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BATTLE MOUNTAIN RESOURCES <br />San Luis Project <br />10.6 Mulching <br />Page 10-7 <br />Tee hnical Specifications <br />Materials for straw mulching as specified shall consist of straw of oats, barley, wheat or rye and <br />shall not contain seed of noxious weeds. Straw in such an advance stage of decomposition as to <br />smother or retard the normal growth of seed will not be accepted. Old dry straw which breaks in <br />the crimping process in lieu of bending will not be accepted. <br />After seeding has been completed, hay or straw shall be uniformly applied at a rate of two tons <br />per acre. The mulch shall then be crimped in with a mechanical crimper or other approved <br />equipment. The Designer may order the employment ofhand-crimping operations on such areas <br />where excessive ground slopes or confined areas would cause unsatisfactory crimping to result <br />by mechanical methods. <br />The seeded area shall be mulched and crimped within 24 hours after seeding. Areas not mulched <br />and crimped within 24 hours after seeding must be re-seeded with the specified seed mix at the <br />Contractor's expense prior to mulching and crimping. <br />On slopes steeper than 2:1 or other specific areas which are difficult to mulch and crimp by <br />conventional methods, hydraulic mulching or other means may be used when approved by the <br />Designer. If adopted by the Contractor, hydraulic mulch shall consist of wood cellulose fiber <br />mulch. <br />Wood cellulose fiber for hydraulic mulching shall not contain any substance or factor which <br />might inhibit germination or growth of seed. I[ shall be dyed an appropriate color t~J allow visual <br />metering of its application. The wood cellulose fibers shall have the property of becoming <br />evenly dispersed and suspended when agitated in water. When sprayed uniformly .m the surface <br />of the soil, the fibers shall form ablotter-like ground cover which readily absorbs water, and <br />allows infiltration to the underlying soil. Weight specifications from supplier:;, and for all <br />applications, shall refer only to air dry weight of the fiber, a standard equivalent to 10 percent <br />moisture. The mulch material, accompanied with a manufacturer's certification, shall be marked <br />by the manufacturer to show the air dry weight content. Suppliers shall certify that laboratory <br />and field testing of their product has been accomplished, and that i[ meets all of the foregoing <br />requirements pertaining to wood cellulose fiber mulch. <br />N:\DHALLMAN\SANLUIS\SANLUIS.DOC 10-7 SRK Profect No. 14772 <br />