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Uwe <br /> GROUND ZERO ANALYSIS, INC. 4t _ <br /> a � <br /> 1714 Main Street <br /> Escalon, California 95320 ENVIRONMENTAL HEALTH DIVISION APR 2 ? +v <br /> Telephone: (209) 838-98 304 E. Weber Ave.Third Floor . Nfvf�" 4 <br /> Facsimile: (209)838-9 P. O. Box 388, Stockton CA 95201-0388 <br /> Approved 1 >F(�U YLS <br /> Denied ❑ 4--- <br /> onditio me s • <br /> April 20, 1999 Date 4, - - by <br /> Ms. Carol Oz <br /> San Joaquin County Public Health Services 6 <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor 4C <br /> Stockton, CA 95202 /0 it, <br /> Subject: Workplan for Subsurface Investigation <br /> Delta Air Strip <br /> 15971 N. Tracy Blvd., Tracy California <br /> Site Code: 2452 <br /> Dear Ms. Oz: <br /> This letter report is submitted to present a proposed workplan to conduct a subsurface investigation <br /> at the subject site (Figure 1). In correspondence dated February 9, 1999, San Joaquin County Public <br /> Health Services, Environmental Health Division (PHS/EHD) requested a workplan be submitted by <br /> April 20, 1999 to investigate the vertical and lateral extent of residual contamination. <br /> The general scope of work will consist of drilling and sampling three soil borings in the vicinity of the <br /> former underground storage tank (UST) to investigate the vertical and lateral extent of residual soil <br /> contamination, collecting a discrete groundwater sample to determine if groundwater has been <br /> impacted, and preparing a technical report that summarizes the methods and results of the <br /> investigation. <br /> BACKGROUND <br /> The site is currently operated as an aerial agricultural chemical application service. The facility <br /> previously utilized one 10,000-gallon UST for storage of aviation fuel (Figure 2). The UST was <br /> removed under permit from PHSIEHD on May 16 1990. A soil sample collected beneath the tank, <br /> and a water sample collected from the UST excavation contained petroleum hydrocarbons at levels <br /> exceeding the respective laboratory detection limits. Analytical results are summarized in Table 1. <br /> Groundwater beneath the site is expected to be encountered at approximately 8 feet below ground <br /> surface (bgs). However, the depth to groundwater and flow direction may be influenced by tidal <br /> activity. <br /> 4ata/groundze/ba1ey/wp0399.doc <br />