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Ozone Injection Pilot Study Work Pla,,RECEgym GEWEKE PROPERTY 16 South Cherokee Lane, Lodi, California AUG 3 n '00$ ENVIRONMENT HEALTH 1.0. INTRODUCTION PERMIT/SERVICES At the request of Mr. Dale Gillespie of G-REM, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Ozone Injection Pilot Study Work Plan for the property located at 16 South Cherokee Lane, Lodi, California (site) and the surrounding area. The location of the site is illustrated on Figure 1. A site plan is illustrated on Figure 2. In a letter dated 30 October 2003, the Central Valley Regional Water Quality Control Board (CVRWQCB) concurred with AGE's recommendations for implementation of an ozone injection well pilot study for the area of the highest concentrations of dissolved hydrocarbons - near the former dispenser island and monitoring well MW-14. This work plan details the scope of work for ozone injection well installation, system installation and system monitoring for up to six months. This work plan is prepared in accordance with Cleanup and Abatement (C&A) Order No. 93-701 and is in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of underground storage tanks (UST) sites. 2.0. BACKGROUND In 1985,two 10,000-gallon,one 6,000-gallon and one 1,000-gallon underground storage tank(UST) were removed from the site.No samples were collected from the tank excavation.In October 1985, San Joaquin County required G-REM to conduct a site investigation of suspected leakage from the 1,000-gallon waste oil tank. Between 1986 and 2002, thirty-two soil borings, seven vapor extraction wells, one ground water extraction well and nineteen ground water monitoring wells were installed on and near the site. Ground water monitoring was conducted at the site by Kleinfelder in 1985, Brown and Caldwell from February 1986 to July 1990,PES Environmental Inc.and Blaine Tech Services,Inc.from May 1991 to September 1991,Sun Tech Environmental Inc.from December 1991 to July 1993,Geologic Audit Services, Inc. (GeoAudit) from September 1993 to September 1994 and AGE from March 1995 to the present. A Problem Assessment Report (PAR) was prepared by PES Environmental Inc. and submitted to the CVRWQCB in July 1991. A Final Remediation Plan (FRP) was prepared by GeoAudit and submitted to the CVRWQCB in July 1993. In December 1993,a low pressure blower was installed and connected to the seven vapor wells and four monitoring wells to introduce an oxygen source (air) in preparation to innoculate wells with hydrocarbon-consuming bacteria. In August 1994, in-situ bioremediation began at the site by Advanced GeoEavlronmental,Inc.