An extra loading surcharge (“ELS”) shall be paid by each industrial user discharging wastes into the City's sanitary sewer system having loadings of suspended solids (“SS”), biochemical oxygen demand material (“BOD”), phosphorus (“P”) and/or oil and grease (“O&G”) in excess of the ordinary household wastes (“OW”) loadings for which the plant was designed, that being OW having concentrations not in excess of 250 mg/l of SS, 185 mg/l of BOD, nine mg/l of P, and fifty mg/l of O&G. The ELS may be established by ordinance, but shall be equal at least to the cost of treatment of all poundage in excess of OW loadings at the per pound treatment costs for SS, BOD, P and/or O&G as determined by the Service Director.
The extent to which such loadings are in excess of the stated OW loadings shall be determined by the Director from the samples taken by or under the direction of the Director and from the samples taken by the respective users for reporting in the self-monitoring reports. In cases where the data collected are insufficient, in the opinion of the Director, or disputed by the user, the Director may order special sampling requirements or order that the effluent of the user shall be metered by a sewer meter approved by the Director and to be installed with such sampling requirements as the Director shall order and approve therewith, all at the expense of the user. The Director's determination of loadings in excess of OW loadings and orders requiring meter installation and sampling shall be final.
Any ELS or ELS adjustment billed pursuant to this section shall be payable within thirty days. If not paid within such time, the permittee shall be considered in default of permit obligations which shall be a ground for revocation or suspension of the permit.
(Ord. 180-1992. Passed 6-29-92.)