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area(into unexcavated alluvium)will be a permanent part of final reclamation. Since mining will be executed as
<br /> sidehill cuts and will slope down into the hillside,contain runoff contacting exposed bare soil or raw materials plant
<br /> and work areas and stockpiles as much as possible to infiltrate, rather than discharge overland or in outfalls or
<br /> evaporate.
<br /> INTERNAL SURFACE WATER CONTROLS: Construct temporary structures (swales and berms) on the floor of the
<br /> pit and in stripped areas to(1) prevent erosion, (2)divert storm water from active mining areas and (3) convey water
<br /> to reclamation and stockpile areas or sediment/infiltration basin. Control drainage from the active areas and treat as
<br /> required by water quality regulations and permits to ensure that erosion is minimized and no sediment from the pit is
<br /> discharged off-site. Avoid use of silt fencing,culverts,piping,straw bales and other temporary and permanent controls
<br /> as much as possible. As necessary, construct infiltration/evaporation basins into the floor of the pit (into the shale
<br /> material under the deposit being mined)of an adequate size to allow infiltration(and evaporation)as rapidly as possible,
<br /> complying with state requirements. Install/maintain two standard CDOT-spec stabilized construction entrances:one in
<br /> the access road at the edge of the affected area (to prevent tracking of mud onto the ranch road (FSR-650)) and a
<br /> second on FSR-650 near the intersection with CR-600 (to prevent tracking onto CR-600). Ensure that capacity of
<br /> basins is adequate by calculating 80%runoff for a 3.7-inch storm events as being 398 CY(10,745 CF) per acre,with
<br /> a minimum 6-inch freeboard, (This is a basin of 3.5 feet depth by 45 ft by 163 ft with 3h:1 v side slopes.)
<br /> EXTERIOR (PERIMETER) SURFACE WATER CONTROLS: The pit floor and plant site floors will be below the
<br /> surrounding land surface and there will be no discharge under normal conditions(up to a 100-year storm event)from
<br /> these areas during mining and plant operations/materials storage. A berm will be left on the downhill side of those
<br /> areas to be mined on the edge of the mining area,for(1)storm water control,(2)safety,and(3)storage of backfill and
<br /> soil for reclamation. This will be abovern-front-of/uphill from the undisturbed alluvium deposit. It is not expected that
<br /> discharge temperature regulation may be required. No dewatering is anticipated, as ground flow through undisturbed
<br /> mineable material on the downhill sides of the pit will continue, and no flow from uphill into the pit is expected due to
<br /> terrain. Prevention and internal, temporary controls will minimize erosion, sedimentation, and traffic problems. As
<br /> necessary,stockpiles may have perimeter ditches/swales and berms with silt fence, straw bales,or rock check dams,
<br /> to reduce/prevent sediment in any runoff, and reduce loss. Do not use silt fence, straw bales, check-dams, etc.
<br /> extensively. Do not discharge water used for washing of material and dust control; rather recirculate/recycle as much
<br /> as possible, and otherwise allow to infiltrate into the ground(or evaporate).
<br /> SPECIFIC PERMIT CONDITIONS AND LIMITATIONS: COR-500000 requires or prohibits the following actions as
<br /> "control measures"or"best management practices"(BMP).
<br /> a. Minimize exposure by keeping working areas,stripped areas,stockpiles, plant locations and loading sites as
<br /> small and compact as possible, and minimizing the number, size, and length of traffic areas and roadways.
<br /> DO NOT cover or place activities inside.
<br /> b. Provide good housekeeping, including minimizing standing water and ponding, properly storing all materials
<br /> (especially water priority chemicals), and removing litter and fine particles as appropriate and possible.
<br /> c. Maintain control measures (best management practices) (BMP). Maintain berms, swales, detention and
<br /> retention basins in effective operating conditions.
<br /> d. Follow spill prevention and response procedures for all water priority chemicals IAW good engineering
<br /> practice, including inspection, testing, labeling, barriers (including secondary containment), leak/release
<br /> response procedures, notification, and training.
<br /> e. Control erosion and sediment internally to the operation, with particular attention to outer faces of perimeter
<br /> berms and swales.
<br /> f. Manage runoff(including removal of pollutants from water) by containing all water that would otherwise be
<br /> discharged, and removing pollutants (particularly oil and grease) that could potentially enter ground water
<br /> during infiltration.
<br /> g. Store salt safely by using established storage areas with liners,diversion and containment berms/swales.
<br /> h. Train miners and drivers annually in storm water management, in accordance with coordinated
<br /> MSHA/Envi ron mental training for C&J Gravel Products Inc.
<br /> i. Eliminate non-storm water discharges by discharging no water.
<br /> j. Eliminate discharge of waste,garbage and floatable debris by discharging no water
<br /> k. Minimize generating dust and tracking materials off-site:see fugitive dust control plan in Exhibit M-1.
<br /> C&J Gravel Products, Inc. Page 31 of 93 20 OCT 2021
<br /> Application for Permit: Oakbrush Hill Gravel M-2021- C&J-DPR-V5-001
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