Fraser Weir Repair SOW rev 8.26.2022.pdf

US Department of Agriculture (USDA)

Statement of Work

Contents Project

General Information

1.0 Scope of Work

2.0 Background

Contractor Requirements

3.0 Technical Requirements / Tasks

4.0 Government Furnished

5.0 Deliverables / Schedule

6.0 Travel

7.0 Contractor’s Key Personnel

8.0 Security Requirements

9.0 Data Rights

10.0 Section 508 – Electronic and Information Technology Standards

Attachment

Project GAOA Fraser Water Quality Research Weir Rehabilitation

General Information

1.0 Scope of Work

Contractor shall provide all equipment, materials, and labor to provide various repairs on five separate research Weirs at the Fraser Experimental Forest. This project involves the use of heavy equipment operators, general laborers, carpenters, and masons. It is located at Fraser Experimental Forest 4.4 miles Southwest of the Town of Fraser, Colorado on County Road 73.

2.0 Background

Since 1937, research has been conducted at Fraser Experimental Forest on water quantity and quality, forest management, riparian habitats, invasive species, insects (including mountain pine beetle), wildlife, soil, and climate.

Steam gauge data logging has been continuous at East St. Louis Creek, Deadhorse Creek, and Fool Creek for over 70 years. Accurate stream gauge data at these locations is achieved by reducing turbulence in the creeks via stilling basins.

The lower basins are hydraulicly connected to a buried corrugated metal pipe (CMP) stilling well, where hook gauge measurements are taken. Over the decades, the timber sidewalls of the stilling basins are collapsing inwards, necessitating repair.

Fraser Experimental Forest is surrounded on both sides by Wilderness Areas and is one of the most pristine forest locations in the entire State. This project has a high emphasis on minimal environmental impact. Wildfire risk is high, and fire safety practices will be critical extremely important.

Contractor Requirements

3.0 Technical Requirements / Tasks

General Notes

Site access consists of 4x4 roads with limited turn around space. Contractor shall plan accordingly utilizing smaller equipment and hauling vehicles.

Creek diversions shall be completed by the forest service prior to construction. De‐watering will be required in stilling pond bottoms during construction.

Construction must occur during low flow periods of August ‐ October.

Excavation is in rocky terrain. Blasting is not permitted for excavation.

Contractor shall verify all quantities and dimensions prior to purchasing materials.

All demolished materials become property of the contractor and must be demolished in accordance with state and local regulations. No hazardous materials are expected on site.

Contractor shall reuse all backfill material to the maximum extent possible. Offsite disposal of earthen materials is not expected. If any leftover earthen materials remain after reconstruction, they shall be placed in an agreed upon location with the COR.

Contractor shall store all stockpiled materials in an area agreed upon at the pre‐construction conference.

Minimize vegetation disturbance to the site to the maximum extent possible. Disturbance area should be limited to the minimum space necessary to complete sidewall repair. Only excavate as necessary to safely replace the sidewalls.

Fire Safety o The Contractor shall not allow open fires in the project area without advance permission in writing from the Forest Service.

o The Contractor shall not allow smoking, except within an enclosed vehicle or building.

o All power‐driven equipment operated by the Contractor on National Forest land, except portable fire pumps, shall be equipped with one fire extinguisher having a UL rating of at least 5 BC, and one "D" handled or long handled round point shovel, size "0" or larger. In addition, each motor patrol, truck and passenger‐carrying vehicle shall be equipped with a double‐bit axe or Pulaski, 3‐1/2 pounds or larger.

Equipment shall be kept in a serviceable condition and shall be readily available.

o Each gasoline power saw operator shall be equipped with a pressurized chemical fire extinguisher of not less than 8‐ounce capacity by weight, and one long‐handled round point shovel, size "0" or larger. The extinguisher shall be kept in possession of the saw operator at all times. The shovel shall be accessible to the operator within 1 minute.

o One refill for each type or one extra extinguisher sufficient to replace each size extinguisher required on equipment shall be safely stored in the fire tool box or other agreed upon place on the project area that is protected and readily available.

o Each internal combustion engine shall be equipped with a spark arrester meeting either (1) USDA Forest Service Standard 5100‐1a, or (2) appropriate Society of Automotive Engineers (SAE) recommended practice J335(b) and J350(a) as now or hereafter amended.

Contractor shall be prepared for spills with a 55 gallon drum available onsite. If a spill occurs, place contaminated soil in the drum and dispose of in accordance with local, state, and federal regulations.

Scheduled Item Specific Notes (from the Schedule of Items)

Item Weir Title Description Code Compliance

1 All Mobilization, Bonding, and

OH&P

2 ESL Repair Sidewalls

Remove and replace Timber sidewalls and headwalls of stilling basins in accordance with attached drawings. Do not disturb the existing Weir wall. Timbers shall be nominal 4x12s with 6x6 Dead‐ mans. Timbers shall be treated with copper azole (CA‐C) with a minimum concentration of 0.15 pounds per cubic foot. Timber Moisture content shall be a maximum of 19%.

Fasteners shall be hot dip galvanized steel ⅝” ø 12” long or exterior rated structural screws. Pre‐drill holes in timbers before affixing fasteners. All corners shall be braced with 3x3x ⅜" thick A36 galv steel angles. Angles shall be affixed to concrete weir walls with wedge anchors and exterior rated epoxy to prevent water infiltration.

Timber: DOC PS 20, "American Softwood Lumber Standard" Timber: AWPA U1‐ use category UC4B minimum.

Steel: ASTM A36 Excavation Safety: 29 CFR Part 1926, Subpart P

3 ESL Relocate and replace existing recorder hut

Hoist and relocate recorder hut during construction. Replace flooring and roof after completion (match existing).

Roofing: 29 gauge steel Testing Data & Specifications Accelerated testing 2000 hours ‐

ASTM G23

Salt Spray testing 1000 hours ‐

ASTM B117

Fire Testing ‐ ASTM E108 or UL 790 Wind Driven Rain ‐ TAS 100

4 ESL Repaint recorder hut

Strip and repaint recorder hut with exterior rated paint. Match existing color.

5 ESL Repair Stilling Pond Bottom

After basin wall repairs are completed, Contractor shall reestablish stilling pond impervious liner with an 8” thick layer of sodium bentonite clay. Clay liner shall be installed in 2” lifts with hand compacted between each layer.

6 LFC Repair

See Item 2. Include sidewall installation downstream of the weirwall.

7 LFC Repair Recorder Hut

‐ Contractor shall remove and replace recorder hut and full depth foundation in accordance with the attached drawings.

‐ The 6'x6' wood framed shed shall be constructed from 2x4 and 2x6 treated lumber. The siding shall be cement plant (James Hardie or approved equivalent. Roof shall be factory coated metal roofing (Propanel or approved equivalent) in Forest Green. Include steel door and interior plywood shelf. Paint interior white. Include aluminum insect screens for soffit vents.

‐ The CMU foundation shall be placed upon an 8” thick slab of 4,000 psi reinforced concrete. CMU shall include vertical and horizontal reinforcement along with grout and mesh.

‐ three 2” ø Galv Steel threaded pipes shall be used as piezometric openings tied to the stilling well to the lower stilling pond. Pipes

Lumber: AWPA C2. Kiln dry after treatment to a maximum moisture content of 19 percent.

Plywood: AWPA C9. Kiln dry after treatment to a maximum moisture content of 18 percent.

Hardboard Siding: AHA's "Recommended Basic Application and Painting Instructions for Hardboard Siding."

CMU, Mortar, & Grout: ASTM C270 Concrete Materials:

shall be reinforced to the CMP well with flange fittings. Pipes shall be run through CMU block to vertically reinforce pipes.

Portland Cement: ASTM C 150, Type or I/II, use one brand of cement through‐out project.

Normal‐Weight Aggregate: ASTM C 33, uniformly graded, not exceeding 1‐1/2‐inch (38‐mm) nominal size.

Water: Complying with ASTM C 94.

Reinforcing Bars: ASTM A 615/A 615M, Grade 60 (Grade 420), deformed.

Bar Supports: Bolsters, chairs, spacers, and other devices for spacing, supporting, and fastening reinforcing bars and welded wire reinforcement in place.

Manufacture bar supports from steel wire, plastic, or precast concrete according to CRSI's "Manual of Standard Practice."

8 LFC Install Steel Erosion Plate

4'x8' A36 galv steel plate staked to the ground at the weir's outlet Steel: ASTM A36

9 LFC Repair Stilling Pond Bottom

Replace cedar planking with Bentonite Clay Layer. See item 5.

10 LFC Remove and Replace Head Gate

Replace galv steel sliding gate. 15” dia. Extend stem so that gate can be hand operated while standing above the weir.

11 DHM Repair

See Item 2

12 DHM Repair Stilling Pond Bottom

See Item 5

13 DHM Repaint Existing Recorder Hut

See Item 4

14 DHN Repair Sidewalls

See Item 2 shorten the depth of deadmans by 2 feet at the bottom row.

15 DHN Install steel bracing

Install two adjustable steel, corrosion resistant bracing. Use Ellis Heavy Duty Lifting Shore or approved equivalent

16 DHN Repair Recorder Hut

See Item 7

17 DHN Repair Stilling Pond Bottom

See Item 5

18 DHN Remove and Replace Head Gate

Remove butterfly valve (hand operated). Replace with galv steel, 12” dia. Sliding Gate (submit requested)

19 DHS Remove and Replace Head Gate

Remove butterfly valve (hand operated). Replace with galv steel, 12” dia. Sliding Gate (submit requested)

20 DHS Repaint Existing Recorder Hut

See Item 4

1‐ Optional

DHM Repair Recorder Hut

Replaces Item #13 See Item 7

Table 1: Specifications based on Schedule of Items

ESL‐ East St. Louis LFC‐ Lower Fool Creek DHM‐ Deadhorse Main DHN‐ Deadhorse North

DHS‐ Deadhorse South

4.0 Government Furnished

Before Construction, the Government shall clear the excavation areas of vegetation and shall perform the creek diversions. It should be noted that water will still enter the basins after the creeks are diverted. The Contractor shall still need to dewater during construction.

Government will provide access to the site during normal business hours (0800‐1630, M‐F). Work outside of this period may be permissible with prior approval from the COR (Aaron Wurster, aaron.wurster@usda.gov) and Site Manager (Banning Starr, banning.j.starr@usda.gov) .

Note that site is scheduled to be closed during all Federally recognized holidays. https://www.opm.gov/policy‐ dataoversight/pay‐leave/federal‐holidays/

No power or restrooms will be available on‐site.

5.0 Deliverables / Submittals

Timely submission of deliverables is essential to successful completing this requirement. Schedules for deliverables are specified in Table 2. All deliverables shall be prepared and submitted electronically via email with contract number, project title, item number (from Table 2), and submission date clearly noted.

Key Deliverables

Item No. Deliverable Objective Due

1 Proposed Project Plan Defining the responsibilities, timeline, risks and milestones of contract objectives.

No later than ten (5) business days after contract award

2 Weekly Status Report Report documenting tasks & issues weekly. Weekly, every Friday, by 3:00 PM MT during active construction periods until the contract expires

3 Safety/Fire prevention plan

Highlight operational safety and fire control measures.

Before construction start.

4 Timber Data Sheet Documentation for 4x12 and 6x6 used in sidewall reconstruction.

Before construction start.

5 Fastener Data Sheet Documentation for galv spikes or structural screws used in sidewall reconstruction.

Before construction start.

6 Angle Steel Data Sheet Galv Steel Angle pieces for sidewall corners. Before construction start.

7 Concrete wedge anchors/epoxy Data Sheet

Material Data Sheets for anchoring angle steel into existing concrete weir walls.

Before construction start.

Exterior Paint Data Sheet

Material Data Sheets for paint. Highlight selected Color.

Before construction start.

9 Sodium Bentonite Data Sheet

Stilling pond Bottom material Data Sheet. Before construction start.

10 Concrete Data Sheet Material Data Sheet for concrete base of stilling well/recorder hut. Include reinforcement plan.

Before construction start.

11 CMU block, grout, morter, mesh & reinforcement plans and Data Sheets

Material Data Sheet for all materials in CMU foundation. Include shop drawings for reinforcement plans.

Before construction start.

12 Aggregate Data Sheet Material Data Sheet for aggregate used underneath concrete foundation and to be placed between the stilling well (CMP) and CMU foundation.

Before construction start.

13 Piezometric Openings Data Sheet

Material Data Sheet for Galv Steel threaded pipes. Before construction start.

14 Anchor Bolts Material Data Sheet for J bolts anchoring recorder hut framing to CMU foundation.

Before construction start.

15 Framing Lumber Material Data sheets for treated 2x4 and 2x6 framing lumber.

Before construction start.

16 Framing Shop Drawings Shop drawings showing framing plans Before construction start.

17 Siding Data Sheet Material Data Sheet for cement composite siding. Before construction start.

18 Siding Shop Drawings Shop drawings for siding plan Before construction start.

19 Sheet Metal Roofing Data Sheet

Material Data Sheet for metal roof. Highlight factory color option.

Before construction start.

20 Steel Door Data Sheet Material Data Sheet for steel door. Highlight pertinent options and features.

Before construction start.

21 Headgates Material Data Sheet for galv steel sliding headgate replacement. Highlight stem options.

Before construction start.

Table 2: Deliverables

6.0 Travel

Travel to the separate Weirs shall initially require a government escort. The Site manager shall issue the contractor access keys to open the various gates throughout the Experimental Forest. All costs associated with travel to and from the job site, including mobilization of all equipment and materials shall be included in the Contractor’s cost proposal.

7.0 Contractor’s Key Personnel

Project Superintendent: Onsite representative of the General Contractor, responsible for overall management of the project and capable of discussing technical aspects of the project.

8.0 Security Requirements

N/A

9.0 Data Rights

10.0 Section 508 – Electronic and Information Technology Standards

Attachment Drawings