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DUBLIN SAN RAMON SERVICE DISTRICT <br /> 1 4 (s REGIONAL CONNECTION FEES <br /> The ultimate capacity of the WWTP is established by the buildout of the General Plans of San Ramon <br /> Dublin and Pleasanton" the three cities the District serves. The number of existing DUEs, buildout <br /> DUES, and future DUEs for each city is shown in Table 1. The future DUEs are 20,493. Based upon a <br /> conversion factor of 220 gpd, the future wastewater flow is estimated to be 4.5 mgd. <br /> Table 1— Dwelling Unit Equivalents (DUE) <br /> City Jan 1, 2010 Buildout Future <br /> San Ramon 6,465 6,498 33 <br /> Dublin 23,518 39,176 15,658 <br /> Pleasanton 34,491 39 244 4 753 <br /> TOTAL 64,474 84,918 20,444 <br /> Adding both the potential flow from existing customers and the flow from future customers the <br /> anticipated buildout ADWF is 17.8 mgd (13.3 mgd plus 4.5 mgd). <br /> FUTURE PEAK WET WEATHER FLOW (PWWF) <br /> The second key aspect of WWTP capacity is the PWWF that has to be treated. PWWF is the result of <br /> groundwater (infiltration) and rain water (inflow) entering the collection system. During the later rainy <br /> period of the year when groundwater is highest, the 1/1 component of wastewater is also the highest. <br /> Historical PWWF has exceeded 35 mgd. Based upon collection system storm flow monitoring, the <br /> estimated PWWF that may occur at a 20 -year return frequency and with an ADWF of 11.2 mgd is 40.0 <br /> mgd As a result, a major capital investment in the WWTP is required to utilize the existing 17.0 mgd <br /> ADWF. <br /> The relationship between ADWF and PWWF was shown previously in Figure I. Currently, PWWF is 3.6 <br /> times ADWF. Over time, this ratio will tend to increase with the aging of the collection system. <br /> However, because of higher density development, there will be more DUEs per mile of sewer which will <br /> tend to reduce this ratio. For planning purposes, a ratio of 3.6 will be maintained based upon the <br /> "A General Plan for the Future, San Ramon 2020"; Dyett Bhatia, Urban Regional Planners; March 2002. <br /> "City of Dublin General Plan City of Dublin Community Development Department; January 2010. <br /> City of Pleasanton Planning Department data; February 2010. <br /> BLACK VEATCH 24 MAY 2010 <br />