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Chevron Products Company Page 3 Chevron Service Station#9-0557,1outh Center Street,Stockton,California November 28,2001 summarized in Appendix A. A generalized sparge point construction detail and ozone generation/control panel diagrams are included as Appendix B. ■ Land Surveying. Following installation, the OS wells will be located using either a global positioning system (GPS) or a licensed land surveyor's services. ■ Ozone Conveyance Piping and Test Equipment. Double-contained tubing for the conveyance.of ozone-enriched air to the OS sparge points will be installed in shallow trenches in the approximate locations shown on Figure 2. The approximate location of the proposed ozone generation panel is also shown on Figure 2. Details of the C- Spargefrm panel provided by McCulloch Environmental Equipment Sales (MESS) are provided in Appendix B. Pilot Testing OS pilot testing will be conducted in the phases summarized below. • Phase 1 —Baseline (Pre-Ozone Sparging Test) Phase. Prior to the initiation of OS pilot testing, seven wells (MW-1, MW-2, MW-9, MW-9S, MW-10, MW-11, and proposed well MW-13) in the vicinity of the treatment area will be monitored for dissolved oxygen (DO) concentrations,pH, oxidation-reduction potential (ORP),,and depth-to-water(DTW) with direct-reading instruments. Ferrous iron concentrations will be monitored with a Hach field test kit. In addition, groundwater samples will be collected from the seven wells and sent to a laboratory to be analyzed for total petroleum hydrocarbons quantified as gasoline (TPHg), as diesel (TPHd), as motor oil (TPHmo), benzene, toluene, ethyl-benzene, xylenes (BTEX), and fuel oxygenates (Appendix A). • Phase 2—Test Equipment and Setup. A C-Spargefm (Appendix B) will be used to generate and deliver an air/ozone mixture to each of the sparge points. The panel will include an oxygen enrichment device to increase the concentration of ozone delivered to the sparge points. The panel will be capable of injecting an air/ozone mixture to a maximum of six sparge points, each sparge point individually. The panel will be capable of injecting an air/ozone mixture to a maximum of six of the eight individual sparge points. No differential pressure adjustments are required for air/ozone delivery pressures from the panel. Once powered, the ozone generator will deliver the minimum pressure to each sparge point required to introduce air/ozone to the formation. An internal pressure gauge continuously meters the actual delivery pressure of air/ozone. According to MEES, the ozone generator should continuously deliver between 4 and 6 scfm air/ozone to each sparge point. After setup of the panel and its connection to each of the sparge points, all test equipment, including monitoring equipment, will be tested to verify proper operation. I:\Chevron\90557\REPORTS\Feasibility Study\03_Addendum.doc