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' • • �`■ KLEINFELDER 1 ' 4 SUMARY OF FINDINGS ' Based upon the contract lab and referee lab analytical data, low ' concentrations of several elements were reported above the detection limits in the April 1987 ground water samples. With regard to the principal constituents of concern (chromium, lead, nickel, and zinc) , only nickel was reported at concentrations which are greater than the ground ' water quality objectives in monitoring well MW-1 and MW-2. Analysis of an MW-1 sample via ICP indicates the presence of nickel at a concentration which is less than that measured by AA yet greater than the ground water quality objectives. Chromium, lead, and zinc were detected in MW-1 samples at concentrations that are less than the ground water quality ' objectives . ' The highest concentrations of chromium and nickel, as reported in this sampling round and in all previous sampling rounds, are from samples obtained from monitoring well MW-1 (see Appendix B and Table 2) . Chromium has been detected in MW-1 samples at concentrations ranging from 0.018 ' mg/L to 0.08 mg/L during each sampling round. Nickel was first detected in the December 1986 MW-1 samples and since then has been reported at concentrations ranging from 0.02 mg/L to 0.089 mg/L. ' Arsenic was detected by both laboratories in MW-1 samples at ' concentrations that are less than the ground water quality objective of 0.05 mg/L: 0.025 mg/L by APPL, and 0.030 mg/L by CAL/Enseco. Both laboratories utilized AA for the analyses. ' Nickel was reported at various concentrations in all monitoring well samples as measured by P.A. The ICP results confirm the presence of nickel ' in the MW-1 samples. Although it was not detected in the field blank, it was reported in the MW-3 sample (hydrogeologically upgradient well) at a concentration equal to the detection limit of 0.01 mg/L. 57-87-621 7