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Item 4 - PH on MWMC Reg. SDCs
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Item 4 - PH on MWMC Reg. SDCs
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6/9/2010 1:10:03 PM
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6/10/2004 3:21:26 PM
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City Council
City_Council_Document_Type
Agenda Item Summary
CMO_Meeting_Date
6/14/2004
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SYSTEM DEVELOPMENT CHARGE METHODOLOGY <br /> <br />BMF. The majority of the infrastructure associated with this "General" component was <br />constructed in the 1980s and early 1990s. <br /> <br />The current loading or current required capacity is presented as annual average dry tons of <br />digested biosolids. <br /> <br />Current biosolids loading = 4,962 x 1.183 = 5,869 tons per year <br /> <br /> Where: <br /> <br /> - 4,962 dry tons per year (actual 2002 value) <br /> <br /> - 1.183 factor to convert actual value to a value that can be directly compared to <br /> the projected 2025 capacity value when a ~reater biosolids load will be generated <br /> by changes in the treatment process, and is calculated as follows: <br /> <br /> = {(60 x 1.23) + (40 x 1.11)}/100= 1.183 <br /> <br /> o '~fhere: <br /> 60 is the weighting given to BOlD for biosolids produc~on <br /> 1.23 is the BOD ppcd raQo (selected/actual) calculated as follows: <br /> - = 0.185/0.15 = 1.23 <br /> Where: <br /> <br /> 0.185 is the selected annual average BOD ppcd for proiected <br /> influent BOD values <br /> <br /> - 0.15 is the actual BOlD ppcd (annual average over 12-year <br /> period) <br /> <br /> - 40 is the weighffng given to TSS for biosolids producQon <br /> <br /> - 1.11 is the TSS ppcd raQo (selected/actual) calculated as follows: <br /> = 0.233/0.21 = 1.11 <br /> Where: <br /> <br /> 0.233 is the selected annual average TSS ppcd for projected <br /> influent TSS values (average of dry (0.205) and wet (0.26) <br /> seasonal values) <br /> <br /> 0.21 is the actual TSS ppcd (annua] average over 12-year <br /> period) <br /> <br />Some existing biosolids facilities in the "general" subcomponent have more than 5,869 dry <br />tons per year of processing capacity wh~le other existing facilities have less. However, in <br />aggregate there is no available capacity and the existing capacity is assumed to be 5,869 dry <br />tons per year as well. <br /> <br /> The proiected 2025 biosolids is 8,600 dry tons per year on an average annual basis. This <br /> value is esQmated based on a computer model of the WPCF that predicts bioso]ids <br /> <br /> $EA31003271388(DG). DOC/0410400~4 <br /> <br /> <br />
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