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CvvATC <br /> A S S O C I A T E S I IN C <br /> DISCUSSION AND CONCLUSIONS <br /> Based on a review of previous work performed at this site and the data presented in this report, it <br /> can be concluded that the groundwater gradient direction on January 21, 2004 is generally <br /> consistent with historical data <br /> The groundwater samples collected from monitoring wells MW-2 through MW-5 and wells <br /> MW7 through MW9 contained concentrations of hexavalent chromium at levels above the <br /> laboratory method detection limit but below the California Primary MCL for total chromium <br /> Only the samples collected from wells MW-3 and MW-6 contained hexavalent chromium <br /> concentrations in excess of the California Primary MCL for hexavalent chromium The <br /> hexavalent chromium concentrations in the samples collected from MW-3 decreased slightly <br /> since the last monitoring event Hexavalent chromium was not detected above the laboratory <br /> detection limit in the water sample collected from the inactive facility well during this and <br /> previous sampling events <br /> If you have any questions, please contact our office at (209) 579-2221 <br /> Respectfully Submitted, <br /> ATC Associates Inc <br /> • <br /> Nathan Christman <br /> Staff Geologist <br /> Jeanne Homsey, P E z o <br /> CA Registered Civil Engineer No C 47410 , _ <br /> Attachments '` ' <br /> PC Mr Mike Lescisin, Diamond Walnut <br /> Ms Margaret Lagono, San Joaquin County EHD <br /> Mr Ed Formosa, City of Stockton, DW <br /> s lenvironmenta11625831quarterlyllgr-2004 doe 3 <br />