Bid Opening Date - November 14, 2025 9:30 AM CT

How should the 84" steel casing with the 72" pipe going through it connect to the gatewell with the 72" sluice gate?

Looking at the phase 1 cross sections from Station 908+75 to 909+00, what is the significance of the solid line below the main road?

Could an estimated quantity of Base Course Cl. 5 be provided for what will be placed below sidewalks and driveways?

Please note section 770-P02 on sheet 6-19 has two different brands of cobraheads specified. The ATB0-P457 fixture specified has 28,900 lumens and uses 211 watts as shown on sheet 140-23 but the GE/Current cobrahead specified only has 18,000 lumens and uses 130 watts. Can you verify which lumen output is required for the led cobraheads specified on sheet 770-P02?

Who would be a contact person with the Army Corps of Engineers that could answer additional questions pertaining to dewatering wells within the Levee Critical area. SP 565(24) Section B. Reference Standards: ER 1110-1-1807, Drilling and Invasive Activities at Dams and Levees (2023) discusses in part 6 'Drilling and Invasive Program Plan' part h. All boreholes and similar penetrations in the impervious portions of a dam or levee and its foundations must be backfilled by tremie-placed cement-bentonite grout or with bentonite pellets/chips. Can the annular space around the dewatering wells be filled with benotnie pellets/chips or will the annular space around the dewatering well need to be filled with tremie-placed cement-bentonite grout?

The purpose of this question is to request an alteration to the joint testing specifications as defined in Special Provisions, Joint Testing, SU-CPU-FTF-1-094(224)917-PCN 23278. The testing pressure and duration required under Paragraph A.4 in the above-mentioned Special Provisions increases the testing pressure and duration to a point that reliable results cannot be expected from gravity flow pipes. Most gravity flow pipes meet a 10.8psi pressure test as described in ASTM D3212, but these tests are conducted in laboratory settings, not in the field. It’s for this reason that field tests use lower pressure ratings and durations. Achieving field success for this project, the specification can be changed in one of two potential directions: Keep the same testing specification, but require welded joints for steel reinforced polyethylene pipe This will increase the installation cost for the project because each pipe needs to be welded, not bell/spigot The air test will likely need to be for the full length of pipe, not just the joints Air testing full runs of large diameter pipe is a safety hazard. Change the specification to follow only ASTM C1103-22, with no increases in testing pressure or duration Joint tests on steel reinforced polyethylene pipe can be conducted because it has two separate gaskets Depending on groundwater elevation, the testing pressure would be > 3.5psi. If the pressure drops less than 1psi in 5 seconds, the joint passes Contech can provide videos of the joint testing process as well as printed procedures for your review.

Cherne was unable to provide pricing or lead times for the testing equipment specified in SP 565(24) due to backorder. Is there alternate testing equipment or an alternate process that would acheive the same results.

Phase 1A to 1C shows install of 16" water main from STA 904+79 to STA 910+00 (Revised Addendum 2). The new 16" water main is to be installed basically on top of the existing 12" AC water main. The existing 12" AC water main will need to be removed to install the new 16" water main. This will cut off the water supply. How is water supposed to be supplied over the winter in 2026 - 2027?

In SP 565(24) regarding dewatering and piezometers states that they want one piezometer at the midpoint between each dewatering well. It appears that the dewatering wells are established through the Drilling & Invasive Program Plan (DIPP) under submittals A.iii.a and are not in any plans that we have been able to find. This is going to be impossible to bid because it requires a plan to be completed, which won't start on until the contractor is awarded the bid. Any guidance on the number of piezometers needed?

Reference bid item 53 Single Slope Barrier. This bid item falls under the 602 Concrete Structures specification. Typically the associated pavement is a separate bid item under the 550 concrete paving specification, Concrete Median Pavement. Since the slab pavement is incidental to the single slope barrier will the NDDOT require a seven day wet cure of the concrete pavement?

203-0140 Borrow Excavation - Where does the 1,500 CY of borrow get incorporated into the project?

Is the common excavation - Type A quantity of 67,647 CY correct? In the earthwork table on section 10, sheet 2 it only shows 20,238 CY of embankment along with 47,409 CY of waste.

In SP 573(24) Joint Testing, the joint testing specification is beyond the industry standard and suppliers have said that the specified pipe (Reinforced Concrete Pipe and Spiral Rib Steel Pipe) can not meet the Joint Testing requirements. The supplier is checking on Contech Duromaxx to verify it can meet the Joint Testing requirements. This pipe option is only listed for the 72IN Jacked or Bored pipe from Manhole 109 to Manhole 110. The SP says that joint testing is required of the storm sewer pipe between Manhole 113 and Manhole 107; and between Manhole 109 and Headwall 111. What pipe material is to be used for the pipe runs in order to meet the Joint Testing requirements?

Is the Flowable Fill for the pipe and structure backfill in the Levee critical area paid as neat line per the details in section 20? Or, will it be paid off of the delivered quantity on the ready mix tickets?

202-0021 - Remove Aggregate Base & Surfacing - The plan note states that the removal of temporary roadway surfacing is included in this bid item. What is the quantity of the temporary asphalt and cl. 5 gravel that gets removed?

Line item: 179 - 752 - 0850 Ornamental Fence: shows 2,740LF. The drawings indicate where the fence shall go but I can not find details for the design. Is this a standard item or what page can you find this information?

Is the sewer service connection on sheet 57-32 on existing 8" to be counted with the 11 sewer service connections on the 12"?

Can you clarify the intent for the storm sewer between Phase I and Phase II (2026 to 2027)? As it appears on the plans, the storm system would dead-end at ST915+60 while the nearest outfall is approximately 1300' to the East of this location and would not be connected until the following construction season. Is there a plan or preference for the water accumulation that will occur over the multiple months of project suspension and any damage that may occur due to multiple freeze/thaw cycles in said timeframe?

What is the seed blend for ND Class III Seeding?

Will the DOT allow 15" CMP in a 2-2/3"x1/2" Corrugation instead of spiral rib pipe. 15" spiral rib pipe is not commercially manufactured. The Mannings of spiral rib pipe and 15" 2-2/3"X1/2" corrugated pipe are the same at 0.012. Please see lower table of attachment.

Can you clarify where the GFI receptacles are being used that are referenced in spec section 770-PO6 on sheet 6-20 as section 85 is landscaping and section 140 has the street lighting and the light poles in section 140 have gfi receptacles but the poles are galvanized and the covers in 770-PO6 call for black covers. Please clarify where spec section 770-PO6 is being used.

Please note the combination signal pole with the 75 foot long mastarm shown on sheet 150-8 is too large to fit on a transformer base as the pole shaft has a 23 inch diameter. We are proposing an anchor base signal pole with an oversized handhole with the 23 inch diameter pole shaft to meet AASHTO wind loading requirements. Can NDDOT advise if an anchor base signal pole with an oversized handhole would be acceptable on just this signal pole shown on sheet 150-8? Thank you

Can you verify the led color of the led luminaires specified in section 770-PO2 on page 6-19 as the American Electric fixture is specified with 5000k leds but the GE/Current cobrahead is specified with 4000k leds. Please advise which led color is to be provided.

Can you verify the quantity of led luminaires required for this project as the bid items shown on sheet 140-23 has 72 led luminaires and I think we need 74 luminaires as i have 66 luminaires on the light poles plus eight more luminaires on the signal poles. Can you verify the quantity of led luminaires we are to bid on the lighting system shown on 140-23.

On sheet 140-23 pole B11 is listed at a twin davit arm pole but the bid items on 140-23 have all 65 poles as single davit arm poles. It looks like we should have 64 single davit arm poles and one twin arm davit pole. please advise.

Can you double check the Type R Tape quantities, It appears the Type - R quantities for phase 2 have been doubled up?

In SP 573(24) Joint Testing, the field joint testing specification is beyond the industry standard. We request using ASTM C1103-22 as called out without the additional testing time called out in Construction Requirements Note 4.

A note on sheet 20-16 says to "see geotechnical report for further soil boring details." Where can this report be found? It doesn't appear to be on the supplemental design data site.

For the 72" RCP pipe in an 84" steel casing through the Lower Heart Levee detailed on Section 20-Sheet 16. The outside diameter of 72" RCP C-wall is 85.5" and the steel casing specified is 84". The specified casing will not hold the RCP or allow for spacers and grout. Can the casing be upsized.

I did not see a casting table for the sanitary sewer manholes. Should those be R1733 or R1955-1 frames?

On Storm Water Lift Station - Site 3: Lift Station Mixed Flow Pump And Motor. Could you specify the motor enclosure required for this application? The motor specs call for submerged motor but according to Cascade that should not be the case. Thank you.

Should the 4" PVC perforated underdrain pipe be SCH40 PVC or SDR35 PVC? The cleanout detail shows SCH40 risers, but it shows the underdrain pipe as perforated HDPE.

In lift station 3, what size and pipe type is pump pit can pipe supposed to be? (DI pipe or SS Pipe)

For Lift Station Site 3, should there be a bid item for the 16" & 8" force main pipe? Or is all that pipe to be bid with the Lift Station Site 3 bid item?

Section 140 Sheet 10 - Feedpoint 2 is shown as installed in Section 150. I do not see a street lighting feedpoint referenced in the chart on Section 150 Sheet 21. Was this missed and should it be in the Traffic Signal Items or should it be included in the Street Light Items?

On Section 150 Sheet 21 - Traffic Signals System Table - the signal poles are listed as Type IV Signal Standards but the elevation views are showing Combo signal/light standard poles. I would guess by the elevation views and extra LED fixtures the intent is Combo signal poles but it is listed different in the table. 3rd St SE Intersection - No Video Detection System is listed in the plan quantity table and there is reference to 1 ea Emergency Vehicle Pre-Emption Equipment. The Signal Pole Profile views show Video Cameras & EVP units on all the poles. What is the intent here? Remove & Relocate EVP/Video off existing span wire system or supply new?

It appears that the intent is to construct the center turn lane east of 915+60 with the WB through lanes. It also appears that the phase 3A work area limits are right on the south edge of the center turn lane. The phase 4A work area limits appear to be down the middle of the inside EB lane. Similarly, the construction limits run down the middle of a lane in the 24th Ave and 3rd St turn lanes. How are these lanes supposed to be constructed? If this is incorrect, how much room is given between the edge of the lane that is being constructed and the removal limits?

On the Allowable Pipe List, Section 51, Sheet 10. At station 29E/29D it has 18" as the diameter. On Plan and Profile, Section 55, Sheet 44. It shows 15". What is the correct diameter required?

I saw there is water main restraint length table on sheet 20-22, but per City of Mandan construction spec it says "When installing watermain larger than 12 inches, on either side of each fitting and valve, a minimum of 50 lineal feet and 2 uncut sections of pipe, shall be installed with restrained joints". Should we follow the table on the plans or the City of Mandan construction spec when it applies to the restraint lengths for the water main pipe?

Section 6 Sheet 4 Note 704-510 allows for masking but the Governing Specifications 07/01/2024 does not allow any masking. Please specify exactly what will be allowed for Obliteration of Pavement Marking on this project.

In the Allowable Pipe List. Section 51, Sheet 9, at Begin Station 26. Should the 58" x 36" Spiral Rib Steel Pipe thickness be .109 instead of .064? Section 51, Sheet 11 at Begin Station 104. Should the 60" Spiral Rib Steel Pipe thickness be .109 instead of .064? Section 51, Sheet 13, at Begin Station 304. Should the 44" x 27" Spiral Rib Steel Pipe thickness be .109 instead of .064?

In SP584 Drilled Shafts Will the size 5 aggregate be required for this application?

Would it be possible for the State to make the the design files for this project (.dwg / .xml) available so that we can further analyze the earthwork requirements?