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<br />~• <br />in cote hole C179 and is tho stratigraphic equivalent of a 32 foot thick bed of whin naheolite that ~ y <br />contains about 82%, by weight, nahcoliu in core hale C 177 about a mile to the east. <br />Ia light of the face that (1) the Yankce Gulch sodium lease area is underlain by w in- <br />place shale-oil rpottrce of more than 6.12b bil&on barnls of oil; and (2) that collapse and <br />passible surface subsidence occurred following solution of saline beds in the geologic pest, I <br />recommend: <br />A. A monitoring program be undertaken ro determine what effect the circulation of hat <br />water with a tempertmrre of 300° u 400°F over a period of time, posably exceeding a <br />year, might have on the 600 to 630 foot thick sequence of iaurbedded nehcoliu ~d <br />oil shale. <br />H. After the completion of one or more solution mined cavities that the wre holes <br />drilled to monitor possible subsidence be dulled midway between the aenur of the <br />cavity and the outer edge of the caviry. 1'he core that is obtained should be <br />physically examined and analyzed to determine whether there is any depletion of <br />organic content and dawsonite content of the oil shale, evidence of nay catagenisis of <br />the kerogea including a lessening of the compressive strength of the oil shale which <br />might affect the structural integrity of the mined rack sequence; and <br />C. lastly, whether there has in fad bees any collnpae m a result of the solution mining. <br />Yours truly, <br />John R Darnell <br />