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• <br /> <br />1. 16"x8"x8"cinder blocks or <br />Jack Kennedy panels to be <br />used in construction. <br />2. tdSHA accepted sealant to be <br />applied on both sides of <br />long lived overcasts or on <br />one side of short lived <br />overcasts. If a MSHA <br />approved construction sealan <br />is used, long lived overcast <br />need only :to be coated on <br />one side. All exposed, un- <br />treated wood shall be coated <br />with an acceptable fire <br />retardant sealant. Sealants <br />will be at least 1/8" thick. <br />3. Mandoors will be constructed <br />of steel. <br />4. A 1"x12" plank may be used <br />as a footer board if <br />necessary. <br />5. Location s. to be used: <br />a. Long lived areas <br />b. Short lived areas <br />6. Overcast usage: <br />a. Belt separation from the <br />intake escapeway <br />b. Intake air course <br />separation from the <br />return air course <br />c. Belt separation from <br />the return air course. <br />'~;• i i <br />TYPICAL OVERCAST ~ i.. °:t~~~>>- ~~.~. ; ~ ~ i~ : ~; ; ; . `~.~-; <br />~ 1. i Ii 1,~~~; ~~. v tt~J 1:~. <br />~. ;; <br />•'t~P..~... . .. ... <br /> <br />'I <br />i <br />F <br />f <br />:. f' <br />.. <br />~; <br />i <br />• ,.. <br />': <br />'~ ' ~. i. <br />.y t <br />:~: ~~~i <br />