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to t) <br /> ATTACHMENT A <br /> REMEDIAL ACTION PERFORMANCE SUMMARY FIRST QUARTER 1995 <br /> SOIL-BASED REMEDIAL SYSTEM <br /> • Site Name Unocal Service Station 2859 Permitting Agency SJVUAPCD <br /> Site Address 1665 Pacific Avenue,Stockton,California ATC No N-3529-1-0 <br /> Abatement Equipment Internal Combustion Engine ATC Expiration Date 12/29/97 <br /> Start-Up Dale 2112196 Estimated Shutdown Date Unknown <br /> REMEDIAL OBJECTIVES <br /> o Migration Control <br /> o Mass Removal <br /> o Regulatory Compliance <br /> OPERATIONAL DATA <br /> Treatment System Data January February March <br /> Operational Status IF Source Test Start-Up Operational <br /> Instantaneous Flow Rate(scfm) 47 J 51 72 Table 1 Page A-2 <br /> TPPH and Benzene Summary January February March <br /> Influent TPPH-gasoline (ppmv) 1,773 898 496 Table 1 Page A-2 <br /> Influent Benzene (ppmv) 22 81 ND Table 1 Page A-2 <br /> Effluent TPPH-gasoline (ppmv) 15 10 80 Table 2 Page A-3 <br /> Effluent Benzene (ppmv) 1 1 1 1 0 22 Cumulative Table 2 Page A-3 <br /> Mass TPPH Removed (Ibs) 00 1 0 1925 1935 Table 1 Page A-2 <br /> Mass Benzene Removed (lbs) 0 E]l 001 1 00 1 01 Table 1 Page A-2 <br /> REMEDIAL ACTION PERFORMANCE EVALUATION <br /> Migration Control The vapor extraction system is effective in controlling migration of petroleum hydrocarbons <br /> in the unsaturated zone <br /> Mass Removal Mass removal is bung achieved Mass removal trend YAII be discussed next quarter,once <br /> system has been operating steadily for a full quarter <br /> Regulatory Compliance During system startup in the first quarter 1996 the sod vapor extraction system operated <br /> in compliance with the San Joaquin Valley Unified Air Pollution Control District requirements <br /> ACTIONSIRECOM MENDATIONS <br /> 0 Continue system operation,adjust equipment as needed to optimize mass removal and meet regulatory compliance <br /> NOTES <br /> scfm =Standard cubic feet per minute <br /> . ppmv=Parts per million by volume <br /> lbs. =Pounds <br /> ND =Not detected above detection limit <br /> Note When appropriate,tabulated data is followed by associated graphical presentation <br /> 3100405A11Q96QPRXLS11Q96 A-1 Apnl26,1996 <br />