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The former AST area is close to the drinking water supply well for this site. <br />Analytical results of a water sample from the drinking water well indicate the <br />presence of benzene at a concentration of .6 ppb. The maximum concentration <br />allowed by the California Code of Regulations, for benzene, in drinking water <br />supplied to the public is 1 ppb. The well also contains ethyl benzene, xylenes <br />and total extractable petroleum hydrocarbons. <br />Motor Oil has been detected in the soil beneath the waste water sump and diesel <br />has been detected in the storm water retention pond. <br />PHS/EHD provides oversight for the investigation and remediation of <br />contaminated petroleum fuel UST sites, however, data from this investigation <br />indicate that an AST release contributed most of the contamination found at this <br />site. In addition there is contamination associated with the use of the waste <br />water sump and the storm water retention pond. Therefore PHS/EHD has <br />referred this site to the Central Valley Regional Water Quality Control Board <br />(CVRWQCB) for additional oversight. <br />For additional information please contact Steven Sasson or Margaret Lagorio at <br />(209) 468 - 3420. <br />Donna Heran, Director <br />Environmental Health Division <br />x�f � <br />Steven Sasson. REHS <br />cc: Wendy Cohen, CVRWQCB SLIC <br />cc: Gail Wigget, CVRWQCB AST <br />Margaret Lagorio, REHS <br />Supervisor <br />