Appendix A Paleontological Analysis

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Vertebrate Paleontology Section Telephone: (213) 763-3325 e-mail: smcleod@nhm.org 23 February 2018 LSA Associates, Inc. 20 Executive Park, Suite 200 Irvine, California 92614 Attn: Sarah Rieboldt, Ph.D., Senior Paleontological Resources Manager re: Paleontological Resources Records Check for the proposed Fairview Street Widening and Bridge Replacement Project, LSA Project # WKE1702, in the City of Santa Ana, Orange County, project area Dear Sarah: I have thoroughly searched our paleontology collection records for the locality and specimen data for the proposed Fairview Street Widening and Bridge Replacement Project, LSA Project # WKE1702, in the City of Santa Ana, Orange County, project area as outlined on the portion of the Anaheim USGS topographic quadrangle map that you sent to me via e-mail on 9 February 2018. We do not have any vertebrate fossil localities that lie within the proposed project area boundaries, but we do have localities nearby from the same sedimentary units that may occur subsurface in the proposed project area. The entire proposed project has surface deposits of younger Quaternary Alluvium, derived as fluvial deposits from the Santa Ana River that flows through the northern portion of the proposed project area. These deposits are unlikely to contain significant vertebrate fossils in the uppermost layers, but older Quaternary deposits occurring at varying depths may well contain significant fossil vertebrate remains. Our closest vertebrate fossil locality from older Quaternary deposits is probably LACM 1339, south-southwest of the proposed project area in Costa Mesa east of the Santa Ana River near the top of the mesa bluffs along Adams Avenue, that produced fossil specimens of mammoth, Mammuthus, and camel, Camelidae, bones from sands approximately 15 feet below the top of the mesa that is overlain by shell bearing silts and sands.