Vernal City, or its engineer, will determine the average total suspended solids (SS) and five (5) day biochemical oxygen demand (BOD) daily loadings for the average residential user or in lieu of such a determination will consider the average residential strength wastes to be two hundred (200) mg/1 BOD and two hundred fifty (250) mg/1 SS. Vernal City, or its engineer, will assess a surcharge rate for all nonresidential users in Vernal City discharging wastes with BOD and SS strengths greater than the average residential user. The surcharge will be sufficient to cover the costs of treating such user's above-normal strength wastes. Such users will pay an additional service charge of thirty (30) cents per one thousand (1,000) gallons of each twenty-five (25) mg/1 over two hundred (200) mg/1 of BOD and twenty-four (24) cents per one thousand (1,000) gallons for each twenty-five (25) mg/1 over two hundred fifty (250) mg/1 SS. (Ord. 80-8 § 3)