Appendix A Historic Property Survey Report

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ARCHAEOLOGICAL SURVEY REPORT FAIRVIEW STREET IMPROVEMENTS FROM 9TH STREET TO 16TH STREET AND JUNE 2019 BRIDGE REPLACEMENT PROJECT SANTA ANA, CALIFORNIA would be completed during separate periods so that SART users can be detoured to the trail on the opposite side of the Santa Ana River at 5th Street. There are gates and ramps located on both sides of the SART at 5th Street that provide access to bicyclists and pedestrians for these detours. Details regarding the detour are being coordinated with OC Parks. Other short-term closures of up to 15 minutes would be allowed with flagmen. A temporary detour within the river bed may be required as a contingency. This would involve construction of dirt and gravel ramps with asphalt topping to and from the SART and the river bed. Construction vehicles would access the Santa Ana River from the gate and ramp at the County of Orange access road at the northwest corner of the bridge, and would use the existing concrete access ramp into the river approximately 250 ft west of the project area. All access roads to the SART that are utilized by construction vehicles or for detour routes would be reconstructed and restored to preconstruction conditions or better prior to project completion. The vertical APE for the roadway extends to a depth of 2 feet, while bridge abutment excavation will extend to a depth of 15 feet. Additionally, excavation for utilities will extend to a maximum depth of 4 feet (HPSR, Attachment A, Map 3 — APE Map; also Archaeological Survey Report Appendix A, Figure 3 —Survey Coverage Map). The APE is shown on the United States Geological Survey (USGS) Anaheim, California 7.5-minute topographic quadrangle map (USGS 1981) within Township 5 South, Range 10 West along the east side of the northeast quarter, as well as in the southeast quarter of Section 10. The APE is located between elevations of 88 and 98 feet. The highest elevation in the APE is on the banks, both north and south, of the Santa Ana River. The lowest elevation in the APE is at the southern end of the APE near Civic Center Drive. Although there is some elevation change due to the banks for the Santa Ana River, the landform in the vicinity is relatively level, with slope to the south-southwest. AREA OF POTENTIAL EFFECTS The APE encompasses 11.93 acres and includes all areas in which the project has the potential to directly or indirectly affect historic properties if any such properties exist (HPSR, Attachment A, Map 3). Physical project impacts are generally limited to the project's proposed and existing right-of-way and include the horizontal and vertical limits associated with ground -disturbing activities. The vertical APE within the APE will extend to a maximum depth of 15 feet for the bridge abutments. Areas of indirect effects will extend beyond those of the direct effects and include areas that may be indirectly affected by visual, noise, and other effects. Areas of indirect effects generally include all properties directly adjacent to the proposed right-of-way unless they are undeveloped or unless potential indirect effects will be unlikely due to sufficient distance between the construction footprint and any development. Approximately 3.92 acres of the APE was surveyed for archaeological resources (Appendix A, Figure 3—Survey Coverage Map). The area surveyed includes both undeveloped areas and areas covered with vegetation where underlying sediment was reasonably visible. Areas of the 11.93 acre APE not surveyed included Fairview Street and areas that are only subject to indirect impacts (such Q:\WKE1702\Cultural\ASR\ASR 2019 OS-21.docx (06/03/19) 4