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DER <br />OROILMING <br />A Dhow. et Kr..a.4 <br />RECEIVED TIME JUN.16. 3 :43PM <br />June 2, 2000- Clear water was observed flowing out of theiriser at an ap <br />5 gallons per minute. Possible water sources: return flow <br />o <br />m north dec <br />around the steel riser, or flow into the pipe at grout holes 2 or 3 whic <br />unknown quantities of slurry grout prior to setting of the grout. <br />June 5, 2000- Cleaned & replaced drain plates or bricks at the tower. Rei <br />casing into decant line at hole 7-'3. Water level tests initially indicated th <br />water was detected above the pipe at Grout hole # 3. Watet flows were <br />reduced. (3 inch casing installed into 3 ¶i. hole in the decant.) Hole was <br />ultimately verified interception of decant, as water was displaced at riser <br />lowered the water table at the riser & exposed a boil at ground level aro <br />June 6. 2000 — Discussions held regarding new scenario. Decision made <br />decant line such that low mobility grout plug could be installed. Decisio <br />grout hole ir 2 for installment of low mobility plug. <br />June 7, 2000- Hole ar 2 re- installed. Small void detected which seemingl <br />infiltration theory through access holes in the pipe at locations # 2 & #3. <br />Hole a 14 was drilled in an attempt to intercept the north dcant line to n <br />15 was moved to the North 2 `. Hole * 15 ( Grout Hole # 4) encountered <br />decant at 10'. Grout was detected in the decant, however a void of appro. <br />inches was discovered. <br />June 8, 2000- Pumped 2.5 -3.0 yard plug into grout hole # A. At the cro <br />additional 15 cubic feet of grout was installed to seal grout;hole 42. Oper <br />moved to the riser tower. 7.5 yards of low mobility grout las injected int <br />Upon completion of the grout plug, massive water flows were detected at <br />Ironically, only minor displacement occurred during the grout plug ins <br />June 9, 2000- Bncks on the tower were raised by DG/HB p6sonnel. Mill <br />raised brick level even higher in an attempt to equalize the suspected wat <br />June 12 2000- Slurry grouting commenced at grout hole Ti, Water was <br />operations. Grouting continued until: sand & water boils around the rise <br />stopped, when grout was measured in the riser itself, and when pressures <br />psi. Approximately 20 yards of slurry was injected into the pipe. 1.5 yar <br />injected at the crown of the pipe to seal the access hole. <br />June 15, 2000- No detectable flows have been observed. <br />PRINT TIME <br />JUN.15. <br />oximate rate of <br />t, flow from <br />washed out <br />stalled grout <br />t 7 -8 feet of <br />ticeably <br />it tested and <br />ower, which <br />d the riser. <br />o locate north <br />made to re -drill <br />verified water <br />avail. Hole i <br />e North <br />innately 10 <br />of the pipe, an <br />tions were then <br />grout hole # 4, <br />the riser. <br />ation. <br />personnel <br />r level. <br />splaced during <br />pipe were <br />xceeded 200 <br />of grout was <br />3 :45PM <br />