Laserfiche WebLink
under this Order. This Order requires Dischargers to submit monitoring data according to the <br /> requirements contained in the Monitoring and Reporting Program(Attachment E).If monitoring <br /> data indicate significant contamination by metals,pesticides,or other conservative pollutants, <br /> Dischargers authorized under this Order may be required to apply for an individual NPDES pernut. <br /> II. FACILITY DESCRIPTION <br /> The facilities that may be covered under this Order are groundwater treatment facilities located at <br /> active or closed sites with solvent and/or fuel leaks. These groundwater treatment facilities are in <br /> operation to extract and treat groundwater polluted mainly by VOC and/or fuel components. This <br /> Order covers discharges from these facilities to all surface waters such as creeks, streams,rivers <br /> including flood control channels, lakes, or San Francisco Bay. Such discharges may occur directly to <br /> surface waters or through constructed storm drain systems. <br /> A. Description of Wastewater Treatment <br /> Dischargers authorized under this Order typically use aeration and/or granular activated carbon <br /> (GAC) systems to treat their groundwater prior to discharge. Facilities that use other types of <br /> treatment systems that are effective at removal of VOC pollutants may be covered by this Order <br /> subject to the approval of the Executive Officer. The most common VOC pollutants contained in <br /> the influent of these treatment systems are tetrachloroethylene and trichloroethylene. The most <br /> common pollutants contained in groundwater influent that has been contaminated by fuel leaks <br /> are benzene, ethylbenzene,toluene, total xylenes, methyl tertiary butyl ether(MTBE), and other <br /> petroleum hydrocarbons collectively called total petroleum hydrocarbons(TPHs). Other volatile <br /> or semi-volatile organic compounds may also be present in the influent of a subset of facilities <br /> regulated under this permit. Less commonly, inorganic pollutants, such as metals, are present in <br /> the influent and effluent and may be naturally occurring. <br /> Except for some inorganic compounds and some other organic compounds such as 1,4 dioxane, <br /> the concentrations of organic pollutants in the effluents of the discharges are usually below <br /> detectable levels. The Fuel and VOC Dischargers reported design flow rates ranging from 5 gpm <br /> to 840 gpm, and discharge flow rates ranging from 2.5 gpm to 605 gpm. <br /> The reported detection limit for benzene, ethylbenzene,toluene, total xylenes, and most VOC is <br /> 0.5 microgram per liter(ug/L); for MTBE,the reported detection limit ranges from 0.5 to 5.0 <br /> ug/L; for TPH,the reported detection limit is mostly 50.0 ug/L; and the reported detection limits <br /> for semi volatile organic compounds are mostly 5.0 or 10.0 ug/L. <br /> B. Discharge Points and Receiving Waters <br /> The NOI Form(Attachment B)requires every Discharger to provide the discharge location and a <br /> map highlighting the discharge path to surface waters. <br /> C. Summary of Existing Requirements <br /> The effluent limitation contained in the previously issued Fuel(Order No.R2-2006-0075)and VOC <br /> (Order No.R2-2009-0059)General Permits is stunmarized in Table F-2.Except the residual <br /> chlorine effluent limit in the VOC General NPDES pernut,the effluent limitations contained in the <br /> previously issued Fuel and VOC General Pernuts were the same. <br /> Attachment F—Fact Sheet F-6 <br /> For VOC and Fuel General NPDES Permit No.CAG912002 <br />