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."'- ,,,"'" ... <(cou I,() ~ '<j<;f'<;f' <;f' 00 ~ ~~ :? ~ ~ II) ),~~ L~ U ~ O';;"yYV;';' ~C\.I~~~~~/r----co CO o;;tQ- 0 II) r0 o;;t 1-, V';'lr,,\, "OOOOOO\;J-::LO':1- ~O IOl;; 0 - Q l'- 0 0 7,j>,y\\ <;J"q'"t~<;f<;f III:Z: rf'l ~ 00 0 <:t <r <:t O...y'l/ -S--. ~ 'I'" III:r::r::z: 0000 0 0 0 f"") f"") ~ ~I (\J ~ kD__<:t ___ _~9"'Oci'O--',+;jS 82:> '" 0 ",-:g-~= II I -\~j~i-~ ~.g~I:2ItO\\'\I'ill'I/~~~i'l\ /; I\ \' ~ ~ ~ ~E ~ itVO jj} ~,J-T-:-I-''---- t "-t+-~k -~l'"-~TI,!t-~-I-f, '--'+--'-]-]-'1-]-'1 1 1 ~, /~ I 1 1 it'; I /, j I 1 I j 1 I 1 11 I TURNING POI NTS __L-_~___---+-- _~ :-'1 ~~'\_ l! 1 I il ~,~ :\~r ,,' '''"'--ARK:NSAS RIVER t Z PART 2A OF SECTION A-A / \ 'PART 2C OF SECTION A'A DWG 382- D- 803 DWG 382-D- 805 Z 5000 o o ;;: ~ ;:; I I~.__ _ r-~~~ ;'; " i ------1- I I ,l '" o r0 N 0 r0 C\.I_rf'l___~-N-~,,_~ N---- I 0.. (L I (L I o <:l: <( 0 <:l: 0 ::r-----"'--T~___ -:r-__" 1 1 >- <( > w -' w 4600 .---_1 1 PART I OF SECTION A-A DWG 382-D-802 5000 PROJ 0 ANGLE FROM VERT 30 ~8EARING N 130W --- DH 411 E!,4923,8 PROJ. -- DH 100 EI_49i292 Z 4900 o >- <( > w ~ 4800 /' / > ------/ /-- / / ( / v' 11-27-68 4700 --- PROJ DH 102 E! 48188 o'r J 11 106L:! 1'1 19b-~ ~ 286'p f-l 372,@.C..C. 42~ WL I ~~:I 3- 2-66 t :-.1 I I r I I I 70\.'~ I I I I II 96UJ 3 - 2-66 AP 301 -TpP~f~ 7 EI 4872"1 E1.4863,91 -11-' I I I I I I I I --I I- I I I I I I I I L~ 3 - 22 . 66 o 12- 4-64 5-- 23-67 0-10 6' LEAN CLAY: About 901. medium to h~gh plasticity fines' about 1010 fine sand. High reactl0n to H~1h Maxim~ size: Fine sand; color - white to greYls white. (CL) 6~ ha d nd fine 10 6' -19 0' POORLY GRADED SAND: About w. r sa , 'to co~rse; about 35% hard subrounded gravel? and ~~~~t r5% fines. Moderately reactive to He1. MaX1tIlUm S1 . 1-3/4'" color - greyish brown. (SP) 19.0 '-28.6' SHALE: Compact, mod era t~ly ~eath:.ned to Slightly fractured (3 fractures 19 -29.)' 0 and 450 51! ht1 reactive to HC1. Fractures d1p 90 . d A f~w thin (1/16") bentoni~e seams: Limon1~e sta1~~ts on vertical fractures. S11ghtly f1.ssile. ore sp -5" . t 1/4" bed with strong hand pressure. Beds ~ip 0 . ~:l~r - greyish black; Maximum core length 0.4. average length is~.2'. d 28 6'-37.2' SILTY SANDSTONE and SILTSTONE: ,Har " . rincipally massive, silty sandstone 28.6 -~6.0 " ZFine-grained) Interbedded, Siltston~ 36.0 -37.2 'It Beds dip at 0_50. Color - greYlsh Whlt~ to gre~.tu:d to slightly reactive ~o HC~. N~n ;~ds~~~h~~~f3;~3'_ . 3 fractures.present d~P 5~h' ~ 2' average core length ?5.3~i ~x~i~~~epy~~~e mine~alization at 31.8'. 37 ~~_42.0i SHALE: Hard, compact, t;on ~o Slif4~l~:l~~~h . eous slightly fissile. Core SplltS 1I?to 1 4 (1/16") high'hand pressure. A few thin bentonlte S~~tl . one bentonite bed at 40.2'-40.4'. NOli to s la-' Y ish fractured One fracture dips at 30u. Color - grey th black. ~ximum Core Len~th is .4'. average core leng is 2' Beds dip at 0-5 ' ined 42 0'-70 0' SANDSTONE: Hard, fine-to medium-gr. , . cemented , sugary. slig~tly calcareousj Sliftl~Oto moderately porous. Sllght vuggy appe~ranc . B slightly weathered. A few thin (1/16 ) c~r~ceou. streaks on bedding planes. Beds dip at 5 -15 . 6 Slightly to moderately fractured, approxi:;~ibo d fractures per 3 I of core. Fractures dip - an 900.' Core is badly broken into .2' l!ngth8Ialo~lor _ bedding planes. Maximum Core Length 18 1.1 . greyish white f' dium 70 0 '-90 0' SANDSTONE: Hard, cemented, lne' to me 'grain~d, sugary, non to slighL1y calcareous; slightly POrous, Non weathe-red except on di 500 fractured (4 fractures per j core). Fractures p d 850 Slight pyrite mineralization in sandstone. d ~ximum' Core Length is .7'. Color - reddish white an orang18h white. NOTE: Water level eiev 4749.2, January, 1970. PROJ DH 22 E 48364 o'~ 5' /. W, L -' ~ ~ EI.482C. 4 L J 3'16:5-0 i"4~7""!~ ~ -~ 58~ 'I II ,37.2'ki 71.4'~ 76.4'R 81,LJ 3- \6-50 PROJ DH 412 E14816,52 o~;l ~;J 11 l"j 16,1~~'1 20.71"3 27.1'~ ~j 8~ 43.8'B II 1':'1 Iii II I' II Ij 794 UJ 5- 6- 68 o H 400 f DH 401 OH 40lA DH 401 c~ PA R T 28 OF SECTION OWG 382-0- 804 SECTION A-A KEYS TO PARTS 4GO I 400 I 800 I SC4LE OF FEET ---- PROJ - PROJ DH 21 AP 302 E14656_8 EI, 4B53 + w; n ~ 3-29-501 I 12-4-64 11_,_." I I I L.J 3.29-50 PROJ AP 303 EI,4840:t ~:::: 12-4-54 0-5.0' SILT; hard, 5 0' -14.71 SILTY ClAY; hard packeJ i , 14 7' - 58 0' SHALE' wea the red , 14.7 -17,5 ; blue, hard, '17.5<22.3'; bl~ck 22.31-46.4; blue, hard ~cked" 46.4'-58.0'; layers of soft gray shale 51.4 -56.4 . 58.0'-67.2' SANDSTONE; hard. , 67.2'-71.4' SHALE; blue, soft, wlth layers of soft. gray 7l.Z~~i6:4' SHALE and SANDSTONE; hard. 76,4'-81.0' SANDSTONE; h"cd, 0-16 0' + LEAN CLAY no sample, (CL) 16.0;t-20.7' SILT/SAND WITH COBB~S, no s~mple. (SM) 20 7'-27.1' SHALE: Hardness 5, bnttle, ultr-clarey, . sli htl weathered beds horizontal and 0.5 -1.0 thick, fis~ile:blocky, top 0.2' bed of bentonite, bentonitic beds 0.1' at 23.0' and 0.2' thick at 2~.6 , charcoal, color' vertical joint and limonite sta~n4e~,fro~ ~g'~,- 22 0" open joints dip 500 and 400 at . an .. Ma~. ~ore length: 0.6', average 0.25'; air-slakes, water-s lakes in 5-10 minutes. 27.1'-43.81 SILTSTONE, Shal y: Hardness 7, 5-6Iwhere,mare shaly silty to very tIne sandy, shaly 36.4 -41.0 beds di to 50, beds 0.4'-1.2' thick, carbonaceous stains ~nd seams (1/16") along beddi~g pla~es, selenite gypsum crystals on bedding planes 41 -43.801 many shaly laminae wavey and broken in part in top ~. b . k:.nrn part carbonaceous stains and laminae wavey an , ro in bottom 3.0', bentonite from 36.3':37.4 , ~O~Ya~032 2' dark gray where more shaly, open jo~nt dip 1 . ti ht joint limonite-stained dip 350.at 42.7 , and,open jo~nt limonite-stained,with slicks d~p 35 at 40.9 . Max core length' 1. 2 , average 0.6 . 43 8'-794' SANDSTONE: Hardness 7, fine t~ me~ium grain, . su ar' orous siliceous, crossbedded 5 -20 dip, be~s b: 51? -4.0' . thick, beds become more massive with de th vuggy (-1/4") with many carbonaceous stains, no~ul~s and laminae in top 10', f~ c~rbonaceous f stained'bands (2"t) in bottom 26.0 , l~ght gr!y to d~uf with blac~ stainir;g in tOP65108jO' i fe~r~~~~r~~ ~~:ht ~o 600_800. lron.'stalned at .' , ew . 3 7' open steep to vertical dlp. Max. core length. . aver~ge 1.4 I. Hole dry at 60' on 5- 8 -68. Hole caved to 53' on 5 ':"'13-68, PART 3 OF SECTION A-A OWG 382-0- 806 PROJ DH 22 E1483641 ~-, "16.501 L- I I I I L.J 3-16-50 PROJ AP 1406 EI 4821 ! g:M 7'~ II'~ 9- 23-66 PROJ, DHI5 E14813.82 o'Pl 5~ ~8'5'~~.:. la5' ~ CD 26.6' ] 33'~ 3S3'B 1<1 IJ 51.8'LJ 6-22-48 ., o o ~~ 00 ",,,, a.I '" ~o~ o;t" ~ J: ~ia (J) 6 ~[r ~ I 1 l1!t - ~ !'I I " , a. >- '" <D N '" ", ," a. >- () I o PART 4 OF SECTION A-A DWG 382-0-807 o .... '" N o " , .... ., <D 0 N - a. I >- 0 PROJ 0.0'-6.0' SHALE: Clayey, silty, micaceous, limy "with many.very DH 100 limy seams (-1/18"), few bentonite seams (-1/2 ) 0.0-1.5 , very EI,4712,92 weathered soft but brittle, platy 0.0-2.0', Color: dull brownish- 0' gray 0.0-2.01, gray with white streaks and cf:atlngs throughout; ~ many hairline roots Maximum core length: 1, average core 6'~ length (1/4") core'broken from fractures and drive sampling. ~ 6.0'-45.2' SHALE: Silty, clayey, comp,act, limy, fissile, slightly .! weathered, few calcite seams.(-1/16 ), many fo~sils (o~ster shells) 43.6-45.2', thin-medlum bedded d~p 0-5 , ~olor. dull - dark gray' ferruginous siltstone bed (-1 ) at 8.7 , bentonite -I seams l"t'at 18.01, 25.0', and 25.4', bentonite bed 2.7' thick at 40.6' limonite stained and gypsiferous inopart, light gray and orange in color' open joints angle of dip 45 to near vertical ~ spaced about 1.5' apart from 8.5-38.8', Maximum core le~gth: 0.1', ,~ average core length of 0.05'; core breaks down into 1/8 pieces 147 n after 5 minutes in water. 1"01 45.2'-147.0' SHALE: Silty, well indurated, fissile, few minute W.L ,42:::1 calcite seams few dolomitic laminae, few fossils (yellowish- EI4754_+J..1 brown concretions), medium-thick b7dded di~ O-So,.Color: dark 3-21-66 1:::1 gray-black; open joints angle of dlp 30-60 , few J"{)"I'il'tplanes b: are partially healed with calcite and some with ty~sumJ few , I~:.::I slickensides, soft beds 2"t thick at 140.0', 141.1 f and 143.7 , '::::1 Maximum core .len9th: 0.9', average core length 0.3 , core breaks ~ down intu 1/8" pleces after 5 minutes in water. 1....:1 147,0'-194,0' SANDSTONE: (transition from shale) Fine-medium 'j grained, siliceous, well cemented-hard, slightly-mod~rate h, porous medium bedded-massive, wavey in part dip 0-5 , few II calcit~-lined vugs (1/8"!), and calcite seams (-1/16") l64.6~ 1'1 166.2', interbedded shale, silty, dark gray from 157.6~158.7 , 194'H 160.5-161.0', and 162.6-163,0', pyrite flakes at 150.3 , ;:::1 Color' light-dark gray' open joints angle of dip to core axis 200.'""'" 35-50; at 160.3', 162.6', 163,2', and 17~.3', tight ve;tical 3-22-66 fractures from 166,4-167.8', 177,4-178.2 , 180,O~180,4 , and 192.4-193.0' open vertical fracture 1?1.1-192.1 Maximum core l~gth~ _~.~I~a~e::g-=--~ore length 0.7 . :g 0 N .. a. I <( 0 5000 Z o a. >- '-r I I [ , <( > w -' 4600 w PROJ DH 26 EI 47985 -I I I I I 1: 194,0'-200.3' SHALE: Silty, well indurated, poorly fissile, medium-thick bedded dip 0_50, Color: dark gray-black, Maximum cor-e len~th: 1.9', 'average core length 0.3'; core breaks down into 1/8 pieces after 5 minutes in water. NOTE: Water level elevation 4809.8, January 1970. PROJ AP 1406 EI 48211: PROJ DH 23 EI 4827.0 w_~"~ -----1 In I I LJ 3.30-50 r, ~-' 9-23 -66 PART 100 I OF SECTION A-A o 100 1 I SCALE OF FEET 200 I 0-2.0' LEAN CLAY. Approx. 85/0 fines.uf medium to.high plasticity medium toughness, no dl1atancy, med~um to high dry strength. Approx. 15/0 predominantly fine sand. A trace of angular fine gravel (limes~one. chips). Rapid reaction to HCl. Maximum size 3/4 lnch; color - gray; moisture - dry. In-place Condition - firm to very firm dry dense mottled, grass roots. 2.0'-7.0' riAN CLAY. Approx. 8DZ fir:es of medium.to high plasticity medium toughness, no dllatancy, m.ed~um to high dry strength. Approx. - 10/0 brit t Ie, angu lar, coarse to fine gravel (limestone chips). Approx. 10% predom- inantly fine sand. Rapid ~eaction to HCl. Maximum. size 3 inches; color - gray; mOlsture - dry. In-place Condition - firm, to very firm, dry, dense, mottled. 7.0'-11.0' SHALE, weathered. Only enough was screened through the #40 sieve to perform the hand tests. Approx. 90% fines of medium to high plastic~ty, medium toughness, none to slow dilatancy, medium to hlgh dry strength. Approx. 10io predominantly fine sand. None to slight reaction to HC1. In-place Condition - very firm to hard, dry to 9,0 feet and slightly moist 9,0 - 11.0 feet, dense, lamina ted, tan to brown. Gypsum crys ta Is throughout. (Modera te ly wea the red at 7.0 feet to slightly weathered at 11.0 feet). Refusal on sha 1 (' fl t 110 feet 0-5' SANDY CLAY 5' -8 5' GRAVEL and SMALL BOULDERS 85'-185' SAND, GRAVEL, and SILT 18 5' -26 S' SHALE 26, S' -33' SANDSTONE 33'-383' SHALE. black, 611 streak shale at 36.4' 38,3' -51.8' SANDSTONE PROJ DH 23 Ei 4827 0 0'17<") ,~ 72EJ E3 ~ ~ ,,'! :~:~ 61.4'1=1 664'[J 3-30-50 W.L. E!. 4817,3 .,.. ~-30-50 PROJ TPI447 Et 4819I o~ 141 205'l!.;;J I I: 67 PROJ DH 413 EI482376 , fi 1 ~~ 9' 26,66 II,' 5~7~~68'''-l~ ~~~~_____ 5 -13 -66 LJ 4-3-50 PROJ PROJ. DH 102 DH 412 EI48188 EI 481652 fl ~l I 1----1 f n"tl.,.J I 1 1 3,2'661 I I I I I L.J LJ 5-8~68 3-2-66 PROJ AP 1411 EI_4800:: 4 - 3 -50 0-7.2' SILTj few rocks ar:;d shcd>2 [Llgr;1ents 7.2' -43.5' SHALE; weathereu 7.2 I -1 ~ I, hard hard with soft layers 2] .4'-31.4', blue, 43.5'-51.4' SANDSTONE, hard. 51.4'-56.4' SHALE, black. 56.4'-61.4' SHALE and SANDSTDt,':, black 61.4'-66.4' SANDSTONE, hard. 12'-21.4Ij blue, soft, 31.4'-43.5' 0-14.0' SANDY SILT, approx. 65;; fines w~th no pla~;H.~.... . s light toughness, quick dilatancy, s 11ght dry strength approx. 35% predominantly fine sand. A trac;:e of hard, angular fine gravel (limeston~ chipst" Medum:I to . rapid reaction to HC!. Max. S1ze 1/4 j color - tan~ moisture dry. In-Place Condition Firm to yery flrm, dry, dense, homogeneous, grass roots top 1.0 14.0' -20.5' WELL GRADED GRAVEL with cobbles an? boulders A trace of plus 12-inch boulders. Approx. 5% 5 to l2;1nch cobbles. Approx. 5/03 to S-inch cobbles. Approx. 60% hard, subangular to rounded, calcareous .an~ gypsum coated coarse to fine graveL. Approx. 3570 hard, subang~lar to rounded, coarse to fine sand" with some. calcareous and gypsum coatings. Approx. 5% nonplastlc fines. Slight to medium reaction to HCl. Maximum Size 12 inches; color multicolor; moist':1re dry. In-Place Condition M=dium to high denslty, dry, dense, heterogeneous. Some limestone chips present. 20.51 SHALE, moderately weathered, limit of backhoe. PROJ DHI5 EI,481382 _~L. s':;~8fl--~----- I I L.J 6 -22-46 PROJ TPI447 EI 4819::t r, LJ--------- 1-11-67 ... PROJ DH413 EI482376 0'f77! ~3 ~;1 V;.! 18'~:;I 218'1 ~ 38~ d r~ 524 [..:1 I. I I I I I r I W L f I EI.4748,56 r-fl 5- !4-68 eo.[J 5 - 13-66 PROJ ANGLE FROM VERT 300 BEARING N, 13 W DH 411 EI 4923.8 o. /~, ,,;;.;- ~9' ?;';f ,~ ~~d >.~W ~~ .> ~~ 9>_@ ~ ~~ ~~ '" ~1'j 9~V 11- 27- 68 J PROJ DH 21 EI 4856.8 0' n 49~ !!I ~ El.4~;7. 8 ~J 1, ~ 3'29'50 '~ I I.~ s,.4'~ 91-2'H _l 96 q-, 1.1 1062'LJ .-1 I I 1 I -.J TURNING POINTS ~~~c~~~~~ -803 ___~ 0-18.0' CLAY, sandy: few rock fragments (CL) no sample 18.0'-21.8' SANDY GRAVEL and COBBLES (GP) No sample 21.8'-38.0' SHALE: Hardness 5, silty;clayey, ~ligh~ly weathered, beds dip r.orizonta1 to 3 and 0.3 -0.8 thick, fissile to more blocky with depth, few selenite gypsum crystals disseminated, bentonite beds -3" thick at 30.6', 32.2', and 35.2', top 2.0'limon~te-stain~d, charcoal color; hairline joints dip 50 at 35.4 and with slicks at 37.3', few hairlines near vert+cal fractures and with bentonite veinlet at 25.2 , Max. core length; 0.8', average 0.3'; air-slakes along planes of fissility, water-slakes in 5 minutes. 38.0'-52.4' SILTSTONE, shaly Hardness 7, 5-6Iwhere~more shales silty to very fine sandy, shaly 48.5 -50.5" crossb~dded 30_100, beds 0.7'-2.11 thiCK, carbonaceous coating and minute pyrite crystals along bedding planes, many shal y laminae throughout wav y and broken in part, bentonite beds 0.41 thick at 48' and 50.5' J vugs (1/':" x 1/2" long) filled with minute pyrite crystals 38.5 - 39' gray with dark gray banding, charcoal color where mor~ shaly' open joint dip 300 at 49.2', Max. core length 2. I' aver ~ge 0.8'. 52.4'-86.0' SANDSTONE: Hardness 7, fine t~ me~ium grain, sugary, oorous, siliceous, crossbedded 5 -15 , beds o 71-4 0" thick carbonaceous coating and laminae along b~dding planes, ' manr carbonaceous laminae and slightly vuggy (-1/10") 52.4 -64.5' and 70'-80', manr silty laminae broken and wavey reworked with 0.4 silty fault gouge? at 75.1' from 74.5'-76.6', lijlht gray ~o buff w/ dark gray banding; open joint dip 60 ~t 59.5 6,open joint with light yellow coating dip 75 at 64. ,\Iair- line to open fracture vertical at 60.0' Max. core length; 4.0'. average' 1. 5' . 3~29-S0 0-24' SANDY CLAY with LIMESTONE GRAVEL: Not sampled. 24'-38.7' SHALE: Hardness 5-6. Clayey-silty with many limy laminae. Fresh. Platy to poorly fissile, brittle. ::~~~~M~a~~tro~t6~~' ~'~~~~t~;~d ~~~~tl~. diE~a~f ~ith gray banding parallel to bedding. Disseminated very fine pyrite crystals along bedding at 37.6'. Joints dip 400 open. Very slight air-slaking alon~ bedding planes about 0.2 I apart. Max. core length 0.5 , average 0.2'. 38.7' -74. 7' SHALE: Hardness 5', clayey-silty. Fresh, blocky~ brittle. Bedding plane parting 0.5 '-1.5' apart, dip 30. Few limy laminae to 53.0'. Bed of bentonite 63.0'-65'; scattered fossils and few limy laminae below 65.4'. Black with gray pencil line banding. Joints dip 600 open. W,ater-slakes along bedding on about 0.2' spacing after 5 minutes. Max. core length 1.0', average 0.4'. 74.7'-121.4' SHALE: Hardness 5. Silty-clayey. Fresh, blocky to medium bedded. Major bedding plane partings 0.7'-1.8' apart, dip 300. Bentonite beds 0.3'-0.7' thick at 88.6', llL6', and 118.6' 0.4' limr shale at 116.9. Black. Joints d:ip 650, open. At 87.0 joint dips 550 calcite healed w:i:ith slicks and fine pyrite crystals. Water-s'lakes to 11/4" fragments after 5 minutes. Max. core length 1.8'1' average 0.9'. Water level not measured 0-4j9' SI~;ry CLAY; soLI 0-1' ; hard packed 1'-4.9' 4.9 -85.4 SIlAI.E: bad;ly weathered, blue 4.9'-13.5'; black, weathered 13.5'-21.3'; black 21.3'-36.2" hard, blue with softt layers) 36.2'-51.2" hard, biue 51.2 -61.2'; black 61.2'-85.4'. ' 85.4'-91.2' SANDSTONE hard 91.2'-96.2' SANDSTONE"and SHALE' blue shale with layers of sandstone and soft ~ray shale' 96.2' -106.2' SANDSTONE; hard. . PROJ DH 26 EI,4798.5 0' r? r ,~ r J Ii, ,.. 127 I I I I I I I I I I 0-12.0' SlL',TY CLAY, hard packed. 12.0'-12.7' SHALE, blue, oadly weath~ 12.7'-91.0' SANDSTONE (Dakota Im),brown to gray, hard, streaked lwith carbon 60'-91~ W.L, EI.4752,6 ;- 4-3-50 AD,AP TP DH CH LT 4-3-50 W, L El. 47~2~U 1- 4-3-50 Power Auger hole, for size see complete log. Test Pit, for size and method of excavation, see complete log (TP 3071 through 3086 are not shown on Section A-A 1. Dnll hole, for sIze and type of drilling, see complete log. ( DH 500 through 510 are not shown on Section A-A). Churn drill hole, 8" dla. Date exploration completed AP 301 E14872= ,;~ 1751 12- 4-64 PROJ AP 302 E1.4853! 0' V/l 6'W ~ 11~',7:~ 12- 4-64 EXPLANATION Water level, elevation of water surface and date measured (When not indicated or noted water level was not encountered,) Letter symbols in parentheses, following the soil descriptions in the logs, are group sym- bols of the Unified Soil Classification System based on field identification. Copies of Drawing No. 103-D-347, Unified Soil Classification, may be obtained on request to Chief Engineer, Bureau of Reclamation, Denver, Colorado 80225. 4 -3-50 0-3.5' LEAN CLAY. approx. 9070 medium plasticity fines, medium toughness, slow dilatancy, high dry strength. rapid reaction to HCl. Approx. 10% brittle, angular limestone and shale fine sand. A trace of brittle, angular limestone and shale fine gravel. Max. size recovered 3/4", ~ray, dry, and loose. 3.5 ..17.5' SHAlE, weathered. recovered as 3/4", max. size, brittle. flat, and angular fragments. Broken by auger. Slight to medium HCl reaction, Some limestone 16'-17.5'. Shale is dense, moist, black, mottled with yellow 16'-17.5'. Groundup material has characteristics of lean clay. Stopped at 17.5', too hard to auger. 0-.6.0' LEAN CLAY, approx. 85% medium plasticity tines, medium toughness, slow to no dilatancy, high dry strength medium reaction to HCl. Approx. 15% brittle, angular, , shale and limestone fine sand. A trace of brittle angular. shale and limestone fine gravel. Max. si~e recovered 3/4". dark gray. dry, loose. 6.0'-12.3' SHALE, weathered, recovered as 3/411 max. size brittle, angular, fragments. Broken by auger. Slight' HCl reaction. Dense. Black and moist. Groundup material has characteristics of lean clay':" . 12.3'-13.1' LIMESTClNE, no sam~le. A rock bit was used on the auger to obtain the 0.8 penetration into this material. Stopped at l3.:i.:, no further depth desired. PROJ AP 1411 EI. 4800:t o'r~ 4_5' L::..J 9-26-66 0-4.5' LEAN CLAY. Approx. 85% fines of medium to high plasticity, medium to high toughness, no dilatancy, medium to high dry strength. Approx. 15% predoolinantly fine sand. 'A trace of fine gravel (limestone chips). Medium to rapid reaction to Hel. Maximum size 3/4 inch; color - tan; moisture - dry. l:;,-Place Condition - firm, dry, dense, mottled, grass roots top 1. 0 foot. Refusal on sandstone at 4.5 feet. NOTES For location of explorotion, surface geology and additional explanation, see Owgs_ 382-0-800 and BOI. Complete logs 01 exploration holes and test pits follow the geologic drawings in these specif ication ;:~ JOint and bedding plane angles ore measured from a plane normal to the core axis ~ ~ 7720 108 PROJ TP 1117 EL 4863. 91 O'~ry 35'H. i;-'l 12'~ 5- 23-67 0-3.5' SANDY CLAY, about 60% medium plastic fines, limy 40% fine sand, trace of limestone gravel (-1"), platy. more coomon near surface1 few limy streaks and nodules (-1/4") rootlets top Ii"; drr.' firm, dull 2ray_brown; max: size 1" gravel and 6' clods. 3.5Y-12.0' SHALE, silty-clayey, moderately weathered, hardness 5 (can scrape off grains with fingernail), platy 5 bentonite beds (-3"), selenite and few calcite crystals along fracture and joint planes, bentonite coating along bedding planes, few shaly concretions (-4"), top 2.0' dry, lowe~ portion damp, dark gray to blackj breaks up into -3 fragments from backhoe. PROJ AP 303 EL4840! o'r1 0-11.8' SHALE AND LIMESTONE, weathered, recovered as 3/8" 1'---) max. size, angular, brittle, fragments, broken by 11.8,1:_-'":,, auger, some lime concretions and calcite. rapid HCl ~ reaction, dry 0-7.7', moist 7.7'-11.8', gray, tan to 16.s,1i light brown. Groundup material has characteristics of 12-4- 64 11.8 1~a_n16cl5~Y' . SHALE, weathered, recovered as 3/8" max. size, brittle, angular, fragments broken by auger; Some mica. slight HCl reaction; trace of siltstone and limestone; black mottled with yellow silt, Ground-up material has chacteristics of lean clay. Fresh shale 16.2' -16.5 ' Stopped at 16.5', too hard to aug~r. SOIL AND ROCK HARDNESS AS USED IN EXPLANATION AND GEOLOGIC LOGS HARDIlESS 1. Not used. 2. SOFI': ThtDDb can be inserted to knuckle, granular material. crush down completely and easily to individual graina. FIRM: In-place material can be thumb printed when moist. C<>>1PACT: (equals Hard in cohesive soils terminology) Cannot be thumb printed. Beginning of cementation. Granular materials can be crushed in fingers, but may contain cemented aggregates difficult or impossible to cru.h in fingers. Includes clay cemented material, which should be noted. 3. 4. 5, POORLY CEMENTED OR POORLY INDURATED: Does not break down or soften in water. Very difficult, or impossible to crush in fingers, but edges can be scraped or crumbl~d, and grains rubbed off ess ily by hand. CEMENTED OR INDURATED: Grains can be scraped off with fingernail or knife blade. One-half inch hanps can be crushed with pliers, and there is a tendency for material to crush to powder. Nx core in l2-inch lengths can be broken in hands. 6. 7, WELL CEMENTED OR WELL INDURATED: Only lumps smaller than 1/2 inch can be broken in pliers. When crushed there is a distinct tendency to break down to angular chips rather than individual grains. HARD: Can be broken down to grains with a haomer, but does not ring. 8. -~ AUllAYS flUnK SAfETY UNITED STATES DEPARTMENT OF THE INTERIOR BUREAU OF RECLAMATION FRYINGPAN -ARKANSAS PROJECT- COLORADO PUEBLO DAM LOGS OF EXPLORATION SECTION A-A DRAWN_ I::.~_~ _N~_R~ SUBM'mD~~~ , _~:::RO:VM,~7i:;~~--_j TRACED CHECKE Dt S>_.e._ DENVER. COLORADO, JANUARY 20, 1970 ShEET I OF 6 382- 0 - 8 0 2