ARCHIVED REPORTS XR0003279 - Laserfiche WebLink

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tes STCeraSu Inc 1 t [' Lune Palm avnteenue butte B CVv ` ATC Modesto California q43 a 1 209-579-22-21 A S S 6 C ! A T E S I N C Fax 209-579-22'-5 9) to 890 mgrL (MW-3) Calcium in the groundwater samples collected from YIW-I through MW-9 ranged frorn 75 rng/L (MW-4) to 330 mg-/L (MW-3) Muminum was detected In the groundwater samples collected from wells b1W-4 and \([W-'l at concentrations above the Califorrua Primary MCL Chloroform was detected in 1v1W-1 through 1/1W-9 at or above laboratory detection limits but below the California Primary MCL During the review of data from the previous quarter_ an error was noted Chloroform data submitted in the first quarter was reported in micrograms per liter (µgel) instead of milligrams per liter (mg/1) Table ? has been corrected to reflect lab data results in the appropriate units Trichlorofluoromethane was detected in MWI above laboratory detection limits. but below the California Primary MCL Acetone was also detected in MWI above laboratory detection limits Currently there is no California Primary MCL established for acetone Analytical results are summarized in Table ? Laboratory data sheets and chain-of-custody documentation are provided in Attachment DISCUSSION AND CONCLUSIONS Based on a review of previous work performed at this site and the data presented in this report, it can be concluded that the groundwater gradient direction on April 19, 2005 is generally consistent with historical data • The groundwater samples collected from monitoring wells MW-1 through N[W-9 contained concentrations of Cr `b at levels above the Iaboratory method detection limit Only the samples collected from wells MW-3 and MW-6 contained Cr +6 concentrations in excess of the California Primary MCL for Cr 6 The Cr `6 concentration in the samples collected from MW-3 decreased and MW-6 increased since the last monitoring event Groundwater samples collected from MW- 1 through MW-9 each contained total chromium at or above the laboratory detection limit Onlv MW3 and MW-6 were detected to have total chromium above the Califorrua Primary MCL MWI also was detected to have trichlorofluoromethane and acetone present at or above laboratory detection Iimits, but not above the California Primary MCL No trichlorofluoromethane or acetone were detected in groundwater samples collected from MW? through MW9 • S 1envlronmental1625831quarterlyllgr-2005 doe 3