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ZCv <br /> ATC <br /> A 8 S O C I A T E S I N C <br />' Analytical results are summarized in Tables 2 and 3 Laboratory data sheets and chain-of- <br /> custody <br /> hain-ofcustody documentation are provided in Attachment 2 <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 April 20, 2004 is generally <br /> consistent with historical data <br /> The groundwater samples collected from monitoring wells MW-1, MW-2, MW-4, MW-5 and <br /> wells 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 total chromium The hexavalent <br /> chromium concentration in the sample collected from MW-3 increased slightly since the last <br /> monitoring event, and the hexavalent chromium concentration in the sample collected from MW- <br /> 6 decreased slightly since the last monitoring event Hexavalent chromium was not detected <br /> above the laboratory detection limit in the water sample collected from the inactive facility well <br /> during this and 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 /> Todd Hafnert `•' <br /> Project GeologistL <br /> ..' <br /> k I. O <br /> �Homsey, P E � ,1 <br /> ,, <br /> CA Registered Civil Engineer No C 47410 }��yi�4'a `'lv zea• <br /> Attachments <br /> PC Mr Mike Lescisin, Diamond Walnut <br /> Ms Margaret Lagono, San Joaquin County EHD <br /> Mr Ed Formosa, City of Stockton, DMU <br /> S%environmental1625831quarterlyl2gr-2004 doc 3 <br />