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Sewer Use Rules and Regulations - September 2003

Article X - Authority Surcharges

Section 10.01: Surcharges

1.  Although the sewage treatment works will be capable of treating certain industrial wastes and incompatible pollutants as heretofore defined in Article I, the actual treatment of such wastes may increase the cost of operating and maintaining the public sanitary sewage system. Therefore, there will be imposed upon each person discharging such industrial waste into the public sanitary sewage system a surcharge, or surcharges, which are intended to cover such additional cost. Such surcharges shall be in addition to the regular sewage collection, transportation, and treatment charges set forth in the Sewage Disposal Rate Resolution of the Authority, and shall be payable as therein provided.

2.  The strength of any industrial waste, the discharge of which is to be subject to surcharge, shall be determined monthly, or more frequently as the Authority shall determine, from samples taken either at the manhole or metering chamber referred to in these regulations, or at any other sampling point mutually agreed upon by the Authority and the producer of such waste. The frequency and duration of the sampling period shall be such as, in the opinion of the Authority, will permit a reasonably reliable determination of the average composition of such waste, exclusive of storm water runoff. Samples shall be collected or their collection supervised by a representative of the Authority and shall be in proportion to the flow of waste, exclusive of storm water runoff, and composited for analysis in accordance with the latest edition of "Standard Methods for the Examination of Water and Wastewater", cited above. Except as hereinafter provided, the strength of the wastes so found by analysis shall be used for establishing the surcharge or surcharges. However, the Authority may, if it so elects, accept the results of routine sampling and analyses.

3.  In the event any industrial waste is found, by the Authority, to have a BOD in excess of 300 milligrams per liter, the producer of said waste shall be surcharged an amount equal to the product of the actual volume of wastes in thousand gallons per billing period, exclusive of storm water runoff, discharged to the public sanitary sewage system and the "BOD surcharge rate", The BOD surcharge rate shall be determined by the following formula:

Rc = 0.00834 * P *(C-300)  Where Rc is the BOD surcharge rate in cents per 1,000 gallons of waste discharged.

P = the average annual fixed, operating and maintenance cost of secondary treatment processes per pound of BOD received at the treatment works.

C = the average BOD of the industrial waste expressed in milligrams per liter as determined in accordance with Section 10.02 of this article.

The figure 300 appearing in the above formula corresponds to the maximum BOD permissible without surcharge. The figure 0.00834 is the factor to convert milligrams per liter to pounds per 1,000 gallons. No discount will be permitted for sewage or industrial wastes having a BOD less than 300 milligrams per liter.

4.  In the event any industrial waste is found, by the Authority, to have an average suspended solids concentration in excess of 350 milligrams per liter, the producer of such waste shall be surcharged an amount equal to the product of the actual volume of wastes in thousand gallons per billing period, exclusive of storm runoff, discharged to the public sanitary sewage system and the "suspended solids surcharge rate". The "suspended solids surcharge rate" shall be determined by the following formula:

Rs = 0.00834 * B *(S-300)  Where Rs is the suspended solids surcharge rate in cents per 1,000 gallons of waste discharged.

B = the average annual fixed, operating and maintenance cost of the sludge digestion, sludge drying and sludge disposal operations per pound of suspended solids received at the treatment works.

S = the average suspended solids concentration of the abnormal , industrial waste expressed in milligrams per liter as determined in accordance with section 10.02 of this article.

The figure 350 appearing in the above formula corresponds to the maximum suspended solids concentration permissible without surcharge. The figure 0.00834 is the factor to convert milligrams per liter to pounds per 1,000 gallons. No discount will be permitted for sewage or industrial wastes having a suspended solids concentration less than 350 milligrams per liter.

5.  The surcharges provided for in this article shall be added to the sewage collection, transportation, and treatment charges imposed by the Authority under the Sewage Disposal Rate Resolution.

 

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