SOW VBDZ252107 Storm Pipe Repair 20 AUG 25.docx

STATEMENT OF WORK

Project Number VBDZ252107

Storm Pipe

DESCRIPTION:

An approximately 110ft long storm drain has collapsed, creating sinkholes. The storm drain is approximately 2’ in diameter (contractor shall field verify). The storm drain is approximately 5 feet underground on one end and about 2 feet on the other end. The camera scan shows multiple materials, indicating that sections of the pipe have been replaced before. Multiple utilities are present in the area and cross over the pipe. Extreme care shall be taken.

Storm pipe Sinkholes Storm manhole Sewer manhole

1. BASESCOPE

1.1. STORM PIPE REPLACEMENT

1.1.1. Contractor shall fill out the dig permit a week before starting the work. The paperwork includes calling Dig Safe and Base’s internal procedures.

1.1.1.1. Multiple utilities are in the area. See the utilities figures below.

1.1.2. Contractor shall excavate the entire length of the pipe between the two manholes and remove the pipe. The pipe is formed by multiple sections of concrete and plastic pipes. Extreme care shall be taken not to damage the crossing utility lines. Figures below show the utilities locations.

1.1.3. The width of trenches at any point below the top of the pipe shall be not greater than the outside diameter of the pipe plus 12 inches to permit satisfactory jointing and thorough tamping of the bedding material under and around the pipe. Sheeting and bracing, where required, shall be placed within the trench width, without any overexcavation.

1.1.4. The Contractor is responsible for the movement of construction machinery and equipment over pipes and utilities during construction. Excavation made with power-driven equipment is not permitted within 2 feet of known utility or subsurface construction. For work immediately adjacent to or for excavations exposing a utility or other buried obstruction, excavate by hand. Start hand excavation on each side of the indicated obstruction and continue until the obstruction is uncovered or until clearance for the new grade is assured. Support uncovered lines or other existing work affected by the contract excavation until approval for backfill is granted by the Contracting Officer. Report damage to utility lines or subsurface construction immediately to the Contracting Officer.

1.1.5. Grade the bottoms of trenches accurately to provide uniform bearing and support for the bottom quadrant of each section of the pipe. Excavate bell holes to the necessary size at each joint or coupling to eliminate point bearing. Remove stones of 3 inches or greater in any dimension, or as recommended by the pipe manufacturer, whichever is smaller, to avoid point bearing.

1.1.6. Where wet or otherwise unstable soil incapable of properly supporting the pipe, as determined by the Contracting Officer, is unexpectedly encountered at the bottom of a trench, such material shall be removed to the depth required and replaced to the proper grade with select granular material.

1.1.7. The bedding surface for the pipe shall provide a firm foundation of uniform density throughout the entire length of the pipe.

1.1.8. Use Class IB or II material for bedding, haunching, and initial backfill. Use Class I, II, or III material for PP pipe bedding, haunching and initial backfill.

1.1.9. After the pipe has been properly bedded, selected material from excavation or borrow, at a moisture content that will facilitate compaction, shall be placed along both sides of the pipe in layers not exceeding 6 inches in compacted depth. The backfill shall be brought up evenly on both sides of the pipe for the full length of the pipe. The fill shall be thoroughly compacted under the haunches of the pipe. Each layer shall be thoroughly compacted with mechanical tampers or rammers. This method of filling and compacting shall continue until the fill has reached an elevation equal to the midpoint (spring line) of the concrete pipe or has reached an elevation of at least 12 inches above the top of the pipe for flexible pipe. The remainder of the trench shall be backfilled and compacted by spreading and rolling or compacted by mechanical rammers or tampers in layers not exceeding 8 inches. Tests for density shall be made as necessary to ensure conformance to the compaction requirements specified below. Where it is necessary, in the opinion of the Contracting Officer, that sheeting or portions of bracing be left in place, the contract will be adjusted accordingly. Untreated sheeting shall not be left in place beneath structures or pavements.

1.1.10. Compaction density shall be not less than 90 percent of maximum density for cohesive material and 95 percent of maximum density for cohesionless material.

1.1.11. The new pipe shall be free of defects.

1.1.12. Protect storm drainage piping and adjacent areas from superimposed and external loads during construction.

1.1.13. Joints shall be solvent cement or elastomeric gasket type by the specification for the pipe and as recommended by the pipe manufacturer.

1.1.14. The pipe connection to the manhole shall be properly sealed to avoid any soil and backfill from washing in.

1.1.15. Provide metallic core or metallic-faced, acid- and alkali-resistant, polyethylene plastic warning tape manufactured specifically for warning and identification of buried utility lines. Provide tape on rolls, 3 inches minimum width, color coded as specified below for the intended utility with warning and identification imprinted in bold black letters continuously over the entire tape length. Warning and identification to read, "CAUTION, BURIED WATER LINE BELOW" or similar wording. Provide permanent color and printing, unaffected by moisture or soil.

1.1.16. Provide polyethylene plastic tape conforming to the width, color, and printing requirements specified above, with a minimum thickness of 0.004 inch, and a minimum strength of 1500 psi lengthwise and 1250 psi crosswise. Manufacture tape with integral wires, foil backing, or other means of enabling detection by a metal detector when the tape is buried up to 3 feet deep. Encase the metallic element of the tape in a protective jacket or provide it with other means of corrosion protection.

1.1.17. Pave over the pipe per the Asphalt Pavement Section figure below.

1.2. MANHOLES REPAIRS (STORM AND SANITARY)

1.2.1. Repair the stormwater manhole where the storm pipe connects to the basin. This is the manhole connecting to the storm pipe that is being replaced, but the repair is on the other side.

Repair area

1.2.2. Excavate the area where the manhole has formed and fill it out with gravel.

1.2.3. Pave over the repaired area per the Asphalt Pavement Section figure below.

1.2.4. Repair/modify the sewer junction manhole by creating an individual channel for each inlet pipe into the main sewer line outlet. Currently, the manhole creates a whirl effect, slowing down the flow.

1.2.4.1. No sharp turns allowed. All turns shall be smooth transitions.

1.2.4.2. Maintain as much as possible the separation between channels. Currently, all three channels join too early, creating a space for a whirl.

1.2.4.3. Elevate some channels may be necessary to follow best practices.

OPTION 1: ISLAND REMOVAL

2.

2.1. Remove and dispose of the islands shown in the photos below. The island area is about 2,000 SF. Contractor shall field verify.

2.2. Extreme care shall be taken not to damage any utilities under the island. The utilities maps are provided below.

2.3. Asphalt, basecourse, and subgrade shall follow the diagram below.

2.4. Tack coat shall be applied between pavement courses as well as pavement lifts.

2.5. The sanitary manhole will need to be reduced to the pavement level. Currently, the manhole has two riser rings.

2.6. New pavement shall slope to meet the existing pavement.

2.7. Contractor shall paint the contour of the island and parking spots.

New Asphalt Pavement Section

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Communication Lines

3. CONTRACTOR REQUIREMENTS

3.1. The contractor shall comply with all applicable installation/facility access and local security policies and procedures, which may be obtained from the Contracting Officer’s Representative (COR). The contractor shall also provide all information required for background checks to meet installation access requirements to be accomplished by the local installation’s Security Forces, Director of Emergency Services or local Security Office. The contractor shall ensure compliance with all personal identity verification requirements as directed by DoD, HAF and/or local policy. Should the Force Protection Condition (FPCON) change, the Government may require changes in contractor security matters or processes.

3.2. Contractor and all associated sub-contractors employees shall comply with adjudication standards and procedures using the National Crime Information Center Interstate Identification Index (NCIC-III) and Terrorist Screening Database (TSDB) (AFI 31-101 and AFI 10-245), applicable installation, facility and area commander installation/facility access and local security policies and procedures (provided by government representative), or, at OCONUS locations, in accordance with status of forces agreements and other theater regulations.

3.3. All contractor employees, to include subcontractor employees, requiring access to Government Installations, Facilities and Controlled Access areas shall complete AT Level I awareness training within 10 calendar days after contract start date or effective date of incorporation of this requirement into the contract, whichever is applicable. Certificates of completion for each affected contractor employee and subcontractor employee will be maintained by the COR or Antiterrorism Representative. AT level I Awareness Training is available through MyLearning by completing the Force Protection CBT. For Contractors that do not require issuance of a CAC, local training will be provided during badge issuance at SFS via informational binder.

3.4. Requirement for OPSEC Training. In accordance with AFI 10-701, Operations Security, OPSEC PMs/SMO/SMNCOs/Coordinators will provide OPSEC training or training materials to contract employees within 90 days of employees’ initial assignment to the contract and annually thereafter. General organizational orientations may need to be supplemented by duty-related orientations in the work center targeted toward specific critical information and vulnerabilities associated with the work. Initial training (OPSE 1301 - OPSEC Fundamentals) and refresher training (Protecting Sensitive Information) are both available on the MyLearning website. For Contractors that do not require issuance of a CAC, local training will be provided during badge issuance at SFS via informational binder.

3.5. The use and possession of controlled substances to include marijuana (medical or recreational use) on the installation is in violation of Title 10 US Code 912a. Art 112a. Contractors are notified this policy is strictly enforced and violators will be denied entry. Personnel caught on the installation can be prosecuted.

3.6. The Contractor shall provide all personnel and necessary equipment to establish an adequate and safe work zone.

3.7. Contractor is responsible for site cleanliness.

3.8. The Contractor shall bring any unforeseen project conditions to the attention of the COR immediately. Differing site conditions, which may alter the scope of work, shall be approved by the contracting officer (KO) prior to such work being performed.

3.9. The Contractor must get approval from the COR prior to any utility shutdowns. (do not have contractor contact production control directly)

3.10. The Contractor shall notify the COR prior to delivery of any material or equipment to the site. The contractor shall ensure someone is available to receive delivered materials and able to store them safely in an area to be coordinated with the government project manager. Any materials delivered without prior coordination and without having someone to take receipt, shall not be accepted and turned away.

3.11. Contractor hours are 0700-1530 Monday through Friday, excluding Government holidays.

4. PROPOSED PROJECT SCHEDULE

The project will begin 14 days following the Notice to Proceed. The project shall be completed within 90 days following the notice to proceed.

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