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ATTACHMENT A REMEDIAL ACTION PERFORMANCE SUMMARY FOURTH QUARTER 1996 SOIL_-BASED REMEDIAL SYSTEM Site Name Unocal Service Station 2859 Permitting Agency SJVUAPCD Site Address 1665 Pacific Avenue,Stockton,California ATC No N-3529-1-0 Abatement Equipment Internal Combustion Engine ATC Expiration Date 12/29/97 Start-Up Date 2112196 Estimated Shutdown Date Unknown REMEDIAL OBJECTIVES o Mass Removal o Regulatory Compliance OPERATIONAL DATA Treatment System Data October November December Operational Status Operational Shut Down Down Instantaneous Flow(tate(scfm) 78 80 NIA Table 1 Page A-2 TPPH and Benzene Summary October November December Influent TPPH-gasoline (ppmv) 520 567 709 NS NS NS Table 1 Page A-2 Influent Benzene (ppmv) 32 52 29 NS NS NS Table 1 Page A-2 Effluent TPPH-gasoline (ppmv) 35 161 85 NS NS NS Table 2 Page A-3 Effluent Benzene (ppmv) 1 5 29 18 NS NS NS Cumulative Table 2 Page A-3 Mass TPPH Removed (lbs) 6353 1642 0 0R�l 744 5 Table 1 Page A-2 Mass Benzene Removed (lbs) HOE-- 0 85 0 001 97 Table 1 Page A-2 REMEDIAL ACTION PERFORMANCE EVALUATION Mass Removal Approximately 800 pounds of TPPH and 4 2 pounds of benzene were removed by the SVE system during the current reporting period Regulatory Compliance The SVE system began the current penod in compliance with a#permit discharge"a6ons, but the last two events on 10/23/96 and 11/06/96 feff below the 95 percent destructron efficiency and also exceeded the total daily VOC emissions limrtabon of 2 pounds per day The system was shutdown in November 1996 ACTIONSIRECOM MENDATIONS NOTES scfm =Standard cubic feet per minute ppmv=Parts per million by volume •' lbs =Pounds NIA =Not applicable or not available NS =Not sampled Note When appropriate,tabulated data is followed by associated graphical presentation 3100405A14Q96QPR XLS A-1 February 4, 1997