The borough shall recover from all industrial users, as defined in the most current issue of the North American Industry Classification System, who discharge waste for treatment into the borough sanitary sewer system that portion of the amount of all grants for the construction of the treatment facilities awarded by the U.S. Environmental Protection Agency that is allocable to the treatment of wastes from such users. The contribution required to be paid by each industrial user shall be determined and assessed by the assembly annually in the month of September and the first assessment shall be made within four months of the completion of the improvements and additions to the sanitary sewer system commenced in 1974, a portion of the cost of which was from a grant by the Environmental Protection Agency. Such assessments shall be made for 30 consecutive years which is referred to herein as the “recovery period.” The assessments shall be made in such amount each year against each industrial user as is necessary for each to pay the user’s allocable share of one-thirtieth of such grants. The determination of each industrial user’s share shall be based on all factors which significantly influence the cost of the treatment works, including strength, volume, and flow characteristics. The system for industrial cost recovery and all assessments shall be made, implemented, and maintained in accordance with the requirements, guidelines, and regulations of the Environmental Protection Agency.