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SUPPLEMENTAL SITE INVESTIGATION <br /> 4555 NORTH PERSHING AVENUE <br /> • STOCKTON, CALIFORNIA <br /> 1 INTRODUCTION <br /> This Supplemental Site Investigation Report describes the soil vapor, soil, and groundwater <br /> sampling performed in the general vicinity of the former Cardlock Gas Station Site at <br /> 4555 North Pershing Avenue, Stockton, California, between 27 February 1995 and <br /> 1 March 1995. A general site location map is provided on Figure 1. The purpose of the <br /> investigation was to assess the possible offsite migration of petroleum hydrocarbons <br /> Kennedy/Jenks Consultants' work included obtaining samples from a total of eight discrete <br /> locations, including six sampling locations east of the site and two onsite locations Soil <br /> vapor samples were initially collected from the first three locations (SV1 , 2 and 3), how- <br /> ever, the soil vapor analysis did not effectively characterize the petroleum hydrocarbon <br /> distribution Therefore, soil samples were collected from each borehole and analyzed for <br /> • Total Petroleum Hydrocarbons (TPH) as gasoline, and Benzene, Toluene, Ethylbenzene, and <br /> Xylenes (BTEX) A grab groundwater sample was also collected from each sampling loca- <br /> tion and analyzed for TPH and BTEX The eight sampling locations are shown on Figure 2 <br /> (SV1 through SV8) <br /> 2. BACKGROUND <br /> The former Cardlock Service Station located at 4555 N Pershing Avenue in Stockton sold <br /> gasoline and diesel fuel from 1979 until May 1990 The site is approximately 140 feet <br /> long and 65 feet wide, and is bordered on the south by Rose Marie Lane, on the east by a <br /> pet hospital, on the north by the Venetian Square Shopping Center, and on the west by <br /> retail businesses The station opened in 1979 with three 12,000-gallon underground fuel <br /> tanks, one for diesel, one for leaded gasoline, and one for unleaded gasoline In May <br /> 1987, the diesel tank and one of the gasoline tanks failed a tank integrity test In Novem- <br /> ber 1989, the diesel tank again failed a precision tank test The file located in the offices <br /> 4;�obsW40549Vepondoc 1 940549 00 <br />