Spec 32 92 19 Dwg_Attachments_8.21.23.pdf

SECTION 32 92 19

SEEDING

08/23

PART 1 GENERAL

Contractor shall prepare ground surfaces, and plant native prarie, upland buffer, or smooth brome seed m ixes on existing and graded ground surfaces and as directed by the CO R, the Contractor shall take special precautions to ensure weed plants are controlled during all phases of construction as required in paragraph 3.2 PREPARATION. Additional erosion control material shall be placed as described herein.

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only.

AGRICULTURAL MARKETING SERVICE (AMS)

AMS-01 Federal Seed Act Regulations Part 201

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government.

SD-01 Preconstruction Submittals

Equipment ;

A listing of equipment to be used for the seeding operation.

Delivery ;

Delivery schedule.

SD-03 Product Data

Seed; G-AO.

Prior to purchasing of seed a complete listing of seed varieties (common name and botanical name) available for use. Prior to the delivery of materials, certificates of compliance attesting that materials meet the specified requirements. Certified copies of the material certificates shall include the following:

a. Seed. Classification, botanical name, common name, percent pure live seed, minimum percent germination and hard seed, maximum percent weed seed content, and date tested. Signed statement certifying that seed mixtures have been tested within the last 6 months prior to the date of delivery for seed type, and weed content.

b. Mulch. Composition and source.

Erosion Control Materials ; G

Prior to purchasing, the contractor shall submit data sheets of the proposed erosion control materials, which shall include all relevant physical properties and the manufacturer's recommendations for installation.

SD-07 Certificates

Seed Mixture ; G, DO-Geotech

1. 3 DELIVERY, INSPECTION, STORAGE, AND HANDLING

1. 3.1 Delivery

Deliver to the site in original, unopened containers bearing manufacturer's seed analysis, name, trade name, trademark, and indication of conformance to state and federal laws. Protect from drying out and from contamination during delivery, on-site storage, and handling.

1. 3.1.1 Topsoil

The Contractor shall utilize topsoil from surrounding undamaged areas and must blend topsoil into existing grades.

1. 3.2 Inspection s

Seed shall be inspected upon arrival at the job site for conformity to species and quality. Seed that is wet, moldy, or bears a test date six months or older, shall be rejected. Other materials shall be inspected for compliance with specified requirements. The following shall be rejected: soil for seeding purposes that contains slag, cinders, stones, lumps of soil, sticks, roots, trash or other material over a minimum 2 inches diameter; and soil that contains viable plants and plant parts.

Unacceptable materials shall be removed from the job site.

1. 3.3 Storage

Materials shall be stored in designated areas. Seed shall be stored in cool, dry locations away from contaminants.

1. 3.4 Handling

Except for bulk deliveries, materials shall not be dropped or dumped from vehicles.

1.4 WARRANTY

All seeded areas shall be guarranteed for one year beginning on the date of inspection by the COR to commence the plant establishment period except for defects resulting from abuse by the Government or by weather conditions unusal for the warranty period.

Remove and replace dead planting materials immediately unless required to plant in the succeding planting season. At the end of the warranty period, replace seeded areas where more than 20 pecent of the planting materals have died during maintenance operations or the guarantee period.

PART 2 PRODUCTS

2.1 SEED

2.1.1 Permanent Seed Species and Mixtures

Permanent seed species and mixtures shall be proportioned by weight:

Computation of quantity of seed required is based on the percent of purity and percent of germination. Pounds of pure live seed (PLS) = pounds of seed x germination x purity.

Smooth Brome Mix

Botanical Name Common Name Pounds PLS/Acre

Bromus inermus Smooth Brome Grass 40.0 Festuca arundinaceae K-31 Tall Fescue 10.0 Panicum Virgatum Switchgrass 4.0 Avena sativa (Nurse Crop) Common Oats (VNS) 25.0 Total 79.0

NATIVE SEED MIXES:

Native Prarie Mix

Botanical Name Common Name Pounds PLS/Acre

Elymus canadensis Canada wildrye 1.0 Elymus virginicus Virginia wildrye 0.50 Bouteloua curtipendula Sideoats Grama 1.50 Pascopyrum smithii Western Wheatgrass 1.0 Panicum virgatum var KANLOW Switchgrass 1.0 Sporobolus heterolepis Prairie Dropseed 1.50 Koeleria macrantha Prairie Junegrass 0.10 Helenium autumnale Common sneezeweed 0.25 Asclepias syriaca Common milkweed 3.0 Rudbeckia subtomentosa Sweet coneflower 0.75 Spartina pectinata Prairie cordgrass 1.75 Andropogan gerardii Big bluestem 1.0 Eryngium yuccifolium Rattlesnake master 4.0 Monarda fistulosa Wild bergamot 0.10 Sorghastrum nutans Indiangrass 0.50 Avena sativa (Nurse Crop) Common oat 20.0 Total: 37.95

Upland Buffer Area Mix

Botanical Name Common Name Pounds PLS/Acre

SPECIES:

Elymus canadensis Canada wildrye 4.0 Elymus trachycaulus Slender wheatgrass 4.0 Pascopyrum smithii Western wheatgrass 4.0 Eragrostis trichodes Sand lovegrass 0.25 Andropogon gerardii Big bluestem 3.0 Spartina pectinata Pararie cordgrass 0.60 Panicum virgatum Switchgrass 1.0

Sorghastrum nutans Indiangrass 2.5 Bouteloua curtipendula Sideeoats grama 3.0 Schizachryium scoparium Little bluestem 2.0 Avena sativa/Triticum aestivum Common oat/wheat 12.0/19.0

Total: 36.35/43.35

2.1.2 Temporary Seed Grass Species

Temporary seed species for seeding finished graded surfaces outside of allowable permanent grass seeding dates and for surface erosion control or overseeding shall be Common Oats (Spring) or Annual Rye (fall)(Certified) seeded at a rate 96 pounds per acre.

2.1.3 Quality

Weed seed shall be a maximum 1 percent by weight of the total mixture.

2.1.4 Seed Mixing

The mixing of seed may be done by the seed supplier prior to delivery.

2.1.5 Substitutions

Substitutions will not be allowed without written request and approval from the Contracting Officer.

2.3 WATER

Water shall be the responsibility of the Contractor, unless otherwise noted. Water shall not contain elements toxic to plant life.

PART 3 EXECUTION

3.1 INSTALLING SEED TIME AND CONDITIONS

3.1.1 Seeding Time

The following describes the requirements for establishing vegetative cover and erosion control once final grading is complete. Seed all areas within the project limits disturbed by seeding activities that are not indicated to be seeded otherwise. Do not plant when the ground is frozen, snow covered, muddy, or when air temperature exceeds 90 degrees Fahrenheit.

Apply seed within twenty four hours after seed bed preparation. Planting dates are as follows.

Planting Season Planting Dates

Dormant Season October 15 thru February 28 Spring Season April 1 thru May 31 Fall Season August 1 thru September 15 Temporary Seeding June 1 thru July 31 (summer), and September 16 thru October 15 (fall)

Dormant seeding with the permanent seed mix will be necessary for this contract. Dormant seeding may occur from October 15 through February 28th. However, dormant seeding during that timeframe shall only be conducted if the soils temperatures are below 50 degrees. Seeding installed using Dormant seeding does not relieve the contractor of requirements in Paragraph 3.6 SEED ESTABLISHMENT PERIOD.

3.1.2 Seeding Operations

Seeding operations shall be performed only during periods when beneficial results can be obtained. When drought, excessive moisture, or other unsatisfactory conditions prevail, the work shall be stopped when directed. When special conditions warrant a variance to the seeding operations, proposed alternate times shall be submitted for approval.

3.1.3 Equipment Calibration

Immediately prior to the commencement of seeding operations, calibration tests shall be conducted on the equipment to be used. These tests shall confirm that the equipment is operating within the manufacturer's specifications and will meet the specified criteria. The equipment shall be calibrated a minimum of once every day during the operation. All equipment shall be cleaned between utilizing the smooth brome seed mix, and the native prarie and upland buffer seed mixes to prevent cross contamination. The calibration test results shall be provided within 1 week of testing.

3.2 PREPARATION

3.2 .1 Extent of Work

The seeding areas shall be moved and seeded with no-till drilling equipment. For areas where erosion rills are present provide rough and final grading using topsoil from adjacent undisturbed areas , soil preparation, topsoiling, discing or tilling of existing surface soils to incorporate thin layers of sediment and to loosen and prepare the soil to a smooth surface. Seed all newly finished earth surfaces, unless indicated otherwise, and all areas inside or outside the limits of seeding operations that are disturbed by the Contractor's operations.

3.2.1.1 Soil Preparation

Once final grades are complete and approved by the Contract Officer, seeding shall occur within 24 hours of soil preparation. Remove debris and stones larger than 2 inch in any dimension remaining on the surface after finish grading. Protect finished topsoil areas from damage by vehicular or pedestrian traffic.

3.2.2 Site Preparation

All soil areas which will remain undisturbed for more than 30 days shall be seeded with temporary seed grass as specified.

3.2.3 Finished Grade and Topsoil

The Contractor shall verify that finished grades are blended into existing grading , and compaction requirements have been completed prior to the commencement of the seeding operation. Prior to seeding operations the soil shall be tilled to a depth of no less than 6 inches to allow root penetration in all areas that have been compacted by construction equipment.

3.2.3 Tillage

Soils shall be tilled or scarified to a depth of 6 inches or as otherwise indicated on the drawings. Drainage patterns shall be maintained as indicated on drawings. Areas compacted by construction operations shall be completely pulverized by tillage.

3.2.4 Mowing

No tilling is required for the seeding areas where no fill is required;

instead, remove all debris and closely mow the existing vegetation to no greater than 2 inches in height.

3.2.5 Prepared Surface

The prepared surface shall be a maximum 1 inch below the adjoining grade of any surfaced area. New surfaces shall be blended to existing areas.

The prepared surface shall be completed with a light raking to remove debris.

3.2.6 Field Area Debris

Debris and stones over a minimum 2 inch in any dimension shall be removed from the surface.

3.2.7 Protection

Areas with the prepared surface shall be protected from compaction or damage by vehicular or pedestrian traffic and surface erosion.

3.3 INSTALLATION

Grass seeding shall occur as specified herein as soon as the soil has been prepared and the environmental conditions are favorable for installation. Prior to installing seed, any previously prepared surface compacted or damaged shall be reworked to meet the requirements of paragraph 3.2 PREPARATION. Seeding operations shall not take place when the wind velocity will prevent uniform seed distribution.

3.3.1 Installing Seed

All areas to be seeded shall be drill seeded except for any areas which are only accessible to broadcast seeding. COR approval must be obtained prior to the use of broadcast seeding. Seeding procedure shall ensure even coverage. Drill seeded areas shall be seeded at the rates required under paragraph Permanent Seed Species and Mixtures .

3.3.1.1 Drill Seeding

Seed shall be uniformly drilled to a maximum 1/2 inch depth using seeders appropriate for the type of seeds spread. Row markers shall be used with the drill seeder.

3.3.1.2 Broadcast Seeding

Seed shall be uniformly broadcast using broadcast seeders. Seed shall be broadcast at twice the rate specified for drill seeding. Half the total rate of seed application shall be broadcast in one direction, with the remainder of the seed rate broadcast at 90 degrees from the first direction. Seed shall be covered a maximum 1/2 inch depth by light raking or other approved device.

3.3.1.3 Rolling

The entire area shall be firmed with a roller not exceeding 90 pounds per foot roller width. Slopes over a maximum 3-horizontal-to-1 vertical shall not be rolled. Areas seeded with seed drills equipped with rollers shall not be rolled.

3.3.2 Watering Seed

Watering of seeded areas is not required.

3.4 PROTECTION OF TURF AREAS

Immediately after seeding and mulching, protect areas against traffic and other use by the use of appropriate signage or fencing.

3.5 RESTORATION

Restore to original condition existing turf areas which have been damaged during turf installation operations at the Contractor's expense.

3.6 SEED ESTABLISHMENT PERIOD

3.6.1 Commencement

The seed establishment period to obtain a healthy stand of grass plants shall end 4 months from the beginning of the spring seeding period.

Written calendar time period shall be furnished for the seed establishment period. When there is more than 1 seed establishment period, the boundaries of the seeded area covered for each period shall be described.

The seed establishment period shall be modified for inclement weather, shut down periods, or for separate completion dates of areas.

3.6.2 Satisfactory Stand of Grass Plants

Grass plants shall be evaluated for species and health when the grass plants are a minimum 6 inches high but no less than 120 days after start of seed establishment period.

3.6.2.1 Field Seeded Areas

A satisfactory stand of grass plants from the seeding operation shall be defined as consisting of 100 grass plants per square foot. Bare spots shall be a maximum 6 inches square. Bare spots shall be a maximum 5 percent of the total seeded area for any one acre of seeded land.

3.6.3 Maintenance During Establishment Period

Maintenance of the seeded areas may include mowing, eradicating weeds, insects and diseases; protecting embankments and ditches from surface erosion; maintaining erosion control materials; protecting installed areas from traffic.

3.6.3.1 Maintenance

Maintain seeded areas immediately after placement until grass is well established and exhibits a vigorous growing condition for the length of the establishment period. Maintenance may consist of mowing, erosion repair, and reseeding of bare spots as required to achieve a vigorous growing condition.

3.6.3.2 Repair or Reinstall

Unsatisfactory stand of grass plants and/or mulch shall be repaired or reinstalled, and eroded areas shall be repaired as soon as possible in accordance with paragraph 3.2 PREPARATION within 14 days of notification from the Contracting Officer. Method of reestablishment shall be either complete reseeding and mulching, overseeding, remulching as determined by the Contracting Officer.

3.6.3.3 Maintenance Records

A record of each site visit shall be furnished, describing the maintenance work performed; areas repaired or reinstalled; and diagnosis for unsatisfactory stand of grass plants.

3.7 SURFACE EROSION CONTROL

Erosion control materials will not be required to be utizlied in this contract. If Erosion Control materials are utilized, Erosion Control material shall consist of Erosion Control Blanket (ECB) material as described below. Product sheets for all materials to be used shall be submitted to the COR for review and approval.

3.7.1 Erosion Control Blanket (ECB)

Erosion Control Blankets will not be required to be installed in this contract. If the Contractor deems it neccessary to install ECB, COR approval must be obtained. IF ECB are used, ECB shall be installed within 24 hours of seeding, in accordance with manufacturer's instructions.

Placement of the material shall be accomplished without damage to installed material or without deviation to finished grade. The ECB shall be pinned down in the manner recommended by the product manufacturer.

3.7.2 Temporary Seeding

When directed during contract delays affecting the seeding operation, when a quick cover is required to prevent surface erosion, or when areas to be permanently seeded are to remain unseeded for at least 30 days the areas designated shall be seeded in accordance with temporary seed species listed under paragraph 2.1.2 Temporary Seed Grass Species.

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L-611-614

L-594

L-575

L-550

UPON COMPLETION OF WORK OR AS DIRECTED BY THE COR.

OR CONTRACTOR ACCESS SHALL BE REPARED BY THE CONTRACTOR

ACCESS AND HAUL ROUTES DUE TO CONSTRUCTION ACTIVITIES

3. DAMAGES TO THE LEVEE EMBANKMENT, CREST ROAD, OR OTHER

CREST HAS NOT BE DEGREDED.

IN AREAS TO BE USED AS HAUL ROADS TO ENSURE THAT THE LEVEE

POST-CONTRUCTION SURVEYS OF THE LEVEE CREST ARE REQUIRED

AVAILABLE AND I AHS BEEN APPROVED BY THE COR. PRE- AND

AS A HAUL ROAD EXCEPT IN AREAS WHERE NO OTHER OPTION IS

2. THE CONTRACTOR SHALL NOT USE THE LEVEE CREST ROAD

LEVEE SYSTEMSPECIFIC KMZ FILES.

1. SPECIFIC SEEDING AND ECB LOCATIONS ARE PROVIDED ON THE

NOTES: