Construction_Spec_6_Rev.pdf

Solicitation 12FPC119Q0034 Attachment 2

(210-VI-NEH, January 2014) 6–4

7. Items of work to be performed in conformance with this specification and the construction details therefore are:

1. Bid Item 002A: Permanent Seeding

a. This work item shall consist of all work and materials necessary to install all permanent and temporary seeding for the project except for the (2) grassed waterways.

a) Seeding of interior wetland areas shall utilize the natural seedbank and shall be accomplished through the replacement of topsoil. No additional seeding is required under this work item for these areas.

b) Permanent seeding must be done on all disturbed areas outside of the impoundment areas as per the directions below:

1. Prior to seeding the topsoil shall be amended with lime and fertilizer according to the soil tests or at the rates listed below. Amendments shall be incorporated into the soil at a depth of 4 to 6 inches.

a. Lime and Fertilizer

Lime 6 tons/acre

Fertilizer 10-10-20 1000 lbs/acre

2. After finish grading, permanent seeding shall be applied with a broadcast seeder or drilled. The following species and rates shall be followed and shall incorporate a nurse crop:

a. Nurse Crop (choose one)

Oats 48 lbs/acre

Annual Ryegrass 20 lbs/acre

Wheat 90 lbs/acre

b. Seed Mixture1

Species Lbs/acre – PLS* Perennial Ryegrass 30 Tall Fescue OR 35 Kentucky Bluegrass 20

1 Other seed mixtures are available, contact the local NRCS District Conservationist for guidance on selecting an alternative mixture.

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3. After seeding the site shall be mulched with 3/tons per acre of hay or straw and provide 70% ground cover.

*Seeding rates are stated as pounds per acres (lbs/acre) of pure live seed (PLS). PLS is the product of the percentage of pure seed times the percentage of germination divided by 100. (e.g.

[85% pure seed x 72% germination] ÷ 100 = 61% PLS). Seed should not be used later than one year after the test date that appears on the label. Use of seed older than one year could result in less than satisfactory vegetative coverage and the need to re-seed the disturbed areas.

c. Temporary seeding is required when the period of soil exposure without permanent seeding will be more than two months but less than 12 months. Details on temporary seeding is found within the E&S details of the construction drawings.

d. Payment for this work item will be lump sum upon completion of all permanent seeding and completion of all other work items except work item 001B.

2. Bid Item 002B: Forestry Practices (Brush Management and Forest Stand Improvement)

a. This work item shall consist of all work and materials necessary to complete 31 acres of brush management and 9.3 acres of forest stand improvement where shown on the Forestry Practice Detail Map.

b. Brush management shall consist of eliminating noxious weeds and invasive species from the 31 acres. Particularly, all multiflora rose needs to be targeted and eliminated. This shall be accomplished using backpack sprayers and herbicide. The herbicide shall be approved by the NRCS representative prior to use.

c. Noxious weeds shall eliminated from the planting area using herbicide, any noxious weed listed on the Pennsylvania Noxious Weed Control List shall be eliminated.

d. Forest Stand Improvement shall consist of controlling the American Beech trees on 9.3 acres as shown on the map. American beech trees shall be controlled using basal stem spray. Herbicides used shall be approved by the NRCS representative prior to use.

Manufactures instructions shall be followed for application of herbicide.

e. Herbicide shall be sprayed from the base of the tree up 18” around the entire diameter of tree.

f. This work item shall be completed within 30-days from the official start date as described in the notice-to-proceed letter.

g. Success of herbicide application shall be a minimum of 80% and shall be field verified by NRCS 30-days after application.

h. Payment for this work item will be lump sum upon completion upon of this work item.

3. Subsidiary Item: Permanent Seeding – Grassed Waterways

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a. This item shall consist of all work and materials necessary to install permanent seeding and erosion control blankets for the (2) grassed waterways as shown in the construction drawings.

b. Permanent seeding shall be installed as per work item 001A of this specification. Seeding shall be applied prior to the installation of the erosion control blankets.

c. Erosion control blankets on each grassed waterway shall be 8ft in width for the entire length of the waterway. The erosion control blankets shall be equal to a North American Green Eronet DS150 or a East Coast Erosion Control ECS-2B blanket.

d. Installation of the blankets shall follow the manufactures instructions.

e. No separate payment will be made for this work item, compensation will be included in payment for Bid Item 008, Diversion and Waterway.