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I Preliminary Site Assessment Work Plan RMB GARAGE (ERARDI) 715 North Hunter Street, Stockton, California 1 .0. INTRODUCTION At the request of Mr. Vince Erardi, Advanced GeoEnvironmental, Inc. (AGE) has prepared Preliminary Site Assessment Work Plan for the property at 715 North Hunter Street, Stockton, California (the site). The location of the site is illustrated on Figure 1 . A plan view of the site is illustrated on Figure 2. This work plan has been prepared as required by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) by letter dated 03 August 2001 to investigate the vertical and lateral extent of the subsurface impact from an unauthorized release(s) associated with j operation of the underground storage tank (UST) system on the site. This work plan has been prepared in accordance with Appendix A to Tri-Regional Recommendations - Reporting, dated 30 August 1991 , issued by the Central Valley Regional Water Quality Control Board (CVRWQCB). This work plan provides a description of the scope of work and procedures to be used in soil probe borings, soil and groundwater sample collection and analysis and soil boring abandonment. The focus of the work plan is to assess the vertical extent of impacted soil and to assess the ground water for the released contaminants. The results of this investigation may be utilized as a guide for further assessment for lateral extent of impacted subsurface media. 2.0. BACKGROUND The site is located on the northwest corner of Park Street and North Hunter Street in a commercial/residential area of Stockton, California (Figure 1 ) . Based on historical research of the area, the site began dispensing fuel in the 1930's or 1940's and ceased prior to 1986. The site operated as a car dealership until approximately 1987, since 1987 the site has operated as an auto service repair shop. 2. 1 . UNDERGROUND STORAGE TANK REMOVAL On 12 April 2001 , one 500-gallon waste-oil UST (Tl) and two 500-gallon fuel USTs (T2 and T3) were removed from beneath the sidewalk adjacent to 715 North Hunter Street, Stockton, California. The USTs were removedunderPHS-EHD permitby Stockton Service Station Equipment Company, Inc. The approximate location of the former USTs is shown on Figure 2. During the UST removals, one soil sample was collected beneath each of the USTs (Tl -W, T2-E and T3 -E) and one soil sample each was collected 2 . 5-feet beneath the former locations of two fuel dispensers and one waste-oil fill port (1) 1 -2 . 5', D2-2 .5' and WO- 1). Additionally, two samples were Advanced GcoEnvironmental, Inc.