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12-0d-1997 9:07x1-1 FRO1~1 ENG. WEST ELK 1~1INE 978 9295QSt7 p 27 <br />~NOV 6'97 15:20 FR BURR ENGINEERING 612 832 2601 TO 9295595--06280th F',bij/Ib <br />1tia Norm Every <br />Fioms p6itip H- aoleea6 <br />6afejse0 Wert Etk "°-=•==d•fide <br />Dace November 4 1917 <br />Jl'~vieet: OB4901aRW W002 Paa• 7 <br />ro) Install pond llrler: <br />• being performed <br />(c) Ins,fall stone cotumne upslope of parklnp la across landslide: <br />• good idea, consistent with Barr's concept at toe of landslide to drain <br />excess pore pressures and provide additional strength in the <br />colluvitlm. Need well to pump from stone columns. Cable anchor <br />~ system within the stone columns and tied to bedrock as <br />conceptualized by Barr would provide additional strength and still <br />provide the desired drainage- <br />(d) bfetell Itme stabYlratlon down swpe or suOStallon: <br />• good idea, consistent with approach to unsaturate the colluvium. <br />Needs to be tested aad coordinated with dewatering wells proposed u> <br />be tested by Barr. <br />(e) Conatnxt RCC buttress of 8oWlef PIIeS east of Portal: <br />• good idea, consistent with approach to stabilize moving portion of <br />landslide. Need to consider whether a flexible wall or rigid wall is <br />appropriate. A properly constructed soldier pile wall (tied to bedrock) <br />with appropriate lagging will act as a flexible wall. <br /> <br />3. Discussion regarding the proper approach to reduce infiltration into the <br />upslope french drain. <br />• Barr will be reviewing this and tentatively is considering covering all <br />&each draiua with an impermeable cover to prevent runoff from catering <br />all french drains- <br />oe2solaWeel-NCST <br />