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RE: Prowers Aggregate Operators, LLC. - West Farm Pit-Permit No. M-2008-078 <br /> 112c Permit Amendment Application (Revision No. AM-01) <br /> Preliminary Adequacy Review Response 12121118 <br /> -12- <br /> describe what measures the operation will take to prevent any impacts to this state <br /> endangered species. <br /> Response: Improvements were made during 2018, as reflected in the attached <br /> revised Stormwater Management Plan, to ensure no adverse impacts to the <br /> Arkansas River critical habitat. All groundwater/process water/stormwater is <br /> directed into the bottom of the active pit or allowed to infiltrate into the ground <br /> within the permit area. The water directed into the bottom of the pit is treated <br /> through a series of sediment ponds, and then recycled into the wash plant located <br /> on the pit floor. When excess groundwater/process water/stormwater is <br /> discharged from the pit floor, it is pumped into a ditch and flows through a final <br /> set of sediment ponds located in Phase 6, then flows in a ditch to a discharge <br /> point located at the northeast corner of the site. Per the requirements of the <br /> Stormwater Management Plan and CDPHE discharge permit, the discharged water <br /> is tested at the outfall for pH, total suspended solids, grease, and a variety of <br /> other properties/contaminants to ensure that discharges meet the requirements <br /> for water quality discharges from a gravel mining facility. This ensures that the <br /> water discharged from the site will not contaminate the water flowing in the river, <br /> and ensures that discharges from the pit will not adversely affect the wildlife <br /> habitat within the river and river corridor. <br /> Exhibit L- Reclamation Costs (Rule 6.4.12): <br /> 36) Please submit an Exhibit L map showing the proposed scenario for the reclamation bond. <br /> This map should depict the site at the point in time of maximum disturbance (including <br /> Parcel A and Parcel B), and should correlate with the reclamation tasks included in the <br /> bond estimate. <br /> Response: See the attached Exhibit L Reclamation Phasing Map. <br /> 37) On the Reclamation Cost Summary table, please include a column with estimated <br /> acreages for each row. <br /> Response: A column with estimated acreages for each row has been added. See <br /> the attached revised Exhibit L narrative and Reclamation Cost Summary Table. <br /> 38) Please clarify whether sediment ponds and ditches will require backfilling for reclamation. If <br /> so, please specify the source of the backfill material, provide an estimated volume of <br /> backfill material required, and include costs for this task in the bond estimate. <br /> Response: Any ponds or ditches that are outside the mining limits will be <br /> backfilled, topsoiled, and seeded or used as agricultural farm ground after mining <br /> is complete. The source of the backfill material will be excess overburden from the <br /> mine. Estimated volumes of backfill, and the costs to place it are included in the <br /> revised reclamation bond estimate. Ponds and ditches within the mining area will <br /> be mined through and removed as part of the extraction of the sand and gravel <br /> reserves. <br /> 39) Please provide more details on how the scale house and the conveyor will be demolished <br /> or removed for reclamation. What equipment will be used for demolishing/removing these <br /> structures? Will the materials be disposed of on site or hauled off site for disposal? If the <br /> materials will be disposed of on site, please indicate the anticipated location(s) on the <br /> Exhibit L map. Please be sure the bond estimate includes all costs for <br /> demolishing/removing these structures, including costs for disposal. <br /> V, 305 Denver Avenue-Suite D• Fort Lupton CO 80621 •Ph: 303-857-6222•Fax: 303-857-6224 <br />