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Ozone Injection Pilot Study Work Plan West Clay Properties 639 West Clay Street, Stockton, California 1.0. INTRODUCTION At the request of Ms. Tina Mayhew, of West Clay Properties,Advanced GeoEnvironmental, Inc. (AGE)has prepared this Ozone Injection Pilot Study Work Plan for the property located at 639 West Clay Street(site),Stockton,California.The location of the site is illustrated on Figure 1.A site plan is illustrated on Figure 2. A summary of background information is presented in Appendix A. Interim remediation of hydrocarbon-impacted soil near the former underground storage tank(UST) areas has been conducted at the site under the direction of the San Joaquin County Environmental Health Department (EHD). These remediation events appear to have been generally successful, however,the significant concentrations of dissolved hydrocarbons are still present at the location of former extraction well EW-1,removed prior to soil excavation at the cluster UST area.The vertical extent of the contamination plume is defined in the area of the northern UST location yet the vertical and lateral extent of the dissolved contamination plume at the southern UST location is not well defined. There are two separated release locations,thus remediation feasibility should begin at the defined northern dissolved hydrocarbon and fuel additive (MTBE)plume at the cluster UST area. During active remediation,the vertical limits of the dissolved contamination plume at the southern UST location will be require additional assessment. This work plan details the scope of work for ozone injection well installation,system installation and system monitoring for up to six months. 1.1 OZONE INJECTION BENCH SCALE TEST AGE prepared Ozone Injection-Bench Scale Pilot Study dated 08 February 2005 as directed by the EHD's directive letter dated 07 February 2005. The letter directed the performance of a laboratory bench scale study to chemical reaction of ozone injection into the aquifer. The Ozone Injection - Bench Scale Pilot Study was approved by the CVRWQCB through by electronic letter. The CVRWQCB approved the scope of the Bench Scale Pilot Study and further required a chrome 6+ degradation study in addition to the Ozone bench scale analysis; the CVRWQCB also directed the use of a nitrogen sparge blank pilot study to evaluated volatilization over the force of oxidation. On 01 April 2005, AGE collected soil from boring B17, established in the former UST cluster excavation to a depth of 35 feet below surface grade (bsg). Additionally, on 05 April 2005, AGE collected ground water from monitoring well MW-10 for chemical analysis. Advanced GeoEnvironmental,Inc.