grade separation alternative a feasibility analysis of the reconfiguration of genesee avenue at...
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![Page 1: Grade Separation Alternative A Feasibility Analysis of the Reconfiguration of Genesee Avenue at Governor Drive By: Daniel Aruta, P.E](https://reader035.vdocument.in/reader035/viewer/2022062619/55165af6550346a2698b4f83/html5/thumbnails/1.jpg)
Grade Separation Alternative
A Feasibility Analysis of the Reconfiguration of Genesee Avenue at Governor Drive
By: Daniel Aruta, P.E.
![Page 2: Grade Separation Alternative A Feasibility Analysis of the Reconfiguration of Genesee Avenue at Governor Drive By: Daniel Aruta, P.E](https://reader035.vdocument.in/reader035/viewer/2022062619/55165af6550346a2698b4f83/html5/thumbnails/2.jpg)
Topics for Discussion:• What is a Grade Separation?
• Construction Impacts
• Traffic Analysis
• Environmental Impacts
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PART 1: What is a Grade Separation?• A facility which provides a physical vertical separation between two
roadways crossing each other to alleviate traffic congestion and promote safety
• One roadway passes over another crossing roadway, and both roadways do not meet
• The upper roadway crosses over the lower roadway via a bridge
• Similar to a diamond interchange on a freeway
• A Grade Separation is not a tunnel!
University Avenue in Park Slope
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Sample of a Grade SeparationDiamond Interchange of Interstate 15 at El Cajon Blvd in San Diego
Interstate-15
El Cajon Blvd
Off
Ram
p
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5 Basic Elements of a Grade SeparationInterstate 15 at El Cajon Blvd in San Diego
Retaining Wall
Bridge
RetainingWall
DepressedRoadway
Ramp
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5 Basic Elements of a Grade SeparationInterstate 15 at El Cajon Blvd in San Diego
BridgeRetaining
Wall
RetainingWall
DepressedRoadway
Ramp
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Genesee Ave Grade Separation at Governor Dr• Bridge on Governor Dr passes over Genesee Ave below• 2 Lanes on Genesee Ave are depressed to pass under the bridge• 4 Ramps• Inside Retaining Walls (4 each)• Outside Retaining Walls (minimum of 4 each)• Total Length from end to end = 1,787 ft.
Plan View
No
rth
Bridge
Inside Retaining Wall
Outside Retaining Wall
Depressed Roadway
Begin Walls Begin Walls
Ramp
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Vertical Separation• Governor Dr above Genesee Ave• 2 inside lanes of Genesee Ave below Governor Dr• A bridge over a depressed roadway
Vertical Profile View
GovernorDrive
Genesee
Avenue
Depressed Roadway
Vertical Scale is Exaggerated!
Begin Grade Separation End Grade Separation
Existing Roadway
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Section Through Bridge
• Length of Bridge (Span) = > 50 ft.• Width of Bridge = ± 110 ft.
Section where Genesee Ave passes under the bridge at Governor Dr
Section View
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Section Through Retaining Walls
Section View
Section of Genesee Ave north and south of Governor Dr (beyond bridge)
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Lengths of Retaining Walls
• South of Governor Dr: 731 ft. long, max height greater than16.5 ft.
• North of Governor Dr: 936 ft. long, max height greater than16.5 ft.
Inside Retaining Walls:
Plan View
731’ 936’
No
rth
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Part 2: Construction Impacts• Utility Relocation
• Constructing the Bridge
• Constructing the Retaining Walls
• Road Closures
• Environmental Impacts
• Project Duration
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Utility Relocation• Two 16” Water Mains• 8” Sewer• Electrical Duct Bank• Gas Line• Phone Cables
N
Water
Wate
r
Sewer
Elect
Gas
Phone
Phone
Genesee Ave
Go
vern
or
Dr
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Constructing the Bridge• Drive Sheet Piling into the Ground
Section View
Sheet Piling
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Constructing the Bridge• Drive Sheet Piling into the Ground
• Excavate Pit for the Bridge
Section View
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Constructing the Bridge• Drive Sheet Piling into the Ground
• Excavate Pit for the Bridge
• Construct the Bridge
Section View
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Constructing the Retaining Walls• Drive Sheet Piling into the Ground
• Excavate Channel
• Construct Inside Retaining Walls and Depressed Roadway
• Construct Outside Retaining Walls for Sideslopes and Outside Roadways
Section View
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Extent of Sheet Piling in Genesee Ave
Plan View
No
rth
Sheet Piling
Depressed Roadway
For Depressed Roadway: Approx. 1,100 ft. each side of depressed roadFor Outer Retaining Walls: Lengths will vary
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Environmental Impacts to Consider During Construction
• Noise
• Vibration
• Air Quality
• Truck Trips
• Contaminated Soils
• Backup Bells on Construction Equipment
• Driving Sheet Piling
• Diesel Exhaust from Construction Equipment
• Thousands of Truck Trips
• Soils Mitigation from 4 Gas Stations – Project Delay
Impact
Example
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Project Duration• Utility Relocation = 6± months
• Mitigation of Contaminated Soils = ?
• Construction of Grade Separation = 2± years
• Total Project Duration = 2.5+ years
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Road Closures during Construction
• Genesee Ave from Radcliff La to south of University City HS
• Intersection of Governor Dr and Genesee Ave
Plan View
1,800 ft.
No
rth
• Disruption to Vehicular and Pedestrian Traffic• Loss of Access to Schools and Businesses• Economic Hardship on Local Businesses• Huge Detriment to the Community
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North/South Access during Construction• No Bridge on Regents Rd
• 1,800 ft. of Genesee Ave closed
• Intersection of Governor Dr and Genesee Ave closed
Police, Fire andParamedic Serviceto University City
will be severelychallenged
during construction
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Alternate Routes during Construction• Interstate 5 Freeway
• Interstate 805 Freeway
• State Route 52
Detour!
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Part 3: Traffic Analysis – Post Construction• Existing Traffic Movements at Intersection of Genesee & Governor
• Proposed Traffic Movements at Intersection of Genesee & Governor
• Level of Service and Lane Reductions at Split Points
• Elimination of Bus Stops
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Existing N-S Traffic Lanes at Intersection• 2 Southbound Through Lanes• 2 Left Turns – SB Genesee to EB Governor• 1 Southbound Right Turn• 2 Northbound Through Lanes• 1 Left Turn – NB Genesee to WB Governor• 1 Northbound Right Turn
Existing Intersection
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Proposed N-S Traffic Lanes at Intersection• 1 Southbound Combined Through/Right Turn Lane• 1 Left Turn – SB Genesee to EB Governor• 1 Northbound Combined Through/Right Turn Lane• 1 Left Turn – NB Genesee to WB Governor
Grade Separation
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UC Golden Says:
…and…
Do The Math:
NB: 78% of 33,000 = 25,740 ADTSB: 70% of 33,000 = 23,100 ADT
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Street Classification and Level of Service (LOS)• Level of Service “E” = 10,000 ADT for 1 Lane• NB Traffic: 25,740 ADT > 10,000 ADT• SB Traffic: 23,100 ADT > 10,000 ADT
NB: 2.57 x Failure Volume
SB: 2.31 x Failure Volume
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Lane Reduction at Split PointDecision: Do I take the underpass or do I take the ramp to Governor Dr?
Split Point
1 T
hro
ug
h L
ane
Ram
p to Governor D
r“Governor Dr ”
As most cars from two lanes vie for position into one lane, this will effectively create a “lane reduction” at the split point and traffic will backup!
UC Golden:
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3 Bus Stops on Genesee Ave are Eliminated
Post Construction
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Part 4: Environmental Impacts – Post Const.• Noise
• Neighborhood Character
• Tree Removal
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Noise• Sound acoustics are accentuated off retaining walls
• Increase in traffic volumes over time due to urban growth will increase ambient noise levels
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Neighborhood Character• University City is a residential community
• Only small retail except for commercial district on Greenwich Dr
• UC is not a major traffic generator like Golden Triangle
• Grade Separation will “urbanizes” the character of the neighborhood
Should future University City appear like this?
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Tree Removal• 88 Conifer Trees
• 22 Eucalyptus Trees
• 5 Sycamore Trees
• 3 Others
118 trees will be removed
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The End