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i <br /> I <br /> ADDITIONAL SUBSURFACE INVESTIGATION � <br /> 102 SOUTH WILSON WAY <br /> STOCKTON, CALIFORNIA <br /> i <br /> 1.0 INTRODUCTION <br /> In accordance with our workplan, approved by the San Joaquin County <br /> Environmental Health Division (SJCEHD) , Mill Creek Associates (MCA) <br /> performed additional subsurface investigation at the Roek Bothers <br /> property located at 102 South Wilson Way in Stockton, California <br /> (Figure 1) . The purpose of the additional subsurface investigation <br /> was to further evaluate the extent of petroleum hydrocarbons in <br /> soil and groundwater on-site and off-site. <br /> work included drilling one on-site and one off-site soil boring, <br /> constructing monitoring wells in the borings, collecting and <br /> analyzing soil and groundwater samples, evaluating new and existing <br /> data, and preparing this report. <br /> 2.0 BACKGROUND <br /> i <br /> 2 . 1 Site Description/History <br /> The site is located at 102 South Wilson Way on the Southeast corner <br /> of Wilson Way and Market Street in Stockton, California as shown on <br /> the Site Vicinity Map (Figure 1) . The site is flat and at <br /> elevation of approximately 18 feet above mean sea level. The <br /> property was formerly occupied by a gasoline service station and a <br /> bottling facility. Petroleum hydrocarbons have been stored on the <br /> site since at least 1950. Service stations were also located on <br /> the other three corners of the Wilson Way/Market Street <br /> intersection in the past. <br /> 2 .2 Previous Work <br /> In December 1978, two 7, 500--gallon gasoline underground storage <br /> 4 tanks (USTs) and product piping were removed from the site. After <br /> removal of the USTs, the excavation was backfilled to grade and <br /> paved. Permits for removal of the USTs are on file with the City <br /> of Stockton Fire Prevention Bureau (Kennedy/Jenks, October 21, <br /> 1992) . <br /> In April 1988, Balbi & Chang Associates (Balbi & Chang) conducted <br /> an initial site assessment without contacting or obtaining permits <br /> from the San Joaquin County Public Health Services. Subsequently, <br /> the initial site assessment had to be repeated. This initial <br /> assessment consisted of drilling three soil borings (TB-1 through <br /> TB-3) . Balbi and Chang reported detectable concentrations of total <br /> 1 <br /> � I <br />