devil’s slide tunnel project: home of the california red-legged frog richard vonarb district 4...
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![Page 1: Devil’s Slide Tunnel Project: Home of the California red-legged frog Richard Vonarb District 4 Office of Biological Science and Permitting California Department](https://reader036.vdocuments.site/reader036/viewer/2022070411/56649cd55503460f9499cc71/html5/thumbnails/1.jpg)
Devil’s Slide Tunnel Project:Home of the California red-legged frog
Richard VonarbDistrict 4 Office of Biological Science and Permitting
California Department of Transportation
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California red-legged frog Rana draytonii
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Project Location
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EXISTING HIGHWAY 1RIGHT-OF-WAY TO BE
RELINQUISHED TO THECOUNTY OF SAN MATEO
NORTH PORTAL
BRIDGE
SOUTH PORTAL
SOUTH ROCK CUT
DISPOSAL AREA / OMC
SITE
NEW ROADWAY
TUNNELS
Project Overview
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• Dual Tunnels – 4,200 feet long• Tandem Bridges – 1,000 feet long• Disposal Site – 520,000 m3 capacity• Operations and Maintenance Center (OMC)• Wetland Mitigation Site – 5 ½ acres • Habitat Restoration of Construction Areas and
Disposal Site
EXISTING HIGHWAY 1 TO BE RELINQUISHED TO SAN MATEO COUNTY
NORTH PORTAL
BRIDGES
SOUTH PORTAL
SOUTH ROCK CUT
NEW ROADWAY
TUNNELS
DISPOSAL SITE / OMC SITE
SOUTH PORTAL
BRIDGES
MITIGATION SITE
Project Summary
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On-going Biological Tasks:• Construction monitoring• Permit compliance • Attendance at project team meetings• Biological evaluation and permit amendments for CCO designs• Long-term mitigation monitoring• Evaluate public access impacts• Agency coordination: California red-legged frog 1
San Francisco dusky-footed woodrat house
Anna’s hummingbird chicks 2
Peregrine falcon 3
Vegetation monitoring
Photo C
redits: 1-K. W
iseman; 2 – R
. Wilm
ing; 3 – R.
Aram
ayo
Biological Issues
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Exclusion Fencing
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Bridge: September 2008
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Bridge Site Overview
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Bridge Site Overview
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South Portal, Disposal Site, OMC
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Approximate Location ofPeregrine Falcon Nest Ledge
Devil’sPromontory
State Route 1
South Portal
Peregrine Eyrie and South Portal
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Disposal Site and OMC Overview
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Charthouse Mitigation Site:
September 2008
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California red-legged frog (Rana draytonii)Status: Federal threatened
• Existing ponds at Shamrock Ranch were protected.• New breeding pond created at Shamrock Ranch.• Frogs excluded from the jobsite to the degree possible with fences and traps.• Biologists monitor the job site daily to capture any frogs that enter the site.
Kevin Wiseman, GANDA
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Peregrine falcon (Falco peregrinus)Status: State Endangered
• Nests on Devil’s Promontory near the South Portal.• Caltrans coordinated with the California Department of Fish and Game.• Caltrans is monitoring the pair during the breeding season.
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Nesting birdsStatus: Migratory Bird Treaty Act
• Prior to vegetation clearing, biologists survey the work area for active nests.• If active nests are found, buffer areas are implemented, and clearing is rescheduled until the young have left the nest.
Ross Wilming, GANDA
Anna’s hummingbird
USFWS DLS
American robin
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San Francisco dusky-footed woodrat (Neotoma fuscipes annectans)Status: California Species of Special Concern
• California Department of Fish and Game directed Caltrans to dismantle the woodrat houses located within the project site during the non-breeding season.• Woodrat houses protected within Environmentally Sensitive Areas.