HomeMy WebLinkAbout329205 - Native Grass HydroseedingSECTION 329205 NATIVE GRASS HYDROSEEDING
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SECTION 329205 - NATIVE GRASS HYDROSEEDING
PART 1 - GENERAL
1.1 DESCRIPTION
A. Work in this section consists of furnishing all plant, labor, equipment, and performing
all operations to finish grade topsoil, to prepare seedbeds, seed native grass by hydraulic
application methods, and maintenance and protection of all hydroseeded areas.
B. All exterior native lawn areas within the seeding limits, except surfaces occupied by
buildings, plant beds, turfgrass, paving, except areas indicated to be undisturbed, shall
be seeded as shown on the drawings.
1.2 RELATED WORK DESCRIBED ELSEWHERE:
A. Sod Lawns - Section 329204
1.3 QUALITY ASSURANCE:
A. Qualification of Workmen:
1. Provide at least one person who shall be present at all times during execution of
this portion of the work and who shall be thoroughly familiar with the type of
materials being installed and the best methods for their installation and who shall
direct all work performed under this section.
1.4 PRODUCT HANDLING
A. Protection
1. All seed shall be delivered to the job site in the original bags with tags certifying
purity, germination, common and botanical name for each species, and percent
weed seed. All tags shall be removed from the bags ONLY by the Owner's
Representative. Untagged seed bags shall be rejected.
2. All hydromulch, tackifier and fertilizer shall be delivered to the job site in the
original unopened packaging.
B. Storage
1. Seed, hydromulch, tackifier and fertilizer shall be kept in dry storage away from
contaminants.
C. Replacements
1. In the event of rejection of the seed immediately make all replacements necessary
to the approval of the Owner's Representative and at no additional cost to the
Owner.
D. Notice to Proceed
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1. The Contractor shall not proceed with seeding until the seedbed has been
approved by the Owner's Representative.
E. Schedules
1. Install seed mixes during the specified time periods. If special conditions exist that
may warrant a variance in the specified plant dates or conditions, a written request
shall be submitted to the Owner's Representative stating the special conditions
and proposed variance.
F. Substitutions
1. All requests for substitutions shall be submitted in writing to the Owner's
Representative stating the special conditions and proposed variance. Substitution
requests must show that the proposed substitute materials and/or methods are in
every way equal to or better than the originally specified materials and/or
methods.
2. Decision of the Owner’s representative regarding acceptability of proposed
substitutions shall be final.
1.5 SUBMITTALS
A. Certification: Provide product data on the following materials:
1. Seed mixes
2. Fertilizer: Mix design based on specifications.
3. Mulch and tackifier
PART 2 - MATERIALS
2.1 SEED:
A. General
1. All grass seed shall be:
a. Free from noxious weed seeds, and recleaned;
b. Grade A recent crop seed;
c. Treated with appropriate fungicide;
d. Delivered to the site in sealed containers with dealer's guaranteed analysis.
B. Wetland Grass Mixture:
COMMON NAME PLS LBS./ACRE
1. VNS Tufted Hairgrass 0.40
2. Rosana Western Wheatgrass 2.00
3. Copperhead Slender Wheatgrass 5.00
4. VNS Beaked Sedge 1.20
a. Seeding Rate: 8.6 PLS LBS/ACRE
b. Seed mix supplied by Circle S Seeds 406-285-3269.
C. Native Grass Mixture:
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COMMON NAME % OF MIX
1. Slender Wheatgrass 25%
2. Western Wheatgrass 10%
3. Thickspike Wheatgrass 10%
4. Mountain Brome 13%
5. Sandberg’s/Big Bluegrass 15%
6. Bluebunch/Snake River Wheatgrass 23%
7. Blue Flax 2%
8. Prairie Coneflower 2%
a. Seeding Rate: 16 – 20 LBS/ACRE
b. Seed mix supplied by Circle S Seeds 406-285-3269.
D. Cover Crop: For use with both Wetland and Native grass mixtures.
1. Quick Guard (Sterile Triticale Hybrid)
2. Seeding rate: 30 LBS/ACRE
2.2 FERTILIZER
A. General
1. Fertilizer shall be commercially prepared.
2. Commercial fertilizer shall be complete, uniform in composition, dry and free-
flowing. The fertilizer shall be delivered to the site in the original waterproof
containers, each bearing the manufacturer's statement of analysis.
B. Special Protection
1. If stored at the site, protect fertilizer from the elements at all times.
C. MULCH AND TACKIFIER
1. All mulch and tackifier for hydroseeding shall be Mat-Fiber Plus as manufactured
by Mat, Inc. 888-477-3028
2.3 WATER
A. General
1. Water shall be available from the Water Distribution System. Contractor shall
make all arrangements for temporary metering, use, and payment for water with
the effected utility.
2.4 TOPSOIL
A. Refer to Sod Lawns - Section 329204 2.5 TOPSOIL for topsoil requirements.
PART 3 - EXECUTION
3.1 SURFACE CONDITIONS:
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A. Inspection
1. Prior to all work of this section, carefully inspect the installed work of all other
trades and verify that all such work is complete to the point where this installation
may properly commence.
2. Verify that seeding may be completed in accordance with the original design and
the referenced standards.
B. Discrepancies
1. In the event of discrepancy, immediately notify the Owner's Representative.
2. Do not proceed with installation in areas of discrepancy until all such
discrepancies have been fully resolved.
3. Beginning of installation means acceptance of existing conditions by installer.
3.2 TOPSOIL PLACEMENT
A. Compaction Prevention
1. The Use of heavy equipment will not be permitted on the site when soil
conditions are wet to prevent compaction of topsoil and subsoil. In the event of
wet weather, the Owner's Representative shall determine whether or not the use
of heavy equipment will be permitted. Decision of the Owner's Representative
shall be final.
B. Spreading Topsoil
1. Spread topsoil to a uniform compacted depth of six inches minimum. Topsoil
and subgrade shall be in a dry condition before spreading. Topsoil shall be free
flowing. Grading tolerance shall be plus or minus 0.1 foot for all spread topsoil.
Do not excessively work topsoil. Compaction shall be 80 to 85%, which can be
achieved through placing and leveling operations without rolling.
3.3 FERTILIZER AND AMENDMENT INCORPORATON
A. Apply fertilizer and other amendments as recommended by the topsoil test results.
B. Incorporate fertilizer and other amendments into the top 3 to 4 inches of prepared
seedbed.
3.4 GRADING
A. Finish Grading
1. Grade lawn areas to finish grades, filling as needed or removing surplus dirt and
floating areas to a smooth uniform grade. All lawn areas shall slope to drain.
Where no grades are shown, surfaces shall have a smooth and continual grade
between existing or fixed controls (such as walks, curbs, catch basins, elevations
at steps or building).
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2. Roll, scarify, rake and level as necessary to obtain true even lawn surfaces. Prior
to sodding, finish grade of compacted topsoil shall be 1” below all paved
surfaces.
3. All finish grades shall meet approval of the Owner's Representative before sod is
laid.
B. Fine Grading
1. Upon completion of finish grading, perform all fine grading required in planting
areas, using topsoil obtained from the site.
3.5 SOWING GRASS
A. Preparation
1. Seed bed preparation shall pertain to the preparation of the surface of the ground
to receive the seed. Seedbed preparation shall not commence until the moisture
conditions make the ground area and soil friable.
2. The ground shall be hand or machine raked so as to remove all debris, clods, rocks,
and other material larger than 1 inch from the surface. Such debris, clods, rocks,
and other material so removed shall be disposed of off the immediate property in
a legal manner.
3. If there has been a time lapse following the placement of the topsoil to allow it to
become settled and compacted on the surface, the area to be seeded shall be
thoroughly worked to a depth of 2 inches so as to provide a surface of such
condition that it will allow application of the seed in compliance with these
Specifications.
4. Seed beds should be permitted to settle or should be firmed by rolling before
seedings are made.
5. Thoroughly moisten the seedbed to promote germination of any seeds contained
in the topsoil.
6. After weeds have germinated and are growing vigorously, spray with Roundup
in strict conformance with manufacturers specifications. Seeding shall be
executed 7 days following Roundup application. Do not disturb the sterilized
seedbed in any way prior to seeding.
B. Sowing
1. Immediately prior to the application of the seed, the soil shall be loose to a depth
of at least 1 inch and free from all undesirable material as specified. If soil is too
loose or dry for good handling, it should be moistened and rolled lightly.
2. Non-irrigated areas shall be seeded between March 1 and April 15 or between
October 1 and October 31.
3. Seed shall be sown exercising great care that a uniform distribution of seed is
obtained. Seeding shall be done on a still day using a hydroseeder.
4. All native seed shall be placed by hydraulic methods.
5. Seed and mulch shall be applied in separate and distinct operations except that a
minimal amount of mulch may be added to the seed slurry as a visual aid during
the seeding process. Mulch applied with seed shall not exceed one-pound mulch
for each five (5) gallons water. This mulch shall be deducted from the total
quantity to be applied.
6. The application of the seed slurry shall be made with the equipment having a built-
in agitation system and operating capacity sufficient to agitate, suspend and
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homogeneously mix a slurry containing water, seed, and mulch. The slurry shall
be sprayed over the soil in a uniform coat. Wherever practical, the slurry shall be
applied normal to the surface being treated to effectively drill the seed into the
seedbed.
7. Hydromulch application shall follow seeding as soon as practical, with
consideration for minimal soil erosion through washing. All seeded areas shall be
mulched before work is terminated on any day.
C. MULCHING
1. Mulch all hydroseeded areas.
2. Topsoil or seed that washes out for reasons attributable to the Contractor's
activities or failure to take proper precautions, shall be replaced at the Contractor's
expense.
3. All structures shall be protected from hydraulic application of mulch material.
Any material deposited on walks, streets, inlets, or other structures shall be
removed by the Contractor, to the satisfaction of the Owners' Representative, at
no cost to the Owner.
4. Mulch shall not be applied in the presence of free surface water, but may be
applied on damp ground.
5. Mulch shall be mixed with water at a rate of one pound mulch (dry weight) to two
gallons of machine water capacity.
6. Mulch shall be applied uniformly as per manufacturer's recommendations at a
minimum rate of 2,000 pounds per acre.
D. TACKIFIER
1. Mulch tackifier shall be premixed with mulch at a rate of 3% by weight.
E. PROTECTION
1. Protect all seeded areas by erecting temporary fences, barriers, signs, etc. as
necessary to prevent all traffic. Barriers shall remain in place for at least six (6)
weeks unless other arrangements are made with the Owner's Representative.
3.6 MAINTENANCE
A. General
1. Maintain all native grass areas until final completion of the job but in no case less
than 6 weeks.
B. Work Included
1. Maintain protection to preclude any traffic across seeded area. Should any
damage occur repair as directed by the Owners' Representative at no cost to the
Owner.
2. Remove protection at the end of the maintenance period.
C. Replacements
1. Any area that fails to produce an adequate stand of grass within two growing
seasons shall be reseeded by the Contractor at no additional expense to the Owner.
Stand adequacy shall be judged by the Owners' Representative, and his opinion
shall be final.
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2. Replacements required because of vandalism or other causes beyond the control
of the Contractor are not part of the Contract.
D. Extension of Maintenance Period
1. Continue the maintenance period at no additional cost to the Owner until all
previously noted deficiencies have been corrected, at which time the final
inspection shall be made.
END OF SECTION 329205