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r 1� <br /> ERI <br /> • ENVIRONMENTAL RESOLUTIONS, INC. <br /> March 28, 2001 <br /> ERI 205503ER L06 <br /> Mr Ed Ralston C) <br /> Tosco Marketing Company . <br /> 1380 Lead Hill Road, Suite 120 Y, <br /> w� <br /> Roseville, California 95661 <br /> Subject Status of Interim Remedial Activities, Tosca 76 Service Station 5886, <br /> 2701 West March Lane, Stockton, California <br /> Mr Ralston �a <br /> At the request of Tosco Marketing Company (Tosca), Environmental Resolutions, Inc (ERI) has <br /> prepared this document describing the status of interim remedial activities (IRAs) at the subject site <br /> These IRAs include weekly purging of groundwater from the underground storage tank (UST) cavity <br /> well and groundwater monitoring well MW3 The location of the UST cavity well and well MW3 are <br /> shown on the Generalized Site Plan (Plate 1) The purged groundwater is transported to the Tosco <br /> Refinery in Rodeo, California for disposal <br /> The IRAs were initiated at the site during June 2000, following approval of the Corrective Action Plan <br /> (CAP) (ERI, December 28, 1999) by the San Joaquin County Public Health Services, Environmental <br /> Health Division (the County) in a letter dated February 22, 2000 The IRAs were temporarily <br /> suspended in August 2000 pending clarification from the County regarding requirements for sampling <br /> and data evaluation Approximately 46,000 gallons of groundwater were purged from the UST cavity <br /> well and well MW3 during the calendar year 2000 <br /> Tosco resumed IRAs in January 2001, following clarification of the sampling and evaluation <br /> requirements provided by the County in their December 4, 2000 letter (Attachment A) Between <br /> January 24 and February 7, 2001, three groundwater purging events were performed at the site, during <br /> which approximately 15,000 gallons of groundwater were purged from the UST well and well MW3 <br /> The purged water was transported to the Tosco Refinery for disposal During each purging event, <br /> groundwater samples were collected from the UST cavity well and well MW3 both before and after <br /> purging, and a water sample was collected from the purged groundwater <br /> The groundwater and water samples were submitted to Sequoia Analytical Laboratory, Inc (Sequoia) <br /> of Petaluma, California for analysis These samples were analyzed for total petroleum hydrocarbons as <br /> gasoline (TPHg), benzene, toluene, ethylbenzene, and total xylenes (BTEX), oxygenated compounds <br /> methyl tertiary butyl ether (MTBE), tertiary amyl methyI ether (TAME), tertiary butyl alcohol (TBA), <br /> di-isopropyl ether (DIPS), ethanol, and ethyl tertiary butyl ether (ETBE), and lead scavengers <br /> • 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) using the laboratory methods shown in <br /> Table 1 Results of laboratory analysis of the water samples collected from the UST cavity well, well <br /> MW3 and the purged groundwater are summarized in Table 1 The laboratory analysis results for <br /> 73 Digital Drive, Suite 100, Novato, California 94949-5791 415-382-9105 (FAX 415-382-1856) <br /> Lake Forest • Novato • Seattle <br />