S = V x 8.34 [0.011 (BOD – 300) + 0.007 (SS – 300)]
|
Where:
| ||||
S
|
=
|
Surcharge in dollars
| ||
V
|
=
|
millions of gallons of water consumed during billing period
| ||
8.43
|
=
|
pounds per gallon of water
| ||
0.011
|
=
|
unit charge per pound for BOD in dollars
| ||
BOD
|
=
|
BOD strength index in parts per million by weight
| ||
300
|
=
|
normal BOD strength in parts per million by weight
| ||
0.007
|
=
|
unit charge per pound suspended solids in dollars
| ||
S.S.
|
=
|
suspended solids strength index in parts per million by weight
| ||
300
|
=
|
normal suspended solids strength in parts per million by weight
| ||
(There shall be no reduction in surcharge for a discharge with
less than 300 BOD or SS)
|
S (additional) = V x 8.34 1.5 (P – 10)
|
Where:
| ||||
1.5
|
=
|
unit charge per pound of P in dollars
| ||
P
|
=
|
phosphorous as "P" in parts per million by weight
| ||
10
|
=
|
normal "P" strength in parts per million by weight
|