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<br />.' ;.'PROJJj;CTREPORT
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<br />,fINON' CANON])A!o!
<br />.T!tINJJJAIi, .' QOLORADO
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<br />P,PPElIDDt II
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<br />'BASIS OF DESIGN
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<br />, I':IN):'RODUCTION
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<br />1:01;. PUrPOSEj and seope. - The purpose of/this appendix is to
<br />present. ti)ebasj s of; design, exclusive of hydJ?ology, of. the projeet
<br />plan and'struc'Jlres therein for the Pinon Canon .Dam. ])esign criteria,
<br />assumptions, and analyses for the embankment, hydraulic ahd struetural
<br />design of the prineipal engineeririgfeatur,6s are aesbribed and dis-
<br />eussed, .
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<br />I1'- EMBAI~NT DESIGN
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<br />2-01;. Soils investigation. - To secure the information neeessary
<br />for the preparation of the projeet report, a soils exploration program
<br />~as eomp1eted embracing foundation investigations and investigations
<br />ror:e,ll)bdnkment materials. FoUndation explorations for the dam were
<br />.aceoII\P.i;J.~hed by four auger holes, drilled to .the top of the shale or
<br />sandstone formation, or to the maximuni depth of 26 feet. Soils for
<br />the dam i3mbankment to be,. obtained from the borrow area upstream fr-om
<br />'.the., dam were investigated by nine auger holes, drilled to depths vary-
<br />ing from 7 to 20 feet. The location of th~ auger hoJ,.esand gr:aphic
<br />logs of the subs.urface explorations indicating soil cla.ssifieation of
<br />foundation materials and embankment' matexiAs .are shown on plate 2 of
<br />thi;J projeet report. . Samples obtainf)d from the abOVE>. f:ieldeJq)loration
<br />'., WEjr!'l :tested .in the laboratoryfor gradation~lctterberg .limits,-optimum
<br />um:t drY weight, and optimun(moistureeontent. The results of: th<3se
<br />)aboratory tes'tsare sumniatized.:l:n table 1. . .
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<br />2-02, Foundation conditions. ,. ResuJ,.ts of the testsper~or.II!€ld
<br />,em .t11!" dam fouridation material; ,f3how. that the fouridation wouldb.eim-
<br />.pervi6uf3, .i3xeept for the top 4 feet of, thi3 .stream.,bedwhichis cl,.i;.ssi-
<br />fied asgrav\'311y siltys.and. ThE;) !SI'avel:l}': silty sand. deposi,U::1 the
<br />~ .lies. entirely within. a trench e.l:;2j;!~.j"v,.J,~~. This-
<br />materiBrwoillcfoe re'moved in order "tha.t' the' entire foundat;i.on1:le of
<br />., ' impervi.ous.m<!:terial, thereby elimi,nating, the possibility of seepage.
<br />I,. In addij:,ion, , all .of the.. exposed weatl1\lredshale 'W9uld be' removed during
<br />the operation of stripping and removal of the silty'sand deposit.
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<br />Append:i.:lc II
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