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r <br /> Zz"0A <br /> Working to Restore Nature <br /> ATC Application <br /> Unocal Station No 6981 <br /> 4707 Pacific Avenue <br /> Stockton, California <br /> Page Six <br /> INLET CONCENTRATIONS <br /> VOC's Influent Concentration 50% of LEL VOC's (as hexane) <br /> density = 0 222 lb/ft3 LEL = 11% = 11,000 ppm `/,, <br /> (11,000 ft3 VOC) ( 50) 222 Ib VOC (200 ft3 air) 60 mm = 14 7 Ib VOC <br /> 106 ft3airft3VOC min hr hr <br /> = 353 Ib VOC/day <br /> Inlet VOC's @ 50% LEL (as hexane) = (1 1 % "/,* 50) = 5500 ppm `/v <br /> L5500_ft3 VOC) 1222 ]b VOC) = 122 x 10-3 Ib VOC <br /> 106 ft3 air ft3 VOC ft3 air <br /> Inlet Benzene Vapor tests show average Benzene to TPH ratio = 034 <br /> Benzene inlet = (VOC inlet) ( 034) = 12 22 x 10-4 lb VOC 034 lb Benzene <br /> W lb VOC <br /> = 4 2 x 10-' Ib Benzene/ft3 air <br /> OUTLET CONCENTRATIONS <br /> Manufacturers standard destruction efficiency = 99% <br /> VOC <br /> (122 x 10-3 ]b VOC/ft3 air) ( 01) = 122x 1051b VOC/ft3 air <br /> Benzene <br /> (4 2 x 10' Ib Benzene/ft3 air) ( 01) = 4 2 x 107 lb Benzene/ft3 air <br /> VOC Outlet Emission Rate <br /> (122 x 10-' VOC/ft3 air) (200 ft3/min (60 mm/hr) = 146 lb VOC/hr <br /> Benzene Emission Rate <br /> • (4 2 x 10-7 lb Benzene/ft3 air (200 ft3/min) (60 min/hr) _ <br /> 005 Ib Benzene/hr <br />