St. Croix River CrossingS.P. 8221-82045

Contractor Informational MeetingMay 15, 2013

Contact: Paul Kivisto, P.E.St. Croix Crossing Bridge Construction Engineer

paul.kivisto@state.mn.us

The contract will be the governing document and anything we say here is to help contractors understand the draft plans and clarify items that may be in the contract. If there is a conflict between what is presented and the final plans and specifications the plans and specifications will prevail.

Bridge Plan and Elevation

Bridge 82045 – River Spans

• Extradosed with 5 towers• 3360 feet in length• Precast segments 18’ deep– Twin three cell boxes with longitudinal closure

• Piers constructed to 15’ above normal pool as part of early foundation contract

Br. 82045 Major Components

• Concrete box segments– Approximately 600 segments (twin segments)– Max weight about 150 to 180 tons

• Five towers– Variable height - 200 to 230 feet above water– Towers 67’ above deck – Wisconsin slope pier – 100 ft tall

• Drilled Shafts, Footings, Pier Starters already constructed

Typical River Span

600’

Main Span Cross SectionVaries 102’-5” to 98’-6” out to out

Closure Pour

100’ +/-’ +/-

18’

Closure Pour

82045 – Approach Spans

• Precast concrete box superstructure• Alignment separated• 1600 feet in length• Vary in depth from 18 to 10 feet• Gore area is complex, cast-in-place on

falsework• H-pile foundations

Ramps 82047 and 82048

• Concrete box superstructure• On ramp will be cast in place on falsework• Off ramp designed as precast segmental• Vary in depth from 14 to 10 feet• H-pile foundations

Environmental Constraints

• Wetlands on Minnesota Approach• Forested Wetlands near Minnesota bank• St. Croix River• Wisconsin Bluff• Commitments made to minimize impacts and to

preserve water quality• Remove Xcel Barge Unloader Facility

Wetland Minnesota Approach

Minnesota ShorelineForested Wetland

Minnesota Approach

ForestedWetland

Wetland

Wisconsin Bluff

• Last pier is similar to MN side– Smaller footing

• Precast segments, 18 ft deep• 275 ft box girder end span• Minimize impact to bluff,

especially near river• 24” CIP steel shell piles• Access from abutment

Wisconsin Bluff

Reference Information Documents (RID)

• ftp://ftp2.dot.state.mn.us/pub/outbound/StCroix• Geotech Information, Construction Options,

Wisconsin Bluff, Cross Beam• Other information including permits are on other

folders in same directory• Information provided will not be contractual

(1301) BEST VALUE METHOD(Pre-qualification)

• Technical Proposals will be due approximately 4 weeks after advertisement

• Some of the following may be pre-qualified• Experience of Personnel (1 or more)– Project Manager– Environmental Compliance Officer– Structures Superintendent (Precast Segmental)– Casting Yard Engineer/Superintendent– Superstructure Construction Engineer– Quality Control Manager

(1511) Inspection of Work

• Implementing Critical Activity Hold Points– Environmental Reviews– Casting segments: geometry, rebar, ducts– Cross beam construction: geometry, rebar, ducts– Tower construction: anchor box placement– Cast-in-place boxes: geometry, rebar, ducts

(1701) Environmental Program Delivery

• Environmental Training– Required for all personnel on site

• Contractor shall have an Environmental Compliance Officer– Ensure all permits are adhered to

(1803) CPM Schedule

• Contractor will access and update MnDOT Enterprise Project Management System (EPMS) P6 software

• Schedule to be cost and resource loaded• Will need to tie to 4D Synchro model– Contractor must maintain links for all activities

(1803) Prosecution of Work• Haul roads not permitted in environmentally sensitive

areas• Access sites include the Xcel Energy ramp and

underneath the bridge. No agreements or permits have been obtained for other areas.

• MnDOT may consider keeping Stillwater Barge Facility Access, but no agreement with City.

• No permits have been obtained for Wisconsin shore access

• Trestle under bridge part of COE permit

Trestle from Minnesota shore

• Allowed as contractor option to minimize wetland impacts

(1806) Contract Time

• All work completed by November, 2016.• Piers 8, 9, and 12 early foundations will be ready

by Dec 20, 2013. • Piers 10 and 11 early foundations will be ready

by April 30, 2014.

Mass Concrete

• Will be included on pier blades, crossbeams, some pier segments, towers, pier columns,

• Will include maximum temperature and temperature differential

Concrete Properties

• Contractor mix design – Require testing as detailed in specs

• 4,000 psi concrete strength in approach substructures.

• 6,000 psi to 9,000 psi in segments – 9,000 psi is at 180 days

• 8,000 psi in crossbeams• 7,000 – 8,000 psi in pier blades and towers

Payment Items

• Construct Access Facilities (MN and WI) __LS• Foundation Prep (all piers) __LS• Box Girders– Structural Concrete CIP Box __CY– Structural Concrete Extradosed __SF– Rebar (60 and 75 ksi) ___LBS– Post Tensioning (longitudinal, transverse, & bars) __LB– Surface Finish __SF

Payment Items

• Cable Stay System __LS• Precast Segmental Construction __LS• Segmental Erection Equipment (Extrados) __LS• Cable Vibration Testing __LS

Questions Questions or comments related to the project can be directed to Paul Kivisto and will be considered in final development of the plans and specifications.paul.kivisto@state.mn.us

Thanks for your interest!Paul Kivisto, P.E.St. Croix Crossing Bridge Construction Engineerpaul.kivisto@state.mn.us(651) 366-4306 office (651) 470-9862 cell

ftp site: ftp://ftp2.dot.state.mn.us/pub/outbound/StCroixProject web site: http://www.dot.state.mn.us/stcroixcrossing/