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Preliminary Site Assessment BJJ-BLINCO TRUCKING 2431 East Mariposa Road, Stockton, California 1.0. INTRODUCTION At the request of Mr. Greg Smith of BJJ Trucking Company, LLC, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Preliminary Site Assessment Work Plan for the property located at 2431 East Mariposa Road, Stockton, San Joaquin County, California (site). On-site structures locations are illustrated in Figure 2. The site property is located along the south-southwest side of East Mariposa Road and west-southwest side of the Highway 99 Frontage Road, in unincorporated San Joaquin County, south of the City of Stockton, California. Highway 99 is located approximately 500 feet east of the property. The property comprises seven parcels, totaling approximately 16.07 acres. The scope of work includes advancement of up to five (5) soil probe borings for the collection of soil samples to evaluate the presence and define the type or extent of petroleum hydrocarbon-impacted soil between 15 and 40 feet below surface grade (bsg). Two 12,000-gallon diesel underground storage tanks (USTs) located northwest of the `Old Office' building were removed and impacted soil was observed under the western edge of the UST complex. Two dispensers were located above the USTs and were also removed during the UST removal. Total petroleum hydrocarbons as diesel (TPH-d) were detected in the western and central soil samples collected at the base of the excavation at 15 feet bsg beneath each UST; TPH-d was detected in the two western samples (Tank #1- West/East) at concentrations over 10,000 milligrams per kilogram (mg/kg) and in the central soil samples at concentrations of 280 mg/kg (Tank#1-Center) and 410 mg/kg (Tank#2-Center). TPH-d were detected in the composited soil sample (SP-1,2) at 1,600 mg/kg; and the remaining soil had detections over 100 mg/kg and one sample had a detection of 6,800 mg/kg. Toluene, ethyl- benzene and total xylenes were detected in the UST and stockpile samples at minor concentrations less than 0.1 mg/kg. The work plan provides a description of the scope of work and procedures to be used for soil boring advancement, sample collection and analysis; and boring abandonment. The work plan was prepared as directed by San Joaquin County Environmental Health Department (SJCEHD) requirements for investigation of underground storage tank (UST) sites. Advanced GeoEnvironmental Inc.