(A) Each user discharging wastes into the collection system shall be subject to a Strength of Waste Surcharge, in addition to other sewage service charges imposed by this chapter, based on the following minimum strength characteristics to the extent that such wastes are in concentrations greater than:
(1) Biochemical oxygen demand of' 300 milligrams per liter.
(2) Chemical oxygen demand of 600 milligrams per liter.
(3) Suspended solids content 300 milligrams per liter,
(4) Phosphorus content of 10 milligrams per liter.
(5) Ammonia content of 25 milligrams per liter.
(B) Strength of waste surcharge inside and outside city. In the event any user contributes waste having strength of sewage in excess of the concentrations set forth in subsection (A), a surcharge based on the following unit process charges will be in effect for all waste found to be in excess of limitations:
Unit of Measure | Effective 2020 | Effective January 1, 2021 | Effective January 1, 2022 | Effective January 1, 2023 | Effective January 1, 2024 | |
Suspended Solids | Per pound per month | $0.1964 | $0.2026 | $0.2090 | $0.2156 | $0.2224 |
Biochemical Oxygen Demand | Per pound per month | $0.1504 | $0.1551 | $0.1600 | $0.1651 | $0.1702 |
Phosphorus | Per pound per month | $1.9337 | $1.9946 | $2.0574 | $2.1221 | $2.1889 |
Ammonia | Per pound per month | $0.3407 | $0.3514 | $0.3625 | $0.3739 | $0.3857 |
(C) The surcharge shall be determined as follows: the excess pounds of BOD or COD (whichever results in the higher charge) suspended solids, phosphorus and ammonia will each be computed by first multiplying the user's billing sewage volume measured in units of 100 cubic feet for the current billing period by the factor of 0.0062321 and then multiplying this product by the difference between, (a) the concentrations measured in milligrams per liter, of the BOD (or COD), suspended solids, phosphorus and ammonia respectively in the user’s sewage, and (b) the allowed concentrations set out in § 51.072(A). The surcharge for each constituent will then be determined by multiplying the excess pounds of each constituent by the appropriate rate of surcharge. In the event COD measurement is used, as hereinbefore provided, 50% of the excess pounds measured will be used to compute the equivalent BOD charge.
(Ord. G-19-14, passed 7-22-14; Ord. G-6-20, passed 2-25-20)