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<br />. . <br /> <br />000083 <br /> <br />. -. - ':'.'~" . ".-.--" -- . <br /> <br />RECOMMENDATION <br /> <br />MINTURN EARTHFLOWS TASK FORCE <br />RECOMMENDATIONS <br /> <br />OPTION 4: WAIT UNTIL THE LAST MINUTE <br /> <br />TlMEFRAME <br /> <br />RESPONSIBLE PARTY <br /> <br />..." <br /> <br />ESTIMATED COST <br /> <br />Unknown <br /> <br />Ma 1 n ta I n conve'i,Cnce <br />capac i ty of the" <br />channel <br /> <br />Provide seepe,e <br />pa th ins 1 i de <br /> <br />Siphon water over <br />slide <br /> <br />Pump wa ter over <br />slide <br /> <br />., <br />\. <br /> <br />Excavate overflow <br />spillway in dem <br /> <br />Blast an overflow <br />spi llwey in the <br />hillside, cut a <br />channel and blow <br />rock over the <br />sp i ll'"ay <br /> <br />Cause controlled <br />failure of slide <br />dam <br /> <br />.~ . <br /> <br />0012:nsh <br /> <br />InterIm solution In <br />in the event of <br />movemen t. <br /> <br />County/State/U.S. Army <br />Corps of Engineers <br />during emergency <br /> <br />Not feasible due to <br />volume involved. <br />Dangerous pIping <br />hazards. <br /> <br />Not feasible; unsuc- <br />cessful at Thistle, <br />Utah, due to slide <br />movement and volumes <br />involved. <br /> <br />Not feasible due to <br />the number of pumps <br />requIred. po~er needed <br />and the availability <br />of equipment. <br /> <br />Preliminary design <br />concept and specifi- <br />cations should be <br />developed for the <br />f i 1 e . <br /> <br />Oivision of Water <br />Resources to develop <br />preliminary concept <br />and specifications. <br /> <br />Not practical; <br />blasting results <br />may be unclear. <br /> <br />Best concept after <br />the immediate danger <br />has passed -- <br />breech i ng ma y be <br />time-consuming and <br />not cost-effective. <br />Negative downstreJm <br />sediment impacts mcy <br />occur. <br /> <br />-x i i i- <br /> <br />Unknown; <br />would require <br />supply of <br />polyvinyl chlo- <br />ride linen <br />to construct <br />spi llway. <br />