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Probab(r Hydrologic Consrquertccs - Chunrtry Rock Minc <br />• 39 acres, for a total area of 85 acres. Assuming that 25% of precipitation infiltrates, the <br />backfilled pits will discharge 23.75 acre-feet per year or 90 gpm (0.2 cfs) over a two month <br />period. <br />1.1175 ~ x85acres=94.98 acft x25%=23.75acft/year <br />year year <br />23.75 a~~ x325,851 gallO~ =7,738,961gallons/year <br />year acft <br />7,738,961 gallo7cs x year x days x lhour =90gpm <br />year 60days 24hours 60min <br />• The flow data on Stollsteimer Creek is limited to data collected by Kaiser. The lowest flow <br />recorded occurred in June 1989, at Station S-1 and was 1.78 cfs. The TDS was 557 mg/l. <br />Kaiser has run a regression analysis on total dissolved solids in spoils well, W-16 in the East <br />Pit which projects a maximum spoils total dissolved solids concentration of 1294 mg/I in the <br />year 2004. A weighted salinity loading between the low flow and the projected spoils discharge <br />yields a total dissolved solids concentration of 631 mg/l. <br />((1.78 cfs x 557 mg/I) + (0.2 cfs x 294 mg/1))/1.98 = 631 mg/I <br />This concentration would not pose a limitation to downstream users. <br />PICTURED CLIFFS SANDSTONE IMPACTS <br />A similar evaluation of the probable impacts to the Pictured Cliffs Sandstone cannot be <br />performed. The Pictured Cliffs is separated from coal seam "C" by approximately 35 feet. <br />Between the fill material and the sandstone is a shale, sandstone, and coal sequence. Shales are <br />considered an impermeable material and an associated vertical hydraulic conductivity is not <br />available (Fetter, 1981). Impacts to this aquifer are therefore not anticipated. <br />• <br />R1.053U101-28-95~10:47am) 12 <br />