(A) In order that the rates and charges may be justly and equitably adjusted to the service rendered, the town shall impose, in addition to the charge based upon volume, a surcharge based upon the strength and character of the sewage and waste which it is required to treat and dispose of. The town shall have the right to measure and determine, or cause to be measured and determined, the strength and content of all sewage and waste discharged either directly or indirectly into the town’s sanitary sewage system in such manner and by such methods as may be deemed practical in the light of the conditions and attending circumstances in order to determine the proper charge. Any and all commercial and industrial installations having an effluent discharge into the town’s sewers with an average BOD (biological oxygen demand) exceeding 200 parts per million concentration and/or an average daily suspended solids exceeding 250 parts per million concentration shall be deemed to be discharging sewage of such strength as to require a surcharge for the treatment and disposal thereof. The town is authorized to prohibit the dumping of waste into the town’s sewage system, which, in the town’s discretion are deemed harmful to the operation of the sewage treatment works of said town and is further authorized to require methods of pretreatment of said wastes to reduce the harmful characteristics of the waste prior to discharge thereof into the town’s system.
(B) (1) The surcharge to be imposed by the town for the treatment of such waste shall be based upon the following formula:
Surcharge = (B
O
(BOD
5
- B
a
+ S
O
(SS - S
a
) x (8.34 x V))
|
(2) For the purposes of the foregoing formula, the following definitions shall apply:
(a) B
O
: Average unit cost of treatment, chargeable to BOD, dollars per pound;
(b) BOD
5
: the concentration of BOD
5
in the wastewater from a specific user, parts per million;
(c) B
a
: maximum concentration of BOD
5
in parts per million which can be discharged into the town’s collection system without a surcharge - 200 parts per million;
(d) S
O
: average unit cost of treatment (including sludge treatment) chargeable to suspend solids, dollars per pound;
(e) SS: the concentration of suspended solids in the wastewater from a specific user;
(f) S
a
: maximum concentration of suspended solids in parts per million which can be discharged into the town’s collection system without a surcharge equals 250 parts per million; and
(g) V: volume in thousand gallons.
(3) The town shall, for the purpose of computing said surcharge, periodically determine the average cost of treatment chargeable to BOD in terms of dollars per pound (B
O
) and the average unit cost of treatment including sludge treatment chargeable to suspended solids in terms of dollars per pound (SO). At this time, the average cost of treatment of BOD has been determined to be $1.30 per pound and suspended solids, $1.12 per pound.
(4) The surcharge herein imposed shall be reviewed annually after the effective date of this subchapter and the required adjustments made to maintain the equity of charges to various classes of users.
(5) A flat rate of $30 per 500 gallons will be charged to septic tank waste delivered to the wastewater treatment plant for treatment and disposal.
(Prior Code, § 9-27) (Ord. 1984-4, passed 12-27-1984)