83-037 ORD PROVIDING CODE OF ORDINANCES BE AMENDED BY REVISING CHAPTER 31 SECTION 31-1 AND 31-37 THROUGH SECTION 31-43 OF SAID CODE

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CHARGE RATES FOR EXCESSIVE SURCHARGE BODS or TSS BODS Charge T'SS Charge mg/1/million gallons .7339 .5712 4) CALCULATION OF EXCESSIVE STRENGTH SURCHARGE SC_ [ (BODS mg/1 - 250 mg/1) SCRBOD 5 + (TSS mg/1 - 250 mg/1) SCRTSSI X MG SC = Surcharge BOD5 mg/1 = User BODS for surcharge calculation 250 mg/1 = allowable BGD5 and suspended solids concentration without surcharge SCRBOD 5 = graduated charge rate for BOD5 TSS mg/1 = User TSS for surcharge calculation N1G = User wastewater contribution in million gallons for the month or the user water usage whichever is applicable. SCRSS = Graduated charge rate for TSS NOTE: The SCRSS and SCRBOD5 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. I7etermination of monthly average BODc, 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 according 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. 30