2019-05-31_PERMIT FILE - M2016022

Home Browse Search

Exhibit G — Water Information Impact to Surface and Groundwater The operation of the proposed topsoil mine is not anticipated to have any effects to surface or groundwater systems. The nearest surface water feature is Lowline Canal located approximately 1,000 feet to the north (Figure C- 4, Exhibit C). No surface water feature is present on the Affected Land. An Approved Jurisdictional Determination has been received from the United States Army Corps of Engineers (U SAC E), Omaha District, stating "a Department of the Army permit will not be required for the discharge of fill material on this site under section 404." However,the USACE has requested that approximately one acre of depressed area be removed from the southeast corner of the permit area. These changes are reflected in figures presented in Exhibit C.A copy of the letter is provided as an attachment to this Exhibit. The Affected Land is bound by a 4 to 6-inch berm and is anticipated to prevent discharge form the site. There are four groundwater wells located within the 200-foot buffer zone of the affected area. Review of the well permits indicate that the wells are constructed within alluvium of the Lost Creek Basin. Based on an aquifer recharge and storage study prepared for the Lost Creek Ground Water Management District (CGS, 2011), groundwater is located within the Pleistocene Gravel and Alluvium at a depth of approximately 50 feet below ground surface. As the maximum depth of impact within the Affected Land will be less than 2 feet below ground surface, groundwater will not be impacted. Operational dewatering will not be undertaken. During preparation of the 110 Permit application, Colorado Division of Water Resources indicated no impact to groundwater resource(letter appended to this Exhibit). Estimated Water Usage and Sources Currently, no water is anticipated to be utilized during the topsoil mining efforts. Primary dust control will be through increasing soil surface roughness in areas not actively being mined fortopsoil and in areas that have been mined. Water may be used infrequently for dust control during mining activities.Water will be sourced from municipal water sources and transported to the site by a water tanker vehicle if needed. Discharge Permit Requirements As the mining operational plan involves no water usage, no discharge will occur at the site and a NPDES discharge permit is not required. Reference CGS (2011) Lost Creek Basin Aquifer Recharge and Storage Study. Colorado Geological Survey report prepared for Lost Creek Ground Water Management District dated December 2011.