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DIVISION OF MINERALS AND GEOLOGY <br />(lc),arinu•nl ,I Natural Rcsourc es <br />111 1 Sherman SI., Room 215 <br />)envc•r, ( ulurado 8(12111 <br />Phone- 4 41)1) 8(4, IS(r7 <br />I AX• I H11) 8 42- 81116 <br />October 12, 1994 <br />Mr. John F. Hickman <br />Mr. Greg Lindsay <br />Western Mobile /Northern <br />1800 North Taft Hill Road <br />P.O. Box 2187 <br />Fort Collins, Colorado 80522 <br />RE: Greeley West Pit, File No. M -77 -081 <br />STATE OF COLORADO <br />d inPr i "4 <br />PI <br />DEPARTMENT <br />NATUR <br />RESOURC <br />Roy Romer <br />Governor <br />lames S.Lcxhluad <br />Lxec wive [Met t rnr <br />Michael R. Long <br />Division Director <br />Dear Mr. Hickman and Mr. Lindsay: <br />The Division has reviewed your response concerning local monitoring <br />data which might establish a relationship between your dewatering <br />activities and the affects on nearby wells. Included in your submittal <br />were two sight specific engineering reports from 1977 and 1982 and <br />aerial photographs from 1992 and 1993. <br />The 1982 report completed by Leonard Rice Consultants addressed a <br />problem with two nearby wells apparently completed in the Laramie <br />Formation at depths of 82 feet below ground level (fbgl) and 123 fbgl. <br />The 1977 report completed by Leonard Rice addressed the water table <br />drawdowns associated with gravity drainage of an existing lake <br />resulting from a proposed outlet connecting the lake to the Cache La <br />Poudre River. <br />The 1982 engineering report is not pertinent since it addresses <br />problems with wells completed in a deeper, partially confined Laramie <br />Formation aauifer. The wells owned by Mr. Elmer Andrews and subsea ent <br />complainants are apparently completed in the alluvial_ aauifer. The <br />1977 engineering report does not apply because it did not address the <br />drawdown related to pumping activities. <br />The Division has received additional complaints of water level <br />decreases in wells adjacent to your operation (see list below). The <br />wells apparently have been completed in the alluvial aquifer and the <br />owners report that the groundwater levels have decreased from about 13 <br />fbgl to 25 fbgl in the past few years. The complainants share wells <br />located on 28th Avenue, adjacent to your recent pit expansion. <br />Since there is no monitoring data currently available, you will need to <br />submit a plan to the Division no later than December 12, 1994 to <br />evaluate the impact your dewatering activities have on ground water <br />users adjacent to the operation. When wells are identified which may <br />be impacted by the dewatering activities, you will need to enter into <br />