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Priority Pollutant Removal Efficiencies (%) Through Tertiary Treatment* <br />Priority Pollutant <br />Range <br />Second <br />Decile <br />I <br />Median <br />Eighth <br />I Decile <br />Number of POTWs <br />with Removal Data <br />METALS/NONMETAL INORGANICS** <br />Cadmium <br />33-81 <br />50 <br />50 <br />73 <br />3 of 4 <br />Chromium <br />22-93 <br />62 <br />72 <br />89 <br />4 of 4 <br />Copper <br />8-99 <br />58 <br />85 <br />98 <br />4 of 4 <br />Cyanide <br />20-93 <br />32 <br />66 <br />83 <br />4 of 4 <br />Lead <br />4-86 <br />9 <br />52 <br />77 <br />3 of 4 <br />Mercury <br />33-79 <br />43 <br />67 <br />75 <br />4 of 4 <br />Nickel <br />4-78 <br />17 <br />17 <br />57 <br />3 of 4 <br />Silver <br />27-87 <br />55 <br />62 <br />82 <br />3 of 4 <br />Zinc <br />1-90 <br />50 <br />78 <br />88 <br />4 of 4 <br />ORGANICS** <br />Benzene <br />5-67 <br />40 <br />50 <br />54 <br />2 of 4 <br />Chloroform <br />16-75 <br />32 <br />53 <br />64 <br />3 of 4 <br />1,2-trans-Dichloroethylene <br />50-96 <br />50 <br />83 <br />93 <br />2 of 4 <br />Ethylbenzene <br />65-95 <br />80 <br />89 <br />94 <br />3 of 4 <br />Methylene Chloride <br />11-96 <br />31 <br />57 <br />78 <br />4 of 4 <br />Naphthalene <br />25-94 <br />33 <br />73 <br />86 <br />3 of 4 <br />Phenol <br />33-98 <br />80 <br />88 <br />96 <br />4 of 4 <br />Bis (2-ethylhexyl) phthalate <br />45-98 <br />59 <br />76 <br />94 <br />4 of 4 <br />Butyl benzyl phthalate <br />25-94 <br />50 <br />63 <br />85 <br />4 of 4 <br />Di -n -butyl phthalate <br />14-84 <br />27 <br />50 <br />70 <br />4 of 4 <br />Diethyl phthalate <br />20-57 <br />29 <br />38 <br />50 <br />3 of 4 <br />Tetrachloroethylene <br />67-98 <br />80 <br />91 <br />97 <br />4 of 4 <br />Toluene <br />50-99 <br />83 1 <br />94 <br />97 <br />4 of 4 <br />1,1,1 -Trichloroethane <br />50-98 <br />79 <br />94 <br />97 <br />4of4 <br />Trichloroethylene <br />50-99 <br />62 <br />93 <br />98 <br />4 of 4 <br />* Pollutant removals between POTW influent and tertiary effluent (including final clarification). Based <br />on a computer analysis of POTW removal efficiency data (derived from actual POTW influent and <br />effluent sampling data) provided in U.S. EPA's Fate ofPriority Pollutants in Publicly Owned Treatment <br />Works, TVolumeII(EPA440/1-821303),September 1982. Tertiary treatment was taken to include POTWs <br />with effluent microscreening, mixed media filtration, post aeration, and/or nitrification/denitrification. <br />** For the purpose of deriving removal efficiencies, effluent levels reported as below detection were set <br />equal to the reported detection limits. All tertiary treatment plants sampled as part of the study were <br />considered. <br />Source: U.S. EPA's Guidance Manual on the Development and Implementation of Local Discharger <br />Limitations Under the Pretreatment Program, December 1987, p. 3-58. <br />