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Soil Vapor Extraction/In-Situ Air Sparging Work Plan Addendum FORMER RIVER CITY PETROLEUM (CONNELL MOTOR LIFT TRUCK 2211 North Wilson Way, Stockton, California 1.0. INTRODUCTION At the request of Ms. Kerry Heckman of Connell Motor Lift Truck,Advanced GeoEnvironmental, Inc. (AGE)has prepared this Soil Vapor Extraction/In-Situ Air Sparging Work Plan Addendum for the FORMER RIVER CITY PETROLEUM location at 2211 North Wilson Way, Stockton, California(site). The site location and site plan are illustrated on Figures 1 and 2. The work plan has been prepared at the request of the California Regional Water Quality Control Board - Central Valley Region (CVRWQCB) Corrective Action Plan approval letter dated 29 January 2008. Site background information is included for the stoddard release area, along with a table of all monitoring well designations is including in Appendix A. The Corrective Action Plan(CAP)detailed the pilot study,including the feasibility,general costs, and recommended implementation of two additional remedial action alternatives for petroleum- hydrocarbon impact to ground water at the site.An active in-situ air sparging(IAS)and soil vapor extraction(SVE)remediation pilot study at the site has been in operation for nine months and the results of the study are summarized within the CAP and within this work plan. 1.1. SOIL REMEDIATION ALTERNATIVES Based on the petroleum hydrocarbons distribution in soil, current ground water concentrations of petroleum hydrocarbons on the site, and the success of the active soil vapor extraction (SVE) operation,AGE recommends the continued application of SVE to address(remediate)impacted soil and shallow ground water(HU1). A catalytic oxidizer SVE unit is connected to a total oftwenty-six extraction wells on the eastern and western portions of the site. A total of nineteen individual SVE wells (VW-6A through VW-15B) and monitoring well MW-1 are located on the eastern side of the site and are connected above ground to the SVE unit.The piping(influent line)to a 20-horsepower,maximum 500 standard cubic feet per minute(scfm)blower;the average recorded operation is near 300 to 400 scfm. The mass of hydrocarbons removed by the SVE system demonstrated successful remediation;a total of 816 lbs (130 gallons) was removed between June and September 2007; a cumulative total of 23,047.5 lbs, or volume of 3,628.5 gallons, were removed since the initiation of SVE system. The influent concentration for soil vapor samples collected over the past year has declined;however,the ground water table decline observed in the second half of the year has caused an increased extraction mass over the remediation period.Continual operation of the SVE unit will be required during active In-situ air-sparging.A carbon-based canister system, activated carbon filters,could be installed for adsorption of hydrocarbons; for removing the lower hydrocarbons concentrations from the vapor Advanced GeoEnvironmental,Inc.