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Interstate 5:NE 45th to NE 145th
Full Depth HMA Reconstruction
Location
• Location
• Interstate 5 Northbound Lanes from North 45th
Street to North 145th Street
Overview
• Location
• Interstate 5 Northbound Lanes from North 45th Street to North 145th Street
• Task
• Remove Current PCC Slabs
• Replace PCC with HMA
• Goals
• Reduce Cost
• Reduce Traffic Impacts
• Create a long lasting Sustainable Pavement
Existing Conditions
• Current Condition is Poor to Very Poor
• Built in the Early 1960s with a Design Life of 20 Years
• 9-inch thick PCC panels that are 15ft in length by 12 ft in width
• 11ft Lanes
• Extensive Panel Cracking and Faulting of Traverse Joints
• Extensive Wheel Path Wear and Pavement Surface Polishing
• Uncomfortable for Users
• Verge of not being able to Serve Traffic
Overall Scope
• I-5 Northbound
• NE 45th St to NE 145th St
• Remove 9” PCC and Replace with 13” HMA and 9” base
• Two Phases
• 5.2 miles at 21.2 lane miles total
Scope: Phase one
• Phase one
• NE 45th to Northgate Way overpass-express lanes
• Approximately 10.5 lane miles
• 3-4 lanes
Scope: Phase two
• Phase two
• Northgate Way overpass to NE 145th St- no express lanes
• Approximately 10.7 lane miles
• 5-6 lanes
Cost
• Construction (CA4PRS)
• Construction Costs: $12,700,000
• Roadway Costs: $16,000,000
• Supporting Costs: $300,000
• Total Cost: $29,000,000
• Agency (Real Cost)
• Life Cycle Agency Costs will be $25,000,000
• LCCA (Real Cost)
• Life Cycle User Costs will be $16,000,000
Construction Time
• Phase 1
• Begin on July 17th (After Independence Day)
• Continuous Closure
• Maximum Closure of 2 weeks
• Phase 2
• Begin on August 7th
• Continuous Closure
• Maximum Closure of 2 weeks (Finish before Labor Day)
Construction
• Maintain three lanes of traffic at all times
• Allow one lane for equipment and trucks to passing at all times
• Excavate and replace with crushed aggregate quickly
Sequencing: Phase one
• Crossover to express lanes
• Extend third lane: express lanes to main line
• Demolition & Excavation
• Grading & Paving
Sequencing: Phase two
• Remove crossover to express lanes
• Remove third lane: express lanes to main line
• Left three lane then right lanes
• Demolition & Excavation
• Grading & Paving
Equipment
HMA Plant Location
• ICON Materials will be contracted to supply HMA and aggregate from their Auburn Aggregate Resource and Asphalt Plant located in Auburn WA
• Plant Produces 500 tons/hr when aggregate is wet and 600 tons/hr when the aggregate is dry
• Average trucking time from the plant to site is 40 minutes during normal conditions and 70 minutes during heavy traffic
Demolition Materials
Productivity
• Phase 1
• Using 87% confidence interval productivity will be 6.55 lane miles per 7 day closure
• Requires two 7 day closures
• HMA trucks are greatest limit to productivity
• Phase 2
• Using 87% confidence interval productivity will be 6.50 lane miles per 7 day closure
• Requires two 7 day closures
• HMA trucks are greatest limit to productivity
Closures
• Phase 1 (45th St. to Northgate Way)
• Closes Friday July 17th 2015 at 11pm
• Must reopen by Monday August 2nd 2015 at 4am
• Phase 2 (Northgate Way to 145th St.)
• Closes Friday August 7th 2015 at 11pm
• Must reopen by Monday August 24th 2015 at 4am
Alternative Routes• SR-99
• Aurora
• SR-522 • Lake City/Bothell Way NE
• 15th Ave NE
• 11th/12th Ave NE
• 25th Ave NE
• Phinney/Greenwood Ave N
Traffic Impacts: Phase one
• Minimum impact southbound
• 20.3 mile maximum queue
• $25 million user cost
• 25% no show
• 15% detour
Traffic Impacts: Phase two
• Less impact southbound than phase one
• 26.4 mile maximum queue
• $25 million user cost
• 25% no show
• 15% detour
Critical Resources
• HMA Plant
• Plant is producing maximum capacity to provide for this project
• HMA Hauling Trucks
• High Spearman Correlation Coefficient
• Dependent upon plant production
• Travel (coffee stops, traffic, etc.)
Backup Plans
• The Seattle Asphalt Plant owned by ICON Materials will be on standby incase the main plant faults
• Located in the South Park neighborhood of South Seattle
• Produces 250 tons/hr when aggregate is wet and 300 tons/hr when aggregate is dry
• Average trucking time from this plant to the site is estimated to be 18 minutes in normal conditions and 30 minutes in heavy traffic
• Extra equipment such as pavers, buggies, rollers and dump trucks will be stored at the temporary storage facilities
Public Awareness
Potential Cost Savings
• Warm Mix Asphalt (WMA)
• Recycled Concrete
WMA vs. HMA
• I-90 WSDOT study near George, WA
• Less fuel consumed
• Lower CO2 quantities produced
Near Site Recycled Concrete
• Cost Savings
• Savings of $5 to $10 per ton
• $316,400 to $632,800 for the project
• Environmental Savings
• Less aggregate
• Less CO2
• Blah
