Attachment 4 - Marshall Gulch Additional Notes.pdf

Renovate Marshall Gulch Picnic Area and Trailhead (GAOA)

Additional General Notes

1. Tree Removal

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.

2. Dewatering

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.

3. Water Source

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.

4. Night Work

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

5. Construction Date Limitations

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 5 & 6 shall be limited to between September 1st and March 1st. No construction can occur between March 1st and August 1st.

6. Public Access/Traffic Control

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 where 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.

7. Culvert: pre-cast or 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.

8. Drone use

The Forest Service allows the use of drones. Drone operators must follow the rules which were added to the amendment.

9. Flow regime of Sabino Creek

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)

10. Erosion/Pollution Control Plan

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.

11. Geotechnical Evaluation

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. It is expected that the contractor will encounter competent bedrock that will require pneumatic hammering and blasting. Blasting will be allowed between September 1st and March 1st. Prior to blasting, a blasting plan will need to be approved by the COR.

12. Excess Material

Excess fill/excavated material may be stockpiled at the staging area identified in the staging area map, approval from the COR is required. Contractor must ensure their staging areas do not impact/obstruct Pima County Right of Way.

13. 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.

14. Vaults

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

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.

15. Picnic Tables

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.

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

16. Topsoil

The contractor shall do their 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.

17. Clearing Limits

The contractor awarded the project will have the opportunity to walk the project area with the COR as part of the pre-construction meeting. During this time, the COR will be able to address safety concerns, answer questions, and flag clearing limits as necessary.

18. Felled Trees

Felled trees need to be cut to 16.5-foot lengths then hauled and decked at the staging area identified in the map included with this solicitation.

19. Beams

The contractor must secure a Pima County Right of Way permit for the transportation of the bridge beams up General Hitchcock Highway. Transport of the bridge beams may be required to be performed at night. A road closure is required to have prior approval from the County Engineer. A road closure may be limited to certain dates and times. A news release and coordination with the Town of Summerhaven will be required prior to the transport. News release coordination shall include the Community Relations Section of the Pima County Department of Transportation.

Coordination with emergency services, utility companies and the Summerhaven HOA and community shall take place and shall be considered in the date/time of the transport of the Bridge Beams.

20. Damage

Any Pima County or Forest Service assets that are damaged during construction and/or beam transport shall be replaced in kind in a timely manner (i.e. signs, guardrail, concrete barrier, curbing, etc).