OPEN SPACE RESOURCE MANAGEMENT PLAN TOWN OF TIBURON, MARIN COUNTY, CALIFORNIA Adopted by Tiburon Town Council November 17, 2010 OPEN SPACE RESOURCE MANAGEMENT PLAN TOWN OF TIBURON, MARIN COUNTY, CALIFORNIA Submitted to: Town of Tiburon 1505 Tiburon Boulevard Tiburon, California 94920 (415) 435-7392 Prepared by: LSA Associates, Inc. 157 Park Place Point Richmond, California 94801 (510) 236-6810 LSA Project No. TOT0801 November 2010 TABLE OF CONTENTS EXECUTIVE SUMMARY.....................................................................................................................I PROJECT PURPOSE ...................................................................................................................I KEY ISSUES................................................................................................................................I MANAGEMENT PRIORITIES ................................................................................................. II VEGETATION AND SENSITIVE NATURAL RESOURCES ................................................ II Vegetation..........................................................................................................................ii Non-Native Species ...........................................................................................................ii Sensitive Resources ...........................................................................................................ii RECOMMENDED MANAGEMENT ACTIVITIES................................................................III OPEN SPACE PARCEL DESCRIPTIONS ..............................................................................III APPENDIX A DISCUSSION ...................................................................................................IV 1.0 INTRODUCTION.....................................................................................................................1 1.1 PROJECT PURPOSE.......................................................................................................1 1.2 PROJECT AREA..............................................................................................................1 1.3 KEY ISSUES....................................................................................................................2 1.3.1 Biological Resource Values.................................................................................3 1.3.2 Invasive Species ..................................................................................................3 1.3.3 Fire Prone Vegetation..........................................................................................3 1.3.4 Passive Recreation...............................................................................................3 1.3.5 Erosion.................................................................................................................4 1.3.6 Coordination with Other Jurisdictions.................................................................4 1.3.7 Public Education..................................................................................................4 1.4 MANAGEMENT PRIORITIES.......................................................................................4 2.0 VEGETATION AND SENSITIVE NATURAL RESOURCES...............................................6 2.1 VEGETATION.................................................................................................................6 2.1.1 Oak Woodland.....................................................................................................6 2.1.2 Willow Scrub.......................................................................................................7 2.1.3 Coyote Brush Scrub.............................................................................................7 2.1.4 California Sagebrush Scrub .................................................................................7 2.1.5 French Broom Scrub............................................................................................7 2.1.6 Wetland Vegetation .............................................................................................7 2.1.7 Grassland (Mosaic of Native and Non-native Grasslands)..................................8 2.1.8 Native Grassland..................................................................................................8 2.1.9 Serpentine Grassland ...........................................................................................8 2.1.10 Serpentine Outcrops ............................................................................................9 2.1.11 Non-Native Grassland.........................................................................................9 2.1.12 Backyard/Ornamental........................................................................................10 2.2 INVASIVE SPECIES AND NOXIOUS WEEDS..........................................................10 2.2.1 Acacia ................................................................................................................10 2.2.2 Bamboo..............................................................................................................10 2.2.3 Blue-Gum Eucalyptus........................................................................................10 2.2.4 French Broom/Scotch Broom............................................................................11 2.2.5 Himalayan Blackberry.......................................................................................11 2.2.6 Myoporum .........................................................................................................11 2.2.7 Pampas Grass.....................................................................................................11 P:\TOT0801\Tiburon RMP\Management Plan 9.doc (11/8/2010) i 2.2.8 Pine....................................................................................................................12 2.2.9 Pittosporum........................................................................................................12 2.2.10 Plum ..................................................................................................................12 2.2.11 Pride of Madeira................................................................................................12 2.2.12 Star-Thistles ......................................................................................................13 2.2.13 Sweet Fennel .....................................................................................................13 2.2.14 Thistles ..............................................................................................................13 2.3 SENSITIVE RESOURCES............................................................................................14 2.4 SPECIAL-STATUS SPECIES .......................................................................................14 2.4.1 Tiburon Jewelflower (Streptanthus niger).........................................................14 2.4.2 Tiburon (Indian) Paintbrush (Castilleja affinis ssp. neglecta)...........................14 2.4.3 Marin Dwarf Flax (Hesperolinon congestum)...................................................15 2.4.4 Tiburon Buckwheat (Eriogonum luteolum var. caninum) .................................16 2.4.5 Marsh Zigadene (Zigadenus micranthus var. fontanus) ....................................16 2.4.6 Tiburon Microblind Harvestman (Microcina tiburona) ....................................17 2.4.7 Opler’s Longhorn Moth (Adela oplerella) ........................................................17 3.0 RECOMMENDED MANAGEMENT ACTIVITIES.............................................................18 3.1 FUEL LOADING AND FIRE MANAGEMENT ..........................................................18 3.1.1 Fire Protection ...................................................................................................18 3.1.2 Fire Hazards.......................................................................................................19 3.1.3 Suggested Vegetation Treatment Protocols.......................................................19 3.2 VEGETATION MANAGEMENT METHODS.............................................................20 3.2.1 Hand Labor........................................................................................................21 3.2.2 Mechanical Treatment .......................................................................................21 3.2.3 Herbicides..........................................................................................................22 3.2.4 Prescribed Burning ............................................................................................23 3.2.5 Grazing ..............................................................................................................24 3.2.6 Evaluation of Vegetation Treatment Methods...................................................26 3.3 TREATMENT OF VEGETATION TYPES ON TIBURON OPEN SPACE ................27 3.3.1 Grassland ...........................................................................................................27 3.3.2 Scrub..................................................................................................................27 3.3.3 Oak Woodland...................................................................................................27 3.3.4 Wetlands and Watercourses...............................................................................28