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11/21.7 <br />M /NNESO TA A SSC C /AT I C N Of <br />COMMERCE AND /NDOSTRY' <br />March 23, 1976 <br />Mr. Joseph D. Strauss <br />Chairman <br />Metropolitan Waste Control Commission <br />350 Metro Square Building <br />Saint Paul, Minnesota 55101 <br />Dear Mr. Strauss: <br />In accordance with the request of the Metropolitan Waste Control <br />Commission at your March 16, 1976, board meeting, we are attaching <br />hereto suggested alternate pages (7a -14a) for pages 7 -14 in the <br />proposed STRENGTH CHARGE SYSTEM prepared for the MWCC. These alternate <br />pages have been prepared by the Industrial Advisory Committee established <br />in 1973 to assist the MWCC in developing a strength charge system for the <br />Twin Cities area. <br />The report prepared for the MWCC states that 40 per cent of the operation <br />and maintenance costs are due to liquid handling activities and 60 per cent <br />are due to strength related treatment activities. The concept used in <br />arriving at these percentages is generally valid and while anyone might <br />haggle over the exact figures, we find them acceptable. However, we do <br />dispute the rationale of imposing upon industrial users all of the strength <br />related costs. The surcharge should instead be based only on those treat- <br />ment costs which vary proportionately to strength loading. This proportional <br />concept, we believe, is justified by the fact that the fixed costs of <br />strength related treatment facilities would remain even if the system <br />accepted no high strength wastes. For example, while the cost of heating <br />and lighting the filtration and incineration buildings is properly <br />identified as being strength related, this cost is not a function of <br />excessive strength and should not be included in the surcharge calculation. <br />Only those costs which vary proportionately with strength should be included. <br />Examples of strength related costs, in addition to heating and lighting, <br />are operating wages, administrative expense and vehicle expense. Examples <br />of strength proportional costs are contract sludge removal service and <br />treatment chemicals. <br />HANOVER BUILDING • 480 CEDAR STREET • SAINT PAUL, MINNESOTA 55707 • PHONE E72-227 -9597 <br />87 <br />