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Bureau of Land Management Environmental Assessment <br /> Royal Gorge Field Office DOI-BLM-CO-F020-2019-0056 EA <br /> All earthen stormwater structures (e.g. berms and ditches)would remain throughout the duration <br /> of the mine and would be topsoiled and revegetated for stability. Stormwater berms would be <br /> approximately 2 to 3 feet high and installed along the northern boundary. No mining will occur <br /> beyond the northern berm. The sediment pond would be monitored and maintained to handle <br /> stormwater flows that may enter either from the eastern highwall or surrounding natural <br /> ephemeral pathways. The product stockpiles would be changing as more material is removed and <br /> added, for this reason a perimeter drainage ditch could be used instead of a silt fence. This <br /> perimeter drainage ditch can be easily moved and maintained with heavy equipment onsite. <br /> These stormwater controls would be installed to prevent surficial and potential groundwater <br /> degradation. BLM would require a Stormwater Management Plan(SWMP) and Stormwater <br /> Permit with the CDPHE prior to the issuance of a mineral material contract. Stipulations and best <br /> management practices could be applied to the contract to further manage stormwater quality. The <br /> Colorado Department of Transportation(CDOT) is requiring the operator to have a hydrological <br /> assessment before issuing a State Highway Access Permit; therefore,the specific surficial <br /> outfalls, drainages and point sources affecting the structural integrity of the proposed entrance <br /> and access road would be documented in the assessment. BLM would require a copy of this <br /> report prior to the issuance of the mineral material contract and all stormwater control mitigation <br /> outlined in the assessment will be reviewed and upheld by BLM. <br /> Structures <br /> All proposed structures would include a portable storage/office trailer, generator station, water <br /> truck, fuel tanks, sanitary facilities,portable processing plant,mobile heavy equipment, POL <br /> storage area(secondary containment), and smoking area(Figure 4). All permits, easements and <br /> management plans would be obtained and followed prior to construction of any structures. All <br /> structures are considered temporary and would be secured or removed during non-operational <br /> periods. <br /> Fuel, lubricants, and hydraulic fluids would be stored adequately in secondary containment(e.g. <br /> bed of maintenance truck). A 5-gallon and 20-gallon spill kit are always stored onsite which <br /> include gloves, sorbent, dustpan and container to collect and store the contaminated soils. <br /> Fueling and servicing would be performed in designated locations onsite. No deleterious or <br /> other hazardous chemicals would be used or stored onsite. In case of a spill/leak, contaminated <br /> soils would be promptly contained using standard commercial absorbents and properly disposed <br /> of at an authorized, offsite location. All power to buildings and power-generated equipment <br /> would be sourced from an onsite diesel generator. <br /> Safety <br /> All Federal, State and County permits would be obtained prior to initiating mining activity <br /> (reference Permits section below)to ensure all safety regulations are monitored and enforced. <br /> 11 <br />