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PRELIMINARY INVESTIGATION AND EVALUATION REPORT Nomellini Construction Company 939 West Charter Way Stockton, CA December 1994 1.0 INTRODUCTION .J In accordance with a request from Nomellini Construction Company (NCC), Geological Audit Services, Inc. (GeoAudit) has drilled one soil boring at 939 West Charter Way in Stockton, California (the site). The investigation was performed at the direction of the San Joaquin County Public Health Services - Environmental Heath Division (PHS/EHD). The purpose of the investigation was to assess if impacted soil is present at the site. This report describes the activities performed in December 1994 and presents the results of this investigation. The location of the site is illustrated in Figure 1. A plan of the site is illustrated in Figure 2. 2.0 BACKGROUND 2.1 Site Location The site is located in a flat industrial area of southwest Stockton in San Joaquin County, California. Specifically, the site is located on the northwest corner of the int;:rsection of West Charter Way and Navy Drive (Figure 1). Interstate. 5 is located approximately 1.5 blocks east of the site. 2.2 UST Removal It is our understanding that one 1,000-gallon regular gasoline underground storage tank (UST) was removed from the property in May 1989. Petroleum hydrocarbon odors and soil discoloration were noted during tank removal. A soil sample was collected from beneath the UST by FGL Environmental. The sample was analyzed for total petroleum hydrocarbons (TPH as gasoline), volatile aromatics (BTE&X), lead and ethylene dibromide (EDB). TPH as gasoline was detected in the soil sample from the UST removal at 14 parts per million (ppm); benzene was detected at 8.6 ppm; EDB was detected at 0.27 ppm; and lead was detected at 8 ppm. y 0-6,i.1 Audi,UM..,I... 1 N—W.i 939 PIER/1037/D.1994