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Remedial Action Work Plan - December 2003 <br /> PACIFIC MINI MART <br /> 4511 Pacific Avenue, Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr. Art Wyatt, Advanced GeoEnvironmental, Inc. (AGE) has <br /> prepared the enclosed Remedial Action Work Plan for 4511 Pacific Avenue in Stockton,California <br /> (site). This work plan details procedures for the installation of three additional soil vapor extraction <br /> (SVE) wells, installation of a SVE piping network, operation/monitoring of an SVE system, and <br /> installation of one ground water extraction well to be installed on the eastern edge of the site. The <br /> location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. <br /> This work plan was prepared in accordance with Central Valley Regional Water Quality Control <br /> Board guidelines for investigation of underground storage tank(UST)sites and San Joaquin County <br /> Environmental Health Department directives. <br /> 2.0. BACKGROUND <br /> Corrective Action Plan(CAP)recommending soil vapor extraction was prepared for the site in 1994 <br /> by Upgradient Environmental. The CAP has not received an approval by the EHD. <br /> 2.1. SITE DESCRIPTION <br /> The site is located at the northwest corner of Pacific Avenue and Rose Marie Lane in Stockton, <br /> California and is currently operated as a gasoline dispensing station and mini-mart. The facility <br /> consists of a building and three dispenser pump islands with a covered canopy. <br /> 2.2. UNDERGROUND STORAGE TANK USE AND HISTORY <br /> In February 1991, a broken coupling in a product line was discovered and repaired. Free-phase <br /> petroleum was observed the surface of the northern dispenser island. During repair procedures, <br /> hydrocarbon-impacted soil was discovered beneath the product line. Total petroleum hydrocarbon <br /> as gasoline (TPH-g) was detected at concentrations of 100 milligrams per kilogram (mg/kg) and <br /> 13,000 mg/kg and benzene was detected at concentrations of 1 mg/kg and 140 mg/kg in samples at <br /> depths of 8 and 23 ft below surface grade (bsg). Subsequently, the EHD required an assessment of <br /> the vertical and lateral extent of the hydrocarbon impact. <br /> Six USTs were removed from the site on 8 April 1994. In May 1994, two 12,000-gallon USTs and <br /> associated piping were installed at the site to replace the removed tanks.Details ofthe UST removals <br /> and soil sampling were presented in reports to the EHD. Hydrocarbons in soil were detected in the <br /> Advanced GeoEnviron mental,Inc. <br />