207Topsoil

Topsoil

Description

207.01. This work consists of salvaging and stockpiling topsoil, and excavating suitable topsoil

from stockpiles, contractor sources, available sources, or from the approved natural ground cover to place on designated areas. Placing of topsoil upon constructed cut and fill slopes after grading operations are completed is included.

Materials

207.02. Topsoil shall consist of loose friable soil from the zone of major root development free

of subsoil, refuse, stumps, woody roots, rocks, brush, noxious weed seed and reproductive plant parts from current state and county weed lists, heavy clay, hard clods, toxic substances, or other material that would be detrimental to its use on the project. Wetland topsoil material shall consist of the moist, organic soil, including any existing wetland vegetation and seeds, to be excavated from areas as shown on the plans or as directed.

Construction Requirements

207.03. Wetland topsoil material shall be excavated from the designated area to a maximum

depth of 12 inches, or as otherwise designated, and placed within 24 hours in the specified area. The Contractor shall prepare the relocation site to elevations specified and approved by the Engineer before excavating the wetlands. If the Engineer determines that this is not possible, then the Contractor shall stockpile the material in an approved area, to remain undisturbed until the relocation site has been prepared. Storage time within the stockpile shall be as short as possible. Wetland topsoil material shall be placed over the prepared relocation areas to a depth of 12 inches, or as otherwise designated. Topsoil within the limits of the roadway shall be salvaged before beginning hauling, excavating, or fill operations by excavating and stockpiling the material at designated locations in a manner that will facilitate measurement, minimize sediment damage, and not obstruct natural drainage. Topsoil shall be placed directly upon completed cut and fill slopes whenever conditions and the progress of construction will permit.

Topsoil shall be placed at locations and to the thickness provided in the Contract and shall be keyed and tracked to the underlying material without creating a compacted surface by the use of harrows, bulldozers, rollers, or other equipment suitable for the purpose.

Salvaged topsoil exceeding the quantity required under the Contract shall be disposed of at locations acceptable to the Engineer.

207.04

Method of Measurement

207.04. Topsoil salvaged from the roadway and placed in stockpiles shall be measured in

the stockpile in cubic yards by the method of average end areas and paid for as Stockpile Topsoil. Topsoil salvaged from the roadway, taken from stockpiles or from approved pits, hauled and placed directly upon completed cut and fill slopes shall be measured at its source in cubic yards, as described in subsection 203.11, and paid for as Topsoil.

Topsoil generated from the roadway and placed in windrows will be measured at its source in cubic yards, as described in subsection 203.11, and paid for as Stockpile Topsoil. When it is subsequently placed upon the completed cut and fill slopes, the same quantity will be paid for as Topsoil, except that adjustment in quantity shall be made if the total windrowed quantity is not utilized.

Wetland topsoil material excavated from areas within the right of way and placed in stockpiles will be measured in the stockpile by the method of average end areas and paid for as Stockpile Wetland Topsoil.

Wetland topsoil material excavated from areas within the right of way or from stockpiles, hauled and placed directly on a relocated site will be measured at its source in cubic yards, as described in subsection 203.11, and paid for as Wetland Topsoil.

Topsoil secured from the Contractor's source will be measured in place by measuring random depths of topsoil and computing the volume by multiplying the area times the average depth.

Basis of Payment

207.05. The accepted quantities measured as provided above will be paid for at the

contract unit price per cubic yard for each of the pay items listed below that appear in the bid schedule. Payment will be made under:

Pay Item Pay Unit Stockpile Topsoil Cubic Yard Topsoil Cubic Yard Stockpile Wetland Topsoil Cubic Yard Wetland Topsoil Cubic Yard

208.02