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OGILW RIVER FARM, LLC IS THE SURFACE AND
SUBSURFACE OWNER WITHIN THE PERMIT AREA.
PMITAREA = 1,81 AC
MERINING AREA = 44.04 AC
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Exhibit Cz - Mining Plan Map
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EXHIBIT D
Mining Plan
Mining Limits
Ogilvy River Farm, LLC proposes to mine in the land located in the Southeast 1/2 of the
Southeast 1/4 of Section 5, Township 5 North, Range 64 West of the 6th Principal Meridian and
the Northeast 1/4 of the Northeast 1/4 of Section 8, Township 5 North, Range 64 West of the 6th
Principal Meridian, in Weld County, Colorado.
The proposed mining site is located approximately 1,500 feet south of WCR 601/2, is adjacent to
WCR 53 on the side, and is adjacent to the South Platte River on the south side of the site.
WCR 53 is immediately adjacent to the east side of the permit boundary and the South Platte
River is immediately adjacent to the south side of the permit boundary. Access to the site will be
located at the east side of the permit boundary off of WCR 53. The dominant land use
surrounding the property is agricultural and industrial.
The permit boundary will encompass approximately 71.91 acres which will all be affected
acreage, and approximately 45.06 acres being mined. The remaining area will consist of access
roads, and disturbed/undisturbed land. The following table depicts the different affected
acreage:
Affected
Acreage
Mining
Area
(acres)
Plan
Mined
Area
44.04
Access
Roads
2.41
Disturbed
Land
Adjacent
to
Mining
Slopes
9.11
Undisturbed
Land
16.35
TOTAL
71.91
Various setbacks from adjacent roads, adjacent structures, and oil and gas infrastructure will be
maintained as mining occurs. All setbacks specified in the surface use agreements with the
oil/gas companies will be followed. The final executed agreements are expected to be obtained
in the near future and will be forwarded to the Division when they are available. A minimum 200 -
foot setback from any existing oil/gas facility will be maintained until that time. See Exhibit C,
Mining Plan Map, and the Slope Stability Report for the mining limit configuration and
information on setbacks and their locations. The abandoned wells would be cutoff after mining
has reached the bedrock surface or the reclaimed slope surface where a new cap and any
additional concrete for the existing plug would be needed. Petroleum Development Corporation
(PDC) is the leaseholder and operator of the existing abandoned wells. Discussions with PDC
have indicated they would cut down the existing casings as mining occurs. We have also
worked with McCarty Engineering, LLC to provide this service at other mining permit locations
for other operators. If PDC does not want to perform this work then McCarty Engineering, LLC
J&T Consulting, Inc.
V
Ogilvy River Farm, LLC
Ogilvy River Farm Pit
DRMS 112 Permit Application
would be contacted to do it. They are licensed and bonded to obtain approvals from the
COGCC to do these types of re -plug services on abandoned oil and gas wells.
Products
Sand and gravel will be the primary product produced from the Ogilvy River Farm Pit. The
principal intended use for the sand and gravel is for road base and construction aggregates.
Subsurface drilling and testing have verified that the Ogilvy River Farm Pit property contains a
significant commercial deposit of sand and gravel. The depth of interbedded sandy clays at the
surface range from 1 to 11 feet. The thickness of the aggregate material ranges from 46 to 81.5
feet where bedrock contact occurs.
Mining Methods
The deposit will be dry mined after a slurry wall is constructed around the perimeter of the
mining area. Mining will not expose groundwater prior to the slurry wall being constructed.
Design specifications for the slurry wall and quality control procedures used during construction
will ensure that the reclaimed reservoir meets State Engineer's Office (SEO) performance
standards. Dewatering trenches will be excavated around the perimeter of the mining area prior
to mining operations commencing. The depth of the ditches will vary as the mining progresses
deeper into the alluvium in order to maintain the groundwater level below the bottom of the
active mining surface, and therefore minimize the exposed groundwater surface area. The
dewatering ditches will flow to a collection pond, from which the water will be pumped and
discharged where it will reach the South Platte River.
The equipment and facilities may include, but are not limited to the following:
Scaling Equipment
A scale house and scale will be used to weigh trucks and product leaving the pit. The
dimensions of the scale house are 40' x 12' and the scale will be 70' by 10'. The scale
house will be founded on typical trailer type jacks and tiedowns on top of concrete pads with
minimal rebar to provide reinforcement. The scale will also be founded on concrete pads
with reinforcement where load cells are located for the scale. These foundations would be
removed once the pit is fully mined.
Processing Equipment
Screens, wash plant, crusher, conveyors, stackers, and other miscellaneous processing
equipment. All processing equipment will be mobile and temporary without fixed
foundations. Washing will occur at the wash plant and excess water from the washing will be
recycled to the wash water ponds within the processing area, there will be a sedimentation
pond that will receive the excess water first and then and overflow from the sedimentation
pond to the clear water pond for re -using the water and pumping back to the wash plant.
Earth Moving Equipment
Dozers, loaders, scrapers, excavators, and compactors will be used for mining and earth
moving operations.
Haul Roads and Access Roads
Haul roads will be graded and constructed using the existing pit run where needed outside
the processing area in order to move material from the mine using haul trucks, loaders, or
scrapers. These roads will be mined and removed as the mining is completed.
' J&T Consulting, Inc.
Ogilvy River Farm, LLC
Ogilvy River Farm Pit
DRMS 112 Permit Application
Access roads to the processing plant will be constructed with aggregates made at the site
where the entrance to the permit boundary is located to the scale house and through the
scaling area until the access reaches the stockpile locations. The roads around the
stockpiles will be constructed from the existing pit run similar to the haul roads.
Miscellaneous Equipment
Dewatering pumps, electrical trailer, generator trailer, small portable generators and
watering trucks will be used as needed.
As mining progresses, topsoil and overburden will be stripped to expose the aggregate product
below. Topsoil will be stripped and salvaged from areas where overburden material will be
stockpiled. All soil and overburden material will be used on -site for reclamation; so long-term
stockpiling of these materials is not anticipated. Overburden stockpiles will be located within the
proposed mining area. See the attached mining plan in Exhibit C for the stockpile locations.
Mining of the aggregate will progress down to the underlying bedrock. Since reclamation will
occur concurrently with mining, it is not anticipated that overburden material will be stockpiled
long-term prior to use in production of road base. During mining, the mining the face will have a
2H:1V slope to bedrock or the bottom of the future reclaimed reservoir. The processed
aggregate material will be temporarily stockpiled near the portable processing plant.
Recommendations for monitoring of slope stability, including, conducting a visual inspection of
the excavated slopes on a weekly basis for the duration of mining, conducting a visual
inspection after a major precipitation event that has saturated the ground using the same
procedures, contacting qualified personnel to evaluate and recommend remediation work to
stabilize the area in the event a visual inspection detects signs of potential slope failure, and if
no visible signs of slope failure are detected during mining, reducing visual inspections to once
every six months after mining completion, or after every major precipitation event.
All local, State, and Federal rules and regulations will be followed for the storage and handling
of any fuel for the facilities.
Topsoil Handling Plan
As stated previously the topsoil will be stripped to expose the aggregate product underlying the
topsoil. The topsoil will be stripped using scrapers and stockpiled in the topsoil stockpile as
depicted in Exhibit C. Topsoil will be stripped and salvaged from areas where overburden
material will be stockpiled. The volume of topsoil is approximately 90,000 cubic yards. The
depth of the topsoil is approximately twelve inches over the majority of the mining area. The
topsoil will be stripped and stockpiled prior to mining operations. The height of the topsoil
stockpile will be approximately 15 feet.
Mine Phasing
Ogilvy River Farm, LLC antici ates minin and reclaimin• 55.56 acres of the 71.91 permit
boundary or t e - - gilvy River arm Pr progressing as siown on the Mining Plan Mapthere ar_i
16.35 acres that will remain undisturbed within the permit boundary. The overall time required to
complete the mining and reclamation is estimated to be 5 years 6 months based on an average
rate of 650,000 tons per year. The initial production is expected to be 300,000 tons per year with
the maximum production expected to be 1,000,000 tons per year. However, it is possible that
la Consulting, Inc.
Ogilvy River Farm. LLC
Ogilvy River Farm Pit
DRMS 112 Permit Application
due to demand fluctuations, mining could progress slower than anticipated and additional time
may be required for mining and reclamation of the site.
The mining will progress beginning at the outer edge where material will be moved toward the
interior such that the mining slope can be established. The mining slope will be established for
the entire perimeter in 3 to 6 feet intervals.
Dewaterinq
Dewatering trenches will be placed along the perimeter of each mining area. The dewatering
trench around the perimeter of the phase being mined will be placed at the toe of the mining
slope. As the phase is mined deeper the dewatering trench will be lowered and moved laterally
along the mining slope toward the center of that phase. Slurry walls are anticipated to be
installed around the perimeter of prior to exposing groundwater and mining will continue to
commence in those phases and it is expected minimal dewatering will be required after the
slurry walls are installed due to the slurry walls cutting off groundwater infiltration into the pit.
Ogilvy River Farm, LLC will have an approved substitute water supply plan and well permit prior
to exposing groundwater. The substitute supply plan will be updated annually to account for
water that is consumed due to exposing groundwater by the mining operation.
Explosives
Explosives will not be used during mining.
-, J&T Consulting, Inc.
Ogilvy River Farm, LLC
Ogilvy River Fara) Pit
DRMS 112 Permit Application
EXHIBIT E
Reclamation Plan
Lined water storage reservoirs will be the final reclaimed use for the Ogilvy River Farm Pit.
Portions of mining area will be reclaimed as "native" areas, which will be re -seeded with native
vegetation. The mining area will be reclaimed as a water storage reservoir. The remaining area
within the proposed permit boundary will consist of reservoir shoreline, unimproved access
roads around the reservoirs. and reclaimed vegetated land.
Final
Land
Use
Reclamation
Plan
(acres)
Area
Reservoir
Water
Surface
36.65
Access
Roads
2.41
Reclaimed
and
Slopes
Vegetated
above
Reservoir
Land
(Disturbed
Water
Surface)
Land
16.50
Undisturbed
Land
16.35
TOTAL
71.91
Water Storage Reservoir
In general, the mining limits will be mined down to the shale/claystone/sandstone bedrock. The
relatively impermeable bedrock will make the bottom of the reservoir. The reservoir will be
separated from the surrounding alluvial aquifer by the slurry wall liner system as detailed in the
cross-section shown on the Reclamation Plan Map. The slurry wall liner will be keyed into the
bedrock material and extend upward through the height of the alluvium to three feet above the
reclaimed normal water surface elevation. Design specifications and quality control procedures
used during the construction of the slurry wall liner and clay liner will ensure that the reservoir
meets the State Engineer's Office (SEO) performance standards for permeability.
All reservoir slopes will be reclaimed to at least 4.5H:1V final grade. Since reclamation will be
concurrent with mining, most soil, overburden, and bedrock material excavated during mining
will be used almost immediately. Scrapers and dozers and compactors will be used to shape the
reclaimed slope material along the reservoir perimeters to achieve the final grade. Upon placing
the backfill material, 95 percent compaction will be achieved to ensure adequate integrity of the
liner, backfilled areas for haul/access roads and recharge pond areas that are not within the
future water storage/reservoir footprint. Final reclamation by capping with topsoil and re -
vegetating above the expected reservoir water level will follow grading operations as well as
backfilled areas that will not be haul/access roads to minimize the amount of disturbance at any
one time.
Recommendations for monitoring of slope stability, including, conducting a visual inspection of
the excavated slopes on a weekly basis for the duration of mining, conducting a visual
inspection after a major precipitation event that has saturated the ground using the same
procedures, contacting qualified personnel to evaluate and recommend remediation work to
stabilize the area in the event a visual inspection detects signs of potential slope failure, and if
no visible signs of slope failure are detected during mining, reducing visual inspections to once
every six months after mining completion, or after every major precipitation event.
J&T Consulting, Inc.
Ogilvy River Farm, LLC
Ogilvy River Farm Pit
DRMS 112 Permit Application
During reclamation activities, inlet and outlet facilities for the reservoir will be designed and
installed once the operational criteria of the proposed reservoir have been identified by an end
e ser.
Reclamation Measures/Materials Handling
Backfilling will be done to provide stabilized shorelines around the reservoir and to minimize
e rosion. The backfill material will consist of gravel, overburden, clay, and topsoil from on -site
materials. There will not be known toxic or hazardous materials in the backfill material.
Additionally, it is not likely that acid forming or toxic materials will be encountered during mining.
The mining will not leave high walls on the property. In addition, there will be no auger holes,
e xcavations, or shafts left on the property. The auger holes for the gravel investigation were
backfilled with native gravel and soil cuttings from the drilling. The auger holes that were not
backfilled were the four monitor wells that were constructed and permitted as permanent
monitoring wells to monitor groundwater at the north, east, west, and south sides of the permit
boundary. Monitor wells will remain on the property so the end user may continue to monitor
levels of the groundwater elevations.
Topsoil will be placed to finalize the grading such that seeding can occur. The topsoil will be
placed at all disturbed areas and on the mining slope to an elevation matching the expected
reservoir water level.
Topsoiling
Approximately the top twelve inches of soil on the property is classified as topsoil. This layer
includes the root zone of grasses and crops, which will be stripped and stockpiled separately.
Topsoil will be re -handled as little as possible and a Technical Revision will be submitted prior to
re -locating topsoil stockpiles. By using concurrent reclamation techniques, the topsoil is not
expected to remain in stockpiles for more than one to five years. If the stockpile remains more
than one growing season, it will be seeded with a fast-growing vegetative cover to prevent
e rosion. All topsoil will be retained on -site to reclaim the reservoir shoreline, and other areas
disturbed by mining activities. Where required, topsoil will be replaced to a depth of twelve
inches. Prior to placing topsoil uneven areas and low spots will be graded to subgrade
e levation, in addition debris. roots, branches, stones, in excess of 2 inch in size will be removed.
Scarify surface to depth of 8 inches where topsoil is to be placed for a roughened condition to
assist in eliminating erosion. Scarify/cultivate in areas where equipment used for hauling and
spreading topsoil has compacted subsoil. Place topsoil during dry weather and on dry unfrozen
subgrade. Remove vegetable matter and foreign non -organic material from topsoil while
spreading. Grade topsoil to eliminate rough, low or soft areas.
Revegetation
As mining operations are completed. areas for reclamation will be graded and shaped for
revegetation. Runoff or excess water from adjacent areas will not be allowed to flow over slopes
being graded and seeded. If needed, berms or channels will be constructed to divert excess
water and convey it in a safe and non -erosive manner.
For disturbed areas, the reclamation plan includes re -vegetating with appropriate seed mixes to
minimize erosion and re-establish natural terrain. A proper seedbed is firm and free of
competing vegetation. Correct firmness is when an adult footprint is only slightly visible on the
prepared bed prior to the seeding operation. The seedbed can be firmed, if needed, by pulling a
commercial or homemade packer or roller. A firm seedbed is essential for proper seeding depth
onsniting, Inc.
Ogilvy River Farm, LLC
Ogilvy River Farm Pit
DRMS 112 Permit Application
prior to using the mechanical seeder or broadcasting seed. Apply seed evenly in two
intersecting directions. Rake in lightly. Apply seed at the vendor's recommended bulk seed
rate/acre according to the quantity of PLS contained in their bulk seed to achieve the specified
PLS/acre rate utilizing a mechanical seeder. Where access is limited and seed is applied by
hand broadcasting, apply the seed mix at twice the PLS rate per acre and rake in once
broadcasting in completed. Do not seed areas in excess of that which can be mulched on same
day. Do not sow immediately following rain, when ground is too dry, or when winds are over 10
mph. Immediately following seeding, apply mulch to thickness of 1/4 inch.
The seed mixture below was selected as recommended by the DRMS for this climate zone
(Dryland Quick Establishment, elevation less than 8,000 feet). Reservoir side slopes below the
anticipated reservoir water level will not be seeded. The proposed seed mix is shown in the
following table.
Reclamation and Temporary Stockpile Seed Mix
Seed
Mix
Species
Scientific Name
*
Application Rate
(#PLS/acre)
Grasses
Intermediate Wheatgrass
Thinopyrum intermedium
2.50
Slender Wheatgrass
Elymus trachycaulus,
2.00
Pubescent Wheatgrass
Thinopyrum intermedium
3.00
Russian Wildrye
Psathyrostachys juncea
3.00
Western Wheatgrass
Pascoprum smithii
2.00
Sand Dropseed
Sporobolus cryptandrus
0.25
"Application rate is for drilling the seed. If seed is to be broadcast, the application rate will
be doubled.
The seed mix for final reclamation as described above does not require fertilizer per the
information provided by the DRMS. The seeded areas will be covered with dead crop litter from
sorghum or milo crop forage, or with straw mulch at a rate of 2,000 pounds per acre. Ideal
seeding dates for Colorado are November 1 to May 1, when the soil is not frozen. Grasses
should be seeded when soil moisture and temperature are optimum for germination. Grasses
are designated either "cool" or "warm" season based on their growth cycle. Cool -season
grasses can be planted when temperatures are cooler and day lengths are short. Warm -season
grasses need warmer temperatures and longer day lengths to grow. Refer to Weld County's
seeding recommendations as a resource for time frames outside of the ideal seeding times at
www.weld.gov/Government/Departments/Public-Works/Weed-Management/Controlling-
Weeds/Reseeding.
If a significant invasion of noxious weeds occurs after seeding, the weeds will be mowed before
they can go to seed. The areas will be mowed periodically for additional control as needed.
Mechanical control will be used as a first priority. Chemical methods will only be used if no other
alternative produces acceptable results. See Exhibit J for specifics of the weed control plan.
For temporary earthen stockpiles, the reclamation plan includes re -vegetating with appropriate
seed mixes to minimize erosion and establish more rapidly to stabilize the stockpiles. If a
J&T Consulting, Inc.
Ogilvy River Farm, LLC
Ogilvy River Farm Pit
DRMS 112 Permit Application
temporary earthen stockpile remains more than one growing season, it will be seeded with the
seed mix above to prevent erosion.
Water — General Requirement
To minimize the effect on the prevailing hydrologic balance, Ogilvy River Farm, LLC will:
a. Comply with all applicable Colorado water laws.
b. Comply with all applicable Federal and State water quality laws and regulations.
c. Comply with all Federal and State requirements for dredge and fill.
d. Re -grade and backfill all sediment and siltation structures after mining is completed.
e. Monitor groundwater levels adjacent to the site and mitigate any damage to adjacent
wells that dewatering activities may have. (See Exhibit G)
Groundwater — Specific Requirements
The operation will not affect groundwater quality on or off the site. The operation will comply
with State groundwater quality standards.
The mining and reclamation may affect the groundwater table surrounding the mine site. The
proposed mitigation efforts to minimize these impacts are ditches in necessary areas to
maintain groundwater levels during the mining, and a perimeter drain if needed to convey
groundwater around the lined reservoir after the pit side liner is installed. A ground water model
by McGrane Water Engineering, LLC has also been provided and the results indicate that water
levels will be affected by +1-1 to 3 ft and the wells within the predicted water level change are in
the mounded area so the overall impact of the slurry wall and clay liner will be insignificant and
not noticeable because the depth to groundwater is greater than 30 feet at those well locations.
Ogilvy River Farm, LLC proposes that they monitor groundwater levels through both interior
(within phases of the mining) and exterior (outside the slurry wall lining) monitoring wells that
they have installed, or have access to before, during, and after the mining and reclamation is
complete so that impacts to the groundwater table, from this mining operation, can be identified
and addressed. It is the intent of Ogilvy River Farm, LLC to operate responsibly and to mitigate
any damage to wells that is directly attributable to the mining and reclamation of this site.
Reclamation — Approximate Time Table
The initial proposed rate of production for the mine is 300,000 tons per year and the maximum
proposed rate of production for the mine is 1,000,000 tons per year. The total time frame to
mine all phases assuming an average production rate of 650,000 tons per year is approximately
5 years and 6 months. The following table shows the approximate time frame to finish each
phase of mining assuming an average production rate of 650,000 tons per year:
Acreage
Time Frame to Complete and
Reclaim Phase 1a and Phase 1
71.91 acres 5 years and 6 months
The assumed annual production rate is 300,000 tons initially to 1,000,000 tons maximum for
processed material leaving the mine each year. The size and area of reclamation varies but
generally consists of the outside mining slope being reclaimed at a 4.5H:1V slope with the
addition of clay, overburden, topsoil, and revegetation. For more information on sequencing and
size of the reclamation activities refer to Exhibit L financial warranty calculations.
41
l J&T Consulting, Inc.
Ogilvy River Farm, LLC
Ogilvy River Farm Pit
DRMS 112 Permit Application
Reclamation Plan Map, 92620244'.15'26 PM
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SC.,, TOPSOIL SEE. AREAS
GRAVEL ACCESS ROADS
NOTE:
ALL DISTURBED AREAS OUTSIDE OF THE WATER SURFACE WILL BE
SEEDED AND MULCHED, WITH THE EXCEPTION OF THE ACCESS
ROAD, WHICH WILL BE GRAVEL SURFACED.
RECLAIMED AREA TABULATION:
WATER SURFACE ;2'16
36.65 AC
GRAVEL ACCESS ROAD = 2.41 AC
DISTURBED ARA: SCARIFY. TOPSOIL, SEED AREA = 16.50 AC
UNDISTURBED AREAS = 18.35 AC
TOTAL AREA = 71.81 AC
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