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WORK PLAN FOR <br /> INITIAL SUBSURFACE INVESTIGATION OF <br /> PETROLEUM HYDROCARBONS <br /> SITE NO. 4 (SITE CODE 1282-10) <br /> PORT OF STOCKTON <br /> Near Port Roads 21 and K <br /> Stockton, San Joaquin County, California <br /> 1.0 INTRODUCTION <br /> L This work plan has been prepared'by Boyajian & Ross,. Inc. (B&R) at the request of Mr. Jay <br /> Jahangiri, Director of Environmental and Regulatory Affairs of the Port of Stockton (Port). <br /> The Port removed an underground storage tank (UST) at this site (Figure 1) on July 15, 1991. <br /> Analyses of a soil sample collected from beneath the tank indicated detectable levels of <br /> petroleum hydrocarbon compounds (PHCs). Based on these findings, a "Notice of <br /> Responsibility" was issued to the Port by San Joaquin County Public Health Service, <br /> Environmental Health Division (PHS/EHD) on March 25, 1998. The letter accompanying the <br /> Notice requested a work plan to investigate the lateral and vertical extent of contamination at <br /> the site. This work plan is in response to that request. <br /> L 2.0 SITE BACKGROUND <br /> This section presents the site description, summarizes previous characterization work, and <br /> briefly summarizes the geologic and hydrologic characteristics of the site. Copies of pertinent <br /> background documents, such as the "Notice of Responsibility," the PHS/EHD "Tank <br /> Closure/Abandonment Inspection Report," the tank removal contractor's notes, and the <br /> analytical laboratory results, are included in Appendix A. <br /> 2.1 SITE DESCRIPTION <br /> The site is located in the southeast portion of the Port of Stockton complex, about 1,000 feet <br /> south of Washington Street and 400 feet east of Port Road 21 (Figure 2). The site is identified <br /> 1 9em+s�ausrnvv.wrN <br /> ]MtB4YAJIAN & ROSS, INC. <br /> Fnvironmental Scientists & Engineers <br />