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• been obtained from the No Name Spring due to the limited amount of time that discharge has occurted at <br />this site. Backfill monitoring well water levels in this area (GF-5) are approaching the elevation necessary <br />to sustain flow from this site. The TDS from this spring (approximately 2400 mg/I) is higher than levels <br />observed in natural springs in the area. In addition, the spring's location (relative to A pit mining in this <br />area), elevation, and water level correlation with nearby well GF-5, suggest the backfill aquifer is the likely <br />source of this spring. The limited TDS data from No Name Spring indicates a TDS concentration <br />approximately two times the TDS in nearby backfill well GF-5. <br />The TDS from the Johnson Gulch Spring is approximately 4000 mg/I, which is significantly greater than <br />the other spoil springs identified to date at Trapper. The backfill aquifer near this spring exhibits a similar <br />TDS concentration at Well GF-7. Sulfate concentrations in well GF-7 remain quite variable. Mining has <br />elevated the TDS in Johnson Gulch Spring. Concentrations in this spring are expected to gradualty <br />decline over an extended period of time as previously discussed. Limited data exists on the remainder of <br />the spoil springs due to the small amount of time that discharge has occurted from these locations and the <br />minimal flows involved. Water quality constituent concentrations at each of these sites are well within the <br />range of naturally occurring concentrations at various sites throughout the mine. <br />Presently, springs are sampled for water quality if the flow rate is greater than 5 gpm. This criteria is a <br />useful way of determining which springs and seeps to monitor due to the variability of the surface <br />discharges with time. A specific list of springs to be checked each spring for flow was developed following <br />• the detailed inventory in 1997. The East Pyeatt, Johnson Gulch, and Cottonwood Springs are devebping <br />useful monitoring data with time and are included on the monitoring list. The springs are typicelty used for <br />livestock and wildlife watering. No domestic or irrigation uses have been identified. <br />• <br />,_, ,,_ <br />_.-. ~,,;~_.~0~--2-3-980 <br />4-248b <br />