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i <br />SAR's for well GBB3 are approximately six, while SAR values from well J1 have <br />been approximately one. <br />BACKFILL AQUIFER <br /> Backfill well, GFS, has been monitored the last three years. The data for the <br /> last two years indicates that TDS in [he backfill aquifer has reached the maximum <br /> (see Figure 4.8-49). The last two TDS values are greater than the HI aquifer would <br /> have likely contained in this area prior to mining, as expected. The backfill <br /> aquifer has also been measured at the Colt Seep, C pit, C pit minor seep and <br /> Cottomaood Spring. The backfill aquifer which discharges at the Colt Seep and C pit <br /> minor seep and into the C pit is stratigraphically equal to the KLP1 and QR aquifers. <br /> The Cottonwood Springs i s a discharge from the backfill aquifer developed from <br /> mining to Q and R seams. Table 4.8-10a shows that the water quality from the Colt <br /> Seep is approximately twice that observed in backfill well GFS.. The TDS seems to <br />have peaked at slightly over 2500 mg/1 from this backfill aquifer. The water <br />quality in the C pit, which probably receives a significant amount of backfill <br />ground water, contains a TDS significantly less than the Colt Seep. This indicates <br />that some backfill water quality in this area is better than the Colt Seep <br />discharge. The C pi[ minor seep contains a TDS slightly greater than 300 mg/1. The <br />Cottonwood Springs contains a TDS very similar to the TDS in backfill well GFS. TDS <br />in backfill aquifers should be elevated for several years after mining until the <br />readily dissolveable constituents are removed. <br />Data from backfill well GFS indicates that the backfill water will initially <br />be slightly alkaline with a pH of 8 while the June and September 1986 values were <br />4-233dd ~'`""'"' <br />~~------ r.. . <br />