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Work Plan Addendum - August 1997 <br /> CALIFORNIA FUELS CARDLOCK STATION <br /> 2402 Pacific Avenue <br /> Stockton, California <br /> 1.0 INTRODUCTION AND SCOPE OF WORK <br /> In accordance with a request from Mr David Atwater of Van De Pot Enterprises, Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this Work Plan Addendum for 2402 Pacific Avenue, <br /> Stockton, California (the site) The scope of work will include the installation of one in-situ air <br /> sparging well (IAS) and performance of a 72-hour IAS pilot study The location of the site is <br /> illustrated in Figure 1 -Location Map The layout of the site is depicted in Figure 2 - Site Plan <br /> Field activities will be performed in accordance with the guidelines established by the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) and the San Joaquin County Public Health <br /> Department-Environmental Health Division (PHS-EBD) for investigation of underground storage <br /> tank (UST) sites <br /> 2.0. BACKGROUND <br /> 2 1 SITE LOCATION AND DESCRIPTION <br /> The site is located at 2402 Pacific Avenue, on the northeast corner of the intersection of Castle Street <br /> and Pacific Avenue, in Stockton, California The site is further described as being located within the <br /> northeast quarter of Section 6, Township 2 North, Range 6 East, Mount Diablo Base and Meridian <br /> (Stockton West Quadrangle, 7 5-Minute USGS Topographic Series, photorevised 1987) <br /> The property is presently undeveloped, however, was historically operated as a gasoline fueling <br /> facility The surrounding properties are primarily commercial and residential <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 monitornng wells (MW-1 through MW-4) and two <br /> exploratory soil borings (B-I and. B-2) were advanced at the site Impacted soil and ground <br /> 40 water were encountered in all borings and wells advanced <br /> • In December 1996, six soil probe borings (13-3 through B-8) were advanced off-site <br /> Advanced GeoEm ironnientsd,Inc <br />