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04 January 2005 <br /> AGE-NC Project No. 96-0235 <br /> Page 2 of 5 <br /> • Preparation of a report on the results of well installation activities and the in-situ ozone <br /> sparge feasibility study. <br /> Based upon results from several air-sparging and ozone-injection projects in the San Joaquin County <br /> area, it has been AGE's experience that iron (metal) fouling of sparge points has been not <br /> detrimental to the site remediation;while two of the projects are in the city of Stockton and near the <br /> site with similar hydrogeologic setting (including Fire Station No. 2) have demonstrated overall <br /> successful results. <br /> A "bench scale test" or laboratory scale analysis will be performed prior to implementation of the <br /> active pilot study to determine if any site-specific conditions (e.g, metal-fouling of injectors) exist <br /> that may"render the pilot study ineffective"or produce additional water quality degradation. Sparge <br /> point fouling can be corrected by introduction of dilute cleaning fluids,including low concentrations <br /> of HCL,into the sparge wells.During the installation of the proposed ozone sparge points,AGE will <br /> collect soil and, if necessary, ground water samples from the pilot borings. These samples will be <br /> submitted to a California Department of Health Services (DHS)-certified laboratory to analyze for <br /> their general mineral content. <br /> 2.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment permits will be submitted to the San Joaquin County Environmental <br /> Health Department (EHD) and a health and safety plan will be prepared in accordance with <br /> Occupational Safety and Health Guidance Manual for Hazardous Waste Site Activities (National <br /> Institute for Occupational Safety and Health Administration, U.S. Coast Guard and U.S. <br /> Environmental Protection Agency, 1985).Prior to drilling activities,each proposed drilling location <br /> will be clearly marked and a utility clearance obtained through Underground Service Alert. <br /> 2.2. OZONE INJECTION WELL INSTALLATION <br /> Based on concentrations of TPH, benzene and MTBE in the area of northern UST area, AGE <br /> proposes installation of a total of 10 ozone injection wells in the following areas: <br /> • Approximately 10 and 20 feet south of wells MW-10, EW-1 and boring B9; <br /> • Approximately 10 to 20 feet north of east of wells MW-10, EW-1 and boring 139; <br /> • Approximately 10 to 15 feet west of wells MW-10, EW-1 and boring B9 and <br /> • Approximately located at well MW-9 and 10 to 15 feet north of well MW-9. <br /> Advanced GeoEnvi ron mental,Inc. <br />