3. 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
4. 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
5. 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
6. Scope: Phase one Phase one NE 45th to Northgate Way overpass-express lanes Approximately 10.5 lane miles 3-4 lanes
7. Scope: Phase two Phase two Northgate Way overpass to NE 145thSt- no express lanes Approximately 10.7 lane miles 5-6 lanes
8. 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
9. 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)
10. 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
11. Sequencing: Phase one Crossover to express lanes Extend third lane: express lanes to main line Demolition & Excavation Grading & Paving
12. 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
14. 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
16. 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
17. 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
18. 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
19. Traffic Impacts: Phase one Minimum impact southbound 20.3 mile maximum queue $25 million user cost 25% no show 15% detour
20. Traffic Impacts: Phase two Less impact southbound than phase one 26.4 mile maximum queue $25 million user cost 25% no show 15% detour
21. 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.)
22. 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
25. WMA vs. HMA I-90 WSDOT study near George, WA Less fuel consumed Lower CO2 quantities produced
26. 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
