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Preliminary Site Investigation Work Plan January 1998 YELLOW CAB COMPANY 2210 Country Club Boulevard, Stockton, California 1.0. INTRODUCTION In accordance with the request of Mr. Tom Daniels of the Yellow Cab Company, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Preliminary Site Investigation Work Plan for the collection of soil and ground water samples at 2210 Country Club Boulevard, Stockton, California. The scope of work initially includes the advancement of one soil probe borings near the former underground storage tank (UST) area and collection of soil and "grab" ground water samples. However,additional soil probe borings may be required to fully define the lateral and vertical extent of hydrocarbon-impacted soil and/or ground water. The location of the site is illustrated in Figure 1; a plan of the site is illustrated on Figure 2. This Work Plan is prepared in accordance with the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (RWQCB) guidelines for the investigation of UST sites. 2.0. BACKGROUND 2.1. SITE LOCATION AND DESCRIPTION The site is located at 2210 Country Club Boulevard, on the south side of Country Club Boulevard, between California State Highway 5 and Pershing Avenue, in a topographically flat area of the city of Stockton, San Joaquin County, California. The site is further located within the southwest quarter of Section A, Township 1 North, Range 6 East, Mount Diablo Base and Meridian (Stockton West Quadrangle, 7.5-Minute USGS Topographic Series, photo revised 1987). It is our understanding that the site area was formerly utilized as a storage and maintenance yard for a Taxi-cab company (Yellow Cab Company). 2.2. UNDERGROUND STORAGE TANK REMOVAL It is our understanding that one 2,000-gallon UST was removed from the site on 01 July 1992. Laboratory analysis of soil samples collected from beneath both ends of the tank detected concentrations of total petroleum hydrocarbons and volatile aromatics. Furthermore,field notes from a representative of the PHS-EHD indicated petroleum odors and discoloration at both ends of the tank at approximately 13 feet below site grade (bsg). Advanced GeoEnvironmental,Inc.