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Preliminary Investigation and Evaluation Report Conti Trucking, Inc. 2660 Loomis Road, Stockton, California 1.0. INTRODUCTION In accordance with the request of Mr. Gene Conti Jr. of Conti Trucking Advanced GeoEnvironn7ental, Inc. (AGE) has prepared this Preliminary Investigation and Evaluation Report (PIER) for 2660 Loomis Road (the site), Stockton, California. The scope of work included advancement of three soil probe borings and collection and analysis of soil samples. The location _ of the site and its surroundings are illustrated on Figure 1; major features on the site and soil probe boring locations are illustrated on Figure 2. _ This investigation was performed in accordance with guidelines of the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and of the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (LIST) sites. 2.0. 13ACKGROUND In September 1999, two USTs were removed from the site by Elite Four General Contractors. Based on field observations and analytical results of soil samples collected during the tank removals. the PHS-EHD directed that a subsurface investigation be performed at the site to delineate the vertical and horizontal extent of petroleum hydrocarbon impacted soil. In accordance with PHS-EHD directives, procedures for a subsurface investigation were presented in the AGE-prepared Site Investi,alion Work Plan, dated 27 December 1999 and approved by the PHS-EHD by letter dated 05 January 2000. 2.1. SITE LOCATION AND DESCRIPTION The site is located in an unincorporated commercial area of southern Stockton at the end of Loomis Road. (Figure 1). The site is presently occupied by Conti Trucking, Inc. The major portion of the site consists of unpaved dirt area used as a parking lot for trucks (Figure 2). A single story office facility and truck garage is presently located on the site. A domestic drinking water well is located approximately 150 feet northeast of the former UST area. 2.2. UNDERGROUND STORAGE TANK REMOVAL On 22 September 1999, two 10,000-gallon diesel USTs, were removed from the site by Elite Four General Contractors. The approximate locations of the former USTs are shown on Figure 2. The two — USTs were located at the west end of the site. The excavation was not backfilled to surface grade and it is still open at the time of preparation of this report. Advanced GcoEmironiental,Inc.