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CHtDIATANCE NQ. 3158 Page ? (k) The lir!iits of toxic wastes discharged into the public sanitary sewer system shall not exceed the following tentative limits as received at the treatment works: Iron 15 ppm Zinc 2 ppm Cyanide 1 ppm Copper 1 ppan Ptickel 3 ppm Chromitnn (Haxavalent) 2 ppm Chromium (Trivalent ) 1 ppm Phenols 10 ppm Lead 0.5 Ppm Cadm3um It ppm If the conceritration of any industrial waste exceeds the li.m3.ts stipul.ated above, as recaived at tha municipal sewage treatment plant.9 the ]argest contributor of such waste (s) followed in order by the next largest contributors shall reduces by aceeptable pre- treatment and/or flow regulation or botho the amDunts waated ta the public aewer until the aggregate of RrV such waste ooncentration at the treatment works shall not exceed the above prescribed limits. 00 Any wastes which have excessive Volume; B. 00 D.,• Color; ChlorirLe Requiremente, concentration of settleable sol3.ds; or have unusual conditions such as suspended solids af an a.nert nature; or tatal dissolved solids which are ob3ectionable arui can not be handled at the sewage treatment plant ar be removed in ths treatment process; shall be sub3ect to specisl review by the Service Director .for: (1) Approval or rejection of admission to the public sewers; or (2) Modification at the point of origin to permit aclmission; or (3) Pre-»treatment by the Industry to permit admission, (m) Arry long half life (over 100 days) of toxic radio-active isoi:opes, without special permit. The radio-active isotopes I 131 and P 32 used in hospitals ar.e not prohibited if properly diluted at the source and provided permission is obtained from the Se,rvice Dir ector to discharge these wastes to the sewer. (n) .Any water or waste that for a duration of 15 minutes has a aoncentration greater than 3 ti.mes that which is specified for suspended solids and B.O.D. under Section 21 and/or which is discharged continuously at a rate exceeding 200 gallons per minuteo will be unaeceptabl.e. Section 20: GREASE, OIL AND S.AND INTERCEPTQRS. Grease, oils and sand interceptors sh.all be prov3.ded when, in the opinion of the ServiQe Dixector, they are necessar,y for the proper handling of ?