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<br />1. 8"x8"x24" wood blocks and <br />S"x8"x48" wood blocks to ` <br />be used in construction. '! <br />2. MSHA accepted sealant to <br />be applied to both sides ' <br />of seals. Sealants will be <br />applied at least 1/8" thick. <br />3. Seals shall be hitched into <br />the Yibs at least one (1) foo '! <br />on either..side. <br />4. One seal, at the lowest ele- <br />vation, of .each set of seals <br />shall be installed with one i <br />water drainage pipe._ This ;' <br />drainage pipe shall be: <br />a. 4" in diameter ' <br />b. Of corrosion resistant <br />material equal to <br />schedule 90 steel pipe. <br />c. Equipped with a U-tube <br />water trap. i <br />d. Capped or sealed with a t <br />valve at the pipe's out- Y <br />let. j <br />5. One seal, at the highest ele- 1 <br />vation, of each set of seals <br />shall be installed with one ~ <br />surveillance tube. This <br />surveillance tube shall be: <br />a. ;" in diameter if copper f <br />or '~" in diameter if :i <br />' schedule 90 pipe or <br />equivalent. ~ <br />b. Sealed at an accessible ~~ <br />outlet with a valve, !~ <br />c. Able to withstand at ~ <br />least 75 PSIG. <br />TYPICAL WOOD SEAL <br />