Z--MACA-REPAIR OF PEDESTRIAN BRIDGE FOUNDAT

Questions & Answers / Clarifications

This document provides responses to vendor questions regarding the "REPAIR OF PEDESTRIAN BRIDGE FOUNDATION" opportunity (Solicitation 140P5326Q0017).

• Foundation for Stacking Stone: The SOW has been revised to include details on the foundation type and structure for stacking stone on the bridge piers.
• Stacking Stone Cap: The SOW has been revised to specify the desired finish for the top of the stacked stone.
• Bridge Weight Limits: The Government does not have verified structural load rating documentation for construction equipment. Contractors must assume restricted loading conditions, limiting concentrated loads to 2,500 lbs per wheel/point load (unless approved otherwise), using load distribution mats, and ensuring distributed loads do not exceed 75 psf. Equipment specifications, load calculations, and access plans must be submitted. Articulating boom lifts or suspended basket systems are permitted and encouraged.
• Sandblasting Scope: Sandblasting will be localized to small spots for cracks only, due to the risks associated with visitors. The original scope implying widespread sandblasting has been amended.
• Bridge Surface Material & Sealer: The SOW has been revised to identify the existing material on the bridge beams and specify the desired sealer/finish for the concrete.

Several sections of the Statement of Work (SOW) have been revised based on these questions. Bidders should refer to the updated SOW for definitive requirements regarding foundation details, stone caps, bridge loading, sandblasting, and concrete sealing.

Statement of Work (SOW) / Performance Work Statement (PWS)

To perform cosmetic repairs on the existing concrete foundation supporting the pedestrian bridge at Mammoth Cave National Park. The goal is to preserve aesthetic value, ensure longevity, and mitigate long-term maintenance costs, as the bridge is vital for visitor circulation and interpretive engagement.

• Surface Crack and Spall Repair (Hotel and Visitor Center Sides):

  • Perform visual and acoustic inspections.
  • Mark delaminated areas, shrinkage cracks, and spalls.
  • Inject low-viscosity epoxy for cracks <1/16".
  • Chip out unsound concrete for cracks >1/16" and spalls to a minimum depth of 1.5", prepare the area, and fill with non-shrink, polymer-modified mortar.
  • Moist cure for 72 hours.

• Substructure Repairs Beneath Bridge Span:

  • Mechanically scarify designated zones to a depth of 1/4"-3/8".
  • Install modular formwork for vertical faces.
  • Drill and install #4 epoxy-coated dowels using an epoxy anchoring system.
  • Place high-strength, low-shrink concrete and consolidate with an internal vibrator.
  • Allow to cure for a minimum of 7 days.

• Adhered Stone Veneer System:

  • Install an adhered sandstone veneer system over a prepared cast-in-place concrete substrate.
  • Substrate preparation to achieve a CSP of 5 to 7.
  • Install #4 epoxy-coated reinforcing dowels.
  • Place cast-in-place concrete (4,000 psi at 28 days) and cure for a minimum of 7 days.
  • Prepare and install natural sandstone veneer units (3"-5" nominal thickness) using high-strength adhesive mortar.
  • Install veneer with full contact, maintain coursed pattern, and tool joints.
  • Seal top edges with flexible, waterproof sealant.
  • Apply penetrating silane/siloxane sealer.

• Limestone Cap Installation (Top of Piers/Columns):

  • Provide and install two custom-fabricated limestone caps with a pyramidal profile.
  • Match the profile, color, texture, and finish of adjacent limestone caps.

• Adherence to applicable ACI, ASTM, OSHA, SMACNA, and NPS historical preservation standards.

• Concrete strength verification (4,000 psi).

• Plane tolerance for veneer ±1/8" in 10 ft.

• Joint width for veneer: 1/2"-1".

• Limestone cap tolerance: ±1/8" in 10 ft.

• Project Location: Mammoth Cave National Park, Kentucky.

• Period of Performance: 180 calendar days from Notice to Proceed (NTP).

• Maintain continuous pedestrian access across the bridge for the duration of the project.

• Implement full overhead protection measures to prevent tools, debris, or materials from falling.

• Comply with noise limits, public safety, and protection of natural and cultural resources.

• Work hours: Monday-Friday, 8:00 AM to 5:00 PM, unless otherwise approved.

• Coordinate utility locating prior to concrete coring or substrate penetration.

• Submit project schedule, SSSP, submittal log, bonding documents, and list of subcontractors.

• Mandatory site visit for bidders.

Amendment / Modification

This amendment (0003) to solicitation 140P5326Q0017, effective March 31, 2026, incorporates Government responses to vendor inquiries and issues a revised Statement of Work (SOW).

Key changes include:

• Incorporation of Questions and Answers: Official Q&As are incorporated, addressing topics such as stone stacking foundations, stone cap requirements, bridge loading limitations, sandblasting restrictions, and existing concrete surface treatments. These Q&As are provided as an attachment.

• Revised Statement of Work (SOW): The SOW has been updated to include Government determinations and technical clarifications. Revisions cover:

  • Adhered stone veneer system, substrate preparation, veneer materials, and dowel installation.
  • Limestone cap installation specifications for piers/columns.
  • Clarification of restricted load limits for bridge-mounted construction equipment.
  • Removal of full-surface sandblasting; limited to localized crack repair areas.
  • Concrete sealer requirements and existing surface conditions.
  • Additional details on repair methods, quality control, submittal requirements, and continuous pedestrian access.
  • The revised SOW is issued as an attachment and fully replaces the previous SOW.

• Statement of Work (SOW)

• Questions and Answers

• The proposal due date and evaluation criteria remain unchanged by this amendment.

• All other terms and conditions remain unchanged.

• The Period of Performance is from 05/06/2026 to 10/28/2026.

Amendment / Modification

This amendment (0002) to solicitation 140P5326Q0017 revises the quotation due date and updates the period of performance.

• Quotation Due Date: Extended from April 14, 2026, to May 1, 2026, at 3:00 PM CST.

• Period of Performance (POP): Changed from 04/20/2026 to 10/12/2026, to a new POP of May 6, 2026, to October 28, 2026.

• Quotation due date

• Period of Performance

• Offerors must acknowledge this amendment in their quotation submission.

• The deadline for submitting quotations has been extended.

• The performance period for the contract has been adjusted.

Amendment / Modification

• This amendment (0001) corrects an incorrect date listed for clause 52.236-27 (Site Visit).

• The original date of 3/27/2026 has been corrected to 04/07/2026.

• The Period of Performance has been updated to 04/20/2026 to 10/12/2026.

• Clause 52.236-27 (Site Visit)

• Period of Performance

• The effective date of the amendment is 03/31/2026.

• Bidders must acknowledge receipt of this amendment. Offers must be received prior to the hour and date specified in the solicitation or as amended. Failure to acknowledge may result in rejection of the offer.

Statement of Work (SOW) / Performance Work Statement (PWS)

To perform cosmetic repairs on the concrete foundation of a pedestrian bridge at Mammoth Cave National Park. The goal is to preserve the bridge's aesthetic value, ensure its longevity, and mitigate long-term maintenance costs, as the bridge is vital for visitor circulation and engagement.

• Surface Crack and Spall Repair (663 SF): Includes visual and acoustic inspection, marking delaminated areas, sandblasting surfaces, injecting low-viscosity epoxy for small cracks (<1/16"), and chipping out unsound concrete for larger cracks (>1/16") followed by epoxy bonding agent and non-shrink mortar application.

• Beneath-Bridge Substructure Repairs: Involves mechanical scarification of concrete surfaces (1/4" to 3/8" depth), installation of formwork for vertical overhead surfaces, placement of high-strength concrete, and vibration for consolidation.

• Sandstone Veneer Installation: Application of sandstone veneer on the hotel side (150-200 SF) and alternating retaining wall blocks on the visitor center side (100-150 SF), matching existing materials in pattern, thickness, and texture, using approved adhesives or mechanical anchors.

• All work must comply with applicable ACI, ASTM, OSHA, SMACNA, and NPS historical preservation standards.

• Moist cure for 72 hours per ACI 308 for surface repairs.

• Full cure for beneath-bridge concrete (minimum 7 days at 50°F or above).

• Follow installation per ASTM C1780 and NPS-approved historical standards for veneer.

• Quality assurance testing includes slump tests (ASTM C143) and compression tests (ASTM C39) for poured concrete, and adhesion pull tests for veneer if requested.

• Location: Mammoth Cave National Park, Kentucky.

• Period of Performance: 180 calendar days from the date of Notice to Proceed (NTP), including weather delays and administrative time.

• Maintenance of Pedestrian Access: Continuous pedestrian access must be maintained throughout the project. A minimum unobstructed clear walkway width of 48 inches is required, compliant with ABA/ADA accessibility requirements.

• Protection of Infrastructure: Full overhead protection measures are required to prevent tools and debris from falling onto underlying infrastructure, walkways, or sensitive areas.

• Site Visits: All bidders are required to visit the site.

• Work Hours: Monday through Friday, 8:00 AM to 5:00 PM. No work on Federal holidays or weekends without prior approval.

• Submittals: Contractor must submit shop drawings and product data for crack repair systems, mortar materials, doweling epoxies, sandstone veneer, and anchoring systems.

• Safety Plan: A site-specific Accident Prevention Plan (APP) is required, including hazard identification, emergency procedures, and weekly safety meetings. Appropriate PPE is mandatory.

Form / Attachment / Pricing Sheet

This document, "Attachment 5 — LPTA Technical Acceptability & Price Submission Template (Construction)," is a mandatory template for bidders to complete and submit with their quotation for the "Cosmetic Repair of Pedestrian Bridge Foundation" project at Mammoth Cave National Park, Kentucky (RFQ No.: 140P5326Q0017). It is designed to ensure quotations meet the technical acceptability criteria for a Lowest Price Technically Acceptable (LPTA) award basis.

1. Quoter Information: Requires legal name, UEI, CAGE, primary POC details, email, and phone.
2. Relevant Experience (PASS/FAIL): Bidders must detail two completed projects within the last five years demonstrating specific concrete repair, masonry/veneer installation on bridges or similar structures. All fields for each project (Customer, Location, Relevance, Scope, Timing Evidence, Contract/PO No., POC) must be completed.
3. Key Subcontractor Identification (PASS/FAIL): Identify any specialized subcontractors and their roles if applicable.
4. SOW/Specs Compliance Checklist (PASS/FAIL): A checklist to confirm compliance with specific requirements for concrete crack/spall repair, substructure repairs, sandstone/block veneer installation, Accident Prevention Plan (APP), and general site coordination/restrictions.
5. Proposed Schedule (Required): A schedule demonstrating completion within 165 calendar days from Notice to Proceed, including anticipated start, major milestones, and final completion date.
6. Quoter Certification (Required): Acknowledgment of mandatory project requirements, including continuous pedestrian access and protection of infrastructure below, along with agreement to complete work within 180 calendar days.

Completing this template accurately and thoroughly is critical for a "PASS" rating in technical acceptability. Omission of any required entry will result in a "FAIL" rating, making the bidder ineligible for award. The LPTA evaluation means price is only considered for technically acceptable offers, making this template essential for proposal preparation.

Form / Attachment / Pricing Sheet

This document is a General Decision for wage rates in Kentucky, specifically for highway construction projects. It provides the prevailing wage rates and fringe benefits for various labor classifications in different counties within Kentucky.

• General Decision Number: KY20260040
• State: Kentucky
• Construction Type: Highway
• Counties Covered: A comprehensive list of Kentucky counties is provided, with specific breakdowns for different labor classifications.
• Labor Classifications: Includes rates for Bricklayers, Carpenters, Divers, Piledrivermen, Electricians, Power Equipment Operators, Ironworkers, Laborers (Groups 1-4), Painters (various specialties), Plumbers/Steamfitters, and Truck Drivers (various zones and groups).
• Rates and Fringes: For each classification and county group, specific hourly wage rates and fringe benefit amounts are listed.
• Effective Dates: Each wage determination has an associated effective date.

This document is crucial for bidders to accurately estimate labor costs for any construction project falling under this wage determination. It ensures compliance with federal labor laws by specifying the minimum wages and fringe benefits that must be paid to laborers and mechanics employed on the project. Bidders must consult this document to ensure their proposals include the correct labor costs, which can significantly impact the overall bid price and project profitability.

Solicitation / RFP / RFQ

This solicitation is for the "Cosmetic Repair of Pedestrian Bridge Foundation" at Mammoth Cave National Park, Kentucky. The work includes inspection, preparation, and repair of cracks and spalls on hotel and visitor center sides (approx. 663 SF), beneath-bridge substructure concrete repairs with doweling and high-strength concrete, and installation of matching sandstone veneer and retaining wall blocks.

• Cosmetic repair of pedestrian bridge foundation.

• Inspection, preparation, and repair of cracks and spalls.

• Substructure concrete repairs with doweling and high-strength concrete.

• Installation of matching sandstone veneer and retaining wall blocks.

• Work must be in accordance with Attachment 1 MACA_337611A_SOW (Statement of Work).

• Contract Type: Firm-Fixed-Price.

• Period of Performance: 165 calendar days from notice to proceed.

• Estimated Value: Not explicitly stated, but the NAICS code is 237310 (Ready-Mix Concrete Manufacturing) with a small business size standard of $45 Million.

• Proposal Submission Deadline: April 14, 2026, by 3:00 PM CST, submitted via email to arcoiris_cuetara-higa@ios.doi.gov.

• Evaluation Criteria: Lowest Price Technically Acceptable (LPTA). Award will be made to the responsible small business quoter whose quotation is determined Technically Acceptable (PASS) and whose total evaluated price is the lowest and determined fair and reasonable.

• Technical Acceptability: Evaluated based on Attachment 3 (LPTA Technical Acceptability & Price Submission Template), requiring details on two relevant projects, subcontractor identification, SOW/specs compliance, and proposed schedule.

• Site Visit: Scheduled for March 27, 2026, at 10:00 AM CST at Mammoth Cave National Park, Kentucky.

• This acquisition is a Total Small Business Set-Aside.

• Offerors must submit a signed SF 1442 and acknowledge all amendments.

• Performance and Payment Bonds are required (15 calendar days).

• Sealed offers must be marked with solicitation number and offeror's information.

• Offers must be valid for 150 days after the due date.

Form / Attachment / Pricing Sheet

This document provides a template for reporting on the "Limitation on Subcontracting" requirements. It is designed to help contractors track and report the amounts paid to subcontractors, distinguishing between similarly situated (SSS) and non-similarly situated (NSS) subcontractors.

• Contract Information: Fields for Contract Number (PIID), Type of Set Aside, and Total Contract Value.
• Performance Period: Dates for which the report is being submitted.
• Amount Paid: Sections to detail amounts paid to the prime contractor, SSS, and NSS.
• Limitation on Subcontracting Percentage Calculation: A formula is provided to calculate the percentage of work performed by the prime contractor relative to total subcontracted work.

Bidders should use this template to understand the reporting requirements related to subcontracting limitations. It helps in planning how to meet these requirements and in preparing the necessary documentation if awarded the contract. The template outlines the specific data points that will need to be tracked and reported throughout the contract's performance period.

Form / Attachment / Pricing Sheet

This document provides information regarding the Federal Acquisition Regulation (FAR) 36.211(b) requirement for agencies to supply details on policies and procedures for the definitization of equitable adjustments for change orders under construction contracts, as well as data on the time required for such definitization.

• Reference to FAR 36.211(b).
• Requirement for agencies to provide specific information on construction contract change order definitization.
• A URL is provided for accessing this information: https://www.doi.gov/pam/acquisition/policy/constructioncontract.

Bidders interested in construction contracts should review the linked information to understand the agency's policies and procedures related to equitable adjustments for change orders. This may impact how change orders are handled and the timelines involved in their definitization, which could be relevant for proposal preparation and contract administration considerations.