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Cultural Resources The project site does not contain any cultural resources listed in the NRHP or the CRHR, and although the site (including the off-site infrastructure areas)contains 10 known historic-era cultural resources,none of these are listed or eligible for listing in the CRHR.A portion of the site(Grant Line Village)contains 23 existing .- buildings/structures that may represent historic resources(i.e.,are currently 50+years of age or would be 50+years of age at project buildout[2025])and may contain undiscovered and unrecorded subsurface cultural resources. Both the Traffic/Air Emissions Alternative and the proposed project would disrupt the 815-acre project site,off-site infrastructure locations,and Grant Line Village and thus both would have the potential to result in significant impacts on undiscovered and unrecorded subsurface cultural resources and/or potential historic structures.Because the area to _ be affected would be the same under each scenario,the potential for significant cultural resources impacts would be similar for this alternative and the proposed project.[Similar] Drainage Both the MHMP Buildout Alternative and the proposed project would include development of the 815-acre project site; construction activities within the off-site infrastructure sites; grading of the project site; an increase in impervious surfaces, 100-year runoff,and runoff velocity; and an increase in demand for capacity in the existing and proposed MHCSD storm drain system. The 100-year runoff volume would be expected to be slightly less under this alternative than under the proposed project because more turfed open space would be provided under this alternative(associated with the clustering of residential units on several of the R/MH parcels under this alternative).Both scenarios would result in less-than-significant sedimentation/erosion and flooding/exceedance of storm drain capacity impacts,because of: L � implementation of existing San Joaquin County and MHCSD policies,requirements, and standards applicable to development within the MHMP area with which any development would need to comply and the general consistency of each of these scenarios with the Mountain House Stormwater Master Drainage Plan. —. Both scenarios would also result in a lower demand for capacity in the MHCSD storm drain system than the system has been planned for and designed to accommodate.Therefore, drainage impacts would be similar for this alternative and the proposed project.[Similar] Water Quality Both the Traffic/Air Emissions Reduction Alternative and the proposed project would include mass grading, earth-moving activities,and excavations during construction across the 815-acre project site(with the possible exception of Grant Line Village). Both scenarios would also include construction activities of roughly the same scale and size over the same 20-year period.Therefore, it is anticipated that this alternative and the proposed project would result in similar significant water quality impacts during construction.[Similar] Both the Traffic/Air Emissions Reduction Alternative and the proposed project would convert 815 acres from primarily �— agricultural uses to mixed urban uses and thus would generate urban runoff that would eventually be discharged to Mountain House Creek and Old River.As indicated in Table 4.8-5 in Section 4.8,"Water Quality,"contaminant loading under the proposed project with BMPs incorporated would be less for each of the constituents evaluated than is currently generated on the project site by the existing agricultural uses.Therefore,the proposed project would result in less-than-significant water quality impacts during operation.Because the two scenarios would be of the same size and generally of the same scale,and because the same water quality basins and BMPs would be implemented under each scenario,the level of impact would be similar.[Similar] College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 5-21 Alternatives to the Proposed Project