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i <br /> <br />Richard D. Lamm <br />Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />MINED LAND RECLAMATION DI\ <br />DAVID C. SHELTON, Director <br />DATE: April 18, 1986 <br />T0: Gregg Squire <br />FROM: Candace Thompson ~1 / <br />RE: TRAPPER MINING - RESPONSES TO MID-TERM REVIEW AND 1985 AHR <br />The new format used by Trapper for the Annual Hydrologic Report greatly <br />facilitates review of data and depiction of trends over time. The data was <br />reviewed by a consultant for the mine and pertinent trends identified and <br />discussed. The inclusion of the map showing disturbance to date is well <br />presented as is the entire format. <br />The Division's review of the data confirms Trapper's narrative. There was a <br />trend noted in the Flume and Pyeatt Gulch baseline wells towards increased <br />levels of TDS. This could indeed be a phenomenon of flushing of soluble salts <br />during the past high water years as suggested in the AHR. However, as these <br />are baseline wells this trend should be carefully noted in subsequent AHR's. <br />Presently the report contains graphs of TDS over time for the wells. The <br />Division has found that plotting of conductivity values over time instead of <br />TDS is a better representation of quality over time due to the greater <br />availability of data. Plotting of the GF We]ls EC values over time show that <br />the wells mirror each other. These plots can be used to depict possible <br />vertical communication between beds and transport of spoil pit waters. Due to <br />this availability of data, the Division requests that the EC values be plotted <br />over time rather than TDS. Due to the completion problems with GBB -1 and 2 <br />these graphs do not need to be included. <br />In order to facilitate data review, the Division requests that the <br />climatological and pit pumpage data be included in the AHR with a discussion <br />of their effect on the hydrologic system included. <br />With the exception of the above mentioned problems, the Division finds the <br />Trapper AHR to be a comprehensive and easily reviewable document. The <br />responses requested in the mid-term review have also been supplied. <br />srs <br />9353E <br />423 ClIentennial Building, 1313 Sherman Street Denver, Colorado 80203 TelIl. (1i303) 866-3567 <br />