(1) Any user which cannot be classified by virtue of the volume and/or strength of his wastewater in any of the above user classes shall be considered a special user. If the strength of such wastes is not significantly different from that of normal household wastes, such user shall be placed in the open class and shall be assigned the appropriate wastewater volume. If the wastewater strength is significantly different from that of normal household waste, a special charge based on both volume and strength shall be assigned to that user by the city of Electric City.

(2) Each special user shall be evaluated separately based on the average flow, BODs, and suspended solids characteristics of their wastewater contribution. The flow, BODs, and suspended solids of the special user’s wastewater shall be determined from estimates or measurements and tests conducted by the user as required by the city.

(3) The city will verify the submitted data. The city shall have the right to gain access to the waste stream for taking samples. The user shall provide for the city an adequate sampling access to the waste stream. The user shall pay the city for all expenses incurred in verifying the submitted data.

(4) The special user charge shall be based on a calculated equivalent residential unit for flow, plus a surcharge for excessive strength, if any. The special user’s monthly charge shall be computed by use of the following equation:

“f” represents the special user’s average flow in gallons per day (not less than 250 gallons per day).

“250” represents the average flow of one equivalent residential unit in gallons per day.

“b” represents the average five-day BOD of the user’s wastewater, expressed in mg/l. “b” must be greater than 250 mg/l.

“B” represents the designated limit of five-day BOD of a user’s wastewater above which the user shall be assessed a surcharge cost. The designated limit for five-day BOD shall be 250 mg/l.

“s” represents the average suspended solids of the user’s wastewater, expressed in mg/l. “s” must be greater than 250 mg/l.

“S” represents the designated limit of suspended solids of a user’s wastewater above which the user shall be assessed a surcharge cost. The designated limit for suspended solids shall be 250 mg/l.

“C” represents the constant cost factor per ERU as specified in ECMC 13.20.030.

“SUMC” represents the special user’s monthly charge.

Example: A user has 400 gallons average flow (f), 400 mg/l five-day BOD (b), 550 mg/l average suspended solids (s) and the constant cost factor is $35.00 (C). The formula would be as follows: