2008-11-03_REVISION - M1999098 - Laserfiche WebLink

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EXHIBIT G Water Information Introduction The proposed amendment to the current Riverview Resource site is to the north and to the east of the existing site. These new areas are located in the Southwest Y4 of Section 29 and the Northwest Y4 of Section 33, Township 6 North, Range 66 West, Sixth P. M. in Weld County. Figure G-1 shows the existing Riverview Resource area outline in black and the amended areas are shown in hatching. We will refer to the first amended site as the "north site" and is located on the northeast corner of 83rd Avenue and O Street in Greeley. The second site is on the southeast corner of 71St Avenue and O Street and we will call this the "east site". The operation will consist of sand and gravel production and will impact the Cache La Poudre River (Poudre) in the form of depletions due to evaporation and operational losses associated with mining. The duration of mining will last approximately 12 to 15 years depending on the economic conditions. The mining operation will impact groundwater systems hydraulically connected to the Poudre River. The depth to groundwater ranges from 14 to 19 feet below the ground surface on the north site and 4 to 6 feet below the ground surface on the east site. The Poudre River runs parallel to this site along the southern edge of the original Riverview Resource boundary. The amended locations lie approximately a quarter to a half mile north of the Poudre River. The Jones Ditch and Greeley No. 3 Ditch are south of the original site boundary. The Whitney Ditch enters this site from the northwest and basically flows through the middle of the entire site and terminates in the Poudre River at the most southeastern corner of the original site boundary. Storms Lake Drainage is a natural drainage that runs along the southwestern corner of the "north" amended area and south through the original site. To enable dry mining at the site, dewatering trenches will be constructed around the perimeter of the pit. Water from the dewatering trenches will be discharged to the Poudre River in accordance with the existing operation's Colorado Discharge Permitting System (CDPS) permit (Permit Number COG-500000, Facility COG-500345). There are no new proposed discharge points to the river at this time, however the CDPS permit will be amended if it is determined that additional discharge points are necessary. Once an amendment site is dewatered the only exposed surface water will be in dewatering trenches and that will be a minimal area of approximately 1 acre in size. In River Resource Amendment to Permit M1999098 112C Page G1 of G37