ITB_32801-13749_Specifications_10.13.25.pdf

ITB 32801-13749

HAMPTON CREEK FISH BARRIER RECOVERY; TWRA

SPECIFICATIONS

The Tennessee Wildlife Resources Agency (TWRA) is procuring a one-time repair of the Hampton Creek fish barrier streambank, located in Carter County Tennessee.

All work shall be completed in accordance with the following work scope and construction specifications below and attached. The contract shall include (but not be limited to) the repair or installation of rock, geotextile, mulch, and vegetation as well as the clearing, removal, and disposal of existing trees, limbs, logs and stumps within the designated recovery area.

Pre-disaster condition and desired result of this recovery project is reflected in

Appendix B (page 11) of this document.

I. SITE VISIT

A. To bid on this solicitation, a site visit is required at the project location listed below:

1. Hampton Creek Trailhead, Hampton Creek Cove State Natural Area, Roan Mountain, TN 37687

2. GPS: 36.15234672054734, -82.05570086241627

3. Date and time: Tuesday, October 28, 2025, at 10 AM (EST)

4. See Appendix A (page 10) for a map of the site visit location.

5. Please call two (2) business days in advance to schedule the visit. Point of contact is Chris Haley. Phone: 629-292-2610 or Email:

Chris.R.Haley2@tn.gov

Note: After parking your car, you may need to walk to the actual site of the fish barrier.

II. PAYMENT

A. The bid shall be the total cost of the project and shall be all-inclusive for labor, equipment, and materials.

B. Invoices shall contain the contract line-item id and its description.

C. Payment shall not be made until all work has been completed and has been approved by the TWRA representative.

D. Upon request, Contractor shall provide a document showing proof of purchase of project resources.

III. CONTRACTOR LICENSES & MANPOWER

A. Tennessee Code § 62-6-119 (2024), Any person or entity preparing plans, specifications or any other documentation for inclusion in an invitation to bid or comparable bid document including any electronic bidding documents, shall reference this chapter in such documentation and include a specific statement informing the invited bidder that it is necessary for such bidder to be properly licensed at the time of the bid and provide evidence of compliance with the applicable provisions of this chapter before such bid may be considered. Failure of any bidder to follow or furnish the

TCA § 62-6-119 required information shall void such bid and such bid shall not be considered.

B. Labor/Manpower

6. Site foreman/safety representative

7. Certified and/or licensed equipment operator(s)

8. Any necessary additional workers to be determined by scope of task.

IV. GENERAL SPECIFICATIONS

A. See Appendix B (page 11) for image of previous fish barrier.

B. All permits shall be obtained by TWRA.

C. All practices shall be constructed according to plans furnished by the

Tennessee Wildlife Resources Agency (TWRA) and in accordance with engineering standards for these practices, as well as local building codes and current industry standards. Any deviation from the approved drawings and specifications must be approved by the TWRA representative prior to construction.

D. Construction operations shall be carried out in such a manner that erosion, air, water and noise pollution will be minimized and held within legal limits as established by state or local regulations. Specified materials shall provide stability, durability, and safety characteristics required to achieve the planned objective.

E. TWRA shall obtain the vendor for any work to be performed outside or not included withing the statement of work (SOW).

F. TWRA shall obtain a contract amendment or additional vendor occurrences outside of the identified recovery scope or Statement of work (SOW).

G. Statements of work (SOWs), including construction specifications, and shop drawings shall be obtained from TWRA before a project or construction shall begin.

1. Any additions or changes to the project or SOW shall receive prior approval by TWRA before any institution of the changes or additions.

2. If any approved changes to the project occurs, an updated SOW shall be provided by TWRA.

3. Any delays during a project that were not requested or caused by

TWRA shall not be an additional charge to TWRA.

H. Contractor shall meet frequently with TWRA’s designated representatives to ensure proper construction of the project.

V. SAFETY AND RISK MANAGEMENT

A. Contractor shall follow all TOSHA and OSHA standards, while maintaining a designated safety representative throughout the access period to State of

Tennessee property, to protect staff and public from risk.

B. Shall be compliant with the State of Tennessee’s purchasing guidelines as stated in the statement of work document.

C. Shall be compliant with the Tennessee Department of Environment and

Conservation regulations.

D. Shall be Environment Protection Agency (EPA) complaint.

E. Contractor staff shall obtain and maintain applicable certifications and licenses, such as equipment operators, and shall be able to provide proof upon request.

VI. INSTALL STREAM DIVERSION

A. Oversite provided by TWRA and/or other qualified representatives.

B. The temporary stream diversion shall prevent any passage of fish from below the barrier (downstream) into the area upstream of the barrier. A

‘perched’ culvert with a vertical drop of 3-4’ from the downstream lip to the diversion stream bed shall accomplish this.

C. Shall be installed by Contractor.

VII. STREAMBANK REMEDIATION

A. Please see the Attached engineering drawings from the Natural Resources

Conservation Service (NRCS) US Department of Agriculture (USDA).

B. Streambank Debris Removal - Select and carefully dig up any vegetation to be replanted in the riparian or bioengineering areas of the final design taking care to preserve the existing root structure. Stockpile selected vegetation in a manner that will allow for successful replanting. Remove all other trees, brush, stumps, existing grass, and any other vegetation from the proposed locations for all structures, from the location where the equipment will have to sit, and from the keyway location to construct the proposed conservation practice. Dispose of all woody vegetation by burning or burying onsite, under the direction of TWRA.

The burial pit location should not be close to the project site, and it would be best if it wasn’t in the floodplain adjacent to the site. Clearing shall be kept to the minimum needed to construct the designed practices. Conduct all burning according to Federal, State, and Local laws and regulations.

C. Erosion and public access control

1. Erosion control shall include, but not be limited to, the grading of the bank and placement of rock, fabric, and/or seed.

2. Public access control shall include adequate and reasonable barriers, signage and other protection methods (not mentioned) that limit public exposure to construction area hazards or risks.

VIII. STREAMBANK EXCAVATION AND EMBANKMENT

CONSTRUCTION

A. Excavation (Topsoiling) - There is normally a layer of topsoil at the top of the existing streambank. The layer will vary in depth. The topsoil layer shall not exceed 6” in depth (The local TWRA representative will specify when topsoil excavation is complete). The topsoil shall be excavated and stockpiled in locations that don’t hinder the construction operations.

Upon final grading, the topsoil material shall be evenly spread onto all disturbed areas where topsoil is no longer present. The topsoil shall be lightly tamped down with the bucket of the excavator or tracked in with the tracks of the dozer. The intention is for this to help with vegetation to be planted.

B. Excavation (Subgrade) - All structure subgrades shall be accomplished by excavating the slopes and keyways to the neat lines and grades shown on the drawings. The finished surface of all structures shall be relatively smooth and free of rocks, roots, or any item that could puncture the geotextile.

All excess excavated soil and cobble material can be used as fill material in areas specified by the TWRA representative. Special care shall be taken to place excess excavated material in areas that won’t allow reentry into the stream channel.

C. Earthfill - All earthfill material used shall be primarily silts, silty clays, and clay soils. All earthfill shall be free from sod, roots, limbs, debris, and any other material that will prevent proper compaction.

The final constructed surface shall be relatively smooth, firm, and prepared for the placement of the coir matting, geotextile, and rock. All compacted earthfill shall be compacted in lifts not to exceed 6” in thickness. The surface of each lift shall be compacted by walking a tracked piece of equipment over the entire surface of each lift a minimum of 2 times.

The constructed earthfills shall blend with the surrounding existing slopes as much as possible. A minimum 6” thick layer of topsoil shall be spread on top of any compacted surface that is to be seeded.

D. Geotextile - All geotextile shall be Class I, non-woven, needle-punched, minimum of 202 pounds of tensile strength, 433-pound puncture test strength, and a minimum of 8-ounces per square yard.

The geotextile shall be placed under all rock rip-rap. Securing pins shall be steel or fiberglass formed as a U-, L-, or T-shape. The L- and T- shapes require steel washers to prevent total penetration through the geotextile.

Lap abutting geotextile panels a minimum of 24 inches (unless otherwise specified) upslope over downslope and secure against the underlying foundation material. Place securing pins along the edge to hold it in place during installation, about 2 inches from the edge of geotextile at intervals, 12 feet max, in sufficient quantity to prevent slippage or movement of the geotextile.

Secure vertical laps through both layers midway through the overlap, secure horizontal and across slope laps only through the bottom layer. Repair all torn geotextile by spreading a new piece of geotextile.

IX. FISH BARRIER CONSTRUCTION

(VERTICAL STEEP BARRIER AND SCOUR POOL)

A. Shall be approved and strategically monitored with the TWRA representative.

B. Site preparation shall be the removal of trees as well as the moving, removing, adding of dirt, gravel, rock, or other such materials to accommodate precise placement of existing or new stone as per dimensional design provided by the stamped drawings.

C. Rock Rip-rap - The d50 36” boulders used for the fish barrier recovery and streambank stabilization shall range in size from 24” to 48” with the majority of the rocks 36” in diameter or larger. Construction will be easier if the boulders are cubical or rectangular in shape.

TWRA staff shall approve of boulders before they are placed. TWRA staff will be made available to accompany contractors to the quarry to select the appropriate boulders. All quarry produced rock rip-rap shall have a current material test for rock rip-rap. All rock rip-rap shall be relatively free from seams, shale, soil, cracks, and other defects. The rock rip-rap test shall not have a bulk specific gravity less than 2.5. It shall not have more than 2% adsorption.

Any rock rip-rap load that doesn’t meet these requirements shall be rejected by the local TWRA representative and not allowed to be used in the construction of this fish barrier structure.

D. Remove or store residual material (stone) in coordination with TWRA representative.

X. INSTALLATION OF FINISHED GRADE AND STRATEGIC

MUCH/SEEDING

A. Vegetative Streambank Stabilization - For the partial bank section of streambank stabilization, constructed slopes from the top of the rock rip-rap to the top of the bank shall be seeded with a TWRA approved seeding mix. The seeding mix shall contain seeds for both temporary and permanent vegetative cover.

After seeding, slopes shall be covered with straw mulch. Coir matting shall be installed after the straw mulch is applied. 700 g/sqm coir matting shall be biodegradable, have an 18-month minimum longevity, and be capable of withstanding an unvegetated sheer stress of 4.0 psf and unvegetated velocity of 10.4 fps. Coir matting shall be staked according to the manufacturer’s installation instructions.

All stakes shall be biodegradable, have a minimum 1' length and be installed with a maximum spacing of 3'.

B. Critical Area and Straw Mulch - Critical Area seeding shall be used to stabilize all areas disturbed during construction not addressed under bioengineering or vegetative streambank stabilization. All critical areas where the topsoil has been stripped shall be capped with a minimum of 6” of topsoil and fertilized and limed according to soil test results.

The Critical Area seeding mixture shall be a season appropriate native grass mixture (see local TWRA representative for seeding dates by species) and contain seeds for both permanent and temporary grasses. All disturbed areas shall be mulched with small grain straw mulch at a rate of

2.5 tons per acre. The mulch placement shall be completed as soon as construction of the rock rip-rap revetment is completed.

Straw mulch shall be crimped by walking back and forth across the mulched areas with a tracked piece of equipment.

XI. RESTORATION OF NATURAL STREAM

A. See Appendix B. Stream shall be remediated to its pre-disaster condition.

XII. CLEAN UP AND DEMOBILIZATION

A. Construction Checkout

1. Verify and record dimensions of the fish barrier and streambank stabilizations.

a. Length, height (toe to top of bank) and face slopes of revetment, bioengineering, and vegetative streambank stabilization.

2. Construction pictures documenting geotextile in place, keyways, and typical or specialized rock placement.

3. Cross section survey with elevations, maximum spacing 100’.

4. Type and quality of geotextile used.

5. Type and quality of coir matting and burlap.

6. Documentation of appropriate coir matting anchoring including stake type, pattern, and spacing.

7. Gradation, quantity, and type of rock rip-rap used.

a. Pictures with an object for scale.

8. Adequacy of vegetation.

9. Other pertinent data to include, but not limited to: Precise height, length, and width measurements of the near vertical steep incline and scour pool.

10. Statement to the effect that practice meets plans and specification.

11. Final quantities of all materials by type and/or gradation.

12. Manufacturer’s specifications including product name.

13. Redlined As-built drawings noting any construction changes.

14. Signature of person making certification and date.

15. Verification of checkout compliance with TWRA representative.

XIII. DELIVERY

A. Contractor shall begin the project within thirty (30) calendar days from receipt of executed contract, B. Contractor shall call three (3) business days before beginning the project so that access arrangements can be made.

C. Contractor shall complete all work in the Specifications within sixty (60) days from a notice to proceed, barring any events beyond the Contractor’s control, such as weather.

• Please refer to Terms and Conditions section 7.27. Force Majeure.

D. Work shall not be completed on weekends, or legal holidays as declared by the Commissioner of the Tennessee Department of Human Resources

(“DOHR”).

E. TWRA points of Contact (for Post-Award Use Only):

a. Jim Habera at (423) 522-2459 or (865) 469-5011, or

b. Chris Haley at (629) 292-2610

APPENDIX A

Hampton Creek Trailhead, Hampton Creek Cove State Natural Area, Roan Mountain, TN 37687

GPS: 36.15234672054734, -82.05570086241627

Tuesday, October 14, 2025, at 10 AM (EST)

APPENDIX B

PRE-DISASTER CONDITION OF HAMPTON CREEK FISH BARRIER

36.14682361452202, -82.04917859342001