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Administrative Draft Environmental Impact Report Gill Medical Center Project trenching and pipeline construction would be required to make the required connections with existing utilities. Even without the need for onsite utility construction, due to the length of required pipeline extensions (over four miles combined), Alternative 3 would substantially increase potential construction related erosion and siltation water quality impacts. However, as discussed in draft EIR Section 4.12 Hydrology and Water Quality, the Project, and Alternative 3, would be subject to a construction SWPPP which requires implementation of construction erosion control and water quality best management practices that would ensure protection of water quality during construction consistent with state requirements. In summary, due to the substantial length of required trenching under Alternative 3, a slight increase in potential for construction related siltation and water quality impacts is expected. Therefore, the proposed Project is superior to Alternative 3 for the issue of hydrology and water quality. 6.3.9.4 Alternative 4: Alternative Site Location—Stockton Economic and Education Enterprise Zone (Eight Mile Road at 1-5) Draft EIR findings for the proposed Project related to hydrology and water quality are summarized above in section 6.3.9.1. Under Alternative 4, the Project would be located 2.1 miles west of the proposed Project site within the City of Stockton Economic and Education Enterprise Zone located north of Eight Mile Road and east and west of 1-5 as shown in Figure 6-7. Existing conditions at the Alternative Site location are similar to the Project site; mostly level and currently in agricultural production. The Alternative Site is not located within the current City of Stockton city limit, but is located within the City's Sphere of Influence and General Plan Planning Areas. According to the Envision Stockton 2040 General Plan Update and Utility Master Pan Supplements draft EIR (City of Stockton.June 2018.), sufficient water supply, wastewater treatment and storm water collection and conveyance is available to serve General Plan buildout. However utility demands and related hydrology and water quality impacts due to future development within the Enterprise Zone have not yet been evaluated under CEQA. Therefore it is unknown if the Alternative Site could be adequately served by existing City water, wastewater and storm water utilities, or if these existing utilities would need to be expanded to accommodate future Enterprise Zone development.Alternatively, under Alternative 4 these utilities could be developed onsite similar to the proposed Project. However additional studies would be required to understand if onsite utility development and operation would result in significant hydrology and water quality impacts. As noted for Alternative 3 above, should Alternative 4 be served by City utilities, onsite areas reserved for water, wastewater and storm water utilities would no longer be required and development footprint could be reduced accordingly. As discussed above, this would amount to an approximately 3.7 acre, or 8.7 percent reduction, in site development compared to the proposed Project, with a corresponding reduction in construction and operation related hydrology and water quality impacts. In summary, hydrology and water quality impacts from implementation of Alternative 4 are expected to be similar to that of the proposed Project, although with greater uncertainty(until additional studies can Alternatives 6-19 October 2021