There is hereby charged to each lot, parcel of land, building or premises discharging sewage, industrial wastes, water or other liquid, other than normal sewage, either into the Metropolitan Sewerage System, into a stream or in a manner contrary to law, the surcharge established herein in addition to the charge now or hereafter fixed for normal sewage.
The basis of the surcharge shall be determined on either or both of two constituents of the water or wastes:
(a) Total suspended solids and/or
(b) B.O.D. five days at twenty degrees Centigrade and as herein provided.
When either or both the total suspended solids and B.O.D. of a water or waste accepted for admission to the City sewage works exceeds the values of these constituents for normal sewage, the excess concentration in either or both, as the case may be, shall be evaluated volumetrically in terms of normal sewage and be subject to surcharge on the volume derived in accordance with the following formula:
Sv= Sw-2500 x 0.65 x F x 133,690
2500
plus (Bw-2000) x 0.65 x F x 133,690
2000
which reduced to its simplest form is
Sv=F ( (Sw-2500) 35 plus
(Bw-2000) 43).
where Sv is the derived volume of wastes in cubic feet subject to surcharge.
Sw means the pounds per million gallons of suspended solids in the wastes as discharged
2,500 is the pounds per million gallons of suspended solids in the normal sewage.
Bw means the pounds per million gallons of B.O.D. in the wastes as discharged.
2000 is the pounds per million gallons of B.O.D. in normal sewage.
0.65 means the factor allowance for a 65% degree of purification.
(The present B.O.D. requirement for the Cincinnati Pool was established by the Ohio River Valley Water Sanitation Commission.).
F means the flow expressed in million gallons of the wastes as discharged.
133,690 is the factor to convert million gallons to cubic feet.
The equivalent volume of normal sewage as derived from the excess above the normal strength of any water and wastes shall be subject to a surcharge for the volume of equivalent normal sewage as computed from the formula, at a flat rate of three cents ($.03) for each 100 cubic feet, as above computed.
(Ord. 6-53. Passed 5-8-53.)