22
ATTACHMENTS
ATTACHMENT 1 AFFIDAVIT FOR CLEAN AND INERT MATERIAL BACKFILL
ATTACHMENT 2 GROUNDWATER MONITORING AND MITIGATION PLAN
ATTACHMENT 3 INTEGRATED NOXIOUS WEED MANAGEMENT PLAN
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 1
INTRODUCTION
This Amendment No. 2 (AM -02) has been prepared for the Asphalt Specialties Co., Inc. (ASCI)
Chavers Mining Resource (Site), Colorado Division of Reclamation, Mining, and Safety (DRMS)
Permit No. M-2015-030, to revise the reclamation plan from the currently approved sealed water
storage reservoir to rangeland use after backfill and expand the affected area within the permit
boundary for surface use disturbances. The Site is located at 12367 County Road 8, Fort Lupton,
Weld County, Colorado in Section 18, T1N, R66W. The format is based on the Mineral Rules and
Regulations of the Colorado Mined Land Reclamation Board for the Extraction of Construction
Materials, Effective July 15, 2019 (Construction Materials Rule, 2019), Rule 6: Permit Application
Exhibit Requirements, Section 6.4 Specific Exhibit Requirement -112 Reclamation Operation. The
following is a list of the specific exhibits being amended, partially or entirely, in this application.
6.4.3 Exhibit C — Pre -Mining and Mining Plan Map(s) of Affected Lands
6.4.4 Exhibit D — Mining Plan
6.4.5 Exhibit E — Reclamation Plan
6.4.6 Exhibit F — Reclamation Plan Map
6.4.7 Exhibit G — Water Information
6.4.12 Exhibit L — Reclamation Costs
6.4.13 Exhibit M — Other Permits and Licenses
6.4.17 Exhibit Q — Proof of Mailing Notices to Board of County Commissioners and
Conservation District
6.4.18 Exhibit R — Proof of Filing with County Clerk & Recorder
6.4.19 Exhibit S — Permanent Man-made Structures
Per Construction Materials Rule No. 1, Section 1.10.1(1), applicable information which would
duplicate previous submittals has not been included in this application. The following table lists
where the currently approved exhibits not being amended can be found:
6.4.1 Exhibit A — Legal Description
AM -01 (2017)
6.4.2 Exhibit B — Index Map
AM -01 (2017)
6.4.8 Exhibit H — Wildlife Information
AM -01 (2017)
6.4.9 Exhibit I - Soils Information
AM -01 (2017)
6.4.10 Exhibit J — Vegetation Information
AM -01 (2017)
6.4.11 Exhibit K — Climate
Original Application (2016)
6.4.14 Exhibit N — Source of Legal Right to Enter
AM -01 (2017)
6.4.15 Exhibit O - Owners(s) of Record of Affected Land (Surface Area)
and Owners of Substance to be Mined
AM -01 (2017)
6.4.16 Exhibit P — Municipalities Within Two Miles
AM -01 (2017)
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 2
6.4.3 EXHIBIT C - PRE -MINING AND MINING PLAN MAP(S) OF
AFFECTED LANDS
The following Exhibit C — Pre -Mining and Mining Plan Map(s) (i.e., Exhibits C-1 and C-2) of
Affected Lands have been revised to reflect updates/changes from the previous submittal based on
current conditions, as applicable, for:
(a) Updated — All adjoining surface owners of record;
(b) Not Applicable — No change/update from previous submittal.
(c) Updated — The existing topography of the area with contour lines of sufficient detail to portray
the direction and rate of slope of the affected land.
(d) Updated — The total area to be involved in the operation, including the area to be mined and
the area of affected lands.
(e) Not Applicable — No change/update from previous submittal.
(f) Not Applicable — No change/update from previous submittal.
(g) Updated — Permanent man-made structures contained on the area of affected land and within
two hundred (200) feet of the affected land .
(h) Not Applicable — No change/update from previous submittal.
(i) Not Applicable — No change/update from previous submittal.
EXISTING ALLUVIAL WELL
(OWNED BY APPLICANT)
�11gi11
Jr,L UTILITY EASEMENT
WOE -War
147119100003 lir��— �!+
COLORADO • DEPT OF HIGHWAYS - .�_ ����� _ -_ --. arc
:,
U1yI
��� MCADA DIILLINO FLtf�s INc � ' �;��\UfCak
-f,/ SE CORNER OF THE SW 1/4 \k�1
t� t!•`! SECTION 18, TIN, R66W 1 "
REVISIONS
DESCRIPTION
1.0 Map updated with adjoining surface owners of record, revised
affected area boundary, and permanent man-made structures
contained within affected land and within two hundred (200) feet
(O&G structures left on map to document pre -mining conditions) -
1 /132024
1/13/2024
Asphalt Specialties Co., Inc.
10100 Dallas Street
Henderson, CO 80640
Phone: 303-289-8555
Fax: 303-289-7707
11 PERMIT BOUNDARY
11
REVISED /
1
1
AFFECTED AREA , 11
BOUNDARY 1
11
-' li]1� 111
147118101003
SHIPMAN THEODORE R LIVING TRUST /
TRS EQUITIES LLC
CHAVERS MINING RESOURCE
REGULAR 112 PERMIT M-2015-030 AM -02
MAP LEGEND
EXISTING EDGE OF PAVEMENT
EXISTING ANADARKO PIPEUNES
EXISTING OIL & GAS WELL HEAD
EXISTING UTILITY POLE
EXISTING BURIED TELEPHONE LINE
EXISTING BURIED GAS LINE
EXISTING BARBED WIRE FENCE
EXISTING EDGE OF GRAVEL ROAD
EXISTING RIVER
EXISTING PROPERTY BOUNDARY
EXISTING ADJOINING PARCEL BOUNDARY
EXISTING SECTION LINE
EXISTING RIGHT OF WAY UNE
EXISTING MAJOR CONTOUR UNE 5FT
EXISTING MINOR CONTOUR LINE 1FT
EXISTING 100YR FLOODPLAIN BOUNDARY
(FEMA PANEL #0802660983C)
EXISTING RIP RAP SPUR DIKE/WEIR
STRUCTURES (COOT)
PERMIT BOUNDARY
AM -01 ADDITION TO MINE PERMIT AREA
ORIGINAL AFFECTED REVISED AFFECTED
AREA BOUNDARY IIIIIII AREA BOUNDARY
-
♦
- - -
-
----
-
— — —
= e>_ =
ertrillSl1IN
poestviztiipieh
— — I= .
I ma"IIII.
PERMANENT MAN—MADE STRUCTURES
WITHIN 200FT OF THE AFFECTED AREA
1
SH-85 (COOT)
WELD COUNTY ROAD 8 (WELD COUNTY)
UNDERGROUND HP GAS LINE (BUCKEYE NGL PIPELINES, LLC)
UNDERGROUND TELEPHONE LINE (OWEST)
WELD COUNTY ROAD 8 BRIDGE (WELD COUNTY)
RESIDENTIAL STRUCTURE (CITY OF AURORA)
UTILITY POLES (UNITED POWER)
(RSA •2018)
OIL CAE FLOW LINE
2
3
4
5
6
7
110
9
.k
(REMOVED IN 2018)
SALES LINO (REMOVED IN 2018)
PRODUCTION TANKS (REMOVED IN 2018)
(REMOVED IN 2018)
IY[LL 11 18A I (SR WATADA (P&A IN 2018)
WIRE FENCE (COOT)
CONCRETE BOX - LIVESTOCK CROSSING (COOT)
EROSION CONTROL STRUCTURE (COOT)
WATER LUPTON LAKES INLET OUTLET FACILITIES
I OIL a CAS
11 I OIL & OAS
I OIL & OAS
BARBED
6FT X 8FT
SPUR DIKE/WEIRS
DENVER
13
14
15
16
17
PROJECT INFORMATION SUMMARY
PERMIT AREA: 95.0 ACRES
MINING AREA : - 75 ACRES
REVISED AFFECTED AREA: -87 ACRES
0' Z4dx
300' 375• 450'
EXHIBIT C-1
+ EET
1 OF 1
-----------
G
N
\
I
j
♦
DENVER WATER \
LUPTON LAKES INLET
OUTLET FACILITIES
SITE ACCESS
L ,
AFFECTED AREA BOUNDARY
-
-
a_s i W
II •,, I
MIIIIIIII A
I
•
RMIT BOUNDARY
\
I �-
/
\•
\ `Ism
\
+/ 1 4/ z^ O_/
LAS //
4 //
/ /7 7' $0�
� ...-^
/ �y
T 7-06--- - / ' ■ ■ minim ATTI'nfl iflflI i iii:7�1 UWrW l'7
i�I - I I- I I IS P I S I SS
/ /Or / t
PROPERTY BOUNDARY/ / 4
4.0
.444444
/ .//_4•4441ilir
gill "
- — —
i
(-\�
I
r. -w
CONCRETE
PLANT
SE CORNER OF THE SW 1/4
SECTION 18. T1N, R66W
REVISIONS
DESCRIPTION
t..
EXISTING ALLUVIAL WELLI
C
Wash
Plant
,11
•
I
a✓._
Wash Pond
Asphalt Specialties Co., Inc.
10100 Dallas Street
Henderson, CO 80640
Phone: 303-289-8555
Fax: 303-289-7707
PREPARED FOR
•
--
I
•
i'1-
5- //
..•�tef
at. tt
SpU�� p�T
` ?Ly+
Rfvto.e?
rrrrentrarrrarronrravrrrrrn
♦
♦
•
r
RECYCLE
OPERATION
& BACKFILL I
STORAGE
AREA
•
•
-
•
S.
S.
•
I
I
„ en MW -3 50'
11
1DISC$-IARGE OUTFALL 003-A
•
Total Area of Current Excavation = 20 acres
Total Exposed Groundwater
In Pit = 10 acres
In Ponds = 3 acres
♦♦
♦.481 II pW-5
4'ltl,
•
•
•
•
•
•
•
•
maw
1
r
r r
r
ate
r ••R�r r r
•..
PROPERTY BOUNDARY
•
•
•
•
•
•
•
•
R•.
CHAVERS MINING RESOURCE
REGULAR 112 PERMIT M-2015-030 AM -02
FORT LUPTON, CO
ASPHALT SPECIALTIES CO., INC.
i
i
I
1
PERMIT MDR diA%tc`
♦_
I. AFFECTED AREA BOUNDARY
♦
•
♦ I
• S.
‘ 4MW-6
S
M
DRAWN BY
NAP LEGEND
EXISTING EDGE OF PAVEMENT
COS EXISTING
EXISTING
t EXISTING
— — — -'— EXISTING
—rEXISTING
EXISTING
ANADARKO PIPELINES
OIL le GAS WELL HEAD
UTILITY POLE
BURIED TELEPHONE LINE
BURIED GAS LINE
BARBED HARE FENCE
— EXISTING EDGE OF GRAVEL ROAD
EXISTING RIVER
- -t- -r 4- -4- EXISTING DRAINAGE DITCH
EXISTING PROPERTY BOUNDARY
EXISTING ADJOINING PARCEL BOUNDARY
EXISTING SECTION LINE
- — — — - EXISTING RIGHT OF WAY UNE
MiltrairSfir
EXISTING RIP RAP SPUR DIKE/WEIR
STRUCTURES (COOT)
- me — — - PERMIT BOUNDARY
EXTENT OF MINING
CELL BOUNDARY
I II I l l It11' AFFECTED AREA BOUNDARY
PROPOSED DIRECTION OF MINING
SERVICE ROADS (GRAVEL)
41 MONITOR WELL
EXTENT OF MINING AREA = -75 ACRES
AFFECTED AREA = -87 ACRES
PERMIT BOUNDARY = -95 ACRES
ED= CURRENT EXCAVATION EXTENT
I
•
STOCKPILES
= TOPSOIL STOCKPILES
= RECYCLE & BACKFILL MATERIAL
a
= MINING COMPLETE
.
Q = DISCHARGE OUTFALL
mom I I m m m = 400 FEET FROM RIVER LINE
DISCHARGE dUTFALL 001-A
-
0'
/
/
150' 300' 375' 450'
EXHIBIT C-2
MINE PLAN MAP
CHECKED BY.
DATE
1/13/2024
SCALE 1'• = 150'
SHEET
1 OF 1
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 3
6.4.4 EXHIBIT D - MINING PLAN
6.4.4 (A) DESCRIPTION OF THE METHOD(S) OF MINING
Mining conducted employs conventional aggregate mining techniques including the use of
excavators and loaders to excavate topsoil, overburden, and aggregate material. Mining is
accomplished by utilizing dewatering trenches around the perimeter of the toe of mining slope to
facilitate dry mining. Haul trucks move materials to be processed at a fixed gravel plant located
on -site. Finished materials are stockpiled where they are loaded into trucks for removal off -site or
to the concrete plant located in the southeastern corner of the site.
6.4.4 (B) EARTHMOVING
The mining operation strips topsoil and overburden to expose the underlying raw aggregate
material deposit. Topsoil is stockpiled on -site and seeded to establish a vegetated cover to
minimize erosion until future reclamation use. Overburden material will be utilized as part of the
mine backfill. Overburden material will typically be stockpiled temporarily (i.e., less than one [1]
year) and used as backfill of earlier mine excavation areas. However, should mining operations
call for overburden materials to be stored over one (1) year, the stockpiles will be seeded with
reclamation seed mix to establish a vegetated cover to minimize erosion until future backfill use.
The exposed raw aggregate material deposit will be excavated and processed.
The equipment used to conduct the earthmoving activities may include dozers, loaders, excavators,
articulated haul trucks, water trucks, and scrapers for the mining and earth moving operations.
Aggregate processing equipment includes feeders, a fixed plant gravel plant with crusher and
screens, sand screw, wash plant, conveyors, stackers, and other miscellaneous processing
equipment.
6.4.4 (C) WATER DIVERSIONS AND IMPOUNDMENTS
The following discusses water diversions and impoundments at the Site:
Mine Pit Dewatering: Mining of the Site utilizes dewatering trenches around the
perimeter of the toe of mining slope to facilitate dry mining. Water is directed into a
pump basin (i.e., sedimentation pond) within the pit to settle out fines prior to being
pumped for discharge (via enclosed pipe or dewatering trench) to the South Platte River
at approved Outfalls 001-A or 003-A.
Wash Plant: Wash plant water is recycled in a continuous loop using on -site
sedimentation ponds. Water for the wash plant is pumped from an on -site sedimentation
pond. The used wash plant water is directed to another on -site sedimentation pond to
allow suspended sediment to settle out. The settled wash plant water is then transferred
back to the initial sedimentation pond to be re -used by the wash plant. Settled fines from
used wash plant process water sedimentation pond will be excavated and used as backfill.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 4
Industrial Well: In addition to sand and gravel pit mining, a concrete production plant is
located at the Site. The concrete production plant utilizes groundwater from the on -site
industrial alluvial well (Well Permit No. 80120-F) located near the southeast corner of
the Site.
ASCI maintains replacement water lease(s) and approved Substitute Water Supply Plan (SWSP)
through the Division of Water Resources (DWR) annually to account for out -of -priority depletions
resulting from the water diversions and impoundments.
6.4.4 (D) SIZE OF AREA(S) TO BE WORKED ON AT ANY ONE TIME
The maximum size of pit areas to be worked on at any one-time is approximately 20 acres. The
average depth of the pit across the Site is approximately 28 — 32 feet below ground surface.
6.4.4 (E) APPROXIMATE TIMETABLE FOR MINING OPERATION
Approximately 75 of the 87 acres of affected area at the Chavers Mining Resource are mineable.
Of the 75 mineable acres, approximately 50 acres have been or is currently being mined. The
mining operation is estimated to last for another 6 to 8 years; however, this could vary depending
upon market conditions. Up to 20 acres may be exposed at one-time for concurrent mining and
backfilling operations. As shown on Exhibit C-2, current mining excavations within 400 feet of
the South Platte River will be backfilled to pre -mining elevation within one (1) year of approval
of AM -02. Future mining excavations within 400 feet of the South Platte River will be backfilled
to pre -mining elevations within one (1) year of excavation.
6.4.4 (F) STRATIGRAPHY
6.4.4 (F)(i) Nature of Deposit
The average overburden thickness is approximately 3.5 to 4.0 ft. The topsoil portion of the
overburden typically ranges from 12 to 24 -inches in depth. The sand and gravel deposit varies in
thickness, but the average thickness is approximately 28 feet. It varies from sandy lean clay in the
upper zones, to coarse clayey sand and sand with gravel nearer the bedrock. The gravel typically
found in this area has a history for being processed into high -quality aggregate construction
materials including concrete and asphalt.
6.4.4 (F)(ii) Nature of Stratum beneath Deposit
The strata underlying the sand and gravel deposit is a claystone bedrock.
6.4.4 (G) COMMODITIES MINED/EXTRACTED AND INTENDED USE
The primary commodity is sand and gravel to be used for the construction industry.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 5
6.4.4 (H) INCIDENTAL PRODUCTS MINED/EXTRACTED AND INTENDED USE
There are no incidental commodities.
6.4.4 (I) EXPLOSIVES
No explosives will be used for the mining operation.
6.4.4 (J) DIMENSIONS OF EXISTING OR PROPOSED ROADS
No existing or proposed roads are associated with the mining operation.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 6
6.4.5 EXHIBIT E — RECLAMATION PLAN
6.4.5 (1) PREPARATION OF THE RECLAMATION PLAN
This revised reclamation plan includes specific details related to final reclamation of the Site as
rangeland use after backfilling. Specific information contained in this document includes final
grading, seeding, fertilizing, revegetation, topsoiling, and weed control.
6.4.5 (2) RECLAMATION PLAN REQUIREMENTS
6.4.5 (2)(a) Description of Reclamation Plan
Reclamation of the Site will return the land to rangeland use after backfilling. The benefits of this
plan include:
Creating usable property for rangeland use.
Increasing the visual attractiveness of the Site and surrounding area.
Providing private entities an alternative for disposal of clean materials (e.g., basement
over -excavations for housing developments).
Increased employment opportunities created by the backfill operations and reclamation of
this Site.
Should ASCI decide to sell the property after reclamation is complete, this plan will
allow for long-term flexibility when evaluating future development options. This could
result in revenue to the City of Fort Lupton and the State in future taxes pending the
redevelopment plan by a new owner.
Of the 95 -acre permit area for the Chavers Mining Resource, approximately 75 of the acres are
mineable. ASCI is expanding the affected area ±75 acres to ±87 acres for surface use disturbances
only (no change to the ±75 acres to be mined). With this amendment (AM -02), reclamation of all
±75 acres will be backfilled and the entire ±87 acres will be reclaimed for rangeland use.
Backfill Material: Backfill material will consist of on -site overburden, on -site crusher
fines, wash plant fines, and imported clean, uncontaminated material consistent with the
Construction Material Rule No. 1, Section 1.1 (22). It is ASCI's intention to use
primarily native/natural earth and aggregate materials (e.g., sand, gravel, and rock) for
backfill material. It is especially important to ASCI that only clean, uncontaminated
materials are delivered to the Site. All backfill materials generated off -site will be
delivered by reputable pre -approved contractors that have a history of working with
ASCI and will adhere to the Site rules and guidelines. ASCI will collaborate with the
contractors to obtain assurances that backfill materials are free of contaminants and are
native or natural materials. ASCI will exercise every effort to learn as much as
reasonably possible about the backfill materials received at the Site to ensure that those
Charm Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 7
materials are free of contaminants. All backfill materials will be inspected upon entry to
the Site and while being unloaded using visual and/or olfactory methods to ensure no
potentially contaminated materials are received. If evidence of possible contamination is
observed, loads will be rejected and will not be allowed to be left on -site by the
contractor. No contaminated materials will be accepted or allowed on -site. Any
asphalt or concrete materials received will continue to be diverted to the recycled
aggregate materials operation at the Site.
Backfilling Process: After an area of the property has been mined of sand and gravel,
backfilling operations will begin once they can be safely conducted. ASCI will conduct
backfill operations concurrent with mining operations whenever possible. The exposed
pit area will constantly shift as concurrent mining and backfill operations occur, but
ASCI will not exceed an exposed active mining and backfill pit area of approximately 20
acres at any one-time. The time to complete backfill will vary upon market conditions,
but groundwater will continuously be pumped until backfill above static water level is
complete. Backfill material will be imported to the Site with articulated dump trucks
and/or highway dump trucks. The material will be placed and spread in one (1) to two
(2) -foot lifts using haul trucks, bulldozers, excavators, and/or loaders. Compaction will
take place during the filling process, as haul trucks and heavy equipment traverse over
the fill. Temporary excavation slopes and temporary stockpiled material slopes may
range from 1:1 to 3:1 depending on soil conditions in the mine. All slopes will be
maintained for site safety and to minimize material erosion. Areas will be backfilled to a
rough grade (i.e., within approximately 2 - 3 feet of final grade).
Grading and Topsoil: Once the backfill is near rough grade across the Site, the surface
contours of the affected area will be graded to approximately twelve (12) inches below
the final grade across the Site. After contour grading is complete, a minimum topsoil
cover twelve (12) inches thick will be placed on top of the backfill to reach topographic
elevations prior to mining (i.e., final grade). The final grade will control water runoff,
erosion, and siltation to protect all areas outside the mine and allow surface drainage to
flow gently as sheet flow to the northeast, consistent with pre -development drainage.
To ensure grading requirements are met, elevations will be checked periodically by ASCI
during the reclamation process. This will continue until the final grade is achieved with
backfill materials and topsoil cover. A final topography survey will be conducted by
ASCI after topsoil has been placed, but before seeding occurs to ensure that the Site
topography is at pre -mining elevations and sloped for positive drainage. All surveys will
be conducted by aerial drone. The allowable vertical variation will be approximately one
(1) foot given that the final topography will be slightly undulating in areas to mimic the
original landform. Once topography across the Site is within acceptable limits, ASCI will
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 8
proceed with the revegetation process. The approximate final contours of the Site are
shown on Exhibit F - Reclamation Plan Map.
■ Seeding and Growth Monitoring: The topsoil layer will be seeded with a native grass
seed mix to return the property to rangeland use. Growth of the grass will be monitored
quarterly until established to ensure a successful transition back to rangeland use.
6.4.5 (2)(b) Land Uses in the Vicinity
Reclamation to rangeland land is a positive and useful post -closure land use that is compatible
with surrounding uses which include multiple sand and gravel mines, oil and gas industry sites,
and other rangeland/agricultural lands.
6.4.5 (2)(c) Reclamation Performance Standards
The following sections describe how this reclamation plan meets applicable requirements of
Construction Materials Rule No. 3, Section 3.1 Reclamation Performance Standards.
RULE 3: Section 3.1 - Reclamation Performance Standards
3.1.1 Establish Post Mining Land Use: The post -mining land use shall return the property to
rangeland use. The Site is currently zoned Agricultural by the City of Fort Lupton.
3.1.2 Reclaiming Substituted Land: Not Applicable
3.1.3 Time Limited and Phased Reclamation: A phased reclamation approach will be
implemented. Reclamation will occur in two (2) phases:
Reclamation Phase 1: Backfill — Reclamation Phase 1 will backfill excavated
with on -site overburden, crusher fines, wash plant fines, and imported clean,
uncontaminated material. Backfill will occur concurrently with mining whenever
possible; however, backfill will continue after mining is complete. Reclamation
Phase 1 will be complete when backfill of the entire Site is within approximately 2
- 3 feet of final grade as indicated by ASCI survey. Should completion of
Reclamation Phase 1 not be feasible within five (5) years from the date ASCI
informs the DRMS that all material extraction and stockpile removal is complete,
an extension will be submitted based on the remaining backfill volume required at
that time.
Reclamation Phase 2: Grading, Topsoil, Seeding, and Growth Monitoring — In
Reclamation Phase 2, ASCI will remove existing structures, grade Site contours
for the ±87 acres of affected area to approximately twelve (12) inches below the
final grade, and place a minimum final cover topsoil layer twelve (12) inches thick
across the affected area. Changes to topography will be made as necessary until the
final grade is within acceptable limits and returned to pre -mining elevations. Once
final grade is achieved, site seeding, fertilizing, and mulching will occur in the
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 9
subsequent fall season. Growth and progress of the grass will be monitored
quarterly to ensure a successful transition back to rangeland use. It is anticipated
that a successful transition will occur within five (5) years from the date ASCI
informs the DRMS that Reclamation Phase 2 has commenced.
3.1.4 Public Use: The public will not be allowed on the land while mining and reclamation
activities are in progress. After reclamation is complete and the bond released, the public
will only have access to the land adjacent to the South Platte River that will be dedicated
to the City of Fort Lupton.
3.1.5 Reclamation Measures — Materials Handling: Measures will be taken to meet the
following requirements.
(1) The Site will be graded to the approximate topographic elevations prior to mining.
The approximate final contours of the Site are shown on Exhibit F - Reclamation Plan
Map.
(2) No toxic or acid-forming materials will be included in backfill material. All backfill
materials will be compacted during the filling process.
(3) Grading will be done to control erosion and siltation on the affected lands and protect
outside areas from slides. No high walls will be left exposed.
(4) Once backfill activities are complete at the Site, grading will occur as quickly as
feasible.
(5) No acid-forming or toxic producing materials are associated with materials mined at
the Site. On -site refuse is maintained by contracted vendors to control unsightliness and
protect the South Platte River drainage system.
(6) No drill or auger holes, adits, or shafts are associated with the mining operation. All
monitoring wells will be properly abandoned prior to completing reclamation.
(7) Contouring the site back to approximate pre-existing topographic elevations will
result in maximum slope(s) that are compatible with surrounding conditions and
selected land use.
(8) The grade of the land will allow for use of farm machinery to traverse the Site.
(9) This document, Amendment No. 2 (AM -02), serves as ASCI's notice of intent to
backfill using clean, uncontaminated materials generated outside of the approved permit
area in addition to materials generated within the permitted area.
(a) The location of backfill sourced off -site will occur in the remaining ±71 acres
to be mined.
(b) The approximate total volume of backfill material is estimated to be ± 3.0
million cubic yards.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 10
(c) A signed affidavit certifying that the material is clean and inert, as defined by
Rule 1.1(22) is provided as Attachment 1 of this document.
(d) Backfill of material generated off -site will commence in 2022/2023 and end at
the completion of Reclamation Phase 1 (estimated 2035 - see Section
6.4.5(2)(e)).
(e) The backfilled Site will result in a post -mining configuration that is
compatible with the post -mining land use (i.e., rangeland) being requested for
approval by this Amendment No. 2 (AM -02).
(f) The material will be placed and spread in 1 -to -2 -foot lifts using haul trucks,
bulldozers, excavators, and/or loaders. Compaction will take place during the
filling process, as haul trucks and heavy equipment traverse over the fill.
(10) All mined material not compatible for off -site use (e.g., fines) will be backfilled to
prevent any release of unauthorized fine material to the surface drainage system.
(11) No unauthorized release of pollutants to groundwater will occur from materials
mined, handled, or used as backfill within the permit area. No toxic or acid producing
materials are used in the mining process.
3.1.6 Water — General Requirements: ASCI will minimize disturbances to the prevailing
hydrologic balance and water quality of systems (surface and groundwater) both during
and after mining and reclamation phases.
(1) Hydrology and Water Quality: ASCI will continue to comply with applicable
Colorado water laws and regulations to ensure no injury occurs to existing water rights
and maintain water quality standards of the Water Quality Control Commission
(WQCC). ASCI will continue to maintain the appropriate permits and plans (e.g., CDPS
Discharge Permit, approved Substitute Water Supply Plans [SWSPs]) along with
replacement water lease(s) sufficient to cover out -of -priority depletions throughout the
mining and reclamation process. Additional details regarding hydrology & water quality
are provided in the Groundwater Monitoring and Mitigation Plan (Attachment 2).
(2) No earthen dams will need to be constructed.
(3) All surface areas, including spoil piles, will be stabilized to effectively control
erosion using appropriate erosion control measures.
3.1.7 Groundwater — Specific Requirements:
(1) The Site is located within Classified Area: City of Fort Lupton Wellfield, Weld
County (WQCC Regulation No. 42). Water quality standards applicable to the Site are
presented in the Groundwater Monitoring and Mitigation Plan (Attachment 2).
(2) Not Applicable - The Site is located within a classified area.
(3) Not Applicable - The Site is located within classified area.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 11
(4) Procedures for establishing compliance with standards promulgated by the WQCC
are presented in the Groundwater Monitoring and Mitigation Plan (Attachment 2).
(5) Details of the groundwater quality monitoring program for the Site are presented in
the Groundwater Monitoring and Mitigation Plan (Attachment 2).
(6) Monitoring wells MW -4, MW -5, and MW -6 will serve as the Point o Compliance
wells for the Site. Details of the groundwater quality monitoring program for the Site
are presented in the Groundwater Monitoring and Mitigation Plan (Attachment 2).
(7) Details of the groundwater quality monitoring program for the Site are presented in
the Groundwater Monitoring and Mitigation Plan (Attachment 2).
(8) By implementing the groundwater quality monitoring program for the Site presented
in the Groundwater Monitoring and Mitigation Plan (Attachment 2), ASCI will be able
to demonstrate existing and reasonably potential future uses of groundwater are
protected.
(9) As detailed in the Groundwater Monitoring and Mitigation Plan (Attachment 2),
ASCI will provide a written report within five (5) working days when there is evidence
of groundwater discharges exceeding applicable groundwater standards or permit
conditions imposed to protect groundwater quality.
3.1.8 Wildlife: No threatened or endangered species are present at the Site.
(1) Wildlife habitat types currently present include pastureland and the South Platte
River riparian corridor. The riparian corridor is outside the mining and backfill areas.
(2) Neither habitat creation nor habitat management is part of the reclamation. The land
will be returned to rangeland use.
3.1.9 Topsoiling 116(4)(g):
(1) Topsoil is maintained on the Site in locations segregated from other spoil piles. All
current and future topsoil stockpiles will maintain a vegetative cover to prevent erosion.
(2) No woody vegetation is present within affected areas.
(3) Topsoil stockpiles are in locations and configurations to minimize erosion and
disturbance.
(4) If necessary, relocation of topsoil stockpiles will be submitted for approval by way
of technical revision.
(5) Topsoil will be replaced and graded to mimic pre -mining elevations. No graded
slopes with the potential for slippage zones are planned.
(6) ASCI is following MLRB and DRMS requirements regarding topsoil suitability at
the Site.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 12
(7) Reclamation of the Site to rangeland will utilize fertilizers and/or soils amendments,
as needed.
(8) Vegetative piles will be removed from the Site as part of final reclamation.
3.1.10 Revegetation 116(4)(0:
(1) All areas will be revegetated for long-lasting coverage that is capable of self -
regeneration using native grasses and forbs. Additional details are provided in Section
6.4.5 (2)(d) Revegetation Plan.
(2) Reclamation will not include forest planting.
(3) Land will be restored to slopes commensurate for rangeland use and capable for
livestock to traverse.
(4) Revegetation will consist of native grasses and forbs to provide for the greatest
probability of success. Grazing will not occur until revegetation has been established.
(5) ASCI will employ appropriate techniques of site preparation to ensure a diverse and
long-lasting vegetative cover (e.g., discing, crimping, ripping, mowing, mulching, soil
amendments, cover crops, and/or fertilizers).
(6) ASCI will monitor progress of revegetation and implement weed control practices
as appropriate for any areas infested by noxious weed species.
(7) As necessary, temporary dirt access roads and/or fire lanes will be constructed
through areas to be planted for planting crews, supervision, and inspection.
(8) ASCI will implement final reclamation planting after all other uses of the property
are complete.
(9) If adverse characteristics of the surface, not feasibly remedied by artificial
measures, would seriously inhibit plant growth, planting may be delayed depending
upon natural corrective processes over a ten-year period.
3.1.11 Buildings and Structures 116(4)(r): No building or structures are anticipated to be left
on -site or constructed as part of the reclamation plan.
3.1.12 Signs and Markers:
(1) Throughout the reclamation process, ASCI will maintain a sign at the entrance to
the facility and clearly visible from the road with the following information: 1) Name
of Operator; 2) Statement that a reclamation permit has been issued by the MLRB; and
3) Permit Number.
(2) Throughout the reclamation process, ASCI will maintain monuments/markers
clearly identifying the affected area boundaries
(3) No alternative plan for identifying affected area boundaries is anticipated.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 13
3.1.13 Spill Reporting: ASCI will notify DRMS of any toxic or hazardous substance spills,
including spills of petroleum products, within the permit area that would also be
required to be reported to Colorado Department of Public Health and Environment
(CDPHE) or other federal, state, and/or local government agency.
(1) ASCI will notify DRMS within 24 -hours from when any spill is reported to other
agency(ies) with authority over the spill.
(2) ASCI will include any relevant information known at the time to assist DRMS in
assessing the seriousness of spill impacts.
5.4.5 (2)(d) Revegetation Plan
The method of revegetation seeding will be by drill seeding. The recommended species
composition for the reclamation seed mixture is presented below.
Species
(Variety)
Rate
(pis/acre)
Native or
Introduced
Warm or Cool
Season Grass
Thickspike wheatgrass (Critana)
8.0 to 10.0
Native
Cool
Sideoats grama (Vaughn)
5.0 to 7.0
Native
Warm
Switchgrass (Nebraska -28)
4.0 to 6.0
Native
Warm
Alfalfa (Nomad)
3.0 to 5.0
Introduced
N/A
Total
20.0 to 28.0
Both
Both
Notes:
pis = Pure Live Seed
Based on this seed mixture, an application rate of approximately 20.0 to 28.0 pls/ac will be used.
Due to the common use of these grass species in the area, the availability of viable seeds in
sufficient quantities is not considered to be an issue. Soil will be disced prior to seeding. Fertilizer
be utilized in conjunction with seeding. A standard application of fertilizer will be used and applied
at an appropriate rate (e.g., 250 lbs./acre). The total area to be seeded and fertilized is
approximately 75 acres. Seeding and fertilizing will be completed as soon as possible after the
overburden soil is backfilled, smoothed to conform to the reclamation topography, and the final
layer of topsoil is placed and disced. Optimal periods of seeding are in the fall, before the first
freeze (before November 1st) or in the spring from late -March up to April 30th. A standard
application of straw mulch will be used and applied at an appropriate rate (e.g., 2 tons/acre) to the
approximately 75 acres.
Following revegetation, weed management strategies will be implemented to facilitate and achieve
native grassland. Quarterly inspections to monitor revegetation progress and identify weed
infestations will be conducted until the reclamation bond is released. ASCI will implement
Charm Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 14
cultural, mechanical, and biological control methods including an aggressive mowing program to
prevent the growth and establishment of weeds as mandated by Colorado State Law (C.R.S. Title
35 Article 5.5 Colorado Noxious Weed Act). If needed, chemical/herbicide application will be
applied to further control weed infestations.
6.4.5 (2)(e) Schedule for Implementation
Reclamation backfill will occur concurrently with mining wherever possible to backfill material
into previously mined areas. Temporary stockpiling of backfill materials may occur for short
durations. Reclamation Phase 1: Backfill will be completed as soon as possible after mining is
complete, but no later than 5 -years from notifying DRMS that mining is complete. Reclamation
Phase 2: Grading, Topsoil, Seeding, and Growth Monitoring will be completed as soon as possible
after backfilling is complete, but no later than 5 -years from notifying DRMS that backfill is
complete.
6.4.5 (2)(f) Description of Reclamation Details
(i) Final Grading — Reclamation of affected lands at the Site will be graded to the
approximate topographic elevations prior to mining. The slope gradient is anticipated to
range from 0.1% (minimum) to 1% (maximum). The approximate final contours of the
site are shown on Exhibit F - Reclamation Plan Map (Figure 6).
(ii) Seeding — Information regarding seeding (e.g., types, mixtures, quantities, and expected
times for seeding) is presented in Section 6.4.5 (2)(d) Revegetation Plan.
(iii) Fertilization — Information regarding fertilization (e.g., type, mixtures, quantities, and
time of application) is presented in Section 6.4.5 (2)(d) Revegetation Plan.
(iv) Revegetation — Information regarding revegetation (e.g., type of grasses, location, etc.)
is presented in Section 6.4.5 (2)(d) Revegetation Plan.
(v) Topsoil — A minimum of twelve (12) inches of topsoil will be placed across the affected
area and re -seeded as part of the Site reclamation.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 15
6.4.6 EXHIBIT F — RECLAMATION PLAN MAP
The following Exhibit F - Reclamation Plan Map has been revised to show:
(a) The expected physical appearance of the area of the affected lands after reclamation is complete
including topographic contour lines after final grading to return the affected lands to pre -mining
elevations.
(b) Portrayal of the final land use as rangeland.
777 tZ.
----
1
1
/
.
�`\•••X
\,®�tl
•
(\
J
4 Eh
J
•
t 5
\
1 \I
r
0'
II
'fir-ift.% \/
`• L- A h�
\ el
/
-_--_t r.
/rI
-.
•
Cl
(1
1
•-)/\ 1
AVER WATT-R-L�UI'TOJet I := 0•`'��
LAKES INLE` A rOU`fLET � � `��
FACJWITiES a ��¢ ������
t7
I
•
r,
•I
•
•
1 1_ `r
1/- 'p
/ i\
I I
\i
L /
•'•"••••......1. 1\
- `
I
' I,- ,J
f—'5 Ii1 1
1 iU
l�t�-r1o/f `\ I I
A. aGt. _. / /1 X.
4
\�\ lik...I 1 I,.�1J
I'\\/11\ \\11
:_ ♦ .
^�"� \V1 \
\ \
ZS 7-^1 \
/ 1 n \\ \\
t/i1.1 1 \Y/
--
..-
r
fi
1
I\
al\
/ I
r \
\ \
5
1\ 1
< \
1 \ \ is
\ )
1 t\ 9
1
I I j /_�/
-•'
L\
Cat 1 ••
•„f.
-�• ------"--..-
••••• ♦` %r\\ \\ V `t•J // 1 \ •1 Jr 1 \\ l..:( 1111,
ttt
/
VI
\t� /'( + �' -N.,_..........:
•
•
```Ji \ // l\ J ...el'',
/ \I tJ"°1 /'�1i �'�/� /��?�?= �� r �\ ,/ ����/ /
:....:::+iii/�\-I \� \.= 51\♦\\L\��; `'t ti
7 XI
le
N.
/ �\ /t/vit.�z�f i + �-/- ��,�rilo . I f\/-� r_� `•IC\to Ile
•
•
A.
t •tWF \1jtlwer�`1'q'^'"r _. -r4j�// /.t.�QQ�\\•)\
��/It\�'�=`=�..�,�; �.�-�� i`-_���I ` .._�`- .--»� ° C11`\\--- \ �\�`\ r 'I
—
•
•
•
/
�.� < !1 ( 1 / / �i° r' JJ F / 7 Q.1 9 r tom. ` C`\/ ^._` ....\ ♦ \ J`L��.� ::„.�.\ `_ \,
/ &PO'I I ( 1a. /� //' ! +`) f? i / / �{•E / ll 'r-
"__�_2 `'\ v�t>��`\`\•�_�_��J `�C��\v/ /\iceC) \_��__ \ 1
I `\ III+//�' �/ / r%�/ // - I_.. `1 - �' �� r�i `�`\.. AL `\�\`f\` -,:-...--11/�, ..".� r\ �'\\. \ ^/ / . \tom I / '
/J. / v• \. _. �.s. \ el/ _ . _-_-- --- \/�a PROPERTY . /� %r,�r, / _ - \ ` R D 1 - _ <� �
/ri
/r BOUNDARY 1/f %/� / $
i ) y _ - \ I `\ r1 °! O \\ < • '`
t
rte•' ,• J /' // I�-�// 1 - - \' ���.� �* r \_/'-" a `\ \' c\ .� I"• ��l J
1!
+l
_ / /
• w
1tyv,WJ11I,1Yr•'
I W W
.1
I
y
4'
w
w
w
• w 1 w
�w w wi
4, 4, I w
4 W w 44
wl TRAIL DEDICATION
w
TO CITY OF FORK L
LUPTON'
w w w
w * POTENTIAL FUTURE
v w OIL & GAS WELL 4:
w
w 4' W w w0'
W W W * W - yi�t
— 'V — — — — —
W --w -� I I
` 1 C
w
w
w
w 4 *
I
y w I , w
* 4• 4' w w /£ I w *
W W 4' w w 4 I • 4' *
w w w W Ls, I w W
w w w w ` I W w
* w w 4' 4. I I - w 4,
1 1`
'w W 4' w '4' '4 •r4W • ..If . , +•4
'�.bA
w * W w 4.• W�
,: ..,,y a me 'a' �.�' W —
\ —__ _\ -ma=r --^- - _-' __
— _ — — — -STATE gj�H1IAY 85 _ ' . _ - - -_
4.
w
t
aft
.• •, ,I... •. .I ...L .'.•.r ..11u.•u,l ... ..JLu .u1La.lua! .. _ . u / ��� =-..--e--.....‘
T �� ` ` . ....
, r\-:-.---'
'"
�. _
X 7-
L 4. w w w w" t\y y _.Y' W ,Y w w w y W w W c.../ /,h?v'\ `` �� _:)••<-J �1 ° Ji °�«�_
w w w w w '•r \• NI/
w W * w w w W w * w * W� •/�I/ , %� \` t\ J 4 v.
1 ' 1 t`_`��i`_� `.\ t_r --//
•
w W w W w * ` � w w w W w 4.•
w W w w w 4r ` w ,/.�� `� r PROPERTY _ **ft ''s \_ _
�'•.;�� ` �� BOUNDARY PERMIT �.
w w w w w w w % -re. 1‘ w w w W * w * w W w W W w �i! ♦�.�
w,•'w w w w W w W w W \` W w * w W w 'P W w W w *
W W // 1411 ` — 1—^ -� hor:L---
/ es' Iws•
/ w w w w w * w W .\ W w w W w W w * w * * w w w� 1111 `Q Oft ° `_—
VV 1111/ ^ _ • f�
W * w w W W W w w W W W w w W W W W W w * Jo'
W W . 1111 mom aft as - 7: w 4 w * W w w w w ;\\, J••
4' * w W w w w W W w 4' w w W • •3/4,,,,,,,.` ////Q//// '� a1`� `/`_~\/�lr ......i_
-- )- `\ N.
A.
w w W * w w W * * w• • w w w w * w W * w w w y w W wl w w 1111 % a te \• _ r C \
11/I \ —.
' 0.0%.*
/1 II/IIIIf/111/ N/11 r' - / / `
w w W W w W W W w y � � W w * w w w w w w w w +b w * w I w w w * �•.�
w w W W v w W W w w w `_ w w w W w -4,
w W * w w w w W w W W 4� •� • .Ir.• \ •-1 _
W W * W * Slope = 0.001 ft/ft -- �t •, :_l \ ` a `� ^� �,
c.
` w w 4') w W W w w w w w w y W w W w v w w I W * `_.\ - '`. \ •._
w 4 w W w w w * w w 'Y `\\ ffL W 4 w w w w * w w W W w w w w w w Wl w .L w � g��i, •\ \ ' \\!\\• •
y\ 1 \I `�
LIPTON w w W W * W w w w w w \Y\ w *
w * w W w W * W. w W w W W w W 4. w I W 4. w a•
\�/i f� `f I
ro I •., i \ `. `. 1\
* W w W W W W w W w w W w , �\� w w w W w W w w 4' �J'' w w w 4' w w * w w 4'1 w w w v /�j 1111 \\ `� \` f\ \.
w W W 4' 40*
W W w W W w w ��\ ,,, POTENTIAL FUTURE 4, w w '4' IS
r+ w 4• v- w w w w w I w W w r- �•���, ' i - `. �\ \\) '�+
OIL&GAS WELL .4°•` 1 \
W w w * w W 4 W w W w w w w w •; W 4-
*POTENTIAL
w w * W W W * w w w w w w va W w w w '; � �� ; ` \� `\J \\\ ``.
* w w * w W w * W w \ \` w w w w w w w 41
L w w w I w w y .1.
W Tv \\ \ ! ^ \
RangelandRangeland \�
W W w w w W W W ..i.4/
w w W \'� ` w W W w w W w W w 4'
w w w w 4'
Use _"i�_�k�,, o
reillt
w w w w w W w w W w * w W 154>
\ \ W w W w W W Y Use w W w W w w y w 4 4� Wing"
1 f/ t,�`
E �`/,• fl l
W * W W w * * w w w W w w w v `�+ '' X11" ' �''w ,• ya ' W W H' W w w w w W w w WI * W L` �c°��h�,, `} \ �t
-• - T' -� 1'— - • I w w 4' w w W W .1/
1 o r ` ..4„„,„2„..-
4, w 40*
4' w V• w 4' w 4' * W l w 4' I /I 1 I
1 r •I / * w w w w w w W w W •1-i W 4• t\ 1 ,•
w w w w I W w * w w W W w W I / /'1
i _ _\ 1
W W w 1 w W w w W w w w w _••.�"+ / �+ 4' 4, W W w W w w W w W W w w I W w w 4-
* w w'i 1 I I !,a'
w w 4°
w !* w * w W w w w w w I IIl
•4, W •
w w w w W W W w 4.•
w w w w W W w W w W w j�Y\ 11 11
1 s
w W w W W W W w W w W w w \\ ( w W w W w W W W w Iw 4,
w 4..
W W W 4' W W w so 1 '��•-_l
11I
1
w 4DRAINAGE FL-61W
PATH w W w W w w W W I{ earl
w w W w w w w * W w W I w W r w W w 44914 * vi\� ,,��15
W W W I W w w W w w w * I w W W w * w W * W W w *
w W * W I W * W W w /
w W * I W W w w w w W w w I � v w w W Jo. W + w w w * W W W w 41 w w w 4, w W \ ,��/ �\ ^\
4• w w I w 4' w W * W W w I` ji w * W W w v. W 4 DRAINAGE FLOW PATH -- 4. w w -40
w * w w ivy\\�
`w w w W w 14 w W w w * w 4' w w i 4,41
41*
* W w w * w w * w w w W W 41 4°
w W w W W
W-24' — 'ti. � ty� •„_ems. ,y w w w w 1 w W *44
W *Y w W w +L w w I4' W W 4' W W W w w w * 4• 1' 1
w 4'
w
W
W
W
W
♦
/
w
SE CORNER OF THE SW 1/4
SECTION 18. TIN' R86W
—
/
/
/
/
///n////r/:___�=__
1 1/117/41/02:0:c J J,//////////,iii---___---__-
1 111/1/111,///7//1,,-/---
TIN//I/I /J////Jr
IIIIIII(/////////
IIIIII1II I11111rr ,
11{IINIIlflllll! //,
i lillllllllllll l II II—
IIIIIIIIII IIIIIII fill melt.
11111I11i11i11111 1111111
1ilil%I1,ta 111111 111111 1
IllililIlijIlItIl 1111111
IIIIIII1,ll{,1111 1111:111
1111
IIIIil1111.111I i l,,,
IIIIIIIIII'
REVISIONS
4••
1
w
w
w
W
w
W w
w w
41 w
w W
w w
w W W W
w 4• w 4.
4' w w
w v w v
1 !.
w W 4• w W w w w w W w W W w W w W W W I\
y
1t 3 .•••4 W .I' w w w w w I W 4• w w w W ;let `Y 51
* ' . ' • 1 •••• 1
W �V �. ' Vim. y� w W wII
I.
•
Li/ _•/ .I 1,-- /
, VI
..-
// .1 `J /
rte_, �/,/
JJ
/ /
//
I �/ I \\ / / I/ i 4- / I
♦ I / 11 \ ` •\\\ /! 1 1111 /:r�1' 1._
• :;)1 t,V. \ \`+//Tiff �� t .!
• �V
5
C1 ,�. \ afle"'� .�� •� w>. !•i -1 ice►. tJ9i►.�i.•/ /
-�__���► a ,��s.. y��I;��It,,CUy�° Ioi p�trfr
l( /if
MAP LEGEND
EXISTING EDGE OF PAVEMENT
tl °a EXISTING KERR MCGEE PIPEUNES
- EXISTING OIL & GAS WELL HEAD
♦- EXISTING UTILITY POLE
-•-•-•-•- EXISTING BURIED TELEPHONE UNE
---W--- EXISTING BURIED GAS LINE
EXISTING BARBED WIRE FENCE
EXISTING EDGE OF GRAVEL ROAD
EXISTING RIVER
EXISTING RIP RAP SPUR DIKE/WEIR
STRUCTURES (CDOT)
EXISTING PROPERTY BOUNDARY
- EXISTING ADJOINING PARCEL BOUNDARY
EXISTING SECTION UNE
- EXISTING RIGHT OF WAY UNE
- EXISTING MAJOR CONTOUR UNE 10FT
EXISTING MINOR CONTOUR UNE 2FT
MONITOR WELLS
LUPTON LAKES INLET AND OUTLET
FACILITY STRUCTURE (DENVER WATER)
In PROPOSED PERMIT BOUNDARY
PROPOSED MINING LIMIT
_ " - leBOUNDARY
PROPOSED MAJOR CONTOUR - 10FT
PROPOSED MINOR CONTOUR - 2FT
w W
PROPOSED TRAIL DEDICATION
TO CITY OF FORT LUPTON
AFFECTED AREA BOUNDARY
PROPOSED TOPSgi REPLACEMENT
RE -VEGETATION AREA (-74 ACRES)
RECLAMATION NOTES
1. BACKFILL OIL & GAS OPERATION CONCURRENTLY WITH MINING
OPERATIONS.
2. REPLACE TOPSOIL TO APPROXIMATE DEPTH OF 6 INCHES.
1 T I
• 1/
II 1
/ II
! --
I1- I
1 r 1
I j tl i '\ 3. RE -SEED SOIL REPLACEMENT AREAS WITH MIX INDICATED IN
r t •• • i`/ \\ \ r\ EXHIBITS.
! 1 4. IMPLEMENT WEED CONTROL AS INDICATED IN EXHIBIT E.
•
\� l
--- - PROPOSED CULVERT
•
1\` 1111/7/ \�_-_--____. \ ys�_--_'-__�___________-_---
•
1111 li 'Y•\• _ ___ - _ --- `-
/
�\ ;` I„\/j/p \� - \ \, /i%/�S`i- �.ae;=;_i=':t1�=au -.r• -`-c-� _ fin=111 `^
•
{�`\ 0.04 5/ /) . I// •$! _._T-II�risoim ig +•'s sue` ...r-' - -- 7:77. __- -_
/ I
1 it I ` \\ VI �k�! .., i` Ai o •.=--t+ t i / J J�— ♦ �~�__
/ 1 to
1 1 I! ` / • . LY/ f `mss J /„ \ -
/ I F 1 A^� 11 \ �I///r I _ `\ ' 'r h l� t l Ir _ / \ r Fs_- _= _s_iy, .1/4.
!/ % /J \
J / \ I / 1 /i/i���-=�c`�� 1' J 1 I 1t \\\\\\\\\f\ //111
•
/ 1 . r t / J / /
J I / I / ` /�_� k 1 // /%iii=Cti�� 1 Ill \ 1 I I / 11 ! If \
----->.�- ic-,r 1- �..�..�-J ft
11/11"• co* J J 1 / I 1 /r\' \)\ %1^'1% 1i1 1 \\
JJ 1 11 •I I 6141 J r / J I 51 I !!!
' l o / r r
- -___ I Ill dl 1 I'>♦ I r I ///
1 I : //4i Jl 111 J
- - i���-•�2 _ 1(11:01 \ I// 1 5 I lC Jj//JJ / I
/��,ii�` _`.` Ii\ II1/�/\�`I� I�\'11;/�,^JJ�//\\.
J 1 \•\ J I ! I l 1 1 . /r \
- •\ ) ^I ♦•\ J 1 / t I 1 \ 1 1//�.i 1
•
•
ir_ 444. 44.4
'gm...,
y — �'r"/\\\I 1 /\ -\\
ks /
•
_------i,�`I / •
\ 1 •
\
•
_ \•
.44 *44
•
•
_ � •
��t tl� `i \ lL5_♦ ~-�•�_ \•'• t\ 1 \ /S�'• /I% j"I
' ~ - \ \ \�\111 \1 1 l ' .44•:‘
'�► \ \ \ rya ( \ 1 \ / // /W // , 1 \
+- -\\\ 1,111\111171 1 t ♦ . \t•
\ \ /y//�///!/ r 111 0' I • /i)\\
\ 111 Nt 1 I.44
•••• ♦ �� /\ \\ \ \ a \ /� ///I i / ! • ( t `91 ti> '
11111j1111 ` \ / —``� ���'\ `1 � I \\\ \\ \ I •,�"it. "s°°/..0 I
\\111'1 ,111 IIIIIII'll,lll`\\`\ \ \ \ \ \ t�� , J /Jq•` /'�
ling% I' I �I. III\\ ._ .\ 1 I ��\1 ) •/.ti. 1z/./
REV
DESCRIPTION
DATE
APPROVED
ASPHALT SPECIALTIES CO., INC.
10100 DALLAS STREET
HENDRSON, CO 80640
Phone: 303-289-8555
Fax: 303-289-7707
/
CHAVERS MINING RESOURCE
112 CONSTRUCTION MATERIALS PERMIT AMENDMENT
FORT LUPTON, CO
l
\
C.
7z
150' 375' 450'
SCALE' 1'1.F 150'
EXHIBIT F
RECLAMATION PLAN MAP
SCALE
V=150'
REV
PREPARED POR
ASPHALT SPECIALTIES CO., INC.
BY
GRG
1/14/2024
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 16
6.4.7 EXHIBIT G - WATER INFORMATION
6.4.7(1) IF OPERATION IS NOT EXPECTED TO DIRECTLY AFFECT SURFACE OR
GROUNDWATER
Not applicable.
6.4.7(2) IF OPERATION IS EXPECTED TO DIRECTLY AFFECT SURFACE OR
GROUNDWATER
6.4.7(2)(a) Surface Water and Groundwater Systems Affected by Operation
With this Amendment (AM -02), no change will occur to the surface water and groundwater
systems directly affected previously identified. Operations at the Chavers Mining Resource affect
both surface water associated with the South Platte River located to the west of the mine and
groundwater associated with the South Platte River alluvial aquifer (i.e., uppermost aquifer).
Details of the groundwater quantity and quality monitoring program for the Site are presented in
the Groundwater Monitoring and Mitigation Plan (Attachment 2).
6.4.7(2)(b) Known Aquifers
South Platte River alluvial aquifer (unnamed aquifer).
6.4.7(2)(c) Dewatering Operations and Runoff
Mine process water, which includes groundwater from the dewatering operations and stormwater
that collects in the mine pit, is directed into a settling basin within the pit to allow fine sediments
to settle out before being pumped for discharge to the South Platte River. ASCI will maintain a
topography at the Site to direct stormwater runoff from disturbed areas, piled material, and
operating surfaces that is not collected in the mine pit to areas within the permit boundary where
the water can percolate into the ground.
6.4.7(3) PROJECT WATER REQUIREMENTS
ASCI submits SWSPs annually to the Colorado Division of Water Resources (DWR) for approval
to refine the estimated project water requirements each year based upon the anticipated site
conditions as mining and/or reclamation progresses. The current SWSP is approved through July
31, 2024. Estimated project water requirements were 83.87 acre-feet over the 12 -month period
covered by the plan (August 2023 to July 2024).
6.4.7(4) REPLACEMENT WATER SOURCES
ASCI utilizes a long-standing relationship with the City of Aurora to supply the project water
requirements. Currently, ASCI holds a water lease with the City of Aurora to supply replacement
water for the Site from 2022 through 2026. ASCI will continue to utilize this relationship
throughout mining and reclamation of the mine.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 17
6.4.7(5) NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES)
PERMIT
ASCI has acquired a National Pollutant Discharge Elimination System (NPDES) permit from the
Colorado Department of Public Health and Environment (CDPHE) — Water Quality Control
Division (WQCD). The Certification Number for the Chavers Mining Resource is COG501603.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 18
6.4.12 EXHIBIT L - RECLAMATION COSTS
6.4.12(1) COST ESTIMATE
ASCI generates clean backfill for the mine as part of the recycling operations conducted on -site.
However, should ASCI be unable to complete reclamation and the responsibility to fall to the
DRMS, the most cost-effective means to eliminate exposed groundwater and return the Site to
rangeland would be to install clay liners around the pit and wash pond walls prior to grading,
topsoil replacement, and revegetation. The following table includes the costs of reclamation that
would be incurred by the state as broken down into the various major phases of reclamation.
Reclamation costs conservatively assumed all internal slopes would be 1:1.
6.4.12(2) ADDITIONAL DATA TO SUBSTANTIATE COST ESTIMATE
ASCI will provide additional, reasonable data to substantiate the estimate of the cost of reclamation
for all Affected Lands, if requested.
Chavers Mining Resource
DRMS Permit No. M-2015-030
Exhibit L - Reclamation Costs
DIRECT COSTS
Item
Task Description
1 Dewatering Operation
2 Rip Weathered Claystone, Moisture Condition, Place Compacted Clay Liner Material
3 Back Slope adjacent to Clay Liner
4 Clay Liner Geotechnical Testing QA/QC
5 Finish Grade
6 Topsoil Replacement 87 acres @ 1' Depth
7 Revegetate Disturbed Area
8 Mobilization/Demobilization
Hours Volume Area Cost Extension
[hrs] [yd 3 ] (acres] ($/] ($]
1,440 $22.80 $32,832.00
219,558 $2.12 $465,462.23
219,558 $1.41 $309,576.30
219,558 $0.14 $30,738.07
87 $108.43 $9,433.84
192,995 $1.17 $225,804.15
87 $953.66 $82,968.41
$3,057.68 $3,057.68
9 Total Direct Costs
INDIRECT COSTS
OVERHEAD AND PROFIT
1 Liability Insurance (2.02% of Direct Costs)
2 Performance Bond (1.05% of Direct Costs)
3 Job Superintendent Costs
4 Profit @10% of Direct Costs
$1,159,872.69
$23,429.43
$12,178.66
294.0 $24,531.31
$115,987.27
Total Overhead and Profit
Contract Amount (Direct Costs plus Overhead and Profit)
1 Engineering work and/or contract/bid preparation @3.27% of contract
2 Reclamation management and/or administration @5.00% of contract
3 Conitgncy @ 3.00%
$176,126.67
$1,335,999.36
$43,687.18
$66,799.97
$34,796.18
$321,410.00
TOTAL BOND AMOUNT = $1,657,409.36
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 19
6.4.13 EXHIBIT M - OTHER PERMITS AND LICENSES
The following table provides an updated list of permits and approvals ASCI holds to conduct
mining and reclamation operations.
it/
DRMS Permit
M-2015-030
CDPS Discharge Permit
COG501603
APCD Mine Permit
16WE0619F
APCD Recycling Center
17WE0810F
DWR Gravel Pit Well Permit
80121-F
DWR Industrial Well Permit
80120-F
DWR SWSP
Plan Year 2023 - 2024 (approved August 29, 2023)
Fort Lupton Special Use Permit
Resolution No. 2019R043
Fort Lupton Annexation
Ordinance Nos. 2015-993 & 2019-1051
Fort Lupton Zoning
Ordinance No. 2019-1052
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 20
6.4.17 EXHIBIT Q - PROOF OF MAILING NOTICES TO BOARD OF
COUNTY COMMISSIONERS AND CONSERVATION DISTRICT
The following documentation is proof that notice of the permit amendment application was sent
to the Board of County Commissioners and to the Board of Supervisors of the local Conservation
District, pursuant to Rule 1.6.2(1)(a)(ii).
NOTICE OF FILING AMENDMENT APPLICATION
FOR COLORADO MINED LAND RECLAMATION PERMIT FOR A
REGULAR (112) CONSTRUCTION MATERIALS EXTRACTION OPERATION
NOTICE TO THE BOARD OF COUNTY COMMISSIONERS
Weld COUNTY
Asphalt Specialties Co., Inc. (the "Applicant/Operator") has applied for an amendment to the Regular
(112) reclamation permit from the Colorado Mined Land Reclamation Board (the "Board") to conduct
the extraction of construction materials operations in Weld County. The attached information is being
provided to notify you of the location and nature of the proposed amendment. All changes to the
existing permit are on file with the Division of Reclamation, Mining, and Safety (the "Division") and
the local county clerk and recorder.
The applicant/operator proposes to reclaim the affected land to rangeland use. Pursuant to Section
34-32.5-116(4)(m), C.R.S., the Board may confer with the local Board of County Commissioners before
approving ofthepost-mining land use. Accordingly, the Board would appreciate your comments on
the proposed operation. Please note that, in order to preserve your right to a hearing before the Board
on this application, you must submit written comments on the application within twenty (20) days of
the date of last publication of notice pursuant to Section 34-32.5-112(10), C.R.S.
If you would like to discuss the proposed post -mining land use, or any other issue regarding this
amendment application, please contact the Division of Reclamation, Mining, and Safety, 1313
Sherman Street, Room 215, Denver, Colorado 80203, (303) 866-3567.
I, (Printed Name) received the above notification and the associated
application on behalf of the Weld County Board of Commissioners on , 2024.
, 2024
Signature
RECEIVED
JAN 17 2024
WELD COUNTY
COMMISSIONERS
NOTICE OF FILING AMENDMENT APPLICATION
FOR COLORADO MINED LAND RECLAMATION PERMIT FOR A
REGULAR (112) CONSTRUCTION MATERIALS EXTRACTION OPERATION
NOTICE TO THE BOARD OF SUPERVISORS
OF THE LOCAL CONSERVATION DISTRICT
PLATTE VALLEY CONERVATION DISTRICT
Asphalt Specialties Co., Inc. (the "Applicant/Operator") has applied for an amendment to the Regular
(112) reclamation permit from the Colorado Mined Land Reclamation Board (the "Board") to conduct
the extraction of construction materials operations in Weld County. The attached information is being
provided to notify you of the location and nature of the proposed amendment. All changes to the
existing permit are on file with the Division of Reclamation, Mining, and Safety (the "Division") and
the local county clerk and recorder.
The applicant/operator proposes to reclaim the affected land to rangeland use. Pursuant to Section
34-32.5-116(4)(m), C.R.S., the Board may confer with the local Conservation District before approving
of the post -mining land use. Accordingly, the Board would appreciate your comments on the proposed
operation. Please note that, in order to preserve your right to a hearing before the Board on this
application, you must submit written comments on the application within twenty (20) days of the date
of last publication of notice pursuant to Section 34-32.5-112(10), C.R.S.
If you would like to discuss the proposed post -mining land use, or any other issue regarding this
amendment application, please contact the Division of Reclamation, Mining, and Safety, 1313 Sherman
Street, Room 215, Denver, Colorado 80203, (303) 866-3567.
I, -far t,, T j, I.e. (Printed Name) received the above notification and the associated
application on behalf of the Board of Supervisors of the Platte Valley Conservation District on
/ 16 , 2024.
Signature
I //6
, 2024
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 21
6.4.18 EXHIBIT R — PROOF OF FILING WITH COUNTY CLERK &
RECORDER
The following affidavit/receipt indicates the date on which the application was placed with the
local County Clerk and Recorder for public review, pursuant to Rule1.6.2(1)(c).
NOTICE OF FILING AMENDMENT APPLICATION
FOR COLORADO MINED LAND RECLAMATION PERMIT FOR A
REGULAR (112) CONSTRUCTION MATERIALS EXTRACTION OPERATION
Filing for Public Inspection with the Weld County Clerk and Recorders Office
The attached information is being provided for public review of the location and nature of the
proposed amendment to the operation. All changes to the existing permit are on file with the
Division of Reclamation, Mining, and Safety (the "Division") and the Weld County Clerk and
Recorder.
PUBLIC NOTICE
Asphalt Specialties Co., Inc. whose address and phone number is 10100 Dallas Street, Henderson,
Colorado 80640 / (303) 289-8555 has filed an amendment application to the existing Regular (112)
Construction Materials Operation Reclamation Permit from the Colorado Mined Land Reclamation
Board under provisions of the Colorado Land Reclamation Act for the Extraction of Construction
Materials. The mine is known as the Chavers Mining Resource and is located at or near Section 18,
Township 1 North, Range 66 West, 6th Prime Meridian in Weld County, Colorado.
The mine commenced operation in July 2016, and the proposed date of completion is November
2044. The proposed future use of the land is rangeland. Additional information and tentative
decision date may be obtained from the Division of Reclamation, Mining, and Safety, 1313
Sherman Street, Room 215, Denver, Colorado 80203, (303) 866-3567, or at the Weld County Clerk
and Recorder's office at 1250 H Street, Greeley, Colorado 80631, or the above -named applicant.
I, (Printed Name) received the above notification and the associated
application on behalf of the Weld County Clerk and Recorder on , 2024.
, 2024
Signature
Chavers Mining Resource
DRMS Permit No. M-2015-030
Amendment No. 2 (AM -02)
January 2024
Page 22
6.4.18 EXHIBIT S - PERMANENT MAN-MADE STRUCTURES
One (1) additional structure, the Denver Water Lupton Lakes Inlet and Outlet Facility, has been
constructed within 200 feet of the affected land requiring a structure agreement. No change to
previous structure agreements are required. The following is a copy of the Structure Agreement
between ASCI and Denver Water.
Structure Agreement
This letter has been provided to you as the owner of a structure on or within two hundred (200)
feet of a mine site. The State of Colorado, Division of Reclamation, Mining and Safety
("Division") requires that where a mining operation will adversely affect the stability of any
significant, valuable and permanent man-made structure located within two hundred (200) feet of
the affected land, the Applicant shall either:
a) Provide a notarized agreement between the Applicant and the Person(s) having an interest in
the structure, that the Applicant is to provide compensation for any damage to the structure; or
b) Where such an agreement cannot be reached, the Applicant shall provide an appropriate
engineering evaluation that demonstrates that such structure shall not be damaged by activities
occurring at the mining operation; or
c) Where such structure is a utility, the Applicant may supply a notarized letter, on utility
letterhead, from the owner(s) of the utility that the mining and reclamation activities, as
proposed, will have "no negative effect" on their utility. (Construction Materials Rule 6.3.12
and Rule 6.4.19 & Hard Rock/Metal Mining Rule 6.3.12 and Rule 6.4.20)
The Colorado Mined Land Reclamation Board ("Board") has -determined that this form, if -
properly executed, represents an agreement that complies with Construction Materials Rule
6.3.12(a), Rule € 4.19(a), and C.R.S. § 34-32.5-115(4)(e) and with Hard Rock/Metal Mining
Rule 6.3.12(a), Rule 6.4.20(a), and C.R.S. § 34-32-115(4)(d). This form is for the sole purpose of
ensuring compliance with the Rules and Regulations and shall not make the Board or Division a
necessary party to any private civil lawsuit to enforce the terms of the agreement or create any
enforcement obligations in the Board or the Division.
The following structures are located on or within 200 feet of the proposed affected area:
1. Denver Water — Lupton Lakes Inlet and Outlet Facility
2.
3.
4.
5.
(Please list additional structures on a separate page)
CERTIFICATION
The Applicant, Asphalt Specialties. Co.. Inc., by Daniel W. Hunt, as President, does hereby certify
that Denver Water shall be compensated for any damage from the proposed mining operation to
the above listed structure(s) located on or within 200 feet of the proposed affected area described
within Exhibit A, of the Reclamation Permit Application for Ch avers Mining Resource, File
Number M-2015-030.
This form has been approved by the Colorado Mined Land Reclamation Board pursuant to its
authority under the Colorado Land Reclamation Act for the Extraction of Construction
Materials and the Colorado Mined Land Reclamation Act for Hard Rock, Metal, and
Designated Mining Operations. Any alteration or modification to this form shall result in
voiding this form.
NOTARY FOR PERMIT APPLICANT
ACKNOWLEGED BY:
Applicant
Representative Name pen a1 W N urtt`
Date 4/overhiceet )7,
STATE OF Co l o Ket o
) ss.
COUNTY OF ,4 4cprns )
Title Te5rG;er4'"
The foregoing was acknowledged before me this 171*day of /1/ocum Li.ei., 20,A by
'(/
•"-,► as Ti2es,'r 4' _ of Aseha. 5Ce' ..
Notary Public
JAN NELSON
NOTARY PUBLIC
STATE OF COLORADO
NOTARY ID 1030527
My Commission &pil es Aptil 29, 2024
My Commission Expires: / pIr . ,2 g, a2c(
NOTARY FOR STRUCTURE OWNER
ACKNOWLEGED
Structure Own r
Date Nnti'
d411)-'---- Name Am'j
14E(13 Efil A
STATE OF C o 1 A.gd o )
) ss.
COUNTY OF b RA, v R. )
Title 0 ENoiN tlA1b fPRbP
The foregoing was acknowledged before me this n day of Nave ,J>s , 20 22, by
b:✓s&
Ash t j ek,V, MC_ 1,O ,,Z.eYtn- 7e opof W o.& •
Public
GINAREMY
NOTARY P(UC
STATE OF COLORADO
NOTARYO) 2014400M
MY COMMISSION EXPIRES FEBRUARY 24,
My Commission Expires: - o) - aC�
ATTACHMENT 1
AFFIDAVIT FOR CLEAN MATERIAL BACKFILL
AFFIDAVIT
I, Daniel W. Hunt of Asphalt Specialties Co., Inc. (ASCI) hereby certify that only clean
and inert material will be imported at Chavers Mining Resource (DRMS Permit No. M-
2015-030). All material will adhere to the Division's defmition of Inert Material as
defined in Rule 1.1(22).
Daniel W. Hunt, President
Asphalt Specialties Co., Inc.
State of Colorado )
)ss
County of )
The foregoing instrument was acknowledged before me this$ tA/c) ofd t1 , 20�,
by Dan e% W H as ate c,- c— --
att- i'Lt44')74--
Not# Public
My Commission expires:
JAN NELSON
NOTARY PUBLIC
STATE OF COLORADO
NOTARY ID 19994030527
My Commission Expires April 29, 2024
ATTACHMENT 2
GROUNDWATER MONITORING AND MITIGATION PLAN
GROUNDWATER
MONITORING AND MITIGATION PLAN
FOR
CHAVERS MINING RESOURCE
DRMS PERMIT NO. M-2015-030
12367 COUNTY ROAD 8
FORT LUPTON, WELD COUNTY, COLORADO
Prepared by:
ASPHALT SPECIALTIES CO., INC
10100 DALLAS STREET
HENDERSON, COLORADO 80640
303-289-8555 • Fax 303-289-7707
ASPHALT
SPECIALTIES CO.
January 2024
Chavers Mining Resource
Groundwater Monitoring and Mitigation Plan
January 2024
Page ii
TABLE OF CONTENTS
Section Page
1.0 BACKGROUND INFORMATION 1
1.1 SITE DESCRIPTION 1
2.0 BASELINE GROUNDWATER CHARACTERIZATION 1
2.1 MONITORING WELL NETWORK 2
2.1.1 Groundwater Point of Compliance Wells 2
2.2 BASELINE GROUNDWATER QUANTITY 2
2.2.1 Predicted Impacts to Hydrologic Balance 2
2.3 BASELINE GROUNDWATER QUALITY 3
2.3.1 Groundwater Quality Standards 3
2.3.2 Baseline Groundwater Quality Sampling Results 3
3.0 GROUNDWATER MONITORING AND MITIGATION PLAN
3.1 GROUNDWATER QUANTITY
3.1.1 Groundwater Measurement Schedule
3.1.2 Groundwater Quantity Data Evaluation and Trigger Levels
4
4
4
4
3.1.3 Evaluating Impacts to the Hydrologic Balance and Mitigation Measures 4
3.1.4 Reporting 5
3.2 GROUNDWATER QUALITY 5
3.2.1 Groundwater Sampling Schedule 5
3.2.2 Groundwater Sample Collection Procedures 5
3.2.3 Laboratory Analysis of Groundwater Samples 6
3.2.4 Groundwater Quality Data Evaluation and Trigger Levels 6
3.2.5 Evaluating Impacts to Groundwater Quality and Mitigation Measures 6
3.2.6 Reporting 7
LIST OF FIGURES
FIGURE 1 SITE LOCATION MAP
FIGURE 2 GROUNDWATER MONITORING WELL LOCATION MAP
FIGURE 3 BASELINE GROUNDWATER WELL ELEVATIONS
LIST OF TABLES
TABLE 1 MONITORING WELL CONSTRUCTION INFORMATION AND
BASELINE GROUNDWATER ELEVATIONS
TABLE 2 GROUNDWATER QUALITY STANDARDS
TABLE 3 BASELINE GROUNDWATER QUALITY RESULTS - FIRST FIVE (5)
QUARTERS OF DATA
Chavers Mining Resource
Groundwater Monitoring and Mitigation Plan
January 2024
Page iii
LIST OF TABLES (CONTINUED)
TABLE 4 BASELINE GROUNDWATER QUALITY RESULTS - LAST THREE
(3) QUARTERS OF DATA
LIST OF APPENDICES
APPENDIX A MONITORING WELL CONSTRUCTION LOGS
LIST OF ACRONYMS
ASCI Asphalt Specialties Co., Inc.
CDSS Colorado's Decision Support System
DRMS Division of Reclamation, Mining, and Safety
DWR Division of Water Resources
ft amsl feet above mean sea level
ft bgs feet below ground surface
gpd/ft gallons per day per foot
HSA hollow stem auger
POC Point of Compliance
INS Interim Narrative Standards
QA/QC quality assurance/quality control
TDS total dissolved solids
WQCC Water Quality Control Commission
Chavers Mining Resource
Groundwater Monitoring and Mitigation Plan
January 2024
Page 1
1.0 BACKGROUND INFORMATION
Asphalt Specialties Co., Inc. (ASCI) has prepared this Groundwater Monitoring and Mitigation
Plan for the Chavers Mining Resource (Site) located at 12367 County Road 8, Fort Lupton, Weld
County, Colorado (Figure 1). This plan details the results of the baseline groundwater
characterization conducted and future monitoring activities to protect the existing and reasonably
potential future uses of groundwater. This plan has been developed in accordance with the
requirements set forth in the Construction Materials Rule No. 3, Section 3.1.7, and based on
correspondence with Division of Reclamation, Mining, and Safety (DRMS) to ensure the
appropriate data required for protection of groundwater quality and quantity is obtained.
1.1 SITE DESCRIPTION
Mining activities at the Site occur within the unconfined alluvial aquifer of the South Platte River.
The average thickness of the overburden is approximately 3.5 to 4 feet below ground surface (ft
bgs). Beneath the overburden, are low terrace alluvial deposits of the South Platte River. The
deposits vary from sandy lean clay in the upper zones, to coarse clayey sand and sand with gravel
nearer the bedrock. The sand and gravel deposits vary in thickness but averages approximately 28
feet across the Site. Beneath the sand and gravel deposit is the underlying Denver Formation which
is a consolidated bedrock stratum composed primarily of generally impermeable shale and
claystone approximately 550 — 600 feet thick. Surrounding land uses in the area include multiple
other sand and gravel mines, oil and gas industry sites, and rangeland/agricultural lands. Sand and
gravel mining operations have been conducted at the Site since 2016 and the affected area is
approx. 87 acres.
Groundwater in the alluvial aquifer at the Site flows to the north-northwest towards the South
Platte River. Per the Division of Water Resources (DWR) Colorado's Decision Support System
(CDSS) website, the alluvial aquifer has rapid permeability with a transmissivity of approximately
85,000 gallons per day per foot (gpd/ft) and specific yield of 0.2. The estimated coefficient of
storage is 1.5x10-5 to 3.1x10-5. The Site is located within the City of Fort Lupton Wellfield as
classified by the Water Quality Control Commission (WQCC) Regulation 42.
2.0 BASELINE GROUNDWATER CHARACTERIZATION
To characterize baseline groundwater conditions, ASCI collected data for eight (8) consecutive
quarters beginning in the Pt Quarter of 2022. Data collected included monthly groundwater
elevations (for groundwater quantity) and quarterly groundwater sampling events (for groundwater
quality). For the first five (5) quarters, data was collected from the two (2) up -gradient monitoring
wells (MW -2 and MW -3) as they were the only monitoring wells installed at the Site during this
portion of the baseline data collection period. For the last three (3) quarters, data was collected
from all five (5) monitoring wells (MW -2 through MW -6). The total data sets used to characterize
baseline groundwater conditions included 24 months of groundwater elevations and eight (8)
consecutive quarters of groundwater sample laboratory results during the data collection period
(i.e., 1st Quarter 2022 through 4th Quarter 2023).
Chavers Mining Resource
Groundwater Monitoring and Mitigation Plan
January 2024
Page 2
2.1 MONITORING WELL NETWORK
To monitor groundwater quantity and quality at the Site, ASCI utilizes a network of (5)
groundwater wells that have been completed within the unconsolidated alluvial at the Site (i.e.,
MW -2 through MW -6). Borings were installed utilizing 4-1/4" ID hollow stem auger (HSA)
drilling method from ground surface to the top of underlying bedrock. Monitoring wells were
completed at a depth slightly above the top of bedrock encountered. Monitoring wells are
constructed of two (2) -inch diameter Schedule 40 PVC with factory slotted 0.010" slot size for the
screened portions. The filter packs consist of 10/20 silica sand and extend approximately two (2) -
feet above the top of the well screen. A bentonite seal (chips) was installed from the top of the
filter pack to ground surface. At the surface, concrete pads were installed along with a four (4) -
inch square steel well cover with hinged locking cap to protect the above ground riser. Monitoring
well construction details are presented in Table 1. Copies of the monitoring well construction logs
are provided in Appendix A.
2.1.1 Groundwater Point of Compliance Wells
Two (2) of the monitoring wells (MW -2 and MW -3) are located hydraulically up -gradient along
the eastern boundary of the Site. Up -gradient monitoring wells MW -2 and MW -3 were installed
in November 2016. Three (3) monitoring wells (MW -4, MW -5, and MW -6) are located
hydraulically down -gradient along the western and northern permit boundaries of the Site. Down -
gradient monitoring wells MW -4 through MW -6 were installed in June 2023. Down -gradient wells
(MW -4 through MW -6) serve as the designated "Points of Compliance" (POC) wells in
accordance with Rule 3.1.7(6)(b)(ii)(A). The locations of the monitoring wells are shown on
Figure 2.
2.2 BASELINE GROUNDWATER QUANTITY
Groundwater elevations collected from the monitoring wells at the Site between January 2022
through December 2023 are presented in Table 1. The maximum change in groundwater elevation
for any well during the baseline collection period occurred in MW -3 at 5.57 feet and the minimum
change occurred in MW -5 at 3.80 feet. The average change in groundwater elevation from all
wells across the Site during the baseline collection period was 4.53 feet. A graph depicting the
fluctuation in groundwater elevation for each well during the baseline monitoring period is
presented in Figure 3. The groundwater high and low elevations identified for each well during the
baseline collection period will be used as the basis for comparison for future groundwater
measurements collected to demonstrate protection of groundwater quantity throughout the
operational life of the mine until reclamation has been achieved (i.e., when release of reclamation
liability occurs).
2.2.1 Predicted Impacts to Hydrologic Balance
Groundwater elevations at the Site prior to the start of mining are not available. To facilitate dry
mining at the Site, groundwater has been pumped since 2016. Due to the influence of pumping
the pit, the hydrologic balance within the alluvial aquifer at the Site is affected. However, as a
result of the area -wide industrial development east of the South Platte River in the vicinity of the
Chavers Mining Resource
Groundwater Monitoring and Mitigation Plan
January 2024
Page 3
Site, there are multiple other factors present which impact the hydrologic balance in the area (e.g.,
other sand and gravel mines, slurry walls, and/or lined water storage). No wells are located within
600 feet of the dewatering pump location at the Site east of the South Platte River. Due to a lack
of groundwater elevations prior to the industrial development of the area and the start of pumping
at the Site, the extent of impacts to the hydrologic balance at and beyond the Site boundaries cannot
be determined. ASCI will continue to monitor groundwater levels at the Site boundaries to identify
any potential adverse off -site impact to the hydrologic balance when compared against data
collected during the baseline characterization period.
2.3 BASELINE GROUNDWATER QUALITY
2.3.1 Groundwater Quality Standards
The objective of the baseline groundwater sampling was to document the baseline groundwater
quality for applicable analytes and establish the groundwater quality standards for the Site. Per
WQCC Regulation No. 42 "Site -specific Water Quality Classifications and Standards for
Groundwater", the Site is located within the specified area of the City of Fort Lupton Wellfield.
The groundwater classifications in this area are Domestic Use -Quality and Agricultural Use -
Quality. The groundwater quality standards assigned to confined and unconfined groundwater in
the City of Fort Lupton Wellfield are WQCC Regulation 41 Interim Narrative Standards (INS)
Tables 1 — 4 (5 CCR 1002-41). These are the same standards presented in the DRMS guidance
document "Groundwater Monitoring: Sampling and Analysis Plan Guidance, Construction
Materials and Hard Rock Sites" (DRMS, September 2023). Per Rule 3.1.7(2)(c)(ii) and through
correspondence with DRMS, the lowest WQCC Regulation 41 INS Tables 1 — 4 standard for
applicable analytes is utilized as the default numeric protection value benchmark (i.e., groundwater
quality standard), except for analytes where the baseline groundwater concentration exceed these
values. For these analytes, the highest concentration reported during the baseline groundwater
sampling period is be used as a site -specific groundwater quality standard.
A complete list of the groundwater quality standards for the Site is presented in Table 2. These
standards will be used for comparison against future groundwater sampling event results to
demonstrate protection of existing and reasonably potential future uses of groundwater throughout
the operational life of the mine until reclamation has been achieved (i.e., when release of
reclamation liability occurs). Any change to the analytes on the list (e.g., reduction of analytes) or
groundwater quality standard values will be submitted to DRMS via Technical Revision for
approval prior to implementing.
2.3.2 Baseline Groundwater Quality Sampling Results
Results of the eight (8) quarters of baseline groundwater sampling events used to determine the
groundwater quality standards for the Site are presented in Tables 3 and 4. Results are compared
against the lowest WQCC Regulation 41 INS Tables 1 — 4 standards for applicable analytes. As
shown in Tables 3 and 4, results for two (2) analytes during the baseline monitoring period
(Manganese and Sulfate) exceeded the lowest WQCC Regulation 41 INS Tables 1 — 4 standards.
Therefore, the highest concentration reported for Manganese and Sulfate during the eight (8)
Chavers Mining Resource
Groundwater Monitoring and Mitigation Plan
January 2024
Page 4
quarters of baseline groundwater sampling will be used as the site -specific groundwater quality
standard. Results for all other analytes were below their respective WQCC Regulation 41 INS
Tables 1— 4 standards.
3.0 GROUNDWATER MONITORING AND MITIGATION PLAN
The following activities will be conducted by ASCI to monitor groundwater quantity and quality
throughout the operational life of the mine until reclamation is complete.
3.1 GROUNDWATER QUANTITY
3.1.1 Groundwater Measurement Schedule
ASCI will collect monthly groundwater elevation readings from monitoring wells MW -2 through
MW -6. ASCI will compare monthly groundwater levels against the baseline groundwater level
data for each well within one (1) week of collection to determine if any impact to the hydrologic
balance have occurred. Groundwater measurements will continue for a minimum of 12 additional
months (i.e., January 2024 to December 2024). Any change to the groundwater level monitoring
schedule (i.e., reduction in measurement frequency) will be submitted to DRMS via Technical
Revision for approval prior to implementing.
3.1.2 Groundwater Quantity Data Evaluation and Trigger Levels
Groundwater elevations naturally fluctuate throughout the year based on the season but can also
be influenced by a variety of unusual conditions at any one time (e.g., persistent rain or drought).
The primary trigger for evaluating if potentially adverse impacts to the hydrologic balance have
occurred will be if the groundwater level in any well either increases two (2) feet above the baseline
high measurement or drops two (2) feet below the baseline low measurement. The trigger
measurements for each well are provided in the following table.
Well ID
Baseline GW
Elevation — High
(ft amsl)
Trigger Elevation
for Evaluating
High GW Impacts
(ft amsl)
Baseline GW
Elevation — Low
(ft amsl)
Trigger Elevation
for Evaluating Low
GW Impacts
(ft amsl)
MW -2
4909.62
4911.62
4905.13
4903.13
MW -3
4904.64
4906.64
4899.07
4897.07
MW -4
4907.23
4909.23
4902.72
4900.72
MW -5
4912.89
4914.89
4909.09
4907.09
MW -6
4909.11
4911.11
4904.82
4902.82
Notes:
ft amsl = feet above mean sea level
3.1.3 Evaluating Impacts to the Hydrologic Balance and Mitigation Measures
Should groundwater elevations exceed two (2) feet above the baseline high measurement or drop
two (2) below the baseline low measurement in any monitoring well, ASCI will contact DRMS
Chavers Mining Resource
Groundwater Monitoring and Mitigation Plan
January 2024
Page 5
within five (5) days of discovery to discuss the path forward. Potential mitigation measures may
include:
• Increase groundwater measurement frequency to determine if impacts are anomalous
and/or temporary.
• Determine if impacts to the hydrologic balance can be sourced to changes in the mining
operation implemented at the Site.
• Evaluate the existing data set to determine if any trends are present in up -gradient and
down -gradient wells.
ASCI will work with DRMS to assess whether impacts may potentially be adverse and/or if
additional mitigation measures are appropriate based upon the situation encountered at that time.
3.1.4 Reporting
Unless impacts to the hydrologic balance are identified as described in Sections 3.1.2 and 3.1.3,
ASCI will continue to report groundwater level data to DRMS as supplemental information with
the annual report for the Site each year as is the current practice.
3.2 GROUNDWATER QUALITY
3.2.1 Groundwater Sampling Schedule
ASCI will conduct quarterly groundwater sampling at the Site for a minimum of four (4)
consecutive quarters (i.e., let Quarter 20224 to 401 Quarter 2024). For each sampling event,
groundwater samples will be collected from each of the five (5) monitoring wells (MW -2 through
MW -6) and submitted for laboratory analysis. In addition, a duplicate quality assurance/quality
control (QA/QC) groundwater sample will be collected from one of the monitoring wells per event
(six [6] total samples per event). Additional QA/QC samples (e.g., method blanks, laboratory
control samples, matrix spikes, etc.) will be analyzed by the laboratory during batch analyses with
results provided in the final laboratory reports. Any change to the groundwater quality monitoring
schedule (i.e., reduction in sampling frequency) will be submitted to DRMS via Technical
Revision for approval prior to implementing.
3.2.2 Groundwater Sample Collection Procedures
Prior to sampling each well, depth to groundwater and total well depth measurements will be
collected using a water level indicator to the nearest 0.01 foot. Groundwater will then be purged
from the well utilizing a submersible pump with dedicated tubing or hand -bailed with a dedicated
bailer. All non -dedicated equipment used to collect groundwater measurements and samples will
be decontaminated with a detergent (e.g., Alconox® Detergent Powder) and distilled water
solution prior to use at each monitoring well. A new pair of clean, disposable nitrile gloves will be
utilized for sample collection at each well. Purged water will be collected in five (5) gallon buckets
where water quality parameter readings for temperature, pH, specific conductivity, and total
dissolved solids (TDS) will be collected. The total purge volume from the well will be recorded.
Once groundwater stabilization is achieved (i.e., three consecutive readings within ten percent of
Chavers Mining Resource
Groundwater Monitoring and Mitigation Plan
January 2024
Page 6
each other for all stabilization parameters) and/or a minimum of three (3) well volumes are
removed, groundwater will be collected directly into laboratory -supplied containers with the
preservative appropriate for the analysis requested, as applicable. The samples will be labeled,
placed in a cooler with ice (cooled to 4°C), and stored until delivery to the laboratory accompanied
by chain -of -custody documentation.
3.2.3 Laboratory Analysis of Groundwater Samples
Groundwater samples submitted to the laboratory will be analyzed for thirty (30) applicable
WQCC Regulation 41 INS Tables 1— 4 analytes. The following analytical methods (or comparable
methods) will be utilized by the laboratory to report water quality results.
Nineteen (19) Metals (Dissolved) by EPA Method 200.8
Two (2) Metals (Dissolved) by EPA Method 200.7
Six (6) Inorganic Anions by EPA Method 300.0 + Calculation
Chromium by Standard Method (SM) 3500-Cr B + Calculation
pH by SM 4500 -H -B
TDS by SM 2540-C
3.2.4 Groundwater Quality Data Evaluation and Trigger Levels
ASCI will compare laboratory results against the groundwater quality standards developed for the
Site (Table 2) within one (1) week of receipt to determine if any exceedance(s) of the groundwater
quality standards has occurred. The primary trigger for evaluating if potentially adverse impacts
to groundwater have occurred will be if results for any analytes exceed their site -specific
groundwater quality standard.
3.2.5 Evaluating Impacts to Groundwater Quality and Mitigation Measures
If analyte exceedance(s) of site -specific groundwater quality standards are reported in up -gradient
monitoring wells (MW -2 through MW -3), this would indicate the impact to groundwater quality
is potentially from an off -site source. Should analyte exceedance(s) occur in up -gradient wells
only, ASCI will monitor results from subsequent groundwater monitoring sampling events to
determine if elevated concentration(s) of the analyte(s) persist and/or if migration to down -gradient
POC wells (MW -4 through MW -6) occurs. If exceedance(s) of site -specific groundwater quality
standards occur in POC wells (MW -4 through MW -6), ASCI will contact DRMS within five (5)
days of discovery to discuss the path forward. Potential mitigation measures may include:
• Conduct confirmation sampling of well(s) to verify results.
• Evaluate the existing data set to determine if any trends are present in up -gradient and
down -gradient wells.
• Increase groundwater sampling event frequency to determine if impacts are anomalous
and/or temporary (e.g., sample quarterly until two [2] consecutive quarters of monitoring
Chavers Mining Resource
Groundwater Monitoring and Mitigation Plan
January 2024
Page 7
data indicates that results for the previously exceeding analyte(s) are at or below site -
specific groundwater quality standards in POC wells).
Conduct a statistical trend analysis to determine: 1) if exceedances are statistically
significant increases over background; and/or 2) if a new site -specific groundwater
quality standard is appropriate (to be submitted to DRMS as a Technical Revision).
ASCI will work with DRMS address impacts identified in POC wells and/or if additional
mitigation measures are appropriate based upon the situation encountered at that time.
3.2.6 Reporting
Unless exceedance(s) above site -specific groundwater quality standards in POC wells are
identified as described in Sections 3.2.4 and 3.2.5, ASCI will report groundwater quality
monitoring results to DRMS as supplemental information with the annual report for the Site each
year.
FIGURES
• 4960 •
_ -
4944
CHAVERS MINING RESOURCE
Asphalt Specialties Co., Inc.
10100 Dallas St.
Henderson, CO 80640
Phone: 303-289-8555
CHAVERS
Well
Lone Pine
Gravel •
e, Pit
Mobile ott
Water
Tank
DING RESOURCE
SITE LOCATION MAP
GWMMP PLAN
FIGURE 1
FORT LUPTON QUAD
E 1/2 OF THE SW 1/4 S18, T1 N, R68W
0
N
DENVER WATER
LUPTON LAKES INLET
OUTLET FACILITIES
SITE ACCESS
REV
1
�� -'
I / �\ O
I , I
I/ / 1
f ....
1 /� /
7//I
,/-
4.1
i
/ i
G'
/ T'�
7
PROPERTY BOUNDARY / - -
� �--
AFFECTED AREA BOUNDARY `
IN
is
IS �1w,
I
RMIT BOUNDARY
Cell 5
-4 Acres
Cell t
pp -4 Acres
lL
CONCRETE
PLANT
SE CORNER OF THE SW 1/4
SECTION 18. TIN, R66W
REVISIONS
DESCRIPTION
DATE
•
W W
L,,
APPROVED
\ kt
r
cJ / //f/ ?so
♦ i L.
/ / TE
,Atitf
1'
MW -4
N
SpO `\N
4 p
f7't771Tf f rmn 1'M1T1 11 frIVI 7 17 nn 1�f7'rfl 17' nn—
•
MOS en swam
Cell 4
-23 acres
Cell 6
-4 Acres
/
••
'
:
S.
•
•
•
.,
•
•
Se
••
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
so. —
-- -
1T
;I',
•
N.
MW -3
/7-
Cell 3
-32 acres
MW -5
PROPERTY BOUNDARY
MW4
lab ::::11:. 4.PERMIT' $I A.H��` \
[` �••1. AFFECTED AREA
1
: I
`,4'; MW -6
E entiwicilifi
■ I I %-•
1 11 'T�t
• •may
T
Jr
Cell 2
-8 acres
r f
f - I
BOUNDARY
t
I
I
i
•
MAP LEGEND
EXISTING EDGE OF PAVEMENT
EXISTING ANADARKO PIPELINES
EXISTING OIL & GAS WELL HEAD
♦ EXISTING UTIUTY POLE
EXISTING BURIED TELEPHONE UNE
-•+-•+-'"- EXISTING
EXISTING
- - EXISTING
EXISTING
- s- .- -4- -r EXISTING
EXISTING
--- -EXISTING
EXISTING
ramPanar
• •.• •sue t
1.1
BURIED GAS LINE
BARBED WIRE FENCE
EDGE OF GRAVEL ROAD
RIVER
DRAINAGE DITCH
PROPERTY BOUNDARY
ADJOINING PARCEL BOUNDARY
SECTION LINE
EXISTING RIGHT OF WAY UNE
EXISTING RIP RAP SPUR DIKE/1NEIR
STRUCTURES (COOT)
• - - Im PERMIT BOUNDARY
EXTENT OF MINING
CELL BOUNDARY
f tI I tttI AFFECTED AREA BOUNDARY
PROPOSED DIRECTION OF MINING
SERVICE ROADS (GRAVEL)
EXTENT OF MINING AREA = -75 ACRES
AFFECTED AREA = -87 ACRES
PERMIT BOUNDARY = -95 ACRES
i
= Up -gradient
Monitoring Well
• = Down -gradient
Monitoring Well
Point of Compliance
(POC) Well
= Inferred Groundwater
Flow Direction
/
/2 I /
//
//
1
1
/
1
/
150' 300' 375' 450'
SCALE: 1" = 150'
Asphalt Specialties Co., Inc.
10100 Dallas Street
Henderson, CO 80640
Phone: 303-289-8555
Fax: 303-289-7707
CHAVERS MINING RESOURCE
GROUNDWATER MONITORING AND MITIGATION PLAN
FORT LUPTON, CO
FIGURE 2 - MONITORING WELL
LOCATION MAP
SCALE 1"=150'
DA* NO
REV
1.0
PREPARED FOR
ASPHALT SPECIALTIES CO., INC.
DRAWN BY
CHECKED BY
DAT
11/14/2023
SHEET
1 OF 1
Figure 3 - Chavers Mining Resource
Baseline Groundwater Well Elevations
January 2022 - December 2023
Tan
E
Ca
z
0
H
>
J
w
w
I-
Q
a
z
0
0
4916
4915
4914
4913
4912
4911
4910
4909
4908
4907
4906
4905
4904
4903
4902
4901
4900
4899
4898
4897
4896
-- MW -2 -a- MW -3 -e- MW -4 MW -5 -- MW -6
I T i T f I 1 I
f I f 1
N N N N N N N N N N N N CO CO
N N N N N N N N N N N N N N
II a (�cu
—) Q) O O O u_Q w z 0
TIME
co
L
co
N
I
Q
N
I
CO
N
I
a)
CD
N
I
0
CO CO
N N
O 0)
Z 0
TABLES
Chavers Mining Resource
Monitoring Well Construction Information and
Baseline Groundwater Well Elevations
January 2022 - December 2023
Well Consturction Information
MW -2
MW -3
MW -4
MW -5
MW -6
TOC (ft amsl)
4926.62
4919.63
4923.13
4919.96
4919.03
Ground (ft amsl)
4922.77
4915.88
4920.21
4916.93
4916.25
Stick-up (ft ags)
3.85
3.75
2.92
3.03
2.78
Total Depth from TOC
37.58
36.17
32.35
32.18
32.10
Total Depth (ft bgs)
33.73
32.42
29.43
29.15
29.32
Table 1
Month & Year
MW -2
MW -3
MW -4
MW -5
MW -6
SWL TOC
(ft)
(ft
SWL
bgs)
GW Elev.
(ft amsl)
SWL TOC
(ft)
(ft
SWL
bgs)
GW Elev.
(ft amsl)
SWL TOC
(ft)
(ft
SWL
bgs)
GW Elev.
(ft amsl)
SWL TOC
(ft)
(ft
SWL
bgs)
GW Elev.
(ft amsl)
SWL TOC
(ft)
(ft
SWL
bgs)
GW Elev.
(ft amsl)
January 2022
19.72
15.87
4906.90
18.83
15.08
4900.80
Well Not Installed
Well Not Installed
Well Not Installed
February 2022
19.64
15.79
4906.98
18.71
14.96
4900.92
Well Not Installed
Well Not Installed
Well Not Installed
March 2022
18.98
15.13
4907.64
18.75
15.00
4900.88
Well Not Installed
_
Well Not Installed
Well Not Installed
April 2022
18.84
14.99
4907.78
18.37
14.62
4901.26
Well Not Installed
Well Not Installed
Well Not Installed
May 2022
18.56
14.71
4908.06
17.93
14.18
4901.70
Well
Not Installed
Well Not Installed
Well Not Installed
June 2022 _ _
18.33
14.48
4908.29
17.45
13.70
4902.18
_
Well Not Installed
Well Not Installed
Well Not Installed
July 2022
17.00
13.15
4909.62
18.23
14.48
4901.40
_
Well Not Installed
Well Not Installed
Well Not Installed
August 2022
18.11
14.26
4908.51
18.82
15.07
4900.81
Well Not Installed
Well Not Installed
Well Not Installed
September 2022
18.16
14.31
4908.46
19.13
15.38
4900.50
Well Not Installed
Well Not Installed
Well Not Installed
October 2022
18.24
14.39
4908.38
19.66
15.91 _
4899.97
Well
Not Installed
_
Well Not Installed
Well Not Installed
November 2022
18.50
14.65
4908.12
20.26
16.51
4899.37
Well
Not Installed
Well
Not Installed
Well Not Installed
December 2022
18.77
14.92
4907.85
20.35
16.60
4899.28
Well Not Installed
Well Not Installed
Well
Not Installed
January 2023
18.43
14.58
4908.19
19.79
16.04
4899.84
Well Not Installed
Well Not Installed
Well Not Installed
February 2023
18.31
14.46
4908.31
20.29
16.54
4899.34
Well Not Installed
Well Not Installed
Well Not Installed
March 2023
18.62
14.77
4908.00
20.31
16.56
4899.32
_
Well Not Installed
Well Not Installed
Well
Not Installed
April 2023
20.00
16.15
4906.62
20.56
16.81
4899.07
Well Not Installed
Well Not Installed
Well Not Installed
May 2023
19.34
15.49
4907.28
19.82
16.07
4899.81
Well
Not Installed
Well
Not Installed
Well Not Installed
June 2023
17.81
13.96
4908.81
14.99
11.24
4904.64
15.90
12.98
4907.23
7.07
4.04
4912.89
9.92
7.14
4909.11
July 2023
18.26
14.41
4908.36
15.58
11.83
4904.05
17.54
14.62
4905.59
8.32
5.29
4911.64
10.71
7.93
4908.32
August 2023
20.38
16.53
4906.24
17.85
14.10
4901.78
19.75
16.83
4903.38
10.52
7.49
4909.44
12.98
10.20
4906.05
September 2023
20.67
16.82
4905.95
18.56
14.81
4901.07
19.94
17.02
4903.19
10.69
7.66
4909.27
13.44
10.66
4905.59
October 2023
21.36
17.51
4905.26
19.17
15.42
4900.46
19.87
16.95
4903.26
10.45
7.42
4909.51
13.34
10.56
4905.69
November 2023
21.32
17.47
4905.30
19.65
15.90
4899.98
20.26
17.34
4902.87
10.64
7.61
4909.32
13.95
11.17
4905.08
December 2023
21.49
17.64
4905.13
20.37
16.62
4899.26
20.41
17.49
4902.72
10.87
7.84
^r?c fl
14.21
11.43
4904.82
Groundwater Elevation (High)
17.00
13.15
4909.62
14.99
11.24
4904.64
15.90
12.98
4907.23
7.07
4.04
4912.89
9.92
7.14
4909.11
Groundwater Elevation (Low)
21.49
17.64
4905.13
20.56
16.81
4899.07
20.41
17.49
4902.72
10.87
7.84
4909.09
14.21
11.43
4904.82
GW Elevation Difference (ft)
=
4.49
5.57
4.51
3.80
4.29
Notes:
ags = above ground surface
amsl = above mean sea level
bgs = below ground surface
ft = feet
TOC = Top of Casing
Chavers Mining Resource
Groundwater Quality Standards
Table 2
Analytes
CAS No.
Units
INS Table 1
INS Table 2
INS Table 3
INS Table 4
Lowest INS Tables 1 - 4
Groundwater Quality
Standards
Chavers
Groundwater Quality
Standards
Domestic Water Supply:
Human Health Standards
Domestic Water Supply:
Drinking Water Standards
Agricultural Standards
TDS Water Quaity Standards
Dissolved
Aluminum
7429-90-5
mg/L
-
5
--
'
5
5
Antimony
7440-36-0
mg/L
0.006
--
--
--
0.006
0.006
Arsenic
7440-38-2
mg/L
0.01
0 1
--
0.01
0.01
Barium
7440-39-3
mg/L
2
--
--
--
2
2
Beryllium
7440-41-7
mg/L
0.004
--
0.1
--
0.004
0.004
Boron
7440-42-8
mg/L
--
--
0.75
-
0.75
0.75
Cadmium
7440-43-9
mg/L
0.005
--
0.01
--
0.005
0.005
Chloride
16887-00-6
mg/L
--
250
--
--
250
250
Chromium (Total) [Cr(Ill) + Cr(VI)]
7440-47-3
mg/L
0.1
--
0 1
-
0.1
0.1
Cobalt
7440-48-4
mg/L
--
-
0.05
--
0.05
0.05
Copper
7440-50-8
mg/L
--
1
0.2
--
0.2
0.2
Flouride
16984-48-8
mg/L
4
--
2
-
2
2
Iron
7439-89-6
mg/L
--
0.3
5
--
0.3
0.3
Lead
7439-92-1
mg/L
0 05
--
0.1
--
0.05
0.05
Lithium
7439-93-2
mg/L
--
--
2.5
-
2.5
2.5
Manganese
7439-96-5
mg/L
--
0.05
0 2
--
0.05
0.397
Molybdenum
7439-98-7
mg/L
0.21
--
--
-
0.21
0.21
Nickel
7440-02-0
mg/L
0.1
--
02
-
0.1
0.1
Nitrate (NO3)
14797-55-8
mg/L
10
--
--
--
10
10
Nitrite (N02)
14797-65-0
mg/L
1
--
10
--
1
1
Nitrate -Nitrite, Total (NO2 +NO3)
-
mgiL
10
100
--
10
10
Selenium
7782-49-2
mg/L
0.05
0 02
--
0.02
0.02
Silver
7440-22-4
mg/L
0.05
--
--
--
0.05
0.05
Sulfate
14808-79-8
mg/L
--
250
--
--
250
301.12
Thallium
7440-28-0
mg/L
0.002
-
--
0.002
0.002
Total Dissolved Solids (TDS)
10-33-3
mg/L
--
--
Based on Result
1.25 x Background
1267.5
Uranium
7440-61-1
mg/L
0.03
--
0.03
0.03
Vanadium
7440-62-2
mg/L
--
--
0 1
--
0.1
0.1
Zinc
7440-66-6
mg/L
--
5
2
--
2
2
Other
pH
.-
III g:L
--
65-8.5
65-8.5
-- 1
6.5-8.5
6.5-8.5
Notes:
= Lowest INS Table 1 - 4 Standard
= Groundwater Quality Standard per Lowest INS Table 1 - 4 Standard
= Site -specific Groundwater Quality Standard per Baseline Sampling Results
All samples are filtered through 0.45 micron filter prior to preservation
Parameters Excluded from Groundwater Monitoring Program:
INS Table 1
INS Table 2
INS Table 3
INS Table 4
Total Coliforms (30 day average)
Chlorophenol
Mercury
None
Total Coliforms (max in 30 days)
Color
Asbestos
Corrosivity
Cyanide [Free]
Foaming Agents
Mercury
Odor
Gross Alpha Particle Activity
Phenol
Beta and Photon Emitters
Chavers Mining Resource
Baseline Groundwater Quality Results
First Five (5) Quarters of Data
1st Quarter 2022 - 1st Quarter 2023
Table 3
Sample Event:
1st Quarter Sampling Event
2nd Quarter Sampling Event
3rd Quarter Sampling Event
4th Quarter Sampling Event
5th Quarter Sampling Event
Well Type:
BKG
Wells (Up -gradient)
BKG Wells (Up -gradient)
BKG Wells (Up -gradient)
BKG
Wells (Up -gradient)
BKG
Wells (Up -gradient)
Lowest
Chavers
Sample ID:
MW -2
MW -3
MW -3D
MW -2
MW -2D
MW -3
MW -2
MW -3
MW -3D
MW -2
MW -2D
MW -3
MW -2
MW -3
MW -3D
INS Tables 1 - 4
Groundwater
Site -Specific
Groundwater
Analyte/Parameters
CAS No.
Date:
3/29/2022
3/29/2022
3/29/2022
6/28/2022
6/28/2022
6/28/2022
9/21/2022
9/21/2022
9/21/2022
12/6/2022
12/6/2022
12/6/2022
3/30/2023
3/30/2023
3/30/2023
Quality Standards
Quality Standards
Type:
Grab
Grab
QA/QC
Grab
QA/QC
Grab
Grab
Grab
QA/QC
Grab
QAIQC
Grab
Grab
Grab
QA/QC
Units
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
_
-I
Dissolved
ter.,
_-
0.018
0.018
0.012
0.011
0.006
0.016
0.031
0.025
0.037
0.042
0.017
0.034
0.009
0.011
5
5
7429-90-5
mg/L
0.009
Aluminum
0.0012
U
0.006
0.006
0.0012 U
0.0012
U
0.0012
U
0.0012 U
0.0012
U
0.0012
U
0.0012
U
0.0012
U
0.0012
U
0.0012
U
0.0012
U
0.0012
U
0.0012
U
0.0012
U
Antimony
7440-36-0
mg/L
0.0006
U
0.0006
U
0.0006
U
0.01
0.01
0.0006 U
0.0006 U
0.0006
U
0.0006 U
0.0006 U
0.0006
U
0.0006 U
0.0006 U
0.0006
U
0.0006
U
0.0006 U
0.0006
U
Arsenic
7440-38-2
mg/L
2
2
0.0695
0.0682
0.104
0.1054
0.0628
0.1038
0.0697
0.0704
0.125
0.1228
0.0767
0.1044
0.0604
0.0595
7440-39-3
mg/L
0.0918
I.
Barium
0.0001
U
0.0001
U
0.0001 U
0.0001
U
0.0001
U
0.0001
U
0.0001
U
0.004
0.004
U
0.0001 U
0.0001
U
0.0001 U
0.0001
U
0.0001
U
0.0001 U
0.0001 U
Beryllium
7440-41-7
mg/L
0.0001
0.75
0.75
0.33
0.35
0.18
0.18
0.47
0.22
0.55
0.56
0.26
0.26
0.46
0.22
0.38
0.38
0.21
Boron
7440-42-8
mg/L
U
0.0001
U
0.005
0.005
U
0.0001
U
0.0001
U
0.0001 U
0.0001
U
0.0001
U
0.0001
U
0.0001
0.0001
U
0.0001 U
0.0001
0.0001
0.0001 U
0.0001
7440-43-9
mg/L
0.0001
Cadmium
206.15
207.31
250
250
225.37
224.67
151.23
152.94
232.65
154.63
231.48
237.28
187.09
188.42
229.63
199.55
16887-00-6
mg/L
152.94
Chloride
U
0.0015
U
0.0015
U
0.0015 U
0.1
0.1
0.0015
U
0.0015 U
0.0015 U
0.0015 U
0.0015 U
0.0015
U
0.0015 U
0.0015
U
0.0015 U
0.0015 U
0.0015 U
0.0015
Chromium
(Total)
[Cr(III) + Cr(VI)]
7440-47-3
mg/L
0.0019
0.0007
0.0007
0.05
0.05
0.0006
0.0006
0.002
0.002
0.0005
0.0006
0.0006
0.0021
0.0021
0.0006
0.0022
7440-48-4
mg/L
0.0018
Cobalt
0.0013
0.001
0.001
0.2
0.2
0.0014
0.002
0.002
0.0018
0.0018
0.0017
0.0015
0.0017
0.0017
0.0016
0.0019
0.0014
Copper
7440-50-8
mg/L
1.44
2
2
0.86
1.16
1.2
1.2
1.2
1.36
1
U
1.41
1.51
1.52
1.07
1.08
1.45
16984-48-8
mg/L
1.05
Flouride
0.005 U
0.005 U
0.3
0.3
0.005
0.005
0.007
0.008
0.007
0.011
0.013
0.021
0.005 U
0.005 U
0.005
U
0.008
7439-89-6
mg/L
0.015
Iron
0.0001
U
0.0001
U
0.0001 U
0.0001
U
0.0001
U
0.05
0.05
U
0.0001 U
0.0001
U
0.0001 U
0.0001 U
0.0001
U
0.0001
U
0.0001
U
0.0001
U
0.0001
U
7439-92-1
mg/L
0.0001
Lead
0.05
U
0.05 U
0.03
0.03
0.03
2.5
2.5
0.04
0.04
0.05
U
0.05 U
0.05 U
0.05
0.05 U
0.05 U
0.05
U
7439-93-2
mg/L
0.04
Lithium
0.0008 U
0.0021
0.0018
0.0024
0.05
0.397
0.0008 U
0.0008 U
0.0008 U
0.002
0.0017
0.0008 U
0.0008
U
0.0213
0.0175
0.0014
7439-96-5
mg/L
0.0192
Manganese
0.008
0.0077
0.0071
0.0061
0.0131
0.0129
0.21
0.21
0.0151
0.0146
0.0102
0.0098
0.0164
0.007
0.0117
0.0116
7439-98-7
mg/L
0.0095
Molybdenum
0.0027
0.0025
0.0026
0.0023
0.0023
0.1
0.1
0.0028
0.0027
0.0029
0.0028
0.0028
0.0028
0.0028
0.0027
0.0026
7440-02-0
mg/L
0.0027
Nickel
3.46
3.78
3.81
10
10
5.31
5.27
2.57
2.59
1.19
4.36
1.67
1.68
4.13
4.21
2.53
14797-55-8
mg/L
7.41
Nitrate
(NO3)
U
0.03 U
0.3 U
0.3 U
0.3 U
1
1
U
0.03
U
0.03
U
0.03
U
0.03 U
0.03 U
0.03
U
0.03
U
0.03 U
0.03
U
0.03
14797-65-0
mg/L
0.03
Nitrite (NO2)
3.46
3.78
3.81
10
10
5.31
5.27
2.57
2.59
1.19
4.36
1.67
1.68
4.13
4.21
2.53
mg/L
7.41
Nitrate
-Nitrite,
Total
(NO2
+NO3)
-
0.0016
0.0008
U
0.0012
0.0009
0.02
0.02
7782-49-2
mg/L
0.0015
0.0021
0.002
0.001
0.0012
0.0013
0.0029
0.0022
0.002
0.0022
0.0015
Selenium
0.05
0.05
J
U
0.0005 U
0.0005
U
0.0005
U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005
U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005
U
7440-22-4
mg/L
0.0005
Silver
201.31
237.66
239.2
250
301.12
301.12
299.95
217.05
220.6
280.63
218.16
282.62
286.04
231.22
231.87
265.12
14808-79-8
mg/L
194.82
Sulfate
0.0002 U
0.0002
U
0.0002 U
0.0002 U
0.0002
U
0.002
0.002
0.0002
U
0.0002
U
0.0002 U
0.0002
U
0.0002
U
0.0002 U
0.0002 U
0.0002 U
0.0002 U
0.0002 U
Thallium
7440-28-0
mg/L
a
823
888
892
1267.5
1267.5
979
973
783
780
884
765
1014
1008
890
895
996
10-33-3
mg/L
776
Total Dissolved
Solids
(TDS)
0.007
0.0072
l 0.0069
0.0037
0.0151
0.0148
0.03
0.03
0.0071
0.0254
0.0253
0.0077
0.0073
0.0067
0.0071
0.0171
0.0175
7440-61-1
mg/L
Uranium
0.001
U
0.001
U
0.001 U
0.001
U
0.001
U
0.001
U
0.001
U
0.001
U
0.001 U
0.001
U
0.001 U
0.001
U
0.001
U
0.001
U
0.001
U
0.1
0.1
Vanadium
7440-62-2
mg/L
U
0.001
U
0.001
U
0 001
U
0.001
U
2
2
U
0 001
U
0.001
0.001 U
0.001
0.001
U
0.001 U
0.001 U
0.001 U
0.001
0.001
0.001
Zinc
7440-66-6
mg/L
7.0
7.3
7.4
6.5-8.5
6.5-8.5
I
7.1
I 7.2
6.7
6.7
6.6
7.6
7.5
I 7.3
7.5
6.9
7.5
7.7
-
-
su
PH
Notes:
Bold
a
BKG
INS
mg/L
P0C
su
U
WQCC
= Chavers Site -Specific Groundwater Quality Standard value
= Source of Chavers Site -Specific Groundwater Quality Standard value
= Background concentration result exceeds lowest applicable INS Tables 1 - 4 standard
= Highest Background TDS value
= Concentration detected above reporting limit
= Calculated Value (Per WQCC Regulation No. 41, for Background TDS Value between 501 -10,000 mg/L, the Maximum Allowable TDS Concentration is 1.25 times the background value)
= Background
= Interim Narrative Standard
= milligrams per liter
= Point of Compliance
= standard unit
= Analyte not detected above reporting limit
= Water Quality Control Commission
Chavers Mining Resource
Baseline Groundwater Quality Results
Last Three (3) Quarters of Data
2nd Quarter 2023 - 4th Quarter 2023
Table 4
Sampling Event
Sample Event:
6th Quarter Sampling Event
7th Quarter Sampling Event
8th Quarter
BKG
POC Wells -gradient)
Lowest
Chavers
Well Type:
BKG Wells (Up -gradient)
POC Wells (Down -gradient)
BKG Wells (Up -gradient)
POC Wells (Down
-gradient)
Wells (Up
-gradient)
(Down
Sample ID:
MW -2
MW -3
MW -4
MW -0D
MW -5
MW -6
MW -2
MW -3
MW -4
MW -5
MW -5D
MW -6
MW -2
MW -3
MW -4
MW -5
MW -6
MW -6D
INS Tables 1 - 4
Groundwater
Site -Specific
Groundwater
Analyte/Parameters
CAS No.
Date:
6/29/2023
6/29/2023
6/29/2023
6/2912023
6/30/2023
6/30/2023
9/26/2023
9/26/2023
9/26/2023
9/26/2023
9126/2023
9/26/2023
12114/2023
12/15/2023
12/15/2023
12/15/2023
12/15/2023
12/15/2023
Quality Standards
Quality Standards
Type:
Grab
Grab
Grab
QA/QC
Grab
Grab
Grab
Grab
Grab
Grab
QA/QC
Grab
Grab
Grab
Grab
Grab
Grab
QA/QC
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
mg/L
Units
mg/L
mg/L
mglL
i•
0.003
5
5
0.022
2.47
0.026
0.022
0.011
0.008
0.003
0.01
0.003
0.002
0.004
0.003
0.013
0.014
0.0017
7429-90-5
mg/L
0.007
0.005
Aluminum
U
0.0012 U
0.0012 U
0.0012 U
0.006
0.006
U
0.0012 U
U
0.0012 U
0.0012 U
0.0012 U
0.0012 U
0.0012 U
0.0012
7440-36-0
mg/L
0.0012 U
0.0012 U
0.0012 U
0.0012 U
0.0012 U
0.0012 U
0.0012
0.0012
Antimony
0.0008
0.0007
0.0009
0.0008
0.01
0.01
0.0007
0.001
0.0006 U
0.0009
0.001
0.0011
0.0012
0.0006 U
0.0006 U
7440-38-2
mg/L
0.0006 U
0.0006 U
0.0014
0.0011
0.0007
Arsenic
2
2
0.1632
0.0464
0.0737
0.0704
0.0708
0.0704
0.08
0.0586
0.0773
0.0634
0.0695
0.0667
Barium
7440-39-3
mg/L
0.0932
0.0531
0.0488
0.0473
0.0214
0.063
U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.004
0.004
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0003
0.0001
7440-41-7
mg/L
Beryllium
0.22
0.22
0.19
0.4
0.36
0.25
0.24
0.25
0.24
0.75
0.75
V
0.2
0.3
0.21
Boron
7440-42-8
mg/L
0.23
0.44
0.1
0.1
0.07
0.13
0.0002
0.0002
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001
0.0001 U
0.0001 U
0.0003
0.0003
0.0006
0.0006
0.005
0.005
Cadmium
7440-43-9
mg/L
0.0001
0.0001 U
0.0001
0.0001
0.0001 U
73.22
221
164
160
159
160
156
165
209
185
179
196
195
250
250
Chloride
16887-00-6
mg/L
178.22
201.83
72.66
73.71
57.76
U
0.0015 U
0.0015 U
0.0015 U
0.0015 U
0.0015 U
0.0015 U
0.0015 U
0.0015 U
0.1
0.1
0.0015 U
0.002
0.0015 U
0.0015 U
0.0015
Chromium (Total) [Cr(III) + Cr(VI)]
7440-47-3
mg/L
0.0015 U
0.0015 U
0.0015 U
0.0015 U
0.0015 U
0.0005
0.0005
0.0004
0.0009
0.0004
0.0006
0.0009
0.0006
0.0006
0.05
0.05
U
0.0003
0.0025
0.0005
0.0003
Cobalt
7440-48-4
mg/L
0.0011
0.0008
0.0003
0.0003
0.0002
0.0028
0.0027
0.0066
0.0011
0.001
0.0077
0.0028
0.0104
0.0108
0.2
0.2
7440-50-8
mg/L
0.0017
0.0016
0.0065
0.0062
0.0021
0.0111
0.0054
0.0013
0.0054
Copper
0.92
0.89
0.71
0.94
1.25
0.62
0.77
0.77
0.78
2
2
1.61
1.09
1.59
0.8
Flouride
16984-48-8
mg/L
1.03
1.32
1 U
1 U
0.76
0.005 U
0.005 U
0.005 U
0.005 U
0.005 U
0.005
0.014
0.005
0.005
0.3
0.3
0.016
0.016
0.007
0.01
Iron
7439-89-6
mg/L
0.005 U
0.005 U
0.005 U
0.01
0.016
U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001
0.0002
0.0002
0.0002
0.05
0.05
U
0.0002
0.0047
0.0001 U
0.0001
Lead
7439-92-1
mg/L
0.0001 U
0.0001 U
0.0001 U
0.0001 U
0.0001
0.025
0.031
0.03
0.04
0.04
0.04
0.04
0.026
0.029
0.037
0.036
0.036
0.036
2.5
2.5
7439-93-2
mg/L
0.026
0.024
0.025
0.025
0.013
Lithium
0.0019
0.0015
0.0013
0.0008 U
0.0021
0.0008 U
0.0017
0.0028
0.0017
0.002
0.05
0.397
0.0246
0.0028
0.0291
0.397
0.0009
Manganese
7439-96-5
mg/L
0.0062
0.0008 U
0.022
0.21
0.21
0.0018
0.005
0.0145
0.0068
0.0088
0.0089
0.0077
0.0078
0.0119
0.006
0.006
0.0065
0.0067
Molybdenum
7439-98-7
mg/L
0.0096
0.0127
0.0053
0.0053
0.0031
0.0016
0.0017
0.0023
0.0023
0.0019
0.0022
0.002
0.0023
0.0024
0.0023
0.0023
0.1
0.1
Nickel
7440-02-0
mg/L
0.0023
0.0024
0.0015
0.0015
0.0009 U
0.0014
0.0042
2.67
2.64
2.88
2.75
1.5
3.89
3.78
3.67
3.65
10
10
0.17
3.89
1.25
3.04
14797-55-8
mg/L
2.36
1.76
3.85
3.87
1.24
Nitrate (NO3)
U
0.03 U
0.03 U
0.03 U
0.03 U
0.03 U
0.03 U
0.03 U
0.03 U
0.03 U
0.03 U
0.03 U
0.03 U
0.03 U
1
1
Nitrite (NO2)
14797-65-0
mg/L
0.3 U
0.3 U
0.3 U
0.3 U
0.03
0.17
3.89
1.25
3.04
2.67
2.64
2.88
2.75
1.5
3.89
3.78
3.67
3.65
10
10
Nitrate -Nitrite, Total (NO2 +NO3)
-
mg/L
2.36
1.76
3.85
3.87
1.24
0.0019
0.0024
0.0011
0.0023
0.0018
0.0008
0.0016
0.0017
0.02
0.02
0.0008 U
0.0023
0.002
0.0022
0.0018
0.0013
0.0013
0.0026
0.0024
0.0008 U
Selenium
7782-49-2
mg/L
U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.05
0.05
Silver
7440-22-4
mg/L
0.0005 U
0.0005 U
0.0005 U
0.0005 U
0.0005
185
188
190
190
184
170
232
168
167
1.66
167
250
301.12
59.17
106.25
175
Sulfate
14808-79-8
mg/L
179.7
243.78
98.66
99.6
0.0002 U
0.0002 U
0.0002 U
0.0002 U
0.0002 U
0.0002 U
0.0002 U
0.0002 U
0.0002 U
0.0002 U
0.0002 U
0.002
0.002
0.0002 U
0.0002 U
0.0002 U
Thallium
7440-28-0
mg/L
0.0002 U
0.0002 U
0.0002 U
0.0002 U
540
628
683
697
685
687
858
700
719
768
717
1267.5
1267.5
294
545
723
Total Dissolved Solids (TDS)
10-33-3
mg/L
890
887
427
460
0.0088
0.03
0.03
0.0029
0.0021
0.0057
0.0088
0.0106
0.0083
0.0084
0.0088
0.0037
0.0158
0.0087
0.0078
0.0089
0.0157
0.0008
0.0006
7440-61-1
mg/L
0.0055
Uranium
0.001 U
0.001 U
0.001
0.001 U
0.001
0.001
0.1
0.1
0.001
0.001 U
0.004
0.001 U
0.002
0.001
0.001
0.002
0.001 U
0.001 U
0.002
0.002
Vanadium
7440-62-2
mg/L
0.009
2
2
0.001 U
0.001
0.006
0.006
0.003
0.001 U
0.001 U
0.003
0.025
0.009
0.002
0.003
0.012
0.012
Zinc
7440-66.6
m! L
0.001 U
0.001 U
0.002
•
_-
-
6.5
7.0 1
7.2
6.8 I
7.4
I 7.4
7.0
7.2
I 7.3
7.2
7.2
7.2
7.3
6.5 - 8.5
6.5 - 8.5
-
Su
7.3
7.7
7.0
6.9
7.2
pH
Notes:
Bold
a
BKG
INS
mg/L
POC
su
U
WQCC
= Chavers Site -Specific Groundwater Quality Standard value
= Source of Chavers Site -Specific Groundwater Quality Standard value
= Background concentration result exceeds lowest applicable INS Tables 1 - 4 standard
= Highest Background TDS value
= Concentration detected above reporting limit
= Calculated Value (Per WQCC Regulation No. 41, for Background TDS Value between 501 - 10.000 mg/L, the Maximum Allowable TDS Concentration is 1.25 times the background value)
= Background
= Interim Narrative Standard
= milligrams per liter
= Point of Compliance
= standard unit
= Analyte not detected above reporting limit
= Water Quality Control Commission
APPENDIX A
MONITORING WELL CONSTRUCTION LOGS
ASPHALT
SPECIALTIES CO.
10100 Dallas Street
Henderson, Co 80640
Phone: 303-289-8555
Asphalt Specialties Co., Inc.
Chavers Mining Resource.
Monitoring Well Construction Log: MW -2
Date: 11/17/2016 Well Material: 2" Schedule 40 PVC
Drilling Company:Terracon Well Lat. / Long:: 40.046245° / -104:820551°
Drilling Method: Hollow Stem. Auger (HSA) Ground Elevation: 4,922.77 ft amsl
h=-
wen'°
-
GRAPHIC
LOG
-
LITH0L0GIC DESCRIPTION
WELL CONSTRUCTION
-, -
APPROX.
DEPTH TO
WATER
(Drilling)
g -
E
;u x
w.....
... _3_,
2 _
`
Concrete
Pad
-
Protective
Casing
4.926_
4.925_
4.924_
� 4,923
0
2
•Silt,
Ground Surface .. ..
dark brown, dry (Overburden)
;� .....
�
cn
� .. .
j
/
�::•::�::...
' ' ' '
........ .:�:�
L
N
..
- -
4,922
4,921
4,920_
4,919_
4,918 _
.4,917
4,916
.4,915
4,914-
_
4,913 —
4,912
4,911
4,910_
4,909. _
4.908—
_
.4,906
4,905-
4,904 _
4,903
4,902 _
X4,901
.4,900._
4.,899
4,898 —
-4,897.—
4,895 —
4,894
4.893
4,892
4,691. -.
4,890_
' 4,889
�ir
C
jJ yy-
5
6
8
9
10
11
12
.15
--
-16=
r,}
,, f x
Sir`r f i3
{l1 'dh �
�SfC,
sa�5 `9f{
,�
rcrs)^')x
;�S`,.
- iv:Yt.
15 it�fL Y�:
`�Fr
•. �,...
Sand and gavel, tan, dry (Alluvium)
-
_
- .. - - -
--- - -- - -- --------- - =--
2
c
CD
-. r0. -
O-
C
N --i..41
i.7)
O
N
;..
—4
s
s�i@,�r,;
}? t
j%'inrd*
-
17
4' L
At
,�SYs
��r
--0--
- ..
.. ..
..
=�i
-
rill
U
— - .. ._-4,907=.
Q
23
24?'�-x$
25`jr$
28
29 --,70
30
31
32
33
34Syyn
ha n,
)h-
''r
rs'c
e� aY}p
' t55)y;' ,,,"`�
"��
r95
,,,,
p r y
n��tr
r���
Sand and gavel, tan, wet (Alluvium)
..
-
-
-
..
✓,;_,
#
} 4
f
��. .=—I,
�
4
4-,
Q
_
,
ci
20 ft bgs
-' -
-
..
I
IIIIiiIIIIIr
Top of Shale encountered at 34.5 feet bgs (Bedrock)
ASPHALT
SPECIALTIES CO.
10100 Dallas Street
Henderson, CO 80640
Phone: 303-289-8555
Asphalt Specialties Co., Inc.
Chavers Mining Resource
Monitoring Well Construction Log: MW -3
Date: 11/17/2016 Well Material: 2.. Schedule 40 PVC
Drilling Company:Terracon Well Lat. /Long.: 40.050300° / -104.820150°
Drilling Method: Hollow Stem Auger (HSA) Ground Elevation: 4,915.88 ft amsl
as
GRAPHIC.
'L.G
LITHOLOGIC DESCRIPTION
WELL CONSTRUCTION
APPROX.
DEPTH TO
WATER
(Orllling)
N
la
Concrete
Pad
Ground. Surface
1
2 _
3
4
5
6
7
8
11_
• 12.
13 .
14�
17
18
ig
20_
21
22
23
24
25_
26
27
28
29
30
31
32
33
%J.
II _
Sandy silt, dark brown, dry (Overburden)
rII
01
0
01
Sand and gavel, tan, dry (Alluvium)
Sand and gavel, tan, wet (Alluvium)
Protective
Casing
4.919
• 4:918
4.917
4,916
///':
Q .
18ftbgs
Top of Shale encountered at 33 feet bgs (Bedrock)
4,915 •
4,914_
4,913_
4,912'
4,911• _
4,910_
4,909
4,908
4,907
4,906
4,905
4,904
4,903
4,902
4,901
-4,900
4,899
4,898
4,897
4,696
• 4,895
4,894
4,893 ._
4,892
4,891
4,890
4,889
4,888 -_
4,887
4,866
4,885 •
4,884
4,883
ASPHALT
SPECIALTIES CO.
10100 Dallas Street.
Henderson, CO 80640
Phone: 303-289-8555
Asphalt Specialties Co., Inc.
Chavers Mining Resource
Monitoring Well Construction Log: MW -4
Date: 6/22/2023
Drilling Company:Terracon
Drilling Method: Hollow Stem Auger (HSA)
Well. Material:. 2" Schedule 40 PVC
Well Lat. /Long.: 40.047449° / -104.824594°
Ground Elevation: 4,920.21 ft amsl
GRAPHIC
ox__ LOG
LITHOLOGIC DESCRIPTION WELL CONSTRUCTION
APPROX..
DEPTH.TO
WATER
(0/I/rig)
Ground Surface
Sandy silt,dark brown, dry (Overburden)
Sand 'and gavel, tan, dry(Alluvium)
moisture present at -7 ft bgs
Sand -and gavel, fan, wet (Alluvium)
20
22
27
28
2
Total Depth of Boring 30 feet bgs
Concrete
Pad
immummtrisi
� o�/r
i
®J
Protective
Casing
0.010" Slotted Scr
A.923._
4.922
.921
4,920
13 ft bgs
_4,919
4,918 _
4,917
4,916
4,915._
.4,914
4,913
4,912
4,911
4,910_
4,909
4,908
4,907
4,906
4,905
_4,904
4,903
4,902
4,901
4,900
4,899
4,898
4,897
4;896
4,895
4,894
4,893
4,892
4,891
4,890
ASPHALT
SPECIALTIES C O .
10100 Dallas Street
Henderson, CO 80640
Phone: 303-289-8555
Asphalt Specialties Co., Inc.
Chavers Mining Resource
Monitoring Well Construction Log: MW -5
Date: 6/28/2023 Well Material: 2" Schedule 40 PVC
Drilling Company: Terracon Well Lat. / Long 40.051625° / -104.823754°
Drilling Method: Hollow Stem Auger (HSA) Ground Elevation: 4,916.93 ft amsl
= TO;
}-
W'
-
GRAPHIC
LOG
..
.. ..
LITHOLOGIC DESCRIPTION
.. ..
WELL CONSTRUCTION
APPROX..
DEPTH TO
WATER
(Drilling,
ii c
', -g
uJ
-3
;_.
-.
. - - - - - ..
.
-Concrete
Pad l
\Protective
Casing
4.920_
4919=
4918_
x,917
0
�� _
2
Ground Surface
Sandy silt, dark . brown, dry (Overburden)
10/20'Silica SandiPack Bentonite Seal
f
:x'
%'
• � i ti
4,916
4,915_
4,914
4,913 _
4,912
4'911 —
4,909
4,908
4,907 _
4,906 _
4
5
ayi'Ir
rA 7t
rT .'
Sand and gavel, tan, dry. (Alluvium)
:
.i}ruxt
zr'"
r t`'t
_
�.
6
9
10
11
, `':
≥„,,, )f
3tNsY�L�”
2n�2n�`'.,
Sand and gavel, _tan wet (Alluvium) .
-
"�
,...=r�
=c
iS.:
5.5 n bgs
12
13
14
16
;, ,_, .
--- ------- -
- - -.:
_
r.-
---,
=
-
4,905 _
4,904 _
4,903--
4,902 _
—4,901—,_1
4,900 _
- 4,899
4,898-
4,897 _
4,896
4,895
4,894
4,893
4,892
4,891.
4,890
4,889
4,888
4,887
17
18
20
2 +r+'tkr•.ti�
'''
1 .,,r
-
-
�'
—_�
0.010" Slotted Screen,
21
22
23
25
27
28
29.
30
tir iSf.
N :;
s. ,s,''
is { a
fits .'
s:
js .,, 47
s k 4}:
d . ,.:
p..
-
-
.:
,:.77
J
—�
_
-
II11I(1111I11II(II.Top of Shale encountered at 30 feet bgs (Bedrock)
ASPHALT
SPECIALTIES CO.
10100 Dallas Street
Henderson, CO 80640
Phone: 303-289-8555
Asphalt Specialties Co., Inc.
Chavers Mining Resource
Monitoring Well Construction Log: MW -6
Date: 6/28/2023
Drilling Company:Terracon
Drilling Method: Hollow Stem Auger (HSA)
Well Material: 2" Schedule 40 PVC
Well Lat. / Long.: 40.053389° / -104.822248°
Ground Elevation: 4,916.25 ft amsl
as
GRAPHIC
LOG
LITHOLOGIC DESCRIPTION
WELL CONSTRUCTION
APPROX.
DEPTH TO
WATER
(Drilling)
> A
m �
-3
2 —
-1
0
Ground Surface
Concrete
Pad
2
3
4
5
6
7
—
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Sandy silt, dark brown, dry (Overburden)
fA
O
Sand and gavel, tan, dry (Alluvium)
Sand and gavel, tan, wet (Alluvium)
r,
\Protective
Casing
ES
4.919
4.976 J
4.917
4,916
0.010" Slotted Screen
Q
7 ft bgs
Total Depth of Boring 30 feet bgs
4,915
4,914
4,913
4,912
4,911
4,910
4,909
4,908
4,907
4,906
4,905
4,904
4,903
4,902
4,901
4,900
4,899
4,898
4,897
4,896
4,895
4,894
4,893
4,892
4,891
4,890
4,889
4,888
4,887
4,886
ATTACHMENT 3
INTEGRATED NOXIOUS WEED MANAGEMENT PLAN
INTEGRATED NOXIOUS WEED MANAGEMENT PLAN
FOR
CHAVERS MINING RESOURCE
12367 COUNTY ROAD 8
FORT LUPTON, WELD COUNTY, COLORADO
DRMS PERMIT NO. M-2015-030
Prepared by:
ASPHALT SPECIALTIES CO., INC
10100 DALLAS STREET
HENDERSON, COLORADO 80640
303-289-8555 • Fax 303-289-7707
ASPHALT
=Milk
SPECIALTIES CO.
January 2024
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page ii
TABLE OF CONTENTS
Section Page
1.0 INTRODUCTION 1
1.1 PROPERTY INFORMATION 1
1.2 WEED MANAGEMENT PRIORITIES AND GOALS 2
1.3 LOCAL AGENCY EVALUATION AND CONSULTATION 2
2.0 OVERVIEW OF TARGETED WEED SPECIES 3
2.1 SITE -SPECIFIC TARGETED WEED SPECIES 3
3.0 MANAGEMENT OPTIONS FOR TARGETED WEED SPECIES 5
3.1 CONTROL METHODS 5
3.2 LIST B WEED SPECIES - CONTROL METHODS REQUIRED 6
3.2.1 Scotch Thistle 6
3.2.2 Hoary Cress 6
3.3 LIST C WEED SPECIES - CONTROL METHODS NOT REQUIRED 7
3.3.1 Cheatgrass 7
3.3.2 Field Bindweed 7
4.0 SITE -SPECIFIC INTEGRATED WEED MANGEMENT PLAN 8
5.0 BASIC WEED MANAGEMENT GUIDELINES 8
5.1 BASIC CULTURAL CONTROL GUIDELINES 9
5.2 BASIC MECHANICAL CONTROL GUIDELEINES 9
5.3 BASIC CHEMICAL CONTROL GUIDELINES 9
5.3.1 SPRAY DRIFT MANAGEMENT 10
5.4 BASIC BIOLOGICAL CONTROL GUIDELINES 12
LIST OF FIGURES
FIGURE 1 INTEGRATED NOXIOUS WEED MANAGEMENT PLAN MAP
LIST OF APPENDICES
APPENDIX A TARGETED WEED SPECIES - FACT SHEETS
APPENDIX B GENERAL HERBICIDE CHEMICAL SELECTION SHEETS
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 1
1.0 INTRODUCTION
This Integrated Noxious Weed Management Plan has been developed to control noxious weed
species within the Division of Reclamation, Mining, and Safety (DRMS) permit boundary for the
Chavers Mining Resource (Site — Figure 1). This plan identifies existing noxious weeds on the
property that are comingled with other native plant species that are present (e.g., western
wheatgrass). This plan contains noxious weed management practices, typically recommended by
Colorado State University and other weed organization professionals. Weed management practices
have been tailored to the specific weed problems identified at the Site. The weed management
approach to gain control of the invasive species at the Site presented in this plan is based on the
following concepts.
1) Weed control must be applied and evaluated over an extended period to be successful.
2) The basic steps of weed control include identification of weed species, locating the weed
problem, development of control and prevention strategies, implementation of those
strategies, and ongoing monitoring to assess the effectiveness of the efforts.
3) To prevent/minimize the infestation and spread of noxious weeds, semi-annual
inspections of the permitted area will be conducted in the spring and fall of each year to
evaluate site conditions at the time and monitor response to previous treatments.
Appropriate weed control actions shall be implemented whenever noxious weed species are
observed on the property. This plan identifies specific treatment methods and timetables. Plans
may be modified based in new invasions of weed based on the species of concern, location and
extent of the infestation, and other pertinent factors. Development of this plan is in accordance
with Section 3.1.10 (6) of the Mineral Rule and Regulations of the Colorado Mined Land
Reclamation Board for the Extraction of Construction Materials.
1.1 PROPERTY INFORMATION
Property Owner
Hunt Brothers Properties
Mine Operator
Asphalt Specialties Co., Inc. (ASCI)
DRMS Permit No.
M-2015-030
Site Address
12367 County Road 8, Fort Lupton, Weld County, Colorado
Latitude / Longitude
40.048389° / -104.822318°
Elevation
— 4,920 feet above mean sea level (ft amsl)
Permitted Acreage
— 95 acres
Acreage Disturbed
— 87 acres
Soil Types (—% of Property)
Aquolls and Aquents, gravelly substratum (-73%); Ellicott -Ellicott
sandy -skeletal complex, 0 to 3 percent slopes, rarely flooded (-22%);
and Ustic Torriorthents, moderately steep (—.5%).
Chaves Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 2
1.2 WEED MANAGEMENT PRIORITIES AND GOALS
The priorities of this weed management plan are to: 1) contain current noxious weed infestations;
2) suppress and/or eliminate noxious weed species present; and 3) prevent potential invasive weed
species in Weld County from infesting the Site. General descriptions of these basic weed
management goals for the Site are below:
Elimination/Eradication: Elimination (or eradication) is the complete removal of a
weed infestation. It is the implementation of a short-term but intensive control effort to
completely purge a targeted weed infestation permanently from an area (unless
reintroduced). Elimination is desirable and possible for small weed patches, but not
always for larger ones. (Important note: if eradication creates an open environment, a
weed problem may be cured simply to create another one; therefore, it is essential to
revegetate the ground to prevent another infestation).
Containment: Containment prevents weed encroachment onto non -infested areas. It is
the creation and enforcement of confining perimeters around the infestation. This is
achieved by eradicating plants on the exterior of the infestation's designated perimeter
and those along vector corridors (such as roads , streams, trails) that may help spread the
infestation beyond the perimeter.
Suppression: Suppression reduces weed density and area. It is the use of a wide variety
of weed management techniques that reduce the density and severity of infestations
within the boundaries of containment perimeters. This is done to mitigate the harm to
agriculture, the environment, and other values caused by widespread and well -established
populations of noxious weeds.
1.3 LOCAL AGENCY EVALUATION AND CONSULTATION
ASCI contacted the Weld County Public Works Department - Weed Management Division for
assistance in preparing this weed management plan. A site visit to identify the types, locations,
and extents of noxious weeds present at the Site was conducted with Weed Management Division
Supervisor, Ms. Tina Booton, on December 4, 2023. Information regarding the identification and
management strategy for noxious weeds obtained from the Weed Management Division is present
throughout this plan. Below is contact information for the Weed Management Division.
Weld County Public Works Department
Weed Management Division
1111 H Street
Greeley, CO 80631
Phone: (970) 400-3770
E-mail: tbooton@weldgov.com
Website: https://www.weldgov.com/departments/public works/weed management
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 3
2.0 OVERVIEW OF TARGETED WEED SPECIES
Noxious weeds in Colorado are categorized based on the extent of infestation within the state.
Colorado Noxious Weeds - List A: List A species are not well established in Colorado,
are potentially a large problem to this state, and require mandatory eradication by local
governing agencies. Prescribed techniques for management of List A species are hand
pulling, digging, or herbicide application. Mowing, grazing, and insect bio-control are not
acceptable forms of management for these species.
Colorado Noxious Weeds - List B: List B species are common enough in parts of the
state that eradication is not feasible, though the species are still recommended for
eradication, suppression, or containment depending on distribution and densities around
the state. Prevention of seed dispersal may be accomplished by mowing, hand pulling,
tillage, grazing, or herbicide application.
Colorado Noxious Weeds List C: List C species are widespread and well established.
Control of List B and C species is recommended, but not required by the state. However,
local governing bodies may require management.
No List A weeds have been identified at the Site. Section 2.1 identifies the primary List B and C
weed species of concern and provides general descriptions and information about the weeds.
2.1 SITE -SPECIFIC TARGETED WEED SPECIES
The following table lists the most prevalent noxious weeds species of concern identified at the
Site. These are the primary targets for management, management strategy (i.e., priority and goal),
and extent of infestation (Figure 1). Copies of the Targeted Weed Fact Sheets are provided in
Appendix A.
Noxious Weed Species Identified
(Scientific Name)
State/County
List
Management
Priority
Designation Goal
Infestation
Density
Scotch Thistle
(Onopordum acanthium)
B
1st
Containment &
Suppression
Medium
Hoary Cress
(Cardaria draba)
B
1st
Containment &
Suppression
Medium
Cheatgrass
(Bromus tectorum)
C
2nd
Suppression
Light
Field Bindweed
(Convolvulus arvensis)
C
2nd
Suppression
Light
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 4
Scotch Thistle (Onopordum acanthium): Scotch thistle (Onopordum acanthium) is a
non-native biennial forb that reproduces solely by seed. A biennial is a plant that
completes its lifecycle within two years. During the first year of growth, Scotch thistle
appears as a rosette in spring or fall. During the second year in mid to late spring — the
stem bolts, flowers, sets seed, and the plant dies. A prolific seed producer, Scotch thistle
can produce up to 14,000 seeds per plant. Scotch thistle can grow up to 12 feet tall. Stems
are numerous, branched, and have broad, spiny wings. The leaves are large, green, spiny,
and covered with fine dense hair giving the leaf a woolly appearance. The flowers are
violet to reddish in color, numerous (70-100/plant), and are surrounded by spine -tipped
bracts. You can expect to see flowers from mid -June to September. Due to the robust,
spiny nature of Scotch thistle, this plant can act as a living barbed wire fence, making
areas impassible for wildlife, livestock, and people. Scotch thistle invades rangeland,
overgrazed pastures, roadsides, and irrigation ditches. It also prefers moist areas adjacent
to creeks and rivers.
Hoary Cress (Cardaria draba): Hoary Cress (Cardaria draba) is a non-native perennial
that spreads by seeds and aggressive, creeping, roots that vigorously produce new plants.
Depending on conditions, hoary cress grows to a height of 1 to 2 feet tall. The first
leaves emerge from a crown and are dull gray -green, oblong and often have a slightly
wavy margin. Subsequent leaves are alternate, have short fine hairs and an irregularly
toothed margin. Only the lower leaves have stems, others are stalk -less and clasp the
plant stem with two ear -like lobes. Flowers _are -fragrant, numerous,=small,_ white with4
petals and grow in compact clusters. Hoary cress is a member of the Mustard family. In
the fall seeds germinate and rosettes become established. It frequently flowers in April
and May and again in the fall during optimum conditions. Seed production begins about
one month later. Hoary cress produces up to 4800 seeds per plant. Seed viability is up to
3 years. However, the primary means of spread is the vertical and horizontal root system.
Root fragments are capable of forming new plants. In one year, a single plant, without
competition, can spread vegetatively to cover an area 12 feet in diameter and can produce
450 shoots. Hoary cress can be found in disturbed open sites, roadsides, ditches, riparian
areas, grain and vegetable fields. It does especially well in irrigated crops such as alfalfa
and sugar beets. Hoary cress grows well in most soil conditions, including alkaline soils.
However, it does not tolerate shade.
Cheatgrass (Bromus tectorum): Commonly referred to as cheatgrass, (Bromus
tectorum) it is also known as downy brome, downy cheat and bronco grass. It is widely
distributed throughout the United States and has been reported to be the dominant species
on more than 100 million acres of the intermountain west. Cheatgrass is unique in that it
occupies a dual role as a serious weed and important early season forage. Cheatgrass can
maintain dominance for many years on sites where native vegetation has been eliminated
or severely reduced by grazing, cultivation or fire. Cheatgrass is a winter annual member
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 5
of the grass (Poaceae) family. It reproduces by seed which germinates in the fall, over
winters as a seedling and flowers in the spring. Seed can remain viable in the soil for 2 to
5 years. Cheatgrass can grow in almost any soil type and readily adapts to varying
precipitation. Cheatgrass can be several inches to more than 18 inches tall. It has a
nodding seed head with many finely hairy drooping spikelets. As it matures the seed
heads and foliage often become reddish and then progress to a light tan.
Field Bindweed (Convolvulus arvensis): Field bindweed (Convolvulus arvensis) is a
non-native deep-rooted perennial that reproduces from seed and creeping, horizontal
roots (rhizomes). Field bindweed stems prostrate (grows low to the ground) and twine
and grow up to 6 feet long. Leaves are distinguishable by their arrowhead shape. The
flowers are bell or trumpet -shaped, white to pink in color, and are about 1 inch long.
Field bindweed seeds can remain viable in the soil for up to 40 years. Field bindweed
emerges from its root system in the spring. Flowering occurs from June to September and
until- the first fall frost. The number of seeds produced per plant ranges from 25 to 300
and seed production is variable depending on environmental conditions. Field bindweed
is an extremely difficult noxious weed to control because, in part, of its root that may go
20 feet deep into the soil, and which repeatedly -gives -rise -to -numerous long rhizomes. - -
3.0 'MANAGEMENT OPTIONS FOR TARGETED WEED SPECIES -
Management of weed species can vary from species to species. The following sections provide a
summary of effective control methods and timing for implementation to treat each targeted noxious
weed species present at the Site.
3.1 -CONTROL METHODS
Integrated management is a program of noxious weed control that properly implements a variety
of coordinated control methods which greatly improves the success rate for weed control. There
are no cure-alls for noxious weeds — no single tool will work every time in every situation. The
solution is integrated management, which combines, or integrates, different tools to provide more
effective weed control than any single tool could produce. The stress and damage caused by one
tool weakens the target, making it more susceptible to damage caused by other tools. Types of
control methods include:
Cultural — Introducing and promoting competitive species (i.e., competitive grasses,
planted cottonwood cuttings, etc.) have proven to be effective at reducing the chances of
re -invasion. Information is available from the local Colorado State University (CSU)
Extension office or Natural Resources Conservation Service office for proper seed mix
recommendations.
Mechanical — Mechanical controls include mowing, cutting, pulling, clipping, fire,
grazing, tillage, grubbing.
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 6
Chemical/Herbicides - A variety of herbicide options exist that will control noxious
weeds. The active ingredient will vary based on the specific noxious weed species.
Information about herbicides can be found on the Crop Data Management Systems, Inc.
website (www.cdms.net) and specific specimen labels are available for viewing online..
Whichever herbicide you choose to use, remember to read the herbicide label before
using the product and follow all directions and precautions. Always read, understand, and
follow label directions. The herbicide label is the LAW!
Landowners should provide consent for use of chemicals/herbicides prior to application.
All contracted professional herbicide applicators must be fully licensed by the Colorado
Department of Agriculture.
Biological — Not all sites are suitable for biological control. The use of insects will also
require some maintenance and considerations for their lifecycle and behavior. Insects can
be obtained at no charge from the Colorado Department of Agriculture - Palisade
Insectary. Please call (970) 464-7916, e-mail: insectary@state.co.us,or go to
www.palisadeinsectray.com for more information.
3.2 LIST B WEED SPECIES - CONTROL METHODS REQUIRED
3.2.1 Scotch Thistle
Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of
Scotch thistle. Contact your local -CSU Extension office or Natural Resources Conservation -
Service office for seed mix recommendations. Good grazing management will stimulate grass
growth and keep pastures healthy. Healthy pastures may be more resistant to Scotch thistle
invasion. Bare spots caused by overgrazing are prime habitat for weed infestations.
Mechanical — Any mechanical or physical method that severs the root below the soil surface will
kill Scotch thistle. Mowing or chopping is most effective when Scotch thistle plants are at full
bloom. Be sure to properly dispose of the flowering cut plants since seeds can mature and become
viable after the plant has been cut down.
Chemical/Herbicides — Herbicides that can be applied to range and pasturelands for Scotch thistle
are provided on the fact sheet presented in Appendix A.
Biological — There are no biological control insects available that will control Scotch thistle.
3.2.2 Hoary Cress
Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of
hoary cress. Contact your local CSU Extension office or Natural Resources Conservation Service
office for seed mix recommendations. Good grazing management will stimulate grass growth and
keep pastures healthy. Healthy pastures may be more resistant to hoary cress invasion. Bare spots
caused by overgrazing are prime habitat for weed infestations.
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 7
Mechanical — Due to the extensive root system, hand -pulling this plant is not a viable option.
Repeated tillage (every 10 to 14 days) can destroy colonies in 2 to 4 years. Combining mowing
with herbicides will further enhance control of this weed. Apply herbicides in spring and/or fall,
and then mow during the summer months. Mowing alone is not an effective control option.
Chemical/Herbicides — Herbicides that can be applied to range and pasturelands for Hoary Cress
are provided on the fact sheet presented in Appendix A.
Biological — No known biological control agents available at this time.
3.3 LIST C WEED SPECIES - CONTROL METHODS NOT REQUIRED
3.3.1 Cheatgrass
Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of
cheatgrass. Contact your local CSU Extension office or Natural Resources Conservation Service
office for seed mix recommendations. Good grazing management will stimulate grass growth and
keep pastures healthy. Healthy pastures may be more resistant to cheatgrass invasion barespots
caused by overgrazing are prime habitat for weed infestations.
Mechanical — Fire, mowing, grazing, tillage, and inter -seeding competitive species have all shown
promise in reducing cheatgrass populations. Long lasting control requires a combination of
chemical, physical, vegetative -suppression -and proper livestock management.
Chemical/Herbicides — Herbicides that can be applied to range and pasturelands for Cheatgrass
are provided on the fact sheet presented in Appendix A.
Biological — Biological control is limited. Rabbits and mice will feed extensively on the seedlings
as will migratory grasshoppers. But there is no long-term biocontrol agent available.
3.3.2 Field Bindweed
Cultural — Establishment of selected, aggressive grasses can be an effective cultural control of
field bindweed. Contact your local CSU Extension office or Natural Resources Conservation
Service office for seed mix recommendations. Good grazing management will stimulate grass
growth and keep pastures healthy. Healthy pastures may be more resistant to field bindweed
invasion. Bare spots caused by overgrazing are prime habitat for weed infestations.
Mechanical — Cutting, mowing, or pulling has a negligible effect unless the plants are cut below
the surface in the early seedling stage. Well -established populations have a large seed bank in the
soil that can remain viable for over 40 years.
Chemical/Herbicides — Herbicides that can be applied to range and pasturelands for Cheatgrass
are provided on the fact sheet presented in Appendix A.
Biological — The bindweed gall mite, Aceria mahlerbae, has proven to be effective in reducing
field bindweed infestations. Biocontrol agents can be obtained at no charge from the Colorado
Department of Agriculture's Insectary (Phone: 970-464-7916 or www.palisadeinsectary.com).
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 8
4.0 SITE -SPECIFIC INTEGRATED WEED MANGEMENT PLAN
Overall weed management at the Site will be monitored during semi-annual inspections (prior to
and after seeding) to evaluate the effectiveness of previous activities conducted and for the
strategies being implemented. Changes to control methods and/or implementation schedule will
be made, as necessary. Due to the current extent of the pit, access to all the areas of concern for
equipment is limited. If weeds are determined to be spreading beyond current containment, ASCI
will implement mechanical controls (e.g., mowing) to manage priority targeted weed species
present when backfill of the Site allows for safe passage of equipment to access areas of concern
identified. This will prevent seed production/spreading of weeds and allow for further cultural
establishment of the native plant species and competitive grasses already present at the Site.
Mowing will be conducted two (2) times per year during the operational life of the mine once
feasible to implement. The first mowing will occur in the spring to early summer as the plants bolt,
but before the plants flower (roughly April through early June). The second mowing will occur in
the fall as the plants prepare for winter dormancy (late September or early October).
Due to the adjacent South Platte River on the western boundary, the application of spray herbicides
poses a significant risk to these sensitive receptors (Figure 1). Factors outside the control of a
licensed commercial spraying applicator (e.g., sustained wind speeds or gusts greater than 10 miles
per hour [mph] during application causing drift, herbicide runoff, etc.) could result in the
contamination of waters and/or other private property. To avoid possible adverse impacts from
herbicides, ASCI will begin to implement chemical/herbicide controls the season prior to
reclamation seeding. Chemical/herbicide controls implemented will consist of full application
and/or spot treatment of weeds, as appropriate. The actual chemical(s)/herbicide(s) used will be
selected by the licensed commercial spraying applicator; however, herbicides that can be applied
to range and pasturelands are provided on the fact sheets presented in Appendix A and general
chemical/herbicide selection sheets are presented in Appendix B. Per Weld County Public Works
Department - Weed Management Division recommendation, a Piper E -Z combination (Liquid: 20
oz./acre; Granular: 10 oz./acre) is recommended for soft bare ground and to keep existing grasses.
5.0 BASIC WEED MANAGEMENT GUIDELINES
Noxious weed management is not a one-time effort. To obtain your desired level of management,
you will need to perform control measures for several years. Work will include observation,
control application, observation of controls effectiveness and eradication of the weed population.
Work at small infestations and the perimeters of larger infestations first. This will help keep
infestations from spreading outward and will help to control new outbreaks. By confining the
weeds into areas, they will be more manageable. Keep records of the controls you use and the
results. This will provide analysis of the weed control progress and make any needed modifications
to the specific weed control program.
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 9
5.1 BASIC CULTURAL CONTROL GUIDELINES
The most effective method of control for noxious weeds is to prevent their establishment through
proper land management. Maintain healthy pastures and rangeland and continually monitor your
property for new infestations. New infestations are much more easily controlled than established
infestations.
Disturbed soil and bare ground are prime habitats for weed invasions. A healthy native plant
community will help keep noxious weeds under control by providing competition. Grass seeding
takes place in the fall with follow up over seeding the spring as required to establish a healthy
stand of vegetation. You can either broadcast seed or use a seed drill to plant it (depending on the
area). Riparian areas may require other revegetation efforts.
5.2 BASIC MECHANICAL CONTROL GUIDELEINES
Clean the mowing equipment to remove seeds and vegetative plant parts with a pressure washer
before and after mowing operations. This is especially important if mowing flowering plants. To
limit spreading of weeds, do not clean equipment in un-infested areas, near roadways, or streams.
Some flowering plants and their cut-off flower heads can still develop viable seeds. If the plants
have already bloomed when you cut or pull them, it is important to properly dispose of them. Put
them in a garbage bag, make sure bags are securely closed, and send them to a landfill.
Generally, it is okay to mow one week after spraying. Mowing should not be done immediately
following applications to allow the sprayed plants time to absorb the herbicide into their systems
5.3 BASIC CHEMICAL CONTROL GUIDELINES
The first rule of herbicide use is to read the label before using the product and follow all directions
and precautions. The label is the law. Seek assistance before purchasing or using an herbicide if
not sure of the use or purpose of the product. Chemicals are powerful tools that should be used
judiciously. Follow all instructions (application rates, proper safety equipment, appropriate
weather conditions, etc.) as directed on the herbicide's label. Safety precaution may safety glasses,
rubber gloves, long-sleeved shirts, long pants, high -top shoes, and socks are common sense
precautions which all applicators should take. An additional precaution includes the use a
respirator to protect sensitive mucus membranes in nose and throat. Follow proper clean-up and
disposal procedures for the equipment and containers. All directions for use are dictated on the
herbicide's label.
Care must be taken to avoid spraying herbicides near water unless they are specifically labeled for
aquatic use. An aquatic -approved herbicide is required when applications will be made over water
or encounter surface water. An aquatic -safe herbicide is a great quality to have in an herbicide
when applying near any kind of stream or river (riparian areas) or drainages.
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 10
Broadleaf selective herbicides (such as 2,4-D) can either be applied by spot spraying individual
plants or by a continuous spray over an entire area. A non -selective herbicide (such as glyphosate)
should only be used if spot spraying. Avoid using soil -active herbicides (such as dicamba) near
windbreak plants or other desirable woody vegetation. Plant injury or death can occur. Also, do
not allow any herbicide to drift onto desirable vegetation for the same reasons. From time to time,
if possible, alternate the herbicide (active ingredient) applied to the noxious weed infestation. This
will help to prevent the weeds from developing chemical resistance.
For the first few years, spray twice per year: once in the spring and once in the fall. When you
have achieved a more acceptable level of control, you can change to spraying only once in the fall.
If it becomes economically unfeasible for you to spray twice a year, you may choose to only spray
in the fall. From time to time, if possible, alternate the herbicide (active ingredient) you use. This
will help to prevent the weeds from developing chemical resistance.
When using a foliar spray, be sure to get good spray coverage of the plants. All the leaves should
have herbicide contact. The sprayed plants should be obviously wet, but not dripping with
herbicide. If a surfactant is indicated the herbicide label, it should be mixed as directed with the
herbicide. Surfactants help herbicides do their job by reducing the surface tension of liquids
between two liquids or a solid leaf. You may also choose to use an herbicide tracer dye so that you
can easily see the areas you have treated. Calibrate the sprayer to the recommended application
rate and keep records of the work performed.
5.3.1 SPRAY DRIFT MANAGEMENT
Avoiding spray drift at the application site is the responsibility of the applicator. The interaction
of many equipment and weather -related factors determine the potential for spray drift. The
applicator and grower are responsible for considering all these factors when making decisions. The
following drift management requirements must be followed to avoid off -target drift movement
from aerial applications to agricultural field crops. These requirements do not apply to forestry
applications, public health uses, or to applications using dry formulations.
1. The distance of the outermost nozzles on the boom must not exceed 3/4 the length of the
wingspan or rotor.
2. Nozzles must always point backwards parallel with the airstream and never be pointed
downwards more than 45 degrees.
AERIAL DRIFT REDUCTION INFORMATION
INFORMATION ON DROPLET SIZE
The most effective way to reduce drift potential is to apply large droplets. The best drift
management strategy is to apply the largest droplets that provide sufficient coverage and control.
Applying larger droplets reduces drift potential but will not prevent drift if applications are made
Chavers Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page I i
improperly, or under unfavorable environmental conditions (see "Wind", "Temperature and
Humidity", and "Temperature Inversions").
CONTROLLING DROPLET SIZE
Volume — Use high flow rate nozzles to apply the highest practical spray volume.
Nozzles with higher rated flows produce larger droplets.
Pressure — Do not exceed the nozzle manufacturer's recommended pressures. For many
nozzle types lower pressure produces larger droplets. When higher flow rates are needed,
use higher flow rate nozzles instead of increasing pressure.
Number of Nozzles — Use the minimum number of nozzles that provide uniform
coverage.
Nozzle Orientation — Orienting nozzles so that the spray is released parallel to the
airstream produces larger droplets than other orientations and is the recommended
practice. Significant deflection from horizontal will reduce droplet size and increase drift
potential.
Nozzle Type — Use a nozzle type that is designed for the intended application. With most
nozzle types, narrower spray angles produce larger droplets. Consider using low -drift
nozzles. Solid stream nozzles oriented straight back produce the largest droplets and the
lowest drift.
Boom Length — For some use patterns, reducing the effective boom length to less than
3/4 of the wingspan or rotor length may further reduce drift without reducing swath
width.
Application Height — Applications should not be made at a height greater than 10 feet
above the top of the largest plants unless a greater height is required for aircraft safety.
Making applications at the lowest height that is safe reduces exposure of droplets to
evaporation and wind.
SWATH ADJUSTMENT
When applications are made with a crosswind, the swath will be displaced downwind. Therefore,
on the up and downwind edges of the field, the applicator must compensate for this displacement
by adjusting the path of the aircraft upwind. Swath adjustment distance should increase with
increasing drift potential (higher wind, smaller drops, etc.).
WIND
Drift potential is lowest between wind speeds of 2 —10 mph. However, many factors, including
droplet size and equipment type determine drift potential at any given speed. Application should
be avoided below 2 mph due to variable wind direction and high inversion potential. Do not apply
by air when wind speed is greater than 8 mph. Do not apply by ground when wind speed is
greater than 10 mph.
Chases Mining Resource
Integrated Noxious Weed Management Plan
January 2024
Page 12
Note: Local terrain can influence wind patterns. Every applicator should be familiar with local
wind patterns and how they affect spray drift.
TEMPERATURE AND HUMIDITY
When making applications in low relative humidity, set up equipment to produce larger droplets
to compensate for evaporation. Droplet evaporation is most severe when conditions are both hot
and dry. Do not apply when air temperatures exceed 90°F.
TEMPERATURE INVERSIONS
Do not make applications during a temperature inversion because drift potential is high.
Temperature inversions restrict vertical air mixing, which causes small suspended droplets to
remain in a concentrated cloud. This cloud can move in unpredictable directions due to the light
variable winds common during inversions. Temperature inversions are characterized by increasing
temperatures with altitude and are common on nights with limited cloud cover and light to no
wind. They begin to form as the sun sets and often continue into the morning. Their presence can
be indicated by ground fog; however, if fog is not present, inversions can also be identified by the
movement of smoke from a ground source or an aircraft smoke generator. Smoke that layers and
moves laterally in a concentrated cloud (under low wind conditions) indicates an inversion, while
smoke that moves upward and rapidly dissipates indicates good vertical air mixing.
SENSITIVE AREAS
The pesticide may only be applied when the potential for drift to adjacent sensitive areas (e.g.,
residential areas, bodies of water, known habitat for threatened or endangered species, non -target
crops) is minimal (e.g., when wind is blowing away from the sensitive areas).
CLEANING SPRAY EQUIPMENT
All mixing equipment and air spray equipment should be thoroughly cleaned before and after
mixing and applying. Do not contaminate water by cleaning of equipment or disposal of rinsate.
5.4 BASIC BIOLOGICAL CONTROL GUIDELINES
Biological controls are a good option for larger infestations. Expect to wait a few years for the
insects to establish and achieve optimum results. Once established, biological controls tend to
persist and provide control for many years.
Not all sites are suitable for biological control. Biocontrol agents are affected by the environment
and climatic/cultural conditions may inhibit their efficacy. The use of these insects will also require
some maintenance and considerations for their lifecycle and behavior. For more information,
contact the Palisade Insectary of the Colorado Department of Agriculture.
FIGURES
INTEGRATED NOXIOUS WEED MANAGEMENT PLAN
CHAVERS MINING RESOURCE
12367 COUNTY ROAD 8
FORT LUPTON, WELD COUNTY, COLORADO
APPENDIX A
TARGETED WEED SPECIES - FACT SHEETS
Rangeland -Pasture Recommendations
Scotch thistle Identification and
Management
Scotch thistle (Onopordum acanthiuni) is a non-native biennial forb that
reproduces solely by seed. A biennial is a plant that completes its lifecycle within
two years. During the first year of growth, Scotch thistle appears as a rosette in
spring or fall. During the second year in mid to late spring - the stem bolts,
flowers, sets seed, and the plant dies. A prolific seed producer, Scotch thistle can
produce up to 14,000 seeds per plant. Therefore, the key to managing this plant is
to prevent seed production.
Scotch thistle can grow up to 12 feet tall. Stems are numerous, branched,
and have broad, spiny wings. The leaves are large, green, spiny, and covered
with fine dense hair giving the leaf a woolly appearance. The flowers are violet
to reddish in color, numerous (70-100/plant), and are surrounded by spine -
tipped bracts. You can expect to see flowers from mid -June to September.
Due to the robust, spiny nature of Scotch thistle, this plant can act as a
living barbed wire fence, making areas impassible for wildlife, livestock, and
people. Scotch thistle invades rangeland, overgrazed pastures, roadsides, and
irrigation ditches. It also prefers moist areas adjacent to creeks and rivers.
On the backside of this sheet are Scotch thistle management
recommendations. If you have any questions, please contact the Weld County
Public Works Dept., Weed Division at (970) 304-6496 ext. 3770. Please visit our
website www.weldweeds.org.
Recommended management methods:
Cultural - Establishment of selected, aggressive grasses can be an effective
cultural control of Scotch thistle. Contact your local CSU Extension office or
Natural Resources Conservation Service office for seed mix recommendations.
Good grazing management will stimulate grass growth and keep pastures
healthy. Healthy pastures may be more resistant to Scotch thistle invasion. Bare
spots caused by overgrazing are prime habitat for weed infestations.
Mechanical - Any mechanical or physical method that severs the root below the
soil surface will kill Scotch thistle. Mowing or chopping is most effective when
Scotch thistle plants are at full -bloom. Be sure to properly dispose of the
flowering cut plants, since seeds can mature and become viable after the plant
has been cut down.
Biological - There are no biological control insects available that will control
Scotch thistle.
Herbicides - The following are recommendations for herbicides that can be
applied to range and pasturelands. Always read, understand, and follow label
directions. The herbicide label is the LAW!
Herbicide
Rate
Application
Timing/Comments
2,4-D
Amine
1 qt./acre
or
1 oz/gal
water
Spring/fall
apply
Add
1
qt/
100
when
non-ionic
gal
rosette
outside
water.
surfactant
—
before
temperatures
@
flowering
will
0.32 oz/gal
stalk
exceed
lengthens.
water
85
or
degrees.
DO
NOT
Curtail
1.5 — 2 qts./acre
or
1.5-2.0 oz/gal
water
Spring
Add
1 qt/100
rosette
non-ionic
gal
to
surfactant
water.
pre
-bud
stage and/or
@ 0.32 oz/gal
fall
rosette.
water
or
Clarity
1
or
1.0
qt./acre
oz/gal
water
treatment
Spring
shrubs
Add
water.
a
rosette
or
non-ionic
of
when
— before
rosettes.
outside
surfactant
DO
temperatures
flowering
NOT
@
0.32oz/gal
stalk
apply
lengthens
near
will
or
exceed
water
under
or
and/or
85
1
trees
degrees.
qt/100
late
and/or
gal
fall
Milestone
3 to 5 oz/ acre
seasonally
Apply
bolting
and
year
water
lowland
of
to
or
stage
application.
1
plants
dry
qt/
sites.
100
or
in
to
wetlands
the
the
gal
DO
spring
fall
Add
water.
NOT
and
a
rosette.
non-ionic
and
transitional
rotate
early
It
to
is
a
surfactant
summer
permissible
areas
broadleaf
between
@
at
crop
0.32oz/gal
rosette
to
treat
within
upland
or
1
Impenetrable barrier of
mature Scotch thistle
Rangeland -Pasture Recommendations
Hoary Cress Identification and Management
Hoary Cress (Cardaria draba) is a non-native perennial that spreads by seeds and
aggressive, creeping, roots that vigorously produce new plants. Depending on
conditions, hoary cress grows to a height of 1/2 to 2 feet tall. The first leaves emerge from
a crown and are dull gray -green, oblong and often have a slightly wavy margin.
Subsequent leaves are alternate, have short fine hairs and an irregularly toothed
margin. Only the lower leaves have stems, others are stalk -less and clasp the plant stem
with two ear -like lobes. Flowers are fragrant, numerous, small, white with 4 petals and
grow in compact clusters.
Hoary cress is a member of the Mustard family. In the fall seeds germinate and
rosettes become established. It frequently flowers in April and May and again in the fall
during optimum conditions. Seed production begins about one month later. Hoary
cress produces up to 4800 seeds per plant. Seed viability is up to 3 years. However, the
primary means of spread is the vertical and horizontal root system. Root fragments are
capable of forming new plants. In one year, a single plant, without competition, can
spread vegetatively to cover an area 12 feet in diameter and can produce 450 shoots.
Hoary cress is also known as whitetop Rosette
Hoary cress can be found in disturbed open sites, roadsides, ditches, riparian
areas, grain and vegetable fields. It does especially well in irrigated crops such as alfalfa
and sugar beets. Hoary cress grows well in most soil conditions, including alkaline
soils. However, it does not tolerate shade. Hoary cress displaces native vegetation for
wildlife and livestock forage. It also contains glucosinolates that are toxic to cattle.
Prevention is the most cost reducing and time effective weed management
strategy. Infrequent cultivation can actually facilitate the spread by dispersing root
fragments. Consistent monitoring of your fields is an essential first step.
On the backside of this sheet are hoary cress management recommendations. If
you have any questions, please contact the Weld County Public Works Dept., Weed
Division at (970) 400-3770. Please visit our website at www.weldweeds.org
Recommended management methods:
Cultural - Establishment of selected, aggressive grasses can be an effective cultural
control of hoary cress. Contact your local CSU Extension office or Natural Resources
Conservation Service office for seed mix recommendations. Good grazing management
will stimulate grass growth and keep pastures healthy. Healthy pastures may be more
resistant to hoary cress invasion. Bare spots caused by overgrazing are prime habitat for
weed infestations.
Mechanical - Due to the extensive root system, hand -pulling this plant is not a viable
option. Repeated tillage (every 10 to 14 days) can destroy colonies in 2 to 4 years.
Combining mowing with herbicides will further enhance control of this weed. Apply
herbicides in spring and/or fall, and then mow during the summer months. Mowing
alone is not an effective control option.
Biological No known biological control agents available at this time.
Herbicides - The following are recommendations for herbicides that can be applied to
range and pasturelands. Always read, understand, and follow label directions. The
herbicide label is the LAW!
Herbicide Rate Application Timing/Comments
Escort XP 1 to 2 oz/acre Apply from bud to early bloom stage or at fall rosette. Add a
or non -acidifying non-ionic or MSO surfactant @ 0.32oz/gal water
1.3 grams to 3 gallons of water or 1 qt/100 gal water.
Telar XP 0.5 to 1 oz/acre Apply at prebloom to bloom or at fall rosette stage. Add a non -
or acidifying non-ionic or MSO surfactant @ 0.32oz/gal water or 1
% of a gram to 3 gallons water qt/100 gal water.
Plateau 8 oz./acre Spring apply to rosette stage or at flowering or at fall rosette.
or Add a methylated seed oil surfactant (MSO) @ 0.32 oz/gal
water or 1 qt/100 gal water.
0.25 oz/gal water
Rangeland -Pasture Recommendations
Cheatgrass Identification and Management
Commonly referred to as cheatgrass, (Bromus tectorum) it is also known
as downy brome, downy cheat and bronco grass. It is widely distributed
throughout the United States and has been reported to be the dominant species
on more than 100 million acres of the intermountain west. Cheatgrass is unique
in that it occupies a dual role as a serious weed and important early season
forage. In terms of volume of forage produced and extent of area covered it is the
single most important spring forage. Cheatgrass can maintain dominance for
many years on sites where native vegetation has been eliminated or severely
reduced by grazing, cultivation or fire.
Cheatgrass is a winter annual member of the grass (Poaceae) family. It
reproduces by seed which germinates in the fall, over winters as a seedling and
flowers in the spring. Seed can remain viable in the soil for 2 to 5 years.
Cheatgrass can grow in almost any soil type and readily adapts to varying
precipitation. Cheatgrass can be several inches to more than 18 inches tall. It has
a nodding seed head with many finely hairy drooping spikelets. As it matures
the seed heads and foliage often become reddish and then progress to a light tan.
The mature seeds readily penetrate clothing and are frequently a problem in
dog's ears and noses.
Cheatgrass is found in both disturbed and undisturbed sites. The largest
infestations are usually found in overgrazed range and pasture, abandoned
fields, eroded sites and waste areas. The greatest competitive advantage
following a fire goes to cheatgrass because the native shrubs and perennial
grasses cannot recover as quickly allowing cheatgrass to establish a monoculture.
On the backside of this sheet are cheatgrass management
recommendations. If you have any questions, please contact the Weld County
Public Works Dept., Weed Division at (970) 304-6496 ext. 3770. Please visit our
website at www.weldweeds.org
Recommended management methods:
Cultural - Establishment of selected, aggressive grasses can be an effective
cultural control of cheatgrass. Contact your local CSU Extension office or Natural
Resources Conservation Service office for seed mix recommendations. Good
grazing management will stimulate grass growth and keep pastures healthy.
Healthy pastures may be more resistant to cheatgrass invasion bare spots caused
by overgrazing are prime habitat for weed infestations.
Mechanical - Fire, mowing, grazing, tillage, and inter -seeding competitive
species have all shown promise in reducing cheatgrass populations. Long lasting
control requires a combination of chemical, physical, vegetative suppression and
proper livestock management.
Biological -Biological control is limited. Rabbits and mice will feed extensively
on the seedlings as will migratory grasshoppers. But there is no long-term
biocontrol agent available.
Herbicides - The following are recommendations for herbicides that can be
applied to range and pasturelands. Always read, understand, and follow label
directions. The herbicide label is the LAW!
Herbicide __
-Rate
_ Application_Timing/Comments
Plateau
4 to 6 oz/acre
Fall application as a pre -emergent prior to a hard freeze is
optimum for control. Use a methylated seed oil surfactant - -
(MSO) at 0.32 oz/gal water or 1 qt/100 gal water. The 12 oz rate
of Plateau may cause injury to some cool season grasses.
Panoramic 2 SL
4 - 8 Oz/Acre
Apply pre- or post emergent in late summer or early fall. Use a
MSO surfactant at 0.32 oz/gal or 1 qt/100ga1 water. The 12 oz
rate of Panoramic 2SL may cause injury to some cool season
grasses.
Laramie 25DF
4 oz/acre
An early post -emergent option. Must be activated with rainfall
and applied when soil temps are cool. Moisture must arrive
within 2-3 weeks of application. Add a non-ionic or MSO
surfactant @ 0.32oz/gal water or 1 qt/100 gal water.
Glyphosate
*Non -selective
herbicide. 41%
concentrate min.
16 to 24 oz/acre
Apply in fall or early spring.
Add a non-ionic surfactant @ 0.32oz/gal water or 1 qt/100 gal
water. Use caution when applying near grasses or other
desirable vegetation
Rejuvra
5 oz/acre
A pre -emergent chemical — it will not kill established growing
plants. Can be tank mixed with Glyphosate, Panoramic 2SL or
Plateau. Apply in August to March. Add a non-ionic surfactant
@ 0.32oz/gal water or 1 qt/100 gal water.
Prowl H2O
Short Term 2-4 months:
2.1 quarts/acre
Long Term 6-8 months:
4.2 quarts/acre
A pre -emergent chemical —it will not kill established growing
plants. Cm be tank mixed with Glyphosate, Panoramic 2SL or
Plateau. Spray solution may stain porous surfaces Length of
control is dependent on weather conditions. Not labeled for use
in range and pasture settings.
Rangeland -Pasture Recommendations
Field Bindweed Identification and
Management
Field bindweed (Convolvulus arvensis) is a non-native deep-rooted
perennial that reproduces from seed and creeping, horizontal roots (rhizomes).
Field bindweed stems are prostrate (grows low to the ground) and twining, and
grow up to 6 feet long. Leaves are distinguishable by their arrowhead shape. The
flowers are bell or trumpet -shaped, white to pink in color, and are about 1 inch
long. Field bindweed seeds can remain viable in the soil for up to 40 years.
Field bindweed emerges from its root system in the spring. Flowering
occurs from June to September and until the first fall frost. The number of seeds
produced per plant ranges from 25 to 300 and seed production is variable
depending on environmental conditions. Field bindweed is an extremely difficult
noxious weed to control because, in part, of its root that may go 20 feet deep into
the soil, and which repeatedly gives rise to numerous long rhizomes.
Field bindweed is a problem throughout Colorado. It is one of the most
competitive perennial weeds. It is widespread in cultivated areas, pastures,
lawns, gardens, roadsides, and waste areas from 4,000 to 8,000 feet in elevation.
To successfully manage field bindweed, containment and persistence in
controlling existing stands are necessary to exhaust the root system and deplete
the soil seed bank. This weed needs to be continually stressed, forcing it to
exhaust root nutrient stores and eventually die. Of all control methods,
prevention is most important. Maintain healthy pastures and rangeland and
continually monitor your property for new infestations. A healthy cover of
desirable perennial plants will assist in discouraging field bindweed
establishment.
On the backside of this sheet are field bindweed management
recommendations. If you have any questions or would like more information,
please contact the Weld County Public Works Department, Weed Division at
(970) 304-6496 ext 3770. Please visit our website www.weldweeds.org.
Recommended management methods:
Cultural - Establishment of selected, aggressive grasses can be an effective
cultural control of field bindweed. Contact your local CSU Extension office or
Natural Resources Conservation Service office for seed mix recommendations.
Good grazing management will stimulate grass growth and keep pastures
healthy. Healthy pastures may be more resistant to field bindweed invasion. Bare
spots caused by overgrazing are prime habitat for weed infestations.
Mechanical - Cutting, mowing, or pulling has a negligible effect unless the
plants are cut below the surface in the early seedling stage. Well -established
populations have a large seed bank in the soil that can remain viable for over 40
y
ears.
Biological - The bindweed gall mite, Aceria mahlerbae, has proven to be effective
in reducing field bindweed infestations. Biocontrol agents can be obtained at no
charge from the Colorado Department of Agriculture's Insectary. Please call 970-
464-7916 or go to www.palisadeinsectary.com for more information.
Herbicides - The following are recommendations for herbicides that can be
applied to range and pasturelands. Optimum results occur when the plants have
recently received moisture and are actively growing. Always read, understand,
and follow label directions. The herbicide label is the LAW!
Herbicide
Application
Rate
Timing/Comments
Clarity
Amine
+ 2,4-D
1
or
1
product
qt./acre
oz/gal
for
water
each
for
product
each
Spring-
DO
degrees.
DO
permeability
Add
1
qt/100
NOT
NOT
non-ionic
at
gal
apply
apply
or
just
or
water.
surfactant
after
when
near
where
or
outside
full
water
under
-bloom
@
level
0.32
and/or
is
oz/gal
or
high.
where
water
fall.
will
exceed
have
85
rapid
temperatures
trees
soils
or
*Tordon
2,4-D
*this
Restricted
Pesticide*
Amine
is
a
22K +
Use
1
or
loz/gal
qt./acre
for
water
each
for
each
product
product
Spring-
DO
degrees.
DO
permeability
Add
1
qt/100
NOT
NOT
non-ionic
at
gal
apply
apply
or
just
or
water.
surfactant
after
when
near
where
full
outside
or
water
under
-bloom
@
temperatures
trees
level
0.32
and/or
or
is
oz/gal
high.
where
water
fall.
will
soils
exceed
or
85
have rapid
*Roundup
*Non
herbicide.
Will
vegetation.*
-selective
kill
all
Ultra
4
or
4
—5 qts./acre
—5 oz/gal
water
Apply
Add
water.
Use
vegetation.
a
caution
at
non-ionic
full
Roundup
-bloom
when
surfactant
applying
and/or
will
fall.
@ 0.32oz/gal
near
possibly
grasses
kill
water
or other
surrounding
or
desirable
1 qt/100
vegetation.
gal
•1�. .. - : 3 ♦!'{i, l'1 �'_
• . ♦ ' ';M Y;1, .17• �;�.IY )- • • . ;•
Wit
J%.. i .'....• • •• - . • - '.
_•r.=.' •. j .. f !'.l( Y.. ... •. i •
2 •_ = • • -� ♦ - '• • ' . a •
i •� w
• r r•
.t „
f 1. •-
r , a
• e4
APPENDIX B
GENERAL CHEMICAL/HERBICIDE SELECTION SHEETS
Chemical Weed
Matrix
March 2019
Canada Thistle-
Creeping
perennial; 6-10
inches to bud or
fall
Musk Thistle;
Scotch Thistle
Bull Thistle -
Biennial; rosette
stage or fall
Russian
Knapweed -
Creeping
perennial; bud to
early flower or
fall
Diffuse
Knapweed;
Spotted
Knapweed -
Biennial or simple
perennial; rosette
stage or fall
Fie d Bindweed
- Creeping
perennial; at
full bloom or
fall
1?quart/acre,
PLUS 2,4-D @ 1
quart/acre
with NIS
Pepperweed -
Creeping
perennial;
bolting to bud
maybe bloom
Leafy Spurge -
Creeping
perennial;
spring true
flowers or fall**
Absnith
Wormwood -
Perennial; 12
inches to
flowering or
fall
Mullein -
Biennial;
Rosette to
pre -bud or
fall
Yellow Toadflax;
Dalmatian
Toadflax -
Creeping
perennial; bud to
early flowering or
fall
Cheatgrass
(Downy Brome)
annual; early
germination,
maybe spring
Tordon 22K (Picloram)- RU No
trees or water; Graze- 14D
wait
Milestone (aminopyralid) -
Some trees; To waters edge:
No irrigation; No Graze wait
Curtail (Clopyralid .2,4-D)
Some trees; No water; Graze -
14Dwait
Transline (Clopralid) - Most
trees; No water; Graze - no
wait.
22 4-D -:Careful trees; Maybe,
water = formulation; Graze -
7D wait;
Clarity/Banvel (Dicamba) - No
trees or water; Graze - 21D
wait
Dicamba .2,4-D - Graze -7D;
No water or trees
Glyphosate (40-50%) - Trees
okay; Yes water depending on
label; Non -selective
Panoramic (Imazapic) -'Some
trees; waters edge ok; No
irrigation; Graze - no wait
Telar (Chlorsulfuron) - Some
trees; waters edge ok; Graze -
no wait
Escort XP (Metsulfuron) -
Some trees; waters edge ok;
No irrigation; Graze - no wait
Vista XRT (Fluroxypyr) - Some
trees, some water; Graze - no
wait
1 quart/acre with
NIS
5-7 oz/acre with
NIS
2 -3 quarts/acre
with NIS
0.66 - 1.33
pints/acre with
NIS
weals alone
weak alone
1 quart each/acre
with NIS
2 quarts/acre
1-2.6 oz/acre
with NIS
1.5 to 2 oz/acre
with NIS
4-6 oz Vista and 4-
7 oz Milestone
1 quart/acre
with NIS
3-5 oz/acre with
NIS
1.5-2
quarts/acre with
NIS
0.33 - 1 pints/
acre with NIS
1 quart/acre
with NIS
1 quart/acre
with NIS
1.5 quarts/acre
8 -10 oz/acre'
withMSO
1 oz/acre with
NIS
1 to 2 oz/acre
with NIS
4-6 oz Vista and
4-7 oz Milestone
1 quart/acre: 1 quart/acre with
with NIS NIS
4 -6 oz/acre with 5-7 oz/acre with
NIS NIS
3 quarts/acre 2 quarts/acre
with NIS with NIS
0.66 - 1:33
1 - 1.33 pints pints/acre with
/acre with NIS NIS
weals alone weals alone
weak alone weak alone
1 quart
each/acre with 1 quart each/acre
NIS with NIS
NA 1.5 quarts/acre
8 -10 oz/acre
with MSO
NA
1.5 to 2 oz/acre
with NIS
(suppression); NA
4-6 oz Vista and
4-7 oz Milestone
4-6 oz Vista and 4-
7 oz Milestone
weak alone
weals alone
1 quart
each/acre with
NIS
4-5
qurts/acre
NA
6 oz Vista and
1/2 pint
Tordon
NA
3 quarts/acre
with NIS`
4 quarts/acre
8 oz/acrewith
MSO
1 oz/acre with
NIS
1 to2'oz/acre
with NIS
4-6 oz Vista and
3.3 oz Opensight
1 quart/acre
with NIS
NA
2 -3 quarts/acre
with NIS
weal, alone
1 quart
each/acre with
NIS
3.3 quarts/acre;
partial control
10 oz/acre with
MSO
NA
23 oz /acre with
MSO
1 pint/acre
with NIS
7 oz/acre
with NIS
2 quarts/
acre with NIS
NA
weak alone
weak alone
1 quart
each/acre
with NIS
NA
1-1.5pints
/acre vv/NIS
7 oz/acre
with NIS
NA
1 quart/acre
w/NIS
1 quart/acre with
NiS
NA
NA
2-3 quarts/
acre 2 quarts/acre
10 oz/acre with
NA MSO
Y chow: 125
oz/acre with NIS;
1-2.6 oz/acre Dalmatian 2 - 2.6
with NIS oz/acre with NIS
1 to 2 1.5 to 2 oz/acre
oz/acre with with NIS
NIS (suppression)
6 oz Vista
and 1/2 pint
Tordon NA
4-5 quarts/acre
6-8 oz/acre'with
NIS
NA
Herbicide Options Around Various Water Situations ** The label is the law. Read it for more details.
Outside
banks of Top of Inside banks To waters edge To'seasonally Drainage or
irrigation ditch of Irrigation of wetlands, dry wetladns, non -irrigation
ditch bank ditch rivers and lakes marshes , bogs In rivers In lakes ditch banks Notes
Aquatic 2,4-D amine; EPA #:
34707-120 & 5905-549 &
11773-2
Glyphosate; (Rodeo - EPA 0:
62719-324)
Arsenal (EPA #: 241-346)
Garlon 3A (EPA#: 62719-
37); Vastlan (EPA#: 62719-
687)
Clearcast (EPA #: 241-437)
Banvel (EPA#: 66330-276)
Milestone (EPA#: 62719-
519)
Telar
Triclopyr 3 (EPA #: 81927-
13)
Yes; up to 2 foot
Yes - do not spray overspray into water
Yes Yes water surface allowed
Yes Yes Yes Yes
Yes,
w/caution
Yes, w/caution possible 120
possible 120 day Yes, w/ 120 day
day restriction restriction restriction Yes
Yes,
w/caution
Yes, w/caution possible 120
possible 120 day Yes, w/ 120 day Yes, minimize
day restriction restriction restriction overspray
Yes Yes Yes
Maybe Maybe No
Maybe Maybe No
No No No
No No No
Yes
No
Yes, take precautions
to avoid drift
No
Yes, minimize
overspray
Yes; except for
small canals with
Yes Yes Yes less than 10 CFS Max. treatments/year2
Yes Yes Yes
non -selective product
Yes Maybe Yes Yes that will move
Yes
Can contaminate
No No Yes ground water
Limited Species of
Yes Yes Yes Yes Control
Do not contaminate
No No No No water
Do not apply directly
Yes No No Yes to water
Do not apply directly
Yes No No No to water
Yes No Yes Yes
Range and Pasture Chemicals for Grasses
Grazing Haying Reseeding
Trade Name Chemical Trees Water Restrictions Restrictions Restrictions Newly Seeded Notes
Tordon 22K
Well est./ 2nd root -
Picloram No No Dairy = 2wks 2 weeks 3-6 months 60 days max. rate is 2 qt/acre/yr. License required.
Milestone Aminopyralid Some edge ok none
ForeFront HL Aminopyralid + 2,4-D Some edge ok Dairy = 7 D
none if kept on property
not for sale for 18 Well est./ 2nd root
months 3-6 months 60 days 14 days to work..max. rate is 7oz/acre/yr
Well est./ 2nd root -
7 days 3-6 months 60 days max rate is 84 oz/acre/yr
none if kept on property - previous growing
Aminopyralid + not for sale for 18 season and fully Do not use on Timothy or other cool season grasses for
Opensight metsulfuron Careful edge ok none months 3-6 months tillered hay.
max rate is 4 qts/acre/year - Do not use clippings, hay or
Curtail Clopyralid + 2,4-D Careful No Dairy = 14 D 7 days 3 -6 -months Well est./ 2nd root manure for mulch for 18 months
max rate is 1.33 pints/acre/yr - Do not use clippings, hay
Transline Clopyralid Ok No none none 3-6 months Well est./ 2nd root or manure for mulch for 18 months
Panormaic 2SL Imazapic Some edge ok none
Telar XP Chlorsulfuron Some edge ok none
Escort XP Metsulfuron Some edge ok none
2,4-D
Clarity
2,4-D
Dicamba
Maybe Maybe 7 days
No No Dairy = 21 D
no. 3-6 months well est....5 leaf stage shows symptons slowly; max rate = 12 oz/acre
Well est./ 2nd root — up to 3 weeks to show signs of treatment. At 1 1/3 for no
none 1-6 months 60 days restrictions. Max rate is 3 oz/acre/yr
up to 4 weeks to show signs of treatment max rate is 1 2/3
Well est...3-4 leaf oz/acre/yr for no restrictions. At 3 1/3 oz/acre/yr 3 day
none 1-4 months stage interval
Well est./ 2nd root --
30 days 3 months 60 days check for aquatic label max rate is 2 qts/acre/season
51 days 90 days Exceeds 3 leaf stage also sold as Banvel max. rate is 64 oz (4 pints)/acre/yr
Outlaw,
Weedmaster,
Rangestar, Brash Dicamba + 2,4-D No No Dairy = 7 D 37 days 3 weeks and up 30-60 days max. rate is 8 pints/acre/yr
near 8 wks after
Glyphomax Glyphosate (41%) Ok edge application 8 wks after application 7 days not recommended non -selective 7 or more days to show symptoms
2 pounds of 2,4-D/acre/application. Minimum 21 days
2,4-D, Fluroxypyr and Not indicated on the between applications. Limited to 2 applications/year. Don't
E2 Dicamba No No Dairy - 7 D 7 days 3 weeks and up label use on buffalograss.
Not indicated on the Remove meat animals eating treated forage 2 days before
Vista XRT Fluroxypyr Some some none 7 days 4 months label slaughter. Maximum use 23 oz/acre
Well established. 1-2
Esplanade 200SC Indaziflam yes No Not Allowed Not Allowed 8 months min. years Do not use more than 10 oz/ 12 calendar months
`* Read the label. It is the law and may change from year to year. March 19, 2019
AD N R
COLORADO
Division of Reclamation,
Mining and Safety
Department of Natural Resources
1313 Sherman St. Room 215
Denver, CO 80203
December 16, 2016
Weld County Commissioners
915 10th St
Greeley, CO 80631
RE: Notice of 112 Construction Materials Reclamation Permit Amendment Application Consideration
Asphalt Specialties Co., Inc., Chavers Mining Resource, Permit No. M-2015-030, AM0S
Please be advised that on December 16, 2016, Asphalt Specialties Co., Inc., whose address and telephone number are
10100 Dallas St., Henderson, CO 80640; (303)-289-8555, filed an Amendment application to M-2015-030, Chavers
Mining Resource, which is located at or near Section 18, Township 1N, Range 66W, 6th Principle Meridian, in Weld
County. The application decision is scheduled for March 16, 2017.
A copy of the application is available for review, at the Weld County Clerk & Recorder's office and at the office of
the Division of Reclamation, Mining and Safety, Room 215, 1313 Sherman Street, Denver, Colorado 80203. The
application, as well as all other permit documents, can be found at http://drmsweblink.state.co.us/ by searching
M2015030 in the "Permit No" field. A user guide is available to help first time users of the imaged document
system and can be viewed at http://mining.state.co.us/SiteCollectionDocuments/Laserfische%20User%20Guide.pdf.
If you desire to make comments or objections of the mine plan and/or the reclamation plan, they must be submitted
within twenty (20) days of the date of the last newspaper public notice to be considered in the application review
process by the Division. You should contact the applicant for the newspaper publication date. If we do not receive
your comments or any objection by the end of the public comment period, the Office will assume you have no objection
or comment to the proposed activity.
If you have any questions, please contact me.
Sincerely,
Eric C. Scott
Environmental Protection Specialist
WAR -08
Public RA,
Ol/fs1/1'-
RECEIVED
DEC 2 1 2016
WELD COUNTY
COMMISSIONERS
Cu. R.-O,AM l'VP)
PW C RRICH/UMIC.K)
la/Rt/l(o
1313 Sherman St. Room 215 Denver, CO 80203 P (303) 866-3567 F
John W. Hicken(ooper, Governor I Robert W. Randall, Executive Director I Virginia Brannon, Director
Zb I'7 - aD 55
Hello