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In the treatment systems regulated by this Order,organic compounds,including VOC and <br /> petroleum compounds,are removed from containinated groundwater using such technologies as <br /> air stripping and activated carbon.Treated groundwater is then discharged to surface waters. <br /> When properly designed and operated,these treatment systems can lower the concentration of <br /> such pollutants to levels below analytical detection lunits. <br /> USEPA Region 9 issued a document titled NPDES Permit Limitations for Discharge of <br /> Contaminated Groundwater: Guidance Document(USEPA, 1986) in which USEPA concluded <br /> that the cost of reducing concentrations of most organic compounds commonly detected in <br /> contaminated groundwater to a non-detect concentration of 5 µg/L,and to a non-detect <br /> concentration for vinyl chloride of 1 µg/L,is considered economically achievable. <br /> Based on an understanding that a�ailable treatrnent technologies can economically remove <br /> organic pollutants from contaminated groundwater,the Regional Water Board has established <br /> TBELs using BPJ at 5.0 µg/L far benzene,carbon tetrachloride,chloroform, 1,1-dichloroethane, <br /> 1,2-dichloroethane, 1,1-dichloroethylene, ethylbenzene,methylene chloride,tetrachloroethylene, <br /> Toluene, Cis 1,2-Dichloroethylene,Trans 1,2-Dichloroethylene, 1,1,1-Trichloroethane, <br /> 1,1,2-Trichloroethane,Trichlaroethylene, and total xylenes,and at 1.0 µg/L for vinyl chloride. <br /> Petroleum-based compounds and fuel additives are commonly found at sites with fuel or fuel <br /> VOC corruningled plumes. This Order therefore retains TBELs for TPHs,ethylene dibromide, <br /> and MTBE from the previous Fuel General Permit. Limitations for TPH are 50 µg/L and for <br /> ethylene dibromide and MTBE are 5 µglL,which reflect a level of treated wastewater quality <br /> that is economically achievable by the treatment technologies contemplated by this Order. <br /> Because a nuxnber of facilities covered under the Fuel General Pernut are former semiconductor <br /> manufacturing operations,which used trichlorotrifluoroethane(Freon 113)in a manufacturing <br /> process and have detected concentrations of this compound in containinated groundwater,this <br /> Order retains the effluent limitation from the previous Fuel General Permit for Freon.The <br /> effluent limitation of 5 µg/L reflects a level of treated wastewater quality that is economically <br /> achievable by the treatment technologies contemplated by this Order. <br /> Table F-3,below,suxrunarizes the TBELs established by this Order. <br /> Table F-3. Summar of Technolo -Based Effluent Limitations <br /> No. Compound Limitations Established by BPJ <br /> USEPA RWB <br /> 1 Benzene 5 --- <br /> 2 Carbon Tetrachloride 5 --- <br /> 3 Chloroform 5 --- <br /> 4 1,1-Dichloroethane 5 --- <br /> 5 1,2-Dichloroethane 5 --- <br /> 6 1,1-Dichloroethylene 5 --- <br /> 7 Ethylbenzene 5 --- <br /> Attachment F—Fact Sheet F-14 <br /> For VOC and Fuel General NPDES Permit No.CAG912002 <br />