Biological Resources Assessment
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Town of Los Gatos 15215 Shannon Road Planned Development Application PD-15-001 Initial Study | Appendices Attachment 2 Biological Resources Assessment 2/4/16 BIOLOGICAL RESOURCE ASSESSMENT FOR 10 RESERVOIR ROAD LOS GATOS, SANTA CLARA COUNTY, CALIFORNIA April 18, 2015 Prepared for: Geier & Geier Consulting, Inc. P.O. Box 5054 Berkeley, CA 94705‐5054 Prepared by: Wood Biological Consulting, Inc. 65 Alta Hill Way Walnut Creek, CA 94595 (925) 899‐1282 mike@wood‐biological.com The information provided in this document is intended solely for the use and benefit of Geier & Geier Consulting, Inc. and the Town of Los Gatos. No other person or entity shall be entitled to rely on the services, opinions, recommendations, plans or specifications provided herein, without the express written consent of Wood Biological Consulting, Inc. TABLE OF CONTENTS SECTION PAGE SUMMARY ....................................................................................................................................... ii 1.0 INTRODUCTION ....................................................................................................................... 1 1.1 PROJECT BACKGROUND AND DESCRIPTION ........................................................................... 1 2.0 METHODS AND LIMITATIONS ............................................................................................. 1 3.0 SETTING ...................................................................................................................................... 3 3.1 PLANT COMMUNITIES .............................................................................................................. 3 3.2 WILDLIFE HABITATS ................................................................................................................. 5 3.3 WILDLIFE MOVEMENT CORRIDORS ......................................................................................... 7 4.0 SPECIAL‐STATUS BIOLOGICAL RESOURCES ................................................................... 8 4.1 SPECIAL‐STATUS NATURAL COMMUNITIES ........................................................................... 9 4.1.1 Waters of the U.S. and Wetlands ....................................................................................... 9 4.1.2 Local Policies and Ordinances ......................................................................................... 13 4.1.2.1 Construction Near Streams .................................................................................. 13 4.1.2.2 Protected Trees ....................................................................................................... 17 4.2 SPECIAL‐STATUS PLANT SPECIES .......................................................................................... 19 4.3 SPECIAL‐STATUS ANIMAL SPECIES ........................................................................................ 22 5.0 DISCUSSION ............................................................................................................................. 28 5.1 SPECIAL‐STATUS NATURAL COMMUNITIES .......................................................................... 28 5.2 SPECIAL‐STATUS PLANT SPECIES .......................................................................................... 33 5.3 SPECIAL‐STATUS ANIMAL SPECIES ........................................................................................ 33 6.0 LITERATURE CITED ............................................................................................................... 37 LIST OF FIGURES FIGURE PAGE Figure 1. Project Location ............................................................................................................... 2 Figure 2. Preliminary Limits of Jurisdiction............................................................................... 12 Figure 3. Jurisdictional Impacts ................................................................................................... 14 Figure 4. Riparian Setback ............................................................................................................ 16 Figure 5. Rare Plant Records from Project Vicinity ................................................................... 21 Figure 6. Rare Animal Records from Project Vicinity .............................................................. 24 LIST OF APPENDICES A Database Printouts for Special‐Status Species B Explanation of Rarity Status Codes C Stream Analysis (LOA, 2007) D Riparian Assessment (WBC, 2008) Wood Biological Consulting, Inc. – Biological Resource Assessment, 10 Reservoir Road i SUMMARY This report presents the results of an assessment of existing or potentially occurring biological constraints to the proposed construction of a minor subdivision. This biological resource assessment report has been prepared in support of the Town’s Mitigated Negative Declaration (MND). The report provides background and site‐specific information pertaining to special‐ status plant and wildlife species and other regulated biological resources (e.g., wetlands), which may represent constraints to the proposed activity. The conclusions contained herein are based on background research, a single reconnaissance‐level site survey performed by a qualified biologist, and review of the design features. The 3.36‐acre project site encompasses three adjacent parcels (APN 529‐29‐061, 529‐29‐ 038 and 529‐29‐040) and is located at 10 Reservoir Road, Los Gatos, Santa Clara County. The subject property is situated in a heavily wooded residential neighborhood at the lower reaches of a minor ravine. The ravine conveys surface waters as an unnamed tributary to Los Gatos Creek. The dominant plant communities occurring within the study area are coast live oak woodland, and ruderal habitat. No special‐status natural communities are present on site. However, the project site does support a surface tributary with overhanging riparian habitat. As proposed, the project would result in impacts to waters of the U.S. and waters of the state, and would be regulated under the Clean Water Act and the Lake and Streambed Alteration Program. Authorization for the proposed project will be required by local, state and federal agencies. Project implementation would also result in impacts on riparian habitat and trees protected under local ordinances. The potential for occurrence of a total of 76 special‐status plant species was evaluated. Based on the altered nature of the subject parcel and surroundings, soil types, existing habitats, and geographic location, the potential for occurrence eof 71 of th target plant species can be ruled out. Based on the proposed grading plan, no specific impact avoidance or other mitigation measures are warranted. While marginally suitable habitat is present on site for the remaining five target species, their absence was confirmed during the present survey. The potential for occurrence of a total of 35 special‐status animal species was evaluated. The potential for occurrence of 28 of the target species can be ruled out entirely based on the developed nature of the subject parcel and surroundings, soil types, existing habitats, and geographic location. Although marginally suitable habitat is present for five of the target species, their presence is not expected due to limitations presented by the limited amount of habitat present, the relatively high level of human activity in the project vicinity and the geographic location of the Wood Biological Consulting, Inc. – Biological Resource Assessment, 10 Reservoir Road ii project site. Three special‐status animal species could occur on site; these include Cooper’s hawk, hoary bat, and the San Francisco dusky‐footed woodrat. Project implementation would result in potentially significant impacts on biological resources. Impact avoidance, minimization and mitigation measures are outlined in the report. With the implementation of these measures, impacts can be reduced to a less‐than significant level. Wood Biological Consulting, Inc. – Biological Resource Assessment, 10 Reservoir Road iii 1.0 INTRODUCTION This report presents the results of an assessment of existing or potentially occurring biological constraints to the proposed construction of a minor subdivision. The subject property is located at 10 Reservoir Road in the Town of Los Gatos (Figure 1). This biological resource assessment report has been prepared in support of the Town’s Mitigated Negative Declaration (MND). 1.1 Project Background and Description The project applicant is requesting approval of a lot line adjustment between four parcels to allow for future construction of two new single‐family residences on a 3.36‐ acre property, located at the southwest corner of the Reservoir Road/Cleland Avenue intersection. There are two existing single‐family residences on the largest, 2.19‐acre parcel, with access to these two homes from Reservoir Road provided by a single, 10‐ foot wide driveway. The proposed project would allow adjustment of existing lot lines to allow for future development of two new residences. Future development applications for these residences would be subject to the Architecture and Site review process. The 3.36‐acre project site currently consists of one 2.19‐acre parcel (APN 529‐29‐061) and two smaller parcels (APN 529‐29‐038 and 529‐29‐040, totaling 1.17 acres). While all three parcels have frontage on Reservoir Road, the two smaller parcels have most of the site frontage on Reservoir Road and the entire site frontage on Cleland Avenue. Project