Transcription

1

2

3

4

5

6 Click to edit Master title style CSAH 61 (0904) Pre-Bid Meeting Transportation Department, Jason Staebell, PE Hennepin County 1

7 CSAH 61 (0904) PreBid Meeting Agenda Project Team Introductions Project Overview Schedule Diversity and Inclusion Requirements Staging Bridges and Retaining Walls Geotechnical Environmental (Permits, Wetlands, USFWS) Utilities Hennepin County Project Team Introductions Jason Staebell, PE Design Project Manager Wayne Loos Bidding Contact Dan Allmaras, PE Construction Project Manager Josh Potter, PE Design Engineer Mike Speedling, PE Bridge and Wall Consultant Brad McCarter, PE Geotechnical Consultant Mike Kuchaes Lead Design Technician Darin Mielke, PE Asst. Carver County Engineer Hennepin County 2

8 Project Location Proposed Project Reconstruct Flying Cloud Drive (CSAH 61) from Highway 101 in Chanhassen to Charlson Road in Eden Prairie (3.7 Miles) Construction includes: Two-lane roadway with shoulders and Continuous shared center left-turn lane Urbanize roadway (add concrete curb and gutter) Multi-use trail on north side of roadway Geotechnical Embankments Raise roadway out of 100 year flood plain Nine retaining walls Three bridges (10J43, 27C01 and 27C02) Intersection improvements Storm water quality improvements 3

9 Schedule Bid opening: November 7, 2017 Contract Award (Anticipated): 60 Days after Bid Opening Start of Phase 1 (Anticipated): February 2018 CSAH 61 open to all through traffic: December 2019 All work expect final clean up on or before June 30, 2020 Critical Path Method (CPM) Progress Schedules required see (1803) Diversity and Inclusion Requirements Affirmative Action Plan (AA Plan) Goal: Minority (skilled and unskilled combined): 32.0% Women (skilled and unskilled combined): 6.0% Small Business Enterprise (SBE) Goal 25%. Goal will be updated to 25% via Addendum Workforce Entry Program (WEP) Goal: 14,642 hours See Division A of the proposal for additional details 4

10 Staging Phase 1A: Full closure allowed of CSAH 61 between Charlson Road and Spring Road. Maximum closure allowed 8 months Phase 1B: Work between Spring Road and Hwy 101 that does not involved lane closures in that segment Phase 2: Full closure allowed of CSAH 61 between Spring Road and Hwy 101. Maximum closure allowed 14 months. Road must be reopened in Phase 1A before Phase 2 closure is allowed to start Local access required to remain open during road closure Project Coordination City of Eden Prairie led project for relocation of Eden Prairie Road. Reconstruction and relocation of Eden Prairie Road Includes pump station construction near Lions Tap 5

11 Bridges and Retaining Walls Bridge 10J43 Precast 16x4 Box Culvert Remove and replace existing culvert MnDOT Standard 110 feet in length Gabion wall Riprap (Inlet, Outlet and Inside) Sequence Construction to avoid high flow periods 6

12 Bridge 27C feet of bridge crossing poor soils Precast girder spans and slab spans Units 1 and 2: foot slab spans Units 3, 4, 5 and 6: prestressed girder spans (MN54) 3YHPC-M monolithic deck Separate pay items for elevated and atgrade Stainless steel deck drains B705 Modified (offset drain for elevated prestressed spans) Type Special (buried DIP for at-grade slab spans) Pile bent piers Driveway entrance on bridge Functions similar to approach panel Bridge 27C02 Riley Creek Crossing Replace concrete box culvert Single span precast girder bridge Pile supported abutments 22 foot wide sidewalk Extensive matrix riprap Includes sheet pile weir on north side (upstream) of bridge 7

13 Retaining Walls 7 Anchored Soldier Pile Walls Wall lengths range from 332 to 1070 feet Wall heights range from 4 to 32 feet Steep retained slopes 2 CIP MnDOT Standard Cantilever Walls Wall lengths range from 99 to 763 Wall heights range from 13 to 19 feet MnDOT Standard Walls Wall WG Adjacent to Riley Creek Bridge 99 feet long Pile Supported Concrete formliner texture and multicolor surface treatment Wall WJ South of CSAH feet long Pile Supported Concrete formliner texture and multicolor surface treatment 8

14 Anchored Walls HP soldier pile Temporary timber lagging Permanent ground anchors (tie-backs) CIP Concrete Facing with formliner texture and multicolor surface treatment Plan tabulations of Geometry, Pile Data and Anchor Data Note qualification requirements in Special Provision Permanent Ground Anchors Contractor designed anchors to resist FDL tabulated on the drawings Thru Pile Anchor No Wales 1 to 4 levels of anchors Incremental excavation and anchor stressing Designed for 4-6 utility excavation in front of completed wall Active Zone defined on Sheet W-19 Temporary bracing may be required during anchor stressing 9

15 Typical Anchored Wall Section Top-down Construction Soldier H-pile sections installed Wood or pre-cast lagging between piles Grouted Tie-backs embedded into bluff, up to 70 foot subsurface permanent easement allowance Cast-in-place panels for finished facing Example of Soldier Pile Wall 10

16 Sample Details Anchored Walls 11

17 Typical Geologic Cross-Section Steep Bluffs to the north composed of Glacial Till and Alluvial soils, typically granular materials, fine-grained sand with silt seams. Floodplain to the south composed of floodplain alluvium, typically mixed organic soils and shallow groundwater. Artesian groundwater conditions in areas created by inconsistent confining layer, encountered near RTA Park Highly variable subsurface conditions and shallow groundwater south of road Typical Roadway Cross-Section Earthwork cuts to north and fills to the south to reach finished grades 100-year flood at elevation721 feet MSL Right-of-way Constraints (private on north/us Fish and Wildlife on the south) 12

18 Primary Geotechnical Considerations Minimize ROW impacts to the south by avoiding excavations (i.e., soil corrections) into poor soils with shallow groundwater that could create instability. to the north by constructing soldier pile and lagging walls (i.e., top down construction). Controlling settlement of new embankments floated over poor soils with surcharging. Maintaining stability of new embankments especially during rapid drawdown following flood events with geosynthetic materials (geo-grid/slope armor). A land bridge will be constructed along the alignment near the RTA park where settlement and stability cannot be controlled with embankment approach. Sands excavated from north hillsides will generally be used to construct widened embankments. Some import is anticipated. Typical New Embankment Section Base Geo-fabric and base fill over undisturbed subgrade (no soil correction excavations). Geo-grid reinforcement used to construct widened embankment. Surcharging the new embankment to reduce secondary consolidation. Staged (2-3 week delay) construction of new embankments needed for stability. Owner to monitor settlement Protection with slope armor below 100-year flood plain 13

19 Example of Slope Armored Embankment Environmental Permits (1702): U.S. Army Corp of Engineers (USACE) United States Fish and Wildlife Service (USFWS)* Minnesota Pollution Control Agency (MPCA) Riley Purgatory Bluff Creek Watershed District Lower Minnesota Watershed District Minnesota Department of Natural Resources (DNR) Federal Aviation Administration (FAA) City of Eden Prairie and City of Chanhassen See special provisions for renewal and update requirements of permits by the contractor Wetlands (1701): Temporary wetland impacts allowed with approval for up to calendar 180 days. See special provisions for additional requirements Cultural Resources (1701): Extensive data recovery already done. However strict requirements for inadvertent discoveries as described in the special provisions and USACE & USFWS permits. * Permit holder and land owner in corridor 14

20 Utilities (1507) Minnesota Valley Electric Cooperative CenturyLink (National) CenturyLink (Local) Comcast Level 3 Communications Xcel Energy Questions Hennepin County 15

21 Wayne Loos Transportation Design 1600 Prairie Drive Medina, MN Hennepin County 16