For industrial wastes which do not contain substances recited in § 360-17 of this Part 2 above the limits recited in that same section, and in addition to which the said industrial wastes do not exceed a discharge of 10,000 gallons in any one day, the biochemical oxygen demand does not exceed 600 mg/l, the suspended solids do not exceed 500 mg/l, and the chlorine demand does not exceed 30 mg/l, for which the customer has received a written permit accepting said waste for discharge to the public sanitary sewerage system from the Borough, the following charges shall be applied and added to the rate schedule set forth in § 360-28 of this Part 2: for each mg/l of biochemical oxygen demand in excess of 300 mg/l a charge of 1/2% shall be added to the rate charged in § 360-28 herein, and in addition for each mg/l of suspended solids in excess of 250 mg/l a charge of 1/10% shall be added to the rate charged in § 360-28 herein, and in addition for each mg/l of chlorine demand in excess of 15 mg/l a charge of 1/2% shall be added to the rate charged in § 360-28 herein.
For any industrial waste exceeding the volume of 10,000 gallons per day, or a biochemical oxygen demand of 600 mg/l or a suspended solids content in excess of 500 mg/l, or a chlorine demand in excess of 30 mg/l which has been requested to be discharged to the public sanitary sewerage system, the charges for treating such waste, if accepted by the Borough, will be determined by separate agreement with the customer based upon the cost of providing such service.
The strength of any industrial waste, discharged to the public sanitary sewerage system, shall be determined at least once annually, from samples taken at a sampling point mutually agreed upon by the Borough Council and the producer of such waste, either: a) by suitable sampling and analysis of the industrial waste for a three-day period during which time the strength of such waste being discharged or production in the industry is at its maximum; or b) by relating production and industrial waste strength at the time of sampling to waste strength at maximum production of the industry if sampling is not performed at the time of maximum production; or c) from estimates; or d) from relationships of products produced to strengths of industrial waste for those industries where such relationships have been established. In establishing industrial waste strengths for treatment service charge purposes, the analysis shall be made by an acceptable method.