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Mountain House Specific Plan III ........................................................................................................................................................................... The main water transmission pipelines shall be provided as indicated by the Master Plan. Specific Plan III — shall include an analysis of the water treatment and transmission system to reaffirm the amount of facilities that will be needed, including storage, to adequately serve the Plan area. _.. 12.8.2 Specific Plan III Description _ Water Distribution: The size and location of the major water distribution mains are identified in the August 2003 West Yost&Associates report,and reproduced here as Figure 12.2.The majority of the _ Specific Plan III area lies within Zone II,with the area north of Grant Line Road being within Zone I. It will be necessary to extend both existing Zone I and Zone If mains located at Mascot Boulevard south to the Specific Plan III area. Extension of the water main system requires the formation of closed"loops"to provide pressure equalization and maintain water quality. It will be necessary to confirm the extent of water main construction required for each phase of development through system modeling and — monitoring of actual pressures. 12.8.3 Implementation Measures a. All water distribution improvements shall be designed and constructed in conformance with the _ current Water Master Plan, Specific Plan III and adopted MHCSD Development Standards. A supplemental analysis shall be performed of the distribution system to verify that suitable pressure will be provided as needed to adequately serve the proposed development area. b. In conformance with the MHCSD Development Standards,to minimize the loading of heavy metal — deposits in the MHCSD sewer treatment system,to the extent possible the MHCSD shall require that all water systems throughout the community, including all habitable structures, shall exclusively prohibit the use of metallic piping for all potable water conveyance and distribution systems on public and private properties and within structures. Exceptions can only be granted as determined by the MHCSD. — c. All implementing projects shall comply with the applicable provisions of the MHCSD Potable Water Master Plan. — d. All implementing projects shall comply with the applicable provisions of the MHCSD Development Standards. _ 12-14 Draft 03/14/05 ...........................................................................................................................................................................