(A) (1) An annual review of the user charge is required in order to evaluate the OM&R costs and OM&R revenues; and, if a rate increase or decrease is necessary, determine the amount.
(2) This annual review should also ensure that proportionality of the user charge system is maintained.
(B) Each user is to be notified annually, in conjunction with a regular bill, of the sewer service charge and that portion of the sewer service charge that is attributable to OM&R costs of the wastewater treatment system.
(C) The monthly sanitary sewer charge shall be calculated on the volume of wastewater discharged, directly or indirectly, into the sewage system and shall be measured by water used by each user as shown by the water meter readings. The sanitary sewer service charge shall consist of the sum of the OM&R charge, the surcharges for extra strength wastes, and the debt service/capital improvements charge calculated as follows:
(1) OM&R charge: OMR = (A/Q) x M, where:
(a) A = Total monthly operation, maintenance and replacement costs for the wastewater treatment plant and collection system;
(b) Q = Total number of metered gallons of water sold to users connected to the sanitary sewer system; and
(c) M = Monthly metered water usage per user. There shall be a minimum charge per month per user of 1,500 gallons usage, regardless of actual consumption.
(2) Extra strength waste surcharge (P): P = B x BOD + C x SS, where:
(a) BOD = Pounds of biochemical oxygen demand per month in excess of 200 mg/l concentration in the wastewater;
(b) SS = Pounds of suspended solids per month in excess of 250 mg/l concentration in the wastewater;
(c) B = Total expenditures per pound of BOD to collect, convey and treat the wastewater; and
(d) C = Total expenditures per pound of SS to collect, convey and treat the wastewater.
(3) Debt service/capital improvements charge: DSC = D/(N x 12 months per year) + I, where:
(a) D = Total amortized annual debt service payments for the sewage disposal system;
(b) N = Total number of users in the system; and
(c) I = Total charge for capital improvements to the sewage disposal system.
(4) The monthly sewer service charge shall be calculated as follows: Charge = OMR + P + DSC.
(Prior Code, § 5.04.09)