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~E~~N <br />FUEIS-U'G~H <br />INC. <br />n s~rarr~rr~.,~ <br />of <br />Wa(em Fuck <br />Atcxtahon, /nc <br />Ms. Barbara L Pavlik <br />RE(;EI1/ED <br />JUL 2 5 1995 <br />Division of minerals s Ueoiogy <br />July 24, 1995 <br />Environmental Protection Specialist <br />Division of Minerals & Geology <br />1313 Sherman Street, Room 215 <br />Denver. Colorado 80203 <br />RE: Prellminary Adequacy Revlew <br />T.R. 37 Deseredo Mine <br />C-81-018 <br />Dear Ms. Pavlik: <br />iii iiiiiiiiiiiiiiii <br />I am responding to your inquiry regarding WFU's justification for eliminating bedrock groundwater <br />quality monitoring. <br />Data justifying WFU's position are compiled in the first hydrology report entitled °Deserado Mine First <br />Annual Hydrology Report With Summary of Hydrologic Data and Analysis 1981 Through September <br />30, 1985.° This report was submitted to Mined Land Reclamation Division in December 1985. <br />Appendix B of the report gives results of baseline groundwater sample analysis. Appendix F of the <br />report gives water quality analytical data. <br />Please note the following: <br />Bedrock water samples were collected from eleven (11) of the bedrock monitor holes from 1981 <br />through the third quarter of 1984. Water samples were collected from three (3) upper sandstone <br />facies holes (2-7u, 2-12u and 4-20u); seven (7) siltstone coal facies holes (TW2-17m, 29-4m, 30- <br />8m, 31-7m, 32-7m, 33-Bm and 35-4m); and hole 38-2L in the lower sandstone facies. <br />The water quality data during the monitoring period (1981 through third quarter 1984) from the three <br />monitor holes located in the upper sandstone facies showed that the average total dissolved solids <br />(fDS) content varied from 1260 mgA at TW2-7u to an average of 2080 mgA at 4-20u. This <br />compared with a baseline showing TDS carrying from 420 mgA to 3350 mgA. High fecal and total <br />colifonn were detected in 4-20u in samples collected on September 21, 1983. The high coliform <br />concentration was the result of a dead animal (mouse or rat) in the monitor hole. <br />The water quality data for seven (7) holes monitoring the siltstone coal facies showed that the <br />average TDS for the monitoring period varied from a low TDS of 252 mgA at 31-7m to a high TDS <br />at 33-8m of 2282 mgA. This compared with a range of TDS in the siltstone coal facies during <br />baseline studies ranging from 325 mgA to 574 mgA. Holes 31-7m and 30-8m both had low <br />concentrations of TDS compared to the other siltstone-coal facies monitoring holes; the result of <br />being located closer to the area of recharge for this zone. <br />Swte #305 <br />405 Urban Street <br />lakeaood, Coloado 80228 <br />Telephone 303/988-9626 <br />Telecopier 303/986-8147 <br />