Heartland Reinbeck Batch and Build Construction Specs.pdf
PDF 8 MB Posted
- Attached to
- Heartland Reinbeck Batch and Build Project
- Solicitation number
- EOF 2025-01
- Issued by
- Floyd County, Iowa
About this file
This construction specifications document, prepared by the USDA Natural Resources Conservation Service (NRCS) in partnership with the Iowa Department of Agriculture & Land Stewardship, Division of Soil Conservation and Water Quality, outlines technical requirements for seeding, mulching, and critical area planting work on the Heartland Reinbeck Batch and Build Project. The project involves environmental infrastructure construction including 4 bioreactors and 14 saturated buffer structures in Grundy and Tama County, Iowa. Specifications detail seedbed preparation requirements, including fertilizer and lime application to the top 3 inches of soil, with minimum loosening depth of 3 inches on standard slopes and adjusted requirements for slopes steeper than 2.5:1 horizontal to 1 vertical. Seeding operations must be performed immediately following seedbed preparation using uniform distribution equipment, with mulching (straw from cereal grains or hay) completed within 24 hours of seeding and anchored through mechanical or netting methods. A pre-bid conference is scheduled for May 20, 2025, at 10:00 AM at Heartland Co-Op in Lincoln, Iowa, with written questions due by 3:00 PM on May 29, 2025, and sealed bid submissions due June 5, 2025, at 3:00 PM CDT, followed by public bid opening at 3:15 PM CDT.
Bidders must submit proposals with a mandatory 10% bid bond and provide a Performance/Payment Bond equal to 100% of the contract price upon award. The estimated project budget ranges from $355,000 to $385,000. All work items include labor, equipment, mulch, and fertilizer costs, with measurement and payment calculated to the nearest hundredth of an acre of seeded area. Fertilizer requirements follow Iowa State University guidelines, with specifications for nitrogen application (50 lbs per acre for non-native seedings), phosphorus, potassium, and lime to achieve minimum pH 6.0 at 3-inch depth, though requirements may be waived for sites less than 1 acre or where equipment cannot access the site. Bidders must be registered with the Iowa Division of Labor, and the division reserves the right to reject any or all proposals and waive technicalities and irregularities.
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Text version
2. Topsoil stripping is subsidiary to Bid Item No. 9 Topsoil Stripping
USDA
United States Natural Resources Conservation Service
1. SCOPE
Department of
Agriculture Construction Specification
000 IA-6 Seeding and Mulching for Protective Cover
The work shall consist of seeding, mulching, and fertilizing all disturbed areas and other areas as indicated on the drawings or otherwise designated.
2. SEEDBED PREPARATION AND APPLICATION
The entire area to be seeded shall be reasonably smooth and all washes and gullies shall be filled to conform to the desired cross-section before actual seedbed preparation is begun. At this stage of the operation, the required fertilizer and lime shall be applied uniformly and incorporated into the top 3 inches of the soil with suitable tillage equipment. The seedbed preparation operation shall be suspended when the soil is too wet or too dry. The seedbed shall be loosened to a depth of at least three inches.
On side slopes steeper than 2-1/2 horizontal to1 vertical, the 3 inch minimum depth of seedbed preparation is not required, but the soil shall be worked enough to insure sufficient loose soil to provide adequate seed cover.
Unless otherwise specified, the seeding operation shall be performed immediately after preparation of the seedbed. The seed shall be drilled or broadcast by equipment that will insure uniform distribution of the seed.
3. MATERIALS
The seeding, fertilizing, and mulching requirements are as specified on Form IA-CPA-4.
Straw from cereal grains or hay will be used as mulching material. It shall be relatively free of weeds.
4. MULCH APPLICATION
The required mulching shall be performed as soon as possible after seeding unless otherwise specified.
The mulch shall be applied uniformly over the area. The type and rate shall be as specified. When mulching is required, all areas seeded during any one day shall be mulched within 24 hours. The mulch may be spread by any means that results in a uniform cover.
The mulch shall be anchored. Anchoring of the mulch may be performed by a mulch anchoring tool or regular farm disk weighted and set nearly straight, by installation of mulch netting, or by other methods approved by NRCS.
NRCS, IA SPECIFICATION - Page 1 of 2 February 2011
Refer to plans for further details. Measurement and payment shall be to the nearest hundredth of an acre of seeded area. Item includes all labor, equipment, mulch, and fertilizer required to complete the work.
Emalyn Polz Rectangle
Emalyn Polz Rectangle
Emalyn Polz Rectangle
USDA
- United States Department of Agriculture
Critical Area Planting Iowa Implementation Requirements
Natural Resources Conservation Service Iowa Conservation Practice 342
Des Moines, Iowa June 2017 revised October 2022
Definition Establishing permanent vegetation on sites that have or are expected to have high erosion rates, and on sites that have physical, chemical or biological conditions that prevent the establishment of vegetation with normal practices.
Purpose ► Stabilize areas with existing or expected high rates of soil erosion by water and wind.
► Stabilize areas, such as sand dunes and other riparian areas.
► Stabilize stream and channel banks, ponds and other shorelines, and earthen features of structural conservation practices.
Condition Where Practice Applies This practice applies to highly disturbed areas, such as: active or abandoned mined lands; urban restoration sites;
construction areas; conservation practice construction sites; eroded banks of natural and constructed channels and lake shorelines; areas needing stabilization before or after natural disasters, such as floods, hurricanes, tornadoes and wildfires; and other areas degraded by human activities or natural events.
Criteria for Conservation Cover
A. Seeding Periods
Permanent, perennial vegetative cover and/or trees will be established during the first recommended seeding or planting period for the selected species or mixture. Planting dates are outlined on Table 1 of this implementation requirement. Planting immediately after construction of earthen structures such as terraces, grade stabilization, or ponds may be completed at the discretion of the Conservation Planner with Job Approval Authority.
B. Fertilizer and Lime Requirements
No fertilizer requirement for seedings that are predominantly native. Apply 50 lbs per acre of Nitrogen and follow Iowa State University PM-1688 to apply phosphorus, potassium and lime (lime to a minimum target pH of 6.0 at a 3 inch depth) based on a soil test.
When a current soil test is not available, apply 50 lbs P2O5 per acre, 50 lbs K.2O per acre and 1000 pounds per acre ECCE lime. Fertilizer requirements may be waived at the discretion of the Conservation Planner with Job Approval Authority on sites:
• Less than 1 acre in size.
• Where application equipment cannot access the site (i.e. steep sides of terraces, grade stabilization, ponds).
• Field practices, such as waterways, when soil tests for adjacent cropland is at optimum or higher.
USDA is an equal opportunity provider, employer and lender. www.ia.nrcs.usda.gov 342-1
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: SATURATED BUFFER
: DENITRIFYING BIOREACTOR
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