25-26-41 Wildwood_Boardwalk_B2_Addendum_2.pdf

Wildwood Park Boardwalk Bid Package B2 Addendum No. 02

Project Name: Wildwood Park Boardwalks Project No.: RFP#25-26-41 Prepared By: Mark Nottingham Date: 05-11-2026

Project Clarifications:

• Please see the following pages for answers to questions submitted to date.

kimley-horn.com 421 Fayetteville Street, Suite 600, Raleigh, NC 27601 919-677-2000

Question No. 1: Can the spans be adjusted to avoid stumps?

Response : Spans may be shifted, however, maximum span lengths for foundation types are as follows:

• Foundation type 2 and 4 - maximum span of 10'

• Foundation type 3 and 5 - maximum span of 13'

Question No. 2: Can a splice detail be considered for the piles?

Response : No. Splicing timber piles is difficult to align & maintain pile integrity.

Question No. 3: Can an auger be used on the first 15-20’ before driving piles?

Response : No. Current environmental permits do not allow for using an auger or pre-drilling.

Question No. 4: Can a floating/amphibious excavator be used to drive the piles?

Response : Yes. A floating or amphibious excavator would be allowed as long as the substrate is not disturbed. Contractor will need to plan accordingly during lower water levels to prevent churning up the substrate.

Question No. 5: The City will allow some vegetative debris to remain on site in a mutually agreeable location?

Response : Vegetative debris may be located onsite beyond any riparian buffers pending approval by the City.

Question No. 6: The access road can be improved and vegetation cut as needed during construction?

Response : Any improvements or cutting vegetation within the riparian buffer beyond the Limits of

Disturbance (LOD) included in the permitted plans is restricted per below.

Zone 1 (inner 30-feet) must remain undisturbed with only selective pruning, removal of dead, diseased or hazardous trees, and removal of invasive species allowed.

kimley-horn.com 421 Fayetteville Street, Suite 600, Raleigh, NC 27601 919-677-2000

Zone 2 (outer 20-feet) allows for minor vegetation maintenance including pruning or trimming, removal of dead, diseased or hazardous trees, removal of invasive species. Managed vegetation is allowed, but buffer function must be maintained. Temporary roads up to 2,500 SQFT of riparian disturbance allowable provided disturbed area is restored to pre-construction topographic and hydrological conditions & comparable vegetation within two months of construction is completed.

If the access road was present within the riparian buffer as of July 22, 1997 and has continued to exist since that time, the use & activities to maintain the existing & ongoing use are exempt as long as the site remains similarly vegetated & no built upon area is added within the riparian buffer.

According to historical aerial imagery, the access road has been in existence since at least 1993 & continuously operated to date.

Question No. 7: At this time, FRP grate deck for the decking, is not included in the bid solicitation?

Response : FRP is not currently being considered. In the event a FRP boardwalk is requested, we would recommend using a single manufacturer for all FRP boardwalk components, not just FRP grate decking as these are typically designed as a FRP system and not interchangeable with timber boardwalk elements. In addition, the boardwalk sections with longer piles (over 50-feet in length) are not isolated to certain areas. Transitions between timber construction and FRP construction may be intermitted and reduce efficiencies with specialized contractors or equipment.

Question No. 8: Some pile lengths are shown at 55’. It is more environmentally friendly to build this boardwalk from top-down. A machine that can rest on this bridge for top-down construction will be too small to handle 55’ length piles. At the most, for top-down construction, 35-40’ length piles could be used. A crane of some sort would be needed to handle 55’ length piles, which would need mats, causeways, etc. Could the design loading be scaled back, or an additional wood pile added to bring pile lengths down?

Response : Pile lengths were based on axial capacity & there is potential to reduce pile length with additional geotechnical testing along the final boardwalk alignment or similar to Package ‘A’ with a pile driving performance submittal (Sec. 450 of NCDOT Road & Bridge Specifications) for initial piles.

Foundation requirements had minimum embedment for each unique design to satisfy lateral capacity.

Beyond that, pile will be driven until meeting required blow counts to indicate axial capacity. If the piles encounter a dense bearing strata, the blow counts will increase rapidly or refusal may occur.

The difference in pile length for differing capacities will be minimal. For this reason, fewer high capacity pile is a more efficient design than more, lower capacity piles.

The Gum Swamp section included limited geotechnical data with using hand tool data only due to difficulties with access. The pile lengths included were based on the assumption that dense strata would not be encountered. In the event, additional geotechnical data can be achieved demonstrating dense strata may be encountered, shorter piles may be achievable. Deeper borings drilled in other sections of the project site documented random or sporadic dense layers of strata at varying depths.