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Order Number UPC State Project Number Last Date to Post Questions
C10 113759 (NFO) 0077-098-828, B653, B654, C501 6/19/2020
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Subject: Temporary Lane Closure - Stage 1 Type: Plan
Question Date: 5/20/2020 10:40:49 AM
Sheet 1H(1A) indicates that Stage I widening the outside shoulder of the SBL is to be performed under short term closure which are defined as 9:00 PM- 6:00AM. This work involves installing temporary traffic control, removing existing guardrail, milling pavement, excavating to subgrade, placing 6” of No. 21B, placing two - 3” lifts of BM-25.0A followed by 2” of SM-12.5E, installing temporary barrier, and removing temporary traffic before reopening the lane. Also note, that each lift of asphalt must cool prior to placing next lift. This amount of work is not possible to perform in 9 hours as it will require several days to complete. Will longer closures be allowed? If so, how long?  
Answer   Date: 5/20/2020 2:23:21 PM
Any change in documented working hours would have to be approved by the Bristol District Traffic Division.  
 
Subject: ESC Type: Plan
Question Date: 5/19/2020 6:01:49 PM
Can EC-16 check dams be utilized in lieu of EC-4 check dams?  
Answer   Date: 5/20/2020 2:19:33 PM
All of the check dams are temporary, so EC-16 dams can be substituted for EC-4 dams as long as the notes in the standards and the VDOT specifications for the EC-16 dams are observed.  
 
Subject: Grading/MSE Type: Plan
Question Date: 5/19/2020 12:24:18 PM
Will all of the excavation and unreinforced fill for the MSE walls be paid by roadway excavation? Will the unreinforced fill be paid as borrow? Sheet 68 of the Bridge Plans state that the unreinforced fill will be paid through roadway excavation. The roadway plans make no differentiation between MSE excavation or backfill.  
Answer   Date: 5/21/2020 11:11:11 AM
The excavation for the unreinforced fill will be paid for as roadway excavation and the unreinforced fill will be paid as borrow. The roadway plans make no differentiation between MSE excavation or backfill as it is all a part of the roadway excavation and borrow.  
 
Subject: Grading Type: Plan
Question Date: 5/19/2020 12:21:32 PM
The cross sections and the grading diagrams do not appear to correlate. The most obvious is Stage 4. Can you please confirm Stage 4 Grading Diagram is only for the west side of the South Bound lanes? Similarly for the other diagrams, do they accurate correspond with their descriptions?  
Answer   1 previous answer(s) Date: 5/26/2020 3:29:14 PM
Corrections are forthcoming via addendum.  
 
Subject: Wedge Detail Type: Plan
Question Date: 5/18/2020 3:53:00 PM
Where does the Wedge Detail on Sheet 1H(1B) apply? Is this intended for the safety wedge during Stage 1 shoulder construction?  
Answer   Date: 5/20/2020 2:20:07 PM
The wedge detail does not apply to a specific location. It is intended to show the 6:1 asphalt safety wedge that should be applied wherever it is needed, where the height difference in pavement exceeds 2”.  
 
Subject: Traffic Control - Stage 1 Type: Plan
Question Date: 5/18/2020 10:15:40 AM
Will the short term lane closure required for Stage 1 only be allowed during the hours listed on Sheet 1H(1A)? Sunday - Thursday 9PM-6AM  
Answer   Date: 5/20/2020 2:24:15 PM
The hours shown apply to every stage of construction, and not to have allowable times in Stage 1 that differ from other stages.  
 
Subject: B653, Preboring for 12” steel piles (Driven pile) Type: Plan
Question Date: 5/14/2020 11:54:06 AM
Plan quantities of 665(lf) and 381(lf), how are these quantities arrived at? Is preboring assumed for all driven piles to a certain depth?  
Answer   Date: 5/18/2020 10:23:51 AM
Quantities were generated based on the difference between an average elevation of the MSE wall footings and the elevations specified in the plans. See third note on sheet 2 of 69.  
 
Subject: B654, Preboring for 12” Steel Piles (with Rock Sockets) Type: Plan
Question Date: 5/14/2020 11:53:12 AM
The quantity of 1780(lf) was arrived from the footer subgrade elevation to tip elevation. Is the intent to drill/set piles after the MSE wall/backfill is installed?  
Answer   Date: 5/18/2020 10:24:20 AM
The intended sequence is to set the piles, then add the steel pipe sleeves, and then install the MSE backfill.  
 
Subject: Bridge Plans Type: Plan
Question Date: 5/14/2020 11:38:07 AM
On plan page 64 of the merged bridge files, the strap ratio for the MSE walls is listed to be 1.2, resulting in strap lengths as long as 53’. Due to the phased construction of the south bound bridge, you will not have the required area (length) for the strap lengths required. Please clarify how the contractor is supposed to installed the strap lengths specified.  
Answer   Date: 5/20/2020 2:13:15 PM
The specified reinforcement length from WP MSE B2 to B1 and A7 to A8 is adequate for external stability when the minimum reinforcement length to wall height ratio cannot be achieved due to temporary shoring. Final wall design and reinforcement lengths should be determined by the wall designer considering both internal and external stability. Existing Pier 1 at B653 Abutment A is pile supported. MSE Wall shop drawings and / or any temporary excavation support system will address exposing the existing Pier 1 pile cap and piles during MSE wall construction.  
 
Question Date: 5/14/2020 11:37:43 AM
On plan page 1 of the merged bridge files, there is a note that states “temporary shoring shall extend at least 3’ above adjacent riding surface”. We understand temporary shoring must be installed between for the phased construction of the southbound bridge, but is it mandatory the shoring must rise 3’ above the pavement? If this is the case it would be mandatory to use either sheet piling or a post and panel wall. If the shoring could be installed to the finished edge of pavement along with pinned precast barriers, a wire basket system could be utilized saving the department time and money. Could the requirement of 3’ above the finished pavement be removed?  
Answer   Date: 5/18/2020 10:25:26 AM
The intent of the requirement is to provide a barrier to keep traffic from impacting a barrier and subsequently going over the wall. For an added measure of public and worker safety, it is prudent to extend piles and lagging above grade a minimum of 3'-0 for the excavation behind the temporary traffic barriers. If the contractor feels they can satisfy the traffic impact requirement without extending the actual shoring wall above the riding surface, it will be considered when the shop drawings and associated design calculations are submitted to VDOT for review.  
 
Subject: MSE Wall Type: Plan
Question Date: 5/13/2020 5:05:29 PM
MSE Wall Data Table on Plan Sheet 64 of 69 requires a minimum Reinforcement Length to Wall Height ratio of 1.2:1. 1) Phase IV wall at WP B2 requires a reinforcement length of 40' however, there is only 27.5' from WP B2 to the temporary shoring line shown. 2) Phase II wall at WP A7 requires a reinforcement length of 50' however, there is only 38.9' from WP A7 to temporary shoring line shown and that 50' length would undermine the Existing Pier footing shown to remain in place. Since the 1.2:1 ratio cannot be achieved in these areas, please confirm and advise how to proceed.  
Answer   Date: 5/20/2020 2:20:52 PM
The specified reinforcement length from WP MSE B2 to B1 and A7 to A8 is adequate for external stability when the minimum reinforcement length to wall height ratio cannot be achieved due to temporary shoring. Final wall design and reinforcement lengths should be determined by the wall designer considering both internal and external stability. Existing Pier 1 at B653 Abutment A is pile supported. MSE Wall shop drawings and / or any temporary excavation support system will address exposing the existing Pier 1 pile cap and piles during MSE wall construction.  
 

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