HYDRO29444 - Laserfiche WebLink

Home Browse Search

iii iiiiiiiiiiiiiiii STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY DepanmeN of Nawral Resources 1313 Sherman 51., Room 215 Denver, Colorado 80203 Is~ Phone: 1303) 866-3567 FA%:13031832-8106 DEPARTMENT OI NATURAI October 12, 1994 RESOURCE: Roy Romer Gove.nar Mr. John F. Hickman IamesS L«hhead Mr. Greg Lindsay E.ecuove Director Western Mobile Northern Michael B. Long Divaion Director 1800 North Taft Hill Road P.O. Box 2187 Fort Collins, Colorado 80522 RE: Greeley West Pit, File No. M-77-081 Dear Mr. Hickman and Mr. Lindsay: The Division has reviewed your response concerning local monitoring data which might establish a relationship between your dewatering activities and the affects on nearby wells. Included in your submittal were two sight specific engineering reports from 1977 and 1982 and aerial photographs from 1992 and 1993. The 1982 report completed by Leonard Rice Consultants addressed a problem with two nearby wells apparently completed in the Laramie Formation at depths of 82 feet below ground level (fbgl) and 123 fbgl. The 1977 report completed by Leonard Rice addressed the water table drawdowns associated with gravity drainage of an existing lake resulting from a proposed outlet connecting the lake to the Cache La Poudre River. The 1982 engineering report is not pertinent since it addresses problems with wells completed in a deeper, partially confined Laramie Formation aquifer. The wells owned by Mr. Elmer Andrews and subsequent complainants are apparently completed in the alluvial aquifer. The 1977 engineering report does not apply because it did not address the drawdown related to pumping activities. The Division has received additional complaints of water level decreases in wells adjacent to your operation (see list below). The wells apparently have been completed in the alluvial aquifer and the owners report that the groundwater levels have decreased from about 13 fbgl to 25 fbgl in the past few years. The complainants share wells located on 28th Avenue, adjacent to your recent pit expansion. Since there is no monitoring data currently available, you will need to submit a plan to the Division no later than December 12, 1994 to evaluate the impact your dewatering activities have on ground water users adjacent to the operation. When wells are identified which may be impacted by the dewatering activities, you will need to enter into