Laserfiche WebLink
r~ <br />~~ <br />Mine dewatering. The reduction in the rate of recovery of water <br />level should gradually occur as the length of time since dewatering <br />increases. This is likely the r_ause of the -slower rates) of <br />I <br />water-level recovery in the GE wells, but the decline in <br />I <br />precipitation andJor the dew..=_tering that started in C pi.t (1988) <br />i <br />and B pit (December. 1989) could be a cause. <br />Water levels in the GF wells are tabulated in Tables A-4! A- <br />5 and A-o (pages P.-47 through A-5ii of Appendix: A. We11s GFi and <br />GF3 are flowing wells. while the casing on well GF_ was extended in <br />1935 and it no loncer flows. Figure A-14 shows the water-live) <br />elevations ir. the Twentymile Sandstone at GF1. Water level) in <br />well GF1 have been fairly steady during the last two years land <br />similar to the 1935-1986 elevations. Water levels were gradually • <br />increasing in well GF2 (Figure A-15) until mid-19S7, then the <br />levels der_lined in 1989. The water levels in the second half of <br />1990 through 1992 are similar to the 1989 levels. This declinl is <br />probably due to lower precipitation the last few years. <br />Water levels had risen .=.t .a fast rate in the KLM aquifers in <br />this area through 1987 (see Figure A-16, well GF.3). Water levels <br />appear to have stabilised during 1988. The 1989 through 1992 wafter <br />levels have been fairly stable. Water levels ir. well GF4 rose at <br />a fast ra±e until June, 1987 and the <br />Levels were steady throughout 1991 <br />Most of the water-level rise ir. the <br />wells is thought to be caused by the <br />ground water along with recovery <br />n gradually rose through 1990. <br />_ _ <br />and 1992 (see Figure A-14). <br />KLM and !~? .aquifers at the)GF <br />upg.raclient backfill re leashing <br />and stabilization from mine • <br />8 <br />