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OV4%Tc <br /> � <br /> ASSOCIATES I N C . <br /> The groundwater samples collected from monitoring wells MW2, MW4, MWS MW <br /> MW8 contained concentrations of hexavalent chromium at levels above the laboratory method <br /> 7, arid <br /> detection limit but below the California Primary MCL. Only the sample collected from MW3 <br /> and MW6 contained hexavalent chromium in excess of the California Primary MCL. The <br /> hexavalent chromium concentration in the sample collected from monitoring well MW3 has <br /> decreased slightly since the last monitoring event. The hexavalent chromium was not detected <br /> during this and previous sampling events. <br /> above laboratory detection limits in the water sample collected from the former facility well <br /> I <br /> If you have any questions,please contact our office at(209) 579-2221. <br /> Respectfully Submitted, <br /> ATC Associates Inc. <br /> Jo Sellman <br /> Staff Geologist � � E <br /> t � M <br /> r , <br /> eanne Hornsey, P. E. <br /> CA Registered Civil Engineer No. C 47410 <br /> Attachments . <br /> PC: Mr. Mike Lescisin, Diamond Walnut <br /> Ms. Margaret Lagorio, San Joaquin County EHD <br /> Mr. Ed Formosa, City of Stockton, DMU <br /> N <br /> i <br /> i <br /> w:1625831quart1yl1gr-2003.doc 3 <br />