Wu
| |||||
Cu
|
=
|
_____
|
x
|
Ct - Rt
| |
Wt
|
Where:
| ||||
Cu
|
=
|
The building's sewer use charge for the billing
period.
| ||
Wu
|
=
|
The building's metered or estimated water consumption
for the billing period.
| ||
Wt
|
=
|
The water consumption of all buildings connected
to the sewer system in question, as determined from meter readings
and appropriate engineering estimates.
| ||
Ct
|
=
|
The operation and maintenance costs for the
sewer system in question for the billing period.
| ||
Rt
|
=
|
The revenue collected from an industrial surcharge
and any other surcharge for discharging a disproportionate amount
of pollutant or nutrient removal.
|
Cs = [Bc(B-300) + Sc(S-300) + Pc(P-Pn)] Vu
|
Where:
| ||
Cs = The building's surcharge for the year for
excessive concentrations.
| ||
B = The building's concentration of BOD.
| ||
Bc = Operation and maintenance cost for treatment
of a unit of BOD.
| ||
S = The building's concentration of suspended
solids.
| ||
Sc = Operation and maintenance cost for treatment
of a unit of suspended solids.
| ||
P = The building's concentration of any pollutant.
| ||
Pc = Operation and maintenance cost for treatment
of a unit of any pollutant.
| ||
Pn = Base level of concentration of any pollutant.
| ||
Vu = The building's volume of discharge for
the year.
|