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project runoff. Stormwater runoff from industrial areas is required by the MHMP to be treated on-site using Best Management Practices(BMPs)before discharge into the storm drain system. As an interim alternative(until the new water-quality basin is developed for Neighborhood A)to the Central Parkway storm-drain system,runoff from the western portion of the College Park site could be routed to the ` DeAnza system,as shown in Figure 3-12("Potential temporary connection along south side of Grant Line Road").Because of the large upstream watershed that drains to the project site, any temporary routing would include interim detention such that flows would not exceed the capacity of the downstream storm-drain system. L As a potential interim requirement of MHCSD, a small water-quality and/or detention basin may be required as part of the DeAnza storm-drain system in the College Park portion of Neighborhood D. This basin could be ,. required until such time as the existing Water Quality Basin No. 1 is expanded to accommodate project runoff. 3.10.2 WATER Consistent with the MHMP,water for the proposed project would come from the existing Mountain House WTP, which is located along the north side of Byron Road,just east of the future Great Valley Parkway.The approved capacity of the plant is 20 million gallons per day(mgd),which is sufficient to serve the MHMP area at buildout when maximum day demand is expected to be approximately 17.1 mgd(MacKay& Somps 2004).The current design capacity of the plant is approximately 1.7 mgd,which would be fully consumed with development of Neighborhoods E,F, and a portion of G in Specific Plan I.Two expansions of the plant are currently being ` planned,one to 11.9 mgd, and the second to 17.1 mgd.It is anticipated that the improvements to the plant required to serve College Park will be completed in 2006(MacKay& Somps 2004). The project site lies between two pressure zones: Zone 1 is the portion of the MHMP area below elevation 90, and Zone 2 is above elevation 90.The boundary between the two zones is generally Mascot Boulevard,with the College Park site generally located in Zone 2(although a portion of the College Park site north of Grant Line Road is within Zone 1).As shown in Figure 3-13, water mains in Central Parkway and DeAnza Boulevard,to be constructed by Trimark in summer 2004,to just south of Mascot Boulevard would be extended south along these roadways to serve the College Park project site.The College Park area,or Zone 2,is at a higher elevation and would require construction of a booster pump station.There are several options for the location of the booster pump station.The primary location is shown in Figure 3-13.An alternative location is along the east side of DeAnza Boulevard,north of Grant Line Road in the Neighborhood D portion of the College Park project site. Treated potable water is stored at the WTP near Byron Road.Two water tanks are proposed on the SJDCCD portion of the College Park project site,one for Zone 1 and one for Zone 2.These two tanks would be located in the northeast comer of the SJDCCD property, as shown in Figure 3-13. To supplement water from the Mountain House WTP,the project includes a proposal for a nonpotable water system whereby 60 acre-feet per year(afy)of non-potable water would be provided to the College Park site by the BBID for landscape irrigation. This nonpotable water(regular water not treated to drinking water standards) would be provided through an underground pipe system that would run from BBID's Canal 155, located just north of Grant Line Road, southward down the Great Valley Parkway right-of-way,eastward along the south side of Grant Line Road, and then southward down Central Parkway to the proposed community park.A small pump station would be built at the terminus of the canal and the new pipeline to pump the water from the canal into the system and to provide the necessary water pressure. College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 3-39 Project Description