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<br />this clay underlies an area of at least a square mile and hence is an
<br />excellent source of material from ;vhich the core of a dam can be
<br />constructed.
<br />RESERVOIR SITE
<br />
<br />The site is excellently chosen from both topographic and geologic
<br />viewpoints, in my opinion. The rock formations dip gently upstream
<br />and none of them has been made cavernous or otherwiEe perviouE
<br />except well on the uplands. There is nothing to indicate any proba-
<br />bility of important leakage in the reservoir.
<br />
<br />AVAILABLE MATERIALS FOR DAM CONSTRUCTION
<br />
<br />As mentioned above, there is an abundant supply of impervioUE
<br />clay in the northern part of the reservoir sit.e along the dam axis.
<br />This material is, in my opinion, entirely suitable for use in thecore
<br />of an earth-fill dam. The great abundance of other surficial ma-
<br />terial, principally sand, sandy clay and comparatively fine gravel
<br />is readily available for constructing the earth fill. Suitable limestone
<br />for riprap and rock fill can be obt.ained from quarry sites within less
<br />than one mile from the south end of the dam axis. There are ex-
<br />tensive deposits of relatively clean flint gravel, suitable for con-
<br />crete aggregate, within one or two miles distance from the south
<br />end of the axis.
<br />
<br />0021?4
<br />
<br />Water Resources Development
<br />
<br />LOGS OF TEST HOLES
<br />
<br />TEST HOLE No.1. ELEVATIO>1, 1,109.2 FEET
<br />
<br />Soil, black ....................................
<br />Clay, buff to gray.. . . . . . . . . . .. . . . . . .
<br />Gravel, flint fragments...........
<br />Calhoun shale
<br />Shale, light gray, hard. . . . . . . . . . . . . . . . . . . . . . . . . . .
<br />Deer Creek limestone
<br />Ervine Creek limestone
<br />Limestone, brown and gray, weathered, numerous
<br />soft pitted zones, abundance of algal remains..
<br />Larsh-Mission Creek shale
<br />Shale, buff and gray clay. . . . . . . . . . . . . . . : . . . . . . . .
<br />Shale, black, fissile... . .. . . . . . .. . . . . . . . . . . . . .. .. .
<br />Shale, dark gray to black........................
<br />Rock Bluff limestone
<br />Limstone, dark bluish gray.. . . . . . . . . . . . . . . . . . . . .
<br />Oskaloosa shale
<br />Shale, light gray, soft...........................
<br />Shale, greenish gray, hard...... . . . . . . . . . . . . . . . . .
<br />Shale, light gray.... . . . . . . . . . . . . . . . . . . . . . . . . . . . .
<br />
<br />", r "," '".' . .
<br />
<br />-," .'..' .... ~
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<br />.'!.:~-'''''':'
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<br />
<br />
<br />"
<br />
<br />43
<br />
<br />. - :~.
<br />
<br />.. .... .
<br />
<br />--. ....
<br />
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<br />
<br />.".:<
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<br />
<br />'-.' .....
<br />
<br />
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<br />
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<br />
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<br />. . - . .
<br />" ....:..:......::.:::..:..
<br />
<br />:,;;~::..t:'i:.r/:;(.:l,;;~~:.'~';{
<br />
<br />.. . -.: ~ . ".", ..
<br />."..' "..,.. ......:
<br />
<br />Thickness, Depth,
<br />feet feet
<br />2.50 2.50
<br />1.50 4.00
<br />4.30 8.30
<br />0.30 8.60
<br />
<br />.....
<br />.. .. ... "-.;
<br />
<br />..:.. ":::::.;/\'.-:'..:::~;;.~:!
<br />
<br />.......'.
<br />? :':~:<.'~;::;~ .::~.:.~:::t
<br />. . ".::<::l': ::;:<.->.
<br />..:..:.:,:....:.:_.:~-::...:':-.. . . .
<br />:.....-..~:.:......;....::::..<':..
<br />
<br />8.20 16.80
<br />2.50 19.30
<br />0.40 19.70
<br />0.80 20.50
<br />2.70 23.20
<br />9.80 33.00
<br />2.00 35.00
<br />1.80 36.80
<br />
<br />::~:.;. ".':
<br />
<br />......-:. "" -.-.".".
<br />
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<br />'.- ",., ,......
<br />
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<br />",,' -, ....
<br />: :' :": - ::.~' :-. ~ ~; ".::' .
<br />
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