ARCHIVED REPORTS_NOTICE OF INTENT FOR INSTALLATION, OPERATION AND MAINTENANCE OF AN OZONE INJECTION GROUNDWATER REMEDIATION SYSTEM

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Pre-field Activities ' • We will update the existing site health and safety plan (HSP) as necessary to address this phase of the project. The HSP will provide guidelines on the use of personal protective equipment and the ' health and safety procedures to be implemented during the proposed field activities. We will mark each of the proposed boring locations with white paint and provide a minimum of 48-hour notice to the local public utilities via Underground Service Alert prior to commencement ' of the subsurface excavations as required by law.The services of a private utility locating company will also be obtained to further attempt to delineate subsurface utilities and conduits in proximity to the proposed excavation locations. ' • We will obtain well construction permits from the San Joaquin County Environmental Health Department (SJCEHD) and pay requisite fees prior to initiating drilling and ozone-sparge well construction. ' • We will contact the San Joaquin County Community Development Department regarding the requirements for a commercial building permit (active electricity currently available at the Site) ' prior to the installation of the ozone system. Retain the services of a California C57-licensed subcontractor to perform the HSA drilling and ozone-sparge well installation activities. Field Activities ' Seventeen ozone-sparge wells will be constructed by HSA drilling techniques at the approximate locations shown on Figure 4. Each well will be constructed with a 1.5-foot-long sparge point set approximately 0.5 foot above the bottom of the boring as shown in Figure 5. The ozone-sparge wells ' will be installed in a staggered pattern vertically to optimize the area of ozone influence. Nine borings will be advanced to an approximate depth of 40 feet(10 feet below the groundwater surface), and eight borings will be advanced to an approximate depth of 50 feet(20 feet below the groundwater surface). While boring, soil samples will be collected at 5-foot intervals using a 2-inch-diameter by 18-inch-long split spoon sampler. Since the proposed borings will be co-located near previously advanced borings from which soil analyses have been previously performed, no soil samples from the new borings will be submitted for laboratory analysis. Thus, no sample tubes will be placed in the sampler to allow optimum soil exposure for lithologic logging purposes. The sampler will be driven commencing at each sample depth, 18 inches into the underlying soil by a 140-pound hammer dropping 30 inches. The number of blows required to advance the sampler each 6-inch increment will be noted and recorded on the field boring log. Each sample will be logged in the field using the Unified Soil Classification System and field-screened during drilling with a photoionization detector to obtain a preliminary indication of potential hydrocarbon impacts in the subsurface soils. The' headspace readings will be presented on the boring logs and included in a groundwater remediation system installation report. Prior to and following each use of the sampling equipment, the equipment will be decontaminated by washing the equipment in an. AlconoxTM solution, followed by a fresh water rinse, and subsequent ' distilled or purified water rinse. Auger flights and drilling rods used during the advancement of the borings will be steam cleaned prior to use on each subsequent boring. ' Project No.59183-06-02 -5 - November 11,2009