§ 53.89. Surcharge costs

(A) Each person discharging wastewater into the sanitary district sewers shall be subject to a surcharge in addition to the regular sewage service charge based on the biochemical oxygen demand (BOD) and the suspended solids (SS) content of the wastes, if the wastes have a concentration higher than 250 mg/l of BOD and/or 250 mg/l of SS.

(1) Biochemical oxygen demand—250 mg/l.

(2) Suspended solids—250 mg/l.

(B) Sampling and testing for surcharges or use charges. The discharged wastewater will be sampled during each sewage billing period for minimum of a one-day period (24 continuous hours) by means of a composite sample. An extended sampling period of up to one week (7 continuous days) or reduction may be requested to enable the gathering of a sample representative of a company's wastewater. The extension or reduction of the sampling period beyond the initial one-day sampling period may be requested by either the sewer user involved or the bureau. If an extended sampling period is requested, the parameter values used to calculate the surcharge will be the arithmetical average of the individual values. In the event a company or industry has multiple discharges of wastewater, each discharge shall be sampled according to quality. The volume of each discharge shall be determined by actual measurement or by means of process usage. If significant process changes are made to affect quality of any discharge, resampling may be requested by either the sewer user involved or the bureau.

(C) The wastewater sample shall be measured for the following parameters: Biochemical oxygen demand (BOD), and suspended matter or solid (SS). These tests shall be made in accordance with the latest edition of Standard Methods for the Examination of Water or by an approved EPA method.

(D) Computation of surcharge. The excess pounds of BOD and of suspended solids will each be computed by multiplying the sewage billing volume, measured in units of 100 cubic feet, for the current sewage billing period by the factor 0.006238, and then multiplying the differences between the concentration measured in milligrams per liter of the BOD and of the suspended solids, respectively, in the customer's wastewater and the allowed concentrations set out above, resulting in the pounds of each constituent. The surcharge of each constituent will then be determined by multiplying the excess pounds of each constituent by the appropriate rate of surcharge.

(Ord. No. 7-95, § 15, 12-11-95)