Scope of Work - FY26 Darke W.A. Wetland Repairs_Final.pdf

Name or Title of the Service or Supply: Darke Wildlife Area Wetland Embankment Repairs & Water

Control Structure Replacements

Ordering Division and address: Ohio Division of Wildlife; Darke Work Unit, 1989 Northern Rd., Somerville, OH 45064

Project Overview: Wetland Embankment Repairs & Water Control Structure Replacements

The ODNR, Division of Wildlife is seeking contractors to remove vegetation, repair wetland embankments, and replace water control structures on two (2) wetlands at Darke Wildlife Area located in Greenville, Darke County, Ohio. Wetland #s 273 and 274. Figures 1 and 2. Must bid on each wetland site individually and include a combined total. Individual site bids are for budget estimation purposes and award may not include all sites. All contractors are required to visit the site per the directions under the Site Visit & Point of Contact section.

Figure 1: Vicinity Map

Figure 2: Wetlands 273 & 274 Close Up

A. Scope of Work

1) Embankments - Two (2) wetlands, Wetlands 273 & 274. (Please refer to Figures 1 & 2)

a. Prior to the execution of any work, the Contractor shall

i. Survey & Field verify all dimensions Including elevations and quantities

1. Confirm location of the existing water control structures in the dike

2. Confirm Inlet elevation of existing pipe

ii. Submittals (All products are to be new not used)

1. N-12 culvert pipe

2. Agri-drain and components (Please refer to Figure 3)

3. Stainless Steel Rat Guards (Please refer to Figure 4)

4. Standard Yellow Bar Guard (Please refer to Figure 5)

5. Seed

6. Offsite soil material (clay)

iii. Compaction

1. Unless otherwise recommended by manufacturer’s instructions, (i.e. Agri Drain;

Please refer to Figure 6), all repaired areas are to be compacted in max. of 6” lifts with equipment such as a sheepsfoot roller.

Figure 3: Agri Drain Cover Sheet

Figure 4: Rat Guard Cover Sheet

Figure 5: Standard Yellow Bar Guard Cover Sheet

Figure 6: Agri Drain Inline Water Control Structure Installation Instructions

b. Preparatory work

i. Remove and dispose of all trees, shrubs including root balls on dike slopes and tops

1. Trees 5 inches DBH and greater shall only be removed between October 1st, 2025 and March 31st, 2026.

ii. All dikes shall be cleared of all woody vegetation on the downstream slopes from crest to 10 feet beyond the toe, and between the crest and waterline on the upstream slopes.

1. Wetland 273 is approximately 385 LF long (to be confirmed at Job walk).

2. Wetland 274 is approximately 700 LF long (to be confirmed at Job walk).

iii. Within 10 LF of the toe, all woody vegetation (trees and shrubs) shall be cut to within 1 inch of ground level or lower.

iv. Organic debris and soils except root balls can be disposed on ODNR site, but not in wetlands, dikes, trails, or roadways.

1. Root balls shall be removed off site and properly disposed of by contractor

2. Locations to be coordinated with ODNR

3. Large trees can be moved to adjacent areas

4. To provide better wildlife cover, the brush piles shall NOT be placed into tight piles with the trunks all running in one direction, but Instead, using the larger trees cut down as a base for the piles with the smaller brush piled loosely on top.

v. Both wetland dikes have multiple rodent burrows to repair, this may include a partial new clay core defined below.

vi. Identify and repair other defects in the dike earth portion of the structure

vii. Develop and execute erosion plan in compliance with applicable Local, State, and Federal requirements.

c. Excavate the existing core at control structure and where rodent burrows impacted the core

i. All the depth of the key are 2 feet below the lowest point of Wetland Depth

ii. Width – New core guideline-width of excavation is up to Contractor to achieve.

1. Trenches up to 12-feet deep are 12” wide core

2. Trenches 13-feet deep or deeper are 18 inches wide core.

3. Reuse of the excavated clay core is acceptable

4. Addition material if required needs to be provided by the contractor

5. It is assumed the existing dike’s key are made by clay

d. New Clay core at the removal of existing control structures being demoed and new control structures installed

i. Install in 6” lifts

ii. Set up at 95% Compaction per established levels

iii. Fill all voids and to width of excavated to maintain the minimum width

iv. Coordinate the work around the control structure installation

v. Contractor shall conduct field compaction test and document results in Daily reports

vi. ODNR does not plan to have an outside testing agency to confirm the contractor is meeting the above. But does reserve the right to conduct random proctor test to confirm at their expense. If test is found to the contractor not meeting 95% that section will be removed and reinstalled at the contractor’s expense including the cost of test.

e. Control Structure

i. Demo and safely dispose (offsite) of the existing structures and pipe

1. Confirm Inlet elevation of existing pipe prior to demo

ii. Procure the preferred Agri Drain product and N-12 Culvert Pipe

1. Water Control Structures (WCS) will be of different size than existing structures.

a. new WCS shall be inline style, w/ twelve (12) inch inlet & outlet for N-12 pipe

b. Contractor to determine height of WCS to meet specs in 1.e(v)(1) below.

c. N-12 pipe to be 12” double wall smooth interior and corrugated exterior.

2. Connect to 12” corrugate N-12 Culvert Pipe using couplers

3. Install per Manufacturers instruction at the demo locations

a. Structure base, inlet pipe, & outlet pipe must be set on compacted soil or fill sand to provide a solid, stable base.

b. Install at same inlet elevation as existing WCS pipe

c. Hand Compaction around Structure

d. Level and plumb

iii. A large rock (24” or larger) shall be placed on either side of the control structure to prevent mowers from hitting the structure.

iv. The control structure shall be set at the same height as the existing structure.

v. Inlet and outlet pipe to be installed the full width of the dike

1. The inline water control structure needs to be placed at the point on the interior slope where most of the control structure riser is enclosed in the dike and the top will stick out a maximum of 12 inches in height above the dike crest and shall not be placed in the middle or crest of the embankment (i.e., the “shoulder” of the dike).

2. The inlet will be 5 feet past the dike toe into the wetland

3. Mechanically fasten and tile tape all joints per manufacturer’s instructions to provide a watertight seal

4. Inlet pipe within the wetland pool area shall be staked or have the outer wall cut to prevent the pipe from floating

5. Provide and Install Guards on pipe, and provide narrow stoplog retainers

a. Inlet - standard yellow bar guard (Agri Drain item # BG12)

b. Outlet – Stainless Steel Rat Guards (Agri Drain# RGSS12)

c. Narrow Stoplog Retainer – Quantity of 2 (Agri Drain # 701300)

vi. On the outlet side

1. Outlet pipe will be buried with sufficient soil cover until the pipe exits from the dike at the toe of the dike, with straight pipe flowing onto the splash block

2. Pipe is to go past the toe

3. Sloped to drain to outlet

4. Properly supported by earthwork or rip rap

5. Minimum of 5’ x 5’ Type D rip rap, – or splash block is to be installed under and in front of outlet to prevent soil erosion.

f. Dike top and slopes

i. Wetland side

1. Maintain existing slope if under Three (3) to One (1) or re-grade to achieve 3 to 1 slope.

ii. Drain side

1. Maintain the existing slope if under Three (3) to One (1) or re-grade to achieve 3 to 1 to enable safe mowing conditions.

iii. Dike top

1. Maintain the existing dike height and width

iv. All - Fill in void: due to but not limited to:

1. Water erosion, animals, root ball, existing pipe and control structure

2. Add topsoil where necessary.

3. Re-grade the disturbed surfaces to a level & smooth condition.

4. Re-seed utilizing the attached seed specification

5. Additional fill material (Including Clay) required will be the responsibility of the contractor and shall be appropriate for the repairs and stability of the dikes. ODNR will direct the contractor where to obtain the fill material- previous borrowed areas that have been surveyed for SHPO clearance.

6. Install geotextile fabric and rock on graded surface around the control structure and where the pipes enter and leaves the sidewall 2’ outside the dimension, to mitigate mowing near these structures.

a. Install a 6” thick bed of #2 limestones (Baseball to softball size) over the geotextile fabric.

g. Site Conditions

i. At the job walk evaluate site and the equipment requirement to mitigate conditions to and from the site and at the 2 sites.

1. Any ground disturbance must be kept to a minimum

2. If ruts exceed 6 (six) inches in depth regularly, the Contractor(s) must stop work immediately. ODNR will have the final say on “regularly”.

3. All access roads and dikes need to be returned to existing conditions or better at the conclusion of the project.

ii. Repair all surfaces damaged by the contractor including reseeding

iii. Contractor shall fine grade as required above

1. ODNR review prior to straw coverage

iv. Reseed (using the mix below) with a straw covering.

1. Orchard Grass 30 lbs./acre

2. Red Clover 10 lbs./acre

3. Perennial Ryegrass 20 lbs./acre

4. Annual Ryegrass 10 lbs./acre

5. Timothy 10 lbs./acre

6. Kentucky Bluegrass 20 lbs./acre

7. Fertilizer 16-16-16 250 lbs./acre

8. Straw Mulch 50 bales/acre

v. Submittal required on the seed mixture and acres to be covered

h. Demobilization

i. Prior to demobilizing the equipment,

1. ODNR needs to review the site conditions

2. Sign off on the Installation

Evaluation. The contract will be awarded to the lowest responsive and responsible bidder as determined by the State. All Proposals must be submitted through Ohio Buys. Proposals received outside of Ohio Buys will not be considered.

Contract Award. Must bid on each wetland site individually and include a combined total. Individual site bids are for budget estimation purposes and award may not include all sites. The contract will be awarded to the lowest responsive and responsible bidder by low lot total. Low lot total will be determined by multiplying the unit cost by the estimated usage listed in the bid and then adding each of the totals together to arrive at a total for all items. Failure to bid all items may result in the bidder being deemed not responsive

Prevailing Wage.

Prevailing Wage. The bidder shall base its Bid upon the prevailing rates of wages as ascertained by the

Ohio Department of Commerce, Wage and Hour Bureau for the Project as provided in ORC Section

4115.03 through 4115.14. The Bidder shall not be entitled to an increase in the Contract Sum on account of an increase in prevailing wage rates, except as otherwise provided by Applicable Law. The Bidder is responsible for the compliance of its Subcontractors with prevailing wage requirements. Within 10 days of the date of the Notice to Proceed, the Contractor shall provide the Contracting Authority’s Prevailing

Wage Coordinator with a schedule of dates during the term of the Contract when the Contractor shall pay wages to its employees for the Project.

If the Project is being funded in part with federal funding, Davis Bacon Wages Rates (Davis-Bacon Act (40

U.S.C. 3141-3148) and 2 CFR 200 Appendix ll (D)) may apply. In that instance, Davis Bacon Wage Rate will be substituted for the State of Ohio Prevailing Wage Rates. Please use the State of Ohio prevailing wage rates for the basis of the bid unless the instructions to bidders clearly indicate that the project will require the payment of the federal wage rates.

Site Visit & Point of Contact

A pre-bid site visit meeting is scheduled for October 28th, 2025, at 10:00 AM EST, at the project location, Darke Wildlife Area Parking Lot, New Harrison Bradford Rd., Bradford, OH 45308

40.12127616290741, -84.51886290742254 https://maps.app.goo.gl/2iP5SsTmhS7MHgi8A

Attendance of the pre-bid site visit meeting by a representative of the bidder is a requirement of this bidding process. Failure to attend the pre-bid site visit meeting will result in a disqualified bid. To make arrangements for the pre-bid site visit meeting, please contact Bruce Terrill by phone: (937-347-0922), or by email at Bruce.Terrill@dnr.ohio.gov Once a contract is awarded, failure of the bidder to have requested a site visit to become familiar with the facility and requirements of the bid will be insufficient reason to support any request to be released from the contract.

Bill to information:

a. Please Print Origin N22 On Invoice

b. All invoices must be submitted DIRECTLY to Financial Shared Services (FSS).

c. There are two options available to submit invoices to FSS:

d. EMAIL the invoice to: invoices@ohio.gov

f. MAIL the invoice to: Financial Shared Services, PO Box 182880, Columbus, Ohio 43218-2880

g. In order for your invoice to be processed, please make sure all the required information is on your invoice before submitting it to FSS or they will be returned for not being a proper invoice.

h. Each invoice and associated documentation must be a separate file and must be in the .pdf or .jpg format

i. Must include The PO number assigned. You may shorten it to the last five digits

j. Suppliers Full name as it appears on your Purchase Order (PO)

k. The Ship to and/or service facility name and full address;

l. Unique Invoice number

m. Date of service or date work was completed.

n. Complete itemization of services performed, materials or goods supplied and or labor furnished.

o. Line charge(s), if parts are included, please break out the line charges with product and charges separately

p. No sales tax;

q. Remit address that matches our records for payment.

https://maps.app.goo.gl/2iP5SsTmhS7MHgi8A mailto:Bruce.Terrill@dnr.ohio.gov mailto:invoices@ohio.gov