The standard strengths for biochemical oxygen demand, suspended solids, nitrogen ammonia and oil and grease, as set forth in Section 1048.03, shall be subtracted from the average strengths, as determined in Section 1048.08, to determine the extra strengths of each industrial class user for each strength surcharge billing period. The extra strengths and the volume of sewage charged for the billing period shall then be used to determine the weight in pounds of biochemical oxygen demand, suspended solids, nitrogen ammonia and oil and grease to be charged for strength surcharge. The Director may impose surcharge strength charges on a commercial class if it is determines that the commercial class sewage discharge is in excess of the standard strength sewage.
(Ord. 134-87. Passed 9-3-87; Ord. 162-06. Passed 10-5-06.)