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• ER! <br /> ENVIRONMENTAL RESOLUTIONS, INC. <br /> August 21, 1997 <br /> ERI 205513 QS I <br /> Mr Ronald Rowe, Sr <br /> Site Mitigation Unit <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Subject Update Quarterly Summary Report for Environmental Investigation at Unocal Service <br /> Station 5886, 2701 March Lane, Stockton, California <br /> Mr Rowe <br /> At the request of Tosco Marketing Company (Tosco), and pursuant to correspondence from San <br /> Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) dated July 24, <br /> 1997, Environmental Resolutions, Inc (ERI) is submitting this update quarterly summary report for <br /> the subject site <br /> • BACKGROUND <br /> The site is immediately west of Interstate 1-5 on the northwestern corner of March Lane and the I-5 <br /> offramp in Stockton, California, as shown on the Site Vicinity Map (Plate 1) The locations of <br /> existing underground storage tanks (USTs), dispenser islands, and other selected site features are <br /> shown on the Generalized Site Plan (Plate 2) Properties in the vicinity of the site are generally <br /> occupied by commercial developments <br /> Unocal Corporation purchased the land in 1967, at which time the property was vacant In 1982, <br /> Unocal constructed a service station at the site and installed three 12,000-gallon UST's to store <br /> gasoline and diesel fuels (Delta Environmental, February 6, 1996) <br /> Between July 1995 and September 1996, Unocal replaced the original UST's and associated product <br /> distribution lines, enlarged the existing tank pit to accommodate three new 15,000-gallon UST's, <br /> advanced 21 soil borings and collected soil and groundwater samples from the borings utilizing a <br /> geoprobe sampling system, and drilled four additional soil borings and constructed groundwater <br /> monitoring wells in three of these borings The location of existing wells are shown on Plate 2 <br /> Unocal initiated quarterly groundwater monitoring during December 1996 Data collected by others <br /> indicate the groundwater flow direction ranged from northwest to west and the groundwater surface <br /> was approximately 7 to 8 feet below ground surface (bgs) Concentrations of total petroleum <br /> hydrocarbons as gasoline (TPHg) and benzene, toluene, ethylbenzene, and total xylenes (BTEX) were <br /> . not detected in groundwater except for 6 parts per billion (ppb) of xylenes detected in well MW2 <br /> 74 Digital Drive, Suite 6,Novato, California 94949 415-382-9105 (FAX 415-382-1856) <br /> Lake Forest - Novato - Seattle <br />