§ 18-107  USER CHARGE SCHEDULE.
(A)   As the BOD, suspended solids and other pollutant concentrations discharged shall be approximately equal for all domestic type users, users shall be charged on a volume basis in accordance with the following formula, which is based on the Federal Water Pollution Control Act of 1972, as amended, 40 CFR Part 35.935-13 and 40 CFR Subpart E, Appendix B, Model #1:

 Cu = Cb + (Ct )(Vu) Vt

(B)   (1)   Cu equals a user's charge for sewer service (total O & M) per unit of time.
(2)   Cb equals a user's base minimum charge for certain fixed costs per unit of time.
(3)   Ct equals total operation and maintenance (O&M) costs per unit of time.
(4)   Vt equals total volume contribution from all users per unit of time.
(5)   Vu equals volume contribution from a user per unit of time.
(C)   Example:  It is determined that the total annual fixed costs (debt retirement, administration, billing and the like) for the system is \$61,500 and there are a total of 3,100 sewer customers.  Each user's minimum monthly base charge is determined to be \$61,500 divided by 3,100 users.  That equals \$19.84 divided by 12.  This equals \$1.65 per month.  It is further determined that the total annual variable costs (labor, power, supplies, O&M and the like) for the system is \$140,000 and that the approximate total volume contribution for all users is 350,000,000 gallons per year.  The variable charge (Ct/Vt) is, therefore, determined to be \$140,000 divided by 350,000.  This equals \$.40 per 1,000 gallons.  Based upon this example and the above user charge schedule the monthly charge for a customer using 5,000 gallons of water would be \$1.65, plus \$.40 times five.  This equals \$3.65.
(`90 Code, § 18-49)  (Ord. 2759, passed 1-8-85)