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Site Investigation Work Plan Pacific Pride- West Lane 3230 North West Lane, Stockton, California 1.0. INTRODUCTION In accordance with the request of Mr. David Atwater of Van De Pol Enterprises, Advanced GeoEnvironmental,Inc. (AGE)has prepared this Site Investigation Work Plan for the collection of soil samples at 3230 North West Lane in Stockton, California(the site). The scope of work includes the advancement of six soil probe borings in the underground storage tank (UST) and in the dispenser and piping areas for the collection and analysis of soil samples. The location of the site is illustrated in Figure 1. A plan of the site is illustrated on Figure 2. 2.0. BACKGROUND Soil impacted by fuel hydrocarbons and oxygenated fuel additives was encountered during the removal of USTs from the site in February 1999.The PHS-EHD has required by letter dated 03 June 1999 that a work plan to determine the lateral and vertical extent of contamination be prepared. This Work Plan is prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board(CVRWQCB) guidelines for the investigation of UST sites. 2.1. SITE DESCRIPTION AND USAGE The site is located in a flat, commercial area of eastern Stockton, California, on the southeast corner of the intersection of West Lane and Alpine Avenue. One 10,000-gallon diesel UST and two 10,000- gallon gasoline USTs were removed from the site on 24 February 1999. 2.2. UNDERGROUND STORAGE TANK REMOVAL AND SOIL SAMPLES Soil samples collected from the stockpiled soil (Tables 1 and 2) detected total petroleum hydrocarbons quantified as diesel (TPH-d)at concentrations as high as 75 micrograms per kilogram (ug/kg); volatile aromatic compounds: benzene, toluene, ethylbenzene and xylenes (BTEX) were detected at concentrations as high as 16,000 pg/kg;methyl tertiary butyl ether(MTBE)was detected at concentrations as high as 180,ug/kg. Soil samples from the base and walls of the tank pit were collected at 14 and 15 feet below surface grade(bsg). The northern west wall sample for Tank#2 had petroleum-impacted soil consisting of Advanced GeoEnvironmental,Inc.