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v <br /> 4 <br /> ATC <br /> A S S O C I A T E S I N 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 October 22, 2003 is generally <br /> consistent with historical data <br /> The groundwater samples collected from monitoring wells MW-2, MW-4, MW-5, MW-7, MW- <br /> 8, and MW-9 contained concentrations of hexavalent chromium at levels above the laboratory <br /> method detection limit but below the California Primary MCL for total chromium Only the <br /> samples collected from wells MW-3 and MW-6 contained hexavalent chromium concentrations <br /> in excess of the California Primary MCL for total chromium The hexavalent chromium <br /> concentrations in the samples collected from MW-3 and MW-6 increased slightly since the last <br /> monitoring event Hexavalent chromium was not detected above the laboratory detection limit in <br /> the water sample collected from the inactive facility well during this and previous sampling <br /> events <br /> If you have any questions, please contact our office at (209) 579-2221 <br /> Respectfully Submitted, <br /> ATC Associates Inc <br /> Vim <br /> oi <br /> Todd Hafner <br /> Project Geologists} 'l`. <br /> M Ell <br /> Jeanne Homsey, P E <br /> CA Registered Civil Engineer No C 47410 <br /> Attachments <br /> PC Mr Mike Lescisxn, Diamond Walnut <br /> Ms Margaret Lagono, San Joaquin County EHD <br /> Mr Ed Formosa, City of Stockton, DMU <br /> i <br /> s lenvironmenta11625831quarterlyl4gr-2003 doc 3 <br />