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Applying the 40/30/30% breakdown of all eligible operation and maintenance <br />costs for Flow /avg SS /avi COD a: d 116/16% breakdown ob ail eligible openati.on <br />and maintenance coed $an. high 647terj33h - SS /CUD results in the following <br />industrial contribution share of-the treatment works 0 & M costs: <br />Flow: <br />Avg. SS: <br />Kvg. COD: <br />SS: <br />High S.t&eng-th SS: <br />8.70% x 0.40 = 3.48% <br />8.70% x 0.30 = 2.61% <br />V <br />8.7 Ti x 0.30 = 2.61% <br />24:29 % -x- 8 739 - =_ -3:29% <br />24.29% x 0.16 = 3.89% <br />699- 3$:43 % -x- 9:39- =241ha <br />38.43% x 0.16 = 6.15% <br />High Sticeng -th CUD: <br />Total = 22:30% 18.74% as industry share of <br />T.W. 0 & M costs <br />The foregoing computations illustrate that the 21.-36% 15.69% industry revenue <br />contribution based on the proposed strength charge system compares favorably <br />with the 22:39% 18.74 %industry contribution based on the high strength loadings. <br />The user strength charge formula as proposed in this report is thus demonstrated <br />to be equitable and as required in PL92 -500 does "insure a proportional dis- <br />tribution of operation and maintenance costs to each user" based on "such user's <br />contribution to the total wastewater loading of the treatment works." <br />