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PUBLIC HEALTH SERVICES oPa��N <br /> SAN JOAQUIN COUNTY P <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> c4< Foa��P <br /> P.O. Box 2009 . (1601 East Hazelton Avenue) Stockton, California 95201 <br /> (209) 468-3400 <br /> January 3 , 1991 <br /> Mr. Clint Rogers <br /> 0 Fly <br /> Chevron U. S.A. , Inc. <br /> P.O. Box 5004 <br /> San Ramon, CA 94583-0804 <br /> RE: Chevron Service Station#9-6171 REFER TO SITE CODE: 1784 <br /> 6633 Pacific Avenue <br /> Stockton, CA <br /> Public Health Services, Environmental Health Division (PHS/EHD) has <br /> reviewed the subsurface investigation prepared by Sierra <br /> Environmental Services (SES) and received November 17, 1990. The <br /> following comments are based on this report and the file for the <br /> above referenced site: <br /> 1. The file indicates that MW #1 has been sampled since the <br /> December 10, 1986 event and prior to the January/March <br /> 1990 attempts, when there was insufficient water in the <br /> well . PHS/EHD would like to have copies of any lab <br /> results collected at this site. To update future review, <br /> please forward these as soon as possible. <br /> 2 . The file further shows that on August 20, 1990, Sierra <br /> Pacific Drilling installed MW #5 without notifying this <br /> office of their intent to work on Sunday. One of our <br /> off-duty staff members observed and noted sealed soil <br /> samples sitting in the sun rather than in an ice chest, <br /> PHS/EHD will not recognize any mishandled samples as <br /> representative of subsurface conditions. <br /> 3 . Table 3 Analytic Results for Soil, indicated B, T, X, and <br /> E below . 01, . 015, . 015, and . 015 parts per million (ppm) <br /> respectively, yet the certificates of analysis state they <br /> were "not analyzed" in the MW-5-10 . 5 ' and MW-5-15. 5 ' <br /> samples. (Please see Table 2 , Page 17 , of the Tri- <br /> Regional Board Staff Recommendations (10 August 1990) for <br /> recommended minimum verifications analyses under waste <br /> and used oil or unknown. ) <br /> 4 . The detection limits for the soil samples are a factor of <br /> 10 too high and the total lead water samples 500 times <br /> too high. Future reports should contain analysis that <br /> follow the Tri-Regional Board Staff Recommendations and <br /> LUFT Manual guidelines detection limits as well as proper <br /> constituents . <br /> A Division of San Joaquin County Health Care Services <br />