573 SECTION 651 FURNISHING AND PLACING TOPSOIL
651.1 -DESCRIPTION : This work shall consist of acquiring sites outside the right -of-way from which topsoil can be obtained and the hauling and placing of such material, or hauling and placing of tops oil from stockpiles within the right -of-way, all in accordance with these Specifications and at locations indicated on the Plans or designated by the Engineer.
651.2 -MATERIALS : Topsoil shall consist of the uppermost layers of fertile and friable soil that contains humus material. This material varies in thickness in accordance with soil groups and usually possesses a darker color than the subsoil. The texture of the topsoil may vary within the range o f natural loam, silty clay loam, and sandy loam. Acceptable topsoil shall contain organic matter in the range of 2% to 20% and be sampled at least once per project using AASHTO T 267 method; multiple sources or change of sources shall also be sampled.
CON STRUCTION METHODS
651.3 -STRIPPING TOPSOIL : Prior to removal from the site, the soil will be tested by the Division to determine the humus and nutrient value. Care shall be exercised as to th e depth of stripping, and any loads with an excess of subsoil shall be discarded. The Contractor shall mow or otherwise remove all heavy grass, weeds, or other vegetation over the areas before stripping. Approval by the Engineer must be obtained prior to transporting any material from the stripping site.
651.4 -TRANSPORTING : Topsoil material shall not be placed until the entire roadway (including surfacing) has been completed, unless otherwise provided for on the Plans or approved in writing. During hauling operations, the surface of the highway shall be kept reasonably clean to avoid creating a traffic hazard.
651.5 -PLACING AND MANIPULATING : Areas to be topsoiled shall be brought reasonably close to the lines and grades shown on the Plans or established by the Engineer. The Contractor shall scarify the surface of the subsoil before the topsoil is placed, unless otherwise permitted, for bonding the topsoil layer with the subsoil. Scarification shall be accomplished by disking, harrowing, raking, or other approved methods. Depressions and ridges formed by construction equipment, during final grading or scarifyin g, shall be parallel to the contours. Topsoil shall not be spread to a greater depth than that required to make the work conform to the natural terrain after shrinkage and settlement have taken place. After spreading the soil, all deleterious materials ( large lumps or clods, brush, litter, or other foreign material, and stones exceeding two ( 2) inches approximately in any dimension) shall be raked up and removed from the site. The Contractor shall take all reasonable precautions to avoid injury to existing plant growth, structures, and roadway surface.
574 651.6 -METHOD OF MEASUREMENT : The quantity of work done will be measured in cubic yards of "Furnishing and Placing Topsoil" or "Placing Stockpiled Topsoil", which shall be the material actually removed from previously selected sit e or sites outside the right -of-way of from stockpiles within the right -of- way, and acceptably placed and spread on the areas designated to receive it, as determined from the net total of load tickets of vehicles.
651.7 -BASIS OF PAYMENT : The quantities, determined as provided above, will be paid for at the contract unit prices bid for the items listed below, which prices and payments shall be full compensation for furnishing all the materials a nd doing all the work prescribed in a workmanlike and acceptable manner, including all labor, tools, equipment, supplies, and incidentals necessary to complete the work. No separate payment will be made for stripping topsoil within the right -of-way limits and transporting or stockpiling of such material.
651.8 -PAY ITEMS : ITEM DESCRIPTION UNIT 651001 -* Furnishing and Placing Topsoil Cubic Yard 651002 -* Placing Stockpiled Topsoil Cubic Yard
* Sequence number
575 SECTION 652 SEEDING AND MULCHING
652.1 -DESCRIPTION : This work shall cover all operations incidental to the establishment of grass and legume vegetation, including the furnishing and sowing of seed, furnishing and applying fertilizer, agricultural limestone, and mulch material, all in accordance with these Specifications and at locations indicated on the Plans or designated by the Engineer.
652.2-MATERIALS : Materials shall meet the requirements in the following Subsections of Division 700:
MATERIAL SUBSECTION Fertilizers 715.26 Ground Agricultural Limestone 715.25 Inoculating Bacteria 715.29 Matting for Erosion Control 715.24 Mulch Materials 715.27 Water *
* Water shall be reasonably free from injurious chemicals and other toxic substances harmful to plant life. The source of water used is subject to the approval of the Engineer.
Temporary seed, such as annual ryegrass (Italian ryegrass) and weeping lovegrass, used in the seed mixtures B, C, or D, shall be of a commercial grade meeting the requirements of the State Seed Law. Temporary seed labeled with the notation "germination below standard" shall not be used. Temporary seed shall not be used afte r one year from date of germination test shown on the label. Seed other than that specified above shall meet the requirements of subsection 715.28. Chemical mulch binders shall conform to the requirements in subsection 715.27.1. Topsoil, if called for, shall conform to the requirements in section 651. All materials will be subject to approval or rejection, in part or in whole.
CONSTRUCTION METHODS
652.3 -SEASON OF WORK : Permanen t seeding or second and third seeding following the original seeding, under
allow seeding equipment to operate; without regard to seasons.
652.4 -AREA PREPARATION FOR SEEDING AND MULCHING : Seeding and mulching shall not be applied until t he specified areas have been brought to lines and grades shown on the Plans. Topsoil, when called for, shall be spread to the depths indicated on the Plans. The application rate for agricultural limestone will be determined by a pH test after cuts and em bankments are completed just prior to seeding. The Plans will show the estimated tons of lime needed for the job based on general knowledge of the soils in the area. The final application