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Status Update:Diablo Road TrailC I P P r o j e c t C - 0 5 5

P a r k s & L e i s u r e S e r v i c e s C o m m i s s i o n

S e p t e m b e r 1 2 , 2 0 1 8

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Diablo Road Trail A l o n g - te r m v i s i o n to c l o s e a b i c yc l e a n d p e d e st r i a n t ra i l ga p

D a n v i l l e T o w n w i d e T r a i l P l a n ( a d o p t e d 1 9 8 9 ) ,M a p s 2 0 a n d 2 1

Diablo Road

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Diablo Road Trail A l o n g - te r m v i s i o n to c l o s e a b i c yc l e a n d p e d e st r i a n t ra i l ga p

D a n v i l l e T o w n w i d e T r a i l P l a n ( a d o p t e d 1 9 8 9 ) ,M a p s 2 0 a n d 2 1

..

Diablo Road

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Danvil le Bicycle & Trail Network: 1989

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Danvil le Bicycle & Trail Network: 2018

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Danvil le Bicycle & Trail Network: 2018

Trail Gap

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Diablo Road Trail: Conceptual Alignment

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Diablo Road Trail: Conceptual Alignment

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Magee Property: Development Requirements

Diablo Road

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Magee Property: Conceptual Trail Alignment

Q u e st i o n s a b o u t t h e Tra i l :

1 . F u n d i n g ( I s i t a r e a l p r o j e c t ? )

2 . F e a t u r e s ( Wo u l d i t b e p a v e d ? )

3 . F e a s i b i l i t y ( C a n i t b e b u i l t ? )

4 . A l t e r n a t i v e ( W h a t a b o u t b i ke l a n e s ? )

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Magee Property: Conceptual Trail Alignment

Q u e st i o n s a b o u t t h e Tra i l :

1 . F u n d i n g ( I s i t a r e a l p r o j e c t ? ) • A n s w e r : Ye s

2 . F e a t u r e s ( Wo u l d i t b e p a v e d ? )• A n s w e r : Ye s

3 . F e a s i b i l i t y ( C a n i t b e b u i l t ? )• A n s w e r : Ye s

4 . A l t e r n a t i v e ( W h a t a b o u t b i ke l a n e s ? )• A n s w e r : A n a l y s i s c o m p l e t e d

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Feasibil ity Analysis

A s s e s s m e nt o f O p t i o n s :

1 . R o a d C r o s s i n g s

2 . D r a i n a g e C r o s s i n g s

3 . H i l l A l i g n m e n t s

E st i m ate o f C o st s

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Roadway Crossing Options

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Drainage Crossing Options

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Hill Alignment Options

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Diablo Road Trail: Feasibil ity Study Summary

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Analysis: Diablo Road Widening for Bike Lanes

Diablo Road

Project Limits: Diablo Road, Green Valley Road to Mt. Diablo Scenic

Distance: 1.35 miles

In-House Assessment:

1. Road configuration (What would it look like)

2. Potential Impacts (Environmental and fiscal)

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42-Foot Roadway Cross Section provides for:

• Two 12-foot travel lanes

• Two 5-foot bike lanes

• Two (2-ft and 3-ft) shoulders

• One 3-foot drainage swale

Lane and shoulder widths consistent with current AASHTO standards

Analysis: Diablo Road Widening for Bike Lanes

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“As the gateway to Mount Diablo State Park, Diablo Road itself is an

important scenic corridor … [and] retains the character of a country

road. The Town strongly supports retention of this character and

protection of the views and vista from the road.”

- Danville 2030 General Plan

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• Removal of 341 Oak trees

• Grading of 61,000+ cubic yards of soil

• Constructing ~5,450 linear feet of retaining walls, ranging from 3-17 feet high

• Realigning Green Valley Creek

• Relocating 47 utility poles and all fire hydrants

• Temporary one-lane travel on Diablo Road during 18-24 month construction period

E nv i ro n m e nta l I m p a c t i n c l u d e

Analysis: Diablo Road Widening for Bike Lanes (cont ’d)

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Project Component

Source: 2017 Contract Cost Data, California Department of Transportation

Estimated Cost

Project DesignEngineering, surveys, geotechnical services, environmental permits

$8,100,000

Site Preparation • Site mobilization and traffic control: $7,000,000• Tree removal (341 Oak trees): $1,705,000• Removal of fences, road rail, retaining walls, drainage systems, etc. $1,863,000• Clearing and grubbing: $3,500,000• Utility relocation (47 poles; all fire hydrants): $6,500,000• Culvert crossing and creek realignment: $2,950,000• Miscellaneous administrative: $240,000

$23,758,000

Construction $15,751,074

Contingency (15%) $7,141,361

Estimated Total (Design & Construction): $54,750,435

Analysis: Diablo Road Widening for Bike Lanes

C o m p a r i s o n : I - 6 8 0 A u x i l i a r y L a n e s , S e g m e n t 2 = A p p r o x . $ 3 4 m i l l i o n

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Diablo Road Trail (CIP Project C -055)

• Accept informational status update

• Provide conceptual feedback

Re co m m e n d at i o n

Q u e st i o n s ?