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THICKENER UNDERFLOW WELL DIAGRAM <br />10/29/2009 <br />NOT TO SCALE <br />STUFFING BOX WELL HEAD <br />DRILLING AND REAMING PHASE <br />SAMPLE TUBE WITH METHANE MONITOR <br />DISCHARGE AIR WITH SAMPLE TUBE <br />VALVE ON DISCHARGE AIRLINE <br />6.) <br /> <br /> n <br /> <br /> <br /> <br />? rv ? 4 <br /> <br /> i <br /> S <br />NOTE, <br />L) FIRST A NOMINAL 14 3/4' FIOLE IS DRILLED TO A <br />DEPTH OF APPROX. 80' FROM THE SURFACE FOR IN-PLACE <br />GROUTING OF A MAX. 14' DIAM. STEEL SURFACE CASING. <br />2.) THEN A NOMINAL 6 1/4' PILOT HOLE IS DRILLED TO <br />WITHIN 10' OF THE SURVEYED MINE ROOF. <br />3.) THE NOMINAL 6 1/4' PILOT HOLE WILL THEN BE REAMED <br />TO A NOMINAL 11' DIAMETER TO WITHIN 10' OF THE MINE ROOF. <br />4.) ALL DRILLING & REAMING WILL BE STOPPED -10' ABOVE THE <br />SURVEYED ENTRY. <br />NOMINAL 40 ' LONG BY 8' ID WELDED FLUSH JOINT CASING WILL BE INSTALLEI <br />AND GROUTED IN PLACE TO APPROXIMATELY 10' ABOVE THE SURVEYED ENTRY. <br />THE MINE WILL BE EVACUATED AND REMAIN EVACUATED UNTIL DRILLING <br />IS COMPLETED INTO THE SURVEYED ENTRY. <br />DRILL STEEL (DRILLING-REAMING PHASE) <br />WIPER/SEAL AROUND DRILL STEEL OR CASING <br />COMPRESSED AIR IN <br />VALVE ?N INTAKE AIRLINE <br />AM mom <br />00 <br />STOP <br /> <br />DRILLING & <br /> <br />REAMING <br /> <br />-10 FEET ABOVE <br /> <br />MINE <br />USING A NOMINAL 11 INCH FINAL REAM OUT BIT SIZE <br /> MINE ROOF <br /> DOWNSLOPE OF 6 RIGHT ENTRIES <br /> C A L A SEALED WADGE SEAM WORKINGS C A IL A