COMPLIANCE INFO_1992 - Laserfiche WebLink

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KLEINFELDER are fairly variable, both spatially and temporally. Water types, based on this information alone, are as follows: Well Water Type MW-1 Calcium/Sulfate MW-2 Calcium/bicarbonate to calcium/bicarbonate-chloride MW-3 Calcium/sulfate to calcium/sulfate-chloride-bicarbonate MW-4 Calcium/chloride Three constituents/parameters were reported at concentrations exceeding secondary MCLs. Iron was reported in -1 at 0.39 mg/l in January 1990, slightly exceeding the secondary MCL of 03 mg/1. Sulfate was reported in MW-1 at 264 mg/l in June 1989 and 251 mg/l in January 1990, slightly exceeding the secondary MCL of 250 mg/1. High TDS concentrations were reported in all wells, ranging from 453 to 1020 mg/l, generally exceeding the secondary MCL of 500 mg/l. The highest concentrations were reported in the background well, MW-1. Field parameters (pH, specific conductance, and temperature) were measured in the four wells quarterly (Table 5-9). In general, pH appears to have increased and temperature decreased in the wells in October 1989 and January 1990. The specific conductance measurements during January appear to be in error due to equipment problems. Laboratory measurements of this parameter during January are available (See the parameter EC in Table 5-8). 5.3.3 Discussion of Ground Water Monitoring Results Semi-annual monitoring of the ground water during 1989/1990 did not indicate that the ground water has been affected by the landfills or surface impoundments. Based on three of the four rounds of ground water gradient measurements between June 1989 and April 1990 (one round was excluded due to a probable error in measurement), it appears that the ground. water gradient beneath the site is approximately 0.1 to 0.2 percent to the northeast. Based on apparent ground water flow to the northeast, MW-1 is upgradient of the facility; MW-2 downgradient of WMU-E; MW-3 is downgradient of WMUs A,B and C; and MW-4 is downgradient of WMU-F. CR14-92-12 Page 19 of 39 24-220109-1709 Copyright 1992 Kleinfelder, Inc.