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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY 2r ' <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health OfficerCI <br /> c .., P <br /> 9FOPN <br /> P.O. Box 2009 (1601 East Hazelton Avenue) Stockton,California 95201 <br /> (209) 468-3400 <br /> October 24 , 1990 <br /> Tim Ross J / u u <br /> Union Oil Company of California <br /> P.O. Box 8175 <br /> Walnut Creek, CA 94596 <br /> RE: Former Unocal IN REPLY REFER TO SITE CODE: 2162 <br /> Station #5098 <br /> 5606 Pacific Ave. <br /> Stockton, CA <br /> Please be advised that this office has reviewed the groundwater <br /> contamination file for the above referenced site. Benzene (130 <br /> toluene (160 <br /> parts per billion (ppb) ) , ethylbenzene (120 ppb) , <br /> ppb) , xylenes (1180 ppb) , 1, 2-dichlorethane (242 ppb) , and total <br /> petroleum hydrocarbons (28, 000 ppb) were detected in groundwater <br /> beneath the site. <br /> On August 10, 1988 , the Central Valley Regional Water Quality <br /> Control Board (CVRWQCB) , approved soil remediation measures and <br /> interim groundwater cleanup on the condition that a problem <br /> assessment report would be completed concurrently. <br /> The Remediation Plan submitted failed to propose complete soil <br /> cleanup, and properly address the contamination plume definition <br /> necessary for complete problem identification prior to remediation <br /> of the site. <br /> Pursuant to the Porter-Cologne Water Quality Control Act, Section <br /> 25297 . 1, you are required to submit a problem assessment work plan <br /> by December 1, 1990. This work plan should include detailed <br /> proposals and time schedules for complete delineation of <br /> groundwater contamination. <br /> Also due by December 1, 1990, is the first round of quarterly <br /> monitoring as outlined in Section 2652 (d) of the Underground <br /> Storage Tank Regulations. These reports are to show the: <br /> A Division of San Joaquin County Health Care Services 0 <br />