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low <br /> 10 May 2000 <br /> AGE-NC Project No. 99-0641 <br /> City of Stockton <br /> Municipal Service Center <br /> 1465 South Lincoln Street <br /> Stockton, CA 95203 <br /> Subject: Preliminary Subsurface Investigation Report <br /> Stockton Municipal Service Center <br /> 1465 South Lincoln Street, Stockton, California <br /> Dear Mr. Giottonini: <br /> At your request, Advanced GeoEnvironmental, Inc. (AGE) performed a preliminary subsurface <br /> investigation of the referenced facility by advancing and sampling two soil probe borings in the <br /> general vicinity of the underground storage tanks (USTs). The purpose of the investigation was to <br /> assess soil and ground water for the presence of petroleum hydrocarbons. <br /> The location of the site is illustrated on Figure 1. A plan view of the site, showing prominent <br /> structures and sampling locations, is illustrated on Figure 2. The borings were located as indicated <br /> on the site map included in the Request for Bids provided by the City of Stockton and as shown in <br /> the San Joaquin County Public Health Services - Environmental Health Department (PHS-EHD)- <br /> approved, AGE-prepared PreNminary,Site Assessment Work Plan -Municipal Service Center dated <br /> 17 January 2000. <br /> BACKGROUND <br /> The site is located at 1465 South Lincoln Street in Stockton, California (Figure 1). The property is <br /> located in an industrial and commercial area of southern Stockton. The property is presently <br /> occupied by the City of Stockton Municipal Service Center, which consists of three one-story <br /> structures housing an office, maintenance garage, lunchroom, miscellaneous shops. Formerly, a <br /> fueling facility consisting of two dispenser islands with four gas dispensers and three USTs were on <br /> the site. <br /> On 21 April 1995, one 12,000-gallon unleaded gasoline UST, one 12,000-gallon leaded gasoline <br /> UST, and one 12,000-gallon diesel UST were removed from the site. Soil samples were collected <br /> from beneath each former UST location and from the excavated soil. The samples were transported <br /> to a DHS-certified laboratory and selected samples were analyzed for total petroleum hydrocarbons <br />