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). H. KLEINFELDER & ASSOCIATES File : W-2001-1 January 29, 1986 Page 23 602. The analytical results for metals were below detection limits for all constituents except arsenic at 0.002 to 0.003 mg/1 , barium at 0.21 mg/1 in monitoring well No. 1 , total chromium at 0.08 mg/l in monitoring well No. 1, and zinc at 0.02 mg/l in monitoring well No. 1 . All values for metals analyses were below State drinking water standards except for total chromium in monitoring well No. 1. The STate drinking water standard for total chromium is 0.05 mg/1. The chemical results for samples from monitoring well No. 1 for purgeable hydrocarbons using EPA Method 624 and acid and base-neutral extractable hydrocarbons using EPA Method 625 were below detection limits. 6 . Information inferred from the major ion analyses indicates the monitoring wells are completed in the same aquifer. The results also indicate the ground water around the wells is of good quality. 7 . The major ion analyses indicate the the downgradient wells have higher concentrations of major ions than the upgradient well . This may be an impact the the pond. The downgradient major ion values do not exceed any State drinking water standards or action levels. The significance of the major ion analyses will have to be determined by the WQCB . 8 . Review of the quality assurance analytical data indicates good correlation between samples and respective blind duplicates. The field blanks were below or near detection limits for all constituents . 9 . Based on water levels measured on December 10 , 1985 , the uppermost water zone apparently flows in a southeast direction. The apparent gradient is approximately 20 feet per mile beneath the study area, which is nearly flat .