B09_Amend_0003_Att_Q-and-A_as_of_10-23-26_0003.pdf

YELL 338223 Bridge Preservation

140P2026R0073

Answers to Questions as of 10/23/2026

Q1. Drawing / specification references

Stamped drawings: sheets 21–27 (repair, expansion joints, hydrodemolition and overlay details);

Specifications 03 30 10, 07 18 01; Solicitation Section C and Section B.

The project describes modified concrete overlay and hydrodemolition. Prior RFI asserted that

Section C references epoxy overlay; exact Section C wording requires final confirmation.

Addendum 2 discusses hydrodemolition and overlays but does not establish a revised quantity/payment mechanism.

Confirm the governing deck overlay system at each bridge; design removal depths and limits;

whether deck soundings/field deterioration beyond depicted limits are included in the lump sum;

treatment and compensation of additional unsound concrete; and required collection, testing, transport and disposal of hydrodemolition wastewater.

A1. No epoxy overlay is included in this project. The governing deck systems are:

(a) Lava Creek Bridge (1570-022P): Mill the existing asphalt (estimated 4 in. thick), sound the exposed concrete deck, and complete concrete repairs. Then install a waterproofing membrane and an asphalt overlay matching the existing thickness, 2 in.

minimum (Sheet 9 (S03) Item 8; Sheet 30 (T32.12D); Specifications 32 12 16 and 03

30 10).

(b) Thumb Creek Bridge (1570-029P) and Unnamed Creek Bridge (1570-030P):

Hydrodemolition to a depth of 1 in. minimum and 1-1/2 in. maximum over the 34'-0" width between curbs, for the full length of each bridge. This is followed by a modified concrete overlay with transverse grooving, either latex-modified (Overlay-

LM) or silica-fume-modified (Overlay-SF) at the Contractor's option (Sheets 13, 18, and 25; Specification 07 18 01).

The only epoxy or polymer products in the contract documents are polymer resin concrete, epoxy injection, and crack sealing materials under Section 03 30 10.

Unsound concrete within the hydrodemolition limits. After the first pass, the

Contractor marks remaining unsound concrete for CO approval and removes it with a second pass or approved hand methods (07 18 01, 3.1). The following are included in the lump sum, priced on the quantities in Table 01 32 16: the second-pass removal, the equipment demonstration (3.2.B), and the deck, expansion-joint, and overhang repairs shown on the plans.

Deterioration beyond the depicted limits. If deterioration exceeds the Table 01 32 16 quantities, extends beyond the 1'-0" removal limits at expansion joints or the 1'-6" limits at overhangs (Sheets 22 and 23), or requires full-depth repair, stop and notify the CO.

Work directed beyond the contract quantities will be addressed by modification under

FAR 52.243-4, Changes.

Hydrodemolition wastewater. The Contractor shall sample, test, monitor, manage, and neutralize all hydrodemolition runoff. Runoff shall be collected, filtered, hauled, and disposed of outside the Park as a liquid industrial waste in accordance with state and local laws. No discharge, filtered or unfiltered, is permitted to streams, deck drains, approach downspouts, floodplains, or wetlands. Cover deck drains during all work and use potable water for hydrodemolition. Submit the containment, collection, and disposal method for

CO approval (07 18 01, 1.2.A and 3.1; 01 10 00, 1.9.D; Sheet 25, Note 1).

Q2. Drawing / specification references

Stamped drawings: sheets 3, 5–7, 16–19 and 28–29 as applicable; Specifications 01 10 00, 31 25

00, 31 37 00; NWP 13, Wyoming regional conditions and EPA 401 documentation

Addendum 2 confirms in-water work, scour mitigation and temporary stream diversion; it does not itself constitute an issued site-specific authorization. The conference also identifies trout-related timing restrictions.

Identify the permittee and provide any issued Corps NWP 13 verification, Section 401 conditions and project-specific authorizations. Confirm responsibility for preconstruction notification, temporary diversion/dewatering design and approval, allowable in-water work dates by bridge, flow criteria, and any restrictions beyond the contract documents.

A2. The National Park Service is the permittee for the Government-furnished permits: the U.S.

Army Corps of Engineers Section 404 authorization and the Clean Water Act Section 401 water quality certification (01 31 00, Government Furnished Permits). Within

Yellowstone National Park, EPA Region 8 is the Section 401 certifying authority.

Specification 01 31 00 is revised to delete the Wyoming Department of Environmental

Quality as an agency with jurisdiction.

Permit status: This project has been approved for a No-PCN NWP 13 for Bank

Stabilization and No-PCN NWP 14 for Linear Transportation Projects. The project may proceed provided the Government and it’s contractors comply with all terms and conditions of the NWP-13, Wyoming Regional Conditions for NWPs, and EPA 401

Certification Letter that are attachments to this solicitation.

Contractor responsibilities. The Contractor designs, submits, installs, maintains, and removes all temporary stream diversion and dewatering systems, including:

(a) the stream diversion and dewatering plan, submitted at least two weeks before in-water work (31 25 00, 3.6.A; Sheets 5 and 6, Work Area Isolation Notes);

(b) the in-water work plan, submitted at least 28 days before construction (31 25 00, 3.5.A);

(c) fish capture and relocation, with two weeks' notice to the CO (31 25 00, 3.6.C);

(d) any contractor-provided permits required by its means and methods.

Written CO approval is required before any in-water work.

Design and flow criteria. Diversion systems shall pass the 2-year flood event plus 1 ft of freeboard. Maintain at least 90% of upstream flow downstream, and do not fully divert channel flow. Work in flowing water is not allowed. Dewatering is required only for the scour protection at Lava Creek. Riprap and geotextile at Thumb Creek and Unnamed

Creek may be placed in ponded water. Pump sediment-laden water upslope; do not discharge it directly to the stream. Screen pump intakes (01 10 00, 1.6.M; 31 25 00, 3.6.D; Sheets 5 and 6).

In-water work dates. At Thumb Creek, no work that would disturb Yellowstone cutthroat trout spawning from April 15 through July 15, including culvert cleaning and in-water work (01 10 00, 1.9.B.2). At all sites, vegetation clearing and ground disturbance from March 1 through August 15 require a nesting survey and clearance (01 10 00, 1.9.B.1). The contract documents contain no other in-water date restrictions at Lava

Creek or Unnamed Creek.

Q3. Drawing / specification references

Stamped drawings: sheets 30–36 (temporary traffic control); Specifications 01 10 00, 34 20 00;

Addendum 2 conference slides pp. 7–8 and transcript pp. 4–5

ANSWERED IN PART by Addendum 2: Thumb and Unnamed Creek share one singlelane work zone; 10-minute maximum holds; four weeks advance lane-closure notice; 14 days for requested night work; closures require 28 days’ notice and a 1 AM–5 AM window; ordinary hours are 7 AM–7 PM or one hour before sunset, Monday–Friday.

With the above requirements acknowledged, please confirm whether both southern bridges may undergo deck/railing work concurrently within the shared work zone, and whether any exception to 10-minute traffic holds will be authorized for concrete placement, overlay curing or joint work. If not, identify the required temporary bridging or phased construction standard.

A3. Yes. Deck and railing work at Thumb Creek and Unnamed Creek may proceed concurrently, provided that all work at both bridges is within the single shared one-lane work zone, one lane is kept moving at all times, and traffic holds do not exceed 10 minutes in either direction (01 10 00, 1.3.A and 1.9.A.7; Sheets 11 and 16, Note 7).

No blanket exception to the 10-minute maximum hold will be authorized for concrete placement, overlay curing, or joint work. The CO may adjust the hold time only in response to traffic backups.

The contract documents anticipate half-width construction. Overlay, expansion joint, and deck edge work is constructed one half at a time, with traffic on the adjacent lane behind temporary barrier (Sheet 22, Notes 1 and 10; Sheet 25, Note 3; Sheet 34). Placement and curing therefore occur behind the lane closure and do not require holding traffic. Provide a minimum lane width of 12.5 ft (34 20 00).

Temporary bridging is not required. If the Contractor's sequencing cannot meet the hold-time limit across the combined work zone, the work shall be phased so that it can. Short full closures may be requested between 1:00 a.m. and 5:00 a.m. with 28 days' notice.

Q4. Drawing / specification references

Stamped drawings: railing/painting details by structure; Specifications 09 90 00, 01 35 23, 01 74

19; Addendum 2 transcript p. 8

ANSWERED IN PART by Addendum 2: all three structures tested positive for leadbased paint.

The conference confirms cleaning and painting of railing and certain exposed steel members.

Provide available lead testing reports and define the surfaces/limits requiring paint removal versus preparation and overcoating; specify containment performance criteria, waste characterization/disposal, air monitoring and clearance testing, and whether the Government will require complete removal of existing coating at any location.

A4. Lead testing reports: Attached as Attachment 338223 Lead Paint Testing Results

(a) Thumb Creek (420 LF) and Unnamed Creek (290 LF) railings: Remove the railings, blast clean them to SSPC-SP 10 near-white, and paint them off-site. Piece-mark all components and reinstall each one in its original location. Complete coating removal is required (09 90 00, 3.3.B.1.a; Sheet 26, Note 8).

(b) Lava Creek railing (64 LF): Clean and paint the railing in place using SSPC-SP 2 hand tool cleaning to remove loose paint, rust, and contaminants. Existing sound paint not removed is encapsulated by the new paint system (Sheet 26).

(c) Lava Creek steel girders: Clean and paint the exposed bottom flanges, approximately 300 SF (Sheet 26). Complete coating removal is not required at Lava

Creek. A 30 SF test area is required to verify overcoat compatibility (09 90 00, 3.4.B.3).

Containment, waste, and monitoring. Containment is designed by the Contractor's

SSPC QP2 competent person in accordance with SSPC Guide 6. It shall prevent debris from reaching the waterway, the ground, or the traveled way, and the containment plan shall be submitted for approval (09 90 00, 1.4). Perform the worker exposure assessment and air monitoring in accordance with OSHA 29 CFR 1926.62; ambient emissions shall comply with 40 CFR 50.6 and 50.12. Characterize waste (including TCLP), transport it, and dispose of it outside the Park in accordance with 40 CFR 260–268 and SSPC Guide

7, including all wash water (09 90 00, 3.2; 01 74 19). No clearance testing is required beyond visual clearance of the containment area.

Q5. Drawing / specification references

Stamped drawings: existing conditions and traffic-control sheets; Specifications 02 41 00, 34 20

00; Addendum 2 transcript pp. 8–9

ANSWERED IN PART by Addendum 2: existing temporary barriers at Thumb and Unnamed

Creek are only on the west side; the contractor is to move them to Arnica pit.

Confirm the actual barrier count and individual unit types/weights at each bridge, Arnica pit unloading location and stacking requirements, whether barriers are Government property to be protected/reused, and how pre-existing damage or units unsuitable for relocation will be handled.

A5. The existing temporary concrete barrier is on the west side only, running the full length of each bridge: approximately 209 ft at Thumb Creek and 145 ft at Unnamed Creek. Sheet

14 (S08) Item 10 and Sheet 18 (S12) Item 8 are revised to delete "both sides."

The Park's estimate is 21 10-foot units at Thumb Creek and 14 10-foot units at Unnamed

Creek with crash cushions on the end of each. There is no product data sheet available for these.

The barrier is Government property and shall be protected during removal, loading, transport, and unloading. It may remain in use during the railing work before removal

(Sheets 13 and 18). Transport it to the Arnica pit near the Pumice Point picnic area and unload it where the CO designates. Stacking requirements will be coordinated with the

CO, Park POC, and COR.

Before removal, photo-document the condition of each unit (01 32 33). Pre-existing damage is not the Contractor's responsibility. Damage caused by the Contractor's operations shall be repaired or replaced at no cost to the Government. Report any unit that cannot be safely lifted or relocated to the CO before removal.

Q6.Drawing / specification references

Stamped drawings: existing conditions and traffic-control sheets; Specifications 02 41 00, 34 20

00; Addendum 2 transcript pp. 8–9

ANSWERED IN PART by Addendum 2: existing temporary barriers at Thumb and Unnamed

Creek are only on the west side; the contractor is to move them to the Arnica pit.

Confirm the actual barrier count and individual unit types/weights at each bridge, Arnica pit unloading location and stacking requirements, whether barriers are Government property to be protected/reused, and how pre-existing damage or units unsuitable for relocation will be handled.

A6. See Response A5. Question 6 duplicates Question 5.

Q7. Drawing / specification references

Stamped drawings: Lava Creek repair/stone restoration sheets; Specifications 04 01 40, 03 30 10;

Section B lumpsum CLINs

Addendum 2 confirms masonry repointing at Lava Creek; no specific replacement-stone source or changed-quantity allowance was identified in the reviewed conference material.

Confirm the required stone matching and mortar approval process, whether sample panels or mockups are required, and whether repair/repointing limits shown are fixed quantities or indicative areas. How should hidden deterioration requiring additional masonry or concrete repair be priced under the lumpsum CLIN?

A7. Mortar matching and approval. Test three areas of existing mortar for composition and strength (04 01 40, 1.2.D). New mortar shall match the existing mortar in strength, composition, color, and texture, using obsidian sand pressed into the face of the finished joints. Masonry cement and preblended mortar mixes are prohibited (04 01 40, 2.1).

Mock-up. A field mock-up is required at a location directed by the CO. It shall be a minimum of 3'x3' (Sheet 24) and include at least 3 LF of vertical and horizontal joints.

The CO and the Park Representative must accept the mock-up before production repointing begins (04 01 40, 1.3.B).

Repointing limits. The 950 SF quantity is an estimate. Actual limits are established by the Contractor's field survey and annotated photo documentation, approved by the CO before work begins (04 01 40, 1.5.B). Repoint only deteriorated joints as defined in 04 01

40, 3.2.A.9.

Stone repair. The stone repair at the west abutment resets the existing fractured stone facing pieces, recovered from the channel, using stainless steel helical dowels and masonry repair bonding grout (Sheet 24, Note 2). No replacement stone source is required. If the existing facing cannot be salvaged, notify the CO.

Hidden deterioration. Price the lump sum CLIN on the quantities and descriptions shown. Concealed conditions that differ materially from those indicated will be evaluated under FAR 52.236-2, Differing Site Conditions. For the abutment bearing seats, see

Responses A13 and A14.

Q8. Drawing / specification references

Specifications 01 10 00, environmental restrictions; Addendum 2 transcript pp. 5 and 9

ANSWERED IN PART by Addendum 2: NPS performs bird surveys on at least 14 days’ notice;

a raven nest was noted at one bridge; Thumb Creek sediment-disturbing work should avoid April

15–July 15 to protect cutthroat trout.

Identify the bridge/location and anticipated protected period of the existing raven nest and clarify whether any railing or concrete work is prohibited pending biological clearance. Confirm the procedure and schedule treatment if survey results prevent work within the approved construction window.

A8. The nest is beneath the east deck overhang of Thumb Creek Bridge (Sheet 14 (S08) Item 13;

CLIN 2.p). Ravens are protected under the Migratory Bird Treaty Act. The nest may be removed only outside the nesting season (March 1 through August 15), or after the CO verifies it has been abandoned for the season.

Railing and concrete work is not categorically prohibited. While the nest is active, work in its vicinity is subject to a buffer and timing set by the Park bird program, and the nest shall be left in place until the young fledge (01 10 00, 1.9.B.1).

Request bird surveys through the CO at least 14 days in advance (Bird Program Manager, 307-344-2218). NPS will perform the surveys, and Specification 01 10 00, 1.9.B.1 is revised accordingly.

The baseline schedule shall account for the wildlife restrictions in the contract documents. If a survey identifies an active nest not identified in the contract documents, and it prevents work within the approved construction window, the CO will evaluate the impact under the contract's suspension of work and excusable delay provisions.

Q9. Is a certified arborist required for tree removal?

A9. No. A certified arborist is not required. Tree removal shall comply with the following:

(a) Remove only trees marked and approved by the Park before cutting: approximately

25 trees at Thumb Creek and 30 trees at Unnamed Creek, larger than 3 in. in diameter, under the bridge and within 20 ft of it (Sheet 13 (S07) and Sheet 18 (S12), Item 1).

(b) Leave stumps in place at a height of 6 in. or less. Limb the trees on one side only, so the trunk lies flat and perpendicular to the slope. Scatter cut limbs on the slope as approved by the CO.

(c) Perform tree removal between August 16 and February 28, or after a nesting survey and clearance (01 10 00, 1.9.B.1). Coordinate with NPS for Section 7 consultation before any tree trimming or removal (01 31 00, 1.8.D).

(d) Whitebark pine: do not begin work until NPS has surveyed and marked the whitebark pine. Fence a 33 ft no-disturbance perimeter at Thumb Creek. At Unnamed Creek, a

Park Representative must be on site for any work within the 33 ft perimeter, with at least one week's notice (01 10 00, 1.9.E.2; Sheets 11 and 16).

(e) Clean tools and equipment completely and pressure wash them with hot water (greater than 102°F) before entering the Park and between work locations. Do not fasten ropes or cables to trees that will remain (01 10 00, 1.6.G and 1.6.M).

Q10. Is the CY quantity in the estimated quantity table provided for the overhang repairs quantity reflective of replacing the entire overhang or is this quantity reflective of isolated repairs?

A10. The quantities (24 CY and 1,750 lb at Thumb Creek; 22 CY and 1,200 lb at Unnamed

Creek) reflect continuous repair for the full length of each bridge, not isolated repairs and not replacement of the entire overhang.

(a) Thumb Creek: Remove and replace the concrete curb on both sides. On the west side only, also remove and replace a strip of the deck overhang up to 1'-6" wide (Sheet 13

(S07) Item 2; Sheet 23).

(b) Unnamed Creek: Remove and replace the concrete curb and a strip of the deck overhang up to 1'-6" wide on both sides (Sheet 18 (S12) Item 2; Sheet 23).

The full overhang (3'-10 1/2" at Thumb Creek and 3'-8 1/2" at Unnamed Creek, Sheets 12 and 17) is not replaced. The Contractor shall sound the concrete to confirm removal limits. If unsound concrete extends beyond the 1'-6" limit, the Contractor shall coordinate with the CO to revise the limits (Sheet 23, Note 2).

Q11. Is there any avg stream flow data for Lava Creek?

A11. Stream flow data for Lava Creek is not available. Lava Creek is a tributary to the Gardiner

River near Mammoth (USGS 06191000).

Q12. There are multiple cleaning/preparation methods listed 09 90 00 – 1. Is a full white blast required or is hand tool preparation acceptable?

A12. A full white metal blast (SSPC-SP 5) is not required anywhere on the project. The required surface preparation depends on the element (09 90 00, 3.3.B.1.a; Sheet 26):

(a) Thumb Creek and Unnamed Creek bridge railings: SSPC-SP 10 near-white blast cleaning, performed off-site after the railings are removed (Sheet 26, Note 8). Hand tool preparation is not acceptable for these railings.

(b) Lava Creek bridge railing: SSPC-SP 2 hand tool cleaning, performed in place, to remove loose mill scale, rust, paint, and contaminants. Existing sound paint not removed is encapsulated by the new paint system.

(c) Lava Creek girder bottom flanges:

Specification 09 90 00, 3.3.A.5 (items to remain in place) does not apply to the Thumb

Creek and Unnamed Creek railings. Their removal is required by the plans (Sheet 23, Note 4; Sheet 26, Note 8).

Q13. Plan S04 note 10 describes removal of deteriorated concrete from abutment bearing seats.

Is this removal of bearing seat at each girder on both sides of bridge or is it isolated to certain girders?

A13. The bearing seat repair applies at both abutments of Lava Creek Bridge (Sheet 7 (S01)

Elevation; Sheet 10 (S04) Item 10; Sheet 21 (T03.30J)). It is not a full replacement of the seat at every girder.

Deteriorated concrete in the approximately 8 in. thick concrete seat on top of the masonry abutment is removed back to sound concrete, wherever deterioration is found. The

Contractor sounds the seats and marks the removal limits for CO approval.

The required 1.5 ft long test section, at a location selected by the CO, establishes how far back from the face solid concrete is found (Sheet 21, Note 4). The 1.5 CY concrete and

100 lb reinforcing quantities are estimated totals for both abutments.

Q14. Is there a specific sequence need for removal and replacement of deteriorated bearing seats? One at a time and can’t proceed until prior seat has properly cured?

A14. Seats do not have to be repaired strictly one at a time. The sequencing requirements are in

Sheet 21 (T03.30J), Notes 1–4:

(a) Complete the 1.5 ft test section before production work (Note 4).

(b) Where deteriorated concrete extends under a bearing location, install temporary support at the front face of the abutment, extending from the steel girder to the channel bottom with a tight fit. Bracing requires CO approval before any concrete under a bearing is removed (Note 1).

(c) No more than two adjacent locations that require bracing may be worked at one time.

Adjacent work, and removal of the temporary bracing, may proceed once the repair reaches 3,800 psi (85% of the required 4,500 psi final strength) (Note 1). Locations that do not require bracing are not subject to this limit.

(d) Submit the concrete placement method for CO approval. Seat concrete must match the original dimensions and provide full contact under the existing bearings (Note 3).

Provide containment to prevent material from entering the waterway (Note 1).