Contractor_Questions_-_AKRO_response_10-08-2019.pdf

DENA 217466

FRONT COUNTRY UTILITIES October 8, 2019

Contractor Questions

September 13, 2019

Table of Contents shows Sections 409513 Control Panels and 432122 Pumping Equipment: Submersible Effluent Pump listed as sections in the specifications. Are those being used for this project?

The Table of Contents is not correct. Sections 409513 and 432122 are not being used.

September 20, 2019

Is it up to the Contractor to identify the clearing limits, limits on drawing are generic?

Limits of construction on the drawings are general. Contractor to develop the limits of construction per specifications (01 11 00 Summary of Work, 1.5 A.1) – Limits: confine construction operations to minimum extent necessary to accomplish the work…

What about the utilities not shown on the drawing? Are there as-builts?

Per the drawings, Sheet C1.1 - The Contractor shall be responsible or the determination of the exact location of all existing utilities prior to commencement of construction. It is the contractor's responsibility to protect all existing utilities, in place, unless otherwise noted. Park staff will assist with locating park owned utilities.

Are manholes to be installed insulated?

See drawings details (Sheet C3.7) and specifications (Section 33 05 16 Precast Concrete

Manhole Structures, 2.2D) for more information.

Are the manholes at the end of runs to be replaced?

See drawing plan and profile notes regarding end manholes to remain or be replaced.

September 27, 2019

Sheet C 1.1 note 14 mentions government owned borrow sources. Specs in 31 23 00 -13 3.8 also reference government owned materials (borrow) sources. Where is government owned borrow source? What materials are available there?

No government borrow sources are available.

Several sheets mention that not all underground utilities shown on profile. Are all the utilities within the project limits shown on the overhead views on the plans?

Contractor needs to verify the existence and location of underground utilities. NPS will assist in location of park owned utilities.

On sheet C 2.3 shows 2” drain to daylight. Install 3” ball valve on each side of tee. Is this intended to be all three sides of tee?

Detail 3 on Sheet C 2.5 shows drain to daylight and ball value. One ball valve on the tee section that leads to drain daylight.

On sheet C 2.3 what is the existing waterline infrastructure to be removed?

Note 1, Sheet C 2.3, Remove existing water main and structures where encountered in excavation.

For the water service connections shown on sheet C 2.2, is it anticipated that the connection to existing cast service can be made so as to not disturb existing sidewalks around comfort stations? That is, can connect far enough away from sidewalk so as not to disturb?

a. Yes.

For water and sewer pipe, it is shown with 16-gauge aluminum jacket. Is spray in place insulation with polyurethane coating an acceptable substitute?

Contractor to provide alternative for review during construction submittals.

Is any geotechnical or soils information available?

No.

Is groundwater expected to be encountered in the excavation?

Unknown.

In the event the existing material in trench section does not meet the requirements of Type A or Type B backfill how will contactor be compensated for export of unsuitable and import of material meeting the requirements? Or will contracting office approve existing material?

Contractor to coordinate with Contracting Officer (CO) and COR to determine next steps.

31 10 00 Site Clearing 1.1 A 1. Mentions disposing of grubbing at designated area on project. Where is the designated area?

Designated area will be identified by CO, COR, and/or park staff and is adjacent to project site.

31 10 00 1.2 C Bird window does not allow clearing between April 15 and August 1. The period of performance is within this window. In event nests are found in work area it would seem difficult to accomplish work. Please advise.

See Spec Section 31 10 00 1.2 D for detailed information.

31 10 00 3.2 I. 2 mentions replacing trees damaged by construction. Does this include trees approved to be cut?

No.

31 00 00-2 3.2 F and G. Can vegetative mat to be salvaged be mixed with existing topsoil and placed back with a dozer?

Intent is to move veg mats, stockpile, keep vegetation alive, then after construction, place the 2’ x 2’ section of mat back into disturbed areas.

31 00 00 -2 3.2 G. What if existing topsoil is not three inches thick?

Contractor to coordinate with Contracting Officer (CO) and COR to determine next steps.

Will there be a disposal area available in the park to put surplus material from excavation? If so at what location?

Removal of unusable material to go to a proper location off site.

Will existing water main and sewer mains to be demolished be in use during construction?

Yes.

Will temporary water and sewer services need to be provided to the comfort stations, RV dump station area, and shower house/Riley Creek Mercantile area?

See Spec Section 01 11 00 – 4: Existing Utility Interruptions on when interruptions are permitted and how to get approval to do so. Utilities are to be working and operational unless provided written permission from CO.

If sewer bypass required, what is current flow rate of sewer?

Contractor to coordinate with CO, COR, and park staff on sewer flow rate. Flow rates are minimal at night and during shoulder seasons (spring/fall).

If sewer bypass required will contractor be allowed to hook to park electricity for pumps to avoid using generators?

Contractor to coordinate with Contracting Officer (CO) and COR to determine feasibility.

Is an temporary electrical service anticipated to be needed?

See Spec Section 01 11 00 – 4: Existing Utility Interruptions. Reference this section regarding utility interruptions, and how they are permitted and how to get approval to do so. No anticipated interruption of electrical services.

33 31 13 -18 Sanitary sewer 3.3 k.1. states not to remove trees without written instructions unless tree removal shown drawings. Don’t see tree removal on drawings. It appears trees will have to be removed to do work. Please advise.

Minimize any clearing of trees per specifications: Spec Section 01 11 00, 1.5 Contractor Use of Site - "limit site disturbance, including earthwork and clearing of vegetation, to minimum required to accomplish the work, even when this is less than the limits identified." Also reference other spec sections, including Section 31 10 00 Site Clearing,

1.2 Site Conditions A. “clearing and grubbing shall only be executed where required to install proposed utilities;” and B. “No trees shall be damaged or removed without prior approval from the Contracting Officer.”

Will harco couplers be allowed to join sewer piping?

Contractor to provide for review during construction submittals.

Is an as built of existing improvements such as asphalt or concrete required so can be put back in the same place?

Pavement and trail cuts should be kept to a minimum and replaced in kind.

Is existing striping in areas of asphalt to be demolished MMA or oil based paint?

Striping shall follow MUTCD guidelines, and approved by CO.

31 21 33-4 3.2 2a. limits open trenches to 100 LF. Normal production rates exceed this. Will exceptions be allowed?

Contractor to provide alternative for review during construction submittals.

Will contractor be allowed to setup RV for employees to stay in onsite?

No, see Spec Section 01 11 00 -2 F. Construction Camp: not allowed within the park. The park will be closing the Caribou Loop of Riley Creek Campground and doesn’t want the wrong impression regarding access to only the contractor and not the public or the concessionaire that operates the campground.

October 1, 2019

1) How much clearing is anticipated? The corridor appears to be very tight.

a. Spec Section 01 11 00, 1.5 Contractor Use of Site - "limit site disturbance, including earthwork and clearing of vegetation, to minimum required to accomplish the work, even when this is less than the limits identified." Also reference other spec sections, including Section 31 10 00 Site Clearing.

2) Will hydro-seeding be required for disturbed areas?

a. No hydro-seeding. Spec Section 32 93 00 Plants identifies the removal and storage of vegetation mats, along with Salvaged Soil, for use in areas of construction where groundcover/vegetation mats are impacted due to construction of utilities. Salvaged soil may be placed with Park Staff adding seed to the salvaged soil.

3) The sewer main centerline along Denali Park Road appears to be in very close proximity to telecom line. Will the line be relocated by others?

a. This is the responsibility of the contractor. The site visit noted that the sleeve for the utility will be on the east side of the Post Office intersection instead of the west side, near that existing telecom line. Length of sewer main overall will be shorter and the number of manholes will remain the same.

4) Will the “pipe sleeves by others” be completed in a timely manner in the contractor’s trench?

a. Yes, sleeves are to be installed by road paving contractor in spring 2020.

5) Will the trench have to be left open until the sleeve is completed?

a. No, trench or boring under roadway and installation of sleeve will happen in

Spring of 2020.

6) Can the bedding sand be stockpiled in the lay down area?

a. Yes.