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• • (nrencifo Canvon Mine - C~aundwWer Trchru~ca/ Reoor( TABLE GW-4 LORENCITO CANYON MINE SAMPLE PARAMETERS AND METHODS Parameter Method Detection Limit (mg/L) Cobalt EPA 200.7 ICP 0.01 Copper EPA 200.7 ICP 0.01 Iron EPA 200.7 ICP 0.01 Lead EPA 239.2 GFAA 0.001 Lithium EPA 200.7 ICP 0.02 Manganese EPA 200.7 ICP 0.005 Mercury EPA 245.1 CVAA 0.0002 Nickel EPA 200.7 ICP 0.01 Selenium SM 3500-Se C, AA-Hyd. 0.001 Silver EPA 200.7 ICP 0.005 Thallium EPA 279.2 GFAA 0.002 Vanadium EPA 200.7 ICP 0.005 Zinc EPA 200.7 ICP 0.01 Total Metals Iron EPA 200.7 ICP 0.01 Manganese EPA 200.7 ICP 0.005 Total Metals Digestion EPA 3010 n/a was substantially reduced. Following the initial sampling/development event, wells were bailed at each subsequent event until the field pazameters (pH, conductivity, temperature) stabilized, then sampling occurred. Following this procedure, field parameters were obtained from each well. Subsequently, the wells were sampled. Samples from each well were obtained via a PVC bailer. Each sample was treated according to the requirements of the parameters analyzed for (Table GW-3). Samples were preserved by cooling to 4° C and shipped for receipt by the laboratory prior within the required holding times. Each of these samples were analyzed for the constituents found on Table GW-4. methodologies correspond to analytical procedures identified in 40 CFR with three subtle exceptions. Lithium is not specified in 40 CFR 136 but was analyzed with the approved ICP metals analysis for many metals, EPA 200.7 ICP. The automated technique for selenium was utilized rather than the manual technique. The total metals digestion comparable to EPA's "Methods of Chemical Analysis of Water and Wastes." • Water quality data was synthesized by developing tables of concentration over time for the major cations and anions (carbonate, bicazbortate, sulfate, sodium, potassium, magnesium, and calcium) Groundwa~er.475\April 29, 1997 8 (revised 4/24/97)