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PUBLIC""HEALTH SERVICES �.rN <br /> SAN JOAQUIN COUNTY <br /> r.= <br /> ENVIRONMENTAL HEALTH DIVISION y <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer •- <br /> 304 E.Weber Ave., 3rd Floor • P. O. Box 388 • Stockton, CA 53D1 03851 r- iV coq• CP <br /> 209/468-3420 <br /> ERIC JOHNSON <br /> �,� OCT 1 7199r <br /> TECHNICAL AND ECOLOGICAL SERVICES <br /> 3400 CROW CANYON RD <br /> SAN RAMON CA 94583 <br /> RE: PG&E Tracy Service Center SITE CODE: 1407 <br /> 502 East Grant Line Road <br /> Tracy, CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has reviewed the August <br /> 7, 1995 Second Quarter 1995 Groundwater Monitoring Report prepared by Smith Environmental for the above <br /> referenced site and your August 24, 1995 letter. <br /> Monitoring well OW2 is down gradient of the former tank location and has evidenced groundwater contamination <br /> sporadically since April 1989. The level of contamination in this well is Iower now than when it was installed in <br /> 1989. For the past two quarters the well sampling results have been ND for TPH-g and BTEX. <br /> The results from the soil samples collected at the time the tank was removed have never been submitted to <br /> PHS/EHD and the condition of the soil returned to the tank excavation is not known. <br /> It appears that a resolution to long term monitoring may be close at hand. If the residual soil contamination is not <br /> a threat to groundwater quality then closure could be considered. If residual soil contamination is a threat to <br /> groundwater quality then PHS/EHD recommends that you over excavate and remove all contaminated soil and <br /> perform confirmatory ground water sampling for a quick resolution to the contamination problem which currently <br /> exists at this site. <br /> A work plan for the investigation and possible over excavation and confirmatory groundwater sampling of the <br /> former UST location should be submitted to this agency by November 15, 1995. <br /> For additional information, please contact Steven Sasson at (209) 468-3459. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Steven Sasson, eniorEHS Diane M. Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> SS <br /> A Division of San Joaquin County Health Care Services <br />