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GROUND ZERO ANALYSIS,INC. <br /> 1714 Main Street <br /> Escalon,California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> August 22, 2001 <br /> j Mr. Samuel Savig <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br />� Stockton, CA 95202 <br /> E y <br /> Subject: Workplan for Groundwater Monitoring Well Installation i <br /> Souza II, LLC, 612 West 11`h Street, Tracy, California <br /> Site Code: 0001283 <br /> Dear Mr. Savig: <br /> f <br /> E�. <br /> This letter report is submitted to present a proposedl workplan to conduct a subsurface <br /> investigation at the subject site (Figure 1). The investigation_was requested by San Joaquin County <br /> Public Health Services, Environmental Health Division (PHS/EHD) in correspondence dated <br /> August 7, 2001. <br /> The general scope of work will consist of drilling and sampling three soil borings in the vicinity of <br /> the former underground storage tanks (USTs) to investigate the vertical and lateral extent of <br /> residual soil contamination, converting the borings into' groundwater monitoring wells and <br /> collecting a groundwater samples to investigate the extent of groundwater contamination, and <br /> preparing a technical report that summarizes the methods and results of the investigation. <br /> ;s <br /> BACKGROUND INFORMATION <br /> a <br /> Two previously unidentified USTs were discovered during earthmoving activities at the subject site <br /> in June 2001. The location of the USTs are shown on Figure 2. The USTs were removed under <br /> permit from PHS/EHD on June 11 and June 15, 2001. Soil samples collected beneath the tanks <br /> contained low levels of gasoline constituents, including ethylbenzene, total xylenes, and total <br /> petroleum hydrocarbons as gasoline (TPHg). Groundwater was present in the bottom of the tank <br /> excavation, and groundwater samples contained elevated levels of gasoline and kerosene <br /> constituents. Analytical results are summarized in Table�11. Groundwater beneath the site is <br /> expected to.be encountered at approximately 7-10 feet below ground surface (bgs). <br /> PROPOSED WORK PLAN <br /> The following scope of work is proposed to evaluate the nature and extent of soil and groundwater <br /> contamination beneath the site: <br /> G:Tata1GROLTNDZEITHORPE\Souza\W PMWS.doc <br /> �f <br /> f <br />