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ATTACHMENT A REMEDIAL ACTION PERFORMANCE SUMMARY SECOND 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 Apnl May June Operational Status59%operational 93%operational 72%oper Instantaneous Flow Rate(scfm) 1 !N1 03 120 61 Table 1 Page A-2 TPPH and Benzene Summary April May June Influent TPPH-gasoline (ppmv) 591 331 260 Table 1 Page A-2 Influent Benzene (ppmv) ND ND 075 Table 1 Page A-2 Effluent TPPH-gasoline (ppmv) 15 10 so Table 2 Page A-3 Effluent Benzene (ppmv) 1 1 1 1 022 Cumulative Table 2 Page A-3 Mass TPPH Removed (Ibs) 217 4 2581 3451 1,014 1 Table 1 Page A-2 Mass Benzene Removed (Ibs) 07411 0 98 112 3 85 Table 1 Page A-2 REMEDIAL ACTION PERFORMANCE EVALUATION Mass Removal The amount of hydrocarbon mass removed during the reporting pend has been slightly reduced due to the decrease in influent hydrocarbon concentrations Apprommately 820 6 pounds of TPPH-gasoline and 2 84 pounds of benzene were removed during the current reporting period Regulatory Compliance The soil vapor extraction system operated in compliance with the San Joaquin Valley Unified Air Pollution Control District requirements thereby achieving compliance ACTIONSIRECOM MENDATIONS 0 PACIFIC will evaluate continuing operation of the SVE system through the third quarter of 9996 NOTES scfm =Standard cubic feet per minute ppmv=Parts per million by volume lbs =Pounds ND =Not detected above detection lima Note When appropriate,tabulated data is followed by associated graphical presentation 3100405Al2Q96QPR XLS12096 A-1 September 10, 1996