Amendment - 0013 P1241.pdf

AMENDMENT 0013, SOLICITATION NO. N6247325R3443, DESIGN-BUILD MILCON P1241

LOW ALTITUDE RADIO COMMUNICATION SYSTEM (LARCS) COMMUNICATION

TOWERS FOR MARINE AIR GROUND TASK FORCE TRAINING COMMAND (MAGTFTC)

TWENTYNINE PALMS, CA

Date: September 23, 2025

The purpose of this Amendment is to revise the Phase Two RFP Parts 1-6 as follows:

1. Modify the Phase Two Proposal due date as follows:

FROM: 2:00 PM PT on September 25, 2025

TO: 2:00 PM PT on October 2, 2025

2. Modify RFP PART 3, CHAPTER 6, ESR B10 SUPERSTRUCTURE, section for DESIGN AND NEW CONSTRUCTION in response to RFI #10 and #11 as follows:

FROM:

Provide new communication towers in compliance with ANSI/TIA 222-H, Standard for Antennas and the Supporting Structures for Antennas and Small Wind Turbines, including all its addendums. Refer to the Equipment Schedules for New 140-foot Towers in Part 6 of this RFP.

TO:

Provide new communication towers in compliance with ANSI/TIA 222-H, Standard for Antennas and the Supporting Structures for Antennas and Small Wind Turbines, including all its addendums. Refer to the Equipment Schedules for New 140-foot Towers in Part 6 of this RFP.

Provide an allowance for 25% future load increase on the new tower members for structural stress analysis by increasing the equipment size by 25%, thus increasing wind loads which govern the tower design. Equipment weight and location shall remain as noted in the equipment schedule provided in Part 6 Attachments of this RFP.

Provide manufacturers’ recommendations for leg types that will be used for the new towers.

3. Modify RFP PART 3, CHAPTER 6, ESR B10 SUPERSTRUCTURE in response to RFI #12, #13 and #14 as follows:

ADD NEW SECTION:

(after section on GOVERNMENT-PROVIDED STRUCTURAL INFORMATION)

EQUIPMENT SUPPORT AND FALL PROTECTION FOR NEW AND EXISTING TOWERS

Provide detailed engineering drawings for the new ladder and fall protection system, ensuring proper installation, conducting thorough testing and certification of the completed new systems before they are put into service, and meeting all applicable codes and standards.

Provide universal cable ladder on the tower with a minimum of (8) ¾ inch and (7) 7/16-inch holes sufficient to support (16) LARCS Radio cables, (3) LMR cables, and (4) to (6) microwave radio cables as required by NAVSEA Collateral Equipment Design.

Provide standard pole mount for parabolic antennas with a typical 12-inch to 14-inch offset from the tower framing and provide 3-foot to 6-foot offset standoff mounts for omnidirectional antennas.

4. Modify RFP PART 3, CHAPTER 6 ESR B10 SUPERSTRUCTURE, section for REPAIRS AND/ OR UPGRADES TO EXISTING TOWERS in response to RFI #13 and #19 as follows:

FROM:

REPAIRS AND/ OR UPGRADES TO EXISTING TOWERS

Refer to Part 6 of this RFP for past tower structural inspection and analysis reports completed by NAVSEA and to be issued to the Contractor through a separate DVD. All identified deficiencies of each tower in these past reports prepared by NAVSEA shall be completed prior to commencing with any new repair work or installation of equipment on the tower.

The Contractor’s Structural Engineer shall perform additional structural inspections, analyses and design to support and update the repair concept for all existing towers, including both towers at Bearmat Hill. Any additional findings from the Contractor’s investigation shall be included in any new or proposed work on the existing towers. Refer to Part 6 of this RFP for the Equipment Schedules For Existing Towers.

TO:

REPAIRS AND/ OR UPGRADES TO EXISTING TOWERS

Refer to Part 6 of this RFP for past tower structural inspection and analysis reports completed by NAVSEA and to be issued to the Contractor through a separate DVD. All identified deficiencies of each tower in these past reports prepared by NAVSEA shall be completed prior to commencing with any new repair work or installation of equipment on the tower.

The Contractor’s Structural Engineer shall perform additional structural inspections, analyses and design to support and update the repair concept for all existing towers, including both towers at Bearmat Hill. Any additional findings from the Contractor’s investigation shall be included in any new or proposed work on the existing towers. Refer to Part 6 of this RFP for the Equipment Schedules for Existing Towers.

The Contractor’s Design team shall also perform field investigations, provide a report of all existing towers for any additional deleterious conditions and provide recommendations for the mitigation of observed conditions. The Contractor shall provide a Request for Information (RFI) to address any unforeseen conditions to the Contracting Officer.

The Contractor shall provide a comprehensive inspection of the existing tower access elements including the existing step pegs and any existing fall protection system components currently installed on the tower. The Contractor shall reference provided existing reports in Part 6 of this RFP during the inspection process to assess the current condition of these elements and identify any deficiencies, damage, or non-compliance with current safety standards. The Contractor shall perform necessary repairs to the existing fall protection components to address identified deficiencies and improve overall safety.

5. Modify RFP PART 3, CHAPTER 6, ESR B10 SUPERSTRUCTURES, section for DESIGN

AND NEW CONSTRUCTION, paragraph 4 in response to RFI #26 and #32.

FROM:

Design and construct foundations for new collateral equipment designed by NAVSEA and its contractors such shelters, and photovoltaic panels. Refer to Part 6 of this RFP for the NAVSEA Collateral Equipment Design and Structural Calculations for foundation loading.

ADD:

Design and construct foundations for new collateral equipment designed by NAVSEA and its contractors such shelters, photovoltaic panel support structures and the patio stair footers as detailed on S-211 and S-212. Refer to Part 6 of this RFP for the NAVSEA Collateral Equipment Design and Structural Calculations for foundation loading in DOC 10__P1241 Coll Equip Final BOD_App A_Civil-Struct Calcs 20250903.

6. Modify RFP PART 3 CHAPTER 6 ESR B10 SUPERSTRUCTURE, section for DESIGN

AND NEW CONSTRUCTION in response to RFI #52, #56 and #57 as follows:

ADD:

(at the end of the section for DESIGN AND NEW CONSTRUCTION)

Provide all foundations using monolithic concrete placement without cold joints or dowelling between the footing and pedestal. The Designer of Record (DOR) must submit valid justification for Government approval if they are unable to meet this requirement. Refer to the NAVSEA drawing sheet S-501, details D1 and D7, in Part 6 in this RFP.

Provide anchor bolts and base plates for the shelters and solar system structural support that are coordinated with the NAVSEA Collateral Equipment final design drawings and specifications. Provide base plates with non-shrink grout and anchor bolts with leveling nuts and washers for standard vertical and horizontal tolerance adjustments. Refer to Part 6 of this RFP for NAVSEA drawings for coordination.

Provide CMU blocks or any equivalent concrete material as required at all shelter entry doors for ease of access in to and out of the shelters.

7. Modify RFP PART 3 CHAPTER 6 ESR A10 FOUNDATIONS, SYSTEM DESCRIPTION in response to RFI #53 as follows:

FROM:

SYSTEM DESCRIPTION

Provide the building foundation system in accordance with Unified Facilities Criteria (UFC) 3-301-01, Structural Engineering and UFC 3-220-01, Geotechnical Engineering. Design foundations to suit subsurface conditions, capable of transmitting all building loads to the ground.

See Engineering Systems Requirements (ESR) Section B10, Superstructure, for additional loading criteria.

TO:

SYSTEM DESCRIPTION

Provide the building foundation system in accordance with Unified Facilities Criteria (UFC) 3-301-01, Structural Engineering and UFC 3-220-01, Geotechnical Engineering. Design foundations to suit subsurface conditions, capable of transmitting all building loads to the ground.

GOVERNMENT-PROVIDED FOUNDATION INFORMATION

All footings and foundation location are shown schematically to establish scope and general requirements. The NAVSEA Collateral Equipment Design (NAVFAC Concept Drawing) is included in Part 6 of this RFP are issued for bidding purposes only and not intended for construction.

See Engineering Systems Requirements (ESR) Section B10, Superstructure, for additional loading criteria.

8. Modify RFP PART 3 CHAPTER 6 ESR G10 SITE PREPARATION, G103004 FILL&

BORROW in response to RFI #54 as follows:

FROM:

G103004 FILL & BORROW

For cut and backfill spoils in any remote site the material (spoils) to be left on the site where it shall not affect the project site. Contractor shall perform all necessary cut and fill operations to achieve the required grades and elevations. All cut and fill material generated during these operations shall be retained and redistributed on the project site as per of grading plan. Upon completion of the cut and fill operations, the contractor shall ensure that the site is left in a stable, graded condition. Excess spoils from the excavation can be spread evenly matching existing counters and grades. No stockpiling shall be allowed. Crushed aggregate no larger than 3/4" is an acceptable alternative backfill.

TO:

(as paragraph 2)

G103004 FILL & BORROW

For cut and backfill spoils in any remote site the material (spoils) to be left on the site where it shall not affect the project site. Contractor shall perform all necessary cut and fill operations to achieve the required grades and elevations. All cut and fill material generated during these operations shall be retained and redistributed on the project site as per of grading plan. Upon completion of the cut and fill operations, the contractor shall ensure that the site is left in a stable, graded condition. Excess spoils from the excavation can be spread evenly matching existing counters and grades. No stockpiling shall be allowed. Crushed aggregate no larger than 3/4" is an acceptable alternative backfill.

For required cut and fill conditions, native site material may be used. If native site material is reused, the material shall be compacted of 90% relative compaction in accordance with ASTM D1557. Refer to Part 6 of this RFP for the NAVSEA Collateral Equipment Design (NAVFAC Concept Drawing).

NOTES:

1. The offeror must acknowledge receipt of all amendments on the offer schedule.

2. All other paragraphs, provisions, and conditions to this proposed contract remain unchanged.