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• ORDINANCE NO. / Page 5 (3) objectionable or toxic substances, exerting an excessive chlorine requirement, to such degree that any such material received in the composite wastewater treatment works exceeds the limits established by the Approving Authority for such materials; or (4) obnoxious, toxic or poisonous solids, liquids, or gases in quantities sufficient to violate the provisions of Section 2(a). (c) No waste, wastewater, or other substance may be dis- charged into public sewers which has a pH lower than 5.5 or higher than 9.5, or any other corrosive property capable of causing damage or hazard to structures, equipment, and/or personnel at the wastewater facilities. (d) All waste, wastewater, or other substance containing phenols, hydrogen sulfide, or other taste-and-odor pro- ducing substances, shall conform to concentration limits established by the Approving Authority. After treatment of the composite wastewater, concentration limits may not exceed the requirements established by state, federal, C or other agencies with jurisdiction over discharges to receiving waters. SECTION 4. HAZARDOUS METALS AND TOXIC MATERIALS. (a) No discharges may contain concentrations of hazardous metals other than amounts specified in subsection (b) of this section. (b) The allowable concentrations of hazardous metals, in terms of milligrams per liter (mg/1), for discharge to inland or tidal waters, and determined on the basis of individual sampling in accordance with "Standard Methods" are: Not To Exceed Daily Grab Metal Average Composite Sample (1) Arsenic 0.1 0.2 0.3 (2) Barium 1.0 2.0 4.0 (3) Cadmium 0.005 0.1 p.2 (4) Chromiu:~n 0.5 1.0 5.0 ___ ( 5 ) Copper 0.5 1.0 2 .0 (6) Lead 0.5 1.0 1.5 (7) Manganese 1.0 2.0 3.0 (8) Mercury 0.005 0.005 0.01 (9) Nickel 1.0 2.0 3.0 (10) Selenium 0.05 0.1 0.2 (11) Silver 0.05 0.1 0.2 (12) Zinc 1.0 2.0 6.0 (Note: These concentration parameters and rules governing same are promulgated under authority of Sections 5.131 and 5.132, Texas Water Code - HAZARDOUS METALS and in accordance with Texas Department of Water Resources Rule 156.19.) (c) No other hazardous metals or toxic materials may be dis- charged into public sewers without a permit from the Approving Authority specifying conditions of pretreat- ment, concentrations, volumes,. and other applicable pro- • visions. ~~