Attachment_1_-_Revised_Statement_of_Work_0002.docx

BGNDRF Concrete Sidewalks and Driveway Repair Statement of Work Part 1 – General Information

1.0 Abbreviations, Acronyms, and Definitions

The following abbreviations and acronyms are used throughout this performance work statement:

The Bureau of Reclamation (Reclamation) has determined a need to demolition a small concrete sidewalk and construct new heavy-duty sidewalks and driveway along the southern elevation of the Brackish Groundwater National Desalination Research Facility (BGNDRF). BGNDRF is located in Otero County New Mexico at latitude 32° 53’ 00.3” N, longitude -105° 58’ 35.2” W street address 500 La Velle Road Alamogordo, New Mexico 88310.

1.2 Background

The BGNDRF existing sidewalks and driveways have deteriorated over time from roof runoff. Changes have been made to reduce damage reoccurrence, so a new sidewalk and driveway need to be constructed.

1.3 North American Industry Classification System (NAICS)

The NAICS for this work are:

· 238990 – Concrete paving, residential and commercial driveway, and parking areas.

1.4 Standards

The Statement of Work shall following the standard set-forth in the following paragraphs.

American Concrete Institute (ACI):

American Institute of Steel Construction (AISC):

AISC SCM 16TH Steel Construction Manual – 16TH Edition APA - The Engineered Wood Association (APA):

APA VPS PS 1-22 Structural Plywood American Society for Testing and Materials - International (ASTM):

Bureau of Reclamation (USBR):

International Concrete Repair Institute (ICRI) ICRI 310.2R-2013 Selecting and Specifying Concrete Surface Preparation for Sealers, Coatings, and Polymer Overlays (formerly No. 03732) Western Wood Products Association (WWPA) WWPA WLGR-2021 Western Lumber Grading Rules 2021

1.5 Submittals

Submit the following for Government review or approval:

· Prepare in English.

· Measurement Units: US Customary Units.

· Label with contract number and title including Required Submittal Number (RSN).

· Provide a unique transmittal tracking number for each submittal.

· Drawings and sketches shall follow the U.S. National CAD Standard, Version 6.

· Required certifications shall be performed by a registered professional.

· Manufacturer’s certifications shall be signed by authorized representative.

· Review of submittals:

· Time required: The Government will require a minimum of 5 working days to review each submittal or resubmittal, unless otherwise specified.

· Excess Time: Should the Government require additional review time; the CO may extend the contract completion date to allow completion of work. Time extension will be to the extent that the excess review time caused delay to contract completion.

· Submit the following for Government approval or review.

· Submittal Types: A – Action requiring Government approval and I – Informational requires Government written receipt.

· Submit to COR one electronic (eMail) copy for review.

Table A – Submittals

· Proposed date to mobilize.

· Proposed date for forming and placing CIP concrete sidewalks and driveways

PART 2 – WORK REQUIREMENTS

2.1 Schedule of Project Tasks

Schedule A work tasks include but not limited to the following work:

· Provide required submittals within required timelines.

· Coordinate with BGNDRF manager on site access and work schedule.

· Remove select existing concrete sidewalks and/or driveways

· Prepare subgrade

· Install formwork, reinforcement, and expansion materials

· Moisten ground surface prior to concrete placement.

· Place and finish concrete sidewalks and driveway

· Raise height of Manhole and Utilities systems to 1.5-Inches above finished grade

· Finish grading site

· Site Cleanup

2.2 Site Visit and Period of Performance

Reclamation highly recommends perspective offerors to complete a site visit for a complete understanding of the project objective and scope.

**A site visit will be held Monday, March 31, 2025 and Friday, April 4, 2025. Please contact Project Manager Malynda Cappelle at mcappelle@usbr.gov or (575) 443-6553 to schedule a time between 8am and 11am or 2pm and 4:30pm MDT.

The Government considers the demolition and construction activities for concrete sidewalk and driveway and raising the manhole and utility systems to above ground level to be completed within 21 calendar days after NTP has been issued. The Contractor shall supply all labor, management, transportation, equipment, supplies, materials, etc. necessary to perform these activities.

2.3 Location and Hours of Operation

BGNDRF is located in Otero County New Mexico at latitude 32° 53’ 00.3” N, longitude -105° 58’ 35.2” W street address 500 La Velle Road Alamogordo, New Mexico 88310. Standard business hours are Monday through Friday from 7:30 am to 5:00 pm MDT except Federal Holidays.

PART 3 – MATERIALS

1.) High-grade rubber, tread-type compound.

2.) SBR rubber compounded and cured to meet physical characteristics in Table B - Rubber Joint Strip Physical Characteristics.

Table B - Rubber Joint Strip Physical Characteristics

Extrude and cure so that cross section will be dense, homogeneous, and free from porosity and other imperfections.

1.) Conform to detail dimensions and tolerances indicated on Drawing 40-D-5269.

2.) The following minor imperfections will be acceptable:

a. Lumps and depressions no exceeding 1/4 inch in longest lateral dimension and 1/16 inch deep with no limit to the frequency of occurrence.

b. Lumps and depressions between 1/4 and 1/2 inch in longest lateral dimension and 3/32 inch deep as long as the frequency of occurrence does not exceed six in a 50-foot length, and there is at least 2 inches between any two such defects.

c. Marks resulting from tubing operation or handling during manufacture with no limit to width or frequency of occurrence as long as thickness of material below the mark is not less than the minimum thickness.

d. Coarse or grainy surface.

e. Suck-back along flash line of molded goods if not more than 1/16-inch wide, 1/16-inch deep, and not more than 2 feet long.

3.) Furnish rubber joint strip in lengths not less than 12-feet.

The concrete shall not exceed a maximum vertical drop of 2 feet. Place concrete to lengths, widths, and thickness as showing in sketches. Formwork for above ground placement shall not leak and maintain concrete in a confirmed space.

4.1.2 Curing

Contractor shall cure concrete according to Government approve plan. Concrete surfaces shall be kept above 50◦F for a minimum of 7 days.

1.) Concrete Age: Between 24 and 72 hours.

2.) Packaged Repair Material:

a. Suitable for repair thickness is 1/2-inch and width of less than 6-inches. Follow ASTM C109, 73 degrees Fahrenheit, formulated for low shrinkage and durable in exposure conditions, ASTM C157, C469, C109, C882, C1581:

i. 28 Days: Minimum 5,500 psi.

ii. Coefficient of Thermal Expansion, CRD C 39: 7.5 to 8.5 x 10-6 in/in/ degree F.

iii. Direct Tensile Strength, CRD C 164, 2-inch by 4-inch specimens, Average Tensile Strength:

1. 28 Days: Minimum 400 psi.

iv. Bond Strength, ASTM C882, Modified per ASTM C928, 3-inch by 6-inch slant-shear specimens, Average Slant-Shear Bond Strength:

1. 28 Days: Minimum 2,000 psi.

v. Mix components in accordance with manufacturer’s instructions.

3.) Portland Cement Mortar:

a. Less than about 6-inches across.

b. Sand: ASTM C33 fine aggregate, except 100 percent passing No. 16 sieve.

c. Clean water: ASTM C1602 including optional requirements of Table 2.

d. Consistency - 1 part cement; 2 parts, by volume, of sand; and enough water so that mortar has consistency of thick cream.

4.) Dry Pack Mortar:

a. Minimum depth – one inch and does not extend through section or behind or under reinforcing steel, and less than 1 square foot in surface area.

b. Sand: ASTM C33 fine aggregate, except 100 percent passing No. 16 sieve.

c. Clean water: ASTM C1602 including optional requirements of Table 2.

d. Consistency - 1 part cement to 2.5 parts sand with sufficient water so that the mortar will stick together when squeezed by hand but not exude water.

4.1.4.2 Old Concrete Repair Materials

1.) Concrete Age: Greater than 72 hours.

2.) Packaged Repair Material.

a. Used on both new and old concrete, refer to Packaged Repair Material in New Concrete Repair Materials above. Concrete meeting the requirements as proportioned to be shrinkage compensating with: PREVent C, as manufactured by Premier Magnesia, www.premiercpg.com, or equal with the following essential characteristics: Facilitate expansion of concrete at essentially the same rate as shrinkage during the curing period. Reduce the capillary surface tension of pore water. Provides at least 60 percent shrinkage reduction. Formulated for use in freezing weather. ASTM C1581: No cracking for a minimum of 90 days.

b. Dry Pack Mortar: Used on both new and old concrete. Refer to Dry Pack Mortar in New Concrete Repair Materials above.

3.) Curing Materials:

a. Curing compound according to ASTM C309, type 1-D, ASTM C1315, type I-A, or Polyethylene film: ASTM C171, white opaque.

4.1.4.3 New Concrete Repair

1.) Grinding:

a. To correct surface bulges, offsets, and other irregularities.

b. Limit grinding depth so that no more than 1/2 the diameter of the largest aggregate particle is exposed. If limits cannot be met, remove and replace concrete.

c. Preparation:

i. Remove abrupt protrusions (i.e. form fins) flush with the concrete surface. Remove surface contaminants such as latencies by pressure washing, or by other methods as approved by the COR. Adjust pressure to remove contaminants and limit concrete excavation unless excavation is required.

ii. Do not interrupt curing of adjacent concrete. Keep concrete surfaces moist until repairs are completed.

d. Portland Cement Mortar:

i. Moisten surface and place mortar on damp surface. For small repairs, use sponge rubber float to fill surface defects with mortar. For larger repairs, spray apply mortar.

ii. If repairs are more than 1 inch deep, apply mortar in layers not more than 3/4 of an inch thick. Allow sufficient time between layers so material does not sag.

iii. Rub dry mix of same proportions to stiffen and solidify plastic material.

e. Curing:

i. Immediately after placement, bring concrete surface and surface of repair material to saturated surface dry (SSD) by misting.

ii. Maintain moist curing for 14 days.

iii. Apply curing compound immediately after surface appears dry. Use curing similar to adjacent concrete.

4.1.4.4 Old Concrete Repair

1.) Shallow Repairs:

a. For defects where less than 1/3 circumference of reinforcing steel.

b. Where needed, shape repair area to prevent trapping air in placement.

c. Use materials suitable for thickness of repair and as approved.

d. Contain materials with formwork as needed.

e. For stiff repair materials, thoroughly pack material into void and rub over area with a sponge rubber float or steel trowel to fill defects.

2.) Presoak prepared concrete surface before placement of repair material. Ensure surface moisture conditions meet repair material requirements.

3.) Apply repair materials.

a. Remove standing water.

b. Mix components as approved.

4.) Follow approved application instructions:

a. For vertical and overhead repair (stiff) material, apply repair material with sufficient pressure to ensure intimate contact with substrate.

b. For horizontal repair materials or repair materials contained by formwork, use placement methods to ensure intimate contact of repair material with substrate. Remove forms when repair mortar has reached sufficient strength, so it is not damaged by form removal.

5.) Curing: Follow manufacturer’s instructions.

a. Curing Compound: Apply curing compound in accordance with product instructions. Moist cure for 7 days, depending on drying conditions includes time in form.

4.1.4.5 Protection

1.) Protect from direct sunlight, wind, and other conditions that could cause rapid drying.

2.) Protect from damage or deterioration during project.

4.1.4.6 Reinforcing Steel

1.) Replace any single reinforcing steel bar or section of bar that has lost more than 25 percent of its cross-sectional area.

2.) If adjacent bars are damaged, replace adjacent bars with 20 percent or more loss in cross sectional area.

3.) Replace bars to match original bar size according to ACI 318, section 25.5.1and 25.5.2 as appropriate, or as approved by the COR.

4.1.4.7 Forming

1.) Use formwork to protect, prevent movement and leakage of repair material, repair holes and gaps.

2.) Use form chimneys to allow for concrete consolidation and observe placement.

4.1.4.8 Finishing

1.) Tooled Edges: Tool exposed edges to a radius of 1/4 inch.

2.) Where finishes are not specified or shown on drawings for a particular surface, finish concrete as specified for similar work. Finish concrete in presence of COR unless inspection is waived.

3.) Formed surfaces:

a. Finish F2:

i. Applies to exposed formed surfaces as specified in Table 03 81 14A - Formed Surfaces.

ii. Recess tie rod ends and fill recess with dry pack or other material approved by COR.

b. Unformed surfaces:

i. Surfaces shall be even uniform.

4.2 Installation Rubber Joint Strips

Install materials as recommended by manufacturer, standards, best practices, and site conditions as shown on drawings:

1.) Do not install rubber joint strips until curing of adjacent concrete has been completed.

2.) Joints: Close fitting butt joints. Location subject to approval of COR.

PART 5 – SKETCHES AND DRAWINGS

5.1 Site Sketch

The following site sketch represents the overall project layout.

5.2 Standard Drawings

All standard drawings start with the following title block information:

1.) U.S. D.O.I. BOR Standard Designs:

a. 40-D-60003 - General Notes for Concrete Outline and Reinforcement

b. 40-D-60004 - Minimum Requirements for Detailing Reinforcement image1.tif