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1.0 Introduction <br /> IT Corporation (IT) was retained by Pacific Bell in September 1993 to generate a work plan <br /> for supplemental investigation, surrounding the former underground tank location, on their site <br /> No. UE132, located in Stockton, California. Generation of the work plan was required by <br /> San Joaquin County Public Health Services - Environmental Health Division guidelines, to <br /> address the migration of diesel fuel in soil beneath former fuel tank removed in April 1988. <br /> The work plan procedures, designed to assess site soil and groundwater quality, were <br /> implemented in October 1993. The following report discusses field procedures, results, <br />' conclusions and recommendations based on the investigative results. <br />' 1.1 Site Location <br /> Pacific Bell facility UE132 is located at 7644 Ashley Lane in Stockton, California (Figures 1 <br /> and 2). The site hes approximately 2 miles east of Highway 99, and approximately 1.5 miles <br /> north of Highway 88. The site is located in the Waterloo 7.5-minute USGS topographic sheet <br /> and is situated at approximately 48 feet above mean sea level and is essentially flat. Ground <br />' elevations increase very little within several miles of the site. <br /> 1.2 Site Description <br /> Pacific Bell facility UE132 consists of a single story building and a fenced asphalted yard on <br /> ' the northeast side of the building. The facility is an unmanned switching terminal. The <br /> facility is located in a rural area of San Joaquin County. The properties surrounding the site <br /> are agricultural in nature. <br /> A water well is located approximately 50 feet south of the former UST location and is used <br /> by Pacific Bell in their facility operations. The well is reportedly 150 feet deep and draws <br /> water from an aquifer 135 feet bgs. <br /> 2.0 Field Procedure <br /> IT performed a supplemental investigation at Pacific Bell Facility UE132 on Ashley Lane in <br /> Stockton, California in order to further characterize soil quality, and evaluate remedial action <br /> success adjacent to the former underground storage tank location. The investigation had the <br /> following goals: <br /> MZJ12-08-931ENG/93-1065.nbr <br /> 1 <br />