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Appendix C: Biological Resources Appendix C: Biological Resources Description and Analysis of the Botanical Resources, Including Vascular Plant Species of Conservation Concern, at the Chevron Tank Farm Facility San Luis Obispo, California Final Report Prepared for: Chevron EMC San Luis Obispo, California December 2008 Padre Associates, Inc. WSP Environment & Energy 369 Pacific Street Ecosystem Science & Natural Resources San Luis Obispo, CA 93401 Management Services 160 Franklin Street, Suite 300 Oakland, CA 94607 C.7-1 Chevron Tank Farm EIR Appendix C: Biological Resources DISCLAIMER Padre Associates, Inc. and WSP Environment & Energy, LLC have prepared this botanical resources report for use by Chevron EMC. Results and conclusions presented in this report are based upon information available in the public domain (e.g., published literature, previous consultants’ reports, various on-line resources) and upon the Padre/WSP technical team’s on-site reconnaissance, data collection, and analyses by standard methods. Results and conclusions presented herein represent the best professional judgment of Padre Associates and WSP Environment & Energy technical staff. In this context, surveying/boundary locations of plant populations developed by Padre Associates are assumed to be true and correct. Peggy L. Fiedler Eric Snelling Peggy Lee Fiedler, Ph.D., PWS Senior Project Manager Senior Botanist/Conservation Ecologist Padre Associates, Inc. Ecosystem Science & Natural Resources Management Services WSP Environment & Energy Date Date i C.7-2 Chevron Tank Farm EIR Appendix C: Biological Resources Executive Summary One hundred fifty-two (152) vascular plant species have been identified within the property boundaries of the San Luis Obispo Tank Farm. This listing combines previous field surveys as well as the 2008 surveys by the Padre/WSP project team. Forty-nine percent (49%; 74 taxa) of the vascular plant species are native taxa, while 51% (78 taxa) are non-native (primarily naturalized) species commonly represented in the California flora. The percentage of non-native taxa on the San Luis Obispo Tank Farm is more than twice that calculated for the State as a whole, reflecting a relatively high level of site disturbance associated with past oil operations, maintenance, and abandonment, and past and continued cattle grazing. Seven species are of concern to the conservation community. Six have been identified by the California Native Plant Society as species in decline, and are therefore acknowledged under the California Environmental Quality Act as significant biological resources at the San Luis Obispo Tank Farm. ii C.7-3 Chevron Tank Farm EIR Appendix C: Biological Resources Description and Analysis of the Botanical Resources, Including Vascular Plant Species of Conservation Concern, at the Chevron Tank Farm Facility, San Luis Obispo, California Table of Contents I. Introduction & Background………………………………………………………….. I-1 II. Overview of Site Characteristics……………………………………………………. II-1 A. Current and Historic Land Uses………………………………………………… II-1 B. Geomorphology and Landscape Context…………............................................... II-1 C. Climate…………………………………………………………………………… II-2 III. Vegetation……………………………………………………………………………. III-1 A. Background & Overview…………………………………………………………. III-1 B. Overview of Vascular Plants of SLO Tank Farm ………………………………….. III-3 C. Vegetation Classification at SLO Tank Farm……………………………………… III-4 1. Rationale Support Classification of SLO Tank Farm Plant Communities……. III-4 2. Plant Communities at the SLO Tank Farm…………………………………… III-4 a. Upland Plant Communities………………………………………………... III-6 i. Non-Native Grassland………………………………………………….. III-6 ii. Serpentine Bunchgrass Grassland……………………………………… III-6 iii. Central (Lucian) Coastal Scrub………………………………………... III-6 b. Waters/Wetlands Plant Communities…………………………………….. III-7 i. Palustrine Persistent Emergent Vernal Freshwater Marsh………………. III-7 ii. Palustrine Nonpersistent Emergent Vernal Swale/Pool………………. III-7 iii. Palustrine Scrub-Shrub Broad-Leaf Deciduous Valley Stream-Bank Wetland………………………………………………………………... III-8 iv. Palustrine Forested Broad-Leaf Deciduous Valley Stream-Bank Wetland………………………………………………………………… III-8 c. Other Habitat Types………………………………………………………. III-9 i. Serpentinite Rock Outcrop……………………………………………… III-9 ii. Ruderal/Urban………………………………………………………….. III-9 IV. Vascular Plant Species of Conservation Concern………………………………... IV-1 A. Field Survey Methods ……………………………………………………………. IV-1 B. Vascular Plant Species of Conservation Concern at the SLO Tank Farm Project Site ……………………………………………………………………………….. IV-3 1. Calystegia subacaulis ssp. episcopalis …………………………………………… IV-3 2. Castilleja densiflora ssp. obispoensis …………………………………………… IV-4 3. Centromadia parryi var. congdonii ……………………………………………… IV-5 4. Dudleya abramsii ssp. bettinae …………………………………………………. IV-6 5. Eryngium aristulatum var. hooveri ……………………………………………… IV-7 C. Other Vascular Plant Species Of Note………………………………………………… IV-8 1. Purple Needlegrass (Nassella pulchra) Grassland……………………………... IV-8 2. California Walnut (Juglans californica) Woodland…………………………… IV-9 iii C.7-4 Chevron Tank Farm EIR Appendix C: Biological Resources V. Impacts to Plant Species of Conservation Concern……………………………….. V-1 A. Impact Discussion……..…………………………………………………………………... V-1 VI. Management Recommendations for Protected Species and Habitats………….. VI-1 A. Regulatory Requirements…………………………………………………………………... VI-1 1. California Native Plant Society (CNPS)……………………………………….. VI-1 2. California Environmental Quality Act (CEQA)……………………………….. VI-1 B. Seed/Propagule Collection Strategy………………………………………………. VI-2 C. Propagation Recommendations……………………………………………………. VI-6 D. Measuring Success………………………………………………………………… VI-7 E. Recommended Mitigation Measures………………………………………………. VI-7 1. General Measures………………………………………………………………. VI-7 2. Protective Measures for Special-Status Plants…………………………………. VI-8 VII. Literature Cited………………………..…………………………………………… VII-1 APPENDICES Appendix A. Vascular Plant Species of the Chevron SLO Tank Farm, San Luis Obispo California. Appendix B. Revised Genetic Guidelines for Propagule Collection (Guerrant et al. 1994). Appendix C. Golden Gate National Recreation Area Planning Guidelines for Establishment of a Native Plant Nursery (Young, B., no date. http://www.parksconservancy.org/our_work/native_plants/index.asp). Appendix D. Nursery Propagule Collection and Growqing Guidelines to Avoid Genetic Degradataion on Restoration Sites (http://www.parksconservancy.org/our_work/native_plants/index.asp). Appendix E. Golden Gate National Parks Conservancy Nursery Safety Manual (http://www.parksconservancy.org/our_work/native_plants/index.asp). iv C.7-5 Chevron Tank Farm EIR Appendix C: Biological Resources List of Figures Figure 1. Chevron SLO Tank Farm Project Site (from Padre Associates, Inc. 2007) …. I-1 Figure 2. Aerial Image of Chevron SLO Tank Farm Project Site (Flight Date February 4, 2008).………………………………………………………………………………….. I-2 Figure 3. Plant Communities on the SLO Tank Farm Project Site ………..………...... III-5 Figure 4. Geographic Distribution of Rare Plants on the SLO Tank Farm Project Site…. IV-2 Figure 5. Sample Population Density of Cambria Morning Glory (Calystegia subacaulis ssp. episcopalis) at the SLO Tank Farm Project Site……………………………………... IV-3 Figure 6. Sample Population Density of San Luis Obispo Owl’s Clover (Castilleja densiflora ssp. obispoensis) at the SLO Tank Farm Project Site………………………… IV-4 Figure 7. Sample Population Density of Congdon’s Tar Plant (Centromadia parryi ssp. congdonii) at the SLO Tank Farm Project Site………………………………………….. IV-5 Figure 8. Sample Population Density of San Luis Obispo Serpentine Dudleya (Dudleya abramsii ssp. bettinae) at the SLO Tank Farm Project Site……………………………… IV-6 Figure 9. Sample Population Density of Hoover’s Button-Celery (Eryngium aristatulum var. hooveri) at the SLO Tank Farm Project Site………………………………………… IV-7 Figure 10. Recommended Propagule Collection Locations for the Rare Plants at the SLO Tank Farm Project Site……………………………………………………………… VI-3 List of Tables Table 1. Plant Species of Conservation Concern and Their Protected Status, and Approximate Areas (Acres) at the SLO Tank Farm Project Site, San Luis Obispo, California………………………………………………………………………………… III-3 Table 2. Estimated impacts to Rare Plant Species and Sensitive Habitat Areas Associated with Each Project Component……………………………………………….. V-1 Table 3. Summary of Recommended Guidelines for Genetic Sampling for Conservation Collections (Table 5.1 in Guerrant & Pavlik 1998, reprinted with permission) …………. VI-4 v C.7-6 Chevron Tank Farm EIR Appendix C: Biological Resources List of Photographs Photograph 1. SLO Tank Farm Project Site looking north from the southern portion across Tank Farm Road…………………………………………………………………. II-1 Photograph 2. Non-native herbaceous species dominate the grasslands on the project site, including wild oats (Avena barbata), mayweed (Anthemis cotula), and fennel (Foeniculum vulgare) featured in the foreground………………………………………… II-2 Photograph 3. Non-native annual grassland at the San Luis Obispo Tank Farm Site…... III-6 Photograph 4. Central (Lucian) Coastal Scrub at the San Luis Obispo Tank Farm Site... III-6 Photograph 5. Palustrine Persistent Emergent Vernal Freshwater Marsh at the San Luis Obispo Tank Farm Site…………………………………………………………………… III-7 Photograph 6a & b. Palustrine Persistent Emergent Vernal Swale/Pool at the San Luis Obispo Tank Farm Site…………………………………………………………………… III-7 Photograph 7. Palustrine Non-persistent Emergent Vernal Swale/Pool at the San
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