Marshall Gulch PreBid Q and A.pdf

Marshall Gulch Renovation Pre-bid Meeting April 16, 2024

Question and Answers

1. Where are the plans titled “Proposed Road and Bridge Plans for Marshall Gulch” referenced in the Statement of Work.

The plans for the road and bridges were not included the original solicitation, they have been included in this amendment. (Attachment 0008)

2. The contract clause on page 7 was incomplete, can the insert be provided prior to the proposal submission deadline?

The clause will be updated in this amendment.

3. Is this RFP using a design-build or design-bid-build procurement acquisition method?

This project does not include design, the road and bridges have already been designed, see the plans in this amendment.

4. Can more detailed instructions for tree removal be provided?

The General Notes in the Renovate Marshall Gulch Picnic Area and Trailhead Plans have instructions on Tree Clearing. The COR will verify that the trees to be felled have been correctly identified and marked with high visibility ribbon. The logs will need to be hauled to the staging area identified in the map included with this amendment. (Attachment 0009)

5. Where are the staging areas?

Staging areas within the construction limits can be established with COR approval. For a staging area outside of the construction limits see staging area map included with this amendment.

6. Can water pumped out of the stream as part of a dewatering plan be used for construction?

If a dewatering/bypass plan is utilized to keep water out of Sabino Creek during construction, all the water pumped out must be returned to the stream downstream of the active construction area.

7. Is there any water sources nearby?

The Coronado National Forest doesn’t not have a water source near Marshall Gulch. The closest water source is in the Town of Summerhaven. The water would be purchased from the Mount Lemmon Domestic Water Improvement District.

8. Can construction activities occur at night?

The contractor shall limit construction activities to the daylight hours until September 1st. From September 1st to March 1st night construction activities are allowed.

9. Is there threatened or endangered species that will limit construction operations?

Yes, MSO breeding season is March 1st to August 31st. Construction north of Marshall Creek shall be limited to between August 1st and March 1st. Construction on Additive Items 4 & 5 shall be limited to between September 1st and March 1st. No construction can occur between March 1st and August 1st.

10. Does access need to be maintained for the Marshall Gulch, Sunset, and Aspen Trailheads during construction?

The contractor shall submit a Traffic Control Plan that includes maintaining pedestrian traffic from the gate 1,800 feet north of the existing lower water crossing to the trailheads. Periods were work is occurring on the road to the trailheads or other activities which present danger to pedestrian are occurring, the Coronado National Forest will inform the public that the trailhead area is closed to pedestrians. The contractor shall keep the project schedule up to date and provided the COR at least one week’s notice prior to restricting pedestrian traffic.

11. Does the culvert need to be pre-cast or can it be cast-in-place?

The culvert may be cast-in-place; however, a precast culvert will reduce the duration of the dewatering/bypass plan and may make the construction easier.

12. Can drones be used for construction purposes?

Yes, the Forest Service allows the use of drones. Drone operators must follow the rules which were added to the amendment. (Attachment 0010)

13. What is the flow regime of Sabino Creek during the planned construction period?

Pima County has a streamgage on Sabino Creek just below the project area, data can be accessed through the County ALERT website, PCRFCD ALERT Google Data Display Map (pima.gov)

14. Does the soil erosion, pollution control, stream diversion and dewatering plan have to include a stream bypass where water is impounded, pumped, and then released downstream?

Depending on the stream flow regime at the time of construction and the erosion control methods proposed in the plan, a stream bypass may not be necessary. The contractor shall submit the Plan two weeks in advance of the instream bridge work. The COR and GTM will determine if changes are needed and provide prompt feedback to contractor.

15. Has there been a geotechnical investigation?

The General Notes in the Proposed Road and Bridge Plans indicate that Ninyo & Moore performed a geotechnical evaluation. Morrison Maierle had access to this information and found that excavated material would be suitable as fill material for road construction. The awarded contractor may also request the geotechnical report.

16. Is there a site for disposing of excess material?

Excess fill material may be stockpiled at the staging area identified in the map included in this amendment, approval from the COR is required.

https://alertmap.rfcd.pima.gov/Gmap/Gmap.html

17. Are there any utilities?

There are no known active utilities in the Marchall Gulch Trailhead area. There are some abandoned hydrants and piping to those hydrants may be discovered during excavation. However, the contractor shall still notify Arizona Blue Stake prior to excavation.

18. Will the Forest Service empty the vaults prior to construction?

Yes, the contractor shall indicate a period of time when they would like the vault pumped in their schedule and the COR will coordinate with the Forest’s pumping contractor.

19. If the CXT is moved will a new vault be required?

No, according to the CXT Vault Building Maintenance Manual, vaults may be relocated. If the vaults are found to be damaged, then new vaults will be needed and the contractor shall submit a change order request for additional funds to cover the cost of the new vaults.

20. What to do with picnic tables that are damaged? What to with picnic tables that are not damaged?

Picnic tables that are damaged shall be hauled away from the site by the contractor. Picnic tables in good condition shall be placed in locations within the project area identified by the COR.

21. Are permits from the County or any State agency required?

The entire project area is on Forest Service Land and the Forest Service does not require permits;

however the contractor shall be responsible for ensuring they have any permits that are required by state or other federal agencies.

22. What if there is not enough topsoil for seeding after retaining wall demolitions and the stream reconstruction on Marshall Creek?

The contractor shall do there best to strip topsoil prior to excavation and use the topsoil in areas that need seeding. If there is not enough onsite topsoil then the contractor does not need to purchase topsoil, the COR will help prioritize the areas that could use the topsoil the most.