For those customers which the county has agreed to serve and either the customer or
the utility has determined that the strength of the sewage is greater than three hundred
fifty (350) parts per million (ppm) biochemical oxygen demand (BOD), eight hundred
(800) ppm chemical oxygen demand (COD), three hundred fifty (350) ppm total suspended
solids (TSS) or fifty (50) ppm total nitrogen (TN), then an abnormal strength surcharge
will be applied to the quarterly bill. Biochemical oxygen demand or BOD means the
quantity of oxygen in the biochemical oxidation of the organic matter in the wastewater
under standard laboratory procedures in five (5) days at twenty degrees centigrade
(20 ° C), as expressed in milligrams per liter. Chemical oxygen demand or COD means
the quantity of oxygen in the chemical oxidation of the organic matter in the wastewater.
Total suspended solids or TSS means the quantity of filterable solids in the wastewater.
Total nitrogen means the total of organic nitrogen, ammonia, nitrite and nitrate.
Organic nitrogen is to be determined by the Kjeldahl method. The concentration of
BOD, COD, TSS and TN shall be determined in accordance with procedures set forth in
the Standard Methods for Examination of Water and Wastewater, 18
th
Edition. The surcharge factor is calculated in the following manner:
Concentration of BOD less three hundred fifty (350) ppm divided by three hundred fifty
(350) ppm. Concentration of COD less eight hundred (800) ppm. The BOD and COD ratios
will then be averaged to determine one BOD/COD ratio. Concentrations of TSS less three
hundred fifty (350) ppm divided by three hundred fifty (350) ppm. Concentration of
TN less fifty (50) ppm divided by fifty (50) ppm. The surcharge factor will be the
average of the BOD/COD, TSS and TN ratios. The total bill will be calculated by multiplying
the surcharge factor by the metered wastewater usage time the rate per one thousand
(1,000) gallons plus the base facility charge (BFC).
(Ord. No. 04-4, § 19, 3-2-2004)
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