JOB BB0610 WHITE RIVER STR. & APPRS. (F)

NOVEMBER 2, 2016

Question: The Zebra Mussel Containment Special Provision states that the Contractor shall comply with Arkansas Game and Fish Commission (ACFC) Regulation 32.17. This regulation cannot be found on the AGFC website. Answer: The transport of zebra mussels that was covered by AGFC Regulation 32.17 has been moved to Regulation 26.14, which states it is illegal to knowingly transport zebra mussels in Arkansas. The Special Provision will be revised. An addendum has been issued. Question: If the drilled shaft contractor can successfully demonstrate that they can temporarily case the entire shaft length, can the permanent casing requirements be eliminated or lengths reduced? Answer: The permanent casing is required structurally per design for the full length of the drilled shaft. Question: Will the Department allow vibratory method to install all the permanent casings? Answer: The Contractor may use vibratory methods for the installation of the temporary and permanent casing. The Contractor shall provide a detailed explanation for their chosen method of installing the permanent casings in the required Work Plan. The Work Plan shall demonstrate that vibratory installation of the casing will not produce negative effects on nearby infrastructure (newly constructed drilled shafts, the existing bridge, utilities, etc.) or public safety. The submittal should include a plan illustrating the estimated vibrations at various radial distances from the proposed shaft locations as well as a vibration monitoring instrumentation plan. Question: The drilled shaft specification reads in part…”Any excavation for the shaft beyond the lines required by the plans shall be filled with Class S Concrete at the Contractor’s expense.” If

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slurry is utilized, then the annular space between the permanent casing and the excavated wall will likely not be large enough to permit insertions of a tremie pipe for placement of the required Class S Concrete. In this case, is grout a suitable alternative? Answer: The permanent casing is required structurally per design for the full length of the drilled shaft. The contractor shall use shaft and casing installation practices to avoid creating an annular space between the permanent casing and the excavated wall. The slurry method was included to maintain an excavation no greater than the drilled shaft diameter (I.D. of permanent casing) shown in the plans to facilitate the installation of the permanent casing. The Job BB0610 Special Provision Drilled Shaft Foundations has been revised to clarify. An addendum has been issued. Question: Regarding the Special Provision for Drilled Shaft Foundation, Basis of Payment, the specification indicates that the casing material is to be supplied and installed in this item, please clarify what is to be included in the 96”, 120” and 144” casing items. Answer: Permanent casing items include: furnishing and installation of permanent casing, casing details (twisting slots and cutting edges, calculations verifying stress from handling, installation, soil water etc.), field welding, and non-destructive testing of welds (as requested by Engineer). The Job BB0610 Special Provision Drilled Shaft Foundations has been revised to remove permanent casing from under the drilled shaft cost. An addendum has been issued. Question: The conceptual work plan shown in the proposal documents indicates that a 404 permit has been requested for the project based on 9020 cy of material placed to create a 24’ wide temporary roadway. Please clarify if this roadway can be widened to 30’ and if we can place more than the 9020 cy of fill. Answer: Any revision to the conceptual work plan shown in the proposal documents would require a request to amend the permit. This request would require detailed revised drawings. Please refer to Subsection 110.03(c) of the Standard Specifications for additional information. Question: Will the Department provide the copy of the 404 permit?

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Answer: A copy of the 404 permit can be found below, following the questions and answers. Question: Plan Sheets 58-62 detail a “fiber optic cable to be relocated by others.” A site visit indicated this cable has already been relocated. Will the Department please provide documentation describing the new location of the fiber optic cable? Answer: The information can be found below, after the 404 permit.

JOB BB0610

WHITE RIVER STR. & APPRS. (F) JANUARY 13, 2016

Question: This project contains the bid items “SP Slip line pipe (24”), (30”), (36”) and (42”)”. Are the diameters of 24”, 30”, 36” and 42” the diameters of the existing culvert to be slip lined or are these the size pipes needed to slip line the existing culverts? Answer: The sizes are the diameters of the existing culverts to be slip lined. Question: Is slip line the only type of repair or is there an alternative such as cementitious repair or epoxy lining? Answer: The Culvert Rehabilitation Special Provision lists two methods of repair, slip lining and cementitious pipe lining. Epoxy lining is not one of the alternatives. Question: As an alternate to the CJP weld shown for bearing stiffener to girder bottom flange connections, will the Department allow a mill-to-bear condition with a 5/16” fillet weld (Reference the Bearing Stiffener Details on Plan Sheets 120, 141, and 157)? Answer: This substitution is acceptable and shall be shown on the structural steel shop drawings.

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Question: In reference to the Nesting Sites of Migratory Birds Special Provision, please clarify that if the Contractor follows the specified requirements to deter and try to prevent nesting and the birds still are able to construct a nest and work schedule is stopped, will these days be excused from the working day calculation towards project completion? It’s critical to clarify this as even with best efforts and practices sometimes nature prevails and it could be a significant impact to the working day schedule and liquidated damages. During a site visit we noticed several nesting birds under the existing structure so this will be a challenging task to prevent. Answer: The Special Provision allows two options for deterring birds from nesting on bridge structures. If birds do end up nesting, work in that area must stop until the nest is no longer occupied. Time charges will continue. Question: Page 3 of 3 of the Site Use (A+C Method)-Calendar Day Contract Special Provision, clearly describes that a road user fee will be assessed as a penalty to the contractor at a cost of $30,000 for every calendar day in excess, in addition to liquidated damages. Unlike the Early Completion clause where the bonus is maxed out at 75 working days, is there a maximum amount of calendar days that the penalties can be assessed or is it an unlimited amount? Answer: There is not a maximum amount of calendar days for the disincentive. Question: The plate girder elevations at Piers 1 & 2 show locations for Shop Splices in the girder web plates. Will AHTD allow web plate shop splices at other locations, or do the plans show the only allowable shop splice locations? Answer: Superstructure General Notes on Drawing No. 56738 and 58937 states, “Girder webs may be made by shop splicing with a minimum length of 25 feet for section.” Details for welded splices are shown on Drawing No. 56814. Question: Please verify grating material type to be standard ASTM A1011 CS type B and that AASHTO M270, Gr 50W applies to structural steel only and does not apply to the grating.

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Answer: The grating material is not intended to be AASHTO M270, Gr 50W but will be paid for under the item "Structural Steel In Plate Girder Spans (M270, Gr. 50W)". ASTM A-1011A CS Type B is an acceptable material for the grating. Grating material should produce less than a 1/4" deflection under a 100 psf uniform load on a 4' span. AASHTO M270, Gr. 50W applies to the structural steel only. Question: Please confirm that the paint on the existing bridge steel is not lead paint. If unknown a provision for lead paint should be added to the contract to de-lead the bridge steel at the cut lines for demolition. Answer: There is lead paint on the steel. Question: Will implosion be an acceptable method for removal of the existing bridge? Answer: The existing 404 permit does not cover this method. The successful low bidder may submit a request for the Department to apply for an amendment to the 404 permit with the Corps of Engineers. Question: On Page 4 of 5 of the Construction in Special Flood Hazard Areas Special Provision, it appears that the intent of the drawing that a Work platform on Piles is to be constructed just east of Bent 9 in order to access River Pier #1 . It is difficult to determine the extent of the work platform due to details that do not provide information between the river banks. Please clarify that this assumption is accurate and the work platform will be acceptable per the permit. Answer: The work road is intended to provide access to the piers for construction. The “platform on piers” shown on the Conceptual Work Road Plan is intended to allow access to a barge so that Pier #1 can be constructed. The platform on piers is not intended to extend into the channel. The floodplain permit will be valid if the platform does not extend further than what is shown on the plans.

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Question: Does the slip lining material have to meet the AASHTO standard M326? Answer: Please refer to the Culvert Rehabilitation Special Provision. The Special Provision lists the materials that can be used for Alternative 1 and states the Sections in the Standard Specifications that these materials shall be in accordance with. Question: The project contains the SP – Contractor Provided Cultural Resources Clearance for Off-Site Location. The SP states-“The SHPO shall review the cultural resources report for all off-site areas for approval prior to use. The Contractor is cautioned that the initial review of these areas by the SHPO may take 30-90 days”. Additionally the project is being let 1/13/16, with an anticipated start of late Feb/Mar. This time of year is not conducive for work. Given these conditions, would the Department Consider adding the Project SP – “Flexible Start Date”, to allow additional time for pre-construction administrative work? Answer: The Flexible Beginning of Work Special Provision has been added to the Job BB0610. An addendum has been issued. Question: The project requires the use of mechanical couplers, the Splicing Reinforcing Steel Special Provision states 2 types of couplers that are allowable for use on this project, “swaged & threaded”. The Department’s QPL allows the “Screwlock” type coupler. Can the Special Provision be revised to add this type of coupler? Answer: Where the bridge plans allow the use of mechanical couplers, they shall be listed on the QPL. The type is up to the Contractor unless specifically stated in the plans. The last sentence of the first paragraph of the Special Provision states “All butt splicing by couplers not listed on the QPL shall be in accordance with these specifications.” Question: The Special Provisions for Permanent Casing calls for shop welding on the permanent casing to be D1.5 with visual inspection only. Would there be an acceptable alternative using D1.1 shop welding with additional inspection?

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Answer: There is not an acceptable D1.1 alternative. Welding must be per D1.5 Question: In lieu of using dried low-hydrogen E7018 electrodes, can the contractor use flux cored/ semi-auto welding process that still meets the AWS D1.1 specs? Answer: All welding consumables must be low-hydrogen and meet the requirements of AWS D1.5. QPL 807 Welding Materials lists all approved electrodes for both field welding and shop welding applications. Question: Addendum # 2 Revised the Project Special Provision Site Use (A+C Method), Paragraph C from Calendar Days to Working Days. The addendum revised Subsection 108.06 of the Standard Specification to included time from December 21 through March 15, will be assessed against the contract. Regardless of time assessment in this period, the Contractor typically works if the conditions are favorable, including the timeframe for assessment will increase the total “C” days bid and resulting Bid Amount for award consideration. Additionally, during a timeframe with cold temperatures and decreased day light hours, a Contractor may see fit to include site use penalties and may incur increased production costs. Indirectly this change may result in overall higher cost to the Department. Given these conditions, was this the Department’s intent to include this timeframe in assessment of working day charges? Answer: Yes, it is the Department’s intent to include this timeframe in assessment of working day charges. The Contractor should bid the number of working days they need to complete the project. Question: Can the Department provide additional information concerning the flow of the White River? Answer: The hydrographs in the White River plan set can be used to see what stages have actually occurred on the White River since 2008. A summary of average and maximum estimated velocities in the main channel and the left and right overbanks can be found on the last page of this document. Left and Right are looking downstream. Please understand these

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are NOT actual measured velocities, flow rates and elevations; but calculated values based on hydraulic engineering. The hydrographs are from the river gage at DeValls Bluff about 3.4 miles downstream of the I-40 bridge. Additional gage height information can be found at the following link: http://waterdata.usgs.gov/nwis/uv?site_no=07077000 There is another White River gage at Des Arc about 14.5 miles upstream of the I-40 bridge. Gage height information for Des Arc can be found at the following link: http://rivergages.mvr.usace.army.mil/WaterControl/stationinfo2.cfm?sid=WR114&fid=DSCA4&dt

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I-40 OVER WHITE RIVER: HYDRAULICS INFORMATION

EAST WESTRELIEF LEFT LEFT LEFT RIGHT RIGHT RIGHT RELIEF

TOTAL WATER BRIDGE OVERBANK OVERBANK OVERBANK CHANNEL CHANNEL CHANNEL OVERBANK OVERBANK OVERBANK BRIDGEFLOW SURFACE FLOW FLOW AVG. VEL. MAX. VEL. FLOW AVG. VEL. MAX. VEL. FLOW AVG. VEL. MAX. VEL. FLOW

FLOOD (CFS) ELEVATION (CFS) (CFS) (FT/S) (FT/S) (CFS) (FT/S) (FT/S) (CFS) (FT/S) (FT/S) (CFS)

1.01 YEAR 30,150 166.7 0 0 N.A. N.A. 30,150 2.2 2.5 0 N.A. N.A. 0

2-YEAR 75,400 174.8 980 0 0.0 0.0 73,930 4.2 4.8 360 0.2 0.2 130

5-YEAR 115,000 179.0 3,270 400 0.2 0.2 109,210 5.6 6.3 1,540 0.3 0.3 580

10-YEAR 132,000 180.5 4,490 810 0.2 0.2 123,560 6.1 6.9 2,270 0.3 0.4 870

25-YEAR 166,000 183.0 7,090 1,840 0.3 0.3 151,290 7.0 7.9 4,200 0.4 0.5 1580

50-YEAR 195,000 184.9 9,520 2,620 0.3 0.3 174,480 7.8 8.7 6,100 0.5 0.6 2280

100-YEAR 227,000 186.9 12,330 4,190 0.4 0.4 198,930 8.5 9.5 8,410 0.5 0.7 3140

NOTE: LEFT AND RIGHT ARE LOOKING DOWNSTREAM.