Appendix A Paleontological Analysis

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9/22/19 «P:\WKE1702\Paleo\September 2018 Submittal\Fairview Street Improvements_Draft Paleo Memo 090718.docx» 2 7.5‐minute topographic quadrangle map in unsectioned lands of the Los Angeles Land Grant (USGS, 1981; see Figure 1, provided in Attachment B). PROJECT DESCRIPTION The proposed Project includes widening Fairview Street between 9th Street and 16th Street, including replacing the Fairview Street bridge crossing over the Santa Ana River. The proposed Project would widen Fairview Street from two lanes in each direction to three lanes in each direction. Fairview Street bridge would be replaced with a new six‐lane bridge (three lanes in each direction), including a complete bridge deck with barrier rails, sidewalks, bicycle lanes, a raised median, and lighting. The proposed bridge would be expanded from approximately 52 feet (ft) to 100 ft in width, and would have the same roadway profile as the existing bridge. The eight pier walls that support the existing bridge would be removed, and four new pier walls would be constructed to support the new bridge. The proposed Project would acquire partial right‐of‐way take from three parcels (two commercial parcels [Assessor’s Parcel Numbers (APNs) 405‐213‐02 and 405‐213‐01] and one single‐family residence [APN 405‐213‐14]). An existing 12‐inch water line and a bank of 12 phone conduits cross the Santa Ana River, suspended under the deck of the existing bridge. These utilities would need to be temporarily relocated during construction and then permanently relocated to the new bridge. Water quality best management practices (BMPs) would be included to treat stormwater runoff such as a vegetated swale adjacent to Fairview Street in the Fairview Triangle rest area. Fairview Street would remain open during the construction period with two southbound lanes and one northbound lane, with lanes shifted to one side of the bridge while the other side is replaced. Therefore, no detours would be required for vehicles traveling along Fairview Street. Access to properties would be maintained. During construction, pedestrians and bikes would be detoured away from the Fairview Street bridge to the 17th Street Bridge to cross the Santa Ana River by way of the Santa Ana River Trail (SART) between the hours of 9:00 a.m. and 7:00 p.m., when the gates to the SART are open and unlocked. After hours, pedestrians and bicyclists who wish to cross the Santa Ana River would be detoured to adjacent City streets such as King Street. Construction of the proposed Project would require temporary closure of a portion of the SART for the demolition and placement of the bridge superstructure. The SART includes a Class I bike path on the eastern side and a regional riding and hiking trail on the western side. The portion of the SART affected by project construction would need to be temporarily closed four times for approximately 8 hours each time during two summer periods for the placement of precast concrete girders. During these periods, SART users would be detoured and signage would be provided to display the dates of the closures and to identify the detour routes. Work on the north and south sides of the bridge