Industry Day Questions_For Contractors.docx

Lowell Creek Flood Diversion Industry Day 2 24 June 2025

Industry Feedback:

1. Based on the provided presentation are there any construction concerns and/or risks about this project that you’d like to inform us of at this time?

a. If so, are there potential mitigative solutions for these risks that can be implemented into the final design of the project?

2. How do you see the project being most effectively constructed?

a. Would you primarily use land or any barge-based methods?

b. Winter construction?

c. Construction sequencing for inlet, tunnel and outfall?

3. What concerns does your company have on site access, laydown, and disposal areas?

a. Are you concerned about the distance from laydown to the project site?

4. What concerns do you have with ability to adequately supply materials, equipment, and labor for the project to ensure timely execution of work?

5. List your construction risks associated with constraints in the inlet and outfall areas.

a. What challenges do you anticipate with foundation preparation/cleaning at the inlet and outfall areas?

6. Does your company have any concerns on coordinating work with other sub-contractors in limited workspace?

7. How would your company plan for encountering cobbles and boulders at the project site?

a. How would you plan on drilling through cobbles and boulders during pier construction?

b. How would you plan on handling removal of cobbles and boulders encountered during excavation?

8. Do you plan on setting up a riprap/gravel processing plant near the project site to manufacture materials for constructing access roads and cofferdam?

a. List construction risks associated with using materials from the inlet area excavation and tunnel blasting as source materials.

9. Concrete Materials

a. Where would you source aggregate from?

i. Local sources? Seward?

ii. Regional sources? Anchorage?

iii. Out of state sources? British Columbia?

b. How will you transport aggregates?

i. Rail? Alaska sources

ii. Barge? British Columbia sources

iii. Truck? Alaska sources

c. Where would you source cement from?

i. Local sources? Alaska

ii. Lower 48? Seattle?

iii. Canada? Vancouver?

d. What kind of cement will you use? Portland (I/II), blended binary (IS, IP, IL), blended ternary (IT)?

e. Where would you source supplement cementitious materials (SCMs) such as silica fume, fly, and slag from?

i. Lower 48? Seattle?

ii. Canada? Vancouver?

iii. Alaska does not have SCM sources.

f. Any concerns using silica fume for abrasion resistant concrete?

10. Importing Concrete Materials

a. Any concerns importing from out of state? Lower 48?

b. Any concerns importing from Canada? Potential tariffs

11. Onsite batch plant(s) will be required for producing concrete and grout

a. How many batch plants are needed?

b. How much area is needed for the batch plant(s)?

c. Where would the batch plant(s) be located and why?

d. What kind of water source would be used?

i. Potable utility?

ii. Non-potable well?

iii. Other?

12. Transporting Concrete

a. How will concrete be transported from the batch plant to the project site?

b. Trucks, pumps, or conveyor belts?

13. How would your company control surface and ground water to facilitate construction of inlet channel structure and inlet tunnel portal?

a. How would you phase construction of the inlet structures (left wall, right wall, flume) to accomplish dewatered conditions at each feature?

b. What is the greatest risk or uncertainty you foresee in accomplishing dewatering at the inlet for the purpose of the inlet structure excavations and tunnel portal excavations?

c. How long of a duration do you anticipate dewatering systems would be required to be in operation to complete construction of the inlet features and tunnel portal entrance in the dry.

14. How would your company monitor creek stage during construction to inform activation of temporary flood management plan?

a. What key variables would impact the temporary flood management plan?

15. How would your company maintain the existing tunnel discharge and how would you handle large volumes of sediment discharged from the existing tunnel during large flow events (100 cfs)?

a. How would your company manage sediment deposited in temporary access culvert boxes located in the inlet and outlet areas?

16. How would you approach diverting traffic to Lowell Point during outfall construction and how would you manage that traffic?

17. Estimated production rate for drilling and blasting?

a. For 18ft tunnel how much additional space would be required for construction?

18. Anticipated labor numbers? Plan for housing?

19. How long do you anticipate the construction duration to last for this project?

a. Do you see potential to reduce costs and/or construction conflicts by shortening or lengthening the construction schedule?

20. How would your company approach placing granite pavers?

a. What equipment is required?

b. How would you maintain tolerances?

c. Any limiting thresholds that dictate paver size? (ie. Equipment, tunnel size, paver weight)

21. Does your company have experience constructing project components to meet high seismic criteria?

22. How would your company approach a communication plan, particularly with stakeholders in regards to blasting?

23. Are there any additional risks or concerns not discussed?

24. How would you sequence construction of the project?

25. How would you sequence construction of features at the inlet?

26. How would you review the project design for constructability and conduct conflict analysis?

27. What challenges do you foresee in construction of large diameter piers (6 to 8 feet) socketed greater than 10 to 20 ft into rock?

28. Would a Project Labor Agreement prevent your firm from bidding on this project?