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! 627-2 3 nature which is substantially free of noxious weed seeds and objectionable foreign matter. • , Asphaltic material,if used,shall be an emulsified asphalt meeting the requirements for I Type SS-1 of the Specification for Emulsified Asphalt, AASIHTO Designation: M 140. Materials used in lieu of asphaltic materials for binding mulch shall be approved by t k the engineer prior to their use. 627.3 Construction Methods. 27,3.1 General.Unless otherwise directed,the mulch shall be placed on a given area within three days after the seeding has been completed. Mulching operations shall not be performed during periods of excessively high winds which would preclude the proper placing of the mulch. The placed mulch shall be loose or open enough to allow some sunlight to penetrate • and air to slowly circulate,but thick enough to shade the ground,conserve soil moisture and prevent or reduce erosion. The contractor shall maintain the mulched areas and shall repair any areas damaged by wind,erosion,traffic, fire or other causes prior to final or partial acceptance of work under the contiact. ,` t 627.3.2 Placing. The contractor may elect to perform the work in accordance with i either Method A, Method B, or Method C,or a combination thereof, unless a specific,; y method is specified in the contract, 627.3.2.1 Method A,The mulching material shall be uniformly spread over the desig l nated areas to a loose depth of 1/2 to 1-1/2 inches. The specific rate of application,de-! • ! pending on the character of the material,shall be such that the resulting cover conforms . to the requirements specified under Subsection 627.3.1.The mulch material from corn-., pactcd bales shall be well loosened or made fluffy before being spread in place. Unless}. otherwise directed,mulching operations shall begin at the top of the slopes and proceed.. downward.•I;; j Straw or hay mulch shall be securely anchored by the use of an approved netting securely pegged or stapled in place.In lieu of such anchorage,the mulch may be secured 1 by means of heavy biogradable twine fastened by pegs or staples to form a grid of from' six to ten feet spacing. Approved erosion control blankets or mats may be used in lieu of separate applica tions of mulch and netting. ! 627.3.2.2 Method B. • Straw or hay shall be treated with asphaltic material blown fro .v a machine and uniformly deposited over designated areas in one operation, k Straw or hay mulch shall be placed uniformly over the area to a depth of 112 to I in;.0i, using 1-1/2 to 3 tons of mulch per acre and 75 to 100 gallons of emulsified asphalt per tot of straw or hay. Within the above-designated limits, the engineer will determine,on t ;a '' job,the rate of application of the mulch and the asphalt,and the engineer may vary t' i rates during mulching operations to produce the desired results. The machine for placing the mulch shall be of an approved type which will blow .'• eject by constant air stream a controlled amount of mulch and which will introduce 41.• ' the air stream a spray of asphalt to partially coat the straw or hay, producing a spot±• tack sufficient to hold together and retain in place the deposited straw or hay. r 3 `! Approved mulch binding materials may be used in lieu of asphaltic material for t ' ing the mulch material- Such materials shall be applied simultaneously with the rn.," when approved by the engineer or as an overspray.The binding materials shall be ml '1 and applied with suitable equipment in accordance with the manufacturer's instructs'±; I! lll except that the engineer may vary the rate of application to achieve the desired rag,�I' 464