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Mountain House Specific Plan III .......................................................................................................................................................................... 12.6 Water Treatment Plant 12.6.1 Master Plan Summary The Mountain House water treatment plant, located within Neighborhood I,has been implemented according to Master Plan requirements to provide an adequate and safe potable water supply. 12.6.2 Specific Plan III Description r. Water Treatment Plant: The MHCSD presently has an agreement with the Byron Bethany Irrigation District(BBID) for the delivery of raw water from the BBID pumping plant located on the main intake canal to the State's main pumping plant on the California Aqueduct.The raw water is delivered through a 30-inch diameter pipeline to the Water Treatment Plant(WTP)site.The pumping facility and raw water r. pipeline are sized to have an ultimate capacity of 20 million gallons per day; enough to serve the full build out of the Mountain House Community. Hence,there is no expected need to construct an additional ` raw water pipeline.The pumping plant requires the installation of additional pumps as the capacity of the WTP is expanded. The existing WTP (March 2004)has a capacity of 3.0 mgd, and at full build-out will have a capacity of between 17.1 mgd and 20 mgd. The 17.1 mgd is based on the aggressive water conservation assumptions in the Master Plan being met. 20 mgd is the current maximum day estimate by West Yost and Associates for maximum day demand,utilizing current water demand rates. Actual water demands rates may be r higher and a larger WTP could ultimately be required. At the current rate of community development, the plant will need to be expanded soon. The plant capacity will be used up as Neighborhood G begins ` development. To serve the water supply needs of the remainder of Neighborhood G,and the requirements of SP II and Specific Plan IH, the plant will need to go through a major enlargement. One or two more phased expansions will be needed to bring the plant to its planned full build-out capacity of between 17.1 mgd and 20.0 mgd. Monitoring of actual water usage will take place as the community grows and the final capacity of the treatment plant may require adjustment. The MHCSD is engaged in analyzing the current treatment process and to make recommendations for the ` type of treatment process to be constructed in future plant expansions. Design for the plant expansion should begin in 2005,with construction beginning in the fall of 2005.It is expected that early 2007 will complete the plant improvements. Subject to MHCSD approval,package or Draft 03/14/05 12-11 ...........................................................................................................................................................................