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<br />Found~tion Explor~t~
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<br />Tho lo.yer of sand, whioh is found \mder tho loam covor in tho
<br />doc pel' portions of the Vo.llcy alluvium, would be a sou,"co of loo.kr.go
<br />unloss 0. outofi' trench is extended to ullwe;:.thorod bedrock" Tho piping
<br />o.ction of pr.rool~ting groundwo.tcrs removing this s[\nd l~yer he.s eo.usod
<br />considoro.blo s:Lu!l\ping of tho o-,cr:J"ing loo.m cove,' in en o.rea illm\C<ll-
<br />o.toly c.djo.cent to the "Ies~ bo.J1k of the dro.ino.gc di tcho If the outoff
<br />tron<}h is ox'Oe;'1c.ted.. pumping \'lil1 be neeess"ry since tho flo\"1 which
<br />h0.8 dovolopcd in so-callod Dry Crook is perennial.
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<br />The bod!'ock foundo.tion is composed of scdimen+.s of the L'lnco
<br />formati.on. Lithologioally th,_,so mo.tcl'iC'.ls present c.n in~betwoon
<br />si tuo.ti:n, boing, i>1 gonorCtl, not c onsolid"tod onough to bo considerod
<br />0.8 good 80Ulld rook and yet not soft enough to be oonsidorod o.lluvio.l
<br />m[\teri[\l. This oondition we.s demonstrc,tod d\1ring tho drilling, Tho
<br />m~teri[\ls wore too hard to drivo in m1d too so~b to efficiently rot[\ry-
<br />drill with tho oquipmen~ usod. The clo.ystonos of the Lonce form~tion
<br />oxposed in o.n:y exo,w:ltion \"Jil1 o.ir-checjk it:. a short roriod of timo.
<br />Because of' the instr.bili';'y o::llibited by tho oln.ys"Gones exposed in tho
<br />resen'o;,r o.rea, undisturbod sn.mples of tho mc.tori/J.l l'Iore scnt to
<br />Deuva:.:" for tasting')
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<br />Constr'"ction Mc.tori(lls
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<br />Impervious mo.torial o.'"Co.S ho.ve beon dosigno.tcd on E::hibi t 4 by
<br />tho letters A, B, ond C. Tho thickel' seotions of' t;1Q loo.n mc,terie,ls
<br />in "re"s A end B aro limited to 0. no.r I' 0,"] st~.;.p along o[\oh side of
<br />Dry Creok Dr[\in. The 10Gm l"yor thins on tho stoop ,,10pos of the
<br />vo.lley ,"",-lIso The heavier soils o.re c.;J?o.ron"oly oonfincd to tho do\'m-
<br />stre~m arco. A, with tho lighter so.ndy soils being found upstrco.m in
<br />areo. B (lnd in areo. C, "'Jhich is "Ion!'; tho top of the ridgo \"'I(;st of thQ
<br />dc.msi to. Samplcs from o.rec,s A ::md B wero to.ken for testing.
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<br />?orvious materi"ls rlOuld proo[\bly ho.vo to be I1-"-uled from the
<br />North T"ktte River, Some se,nds o.rc focmd undo I' tho 10run ln the r.-,iddlr,
<br />of tbo 'lalley cct tCte do.msi to, but thc;,' o.re p;'odom:Olo.ntl;' !ine...gro,inc<i
<br />"Old soley. Ro~k s;nlls of ho.rd limestone c,ro o.v[\ilo..ole from quo.l"ries
<br />on neo.rby To.ble UOillltain.
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<br />The neo.rest source of fine to cor.rse "gr;regccte would l'robr,bly be
<br />the N'J!'th Pl"tto River, c.P2roxim<1tely nine miles north of the dmcsito.
<br />Tho sc',nd found in the vicinity of the d"msite nould require \'J<1shing
<br />o.nd scrooning ~nd is l~oking in co"rse fr:lotions o.nd in qu"ntity.
<br />S:lmples of a pit run scmd wore to.ken from o.n cereC( on tho North Pl"tte
<br />Rivor presently lonsed by tho Gering & Ft, kro.mio Irrigcction Distriot
<br />in the SW.t of seo, 14, T. 23 N., R. 58 W., of Scotts Bluff County,
<br />Nobro.ska. Tests of thesa samples in tho Bureo.u lc,boro.tory in Denvor
<br />indioc,to thnt the m"terio.l is of fc.ir quality, ',nd mr,y be used o.s
<br />ooncrete nggrogr,to providod proper gro.dings o.re obto.ined and it is used
<br />with 0. comcnt low in (lIke-Ii. A oonstruotion oompany opcro.t.oc 0. r:>;-I: .,
<br />few lniles dO\'41stroo.m in seo. 19, T, 23 N., R, 57 W. This s[\ntl
<br />(ocrccncd, ','w.shed nnd londod-) prrJ~CJY':ly .c':J~+'~ f" r:r;'xh:~ f\. yr~rd.
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