A04_SOW_-_CVNWR_-_Concrete_Foundation_and_Floor.pdf

U.S. Fish and Wildlife Service – Canaan Valley N.W.R. 1 of 4 Technical Specifications – Concrete Foundation and Floor Slab

TECHNICAL SPECIFICATIONS

Concrete Foundation and Floor Slab

PART 1 - PROJECT OVERVIEW

A. NOTICES

1. Project Information

Project Title: Concrete Foundation and Floor

Location: U.S. Fish & Wildlife Service Canaan Valley National Wildlife Refuge 6263 Appalachian Highway Davis, WV 26260

Contracting Officer (CO): TBD

Project Engineer / Contracting Brian Waz, 413-253-8605, brian_waz@fws.gov Officer’s Representative (COR):

NWR Manager: Robert Frank, 304-704-5924 NWR Equip. Engineer Operator: Daryl Johnson, 304-940-6889

B. INTRODUCTION

1. Contract Work:

This Contract is for installing caissons and a concrete floor for a pre-engineered 40’W x 60’L metal building. The work consists of installing 30 – 12” diameter caissons, perimeter grade beam, and a 40’W x 60’L structural concrete floor.

Site preparation and grading to be completed by the U.S. Fish and Wildlife Service.

The Contractor shall comply with all industry standard best practices and materials.

2. Refuge Operations:

Refuge operations will continue during the performance of this contract. The Refuge Manager will be responsible for setting the working hours and site access details.

The Contractor shall exercise care and shall perform work diligently. If it becomes necessary to interrupt any function of the Refuge, the Contractor shall notify the Refuge Manager and shall not proceed in such interruptions until such time as the Refuge Manager makes provisions for and approves such operations.

3. Anticipated Award Period / Contract Type:

The Government anticipates a firm-fixed priced award of this contract in April 2025.

4. Completion Date:

The work shall be completed no later than 30 calendar days from the Notice to Proceed issued by the Contracting Officer.

U.S. Fish and Wildlife Service – Canaan Valley N.W.R. 2 of 4

PART 2 – SCOPE OF SERVICES

A. Scope

1. General Requirements:

Perform all work in accordance with stamped structural drawings, state and local building codes, and industry standards.

Site preparation, including clearing, grading, and marking the four corners of the foundation will be done by the Government.

The Contractor is responsible for marking the location of all the caissons.

All aspects of the cast in place concrete work shall conform to ACI 301, “Specifications for Structural

Concrete.”

Place no concrete on mud, disturbed soil, or frozen surfaces. Maintain site in a dry condition during placing and curing operations.

Notify Engineer at least 48 hours in advance of intent to place concrete.

Materials:

o Cement shall comply with ASTM C150, Type II and may contain 20% fly ash.

o Concrete 28-day compressive strength shall be 4,000 psi minimum.

o Slump: 4” – 6” maximum.

o Reinforcing shall be new billeted steel complying with ASTM A615, grade 40.

o Aggregates: Fine ASTM C33, Coarse ASTM C33 (1” max. size for structural concrete).

2. Caissons (Drilled Piers):

Layout & Excavation:

o Stake caisson locations per stamped structural plans.

o Excavate caisson holes to specified depth and diameter.

o Provide temporary casing if required to prevent soil collapse.

Reinforcement & Concrete Placement:

o Install steel reinforcement as per stamped structural drawings.

o Place concrete in caissons, ensuring proper vibration by mechanical means and consolidation.

o Conduct integrity testing as required (slump test).

3. Grade Beam:

Formwork & Reinforcement:

o Set up formwork for the grade beam, ensuring proper alignment and dimensions.

o Place reinforcing steel per stamped structural drawings.

Concrete Pouring & Curing:

o Pour concrete in the grade beam, ensuring adequate mechanical vibration.

o Conduct integrity testing as required (slump test).

o Formwork maybe removed after cumulatively curing at not less than 50℉ for 72 hours after placing concrete provided concrete is sufficiently cured and not damaged by removal of the forms.

4. Floor Slab:

Subgrade Preparation:

o Subgrade preparation and grading will be completed by the government.

o Install a vapor barrier if recommended.

Formwork and Reinforcement:

o Set up formwork for the grade beam, ensuring proper alignment and dimensions.

U.S. Fish and Wildlife Service – Canaan Valley N.W.R. 3 of 4 o Place reinforcing steel per stamped structural drawings.

Concrete Pouring & Curing:

o Pour and level concrete slab to required 6” thickness.

o Formwork may be removed after cumulatively curing at not less than 50℉ for 72 hours after placing concrete provided concrete is sufficiently cured and not damaged by removal of the forms.

o Sawcut crack control joints at 10’ on center maximum each way (refer to structural drawings).

o The concrete floor finish shall be a power float finish.

o Conduct integrity testing as required (slump test, and concrete t).

5. Concrete Curing:

Wet Curing:

o Wet curing methods are preferred. If a curing compound is recommended it must be approved by the Engineer. The wet curing should continue for a minimum of 72 hours. The following materials maybe used:

- Burlap, cotton mats, or other approved material kept thoroughly saturated by intermittent hosing.

- Slabs and other horizontal surfaces maybe covered with non-staining

6. Field Quality Control:

Slump Test:

o Test each batch of concrete at point of placement in accordance with ASTM C-143 and when additional water is added and when directed by the Engineer. Provide cones and equipment and maintain them at the site whenever concrete is placed. Concrete mixture with a slump greater than allowed shall be rejected.

Compressive Strength:

o Make and cure one set of four 6” x 12” cylinders in accordance with ASTM C-31 for the concrete floor slab pour. If the floor slab pour is done over different days, a set of cylinders should be done for each day. For each set of four cylinders, test one at 7 days, two at 28 days, and if any of the 28-day ones are unsatisfactory, test the remaining at 42 days. Test reports should be completed by a certified testing laboratory. Provide all labor for forming, curing, storing and transporting test cylinders to the approved testing laboratory.

B. Administrative Requirements

1. Environmental Protection. All work shall be accomplished in such a manner that all waste materials, pollutants, and potential pollutants shall be completely disposed of in accordance with all applicable Federal, State, and local regulations. At no time shall operations be attempted or permitted where or when such operations present a possibility of fouling the hatchery facility with waste materials, pollutants, or potential pollutants.

2. Work Site Safety. The Contractor shall be solely responsible for ensuring that all their on-site activities and equipment conform fully to all standards of the Department of Labor, Occupational Safety and Health Administration (OSHA) 29 CFR 1926 and 1910. Additionally, the contractor shall adhere to all applicable Federal standards, nationally recognized building codes, and nationally recognized safety codes. The Contractor shall submit an accident report to the Contracting Officer for any accident that involves lost time by the injured employee regardless of whether professional medical treatment was required or not.

3. Inadvertent Discovery. In the unlikely event an inadvertent discovery of cultural material is discovered during the project all work in the vicinity will cease and Robert Frank, Refuge Manager, will be contacted

U.S. Fish and Wildlife Service – Canaan Valley N.W.R. 4 of 4 immediately. Refuge staff will take appropriate action to identify and determine significance of the find before work in the area can continue. Work outside the immediate area can continue as planned. Cultural material includes but not limited to; glass, ceramic, bone, brick, etc.

C. Project Submittals

Concrete Foundation and Floor:

The following information is required from the Contractor, but not limited to:

Construction Schedule: Submit the proposed work schedule for approval within 10 days after award of contract prior to any work being started. Itemize each principal component/phase of work and the calendar days of anticipated performance. Submit a revised schedule any time the actual work progress lags the scheduled time by more than 5 calendar days.

Concrete mix design, furnish that the mix meets specified requirements. Provide items of information as specified under ASTM C94, batch ticket information.

Concrete slump test results.

Compressive strength test results.

Submit manufacturer’s information for rebar.

Gradations of aggregates.

Submittals shall be emailed to the following:

Contracting Officer (CO): TBD

Project Engineer / Contracting Brian Waz, 413-253-8605, brian_waz@fws.gov Officer’s Representative (COR):

NWR Manager: Robert Frank, 304-704-5924, robert_frank@fws.gov

NWR Equip. Engineer Operator: Daryl Johnson, 304-940-6889, daryl_johnson@fws.gov

4. INSPECTIONS AND ACCEPTANCE

The services/work performed under this contract are subject to observation, inspection, and review by the USFWS.

5. SITE VISITS

It is highly recommended that prospective bidders conduct a site visit before bidding. Coordinate any site visits with Daryl Johnson and/or Robert Frank.