There shall be a surcharge per pound of biochemical oxygen demand, the amount of which is on file in the City Clerk’s office, applied to all industrial waste with a biochemical oxygen demand in excess of 300 parts per million. The strength of waste, biochemical oxygen demand, shall be determined from samples taken on the customer’s property at any period of time and of such duration and in such manner as the city may prescribe.
(1989 Code, § 16-234)