METHOD OF MEASUREMENT 906-4.1 The area of topsoil planting to be paid for shall be the number of acres and tenths thereof, measured by surface area, topsoil planted and accepted. 906-4.2 The area of liming to be paid for shall be the number of acres and tenths thereof, measured by surface area, limed and accepted. 906-4.3 The area of fertilizing to be paid for shall be the number of acres and tenths thereof, measured by surface area, fertilized and accepted. 906-4.4 The units of watering to be paid for shall be the number of 1,000-gallon units of water measured by an approved meter, or in the vehicle at the point of delivery, and used as specified or ordered. 906-4.5 The area of mowing to be paid for shall be the number of acres for each separate mowing operation, measured by the surface area, mowed and accepted. 906-4.6 The area of refertilizing to be paid for shall be the number of acres for each separate refertilizing operation, measured by the surface area, refertilized, and accepted. 906-4.7 The quantity of soil for repair work to be paid for shall be the number of cubic yards of soil, measured in the vehicle at the point of delivery, completed in place, and accepted. BASIS OF PAYMENT 906-5.1 The acreage of topsoil planting, determined as provided above, shall be paid for at the contract unit price per acre for "Topsoil Planting," which price and payment shall constitute full compensation for preparing the ground surface, furnishing (unless available on the site) and obtaining topsoil with grass, placing and spreading topsoil with grass, cleaning up, compacting, finished grading, protection; and for all labor, tools, and incidentals necessary to complete the work. 906-5.2 The acreage of liming, determined as provided above, shall be paid for at the contract unit price per acre for "Liming," which price and payment shall constitute full compensation for furnishing and applying lime; and for all labor, equipment, tools, and incidentals necessary to complete the work. 906-5.3 The acreage of fertilizing, determined as provided above, shall be paid for at the contract unit price per acre for "Fertilizing," which price and payment shall constitute full compensation for furnishing and applying fertilizer; and for all labor, equipment, tools, and incidentals necessary to complete the work. 906-5.4 The units of watering, determined as provided above, shall be paid for at the contract unit price per 1,000-gallon unit for "Watering," which price and payment shall be full compensation for furnishing, hauling, and distributing water; and for all labor, equipment, tools, and incidentals necessary to complete the work. 906-5.5 The acreage of mowing, determined as provided above, shall be paid for at the contract unit price per acre for each "Mowing," which price and payment shall constitute full compensation for all mowing and for any required raking and removing of excessive growth; and for all labor, equipment, tools, and incidentals necessary to complete the work. 906-5.6 The acreage for refertilizing, determined as provided above, shall be paid for at the contract unit price per acre for "Refertilizing," which price and payment shall constitute full compensation for furnishing and applying fertilizer; and for all labor, equipment, tools, and incidentals necessary to complete the work. 906-5.7 The yardage of soil, determined as provided above, shall be paid for at the contract unit price per cubic yard for “Repairing,” which price and payment shall constitute full compensation for furnishing, hauling, placing, spreading, and compacting soil; and for all labor, equipment, tools, and incidentals necessary to complete the work. Payment will be made under: Item T-906-5.1 Topsoil Planting-per acre. Item T-906-5.2 Liming-per acre. Item T-906-5.3 Fertilizing-per acre. Item T-906-5.4 Watering-per 1,000-gallon unit. Item T-906-5.5 Mowing-per acre. Item T-906-5.6 Refertilizing-per acre. Item T-906-5.7 Repairing-per cubic yard. 907-1.1 This item shall consist of preparing the surface of areas for dust control or erosion control, in accordance with this specification at the locations shown on the plans, or as directed by the engineer. CONSTRUCTION METHODS 907-3.1 GENERAL. Areas to be tilled and areas requiring special attention and tilling will be shown on the plans. The tilling work shall be performed only during periods when beneficial and satisfactory results can be reasonably expected. The work shall be stopped when it is unlikely that the desired results will be obtained, due to excessive drought, moisture conditions, or other factors, and resumed only when the conditions again are favorable. Suitable equipment necessary for proper tilling and for handling all required materials shall be on hand, in good operating condition, and shall be approved by the engineer before the various operations are started. 907-3.2 TILLING. (a) General. Prior to the commencement of tilling operations, all heavy growths of vegetation on areas shown on the plans to be tilled shall be mowed, raked and burned, used for mulch if suitable, or hauled off the site, as directed by the engineer. During tilling operations, the ground surface shall be kept cleared of all cable, wire, or any other waste materials which might hinder final grading, planting, or subsequent maintenance operations. Any irregularities in the surface, resulting from tilling or other operations of the contractor, shall be corrected insofar as practical to prevent the formation of low places and pockets where water will stand. The properly graded areas shall be tilled by the contractor with suitable plows, disks, scarifying machines, or other power-drawn implements approved by the engineer. (b) For Dust and Erosion Control. The areas to be tilled for dust or erosion control shall be loosened to a depth of at least four (4) inches by a tiller tool in such a manner that clods will be left on the surface of the ground. In areas where such penetration cannot be accomplished by a tiller tool in one operation, a heavy scarifier shall be used first. On areas 250 feet or more from the centerline of runways, as shown on the plans, on which scarifiers will not produce clods of sufficient size and quantity to provide adequate control by the above operation, furrows shall be opened on approximately 36-inch centers to a depth of five (5) inches by using an approved type lister. Tilling operations shall commence on the windward side of the field and at right angles to the prevailïng wind except on runway shoulders, where they shall be parallel to the pavements. Equipment and operations, other than those specified above, may be used subject to the approval of the engineer. 907-3.3 SMOOTH GRADING. Where final grades have been established by others, they shall be shown on the plans. Where grades have not been established, the areas shall be smooth graded and the surfaces left at the prescribed grades in an even and properly compacted condition which, insofar as practical, will prevent the formation of low places and pockets where water will stand. METHOD OF MEASUREMENT 907-4.1 The area of tilling to be paid for shall be the number of acres, measured by surface area, tilled, smooth graded, and accepted. BASIS OF PAYMENT 907-5.1 The acreage of tilling, determined as provided above, shall be paid for at the contract unit price per acre for "Tilling," which price and payment shall constitute full compensation for any necessary removing of vegetation, tilling, smooth grading, cleaning up; and for all labor, equipment, tools, and incidentals necessary to complete the work. Payment will be made under: Item T-907-5.1 Tilling-per acre. ITEM T-908 MULCHING DESCRIPTION 908-1.1 This item shall consist of preparing the ground surface, furnishing and placing mulch, or remulching on the prepared areas in accordance with this specification at the locations shown on the plans, or as directed by the engineer. MATERIALS 908-2.1 MULCH MATERIAL. Acceptable mulch shall be the materials listed below, or any approved locally available material that is similar to those specified. Low grade, musty, spoiled, partially rotted hay, straw, or other materials unfit for animal consumption will be acceptable. Mulch materials, which contain matured seed of species which would volunteer and be detrimental to proposed overseeding, or to surrounding farm land, will not be acceptable. Straw or other mulch material which is fresh and excessively brittle, or which is in such an advanced stage of decomposition as to smother or retard the planted grass, will not be acceptable. (a) Hay. Hay shall be native hay, Sudan grass hay, broomsedge hay, legume hay, or similar hay or grass clippings. (b) Straw. Straw shall be the threshed plant residue of oats, wheat, barley, rye, or rice from which grain has been removed. (c) Stalks. Stalks shall be the whole or shredded stems of corn, cane, kafir, sorghum, broom corn, hemp, flax, sunflowers, castor beans, potato vines, tobacco, and other coarse stemmy material. (d) Manure. Manure shall be fresh or partially decomposed strawy stable manure containing not over twenty-five (25) percent of solid material by volume. (e) Forest Litter. Forest litter shall be the surface layer of leaves, twigs, needles, and small branches from local woods. Forest litter shall be removed in such a way as to avoid injury to the trees. (f) Hay Mulch Containing Seed. Hay mulch shall be mature hay containing viable seed of native grasses or other desirable species stated in the special provisions or as approved by the engineer. The hay shall be cut and handled in such a way as to preserve the maximum quantity of viable seed. Hay mulch which cannot be hauled and spread immediately after cutting shall be placed in weather-resistant stacks or baled and stored in a dry location until used. 908-2.2 INSPECTION. Within five (5) days after acceptance of the bid, the engineer shall be notified of sources and quantities of 457 763591°-48 -30 |