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Ifi <br /> - n <br /> Franklyn Cole <br /> Page 2 <br /> vapor extraction data obtained. Once vapor extraction no longer appears to be effective, <br /> confirmation soil sampling or some other method of evaluation should be used to show <br /> that clean-up levels have been achieved. Although the highest levels of contamination <br /> exist in clay soil from 18 fbg to surface, there are high levels of contamination in gravel <br /> from 18 fbg to 25 fbg, with lower levels of contamination extending to 40 fbg in gravel. <br /> PHS/EHD anticipates that vapor extraction should accomplish major reductions of the <br /> contamination in the hfirst 6 months of operation. . <br /> There are errors in the December 1995 CAP that should be corrected. On page 3, when <br /> discussing the results of the soil samples, it should state that benzene was detected in <br /> sample VE1-15 at 416 ppm and xylene was detected .in sample VEl-15 at 2000 ppm. <br /> Also the boring log for VE1 should show a total depth of 40 feet instead of 35 feet. <br /> The quality assurance and quality control data from the laboratory for the soil samples <br /> collected in October 1995 were not included in the December 1995 CAP. Please include <br /> this information in the next report submitted to PHS/EHD. <br /> A revised CAP or a, closure report following Central Valley Regional Water Quality <br /> Control Board guidelines, that addresses the above comments, should be submitted to <br /> PHS/EHD by June 10, 1996. <br /> i <br /> I have enclosed a PHS/EHD customer service survey. Please consider filling it out and <br /> returning it to our office. If you have any questions please contact me at (209) 468- <br /> 3449. <br /> Donna Heran, RENS; Director <br /> Environmental Health'-Division <br /> Margaret Lagorio, Lead Senior REHS <br /> Site Mitigation Unit <br /> Y <br /> c: Advanced GeoEnvironmental, Inc. <br /> c: SWRCB Cleanup Fund - George Lockewood <br /> c: CVRWQCB - Betli' Thayer <br /> Enc. i <br /> w <br />