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I Site Assessment Report - September 1997 ' PIE Nationwide 2007 North Wilson Way, Stockton, California ' 1.0. INTRODUCTION ' In accordance with the request of Mr Shanaibhai Ranchhod, Advanced GeoEnvironmental, Inc (AGE) has prepared this Site Assessment Report (SAR) for 2007 North Wilson Way, Stockton, California (the site) The scope of work for this investigation was to test for and assess the impact of petroleum hydrocarbons beneath the underground storage tank (UST) and dispenser island area at the site The scope of work for this site assessment included advancement of two soil borings, collection of both soil and ground water samples for laboratory analysis, and preparation of this report The location of the site is illustrated on Figure I - Location Map The locations of structures and borings on the site are illustrated on Figure 2 - Site Plan The investigation was performed in accordance with the guidelines of both the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD) and the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites 2.0. BACKGROUND 2 1 INITIAL INVESTIGATION IIt is our understanding that one 15,000-gallon underground storage (UST) utilized for diesel fuel was removed from the site in August 1991 Total petroleum hydrocarbons quantified as diesel (TPH-d) I and volatile aromatics (benzene, toluene, ethylbenzene and xylenes BTEX) were detected in soil samples collected from the floor of the excavation following the UST removal It is AGE's understanding that the soil sample from the south end of the tank pit did not contain detectable concentrations of petroleum hydrocarbons On 14 May 1997, two soil probe borings (P-1 and P-2) were advanced to 25 feet and 50 feet below surface grade (bsg), respectively, near the former UST and dispenser island area at the site Total petroleum hydrocarbons quantified as diesel (TPH-d) were detected in soil samples collected from P-I at a depth of 20 feet bsg, and from P-2 at depths between 25 and 50 feet bsg Analytical results of soil samples collected during the initial investigation are summarized in Table I - Analytical Results of Soil Samples Soil probe borings P-I and P-2 are depicted in Figure 2 22 REGIONAL GEOLOGIC SETTING According to the Geologic Map of California, published in 1977 by the State of California Department of l/lines and Geology, the site area is within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending structural trough The Great Valley Province has Advanccd Ceolnviroiwiental,Inc