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L '-4 1--41_ <br /> GROUND ZERO ANALYSIS, INC. <br /> J. <br /> 1714 Main street Ll- ;- PH 1: 26 <br /> F,scalon, California 95320 <br /> Telephone: (209) 838-9888 <br /> Facsimile: (2091`$38-9883 <br /> December 3, 1999 <br /> :i <br /> Ms. Lori Duncan <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> 1 <br /> Subject: Workplan for Subsurface Investigation <br /> Tuff Boy Trailers, 5151 Almondwood Drive,Manteca, CA <br /> Dear Ms. Duncan: <br /> ,3 <br /> This letter report is submitted to present a proposed workplan to conduct a subsurface investigation <br /> at the subject site (Figure 1). The investigation was requested by San Joaquin County Public Health <br /> Services, Environmental Health Division (PHS/EHD) in correspondence dated May 13, 1999. <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 /> 3I <br /> The site previously utilized one 1,100-gallon UST for storage of unleaded gasoline (Figure 2). The <br /> UST was removed under permit from PHS/EHD on Febivary 5, 1999. Soil samples collected <br /> beneath the tank contained ethylbenzene and total xylenes atl levels exceeding the respective <br /> laboratory detection limits. Analytical results are summarized in Table 1. Groundwater beneath the <br /> site is expected to be encountered at approximately 10-12 feet below ground surface (bgs). <br /> SCOPE OF WORK <br /> Ground Zero will supervise the drilling and sampling of three soil borings in the vicinity of the former <br /> UST. One boring will be placed in or near the center of the"forme'r UST excavation, one boring will <br /> be placed approximately 20 feet northwest of the former UST, and one boring will be placed <br /> 1 data/groundzehuffboy/wp 1199.doc <br /> ' j <br />