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Ground Water Investigation Report - February 2002 City of Stockton Municipal Service Center 1465 South Lincoln Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. James B. Gottomni of the City of Stockton, Advanced GeoEnvironmental, Inc. (AGE) has prepared this ground water investigation report for 1465 South Lincoln Street, Stockton, California. The purpose of the investigation was to assess ground water for tetrachloroethene (PCE) encountered in shallow soil samples collected during abandonment of a — waste oil product line at the site in March 2001. The scope of work included the advancement of one soil boring and the collection and analysis of soil and ground water samples. The location of the site and its surroundings are illustrated on Figure 1. Major features on the site and the soil boring location are illustrated on Figure 2. This investigation was perfonned in accordance with guidelines issued by the Central Valley _ Regional Water Quality Control Board (CVRWQCB) for the investigation of underground storage tank (UST) sites. 2.0. BACKGROUND The site is located at 1465 South Lincoln Street in Stockton, California (Figure 1). The parcel is located in the northwest portion of Section 14 of Range 6 East, Township 1 North, Mount Diablo Base and Meridian. 2.1. SITE DESCRIPTION The property is located in an industrial and commercial area of southern Stockton. The property is presently occupied by the City of Stockton Municipal Service Center,which includes three one-story structures housing an office, maintenance garage, lunchroom, miscellaneous shops, and a gasoline fueling facility consisting of USTs, two dispenser islands with four gas dispensers. 2.2. PRODUCT LINE ABANDONMENT Three former waste oil product lines were abandoned in place on 21 March 2001 (Figure 1) at the referenced address. Following excavation, soil samples were collected two feet below the exposed end of Line A (LA-N) and directly below the inlets of Line A (LA-S), Line B (LB-S) and Line C (LA-C). The samples were analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-g), diesel (TPH-d) and motor oil (TPH-mo), volatile organic compounds including benzene, Advanced GcoEnkironnien(JI.Inc.