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Water levels had risen at a fast rate in the KLM aquifer in <br />this area through 1987 (see Figure A-16, well GF3). Water levels <br />appear to have stabilized during 1988. The 1989 through 1991 water <br />levels have been fairly stable. Water levels in well GF4 rose at <br />a fast rate until June, 1987 and then gradually rose through 1990. <br />Levels were steady throughout 1991 (see Figure A-17). Most of the <br />recent water-level fluctuation in the KLM and HI aquifers at the GF <br />wells is thought to be caused by the upgradient backfill releasing <br />ground water along with recovery and stabilization from mine <br />dewatering. Present levels may be close to pre-mine levels. <br />Figure A-18 shows that water levels in backfill well GF5 have <br />risen steadily since its installation to mid-1988. Water levels <br />• have been gradually declining since then, probably due to the dry <br />cycle. Pre-mine water levels may have been higher in the HI <br />aquifer at site GF5. The average water levels in well GF6 for 1988 <br />and 1989 were fairly stable after declining steadily from levels <br />for 1988 and 1987 (see Figure A-19). Water levels rose in the <br />Spring of 1990 and then returned to a declining trend seen prior to <br />that Spring. Water levels in the QR aquifer are thought to be <br />reflecting historical precipitation influences. Upgradient mining <br />in 1983 could have caused some water-level fluctuations, but <br />overall trends are thought to have been caused by natural <br />influences. <br />Figure A-20 presents water-level data collected for well GF7. <br />This hydrograph indicates that water levels were steadily rising <br />. during 1987 and 1988 and may have begun to stabilize during 1989 in <br />2-9 <br />