2017-046 - Approving Addendum Nos. 1 and 2

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Santa Ana/Garden Grove Fixed Guideway Project Addendum materials, the APE has the possibility of containing intact, undisturbed cultural deposits below the level of previous disturbance. As such, important archaeological resources may exist within the APE. The potential exists that construction activities associated with ground disturbance may unearth undocumented archaeological resources. Implementation of Mitigation Measure CR 1 of the EIR MMRP would ensure that measures are taken to minimize potential effects to archaeological resources. Therefore, no adverse effects would occur to archaeological resources as a result of the design modifications, and no change to the previously -adopted Mitigation Measure CR 1 would be required. The proposed utility and storm drain modifications, the repositioning of double -track and platforms, placing single crossovers, restriping Santa Ana Boulevard, and repositioning of platforms would occur almost entirely within the street and PE ROW, which have been previously disturbed with pavement, utility lines and a previous rail line. Within the street ROW, construction would require a depth of approximately 18 inches below ground surface of excavation for placement of foundation material and laying track. Additional depth of excavation may be required for utility relocations and foundation construction for the TPSSs at a depth of five feet or less, but this would not likely encounter previously undisturbed soil. These areas are all located in previously disturbed areas with underground infrastructure along the street ROW, and the potential for the accidental discovery of archeological resources is low. The construction and operation of the proposed Project would not disrupt the essential form or integrity of the historic properties in the expanded APE. Further, the design modifications would not result in visual, audible, or atmospheric intrusions beyond those noted in the 2014 cultural resources evaluation. Based on the expanded 2016 APE, the sensitivity of the area for archaeological resources and the recommendation for archaeological monitoring to be conducted for earth -disturbing activities that could encounter previously undisturbed soils is unchanged, and should remain consistent with the EIR. The updated analysis confirms that there are no changes to the previous conclusions regarding cultural resources as a result of the engineering refinements and that a less than significant impact would result from the Project modifications within the revised/expanded APE for the Project modifications. No additional cultural resource impact would occur and the conclusions and mitigation measure (Mitigation Measure CR 1) identified in the EIR remain accurate and applicable to the proposed Project modifications. Geolop, Soils, and Seismicity The potential geology, soils, and seismicity impacts associated with the construction and operation of the Project were evaluated in the EIR. Since the certification of the EIR, there have been no changes to the geological, soils or seismic environment or changes to the characteristics of the proposed Project as evaluated in the EIR that would affect these resources. The EIR concluded that impacts related to geologic and seismic hazards were less than significant and that no mitigation measures are required. No additional geology, soils, and seismicity impact would occur and the conclusions regarding no significant impacts identified in the EIR remain accurate. BSP age 1170726.1