Amphibians and Aquatic Reptiles Technical Report
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SACRAMENTO MUNICIPAL UTILITY DISTRICT UPPER AMERICAN RIVER PROJECT (FERC Project No. 2101) and PACIFIC GAS AND ELECTRIC COMPANY CHILI BAR PROJECT (FERC Project No. 2155) AMPHIBIANS AND AQUATIC REPTILES TECHNICAL REPORT Prepared by: Devine Tarbell & Associates, Inc. Stillwater Sciences Sacramento, California Davis, California Prepared for: Sacramento Municipal Utility District Sacramento, California and Pacific Gas and Electric Company San Francisco, California APRIL 2005 Version 3 Pacific Gas and Electric Company Sacramento Municipal Utility District Chili Bar Project Upper American River Project FERC Project No. 2155 FERC Project No. 2101 TABLE OF CONTENTS Section & Description Page 1.0 INTRODUCTION .............................................................................................................. 1 2.0 BACKGROUND ................................................................................................................ 2 2.1 Amphibian and Aquatic Reptiles Study Plan.......................................................... 3 2.2 Water Year Type..................................................................................................... 3 2.3 Agency Requested Information .............................................................................. 4 3.0 METHODS ......................................................................................................................... 4 3.1 Phase I - Compile and Review Existing Information ............................................. 4 3.2 Phase II - Identify Potential Habitat and Select Sampling Sites............................. 5 3.2.1 Identification of Potential Habitat............................................................... 5 3.2.2 Selection of VES Sites................................................................................ 6 3.3 Phase III - Conduct Visual Encounter Surveys (VES) ......................................... 13 3.3.1 Mountain Yellow-Legged Frog ................................................................ 14 3.3.2 Foothill Yellow-Legged Frog................................................................... 14 3.3.3 California Red-Legged Frog..................................................................... 15 3.3.4 Western Pond Turtle ................................................................................. 15 4.0 RESULTS ......................................................................................................................... 15 4.1 Historical Information........................................................................................... 15 4.1.1 Mountain Yellow-Legged Frog ................................................................ 16 4.1.2 Foothill Yellow-Legged Frog................................................................... 17 4.1.3 California Red-Legged Frog..................................................................... 17 4.1.4 Western Pond Turtle ................................................................................. 18 4.2 Habitat Description and VES Results................................................................... 19 4.2.1 Upper Elevation Sites ............................................................................... 19 4.2.2 Lower Elevation Sites............................................................................... 27 4.2.3 Reach Downstream of Chili Bar............................................................... 38 5.0 ANALYSIS....................................................................................................................... 47 5.1 Mountain Yellow-Legged Frog ............................................................................ 47 5.2 Foothill Yellow-Legged Frog............................................................................... 48 5.2.1 UARP........................................................................................................ 48 5.2.2 Reach Downstream of Chili Bar............................................................... 49 5.3 California Red-Legged Frog................................................................................. 49 5.3.1 UARP........................................................................................................ 50 Amphibians and Aquatic Reptiles Technical Report 04/20/2005 Copyright © 2005 Sacramento Municipal Utility District and Pacific Gas & Electric Company Page TOC i Sacramento Municipal Utility District Pacific Gas and Electric Company Upper American River Project Chili Bar Project FERC Project No. 2101 FERC Project No. 2155 TABLE OF CONTENTS Section & Description Page 5.3.2 Reach Downstream of Chili Bar............................................................... 50 5.4 Western Pond Turtle ............................................................................................. 51 5.4.1 UARP........................................................................................................ 51 5.4.2 Reach Downstream of Chili Bar............................................................... 51 6.0 LITERATURE CITED..................................................................................................... 51 Amphibians and Aquatic Reptiles Technical Report 04/20/2005 Page TOC ii Copyright © 2005 Sacramento Municipal Utility District and Pacific Gas & Electric Company Pacific Gas and Electric Company Sacramento Municipal Utility District Chili Bar Project Upper American River Project FERC Project No. 2155 FERC Project No. 2101 LIST OF TABLES Table No. & Description Page Table 2.2-1. Water year types applied to individual months of years 2001-2004...................4 Table 3.2-1. Special-status amphibian and aquatic reptile species with the potential to occur in the study area that may be impacted by activities of the projects.....5 Table 3.2-2. VES sites for the UARP area and the Reach Downstream of Chili Bar.............9 Table 4.1-1. Historical sightings of mountain yellow-legged frog in the UARP vicinity.....16 Table 4.1-2. Historical sightings of foothill yellow-legged frog in the UARP and Chili Bar Project vicinity. .................................................................................17 Table 4.1-3. Historical sightings of California red-legged frog in the UARP and Chili Bar Project vicinity. .................................................................................18 Table 4.1-4. Historical sightings of western pond turtle in the UARP and Chili Bar Project vicinity. .................................................................................18 Table 4.2-1. Habitat characteristics of upper elevation VES sites in the UARP area...........20 Table 4.2-2. Incidental observations of aquatic herpetofauna at upper elevation sites in the UARP area. .............................................................................................26 Table 4.2-3. Habitat characteristics for lower elevation VES sites in the UARP area..........28 Table 4.2-4. Egg mass habitat characteristics at three lower elevation sites in the UARP area. .............................................................................................31 Table 4.2-5. Tadpole habitat characteristics at lower elevation sites in the UARP area.......33 Table 4.2-6. Number of juvenile and adult foothill yellow-legged frogs observed. .............35 Table 4.2-7. Number of non-target aquatic herpetofauna observed at lower elevation sites in the UARP area.......................................................................36 Table 4.2-8. Habitat characteristics for VES sites in the Reach Downstream of Chili Bar ..40 Table 4.2-9. Tadpole habitat characteristics at sites in the Reach Downstream of Chili Bar............................................................................................................44 Table 4.2-10. Number of non-target aquatic herpetofauna observed in the Reach Downstream of Chili Bar. ......................................................................46 Amphibians and Aquatic Reptiles Technical Report 04/20/2005 Copyright © 2005 Sacramento Municipal Utility District and Pacific Gas & Electric Company Page TOC iii Pacific Gas and Electric Company Sacramento Municipal Utility District Chili Bar Project Upper American River Project FERC Project No. 2155 FERC Project No. 2101 LIST OF FIGURES (Located after text) Figure No. & Description 4.1-1 Previous sightings of mountain yellow-legged frog in the vicinity of the study area. 4.1-2 Previous sightings of foothill yellow-legged frog in the vicinity of the study area. 4.1-3 Previous sightings of California red-legged frog and Western pond turtle in the vicinity of the study area. 4.2-1 Location of FYLF egg mass 1-A at Site C-3, looking downstream at right bank. 4.2-2 Location of FYLF egg mass 1-A at Site C-3, egg mass attached beneath boulder to the left of submerged cobbles. 4.2-3 Location of FYLF egg mass 1-A at Site SFA-3, looking at left bank. 4.2-4 Location of FYLF egg mass at Site SFA-3, looking at left bank. 4.2-5 Location of FYLF egg mass 1-A at Site SFA-5, looking upstream at left bank. 4.2-6 Location of FYLF tadpole group 1-A at Site C-3, looking upstream at right bank. 4.2-7 Location of FYLF tadpole group 3-A at Site C-3, looking upstream at right bank. 4.2-8 Location of FYLF tadpoles at Site SFA-4, looking at right bank. 4.2-9 Location of FYLF tadpoles at Site SFA-3, looking at left bank, downstream end of site. 4.2-10a Length frequency distribution of juvenile and adult foothill yellow-legged frog at Site C-3 by visit