devil’s slide coastal trail improvements project · today’s presentation of 90% drawings will...

Devil’s Slide Coastal Trail Improvements ProjectCounty of San Mateo

Devil’s Slide Coastal Trail Improvements Project

Project History

Measure T Nov.1996

Plans and Permits

Task Force meetings

Hired a team

Board support

Budget


Project Overview


Programming and Linkages

Park hours

Multi use trail

Pedestrians

Equestrian

Bicycle

Dogs on leash

Future trail linkages

Caltrans parking lot


Public Comment Process

Received comments in the following topic areas on 30% drawings

Programming and trail linkages

Paving surface durability and safety

Equestrian access

K-rail improvements

Trail safety

Bird protection fencing aesthetics

Today’s presentation of 90% drawings will attempt to address these comments


Next Steps

Transfer title to County (August 2013)

Board of Supervisors approval (October 1st)

Construction (Winter 2013/ 2014)

Trail opening (March 2014)


Presentation Overview

Pavement, Striping, Signage & K-rail, and Other Improvements

Environmental Review & Overlooks

Maintenance, Schedule & Next Steps

Questions

Roland Haga, P.E, LEED AP

BKF Engineers

Sarah Sutton, ASLA, LEED AP,

The Planning Center | DC&E

Gary LockmanCounty of San Mateo

Project Team


Overview of Trail Improvements

1.3 Mile Trail

Paving and Striping

Signage/Interpretation

Accessibility

Accessibility

K-Rail Improvements

Overlooks


Paving/ Striping

6’ bike lanes each way

10-12’ pedestrian/ equestrian

Repair and resurface existing asphalt pavement (microsurfacing)


Before K-Rail simulation


Microsurfacing

Prevents pavement degradation- seals underlying surface from water and air intrusion

More skid resistant than slurry (micro 0.8 vs. slurry 0.5 friction coefficient)

Longer lifespan than slurry (5-7 years vs. 3-5 years)

Widely used throughout Bay Area and California


Paving and Striping


User Safety

Signage

Speed limit paint on trail pavement and posted on each end

Horse signs posted at each trailhead

K-rails and cable fencing keeping people back from cliff edge

2’ buffer between bike lane and K-rail

Ambassadors- verbal warnings


Signage

Remove existing roadway signage

New regulatory signage (minimize number, and location to protect views)

Interpretive panels


Accessibility Improvements

Bathroom & drinking fountains (north and south trailheads)

Interpretive panels

Overlooks

Observation scopes

ADA access provided to overlooks from parking per County trail standards


K-Rail Improvements

Moving K-rail for smooth trail edge

Removing limited K-rail to expose old rock wall

Power wash and paint tan

Clear debris and weeds along K-rail

Future opportunities artistic teaming/ fundraising


Environmental Review

May 2002 EIS/EIR supplement to 1986 certified by Caltrans

Sept. 2004 California Coastal Commission upheld July 2004 approved CDP

Trail improvements are consistent with CDP

Project will provide memorandum including detailed analysis of biological resources


Potential Wetlands

Four potential Wetlands

Two require K-rail relocation

Supervision of a qualified wetland biologist


Bird Nesting Protection

Trail is directly adjacent to important bird nesting locations

Birds are acclimated to vehicular traffic only

Views of pedestrians may cause nests to be abandoned

Bird nest protection is critical

philseu.blogspot.com/2011/

Bird species include: Peregrine Falcon, Murres, Brandt’s, Pelagic Cormorants, Western Gulls, Pigeon Guillemots, Brown Pelicans



2011 Common Murre Report recommends visual barrier

Nesting season January-September

Year round fencing option is preferred

Sensitive Nests/

Breeding Areas

Visual Barrier


Bird Nesting Protection Movable blinds- view &

maintenance concerns, not required due to line of sight

6’ Chain-link fencing-aesthetic concerns

Clear fencing-maintenance concerns

Cable fencing- climbing concerns

Preferred Option- 4’ Tall mesh with vegetation behind

sierrafencetx.com

www.yaboofence.com

www.crl-arch.com


Bird Nesting

Similar fence example showing transparency


Bird Nesting Protection 4’ tall mesh fencing

Durable vandal proof wire

Small mesh openings and top spikes difficult to climb

See-through transparent panels

Galvanized steel with black powder coating finish 10 year warranty

4’ Omega Secur Fence


Before photo of trail


After photo simulation of trail (BKF)


Bunker

Historic value

Site protection fencing

6’ high mesh fencing and gate


Northern Overlook


Northern Overlook

Plan view color


Northern Overlook

Plan view color

Added 2 benches and included in wall design

Similar approach


Northern Overlook

Replaced chain-link with relocated K-rail for aesthetics


Northern Overlook


Material Palette


Interpretive Area


Interpretive Area

Plan color


Interpretive Area

Plan color

Added 3 benches

Added 1 interpretive sign


Interpretive Area

Section color


Interpretive Area


Southern Overlook


Southern Overlook

Plan color


Southern Overlook

Plan color

Moved observation scopes

Added 2 interpretive signs


Southern Overlook


Future Maintenance

Bird monitoring

Wetland monitoring

Pampas grass removal

Rock removal

Rock slide repair (funding and expectations)


Questions/ Comments Gary LockmanCounty of San Mateo

Roland Haga, P.E, LEED AP BKF Engineers

Sarah Sutton, ASLA, LEED AP, The Planning Center | DC&E

Devil’s Slide Coastal Trail Improvements ProjectCounty of San Mateo

devil’s slide coastal trail improvements project · today’s presentation of 90% drawings will...

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