(A) Annual base rate. The base rate shall include the following items:
(1) Determine the annual OM&R budget.
(2) Allocate total annual OM&R costs to flow, BOD, and TSS proportionately, according to the costs of collection and treatment of flow, BOD, and TSS.
(3) Proportion the flow costs between infiltration/inflow and billable volume. OM&R costs for infiltration and inflow shall be divided equally among all users of the system.
(4) The OM&R costs for administrative and billing shall be divided equally among all users of the system.
Where: Br = Base Rate recovery of costs from infiltration/inflow and administrative services.
(5) The City Council may at their discretion add a sinking fund cost for collection system replacement.
(B) Debt service charge. Debt retirement costs shall be allocated to all users. Two options for the debt service charge are presented in Appendix B.
(C) Calculation of unit costs for treatment of flow, BOD, and TSS. For purposes of determining the proportionate charges, unit costs for treatment of flow, BOD, and TSS shall be determined and fixed annually in the sewer service charge system according to the following procedure. Divide the OM&R costs attributable to billable flow, BOD, and TSS respectively by the total annual billable volume and loadings of flow, BOD, and TSS to arrive at unit costs.
(1) For purposes of determining charges, the following definitions of unit costs shall apply:
Uf = Unit cost for treatment of billable flow in $/CCF.
Ubod = Unit cost for treatment of BOD in $/lb.
Utss = Unit cost for treatment of TSS In $/lb.
(CCF = 100 cubic feet = 748 gallons.)
(2) Unit costs are provided in Appendix A of the sewer service charge system developed with the assistance of the consulting engineer. Subsequent calculations of unit costs shall be according to the substantive intent of this SSCS.
(Ord. 150, passed 7-26-90)