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28. pH: A measure of the acidity or alkalinity of a substance, expressed in standard units, neutral wastewaters are numerically equal to 7 which the number increases to show increasing alkalinity and decreases to show increasing acidity. 29. Pollutants: Any dredged spoil, solid waste, incinerator residue, sewage, garbage, sewage sludge, munitions, medical wastes, chemical wastes, industrial wastes, biological materials, radioactive materials, heat wrecked or discharged equipment, rock, sand, cellar dirt and agricultural wastes. 30. POTW Definition. The term "POTW" (Publicly Owned Treatment Works) is defined in 40 CFR 403.3 (o). The term 'Publicly Owned Treatment Works" or POTW means a treatment works as defined by Section 212 of the Act, which is owned by a State or municipality (as defined by Section 502 (4) of the Act). This definition includes any devices and systems used in storage, treatment, recycling and reclamation of municipal sewage or industrial wastes of a liquid nature. It also includes sewer, pipes and other conveyances only if they convey wastewater to a POTW Treatment Plant. The term also means the municipality as defined in Section 502 (4) of the Act, which has jurisdiction over the indirect discharges to and the discharges from such a treatment works. 31. Pretreatment or Treatment: The reduction of the amount of pollutants, the elimination of pollutants, or the alteration of the nature of pollutant properties in wastewater, thereby rendering them less harmful to the municipal wastewater system prior to introducing such pollutants into the system. This reduction or alteration can be obtained by physical, chemical or biological processes, by process changes, or by other means, except by diluting the concentration of the pollutants unless allowed by an applicable pretreatment standard. 32. Pretreatment Standard and Requirements. Any substantive or procedural requirement related to pretreatment, including National Pretreatment Categorical Standards and Prohibitive Discharge Standards, imposed on an industrial user established pursuant to 40 CFR 403.5 and the County's local limits. The more stringent standard shall apply. 33. Prohibited Discharge Standards or Prohibited Discharges: Absolute prohibitions against the discharge of certain defined types of industrial wastewater, these prohibitions appear in Section 21-91 of this ordinance. 34. Utilities Department Director: The person designated by the Board of County Commissioners to administer this ordinance, or his designee. 35. Residential Type Users: Users only contributing domestic sewage wastewater to the municipal wastewater system. E.V653\REP0R'P0RDINANC.I 5