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(c) Broken cartridges of resin or cartridges that show signs of deter- <br />(~ ioration shall be removed from the underground portion of the mine. <br />`~ (d) Resin grouted rods shall be installed in accordance with the manu- <br />facturer's recommendations. <br />9. For test purposes the first resin grouted rod installed in each cycle <br />in each working place, after a minimum curing time of 10 minutes, shall <br />be checked with a torque wrench after installing the first line of perm- <br />anent support and prior to removing any temporary supports. The torque <br />applied should be 150 foot-pounds. Should the rod turn in the hole, a <br />second rod shall be tested in the same manner. If this rod also turns, <br />resin installation shall be discontinued until reasons for failure of <br />the resin is determined. (A click type torque wrench is recorriended <br />for this test.} <br />SAFETY PRECAUT]ONS--SPECIAL ROOF COt~7ROL PLAN <br />Because the number of mines having a special roof control plan is <br />minimal and the latitude of variation in requirements peculiar to <br />special roof control plans is so great, it is believed that safety <br />• precautions to be included in such plans shall be formulated on a <br />mine-to-mine basis. <br />• <br />19 <br />