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APPENDIX R - <br />PRIORITY POLLUTANT REMOVAL EFFICIENCIES <br />Priority Pollutant Removal Efficiencies (%) Through Primary Treatment* <br />Priority Pollutant <br />Median <br />Number of POTWs with <br />Removal Data** <br />METAUNONMETAL INORGANICS <br />Cadmium <br />15 <br />6 of 40 <br />Chromium <br />27 <br />12 of 40 <br />Copper <br />22 <br />12 of 40 <br />Cyanide <br />27 <br />12 of 40 <br />Lead <br />57 <br />1 of 40 <br />Mercury <br />10 <br />8 of 40 <br />Nickel <br />14 <br />9 of 40 <br />Silver <br />20 <br />4 of 40 <br />Zinc <br />27 <br />12 of 40 <br />ORGANICS <br />Benzene <br />25 <br />8 of 40 <br />Chloroform <br />14 <br />11 of 40 <br />1,2-trans-Dichloroethylene <br />36 <br />9 of 40 <br />Ethylbenzene <br />13 <br />12 of 40 <br />Naphthalene <br />44 <br />4 of 40 <br />Phenol <br />8 <br />11 of 40 <br />Butyl benzyl phthalate <br />62 <br />4 of 40 <br />Di -n -butyl phthalate <br />36 <br />3 of 40 <br />Diethyl phthalate <br />56 <br />1 of 40 <br />Tetrachloroethylene <br />4 <br />12 of 40 <br />1,1,1 -Trichloroethane <br />40 <br />10 of 40 <br />Trichloroethylene <br />20 <br />12 of 40 <br />Pollutant removals between POTW influent and primary effluent. From Fate ofPriority Pollutants <br />in Publicly Owned Treatment Works, Volume I(EPA 440/1-82/303), U.S. Environmental Protection <br />Agency, Washington, D.C., September 1982, p. 61. <br />* * Median removal efficiencies from a data base of removal efficiencies for 40 POTWs. Only POTWs <br />with average influent concentrations exceeding three times each pollutant's detection limit were <br />considered. <br />Source: U.S. EPA's Guidance Manual on the Development and Implementation ofLocal Discharger <br />Limitations Under the Pretreatment Program, December 1987, p. 3-55. <br />R-1 <br />