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• Revision ql -Page 14 of 30 Exhibit G Water Information The site presently has very poor surface drainage, with a slight gradient to the west at approximately 0.5%. An existing irrigation waste ditch, located on the adjacent property to the west of the proposed mining site, intercepts all upgadient surface runoff. Another irrigation waste ditch, located along the north property line, collects runoff from G Road and routes it to a catch basin located at the northwest comer of the project site. Surface runoff from within the project site migrates towards 23 Road, but because 23 Road is higher than the proposed project site, the water ponds on the west property line. l) Ijthe operation is no[ expected to dtrec!!y affect surface or groundwater systems, a statement ojtha! 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 Qualiry Control Division. Also, a Gravel Well Permit has been obtained from the Colorado Division of Water resources which allows pumping of the groundwater. 2) Ijthe operations is expected to directly affect surface or groundwater system, the Operator shall provide additional information. (a) Locate on the Ezhibi[ 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 There are no tributary watercourses, wells, springs, stock water ponds or reservoirs on the affected lands or adjacent lands. Irrigation ditches exist on the east and north property lines are depicted on the exhibit drawings. (b) /dentify all known aquifers The aquifers in the Grand Junction area are defined in the USGS Professional Paper #452, Geology and Artesian Wafer 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 brtejstatemenr 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 requ'ved which addresses specific pollution sources and mitigation techniques. A CDPS permit is requved for dewatering operations. The dewatering operations will discharge water into a settlement pond constructed at the northwest comer of the project to allow suspended soils time settle out of the groundwater before being discharged offsite. The CDPS permit also requires monitoring for specific pollution sources with quarterly Discharge Monitoring Reports submitted [o the Stale.