83-012 ORD ARTICLE III SEWER USE ORDINANCE

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CHARGE RATES FOR EXCESSIVE SURCHARGE BOD5 or TSS BODS Charge TSS Charge mg/1/million gallons 4) CALCULATION OF EXCESSIVE STRENGTH SURCHARGE SC- [(F'OD5 mg/1 - 250 mg/1) SCRBOD 5 +(TSS mg/1 - 250 mg/1) SCRTSSI X P,hG SC = Surcharge BOD5 mg/1 = User BOD5 for surcharge calculation 250 mg/1 = allowable BODS and suspended solids concentration without surcharge SCRBOD = graduated charge rate for BODS 5 T5S mg/1 = User TSS for surcharge calculation MG = User wastewater contribution in million gallons for the month or the user water usage whichever is applicable. SCP.SS = Graduated charge rate for 'I'SS NOTE: The SCRSS and SCRBODS are rates based on one (1) mg/1 in one (1) million gallons of wastewater. 5, SHORTENED CAPACITY LIFE SURCHARGE Since BOD and SS concentrations in excess of 250 mg/1 will tend to use up the capacity of the treatment plant, there is a cost incurred for the shortened useful capacity of the treatment plant, which shall be recovered as follows: A. Determination of monthly average BOD5 of the treatment plant influent through twenty-four hour composite sampling and lab analysis reported in pounds per day. B. Using a predetermined strength for normal domestic wastewater from the City of Paris, Paris, Texas, industrial contribution will be determined by calculating the difference between the actual BOD and SS received and the amount that should have been received accarding to normal domestic strength. C. Each month, using the plant design capcity, the amount in excess of normal domestic wastewater will be determined as a percentage of plant capacity; percentage will be assumed to be the reduction in useful plant capacity life, to be converted to years using plant design criteria. D. A difference in debt services due to treatment plant between designed useful capacity life and calculated useful capacity life for that month using the CRF Formula i(l+i) n (l+i~~ 1 will be determined. 26