2009-08-28_PERMIT FILE - M2009035 (3)

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112 APPLICATION PAGE 19 OF 35 • 6.4.7 Exhibit G - Water Information Drainage on the existing site is very poor. Runoff from within the project properties currently remains within the property as it sheet flows toward the abandoned sewer ponds centrally located within the historic basins. The site is hydraulically isolated from offsite flows by existing topography and surrounding ditches. The 33 Road Drain borders the site along the northwest side and travels southwest. The site currently does not have irrigation water. 1) If the operation is not expected to directly affect surface or groundwater systems, a statement of that exception shall be submitted; The proposed sand and gravel pit should have impact the existing groundwater. A Colorado Discharge Permit for Sand and Gravel Production Operations has been obtained from the Colorado Department of Public Health and Environment Water Quality Control Division. Also, a Gravel Well Permit has been obtained from the Colorado Division of Water Resources which allows pumping of the groundwater. 2) If the operation is expected to directly affect surface or groundwater system, the Operator shall provide additional information. (a) Locate on the Exhibit C Map tributary water courses, wells, springs, stock water ponds, reservoirs, and ditches on the affected lands and on adjacent lands where such structures may be affected The 33 Road Ditch to the west of the affected area as well as the pond on the east side are depicted on Exhibit C. is (b) Identijy all known aquifers The aquifers in the Grand Junction area are defined in the USGS Professional Paper #452, Geology and Artesian Water Supply, Grand Junction Area, Colorado, by S. W. Lohman. A salty Dakota Formation is possible at depths around 400 feet below the existing ground surface. The Somerville Formation is approximately 800 feet below the ground surface. The only potable water aquifer is the Entrada Sandstone Formation, which is approximately 1,000 feet below the ground surface. (c) Submit a brief statement or plan showing how water from dewatering operations or from runoff from disturbed areas, plied materials and operation surfaces will be managed to protect against pollution of either surface or groundwater, both during and after the operation. All surface water runoff, except in the active mined area, will be collected and retained on the project site. There will be no releases to surface water flows due to existing topography constrains. As part of the CDPS discharge permit system, a site specific Stormwater Management Plan is required which addresses specific pollution sources and mitigation techniques. A CDPS permit is required for dewatering operations. The dewatering operations will discharge water into a settlement pond constructed at the northwest corner of the project to allow suspended soils time settle from the groundwater before being discharged offsite. The CDPS permit also requires monitoring for specific pollution sources with quarterly Discharge Monitoring Reports submitted to the State. •