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• S r~9.._ <br />Only two significant springs exist within the mining area (see Figure 3.6.1-3). <br />According to baseline data, Sp-1 flowed during all months of the year with a relatively <br />constant discharge of approximately 1 gallon per minute. This discharge frequently <br />has ayellow-green color and exhibits a strong hydrogen sulfide odor. <br />Sp-1 appears to issue from the top of the Upper Sandstone, with minor contributions <br />also from the Sunshine coal seam. <br />Sp-2 is located approximately 100 feet above North Thompson Creek, and appears to <br />issue from the Upper Sandstone. Based on the spring location relative to the <br />topography, flows may be structurally controlled. Sp-2 shows much more seasonal <br />discharge variation, than Sp-1. Discharges were generally greater than 1 gpm, with <br />between 20 to 40 gpm common from late May through June. (All cited discharges are <br />based on visual estimates). <br />Water quality analyses for samples from Sp-1 and Sp-2 collected between December <br />7, 1977 and August 9, 1979 are included in Appendix 3-L. <br />Baseline Monitoring Program <br />Water quality samples were collected for more than one year at the ground water <br />monitoring wells. Single samples were collected from the piezometer weds (PZ-2 and <br />3) in Mine No. 3. As such, it is proposed that the monitoring wells (M-1, 3, and 4) be <br />sampled on a semiannual basis, and that wells PZ-2 and 3 be sampled quarterly. <br />Underground observation sites noted on Figures 3.6.1-5, 6, and 7 were sampled semi- <br />annually, and field measurements would be made every two months. <br />Measurementslestimates of inflow were made every two months, and revised inflow <br />figures and.maps prepared annually. <br />The proposed monitoring frequencies at all ground water sites are summarized in <br />Table 3.6.1-9. <br />• 3-59 June 1998 <br />~N -D 3 <br />Q-id <br /> <br />