A. User Classes: Users shall be identified as belonging to one of the following user classes: 1) residential; 2) nonresidential; or, 3) industrial. Allocation of users to user classes shall be based on the substantive intent of the definitions of these classes contained herein.
B. Operation, Maintenance And Repair Costs Established: Each 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 and TSS being the rate established for concentrations of two hundred twenty five milligrams per liter (225 mg/L) BOD and two hundred fifty milligrams per liter (250 mg/L) TSS (i.e., normal domestic strength wastewater). Those industrial users discharging segregated normal domestic strength wastewater only, can be classified as nonresidential users for the purpose of rate determination.
C. Billable Wastewater Volume Calculated: The charges assessed residential users and those users of other classes discharging normal domestic strength wastewater shall be established proportionately according to billable wastewater volume. Billable wastewater volume shall be calculated as follows:
1. Residential Users: Billable wastewater volume for residential users shall be calculated on the basis of metered water usage as averaged between the months of December, January and February. The City may require residential users to install water meters for the purpose of determining billable wastewater volume.
2. Nonresidential Users And Industrial Users: The billable wastewater volume of nonresidential users will be determined on one hundred percent (100%) of the metered water usage as recorded monthly throughout the year or calculated on the basis of wastewater flow meters. The City may, at its discretion, require nonresidential users to install such additional water meters or wastewater flow meters as may be necessary to determine billable wastewater volume.
3. Multiple User Classes: Where one water meter serves different user classes, the City shall determine which appropriate user class of billings shall be used.
D. Determination Of User Charges: User charges for normal domestic users shall be determined as follows:
1. Calculation Of Unit Cost For Treatment Of Normal Domestic Strength Wastewater:
Uomr | = | Comr |
Tbwv |
Where: | |||
Uomr | = | Unit cost for operation, maintenance and replacement in $/100 cubic feet | |
Comr | = | Total annual OM&R costs | |
Tbwv | = | Total annual billable wastewater volume in 100 cubic feet | |
2. Calculation Of User Charge:
Uc | = | Uomr x bwv |
Where: | |||
Uc | = | User charge | |
Uomr | = | Unit cost for operation, maintenance and replacement in $/100 cubic feet | |
bwv | = | Billable wastewater volume of a particular user in 100 cubic feet | |
E. Recovery Of Local Construction Costs: Construction costs of the facility will be recovered through a debt service charge calculated using usage and connection charges as follows:
1. Calculation Of Debt Service Unit Cost For Wastewater Volume:
Uds | = | Cds |
Tbwv |
Where: | |||
Uds | = | Unit cost for debt service in $/100 cubic feet | |
Cds
1 | = | Cost of annual debt service assigned for wastewater volume | |
Tbwv | = | Total annual billable wastewater volume in 100 cubic feet | |
Note:
1. City may reduce the cost of annual debt service through the use of other City funds at its discretion.
2. Calculation Of Debt Service Billable Connection Cost:
U
D | = | CDC |
TC |
Where: | |||
U
D | = | Unit billable connection cost for debt service | |
CDC1 | = | Costs of annual debt service assigned for connections | |
Tc | = | Total number of billable connections | |
Note:
1. City may reduce the cost of annual debt service through the use of other City funds at its discretion.
3. Calculation Of Debt Service Charge:
Dc | = | Uds x bwv = UD x U |
Where: | |||
Dc | = | Debt service charge | |
Uds | = | Unit cost for debt service in $/100 cubic feet | |
bwv | = | Billable wastewater volume of a particular user in 100 cubic feet | |
U | |||
D
=
Unit billable connection cost
U
=
Number of billable connections for a particular user
F. Determination Of Sewer Service Charges: The charge for a particular connection shall be determined as follows:
SSC | = | Uc + Dc |
Where: | |||
SSC | = | Sewer service charge | |
Uc | = | User charge | |
Dc | = | Debt service charge | |
G. Additional Assessment Allowed: The sewer service charges established in this chapter shall not prevent the assessment of additional charges to users who discharge wastes with concentrations greater than normal domestic strength or wastes of unusual character, or contractual agreements with such users, as long as the following conditions are met:
1. The user pays operation, maintenance, and replacement costs in proportion to the user's proportionate contribution of wastewater flows and loadings to the treatment plant, and no user is charged at a rate less than that of "normal domestic strength wastewater".
2. The measurements of such wastes are conducted according to the latest edition of "Standard Methods for the Examination of Water and Wastewater" in a manner acceptable to the City.
H. Greater Than Normal Domestic Strength/Unusual Character: A study of unit costs of collection and treatment processes attributable to flow, BOD, TSS and other significant loadings may be developed for determining the proportionate allocation of costs to flows and loadings for users discharging wastes of greater than normal domestic strength or wastes of unusual character. (1988 Code § 3.41)