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Wildlife Connectivity Assessment
Presenters: Bill Goggin and John koMay 2017
Bakersfield to Palmdale Project Section
HIGH-SPEED RAIL: Connecting California
STUDY AREA
• Tehachapi Mountains» Critical Linkage
• Approximately 80 miles (Bakersfield to Palmdale)» 74% At-Grade» 14% Elevated» 12% Underground
At-Grade Sections
PROJECT DESIGN FEATURES
Tunnel Sections
Double Bore Tunnel Single Bore Tunnel
At-Grade Fill Section At-Grade Cut Section
Bridge and ViaductSegments
PROJECT DESIGN FEATURES
Viaducts Profile
Viaduct Rendering
REGIONAL CORRIDOR STUDY• Missing Linkage Study» Cost Raster Data • Land Cover• Road Density• Elevation• Topographic Position
» Least Cost Corridors• Mountain Lion• Mule Deer• American Badger• Western Gray Squirrel• San Joaquin Kit Fox• Blunt-nosed Leopard Lizard• Tipton Kangaroo Rat
ListedSpecies
REGIONAL CORRIDORS• Tehachapi Linkage Design» Based on least cost corridors
• Conserved and Protected Lands
• Future Conservation Dedication
HOW TO MEASURE PERMEABILITY?• How do we differentiate?
• Bakersfield to Palmdale Permeability» 74% of alignment at-grade segments and 26% (viaducts and tunnels)» 62 crossing opportunities (green arrows) - 53 viaducts and 9 tunnels
METHODS - LOCAL PERMEABILITY ASSESSMENT (LPA)
• Focal species» Mt. Lion» Mule deer» Badger» Blunt-nosed leopard lizard» San Joaquin kit fox» Desert tortoise» Tipton K-rat» Desert kit fox» Western gray squirrel
ListedSpecies
• Green = origin and destination habitat• Red = wildlife movement habitat
6 km
• Movement Cost Data» Land cover type» Road density» Elevation» Topographic position
CORRIDOR MODEL FUNCTION OUTPUTS• Using ArcGIS Corridor function
ProjectExisting Conditions
• Quantify Results» Mean Accumulative Movement Cost • Sum of Raster
» Moving Window Average• 90m radius every 50m
• Model Runs - Scenarios» Existing Conditions» Project» Project with Crossings
RESULTS – LOCAL PERMEABILITY ASSESSMENT
Sum of Raster
• Crossing Intervals:» Small Crossings every 0.3 miles – 6ft culvert» Large Crossings every 1.0 miles – 20 ft culvert or bridge structure
• Length – less than 200 ft • Slope – less than 2%• Substrate – natural bottom substrate• Grade – near natural grade
WILDLIFE CROSSING PARAMETERS
SAN JOAQUIN KIT FOX PERMEABILITY VISUALIZATION
SAN JOAQUIN KIT FOX PERMEABILITY VISUALIZATION
MOUNTAIN LION PERMEABILITY VISUALIZATION
MOUNTAIN LION PERMEABILITY VISUALIZATION
CONSIDERATION OF CONTEXT
RoadkillVegetation
Road Infrastructure
Aerial Photograph Hydrology
Stakeholders
Conserved Land
Engineering
PRELIMINARY CROSSING LOCATIONS
PRELIMINARY CROSSING LOCATIONS
WILDLIFE CROSSING CONCEPT - PRELIMINARY RENDERING
Small Crossing Dual-Use Road Undercrossing
Dual-Use Road Overcrossing Dual-Use Drainage Crossing
IMPACT AVOIDANCE AND MINIMIZATION FEATURES
Restoration and Revegetation Plan
Biological Resources Management Plan
Annual Vegetation Management Plan
Weed Control Plan
Security Fence Maintenance Plan
Construction Work Windows
Biological Monitoring During Construction Activities
Entrapment Prevention
Equipment Staging Areas
Consider habitat connectivity/animal movement when mitigating for listed species
Dewatering and Water Diversion
Compliance Reporting
Construction Site Best Management Practices
Night Lighting
Construction Noise Reduction Measures
Wildlife Exclusion Fencing
Vehicle/Equipment Traffic Controls
Refine• Refine Design from 15 Percent Moving Forward
• Stakeholder Engagement
• Agency Consultation
• Refine
• Build
NEXT STEPS
DISCUSSION AND QUESTIONS
CONTACT INFORMATIONBakersfield to Palmdale Project Section WCA Contacts
Southern California Regional Office California High-Speed Rail Authority 700 N. Alameda St. Room 3-359Los Angeles, CA 90012www.hsr.ca.gov
@cahsra
facebook.com/CaliforniaHighSpeedRail
@cahsra
youtube.com/CAHighSpeedRail
Bill Goggin - Sr Permitting Specialist/Certified Wildlife [email protected](916) 384-0857
John Ko - Sr Biologist/Restoration [email protected](949) 553-0666
INCREASED CROSSING DISTANCE
6km(2.73mi)
a2 + b2 = c2
a
c
b