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Workplan for Ozone Sparging Moore Petroleum Bulk Plant,5491 F Street,Banta,California Page 4 second quarter monitoring results, the current remediation system has removed 4,369 pounds TPHg and 1.4 pounds benzene (Table 2). Due to the presence of sensitive receptors down gradient of the site, natural attenuation is not recommended as a remediation alternative for this site. And due to the small amount of influence recorded during pumping tests at the site, pump and treat would not be as effective a remedial alternative as the use of ozone sparging. Therefore, Apex recommends the installation of 10 ozone sparge wells and an ozone sparging system to augment the remediation of petroleum-impacted groundwater via SVE beneath the subject site. All work will be conducted in accordance to Apex SOPS included as Appendix A. CONSTRUCTION AN D.INSTALLATION Apex will obtain well permits in accordance with SJCEHD and pre-approval from the California Underground Storage Tank Cleanup Fund for the work described in this Workplan prior to proceeding. Air Sparge Point Installations Apex proposes to 'install an ozone sparge system to augment groundwater remediation at the site. Ozone sparging will oxidize petroleum constituents in groundwater and disperse the byproducts, carbon dioxide and water, into the.vadose zone, where they will be collected by the SVE system. Apex proposes to install up to 10 ozone sparge points-on the subject property(OS-1 through OS- 10) at the locations identified on Figure 3. The sparge points will be installed and developed in accordance with Apex SOP provided in Appendix A. An eight-inch borehole will be advanced to approximately 25 feet below ground surface (bgs) using hollow stem auger drilling equipment. Soil samples will be collected at 5-foot intervals for classification, field screening and chemical analysis. Soil samples will be classified by the Unified Soil Classification System. Field screening will consist of soil headspace analysis using a portable photoionization detector.. A minimum of two samples per sparge well, including one sample from the capillary fringe and one sample from total depth, will be collected for chemical analysis. One sparge point will be installed per boring. The sparge point will consist of an 18-inch long by 2-inch diameter diffuser. A 3/4-inch diameter Schedule 40 PVC riser will connect to the diffuser and extend to surface. The filter pack will be placed from one foot below each diffuser to two feet above. A two feet thick bentonite seal will be placed on top of the filter pack. A neat cement sanitary seal will be placed from the top of the bentonite seal to the surface. The wellheads will be secured with a locking, water-tight cap and a traffic-rated wellhead vault box which will be installed to be flush with the ground surface. Construction specifications for a typical ozone sparge well are shown on Figure 4.