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a cutoff trench, grout curtain or impermeable blanket as required <br />to assure the water holding capabilities of the dams. Figure <br />D-10 shows a typical cross section of the type of design that <br />will be utilized for both Davis Gulch and Middle Fork dams. <br />GNIf Llll .lPlf ORY <br />•R(E BORRO~ <br />NORVfL aGt(R )N[i CL~ <br />44 iE SLEN ~~j <br />_' .,.,.,. W ..,u <br />R FMOY / CAPE \\ RRMp[gIE <br />C~~S IIML L9pUMp <br />C pNCP[iE CviO[[ COUP OUiLCr nnE .., <br />~Ep+ <br />CUl O!~ 1. [MCw <br />~_I <br />FIGURE D-10 <br />SIi~LIN4 <br />BP~ <br />CROSS SECTION OF A TYPICAL EART$ AND ROCK FILL DAM <br />The Davis Gulch Dam will serve as a major catchment area for <br />water from the Davis Gulch watershed which may be affected by <br />plant operations, processed shale disposal, or coarse ore storage. <br />The design capacity of approximately 1,200 acre-feet will store <br />runoff from the probable maximum thunderstorm of 6.5 inches per <br />hour. A safety spillway will be available in case of unfore- <br />seen emergency. Water stored behind the dam will be utilized <br /> <br />D-27 <br />