It is ordained that the Schedule of Industrial Waste Pollutant Strength Surcharges is hereby adopted and made effective for users of the waste water system of the City of Inkster, Michigan. Said surcharges to be computed as follows:
COMPUTATION OF INDUSTRIAL WASTE POLLUTANT
STRENGTH SURCHARGE
The industrial waste pollutant strength surcharge shall be computed in accordance with the following formula:
SC = 0.0624 V a (BOD-250) + b (TSS-300) + c (P-12)
WHERE:
SC = Pollutant strength surcharge fee in dollars for the billing period.
V = Volume of waste discharged in the billing period in Mcf (1000 cubic feet).
`BOD’ = Five-day biochemical oxygen demand of the waste expressed in milligrams per liter (ppm).
`TSS’ = Total Suspended solids in the waste expressed in milligrams per liter (ppm).
`P’ = Phosphorus in the waste expressed in milligrams per liter (ppm).
a, b, c = Surcharge rates, $/pound for treating BOD, TSS and P respectively.
0.0624 = Factor which converts Mcf to MM lbs
a = $0.082/pound
b = 0.083/pound
c = 1.321/pound
For purposes of surcharge computation, the values of pollutant strengths shall not be less than the allowable values; the allowable values are:
BOD - 250
TSS - 300
P - 12
The total sewerage charge for a particular industry would be the sum of the base flow charge and the surcharge would be calculated from the following formula:
UC = V(R)+SC
WHERE:
UC = Total sewerage charge for the billing period in dollars.
V = Volume of waste discharged in billing period of Mcf
R = Basic flow sewage rate is as established by resolution of the City Council, the City of Inkster.
SC = Surcharge in dollars as computed above.
(Ord. 586, Sec. iv)