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Probable Hydrologic Canscgumccs - Chimnry Rock Minc <br />seepage area from the pit would enable a rectangular seepage area of 350 feet long by 15 feet high <br />to transmit all of the Barren Ridge pit's 24.92 gpm (approximately 40 acft) of annual recharge, <br />calculated as follows: <br />Annual seepage from both pits = (15 ft. high)(350 ft. long)(0.94 ft/day) = 4935 ft'/day or 41.5 <br />acftlyr <br />Therefore for each pit: <br />East Pit Discharge <br />46 acres (East Pit)/85 acres(total) x 5250 ft' (area of discharge) = 2840 ft' of discharge area <br />Barren Ridge Discharge <br />39 acres (Barren Ridge Pit)/85 acres(total) x 5250 ft~ (area of discharge) = 2410 ft' of discharge <br />area <br />For each pit then, the seepage area would be equal to the cube root of the area estimated. <br />Therefore the discharge area of the east pit could comprise an area 14.16 ft x 14.16 ft x 14.16 <br />feet, and the area of the Barren Ridge pit could comprise an area of 13.4 ft x 13.4 ft x 13.4 ft. <br />These areas would more likely be linear features that would be associated with the toe of the spoils <br />piles. The potential seepage of the Barren Ridge pit would most likely be along the eastern side <br />of the pit towards Stollsteimer Creek. This seepage area would most likely be located at the <br />contact of the alluvium and Fruitland formation as shown on cross-section AA-AA' (Figure 4). <br />The seepage area would therefore extend for several hundred feet along the base of the east side <br />of the ridge (Barren Ridge) in the center of Section 30-T34N-R4W (Figure 4). <br />The seepage area for the East Pit would be similar to that of the Barren Ridge but would exist on <br />the west side of the Stollsteimer Creek, (west of [he East Pit). This area would most likely be <br />adjacent to Stollsteimer Creek on the west side of the creek. The seepage from this pit would most <br />likely travel via underflow from the pit through the alluvium and emanate from the alluvium near <br />the creek. The contact of the pit and alluvium is thought to be at some depth, and therefore the <br />seepage area would not occur at the toe of the spoils pile. This potential seepage area is indicated <br />on Figure 4. <br />Well W-16 was drilled to monitor water quality in the East Pit spoil aquifer. When the last <br />G~'11 samples were taken from W-16 in 1991, the water level elevation in the well was approximately <br />.(~~~449~feet (AMSL). The elevation indicates that effluent from the East Pit spoil aquifer could be <br />seeping into the Stollsteimer Creek alluvium near the southwest corner of the pit south of pond 002 <br />(N'hSE'/a Sec. 30-T34N-R4W). <br />Jc~o4..d a/ev. c4S5~~- cas:H~he~Skt 7.75-~`l9~wfr./e,.aQ~ 9(/6~/( <br />Reused hydrologic-05]505-21-0(B:ODAM) 13 <br />