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Site Investigation Work Plan - August 1998 GREWAL'S MARKET 4100 East Fremont Street, Stockton, California 1.0. INTRODUCTION In accordance with the request of Mr. Rick Grewal of Grewal's Market, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Site Investigation Work Plan for the lateral and vertical assessment of hydrocarbon-impacted soil at 4100 East Fremont Street, Stockton, California. The scope of work initially includes the advancement of at least four soil probe borings near the underground storage tank (UST) area and collection of soil samples. However, additional soil probe borings may be required to fully define the lateral and vertical extent of hydrocarbon-impacted soil. 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 DESCRIPTION AND USAGE The site is located on the southeast comer of the intersection of Oro and Fremont Streets, in an area of low topographic relief in Stockton, California. The site is currently operated as a fueling facility and a mini-market. Previously,one I0,000-gallon gasoline UST, one 6,000-gallon gasoline UST and one 6,000-gallon diesel UST were located on the west section of the property; a waste oil UST was previously removed from the site in 1996. 2.2. PREVIOUS INVESTIGATION On 12 May 1997, five soil probe borings (P-1 through P-5) were advanced to maximum depths of approximately 32 feet below surface grade (bsg). Soil probe borings P-1 and P-2 were advanced to depths of 15 feet bsg near the dispenser island area; soil probe borings P-3 through P-5 were advanced beneath the UST area to maximum depths of 32 feet bsg at an angle of approximately 25 degrees. Soil samples were collected from each probe boring and submitted to a state certified laboratory for analysis of total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g, TPH-d); volatile aromatics (benzene, toluene, ethyl benzene and xylenes; BTE&X); and methyl tertiary butyl ether (MtBE). Advanced GeoEnvironmental,Inc.