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California Environmentai Protection Agency flartment of Toxic Substances Control <br /> HAZARDOUS WASTE FACILITY STANDARDIZED PERMIT UNIT-SPECIFIC FORM <br /> UNIT NAME Waste Treatment Area <br /> I. TREATMENT PROCESS <br /> PROCESS DESCRIPTION PROCES #OF PROCESS UNIT OF <br /> S CODE EQUIPEMENT DESIGN MEASURE <br /> Waste Water Treatment T2 3 10,500 g <br /> IL WASTE TREATED <br /> WASTE CODE(S) WASTE PROCESS MAX. ESTIMATED UNIT OF <br /> RCRA CA DESCRIPTION CODE(S) CONCENTRATION QUANTITY MEASURE <br /> 431 Phosphate Sludge T2 4 g <br /> D0007 Chromium T2 5 mg/ 1 10 g <br /> (Modify the form if more than 6 waste streams are treated by this process) <br /> III. NARRATIVE DESCRIPTION OF TREATMENT UNIT <br /> Phosphate Sludge:Removal of metals from alkaline wash solution <br /> 1.Allow to settle overnight.2.Decant water leaving solid at bottom.3.Adjust pH if necessary. <br /> Chromium:Reduction of Chromium VI to Chromium 111. <br /> 1.Addition of Sodium Metabisulphite to Chromic acid <br /> 2.Addition of Sodium hydroxide to raise pH to allow precipitation of metal <br /> 3.Filter press to remove precipitate <br /> DTSC 1093A(0812006) DRAFT Page 9 <br />