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s Chevron Products Company ( ) Page 4 Chevron Service Station#9-0557,l ouch Center Street,Stockton,California November 28,2001 The ozone sparging equipment will be inspected through a short duration (i.e. 0.5 to 1-hour) test to verify that the system will operate correctly for the long-term testa During this inspection, all system components will be checked for proper function and conveyance piping integrity will be checked. ■ Phase 3—OS Pilot Testing. After the equipment testing, ozone sparging will begin for a three-month period. The cycle timer will be adjusted prior to startup to deliver air/ozone to each of the wells, one at a time, for approximately 10 to 20 minutes each cycle. The`off-cycle for the ozone generator will be adjusted such that one full cycle through the six sparge points will be 180 minutes. During the OS test, groundwater chemical and physical parameters will be monitored periodically to help evaluate the results of the test. DTW and induced pressure measurements will be collected from each of the seven monitoring wells at the frequencies summarized below: ■ Once every hour for the first eight hours of testing; ■ Once per week during the first month of operation: and, ■ Once per month thereafter. Wellhead pressures will be collected by placing a well cap, connected to a low- pressure magnahelic pressure gauge, on to each of the monitoring wells within the test area. Once the wellhead pressure is recorded, the well cap will be removed to allow water level measurement with a standard water level sounding meter. After the water level measurement has been recorded, the well cap will be replaced until the next monitoring event. Groundwater samples will be collected from wells within the test area following the first week of pilot testing, and monthly during the balance of the pilot test period. Groundwater samples will be analyzed in the field for pH, ORP, DO concentrations, and ferrous iron concentrations. Additionally, groundwater samples will be analyzed for TPHg, TPHd, TPHmo,BTEX, and fuel oxygenates. ■ Phase 4—Post Testing Phase. Both immediately following the conclusion of OS pilot testing and one month after the conclusion of pilot testing, SECOR will collect groundwater samples and analyze in the field for pH, ORP, DO concentrations, and ferrous iron concentrations. Additionally groundwater samples will be collected and sent to a laboratory to be analyzed for TPHg, TPHd, TPHmo, BTEX, and fuel oxygenates. Presentation of Findings Findings from the OS pilot test will be presented in the CAP, along with the results of the other feasibility tests and monitoring well installations, as described in the Work Plan. l:\Chevron\90557\REPORTS\Feasibility Study\03_Addendum.doc