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outby the faces of developing entries. Whenever the <br />_ third connecting crosscut is broken through, work <br />• shall be started on building the third outby stop- <br />ping as soon as possible and shall continue in a <br /> reasonable and diligent manner until completed. <br /> Similarly, whenever a belt line is advanced, tempo- <br /> rary stoppings (brattice), shall be installed immed- <br /> iately and work shall be started on building the <br /> permanent stoppings as soon as possible and shall be <br /> continued in a reasonable and diligent manner until <br /> completed. <br />c. Permanent stoppings between intake and return air' <br /> courses shall be erected and maintained to'within <br /> 600' of the working face of developing rooms. This. <br /> distance shall be measured between the working face. <br /> and the centerline of the first "open" outby cross- <br /> cut between the intake and return air courses. <br />d. permanent stoppings separating intake, return and' <br /> belt entries may be removed temporarily for special <br /> construction or repair projects such as; belt or <br /> belt drive repair or replacement, undercast or over- <br /> cast construction, back entry maintenance, etc. <br /> Temporary stoppings (brattice) shall be installed <br /> immediately and maintained until the project is - <br /> completed. <br /> Permanent stoppings shall be reconstructed immedi- <br /> ately after the project is completed. <br /> <br />• 2a. Typical drawings Eor each type of ventilation con- .`:~i~ j#*~; <br /> trol devices used in the mine are shown on Pages 8 ', :'~;:~, <br /> through 13. ,....` <br />~''~ ~ <br />b. On Pa a 14 is a list- of MSHA acre ted or a <br /> sealants. ;`.;; :; <br />c. On Pages 17 and 18 are typical drawings for each <br /> type of permanent seal. <br />• <br />h.i ~~ ~• 3 <br />