DPW-10016-2J_-_SOW.pdf

DPW-10016-2J

Roof Repair

Building 2201

Scope of Work

(3 August 2016)

The Contractor shall provide all labor, materials, shipping, storage, and transportation as required to perform all work in accordance with these specifications, commercial practices and industry standards. All work shall be accomplished in accordance with applicable federal, state, and local regulations. Work includes but is not limited to the following:

Mow grass short on the earth covered ammunition bunker, Building 2201. Rake up all grass and dispose of in approved location.

Haul and place material on Building 2201 from the “Soil Stockpile” on Fort Wainwright to fill all holes and grade to Typical Section shown on plans. See Elevation View and Plan View for area on Building 2201 to receive fill and regrade. A minimum of two feet of earth cover is required over the ammunition bunker. It is estimated approximately 325 CY of fill is to be placed and graded on the earth covered ammunition bunker. The existing grade varies with some low spots being over one foot beneath the top of the concrete headwalls, while in other areas only three inches. This will require the Contractor to shape the existing surface in coordination with placement of fill to meet the desired grade.

On the 1-1/2 : 1 fore slopes on average approximately six inches of fill will be placed and graded to the Typical Section detail. The flatter section of the roof starting at the hinge point shall receive on average approximately six inches of fill material increasing to provide for a 4% crown as shown on the Typical Section detail. Measurement of fill is based on placed and compacted material as shown on the Typical Section detail. On either end of the ammunition bunker the grade shall be warped to keep top of fill six inches below the top of the concrete header and headwalls. This is to keep drainage from flowing over the top of the headwalls and to provide for the CSPE geomembrane concrete anchor attachment hardware to attach to the inside vertical face of the concrete header and headwall.

Compaction and surface preparation will be provided to maintain structural integrity and avoid erosion. A large vibratory drum roller shall not be used over the earth covered magazine for compaction.

There are existing pipe vents penetrating through the surface and a lightning protection system. Contractor shall conduct work in a manner to protect existing structure and all existing utilities from any damage. Should any damage occur to existing structure or utilities by the Contractor, the Contractor shall repair at his expense to new or pre-damaged condition.

Provide and install a Layfield chlorosulfonated polyethylene (CSPE) geomembrane or approved equal over the graded earth covered ammunition bunker. See Elevation View and Plan View for size and dimensions of CSPE geomembrane required. The approximate size is 142’ long x 85’ wide. The CSPE geomembrane shall be attached to the earth covered ammunition storage bunker as detailed in the Concrete Anchor Bar detail and the Anchor Trench detail.

MATERIALS:

Fill material will be reasonably cohesive (solid or wet clay or similar types of soil may not be used as they are too cohesive). It shall be free from deleterious organic matter, trash, debris, and stones heavier than 10 pounds or larger than 6 inches in diameter.

The geomembrane shall meet the following specifications:

ASTM M-284 M-954

Total Plies 3 3

Thickness (Nominal) D751 45 mil 45 mil

Tensile Strength D751 250 lbs 250 lbs

Elongation D751 60% 60%

Puncture FTMS101 (2031) 225 lbs 225 lbs

Ozone Resistance D1149 No Effect No Effect

Hydrostatic Pressure D751A 350 psi 375 psi

Tear Strength D751 Tongue 80 lbs 80 lbs

Low Temperature D2136 -40 F -40 F

ASTM M-284 M-954

Heat Bonded

Seam Strength D7749 225 lbs 225 lbs

Heat Bonded

Peel Adhesion D7747 Film Tear Bond Film Tear Bond

ASTM M-284 M-954

Heat Bonded

Seam Strength D7749 225 lbs 225 lbs

Heat Bonded

Peel Adhesion D7747 Film Tear Bond Film Tear Bond

CSPE Minimum Material Properties

CSPE Minimum Shop Seam Strengths

CSPE Minimum Field Seam Strengths

The geotextile fabric shall meet the following material requirements:

ASTM LP10 LP12

Grab Tensile (lbs) D4632 250 300

Elongation (%) D4632 50 50

Tear (lbs) D4533 100 115

CBR Punc (lbs) D6241 650 790

AOS (sieve) D4751 100 100

Permittivity (sec-1) D4491 0.8 0.8

Water Flow

(gpm/ft^2) D4491 75 65

UV (500hrs) D4355 70% 70%

Roll Size (ft) 15 x 300 15 x 300

Roll Weight (lbs) 308 400

Non-Woven Needle-Punched Geotextiles

FABRICATION

1. Set Up

1. Carefully transfer rolls of geomembrane from storage to unwinding rack.

2. The floor or table must be clean, dry, and free of foreign objects that could damage the liner.

3. Pull panels to specified length, after double-checking dimensions on the work order.

4. Ensure seaming equipment is in good repair and functioning properly.

Ensure equipment is adjusted to the material.

5. Follow documented hot wedge welding prodecures.

2. Qualification Seam

1. A qualification seam will be run prior to any fabrication.

2. The qualification seam must be run using the same material and equipment that will be used for fabrication.

3. Machine conditions and operator used for fabrication must be the same as those used for the qualification weld.

4. Qualification seam must be tested in shear and peel and meet the specificed requirements for the material as stated in the materials section.

5. A qualification seam must be rerun whenever the operator is changed, the equipment adjusted, shift changed, or if the equipment is idle for more than 2 hours.

3. Fabrication Seams

1. Fabrication seams must meet the specified requirements in peel and shear for the material.

2. Fabrication seams will be destructively tested in shear and peel according to

ASTM D6392.

3. Test one specimen each in peel and shear on the first and last welded panel, and,

4. Test one specimen each in peel and shear for every 1000 lineal feet of welding

5. A record of the seam test results is maintained on the Shop QC report.

6. The seaming process must be constantly supervised by the equipment operator.

100 % of the fabrication seams must be visually inspected during seaming.

4. Protection from Damage

1. Protect completed panels from damage

2. Handle carefully to avoid damaging the liner

5. Packaging

1. Each panel will be accordion folded in one direction, and rolled or folded in the other direction.

2. Wrap completed panels in a weather resistant, opaque cover material.

3. Hold wrapper securely in place using UV resistant tape or other secure method.

4. Label the packaged liner to clearly show:

a. Material type

b. Dimensions

c. Stock code

d. Sales order number

e. QC number

f. Panel number

g. Unfolding and deployment directions

DELIVERY STORAGE AND PROTECTION

1. Shipping

1. Completed panels will be placed on clean, serviceable pallets, free from exposed nails or other obstructions.

2. A layer of geomembrane, geotextile, or wood will be placed on all pallets to protect the panel from damage.

3. Secure panels to the pallet using metal or plastic bands. Use a layer of geomembrane between the packaged liner and the band to prevent damage to the liner as the band is tightened.

4. The packaged liner must not extend beyond the outer edges of the pallet.

Use larger pallets or a layer of plywood to extend the pallet edges to match the liner.

5. Carefully handle and place on the truck to avoid damage to the liner.

6. Do not stack panels. Panels may be stacked not more that two high.

2. Delivery

1. All panels will be inspected for damage on delivery.

2. Use suitable unloading equipment to handle panels. Do not drag, slide, or drop panels during unloading.

3. Place panels in a prepared area away from soft ground, standing water, or other deleterious surfaces.

4. Replace any pallets that may become damaged during shipping or handling.

5. Store liner panels in a secure area protected from extremes of heat or cold.

6. Protect panels from damage prior to use.

ACCESSORIES

1. Preformed Pipe Boots will be formed in the field from the same formulation as the geomembrane.

2. Adhesive: All seaming and sealing adhesives shall be of a type or types recommended by the Manufacturer of the fabric-reinforced Hypalon for use with its material and shall be delivered in original sealed containers each with an indelible label bearing the brand name, Manufacturer's name, date of manufacture, and complete directions as to proper storage, use, and application of adhesives.

3. All seaming adhesives shall be the same color as the top ply of the Hypalon material being seamed. Seaming, splicing, sealing and patching adhesive shall be a "compound filled adhesive" which is a high-solids (nominally 15%) solution of the same compound used in the parent sheet in a solvent approved for use in potable water applications. This adhesive shall be used for all specifically designated factory and all field Hypalon-to-Hypalon bonds. This adhesive is also referred to as a "solvent welding solution".

4. Pre-wash Solvent: Solvent for pre-washing/cleaning surfaces for field seams and other similar uses shall be as recommended by the Manufacturer of the fabric-reinforced Hypalon and suitable for use with potable water-grade Hypalon. Unless otherwise specified, xylene is specified for this use.

5. All penetrations through CSPE membrane shall be sealed as shown in the pipe penetration detail.

INSTALLER

1. An installer approved by the manufacturer of the CSPE geomembrane.

PREPARATION

1. Ensure subgrade is compacted and surface finished to not impair installed membrane.

2. Prepare subgrade to provide firm, unyielding surface with no sharp changes or abrupt breaks in grade. A smooth drum rolled surface is preferable.

3. Ensure surfaces to be lined are smooth, free of foreign and organic material, sharp objects, or debris of any kind.

4. A suitable cushion layer of nonwoven geotextile shall be placed prior to liner placement.

5. Excavate anchor trench to line, grade, and width indicated on drawings, prior to liner placement. Provide slightly rounded corners in the trench to avoid sharp bends in the geomembrane.

6. Prepare mechanical attachments according to ASTM D6497 Standard Guide for Mechanical Attachment of Geomembrane to Penetrations or Structures.

7. All concrete surfaces to which the liner will attach shall have “smooth trowel” finish. All the corners should have radius to a minimum 25mm (1 inch) as per the drawing.

8. Compaction at pipe penetrations and areas of mechanical attachment will be inspected carefully as these are areas where differential settlement can occur.

9. A certificate of subgrade acceptance will be prepared by the liner installation contractor prior to liner installation.

INSTALLATION

1. Installation of the geomembrane shall be performed in a logical sequence.

2. Place panels according to the drawings, the panel layout, and the label on each panel.

3. Sufficient thermal slack shall be incorporated during placement to ensure that harmful stresses do not occur in service.

4. Weather Conditions at Time of Installation:

a. Site welding may proceed at any temperature providing a suitable qualification weld can be prepared at site conditions using the operator, equipment, and materials intended for the project.

b. Installation of membrane in winds above 12 mph can proceed only if the installer can demonstrate that the liner will not be at risk of damage.

c. Do not install membrane during precipitation or in the presence of excessive moisture.

d. Do not install in weather conditions that may be detrimental to the function of the membrane.

5. Ensure personnel working on geomembrane do not use damaging footwear.

6. Protect completed panels from damage; handle carefully to avoid damaging the liner.

7. Equipment and methods used to unroll liner panels should not damage the prepared subgrade.

8. Ballast used to prevent uplift by wind must not damage the geomembrane.

A continuous load is recommended along the edges of panels to eliminate the risk of wind uplift.

9. Qualification Seams

a. A qualification seam will be run prior to any field seams.

b. A qualification seam is made with separate pieces of geomembrane using the same material and equipment that will be used for production welding.

c. Machine conditions, and operator used for welding must be the same as those used for the qualification weld.

d. Qualification seam must be tested in shear and peel, and meet the specified requirements for the material as stated in the materials section.

e. A qualification seam must be rerun whenever the operator is changed, the equipment adjusted, or at least every 4 hours.

10. Field Seams

1. Field seams will be sampled for testing in a way that does not compromise the installed liner

a. One sample to be tested for every 500 ft of field seam

b. Test samples are to be removed from the ends of seams, from the anchor trench, or other location that does not introduce a defect into the liner.

c. Samples to be approximately 4 inches long to permit testing of one shear and two peel specimens (ASTM D6392).

d. Test samples immediately after seaming

e. Record date, location and pass/fail description

2. Field seams must meet the specified requirements in peel and shear for the material.

3. A written record will be maintained for all field seam tests.

4. All completed field seams will be 100% non-destructively tested using an air lance test (ASTM D4437 method 7.2).

11. Anchoring

1. The CSPE geomembrane at the toe of the 1-1/2 : 1 slope shall be anchored using the bottom of slope Anchor Trench detail.

2. The CSPE geomembrane along the concrete header and headwalls of the earth covered ammunition bunker shall be anchored using the Concrete Anchor Bar detail.

TOLERANCES

1. Seam Tests:

1. Follow the procedure in ASTM D6392

2. Test three specimens per sampling point, one in shear and two in peel.

a. All specimens to meet seam strength requirements

3. Procedures for Destructive Test Failure:

a. Cut out seam and re-weld; or,

b. Retrace welding path to 10 feet from location of failed test. Take sample for additional test. If passed chemical weld the patch between failed location and original failed location.

REPAIR

1. Inspect seams and non-seam areas for defects, holes, blisters, undispersed raw materials.

2. Identify any sign of foreign matter contamination.

3. Repair all through-thickness defects.

4. Defective Seams: Cap strip or replace.

5. Small Holes: Repair by extrusion welding using a bead of extruded material over hole. Patch if hole is larger than 1/4 inch.

6. Tears: Patch and seal round sharp ends of tears on slope or stressed area prior to patching.

7. Repair blisters, large cuts and undispersed raw materials with patch.

8. Secure Patches by Chemical Welding only:

1. Chemical Weld

a. Follow the instructions supplied with the adhesive.

b. Align the patch on the damaged area, ensuring that it conforms to the bonding surface. Apply solvent with a brush between the damaged material and the patch material.

c. Roll out the patch from the center to the edges using a small roller, or press the patch down and smooth using a rag.

9. Patches: Round or oval, of same geomembrane. Extend minimum 3 inches beyond the edge of the defect.

10. Verification of Repairs: All repairs to be non-destructively tested using

1. Air Lance Test, ASTM D4437 Method 7.2

2. Vacuum Box Test ASTM D5641

11. Redo failed repairs and re-test.

12. Keep records of all repairs and the results of repair testing.

CLEANING

1. Section 01 74 00.

2. Cleaning solvents shall not be used unless product is approved by membrane manufacturer.

3. Use water and rags for all cleaning. If soap is used for cleaning rinse with clean water and dry before welding.

PROTECTION OF FINISHED WORK

1. Section 01 45 00: Protecting installed work.

2. Protect finished Work from damage. See instructions on backfilling if applicable.

Performance Requirements:

The period of performance shall be 60 days.

CSPE geomembrane to remain flexible throughout service life.

The Contractor shall accept directions only from the Regional Contracting Office- Alaska (RCO-AK) Contracting Officer (KO). Requests or desires of the users or using agency made directly to the Contractor will be immediately brought to the attention of the KO, and the Contracting Officer’s Representative (COR) if applicable. Any changes to the project scope or other provisions of the SOW must be authorized in writing by the KO.

The Contractor has salvage rights

The finished product and all of its components shall be constructed and assembled to handle the environment in which it is installed.

The Contractor will contact and verify with all necessary material suppliers; a secure date when materials will be on hand to complete this project prior to submitting your bid on this project.

The Contractor shall make a reasonable effort to verify dimensions and shall examine the project to become aware of the existing conditions and difficulties involved in the completion of the work in accordance with the Scope of Work prior to the submission of your bid and commencement of work.

When the contractor requests approval of substitute materials and/or equipment, it shall be understood and agreed that such substitution, if approved, will be made without cost to the government, regardless of changes in connections, spacing, electrical service, and all other appurtenances.

Anything mentioned in the Scope of Work and not shown on the drawings, or shown on the drawings and not mentioned in the Scope of Work, shall be of like effect as if shown or mentioned in both.

The Contractor shall perform all activities so as to avoid interference with operations of the facility and the work of others.

All wall and ceiling penetrations will be sealed.

The completed project will provide a complete functional system.

Contractor shall verify all equipment operational and insure your quality control inspections and corrections have been accomplished before calling FM for the final inspection!

The completed installation shall comply with all applicable provisions of the NEC, UBC, UPC and the SOW (Drawings and Specifications), enclosed and/or attached.

The POC for the building for access issues will be Mark Renner at (907) 353-2006.

References in specifications to any brand name equipment or material shall be regarded as establishing a standard of quality and shall not be construed as limiting competition. The Contractor may submit proposed equal equipment and/or materials for Government consideration during the submittal process of the contract.

Conflict and/or clarity issues in reference to items, descriptions or drawings within and of this scope of work will be resolved with the writer of this scope.

Upon award of the contract, contractor shall meet with Facility Management staff for a Pre-Con meeting, before beginning work. POC is Clarence G. Baysinger, PE at 361- 4750, e-mail at clarence.g.baysinger.civ@mail.mil . Alternate POC is Miles Illichman at 361-7396.

SCHEDULE: This project is a Firm Fixed Price order. Work shall commence immediately. Proposed schedule shall be submitted with the proposal. Schedule shall be sequenced as directed. Exact schedule shall be submitted immediately following the PRECON (this schedule must be fully coordinated with the user). Period of performance shall be sixty (60) days taking into account the CSPE geomembrane will have to be ordered. The CSPE geomembrane installation shall be completed before sub-zero temperatures are present. Invoices for partial payment shall be based on the mailto:clarence.g.baysinger.civ@mail.mil schedule of values submitted by the contractor with the proposal. (See FWA DPW Design and Construction Guide)

OCCUPANCY: The building included in the scope of this contract will be occupied.

The Contractor will schedule and perform work under this contract in such a manner as to allow the occupants of the building to continue their normal activities with the least amount of interference. Access on either end of the building through the man doors and garage doors must be maintained.

WORKMANSHIP: All work will be performed by certified personnel, as applicable. An approved fabricator shall fabricate CSPE geomembrane. The installer shall be an approved installer by the manufacturer of the CSPE geomembrane. All required training and certification costs will be paid by the Contractor.

CLEAN UP: All trash will be removed from the site on a daily basis. Upon completion of the project, all equipment, materials and any other items associated with the project will be removed from the project site. The site will be left clean.

UTILITIES: Where available, on-site utilities will be provided at no cost to the Contractor. These utilities will be used only in performance of and in support of the project. Any temporary connection to the utility system will be coordinated with the contracting officer’s representative prior to hook-up. The temporary connection will be done by the contractor in a professional manner. Temporary connections will be removed at project completion. Temporary connections will be paid for by the Contractor.

STORAGE AREAS: The Contractor and the Contracting Officer’s Representative will agree on temporary storage areas in the general location of the project. Request for storage area shall be submitted with the proposal package. The contractor will be responsible for the security and maintenance associated with the storage area. Storage areas will be kept clean and in a non-cluttered appearance at all times. If the storage area is not maintained, the Contracting Officer may direct the contractor to move his storage off Post.

CONTROLLED AREAS: The Contractor will be escorted for any and all work performed in controlled or secured areas. The escort will be provided for the Contractor by the occupant of the facility requiring the work. The hours for the Ammo Depot the Contractor will have to work within are 0700-1600 Monday through Thursday and 0700-1500 on Friday.

WASTE DISPOSAL AND BORROW PITS: Comply with the Fort Wainwright Waste Disposal/Borrow Pit Plan and submit a project specific Environmental Protection/Borrow Pit Plan.

WARRANTY REQUIREMENTS: Work performed under this contract will be warranted as follows: The Contractor shall be responsible for any and all damage incidental to construction from issuance of NOTICE TO PROCEED to FINAL

ACCEPTANCE.

The CSPE geomembrane shall have a manufacturer’s pro-rated weathering warranty for thirty (30) years. All other work shall be warrantied for one year from date of final acceptance.

QUALITY CONTROL: Contractor shall provide Quality Control. The government’s Quality Assurance (QA) individual shall work closely with the Contractor’s QC individual to ensure all contract requirements are included.

In the event of a conflict with industry standards, project specifications take precedence.

Fabricator to be ISO 9001 registered or follow ISO 9001 compliant procedures.

Installer to follow documented installation plan and work procedures.

Required submittals:

With proposal:

Catalog cuts (Everything needed in project) Tentative project schedule with Schedule of Values Quality Control and Safety Plans Storm Water Pollution Prevention Plan Construction Schedule

Submittals required prior to start of construction (normally at the PRECON) shall include:

Specification sheets for geomembrane Specification sheets for geotextile CSPE Geomembrane Approved Installer’s Certification Specification sheets for 3/8” x 3-3/4” 304 Stainless Steel Wedge Anchors Specification sheets for ¼” x 2” 304 Stainless Steel Batten Bar Specification sheets for ¼” x 2” Neoprene Rubber Cushion Strip Specification sheets for 1/8” x 2” Butyl Sealant Tape Specification sheets for Type 201 Stainless Steel Banding, ¾” Wide x .030” Thick Mill test reports for geomembrane roll stock used to make liner Shop test reports for each fabricated panel produced Field Test reports for all welds completed in the field Materials to start work and all equipment and long lead-time items should be at the job site prior to the PRECON Sub-contractor personnel list (POC with phone number) with fitness drawings Refined project schedule, All trade materials (mechanical, electrical, paint).

Submittals on the submittal schedule are required at the end of the project but before final inspection:

O&M manuals 30 Year Weathering Warranty Certificate for CSPE Geomembrane Training for shop personnel Repair parts list and vendors Maintenance paint As-Built and/or Record drawings

Final inspection and acceptance shall be conducted after the final punch list items are completed. The final punch list is compiled by the Contractor Quality Control individual immediately after the contract work is completed. The government’s QA individual will sign completion documents up to 90% (all work completed and Beneficial Occupancy taken) and the Project Manager (PM) will sign the final 100% payment documents upon receipt of acceptable As-Built/Record Drawings and any delayed work.

ATTACHMENTS/ENCLOSURES:

Drawings Specifications