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Work Plan Addendum - March 1997 <br /> CALIFORNIA FUELS CARDLOCK STATION <br /> 2402 Pacific Avenee <br /> Stockton, California <br /> I.O. INTRODUCTION <br /> In accordance with the request of Mr David Atwater of Van De Pol Enterprises, Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this Work Plan Addendum for additional investigation <br /> of the former underground storage tank (UST) area at 2402 Pacific Avenue in Stockton, California <br /> (the site) The location of the site is illustrated in Figure 1 - Location Map A plan of the site is <br /> illustrated on Figure 2 - Site Plan <br /> This work plan addendum was prepared in accordance with San Joaquin County Public Health <br /> Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality <br /> Control Board (CVRWQCB) guidelines for the investigation of UST sites <br /> 2.0. BACKGROUND <br /> 21 SITE DESCRIPTION AND USAGE <br /> The site is located at 2402 Pacific Avenue, on the northeast corner of the intersection of Castle Street <br /> and Pacific Avenue, in a topographically flat area of the city of Stockton, San Joaquin County, <br /> California The site is within the northeast quarter of Section 6, Township 2 North, Range 6 East, <br /> Mount Diablo Base and Meridian (MDB&M) <br /> The property was utilized as a fueling facility for at Ieast 20 years The site operated as a retail <br /> gasoline dispensing station between May 1983 and January 1995 A wide spectrum of fuels, including <br /> gasoline and diesel fuel, were stored and dispensed of on the site at various times Two 10,000-gallon <br /> gasoline USTs and one 10,000-gallon diesel UST were in operation with no known history of repair <br /> 22 PREVIOUS INVESTIGATIONS <br /> The following is a summary of previous investigation at the site <br /> • In March 1996, three 10,000-gallon USTs were removed from the site Following UST <br /> removal activities, soil samples were collected beneath each UST Substantial petroleum <br /> hydrocarbon contamination was detected beneath two of three USTs <br /> • In July 1996, four ground water monitoring wells (MW-1 through MW-4) and two <br /> exploratory soil borings (B-1 and B-2) were advanced at the site Impacted soil and ground <br /> water were encountered in all borings and wells advanced <br />