B01 Attachment 7 Topsoiling Seeding Fertilizing Mulching.pdf

Pamunkey Indian Tribe Construction of Sanitation Facilities February 2022 Topsoiling, Seeding, Fertilizing, and Mulching

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SECTION 02920

TOPSOILING, SEEDING, FERTILIZING, AND MULCHING

PART 1 - GENERAL

1.01 SUMMARY

A. This section includes topsoiling, seeding, fertilizing, and mulching areas disturbed by construction activities.

1.02 RELATED WORK (as applicable)

A. Section 02310 - Grading B. Section 02315 – Excavation, Trenching, and Backfill C. Section 02370 – Environmental Protection

1.03 REFERENCES

A. Commonwealth of Virginia, DEQ, Erosion and Sedimentation Control Regulations

1.04 SUBMITTALS

A. Topsoil

B. Seed Mixture and Application Rate Data

C. Mulching Material

PART 2 - PRODUCTS

2.01 TOPSOIL

A. Natural loam, sandy loam, silt loam, silty clay loam, or clay loam humus-bearing soils adapted to the sustenance of plant life.

B. Neither excessively acid nor excessively alkaline.

2.02 FERTILIZER

A. Use a 20-10-10 mixture of 20% Nitrogen, 10% Phosphorous, and 10% Potassium.

2.03 SEED MIXTURE

February 2022 Topsoiling, Seeding, Fertilizing, and Mulching

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A. Use Kentucky 31 or Turf-Type Tall Fescue or other Engineer accepted seed mixture.

2.04 MULCHING MATERIAL

A. Straw or hay

PART 3 - EXECUTION

3.01 TOPSOIL

A. After grading is completed, spread stockpiled topsoil over all disturbed areas, excluding those where another type of finished surface is being provided.

3.02 FERTILIZING

A. Work soil to be seeded until soil is reasonably even and loose.

B. Fertilize all topsoiled areas using 20-10-10 fertilizer at an application rate of 400-600 pounds per acre.

3.03 SEEDING

A. Sow seed using either equipment suited to that purpose or scatter seed uniformly over area with hand seeders when the weather is sufficiently quiet to prevent seeds from blowing away.

B. Sow seeds at 150% of the manufacturer recommended rate.

C. Lightly rake soil to cover the seed with approximately ¼ inch of soil.

3.04 MULCHING

A. Place hay or straw mulching on seeded area loose enough to allow some sunlight to penetrate and air to circulate but thick enough to shade the ground, conserve soil moisture, and prevent/reduce erosion.

B. Do not perform mulching activities during periods of excessively high winds, which would preclude the proper placing of the mulch.

C. Apply straw or hay uniformly over the disturbed area to a loose depth of ½ to 1½ inches using 1½ to 3 tons of mulch per acre.

D. Immediately after spreading, anchor mulch using a mulch tiller consisting of a series of dull flat discs with notched edges or other approved equipment.

February 2022 Topsoiling, Seeding, Fertilizing, and Mulching

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E. Anchor mulch to a depth of approximately 1½ to 2½ inches in the soil.

3.05 QUALITY CONTROL

A. All work necessary for topsoiling, fertilizing, seeding and mulching shall be completed to insure adequate re-establishment of vegetation.

B. The Contractor is responsible for re-establishing vegetation.

END OF SECTION

February 2022 Topsoiling, Seeding, Fertilizing, and Mulching

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