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Item 8 - Action MWMC SDC
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Item 8 - Action MWMC SDC
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6/9/2010 12:55:49 PM
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6/24/2004 8:58:20 AM
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City Council
City_Council_Document_Type
Agenda Item Summary
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6/28/2004
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SYSTEM DEVELOPMENT CHARGE METHODOLOGY <br /> <br />reduction efforts outlined in the 2000 WWFMP. Therefore, it is estimated that the I/I <br />reduction efforts will reduce I/I by approximately 17 mgd. <br /> <br />Wet season I/I in 2025 attributed to existing users is determined by subtracting the <br />anticipated reduction in wet season I/I (17 mgd) from the current wet season I/I <br />(220.2 mgd) yielding 203.2 mgd. <br /> <br />Finally, wet season I/! attributed to growth in 2025 is 14.5 mgd and is determined by taking <br />the 2025 total peak flow projection of 277 mgd and subtracting both the 2025 average flow <br />(59.3 mgd) and the 2025 wet season I/I attributed to existing users (203.2 mgd). Therefore, <br />the peak flow in 2025 attributed to growth is 30 mgd (15.5 mgd of average flow plus 14.5 of <br />wet season I/I flow). <br /> <br />TABLE C-2 <br />Projected 2025 Peak Flow Breakdown <br /> <br />Average flow attributed to existing users (includes dry 43.5 mgd <br />season I/I) <br /> <br />Average flow attributed to future users (includes dry 15.5 mgd (59.3 - 43.8) <br />season I/I) <br /> <br />Wet season I/I attributed to existing users 203.2 mgd (220.2 - 17) <br />Wet season I/I attributed to future users 14.5 mgd (277 - 59.3 - 203.2 <br />Total peak flow 277 mgd <br />Total peak flow attributed to growth 30 mgd (15.5 + 14.5) <br /> <br />BOD <br />The methodology for BOD is similar to that of average flow. The existing capacity, although <br />not explicitly stated in the current NPDES permit, is 66,000 lbs/day, which was the value <br />used for the original WPCF design. The current loading~or current required capacity in <br />presented in DSMM terms is 54,800 lbs/day and is determined as follows: <br /> <br /> Current BOD = (0.185 x 217,737 x 1.3) + 2,402 = 54,800 lbs/day (actual calculated value of <br /> 54,756 lbs/day rounded to the nearest hundred pounds). <br /> <br /> Where: <br /> <br /> 0.185 is the selected pounds per capita per day (ppcd) based on dry season <br /> values from 1990 to 2002 <br /> <br /> 217,737 is the population served in 2002 <br /> <br /> 1.3 is the selected peaking to convert average dry season load to DSMM load <br /> (based on 1990 to 2002 data) <br /> <br /> 2,402 is the current industrial BOD load in lbs/day <br /> <br /> The available capacity in terms of BOD is 11,200 lbs/day (66,000 - 54,800). <br /> <br /> SEA31003271388(DG).DOC/041040034 <br /> <br /> <br />
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