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1.0 INTRODUCTION This report presents the results of the agency research regarding the adjacent car-wash, and nearby Shell, 7-11 and former Ekon service stations, and of the soil and groundwater sampling and analysis conducted at the former cardlock gasoline station located at 4555 North Pershing Avenue in Stockton, California. This work was conducted in accordance ' with the proposal entitled "Workplan for Monitor Well Installation, Soil and Groundwater Sampling and Analysis at 4555 Pershing Avenue in Stockton, California", dated October 8, 1992. All work performed was in accordance with preliminary site assessment guidelines presented in the State Water Resources Control Board (now Cal-EPA) "Leaking Underground Fuel Tank (LUFT) Field Manual', and the Regional Water Quality Control Board "Staff Recommendation for Initial Evaluation and Investigation of Underground Tanks". 1.1 Site Description The subject property is located near the northwest comer of the intersection of Pershing Avenue and Rose Mane Lane in Stockton, California. The subject property is bordered to the east by a veterinary hospital, to the south by a car wash, to the north by the Venetian Square Shopping Center, and to the west by retail businesses. A 7-11 convenience store ' which dispenses gasoline is located approximately 100 feet to the east of the subject property, at the northwest comer of the intersection of Rose Mane Lane and North Pershing Avenue; a shell service station is located approximately 150 feet southeast of the subject property, at the southwest comer of the intersection of Rose Mane Lane and North Pershing Avenue, and an Exxon service station was previously located approximately 200 feet to the southeast of the subject property, at the southeast corner of the intersection of ' Rose Mane Lane and North Pershing Avenue A Site Location Map is included as Figure 1. 1.2 Previous Investigations Previous investigations have been performed at the site by TreaTek, Inc. and by TMC ' Environmental, Inc Information regarding the prior investigation conducted at the site was provided to McLaren/Hart by Neumiller & Beardslee, and by the San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) Nine soil bonngs were drilled in June 1991 by TMC Environmental Inc. to maximum depths of 31 feet below ground surface at the subject property. Maximum concentrations of Total Petroleum Hydrocarbons (TPH), up to 300 milligrams per kilogram (mg/kg), were detected in the samples collected approximately 25 feet below ground surface from the borings drilled in the northeast corner of the property Three 12,000 gallon underground fuel storage tanks, one leaded gasoline, one unleaded gasoline and one diesel, were excavated and removed from the property on January 8, 1992. Soil samples were collected and analyzed for concentrations of TPH, benzene, toluene, ethylbenzene and xylenes (BTEX), ethylene dibronnde (EDB) and total lead. iiiaieai 1