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• <br />MINE ID # OR PROSPECTING ID # <br />(Page 2) <br />M -77 -378 <br />INSPECTION DATE 8 -31 -94 INSPECTOR'S INITIALS ACS <br />OBSERVATIONS <br />A pre -pour inspection was conducted of the Terry Tunnel bulkhead location. The anticipated <br />date for pouring the reinforced concrete bulkhead is 9 -1 -94, the day following this <br />inspection. <br />All elements required to complete the bulkhead installation were in place at the time of this <br />inspection. Terry Tunnel flow is routed to a sump inby of the bulkhead location, then pumped <br />through the bulkhead bypass pipe. A cofferdam has been constructed of wood lagging wrapped <br />in a plastic sheet. A second arm of the bypass pipe has been tied into the coffer dam 18.75" <br />below the crest. This will provide bypass of the Terry Tunnel flow in the event of a pump <br />failure. 60 pound bags of the specified concrete mix are stacked at the concrete pump <br />location. Fresh water to be used to mix the concrete is stored there in plastic tanks. The <br />meter used to measure the water input to the concrete was inspected. Two concrete mixers <br />have been set up at the site. <br />The bulkhead forms are constructed of heavy wood lagging, and are braced by angle iron pinned <br />into the sill, back and ribs. The forms are further braced at the sides and base with heavy <br />duty pipes bolted to the forms and the perimeter of the tunnel. The stainless steel bypass <br />pipe is in place, and extends approximately 16 inches beyond the forms at either end (the <br />stainless section is 11 feet long). Re -bar surrounding the bypass pipe was being set at a <br />45 degree angle and tied into the main re -bar cages at the time of this inspection. This is <br />in accordance with the specifications approved in TR -16, including the criterion that these <br />bars cross a minimum of two horizontal bars in the main cage. The small observation pipe <br />has also been installed. <br />Scaling and washing of the bulkhead location was very well done. No loose rocks remain, and <br />the location was free of and dirt or residue. This degree of preparation will maximize the <br />bond between the concrete bulkhead and surrounding rock. No adverse geological structure was <br />observed at the bulkhead location. Structure observed consisted of three steeply dipping <br />sets of very tight joints with a white mineral in- filling. <br />A number of quality assurance measurements were made at the bulkhead location, and are <br />summarized below: <br />1. 7" re -bar spacing at all points, air side cage. <br />2. 12" re -bar spacing at all points, water side cage. <br />3. Water side depth to re -bar between 3.375" and 4.25" at all points measured. <br />4. 128" across widest part of bulkhead location. <br />5. 129" across highest part of bulkhead location. <br />6. The thrust collar is 3/8 inch thick and 2" tall, yielding a 10" 0.D. and is located 67" <br />from the downstream form. A second identical collar has been added at the upstream face, <br />a non - structural seep collar has been located 33.5" from the downstream face. <br />All of the measurements fall within the approved specifications. <br />All bulkhead site preparations observed are adequate to allow successful bulkhead <br />installation. Sunnyside Gold has met or exceeded the Division's requirements for site <br />preparation. <br />cc: Jim Stevens, DMG <br />I & E Contact Address Carl Mount, DMG <br />❑ CE <br />NAME Larry Perino ❑ BL <br />OPERATOR Sunnyside Gold Corporation ❑ FS <br />STREET P.O. Box 177 ❑ HW <br />CITY /STATE /ZIP Silverton, CO 81433 ❑ HMWMD (CH) <br />❑ SE <br />❑ WQCD (CH) <br />❑ OTHER <br />