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a PRELIMINARY INVESTIGATION AND EVALUATION REPORT August 1996 ' California Fuels Cardlock Station 2402 Pacific Avenue, Stockton, California 1.0 INTRODUCTION ' In accordance with the request of Mr David Atwater of Van De Poi Enterprises, Advanced GeoEnvironmemal, Inc (AGE) has prepared this Preliminary Investigation and Evaluation Report ' (PIER)for 2402 Pacific Avenue, Stockton, California The scope of work included the advancement of six soil borings, the installation of four ground water monitoring wells, and the collection and analysis of soil and ground water samples The location of the site is illustrated on Figure 1 - Location ' Map A plan of the site is 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 Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites ' 2.0. BACKGROUND 2 1 SITE DESCRIPTION AND USAGE The site is located at 2402 Pacific Avenue, on the northeast corner of the intersection of Castle Street and Pacific Avenue, in a topographically flat area of the city of Stockton, San Joaquin County, California The site is within the northeast quarter of Section 6, Township 2 North, Range 6 East, ' Mount Diablo Base and Meridian (MDB&M) The usage of the property as a fueling facility dated back to at least 20 years California Fuels ' Cardlock Station (CFCS) operated the site as a retail station of motor vehicle fuels between May - 1983 and January 1995 A wide spectrum of fuels, including gasoline and diesel fuel, was stored and dispensed of on the site at various times Two 10,000-gallon gasoline underground storage tanks ' (USTs), and one 10,000-gallon diesel UST were in operation with no known history of repair during the occupation of CFCS 2 2 UNDERGROUND STORAGE TANK REMOVAL The three 10,000-gallon USTs were excavated and removed from the site in March 1996 Soil samples were collected at a depth of approximately 17 to 18 feet below site grade (bsg) beneath each UST at the time of their removal Substantial petroleum hydrocarbon contamination was detected beneath two 10,000-gallon gasoline USTs Following tank removal, the three 10,000-gallon USTs . were disposed of to a proper UST disposal facility, while soil from the tank excavation was placed back into the original excavation The results of the soil samples collected during the tank removal