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Notice of Preparation • • <br /> December 27, 2001 <br /> Page 3 <br /> Due to the flat terrain, the collection system would include lift stations similar to those already <br /> used throughout the city. Initially, wastewater would be pumped from two stations, one on <br /> Stewart Tract in the River Islands development and one in the Mossdale Landing development <br /> near Louise Avenue. Ultimately, a portion of the residential flows from the O Street .pump <br /> station would be pumped to WRP#1. These flows are currently pumped to the City of Manteca <br /> Water Quality Control Facility under agreement with the City of Lathrop. At a later date the <br /> residential flows would be replaced by existing industrial flows, which would be diverted from <br /> WRP #1 to Manteca.) The proposed project therefore includes modifications to the O Street <br /> pump station to accommodate directing some flows to WRP #1, although it will not include the <br /> force main from WRP#I to the Manteca facility. All three force mains required for collection <br /> are identified in the approved Master Plan. <br /> Expansion of WRP 11 in Phase IE .vould increase the capacity of the punt by as much as an <br /> additional 2.4 mgd, for a total capacity of 3.6 mgd. This capacity would be provided in multiple <br /> phases, as needed. Together,therefore,the two phases of WRP#1 expansion would add as much <br /> as 3.0 mgd to the existing 0.6-mgd capacity. The Phase 113 expansion would also include <br /> providing extended aeration for treatment, with the addition of oxidation ditches and clarifier <br /> tanks. Again, alternate treatment processes are being reviewed and may be used if they can <br /> provide the required tertiary quality effluent at a competitive cost. The land identified for this <br /> phase of expansion is adjacent to the existing plant property; partly on land owned by the City of <br /> Lathrop and partly on land presently owned by Crossroads CREA (AEW), the developer of the <br /> Crossroads Commerce Center, and would be acquired for the proposed project. <br /> The 3.0 mgd of additional treated wastewater generated by WRP #1 in the two phases of the <br /> proposed project would be disposed of entirely on land throughout the year, in accordance with <br /> all Central Valley Regional Water Quality Control Board and California Department of Health <br /> Services (DHS) guidelines and standards. (Although the Master Plan EIR evaluated river <br /> discharge as a component of WRP #1 expansion, river discharge is not currently proposed.) <br /> Disinfected tertiary-treated recycled water is the highest class of treated wastewater; it meets <br /> Title 22 requirements for allowable contaminant levels in recycled water and represents <br /> essentially :a pathogen-free water considered suitable by DHS for unrestricted landscape <br /> irrigation and other uses such as golf courses and parks. Ponds would be used to hold treated <br /> wastewater during periods when irrigation demand is low, and the water would then be disposed <br /> of at existing agricultural operations and public landscaped areas. <br /> Some development projects that have requested to be served by the Phase IA/1B expansion <br /> include, as part of their project description, holding ponds and disposal areas of sufficient size to <br /> meet all of their storage and disposal demand. These holding ponds and spray fields will be <br /> analyzed in this EIR. Holding pond and sprayfield locations for the disposal of all effluent added <br /> above existing flows will be identified and evaluated in this EIR. (In instances in which other <br /> EIRs for development projects already evaluate sprayfields and holding ponds,the analyses will <br /> be incorporated by reference.) <br /> 16775 Howland Road-Suite One Lathrop, CA 95330 <br />