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Ozone Remediation Pilot Test Work Plan San Joaquin County Public Works, Stockton, CA June 152015 Page 3 flux of TPH-G is 87.04 grams 'day, or 0.2 pounds/day. The estimated mass flux of MTBE is 14.11 grams/day, or 0.03 poundsiday. The total estimated mass flux of petroleum hydrocarbons is 0.3 pounds per day. 4.0 GROUNDWATER REMEDIATION Condor proposes the use of ozone injection to remediate the groundwater impacted by petroleum hydrocarbons at the site. This method injects gaseous ozone into the aquifer to destroy petroleum hydrocarbons. The ozone destroys the hydrocarbons through the process of chemical oxidation, which breaks the hydrocarbons down into carbon dioxide and water. Ozone will be produced by an ozone generator that will be installed on site. The ozone will be transmitted from the ozone generator to the ozone injection wells by buried Teflon tubing. 4.1 OZONE INJECTION WELL INSTALLATION PROCEDURES This section describes the proposed installation of eight ozone injection wells. The proposed locations of the wells are shown on Figure 6 (Appendix A). The ozone injection wells will be installed near the former location of UST#3, MW-1, and MW-2. The ozone injection wells will be spaced approximately 40 feet apart. The expected radius of influence for the wells is 30 feet based on the results of the Soil Vapor Extraction Air Sparge Pilot Test conducted in 2011. The ozone injection wells will be installed using hollow-stem auger drilling methods. Drilling activities will be performed under the supervision of a Condor geologist. The soil cuttings from the borings will be logged in accordance with the Unified Soil Classification System (USCS). Descriptions of soil types encountered will be recorded on geologic logs. Soil samples will be collected from the drill cuttings for the purpose of characterizing the cuttings for disposal. One composite soil sample will be collected from the drill cuttings of each well. All down-hole drilling equipment will be steam cleaned prior to use in each well boring. The drill cuttings and steam cleaning effluent will be placed in Department of Transportation (DOT)-approved 55-gallon drums, sealed, labeled, and left on site pending laboratory analyses. 4.1.1 Site Preparation Condor will complete well installation permit applications and obtain the required permits from the SJCEHD prior to the fieldwork. Condor will coordinate all field activities with the SJCEHD. The proposed well locations will be marked with white paint and Underground Service Alert (USA) will be notified at least 48 hours in advance of the fieldwork to locate and identify underground utilities in and near the work area. Prior to commencement of fieldwork, a tailgate safety meeting will be held and a site- specific Health and Safety Plan will be discussed with, and presented to, all field personnel for their signatures. 4.1.2 Ozone Injection Well Installation Procedures Eight ozone injection wells will be installed at the locations shown on Figure 6 (Appendix A). The ozone injection well borings will be drilled to a total depth of approximately 45 feet bgs. The ozone sparge points will be installed at a depth of approximately 45 feet bgs so the sparge points will be in a well graded sand layer identified during the installation of MW-1 and shown in the Site Conceptual Model (SCM) and Work Plan, dated March 7, 2003, Figure 4, Appendix A, and within the presumed source area shown on Figure 6, Appendix A. The SCM is attached to this Work Plan in Appendix B. The ozone injection wells will be constructed with an 18-inch long, 1.5-inch outside diameter (0.D.) porous Kynar sparge point. Blank 1-inch Schedule 80 PVC casing will be installed above the sparge point to the ground surface. A filter pack of #3 Monterey sand will be placed in the annular space to approximately 1.5 feet above the sparge point while the augers are in place. The depth of the sand in the annulus of the well will 1414, CONDOli CA