(a) Sewer Surcharge. A sewer surcharge shall be fixed by the City and levied for any person, firm or corporation whose premises are served by a sanitary sewer connection and discharges wastes other than normal sewage into the sewerage system. Surcharges shall be based on the applicable constituents of the wastewater as follows:
(1) Total suspended solids; and/or
(2) C.B.O.D., five days at 20 degrees Centigrade; and/or
(3) C.O.D.; and/or
(4) Phosphorus; and/or
(5) Oil and grease.
(b) Surcharge Formula. Whenever the wastes are ruled acceptable to wastewater treatment and the wastewater contains suspended solids, C.B.O.D., and/or C.O.D., and/or phosphorus and/or oil and grease in excess of normal sewage, the excess shall be subjected to a surcharge derived in accordance with the following formulas:
SC = | [(SS-225) x F x 8.34 x CS] + [(CBOD-185) x F x 8.34 x CB] = F x 8.34 x [(SS-225) CS + (CBOD-185) x CB] |
SC = | Surcharge based on average daily flow. |
SS = | Total suspended solids in wastes as discharged in mg/l. |
225 = | Suspended solids concentrations in normal sewage in mg/l. |
F = | Flow in millions of gallons per day of wastes as discharged. |
CS = | Cost to treat one pound of suspended solids in cents per pound. |
Total operating cost attributable to total pounds of suspended solids/total pounds of suspended solids removed. | |
CBOD = | Total C.B.O.D. in wastes as discharged in mg/l. |
185 = | C.B.O.D. concentration in normal sewage in mg/l. |
CB = | Cost to treat one pound of C.B.O.D. in cents per pound. |
Total operating cost attributable to C.B.O.D./total pounds of C.B.O.D. removed. | |
or | |
SC = | [(SS-225) x F x 8.34 x CS] + [(COD-250) x F x 8.34 x CC] = F x 8.34 x [(SS-225) x CS + (COD-250) x CC] |
COD = | Total C.O.D. in wastes as discharged in mg/l. |
250 = | C.O.D. concentration in normal sewage in mg/l. |
CC = | Cost to treat one pound of C.O.D. in cents per pound. |
Total operating cost attributable to C.O.D./total pounds of C.O.D. removed. | |
or | |
SC = | (P-8) x F x 8.34 x CP |
P = | Total phosphorus in wastes as discharged in mg/l. |
8 = | Total phosphorus concentration in normal sewage in mg/l. |
CP = | Cost to treat one pound of phosphorus in cents per pound. |
Total operating cost attributable to phosphorus/total pounds of phosphorus removed. | |
or | |
SC = | (OG-80) x F x 8.34 x COG |
OG = | Total oil and grease in wastes as discharged in mg/l. |
80 = | Total oil and grease concentration in normal sewage in mg/l. |
COG = | Cost to remove one pound of oil and grease in cents per pound. |
Total operating cost attributable to oil and grease/total pounds of oil and grease removed. | |
(2) Use of C.B.O.D. and C.O.D. analyses. Whenever a waste cannot be analyzed by a C.B.O.D. test, the C.O.D. result shall prevail in calculating a surcharge. Whenever both testing methods are possible, the POTW shall determine which analysis shall apply in computing the surcharge based on which will provide the higher surcharge.
(3) Annual review of strength surcharge. On or before March 1 of each year, the strength surcharge for the POTW for the previous year shall be reviewed. The cost to treat the C.B.O.D., C.O.D., oil and grease, suspended solids and phosphorus shall be based on the total operating cost of the sewerage works. Increases or decreases in the cost of treating and disposing of excess amounts of C.B.O.D., C.O.D., oil and grease, suspended solids and phosphorus shall be reflected on a proportionate basis in the strength surcharge on the basis of cost per pound.
(Ord. 1991-118. Passed 8-6-91.)
(c) With the prior approval of Council, the Director of Public Service may relieve the owner of a building within the Historic Preservation District’s “Downtown Area” of the responsibility of providing a “sampling manhole” as provided in Section 915.07. If this responsibility is relieved, a sewer surcharge may be assessed by the Director. The surcharge will be comparable to surcharges calculated from sample concentrations of users engaged in similar business activities in the City. The Historic Preservation District’s “Downtown Area” is considered the area north of Spaulding, east of Clark, and south of Mentor Avenue and Vine Street.
(Ord. 1994-139. Passed 8-9-94.)
(Ord. 1994-139. Passed 8-9-94.)