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AF&SMA <br /> Working To Restore Nature <br /> LABORATORY ANALYSIS <br /> Groundwater samples were collected after purging the monitoring wells and verifying the <br /> stabilization of pH, electrical conductivity, and temperature. Samples were submitted to Sequoia <br /> Analytical Laboratories in Redwood City, California for analysis of hexavalent chromium (EPA <br /> Method 7196) Hexavalent chromium was present in the samples collected from MW-1, MW-2 <br /> and MW-3 The hexavalent chromium levels present in wells MW-1 and MW-2 were below the <br /> California Primary Maximum Contaminant Level (MCL) for drinking water of 0 05 mg1f. <br /> Analytical results are summarized in Table 2 Laboratory data sheets and chain-of-custody <br /> documentation are provided in Attachment 2 <br /> C ONCLUSI ONS/REC OMMENDATI ONS <br /> Based on a review of previous work performed at this site and the data presented in this report, <br /> it can be concluded that groundwater flow direction is generally consistent with past monitoring <br /> The groundwater samples collected from wells MW-1 and MW-2 continue to contain detectable <br /> concentrations of hexavalent chromium at levels below the California MCL, but the sample from <br /> MW-3 contained a concentration of hexavalent chromium that exceeds the California Primary MCL <br /> by 0 33 mg/1 <br /> iIf you have any questions, please call Greg Stahl at (209) 838-3507 <br /> Respectfully, <br /> RESNA Industries Inc <br /> C�)��4�c <br /> Lois Frantz <br /> Staff Geologist <br /> Gregory P. tahl <br /> CA Registered Geologist <br /> Attachments <br /> PC Mr. Mike Lescisin, Diamond Walnut <br /> Mr Robert Taylor, Tuttle and Taylor <br /> Ms Elizabeth Thayer, CRWQCB <br /> OW05641QUARTLYI2QR-1994 FNL <br />