Laserfiche WebLink
inland surface waters and enclosed bays and estuaries of the San Francisco Bay Region, <br /> although Tables 3-3 and 3-4 of the Basin Plan include numeric objectives for certain of <br /> these priority toxic pollutants,which supersede criteria of the CTR(except in the South <br /> Bay south of the Dumbarton Bridge). <br /> Human health criteria are further identified as "water and organisms" and"organisms <br /> only."The CTR criteria applicable to "water and organisms" are applied in the <br /> Reasonable Potential Analysis (RPA) for discharges to receiving waters with a MLJN <br /> designation, and criteria applicable to"organisms only"were used in the RPA for <br /> discharges to receiving waters that are not MUN-designated. <br /> c. NTR. The NTR establishes numeric aquatic life criteria for selenium and numeric <br /> "organisms only"human health criteria for 33 toxic pollutants for waters of San <br /> Francisco Bay upstream to, and including Suisun Bay and the San Joaquin-Sacramento <br /> River Delta. <br /> d. Sediment Quality Objectives. The Water Quality Control Plan for Enclosed Bays and <br /> Estuaries—Part 1, Sediment Quality contains a narrative WQO, "Pollutants in sediments <br /> shall not be present in quantities that, alone or in combination, are toxic to benthic <br /> communities in bays and estuaries of California."This WQO is to be implemented by <br /> integrating three lines of evidence: sediment toxicity,benthic community condition, and <br /> sediment chemistry. The policy requires that is the Regional Water Board determines that <br /> a discharge has reasonable potential to cause or contribute to an exceedance of this <br /> WQO, it is to impose the WQO as a receiving water limit. <br /> e. Basin Plan Receiving Water Salinity Policy. The Basin Plan(like the CTR and the <br /> NTR) states that the salinity characteristics (i.e., freshwater vs. saltwater) of the receiving <br /> water are to be considered in determining the applicable WQOs. Freshwater criteria <br /> apply to discharges to waters with salinities equal to or less than one part per thousand <br /> (ppt) at least 95 percent of the time. Saltwater criteria apply to discharges to waters with <br /> salinities equal to or greater than 10 ppt at least 95 percent of the time in a normal water <br /> year. For discharges to water with salinities between these two categories, or tidally <br /> influenced freshwaters that support estuarine beneficial uses,the WQOs are the lower of <br /> the salt or freshwater WQOs (the latter calculated based on ambient hardness) for each <br /> substance. <br /> Receiving waters considered by for this permit are the San Francisco Bay and other <br /> estuarine and tidally influences waters, and inland freshwaters. The Basin Plan <br /> implements State Water Board Resolution No. 88-63, which establishes State policy that <br /> all waters,with certain exceptions, should be considered suitable or potentially suitable <br /> for municipal or domestic supply(MUN). Because of marine influence on all reaches of <br /> San Francisco Bay and other tidally influenced waters, total dissolved solids levels <br /> exceed 3,000 mg/L and thereby meet an exception to State Water Board Resolution No. <br /> 88-63. The RPA therefore separately considered criteria that were applicable to receiving <br /> waters with a MLTN designation and to receiving waters that are not MUN-designated. <br /> Attachment F—Fact Sheet F-17 <br /> For VOC and Fuel General NPDES Permit No.CAG912002 <br />