Appendix D sample vendor packet_Redacted.pdf

John.Paulin Rectangle

PARTRIDGE WRP

#66-6114-2-01B7J

ENGINEERING DESIGN REPORT

LOCATION –

SITE DESCRIPTION – Located adjacent to the , the restoration areas of this site are classified as riverine wetlands. The easement areas contain evidence of several old oxbows. There are three separate tracts included in this easement.

Soils are primarily 135 Coland, 485 Spillville, and 315 Alluvial Land. According to NRCS Soil Scientists Rick Bednarek and Doug Oelmann, this soil survey was fairly old and contained some inaccuracies. “Alluvial Land” was an old label meaning “too wet to farm” and thus not thoroughly evaluated. In this location, they felt the 315 map unit was probably a Coland. 135 and 485 were described as Occasionally Flooded, and 315 was Frequently Flooded.

ENGINEERING JOB CLASS - The easement includes 72 acres of hydric soils, about 18 of which have restoration construction activities on them, making this site a Job Class IV (less than 25 acres of wetland “project area”. It does not require IDNR construction or water storage permits, since there are no fills of 5 ft or more in height, no drainage areas > 10 sq mi, and no permanent water storage areas > 18 ac-ft.

RESTORATION GOALS AND RATIONALE - The goal for this project is to restore hydrology to pre-manipulation conditions.

SITE DESIGN COMPONENTS – The plan includes shallow water excavations (SWE) on each of the three tracts, and tile investigation on the south tract.

Site 1 (northwest tract): Two shallow water excavations were placed in the northeast and southwest portions of the treeless area of this tract, avoiding a power pole which sits in the middle of that area. SWE1 removes 0.5 to 1.0 ft of sediment from an existing depression. SWE2 follows a curve of an old oxbow section, removing about 1 to 1.5 ft of material. This excavation has a spillover depth of 1.2 ft.

Site 2 (northeast tract): The hillshade aerial images as well as the survey contours show a distinct old oxbow extending north-south across this tract. A series of shallow water excavations are located along this oxbow, with depths varying from 1 to 3 ft.

Site 3 (south tract): A larger shallow water excavation was placed in this tract, following the shape of old oxbows, with a depth of about 1 ft. This excavation is part of a larger depressional area, with a spillover depth of about 1.7 ft.

John.Paulin Rectangle

Tile search: Per field staff, tile is only expected in the southern tract. One investigation trench is located across the shallow water excavation. Any tile found will be broken and a minimum 50-ft section removed. Note that EFH Ch. 13 recommends tile block removal lengths ranging from 50 to 150 ft, depending on the soil type (shorter in clayey soils, longer in sandy soils). Bruce Atherton, Iowa Civil Engineer, and Rich Weber, Design Engineer in Ft Worth, both feel this guidance may be out-of-date, not technically supportable, and excessive in length for most situations. They feel tile break lengths should be based on water flow direction relative to the tile pattern, and other site conditions. Since the tiles expected to be found here are probably single lines following the water flow paths in drainageways, a relatively short length of tile break should be adequate.

Spoil locations and depths: Spoil piles from the excavations are located adjacent to the excavations, with a 30-ft separation. Since they are right on the flood plain near the creek, depth of spoil is limited to a maximum depth of 1.5 ft (assumed 1 ft average).

CONSTRUCTION – Survey and layout will be performed by NRCS personnel; construction inspection will be performed by Ducks Unlimited personnel.

Prepared by: Jean Sandstrom, Civil Engineer 11/12/2013

ITEM SPEC. UNIT

NO. WORK OR MATERIAL NO. QUANTITY UNIT PRICE AMOUNT

1 Mobilization -- 1 Job XXX $ 1,000.00 2 Seeding IA-6 13.1 Acres $ 600.00 $ 7,860.00 3 Tile Investigation IA-9 200 Lin. Ft. $ 2.00 $ 400.00 4 Tile Block Removal IA-9 2 Each $ 250.00 $ 500.00 5 Shallow Water Excavations IA-21 4.1 Acres $2,250.00 $ 9,225.00

TOTAL BID, WETLAND RESTORATION: $ 18,985.00

IOWA

COST ESTIMATE

Specification Number Title Pages

IA-1 Site Preparation 1 IA-5 Pollution Control 1 IA-6 Seeding/Mulching for Protective Cover 1 IA-9 Drainage Tile Investigation and Removal 1

IA-11 Removal of Water 1 IA-21 Excavation 1

These specifications are part of the construction plans. The work shall be performed in accordance with the drawings and specifications unless otherwise approved, in writing, by NRCS.

NATURAL RESOURCES CONSERVATION SERVICE

CONSTRUCTION SPECIFICATIONS

For

List of Specifications

NATURAL RESOURCES CONSERVATION SERVICE

CONSTRUCTION SPECIFICATION

IA-1 SITE PREPARATION

1. SCOPE

Site preparation work shall consist of clearing, grubbing, stripping, refuse removal, bank sloping and structure removal on the site as necessary to rid the site of all undesirable materials on or near the surface and prepare the site for the structure. All woody growth within the construction area shall be cleared and all stumps and roots one inch in diameter or larger shall be grubbed from the site. In addition, all areas within 25 feet of the footprint of the structure shall be cleared and grubbed except as directed by NRCS. The work shall also consist of the removal and disposal of structures (including fences) that must be removed to perform other items of work.

For wetland restoration, enhancement, or creation projects, the wetland area shall be disturbed as little as possible and existing naturally vegetated spillway areas shall not be disturbed.

2. FOUNDATION PREPARATION

The construction areas shall be stripped a minimum of 6 inches to remove all unsuitable materials such as organic matter, grasses, weeds, sod, debris, and stones larger than 6 inches in diameter.

In an earth embankment foundation area, all channel banks and sharp breaks shall be sloped to no steeper than 1.5 horizontal to 1 vertical.

The foundation area shall be thoroughly scarified before placement of fill material. The surface shall have moisture added or shall be compacted if necessary so that the first layer of fill material can be compacted and bonded to the foundation.

3. STRIPPED MATERIAL DISPOSAL

Suitable soil material shall be stockpiled for use as topsoil. The other stripped materials shall be buried, removed from the site, or disposed of as directed by the owner or NRCS. Whenever possible, material shall not be disposed of in the pool area created by the structure.

Stockpiled materials around a construction site should be placed so as not to hinder subsequent construction operations.

4. DISPOSAL OF REFUSE MATERIALS

Waste materials from clearing and structure removal shall be burned or buried at locations approved by the owner. Buried materials shall be covered with a minimum of 2 feet of earthfill. Whenever possible, material shall not be disposed of in any pool area created by the structure.

All refuse shall be disposed of in a manner which complies with all local and state regulations.

5. SALVAGE

Items to be salvaged shall be as shown on the drawings. Structures and fencing materials that are designated to be salvaged shall be carefully removed and neatly placed in the specified storage areas.

6. SPECIAL SPECIFICATIONS

Iowa IA-1-1 07/13

Iowa IA-5-2 02/11

4. CHEMICAL POLLUTION

The Contractor shall provide watertight tanks or barrels or construct a sump sealed with plastic sheets to be used to dispose of chemical pollutants, such as drained lubricating or transmission oils, greases, soaps, concrete mixer wash water, asphalt, etc., produced as a by-product of the construction work.

At the completion of the construction work, sumps shall be removed and the area restored without causing pollution.

Sanitary facilities such as chemical toilets or septic tanks shall not be placed adjacent to live streams, wells, or springs. They shall be located at a distance sufficient to prevent contamination of any water sources. At the completion of construction work, facilities shall be disposed of without causing pollution.

5. AIR POLLUTION

The burning of brush or trash or disposal of other materials shall adhere to local and state regulations.

Fire prevention measures shall be taken to prevent the start or the spreading of wild fires, which result from project work. Fire breaks or guards shall be constructed at locations shown on the drawings.

All public access or haul roads used by the contractor during construction of the project shall be sprinkled or otherwise treated to fully suppress dust. All dust control methods shall insure safe operations at all times. If chemical dust suppressants are used, the material shall be a commercially available product specifically designed for dust suppression and the application shall follow manufacturer's requirements and recommendations. A copy of the product data sheet and manufacturer's recommended application procedures shall be provided to the Engineer five working days before use.

6. MAINTENANCE, REMOVAL, AND RESTORATION

All pollution control measures and works shall be adequately maintained in a functional condition as long as needed during the construction operation. All temporary measures shall be removed and the site restored to as near original conditions as practical.

7. SPECIAL SPECIFICATIONS

Iowa IA-5-1 02/11

CONSTRUCTION SPECIFICATION

IA-5 POLLUTION CONTROL

1. SCOPE

The work shall consist of installing measures or performing work to control erosion and minimize the production of sediment and other pollutants to water and air during construction operations.

2. MATERIALS

All materials furnished shall meet the requirements shown on the drawings or in the specifications.

3. EROSION AND SEDIMENT CONTROL MEASURES AND WORKS

The measures and works shall include, but are not limited to, the following:

Staging of Earthwork Activities: The excavation and moving of soil materials shall be scheduled so that areas unprotected from erosion will be minimized. These areas will be unprotected for the shortest time feasible.

Seeding: Structures and disturbed areas shall be seeded as soon as possible after construction is completed.

Temporary seedings may be used as an alternative to other stabilization measures as approved by

NRCS.

Mulching: Construction areas that have been disturbed but have no construction activity scheduled for 21 days or more shall have erosion protection measures applied by the 14th day.

This erosion protection may be mulching or other approved temporary measures. Construction areas shall not be left open during a winter shutdown period and shall be protected by mulching.

All seeding and mulching shall be completed in accordance with the seeding plan and Iowa Construction Specification IA-6, Seeding and Mulching for Protective Cover.

The following works may be temporary. If they are installed as a temporary measure, they shall be removed and the area restored to its original state when they are no longer needed or when permanent measures are installed.

Diversions: Diversions may be required to divert clean runoff water away from work areas and to collect runoff from work areas for treatment and safe disposition.

Stream Crossings: Culverts or bridges may be required where construction equipment must cross streams.

Sediment Basins: Sediment basins may be required to settle and filter out sediment from eroding areas to protect properties and streams below the construction site.

Sediment Filters: Straw bale filters, geotextile sediment fences, or other equivalent methods may be used to trap sediment from areas of limited runoff. Sediment filters shall be properly anchored to prevent erosion under them.

Waterways: Waterways may be required for the safe removal of runoff from fields, diversions, and other structures or measures.

Iowa IA-6-1 02/11

CONSTRUCTION SPECIFICATION

IA-6 SEEDING AND MULCHING FOR PROTECTIVE COVER

1. SCOPE

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.

5. SPECIAL SPECIFICATIONS

Iowa IA-9-1 02/11

CONSTRUCTION SPECIFICATION

IA-9 DRAINAGE TILE INVESTIGATION AND REMOVAL

1. SCOPE

This work will consist of the investigation, location, and removal of drainage tile near new or existing animal waste storage or wetland restoration facilities.

2. INVESTIGATION AND LOCATION

An inspection trench at least 10 inches wide shall be dug at the location shown on the drawings or as directed by the engineer. The trench shall be at least 6 feet deep measured from the original ground line. The engineer shall examine the trench and excavated material to locate tile lines. Backfilling shall not be started without approval of the engineer. After inspection all trenches shall be backfilled.

3. TILE REMOVAL

On new facilities all tile lines located within the area bounded by the investigation trench shall be removed. Drainage tiles found upgrade from the structure shall be rerouted as directed by the engineer.

On existing animal waste facilities the owner shall contact the Iowa Department of Natural Resources (IDNR) for permission to remove the drainage tile under the structure. The structure shall be emptied of waste or lowered to a point below the tile prior to its removal. The structure must be retested for percolation and the results submitted to IDNR and approval received prior to reusing the structure.

An alternative to removing tile on existing facilities is to grout the entire length of tile with concrete or Portland cement grout.

4. SPECIAL SPECIFICATIONS

Iowa IA-11-1 02/11

CONSTRUCTION SPECIFICATION

IA-11 REMOVAL OF WATER

1. SCOPE

The work shall consist of the removal of surface water and ground water as needed to perform the required construction in accordance with the plans and specifications.

2. DIVERTING SURFACE WATER

The Contractor shall build, maintain and operate all cofferdams, channels, diversions, flumes, sumps, and other temporary protective works needed to divert surface water away from the construction site while construction is in progress.

3. DEWATERING THE CONSTRUCTION SITE

Foundations, cutoff trenches, borrow areas and other parts of the construction site shall be dewatered as needed for proper execution of the construction work. The Contractor shall furnish, install, operate and maintain all works and equipment needed to perform the dewatering.

4. EROSION AND POLLUTION CONTROL

Removal of water from the construction site, including the borrow areas shall be accomplished in such a manner that erosion and the transmission of sediment and other pollutants are minimized.

5. REMOVAL OF TEMPORARY WORKS

After temporary works have served their purposes and before the Contractor leaves the site, they shall be removed.

6. SPECIAL SPECIFICATIONS

Iowa IA-21-1 02/11

CONSTRUCTION SPECIFICATION

IA-21 EXCAVATION

1. SCOPE

The work shall consist of the excavation required by the drawings and specifications and disposal of the excavated materials.

2. USE OF EXCAVATED MATERIALS

Suitable materials from the specified excavations shall be used in the construction of required permanent earth fill. The suitability of materials for specific purposes shall be determined by the NRCS Inspector.

3. DISPOSAL OF WASTE MATERIAL

All surplus or waste material shall be disposed of in areas shown on the drawings or as approved by the NRCS Inspector. The waste material shall be smoothed and sloped to provide drainage.

4. STRUCTURE AND TRENCH EXCAVATION

Structure or trench excavations will conform to all safety requirements of OSHA.

5. BORROW EXCAVATION

When the quantities of suitable materials obtained from specified excavations are insufficient to construct the specified fills, additional materials shall be obtained from the designated borrow areas as shown on the drawings or as approved by the NRCS and the landowner.

Borrow areas shall be excavated and grading completed in a manner to eliminate steep or unstable side slopes or hazardous or unsightly conditions.

6. OVER-EXCAVATION

Excavation beyond the specified lines and grades shall be corrected by filling the resulting voids with compacted earthfill, except that if the earth is to become the subgrade for riprap, sand or gravel bedding or drainfill, the voids shall be filled with material conforming to the specifications for the riprap, bedding or drainfill, as appropriate.

7. SPECIAL SPECIFICATIONS