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P 02 • • 628.1 Wood fiber, wood chips or similar material shall be applied with approved blowing ' machines or other approved methods which will place a controlled amount of mulch uniformly over the area to a depth of 1/2 to 1-I/2 inches.Areas to be mulched with wood '1 chips shall be treated with one pound of available nitrogen per 1000 square feet of area either prior to or after application of the chips. Throughout the process,the mulch material shall be fed into the blowing machine to produce a constant and uniform ejection from the discharge spout,operated in a position 4 to produce a mulch of uniform depth and coverage. i 627.3.2.3 Method C.The straw or hay mulch shall be uniformly spread over the desig- nated areas to a loose depth of 1/2 to 1-1/2 inches,using 1-1/2 to 3 tons of mulch per acre, by blowing from a machine,as described in Method B, or by other approved methods. Immediately after spreading, the mulch shall be anchored in the soil by the use of a mulch tiller consisting of a series of dull,flat discs with notched edges. The discs shall be approximately 20 inches in diameter and shall be spaced at about eight-inch centers.The • i ' tiller shall be equipped with a ballast compartment to permit adjustment of the weight for j, depth control The mulch shall be impressed in the soil to a depth of approximately 1-1/2 to 2-1/2 ! inches in one pass of the tiller traveling longitudinally.Mulch tillers shall not be operated i + `! `„ on slopes so steep that damage to the mulch,seedbed or soil occurs.The mulch on such areas shall be anchored by either Method A or Method B.Tractors shall be equipped and operated to minimize the disturbance or displacement of the soil. More than one pass of the tiller may be required to assure adequate anchoring of the mulch. i 627.4 Method of Measurement.The item of Mulching will be measured by the square yard or by the ton as provided in the contract. When measured by the square yard,the quantity to be measured for payment shall be the number of square yards of surface area on which the mulch has been placed and I accepted in accordance with the contract, r When measured by the ton, the quantity to be measured for payment shall be the : Ili number of tons of mulch furnished,placed and accepted in accordance with the contract. Asphaltic material, or other approved mulch binders or nitrogen used for treating �� mulch will not be measured for payment but will be considered as subsidiary to and i. included as a part of the item. • 627.5 Basis of Payment.The quantity,measured as provided above,will be paid for at iI the contract unit price per square yard or per ton for Mulching,which price shall be full iI i ' compensation for furnishing all materials,including asphaltic material or other approved ;i mulch binders or nitrogen;for all hauling,treating,placing,spreading and anchoring of 4 the mulch material;for maintenance of the work and repair of any damaged areas;and for furnishing all labor,tools,equipment and incidentals necessary to complete the work. P SECTION 628. EROSION CONTROL 82$.1 Description. This work shall consist of the furnishing and installation or con- struction of erosion control mats, fences,screens blankets and bale checks or dikes and 1I', other erosion control devices in accordance with the design and details indicated on the ;!j Plans and approved in the contract. Erosion Mat shall consist of furnishing and placing a layer of open weave jute fabric. 1 or wood fiber blanket or fiber glass roving and asphalt on seeded areas of the roadway to I' control erosion, at locations designated on the plans or directed by the engineer, il 465 . , ' J4