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DUBLIN SAN RAMON SERVICE DISTRICT REGIONAL CONNECTION FEES Appendix B DSRSD Engineers Report ANALYSIS OF CURRENT AND PROJECTED REGIONAL WASTEWATER TREATMENT PLANT FLOWS David A. Requa, District Engineering Engineer April 2010 The purpose of this analysis is to evaluate the wastewater flows required to be treated at the Regional Wastewater Treatment Plant (WWTP) when the General Plans of the three cities served by thc District reach build out. The result of this study provides the basis to update required capital improvement projects to meet the needs of future customers of the District. BACKGROUND The District is a member of the Livermore Amador Valley Water Management Agency (LAVWMA) a Joint Powers Authority (JPA) along with the cities of Pleasanton and Livermore. The JPA owns and operates pump stations and pipelines to transport wastewater effluent from the valley to San Francisco Bay for disposal. In 1997, the JPA was amended to provide for the expansion of the disposal system and to set influent wastewater limits for thc three member entities. Since the JPA amendment, the District has use the influent limit which is 20.7 million gallons per day (mgd) for the District and Pleasanton combined, as the basis of capital improvement planning (CIP) and determination of regional connection fees. During the preparation of a regional connection fee study in 2008, the approach was modified to use the General Plan buildout of the 3 cities served by the District which was estimated to be 17.8 mgd at the time. To support the connection fee study, staff reduced the total cost of the CIP for regional expansion to approximate the cost reduction from 20.7 to 17.9 mgd. However, the CIP document was not revised. In December of 2009, the District Board of Directors reviewed the policy issue of the proper basis for CIP and regional connection fee planning. The Board adopted use of the buildout of the General Plans. A modified CIP document has now been prepared' to reflect the Board policy. EXISTING TREATMENT CAPACITY A major Stage 4 expansion of the WWTP was completed in 2003. As required by the Regional Water Quality Control Board, upon completion of the expansion, the WWTP was stress tested to document the 2 "CIP Process Capacity Review Whitley Burchetl Associates; May 2009. BLACK VEATCH 20 MAY 2010