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PUBLI HEALTH SER 4CES <br /> SAN JOAQUIN COUNTY z <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P. O. Box 388 • Stockton, CA 95201-0388 ���p6R`' <br /> 209/468-3420 <br /> C (OPY <br /> JIM HESSLER <br /> CONNOLY RANCH INC <br /> PO Box 811 MAY 10 1995 <br /> TRACY CA 95378 <br /> RE: CASTLE ROCK FIRE STATION SITE CODE: 1900 <br /> 34580 CORRAL HOLLOW ROAD <br /> TRACY CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has reviewed the March 8, 1995 "Preliminary Site <br /> Assessment Report" prepared by Tetra Tech, Inc. for the above <br /> referenced site. <br /> The report provides a brief history of the site, a description of <br /> the site investigation, a presentation of analytical results and <br /> conclusions and recommendations based upon the data. <br /> The report states that toluene at 4 .2 ppb and non detectable <br /> organic lead found during the investigation coupled with the <br /> concentrations reported during the UST removal, indicate that no <br /> significant impact from the diesel UST has occurred, and no further <br /> assessment or remedial action at the site appears warranted at this <br /> time. Tetra Tech recommends closure. <br /> The PHS/EHD letter of January 30, 1995 states that a WET test shall <br /> be performed if the result of laboratory analysis for lead is <br /> greater than 10 times the STLC. Title 22, Division 4, Article 11, <br /> Section 66699 of the California Code of Regulations states that the <br /> STLC and the TTLC values are calculated on the concentrations of <br /> the elements not the compound. Organic lead is a compound. The <br /> laboratory analyses for organic lead used during this investigation <br /> are inconclusive for the presence or absence of elemental lead in <br /> the former UST location or the stockpile. <br /> The downgradient hydropunch HP2-W confirms the presence of toluene <br /> at a concentration of 4 .2 ppb which is 13 times the detection limit <br /> of .3 ppb in groundwater. This detection requires further <br /> investigation to determine if the toluene is residual from the UST <br /> removal, or, the hydropunch was located at the edge of a larger <br /> downgradient plume. <br /> A Division of San Joaquin County Heaith Care Services <br />