Replace Foundation Concrete and Anchor Bolts, BAK-12 System

STATEMENT OF WORK REPAIR OF BAK-12 AIRCRAFT ARRESTING SYSTEM BOTTOM SLAB AND ANCHOR BOLT REPLACEMENT at Fresno ANGS August 14, 2026 144TH FIGHTER WING CALIFORNIA AIR NATIONAL GUARD FRESNO AIR NATIONAL GUARD STATION -- 1 of 7 -- STATEMENT OF WORK (SOW) 1.0 GENERAL PROJECT DESCRIPTION This Statement of Work (SOW) defines the requirements for the contractor to repair the concrete foundation slab of the BAK-12 Aircraft Arresting System (AAS) and replaces all eight (8) of its critical foundation anchor bolts. All work under this contract shall be performed at the following location:  Location: Fresno Air National Guard Station, 5323 E. McKinley Ave., Fresno, CA 93727.  Specific Site: Runway Arresting System (BAK-12) pits/slabs, as coordinated and  designated by the Base Civil Engineer (BCE) and Airfield Management. All work must be executed in accordance with Air National Guard Engineering Technical Services (ANGETS), Air National Guard Engineering Technical Letters (ANGETL), Air Force Manual (AFMAN) 32-1040, and the Department of Defense Unified Facilities Criteria (UFC). 2.0 APPLICABLE GOVERNING STANDARDS The Contractor shall perform all work in strict compliance with the latest editions of the following military and federal specifications: Military & Federal Standards  FC 3-260-18F: Air Force Aircraft Arresting Systems (AAS) Installation, Operation, and Maintenance FC 3-260-18F.  AFMAN 32-1040: Civil Engineering Airfield Infrastructure AFMAN 32-1040.  UFC 3-260-01: Airfield and Heliport Planning and Design.  TO 35E8-2-5-1: Operation and Maintenance Instructions – Aircraft Arresting System Model BAK-12.  USAF Standard Drawing Set 67F2013A: BAK-12 Installation Drawings and Concrete Foundations.  USACE EM 385-1-1: Safety and Health Requirements Manual (U.S. Army Corps of Engineers). Industry Standards  ACI 318 / ACI 301: American Concrete Institute Standards for Structural Concrete.  ASTM A615/A615M: Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement.  ASTM F1554: Standard Specification for Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength. -- 2 of 7 --  ASTM C881/C881M: Standard Specification for Epoxy-Resin-Base Bonding Systems for Concrete.  ASTM C309: Standard Specification for Liquid Membrane-Forming Compounds for Curing Concrete. 3.0 SCOPE AND ORDER OF WORK The Contractor shall furnish all labor, materials, equipment, and engineering services required to complete the concrete slab repair and anchor bolt replacement in the following sequential order: Step 1: Saw Cutting the Bottom Slab 1. Marking and Layout: The Contractor shall precisely locate the existing eight (8) anchor bolts on the BAK-12 bottom slab. 2. Perimeter Saw Cutting: The Contractor shall perform full-depth perimeter saw cuts forming an 8-foot by 4-foot (8'x4') rectangular boundary centered directly over the existing anchor bolt configuration to completely envelop all eight existing anchor bolts. 3. Execution Requirements: Saw cuts must be perfectly straight and vertical. Overcutting at corners shall be minimized by auguring a four (4”) inch minimum diameter cylinder the full depth of the existing concrete to prevent propagation cracks in the remaining airfield pavement, complying with ACI standards for pavement repair. Water runoff from the wet-sawing operation must be vacuumed immediately to prevent contamination of the surrounding airfield joint seals, or active pavement. Step 2: Excavation and Base Removal 1. Demolition: The Contractor shall break and remove the existing concrete within the 8'x4' saw-cut perimeter using lightweight handheld jackhammers (not exceeding 40 lbs unless approved by the Base Civil Engineer) to prevent damage to the surrounding structural slab. 2. Excavation Depth: The Contractor shall excavate and remove all concrete debris, underlying aggregate base, and subgrade material to a minimum depth of 2.0 feet (24 inches) below the existing bottom slab's base elevation. 3. Subgrade Preparation: The excavated bottom must be leveled, hand-tamped, and verified for stability. Any soft spots or unsuitable soil must be excavated and replaced with approved compacted crushed aggregate base (CAB) meeting UFC 3-260-01 requirements. Step 3: Drilling and Installing Anchor Dowels 1. Hole Alignment and Layout: The Contractor shall drill dowel holes horizontally into the vertical faces of the remaining existing concrete base. The drilling pattern must be designed to align precisely with the spacing of the existing structural rebar cage. -- 3 of 7 -- 2. Drilling Specifications: Holes shall be drilled using rotary hammer drills. The depth and diameter of the holes must conform to the epoxy manufacturer's requirements for structural load transfer (typically a minimum embedment depth of 10xd, where d is the dowel diameter). 3. Adhesive Doweling: Clean the drilled holes thoroughly using wire brushes and compressed air to remove all dust, laitance, and standing water. Install steel dowels using an approved, high-strength structural epoxy adhesive conforming to ASTM C881 (Type IV, Grade 3, Class B/C). Step 4: Rebar Cage Fabrication 1. Material Standards: Rebar must be deformed steel bars conforming to ASTM A615, Grade 60. 2. Cage Fabrication: The Contractor shall construct a new steel reinforcing cage utilizing #5 rebar. The reinforcement design, spacing, and grid pattern must match the existing structural reinforcing pattern as detailed in USAF Standard Drawing 67F2013A. 3. Installation and Clearances: The cage must be securely tied with 16-gauge tie wire and placed on approved concrete support chairs to ensure a minimum concrete cover of 3 inches from the bottom of the excavation and 2 inches from the saw-cut side walls. Tie the new cage securely to the structural dowels installed in Step 3. Step 5: Setting Eight (8) New BAK-12 Anchor Bolts 1. Anchor Bolt Specifications: The Contractor shall supply eight (8) new high-strength s…