2015-05-13_HYDROLOGY - M2004017 - Laserfiche WebLink

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I. SITE DESCRIPTION The activities associated with the Kattenberg Aggregate Pit include construction of haul roads, storage and maintenance buildings, topsoil stockpiles, overburden and waste rock stockpiles as well as conveyors and crushers to enable mining of sand and gravel operations. The parcel is located in the Southeast one-quarter of the Southeast one-quarter of Section 33, Township 2 North, Range 76 West of the 6th Principal Meridian, Grand County, Colorado and contains approximately 38. 65 Acres, of which approximately 100% will undergo disturbance. Existing vegetation on the site, as determined by a NRCS investigation, consists primarily of non -grazed rangeland including Bottlebrush squireltail, Fescue, Needle grass, Mutton grass, Blue grass, Western wheatgrass, Sagebrush, Buckwheat and Phlox with a basal density of approximately 10-15 percent. The reclamation recommendations provided in this report concluded revegetation efforts should occur annually each fall, prior to ground freezing. Stockpiled topsoil should be spread over scarified underlying materials and seed should be placed 3 to 2 inch into a friable, but firm seedbed. The potential for point -source pollution of stormwater runoff including fuel storage tanks, vehicle maintenance, sanitary facilities as well as process water and mine drainage exist and will be addressed in the following sections of this SWMP. Non-stormwater discharges associated with the Kattenberg Aggregate Pit may include flow from a Spring in the Southwest portion of the site, and hydrogeological information collected in the vicinity of this site confirm a 2% hydraulic gradient from shale outcroppings at an elevation of approximately 8080 extending to the Northeast for a maximum groundwater elevation of approximately 8120. Surface drainage from this site will follow a Southwesterly flow pattern, in defined drainage ways, to the Fraser River.