(A) (1) Users of the city wastewater treatment works shall be identified as belonging to one of the following user classes:
(a) Residential:
1. Normal residential;
2. Mobil home residential;
(b) Commercial;
(c) Industrial;
(d) Institutional;
(e) Governmental.
(2) The allocation of users to these categories for the purpose of assessing user charges and debt service charges shall be the responsibility of the City Clerk. Allocation of users to user classes shall be based on the substantive intent of the definitions of these classes contained herein.
(B) The user shall pay operation, maintenance, and replacement costs in proportion to the user's proportionate contribution of wastewater flows and loadings to the treatment plant, with the minimum rate for loadings of BOD, TSS, and TKN being the rate established for concentrations of 228 mg/l BOD and 204 mg/l TSS (for example, normal domestic strength wastewater).
(C) (1) Unit costs for fixed service and treatment of flow, BOD, TSS, and TKN shall be determined and fixed annually in the Sewer Service Charge System according to the following procedures:
(a) Determine the annual OM&R budget;
(b) Allocate total annual OM&R costs to fixed service, flow, BOD, and TSS, proportionately; according to the costs of administration and collection and of the specific treatment processes required to affect or reduce flow, BOD, and TSS;
(c) Divide the OM&R costs attributable to fixed service, flow, BOD, and TSS, respectively, by the total annual billable connections, volume and loadings of flow, BOD, and TSS to arrive at unit costs;
(d) Determine the wastewater volume charge in accordance with the methodology developed in the Sewer Service Charge System report.
(2) For purposes of determining user charges, the following definitions of unit costs shall apply:
UFS = Unit cost for fixed service in $/billing period
VUC = Wastewater volume charge in $/1,000 gals.
UF = Unit cost for treatment of flow in $/1,000 gals.
UBOD = Unit cost for treatment of BOD in $/lb.
UTSS = Unit cost for treatment of TSS in $/lb.
(3) Estimated unit costs for startup are provided in the Sewer Service Charge System. Subsequent calculations of unit costs shall be according to the substantive intent of this SSCS.
(D) User charges for users contributing normal domestic strength wastewater:
(1) Calculating billable flows and loadings.
(a) The billable amount of flow will be calculated from the volume of metered water usage. For residential users and non-residential users discharging NDSW, billable flow shall be equal to monthly water usage measured throughout the year.
(b) For users discharging NDSW but not connected to the city water system, the billable amount of flow will be calculated from the volume of metered water usage or, at the discretion of the city, from the measurement of effluent flow at the user's point of discharge. Measurements shall be according to a regular program prescribed by the city.
(c) Determination of loadings from metered water usages: the billable amounts of BOD and TSS will be calculated from the volume of metered water usage, as determined above, where the billable quantities will be those attributable to a wastewater concentration of 228 mg/l BOD and 204 mg/l TSS (for example, normal domestic strength wastewater).
(2) Calculating user charges.
UC(NDS) = UFS + (VUC x F)
Where: UC(NDS) = User charge for treatment of normal domestic strength wastewater
UFS = Unit cost for fixed service in $/billing period
VUC = Volume charge for treatment of 1,000 gals. of normal domestic strength wastewater in $/1,000 gals
F = Billable flow in 1,000 gals.
(E) User charges for users contributing wastes greater than normal domestic strength.
(1) Calculating billable flows and loadings.
(a) The billable amount of flow will be calculated from the volume of metered water usage, or at the discretion of the city, from the measurement of effluent flow at user's point of discharge. Measurements shall be according to a regular program prescribed by the city.
(b) The billable amounts of BOD and TSS will be calculated by the measurement of these wastes according to a program prescribed by the city in keeping with the latest edition of Standard Methods for the Examination of Water and Wastewater and in accordance with other provisions of this chapter.
(2) Calculating user charges.
UC(GNDS) = UFS + (VUC x F) + (UBOD x QBOD) + (UTSS x QTSS)
Where: UC(GNDS) = User charge for treatment of wastewater that is greater than normal domestic strength
UFS = Unit cost for fixed service in $/billing period
VUC = Unit cost for treatment of flow in $/1,000 gals.
F = Billable flow in 1,000 gals.
UBOD = Unit cost for treatment of BOD in $/lb.
QBOD = Quantity of BOD in excess of 228 mg/l in lbs.
UTSS = Unit cost for treatment of TSS in $/lb.
QTSS = Quantity of TSS in excess of 204 mg/l in lbs.
QBOD is calculated as follows:
QBOD = F x 0.00834 x (CBOD -228)
Where: CBOD = Concentration of BOD in mg/l.
QTSS is calculated as follows:
QTSS = F x 0.00834 x (CTSS - 204)
Where: CTSS = Concentration of TSS in mg/l.
(F) Requirements of city. The city may, at its discretion, require nonresidential users to install wastewater flow meters or such additional water meters as may be necessary to determine wastewater volume. The city may require residential connections to install water meters for the purpose of determining wastewater volume. When so required, such meters shall be of a type approved by the city equipped with remote registering recorders and located at an accessible site on the owner's property.
(G) Sewer service charge for recovery of local construction costs. Local construction costs for the wastewater treatment works will be recovered from users in proportion to their contributions of wastewater flow and loadings or the plant capacity allocated to each user, whichever is greater, into the treatment works as follows. Unit costs for debt service of capital expenditures attributable to fixed service, flow, BOD, and TSS shall be calculated according to the Sewer Service Charge System. For purposes of determining debt service charges, the following definitions shall apply:
DFS = Unit cost for debt service of capital expenditures attributable to fixed service in $/billing period
VDC = Wastewater volume charge for debt service in $/1,000 gals.
DF = Unit cost for debt service of capital expenditures attributable to flow in $/1,000 gals.
DBOD = Unit cost for debt service of capital expenditures attributable to BOD in $/lb.
DTSS = Unit cost for debt service of capital expenditures attributable to TSS in $/lb.
(1) Calculating billable flows and loadings. The calculation of flows and loadings for the debt service charge shall be the same as described in this chapter.
(2) Calculating debt service charges.
(a) For normal domestic strength users:
DC(NDS) = DFS + (VDC x F)
(b) For users contributing wastes greater than normal domestic strength:
DC(GNDS) = DFS + (VDC x F) + (DBOD x QBOD) + (DTSS x QTSS)
Where: DC(GNDS) = Debt service charge to normal domestic strength users
DC(GNDS) = Debt service charge to users contributing wastewater that is greater than normal domestic strength
DFS = Unit cost for fixed service in $/billing period attributable to flow in $1,000 gals.
VDC = Volume charge for treatment of 1,000 gals. of normal domestic strength wastewater, in $1/1,000 gals.
F = Billable flow in 1,000 gals.
DBOD = Unit cost for debt service of capital expenditures attributable to BOD in $/lb.
QBOD = Quantity of BOD in excess of 228 mg/l, in lbs.
DTSS = Unit cost for debt service of capital expenditures attributable to TSS, in $/lb.
QTSS = Quantity of TSS in excess of 204 mg/l, in lbs.
QBOD is calculated as follows:
QBOD = F x 0.00834 x (CBOD - 228)
Where: CBOD = Concentration of BOD in mg/l
QTSS is calculated as follows:
QTSS = F x 0.00834 x (CTSS - 204)
Where: QTSS = Concentration of TSS in mg/l.
(H) Total sewer service chart. The total sewer service charge per billing period shall be calculated as follows:
SSC = UC + DC
Where: SSC = Sewer Service Charge
UC = User Charge
DC = Debt Service Charge
(I) Charges and fees. The Council shall adopt by resolution charges and fees which may include:
(1) Fees for monitoring, inspection, and surveillance procedures;
(2) Fees for permit applications;
(3) Appeal fees; and
(4) Other fees as may be deemed necessary to carry out the requirements contained herein.
(Prior Code, § 403.03) (Am. Ord. 2010-4-1, passed 4-13-2010)