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Administrative Draft Environmental Impact Report Gill Medical Center Project be conducted). Thus, the proposed Project is considered slightly superior to Alternative 4 from a hydrology and water quality perspective. 6.3.10 Tribal Cultural Resources 6.3.10.1 Alternative 1: No Project Alternative According to the draft EIR, no Tribal Cultural Resources (TCRs) were identified within or immediately adjacent to the Project site, however ground disturbing activities could result in the unanticipated discovery of TCRs and prehistoric archaeological sites which may be considered TCRs. The draft EIR finds that with implementation of Mitigation Measures 4.20-1a, Project impacts to unknown tribal cultural resources would be less than significant with mitigation incorporated. Under the No Project Alternative, none of the proposed Project construction that require the above mitigation would occur. Therefore Alternative 1 is superior to the proposed Project for the issue of potential impacts to tribal cultural resources. 6.3.10.2 Alternative 2: Reduced Project— Phase 1 Hospital Only The proposed Phase 1 development area comprises 12.5 acres of the 42.4-acre Project site. This equates to an approximately 71 percent decrease in land development compared to the proposed Project with a corresponding reduction in potential impacts to unknown tribal cultural resources. Therefore Alternative 2 is moderately superior to the proposed Project for the issue of potential impacts to tribal cultural resources. 6.3.10.3 Alternative 3: Connect to Public Utilities - Water, Wastewater and Storm Water Under this alternative, the onsite areas reserved for water, wastewater and storm water utility construction would no longer be required and the Project development footprint could be reduced accordingly, benefiting potential impacts to unknown tribal cultural resources. As shown on Figure 6-2, all pipeline extensions required to connect the Project site with the nearest available water, wastewater and storm water utilities would occur within existing road right-of-way. Because trenching for pipeline extension could extend below previous grading conducted for road base construction, implementation of Alternative 3 would result in a moderate increase in potential impacts to tribal cultural resources. While implementation of Tribal Cultural Resources Mitigation Measures 4.20-1 a could be applied during offsite utility construction, due to the length (and potentially depth for wastewater pipelines) of required trenching, a slight increase in potential for impacts to buried tribal resources can be expected. Therefore, Alternative 3 would result in a slight increase in potential impacts to tribal cultural resources and the proposed Project and is considered superior for this issue. Alternatives 6-20 October 2021