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... <br />~. .. .~. A <br />• <br />.~ ,.~ :..,. ~ ... -. ,,. ,--,.. r , ,: <br /> <br />The 0.085 and 0.056 multiplier in the La Porte formula is probably <br />an estimate of these costs fora given set of "typical" conditions. <br />Whatever the original source, the 0.085 and 0.056 multiplier also sho~rs <br />up in ordiances enacted by other municipalities. It is interesting to <br />note that these communities have also amended their ordinances. Further <br />revie~.r of these ordinances also show an inconsistency in units which for <br />the sake of simplicity will not be discussed here. <br />Recommendation <br />The Public Works Department has furnished a projected cost/1000 gal <br />of treating domestic se~;rage. The estimate does not include the separation <br />of costs for BOD and TSS removal. Also, the City has no cost history nor <br />any practical means for separating these costs. Therefore, it is recom- <br />mended that the City adopt a simple ratio-type surcharge formula. A <br />suggested formula and the resulting cost/1000 gal follotiv. <br />Assumptions: <br />Domestic Se~,vage BOD < 250 h1g/1 ~, <br />Domestic Se~rage TSS < 300 Mg/1 <br />Suggested Formula: <br />IS <br />x <br />y <br />Op <br />Vol <br />IS <br />x + y <br />250 300 ) OP X Vol. <br />6005 in h1g/1 (x > 250 Mg/1) <br />TSS in Mg/1 (y > 300 Mg/1) <br />Operations (0 & M) cost/1000 gals. <br />Volume in thousands of gals. <br />Industrial Surcharge Rate <br />Example <br />- Using the projected 0 & M costs supplied by Public Works and <br />the estimated strength of se~rage for Atlanta Truck Wash's Operations <br />IS = (2~0 + ~ ) 0.38/1000 gal = .76/1000 gal <br />0 <br />2 <br />~ . <br />