ML19329E154

App 2D of AR Nuclear 1 PSAR, Geology. Includes Revisions 1-18

ML19329E154
Person / Time
Site:	Arkansas Nuclear
Issue date:	11/24/1967
From:	ARKANSAS POWER & LIGHT CO.
To:
References
NUDOCS 8005300756
Download: ML19329E154 (16)

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APPENDIX 2D GEOLOGY 2.D GEOLOGY 2.D.1 GENERAL GEOLOGY AND STRUCTURE 2.D.2 SITE GEOLOGY 2.D.2.1 GE0 LOGIC INVESTIGATION 2.D.2.2 FOUNDATION MATERIALS TESTING 2.D.2.2.1 Bedrock Samples 2.D.2.2.2 Soil Samples 2.D.2.3 GEOPHYSICAL SURVEY 2.D.3 SITE FOUNDATION EVALUATION 2.D.3.1 BEDROCK FOUNDATION 2.D.4 GEOLOGY SUPPIa1 HIT 6

2.D.4.1 GEIEPX 2.D.h.2 SITE EXPLORATION 2.D.4.3 SITE EVALUATIOU g 0267 7-u-66 Supplement No. 6 2D-1

2.D GEOLOGY 2.D.1 GENERAL GEOLOGY AND STRUCTURE The site is located about 1-1/2 miles south of Interstate Highway 40 and two miles southeast of the small town of London. Normal pool elevation (338 FEL) of the Corps of Engineer's Dardanelle Reservoir reaches within about 1,200 feet horizontally from the site.

Geologically this area is characterized by gentle east-west trending anticlines and synclines typical of the Arkansas Valley Section of the Ouachita Physiographic Province. The mapped geologic structures, which extend from about three miles north to three miles south of the site are as follows: London anticline, Scranton syncline, and the Prairie View anticline. These features are shown on Plate 2Dl. The plant site is located on the Scranton syncline in which the maximum dip rarely exceeds 10 degrees except locally where contorted beds may dip as steeply as 20 degrees.

Bedrock of the area is sandstone and shales of Pennsylvanian age which are overlain in places by stiff clay or silty clay which has been eroded from higher elevation bedrock exposures.

Several faults have been mapped west and northwest of the site. The Prairie View Fault is concealed under alluvium some 6 miles west of the site. This feature is well exposed about another 6 miles west and is a high angle east-west trending and north dipping normal fault with the downthrown block on the north side.

The London Fault and accompanying small branch f ault trends east-west about 5 miles north of the site. It is a high angle south dipping normal fault with the downthrown block on the south side. Best exposures of this fault are about 8 miles northwest of the site. At this locality, the fault plane dips 58 degrees south and has an apparent displacement of about 20 feet. An unnamed east-west trending fault lies about one mile south of the London Fault. The trend of this fault changes toward the east to generally northwest-southeast and appears to intersect the London Fault in the vicinity of the north fork of Mill Creek. The locations of other faults are presented on Plate 2El, Appendix 2E.

2.D.2 SITE GEOLOGY

2. D . 2.1 GEOLOGIC INVESTIGATION Five diamond core holes totalling 455 feet and 26 auger holes totalling 428 feet were drilled in the plant site and surrounding area. The core holes were drilled in the area proposed for the containment vessel and turbine building. The auger holes were drilled along several cooling j water intake and outlet canal routes. Representative samples from the core ,

holes were tested and the results are presented in the following section. l Refer to Plate 2D2 for the location of these exploratory holes and to Plate '

2D3 for summarized logs of the core holes.

2D-2 ozw l

\w The site is underlain by hard and dense, black, horizontally bedded shale of the McAlester formation. This shale was encountered beneath 13 to 23 fret of stiff clay and silty clay in the area of the proposed main structures.

The deepest drill hole penetrated very hard fine-grained sandstone, apparently of the Hartshorne formation, at a depth of 149 feet. This sandstone crops out near lake level about 3200 feet east of the drill hole. Results from the comprehensive program of auger holes drilled to bedrock indicate that the bedrock surface has low relief and slopes gently to the southwest.

The shale is only moderately jointed and most of the joints are tight. The joints occur both along horizontal bedding planes and at angles ranging from 40 degrees to near vertical. Drill water circulation was lost in the deep hole (DH-1) only when the sandstone was penetrated at about 150 feet.

Drilling water return was nearly 100 percent in the other core holes which is indicative of the permeability of the shale.

The exploratory program included 11 wash-bore holes through the lake bottom materials to bedrock. These holes were located in the Dardanelle Reservoir The reservoir at two possible canal intake areas, as shown on Plate 2D2.

has been in existence only a few years and natural deposits of lake sedi-ments are rare in the area explored, therefore, the lake bottom has a soil cover and thickness similar to that on land. Generally, the thickness of this material is greater in the northern arm as indicated in wash-bore holes 1 through 6. The average thickness is about 17 feet and the bedrock surface elevations ranged between 299 and 316. In the south arm wash-bore holes 7 through 10 encountered thinner clay soil, and the bedrock surface elevations ranged between 313 and 321. Holes 11 through 13, located in the proposedThe outlet area, indicate thin lake bottom material overlying bedrock.

character of the bedrock beneath the reservoir arms is probably similar to that encountered in holes DH-1 through DH-5.

2.D.2.2 FOUNDATION MATERIALS TESTING 2.D.2.2.1 Bedrock Samples Nineteen samples from core holes DH-2 and DH-5 were tested in the Bechtel Geology Laboratory, San Francisco. Standard test procedures were used in these physical property determinations. A detailed laboratory report is on file in the Production Department, General Office, Arkansas Power and Light Company. The following table (1) lists the high, low, and average values for the tests performed.

2.D.2.2.2 Soil Samoles Thirteen 3-inch diameter Shelby tube samples were taken in the area surrounding the major, heavier units of the plant. Although the major units will be founded on bedrock, lighter structures will be supported on soil in the general site area. The soils found in these three holes (DH-1A, 3A and 5) are probably typical of what will be found in the surrounding area. After the total plant layout is completed, additional borings may be required in the areas of the auxiliary buildings to con-firm that the soils are similar throughout the area.

0269 W 2D-3

t-TABLE 1 Data from DH-2: 38.5-46.5 ft.

Data from DH-5: 28.9-38.0 ft.

NO. OF RESULTS TEST TESTS High Low Average l'

A. Specific Gravity 10 2.59 2.53 2.57 B. Porosity 10 8.0% 5.5% 5.8%

C. Absorption 10 3.1% 2.1% 2.4%

j D. Unconfined 9 3740 psi 3140 psi 3470 psi l Compression i

E. Modulus of Elasticity 6 6 6

1. At 100 psi 9 0.5x10 psi 0.1x10 psi 0.3x10 psi

• 2. Between 100- 9 1.0x10 psi 0.7x10 psi 6 0.8x10 psi 200 psi F. Poisson's Ratio i

1. At 100 psi 4 0.26 0.11 0.20

• 2. Between 100- 4 0.26 0.10 0.18 200 psi G. Triaxial l Compression i

(two suites of Suite I DH-2 @ 45 & DH-5 @ 30-37 ft.:

five samples 9 - 42' & C - 775 psi, each)

, Suite II DH-5 @ 28-36 ft.: 0 = 37' & C = 890

! Psi

• Due to the small tension fractures that developed in the core samples upon removal from their environment at depth, the loading was increased from 100 to 200 psi to-yield results more representative of the rock properties. It is suggested these values (both for Modulus of Elasticity and Poisson's Ratio) be used in design as a more realistic evaluation of the rock strength.

2D-4 0<?90

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The testing program utilized standard ASTM procedures except for the con-solidation tests which were specified to be performed for values relative to anticipated Icading with approximate safety factors. A detailed soil test report has been prepared by Grubbs Consulting Engineers, Inc. ,

Little Rock, Arkansas, and is available in the Production Department, General Office, Arkansas Power and Light Company.

2.D.2.3 GEOPilYSICAL SURVEY Approximately 7500 feet of seismic refraction surveying was performed on and near the site. Refer to Plates 2D5 and 2D6 for location and profiles, respectively, of the seismic lines. In general, the seismic determination of bedrock elevation coincides well with the depths to bedrock determined by auger drilling. The profiles extended the bedrock configuration beyond that determined by drilling and confirmed that bedrock relief is slight with a general slope to the southwest.

Seismic velocities in bedrock ranged between 10,000 and 14,500 feet per second, indicating hard, dense bedrock that may require blasting to excavate.

2.D.3 SITE FOUNDATION EVALUATION 2.0.3.1 BEDROCK FOUNDATION The foundation for the critical structures will be the underlying Pennsyl-vanian McAlester formation shale. The properties of this material are summarized as follows.

/

Average Values

1. Specific Gravity 2.57

2. Porosity 5.8%

3. Absorption 2.5%

4. Unconfined Compression 34706 Psi

5. Modulus of Elasticity 0.8 x 10 psi

6. Poisson's Ratio 0.18

7. Triaxial Compression 0 = 40*; C = 830 psi From the above data it is apparent that no foundation problems should be anticipated. In addition, it should be noted that the seismic velocity of the bedrock sequence, as shown on Plate 2D6, varies from 10,000 to 14,500 feet per second. These values are indicative of the dense nature of the foundation material.

The drill logs indicate that from 2 to 5 feet of weathered snale will probably have to be stripped from the bedrock surface to produce a satis-factory foundation. In addition the behavoir of the core samples indicates that the fresh shale foundation material will have a tendency to expand slightly upon removal of the overburden and weathered shale zone. Because of this factor the excavation of the foundation to final grade should be postponed until immediately before concrete placement.

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, 2D 5 b__

I 22.D.4 GEOLOGY SUPPLD4ENT-2'.D.4.1 GENERAL'

[6

Since the submission of Arkansas. Power and Light's original Preliminary I l- - Safety Analysis Report for the Russellville Nuclear Unit, additional foun- I dation drilling was conducted at the site during February and March, 1968.

,  ; The purpose of this exploration was to:further define the foundation con-l :ditions-directly-under the reactor and turbine buildings and provide j . foundation information for final design. The structures were relocated slightly-south of the first investigation program. Plate 2.D.7 shows the i location of this new~ vork.

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j. 2.D.4.2 SITE EXPLORATION j Eighty-six undisturbed samples of clay overburden were obtained from 18 holes and 303 feet of bedrock core samples were obtained from eight holes. (

The additional drilling totalled 743 feet. Two Casagrande type piezemeters ,

were installed in Holes P-123 and P-124 (see Plate 2.D.7) to determine the j overburden ground water level. Approximately 20 feet of rock core was sent i -

to the Bechtel GeolcEy Laboratory for strength and modulus of elasticity I determinations.

2.D.4'.3 SITE EVALUATION I The information obtained during this additional drilling further confirmed '

the site evaluation presented in the PSAR. More specific soils data in ,

l reference to swelling characteristics was cbtained and are presented in a '

l report frem Grubbs Consulting Engineers, Inc. of Little Rock available in l the Production Department, General Office, Arkansas Power and Light Ccmpany.  !

{ . . ,

l A more detailed sampling and testing of the weathered, clayey overburden i l- was conducted. Numerous auger holes were drilled to determine the thickness  !

i and physical characteristics of this material. Surface and bedrock eleva-l tions are shown on-Plate 2.D.7  ;

The overburden thickness ranges between 13 feet snd 24 feet and consists of-i red, stiff, plastic clay with occasional zones of silty clay and isolated

• l - small pebbles. - No casing was needed except where holes were later used for

l. bedrock coring.

. Bedrock under the reactor and turbine buildings is the same as previously encountered,'however, a more accurate determination of the location of '

suitable foundation and the physical characteristics of this material was

- completed.- Graphic logs of the core appear on Plate 2.D.8. i Laboratory test .results of the core ' fell within the range of the previous

testing. - The results are presented in Table 1. I J

2D-6 - -

7 11-68 g s - ; Supplement No. 6 0272

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TABLI 1 6

Data from Core Hole D-120: 30.0'-62.0' Data frca Core Hole D-121: 25 0'-51.0' NO. OF RESULTS TEST TESTS High Lov Average A. Unconfined Compression 17 4630 psi 2940 psi 3800 psi

3. Modulus of Elasticity 9 1.08xlOb psi .25x10 psi .6hx10 psi The two pienemeters indicate that the water levels within the clay over-burden correspond to the mean water level of the Dardanelle Reservoir.

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NOTE: Geology is from the following two sources -

1. Geology of Delowore Quodrongle and vicinity Info. Circular 20-A of ARKANSAS POWER S UGHT CO.

Arkansas Geological Commission, 1961 Merewether and Haley.

2. Geologic Mop of Russellville West GENERALIZED GEOLOGIC MAP Quodrongle, by Boyd R. Holey, U.S.

Geological Survey, prepared in coop- .. _. . j erofion with Arkansas Geological Commisson. 6600 PLATE 201 0'A.GY E -

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353 Surfoco elevotion

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374 AUGER HOLE DATA k nose sea, smreene EL emmena ts. Mass saa seresse Et emmemn EL 327'

_ I 338' 365' 14 352 34Cr 31F IS 383' 3GP 2

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2 ory) 9 3S3' 336' 22 353' 332'

,0 353' 338' 23 347 326'

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's (Topogrophy reproduced from U.S.tli 7.5 minute k qff .

Russellville West, Ark. mop sheet.)

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353 0 DH-lA f CNERBURDEN: 0 20', Reddsh I

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__/ _ SHALE 20*-149 0' Grey-block, m y 20 .

_= -Z hard and enossia.encap for NOTES,

=__ weathered and broken rone 30 .=: -

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between 20.O'- 22.5' Horuontot bedding but sil-defend W Hole dribed for undisturbed seWes ed piezametnc installotion onty

.=._ r i due to enosseve nature of (b) Unesturbed(Shelby) sorrWes 2.0,-

9'T . formation. 3. O' 4. 5'- 5.5' 7.0*- 8 Q* 8

-2 Occasional sondy rorms. No 9 T- 10.5' 40-1 . =. _; jointerg Averoge lenph of core

'- : :.= is 10*with 2 unbroken lenphe 3_23 - - -

over 481 50 -E-Z-- E Core brooks along horuortal

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_ ,_7 ff OVERBURDEN: 17.5', Reddish r-- / brown. stiff clay and silty clay.

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pShole frogrnents at (7 o' M SANDSTONE AND SHALE:

}- - 4~ Interbedded (1/2") fine grarned

" 7_]=- sandstone and shoie m 20 / SH AL E' 17 5,- 74 5,, Massive black, socLhg CCC f

m-r t horumtal bedding Very hard Few l EQ C_ _- joints cheefh along bedding,but occessoru

~t C'CC 60*ond 40' Sorne slichensides on so- [-E NOTES 3o CCE 15*)oints psio= 64' depth. Average core 4 (o) wash bore to 22.5' E C -- IoYcorks. bne keYe oYore'53Y

,._ yg (b) Coning set of 25.O' r_C_,_: long with no brooks.

32Q-pg (c) ICO% acter return down eo_?5 .

_.A r to 14%O =.T r (d) Amuge core rscovery

- - - -__]_ for entire hole . 98%

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iss Very hed and obrasive, fine 2e3 us rrr ese groined, gray.

NOTES Nurnerous joints.Co'npiete drill water loss' (0) Wo h bore and rock tut to 22.0* i (b) Rocktoo weathered locore frorn 175' to 22.O'.

(c) Average core recovery for entire hole = 97%

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3S4 0 DH-3 r/ OVERBUROLPC 0-H Q Brown as2 o D H-S OVERBURDEN: 0-23.Q Brown

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/ cte one sin , cloy weas hored roc of 14- [ setti cioy erid seltyclay,tten scruf lenne so _ to - L 3*O

.= SHALE: 14- O*- 75 7,' Bbck, CCC teriaorval beerq.Crodks when n4 to_=2 -1 --~

dry. Chefly prried obng bedding na 20. /

pbnes wth occongrool 60" frochsres 7j

-Z- .~ ~ 329 -

- - - sHA weathered E_~-. E Average corp lon@h 8' wth the 'Z =- top 2(E. 210*-75.0,*

with cloy seans. Fkm of

= , = = longest 21.

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, Cracks when dry Average core length

= - - -_ - _ hf with longest 25' Occomonal Z -E -_. -, pgged verticos joints.

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_Z-  :~---- Gol Cosnig set of 23.5*

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(td Undistwbed (Sheby) sol samirs or

-]- -E 12 5' 13 O' 15 5'- 16 0,',18 Ok,18 5, 7o.-] (a) woeh bare and rKk bit to 70 -E E- 20 O*- 20 5, B 20.5 - 21 O g=j set cos4ng of 16.r. F_q (c) Average core recovery = 97%

203 M7 (b) Aarogs core recovery for 384 0 DH-3 A

// OVERBURDEE O- 12', Ton to gray cloy QCCossorial grovel bebw 8 0, NOTES

'o - / (a) Hole driled for undetsbed til sergdps 342 "

ROCK (b) tridaturbed(Sheltgr) somi 2.y -

3-Q' 4.5'- 5.5*, 7. O*- 8 0,pe at 1 5'- 10.5 E X PL ANATION DH-4 353 o y/ QvERBURDE4 0-19,* Brown

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ELEVATeoss FEET so _ ./

D E PTM- F E ET# O 34 2_ P* *'* * **

}3s 20:2.,_ : _ SMALE 19.O'- 75.O*, From 19 O'- Ieee 24 d weattered Wiole with cby seam 3e3 to C~---'--- Ed ocCoseflol turtl tones

=C From 24-O' to boriorn typkd harts 30- - - -

bbth, dense rock.

Heizontal joints wth occasional Z .~_'.'.E

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NOTES

,, r _ d- (a) Rock bit. 19- 24 -O' to 5 3- * ' *E)ry 00%

(b) Core r ARKANSAS POWER 8 LIGHT CO.

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SUMMARY

OF DRILL HOLE LOGS'S 27e 7s 5_". - DH-1 THRU DH-5 6600 PL ATE 203 l 0279 '

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6 z A' clay a silty clay = site overburden ]

s400] Reservoir 4 -

,/ .4 pp.-am m ggy-w w.:yg g w 00 Bedrock: St w o-SECTION SHOWN IN @

A' 380 -

Projected 250' @l NW 360 - g7 Dordonelle Reservo.ir 4 y Normal Pool Elevation v Ground surface 1

1 3 4 O '- 7 _-

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Cloy 8 silly clay Z

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_J EXPLANATION DH-1 A Core hole #

/,/ l W I @ Sampled 2-. 7pk Probable top j

300 - water well [ D'd' ""

A g Measured _ _f' water well 280 -

500 0 500 l 260 - HORIZONTAL 2

VERTICAL %

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-200 ale a sandstone

-- O LME VERTICAL 8 HORIZ. SCALE SA A Road

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SITE AREA d DH-IA Piezometer (dry) Bedrock . - 380 under thin soil cover ,-

DH-IA AH-5 AH-7 (Dry) /

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/ - 360

{(Dry) , , , ,

-resse, gdi'M

/ - 340 oc

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1. " / / - 320 REFERENCE gs d PLATE I -- location of profile.

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Dept h, 155'

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. 1000 1500 ARKANSAS POWER 8 LIGHT CO.

SCALE GEOLOGIC SECTION A'- A SHOWING PIEZOMETRIC SURFACE 40 6o THRouGH SITE AREA see m.. o m wine m.. new PALE 6600 PLATE 2D4 3 0281.

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18 _ _____ _ _ _ _ _ _ _ _ _ _ _ _ _

y2 i 17 -

l Line 'F' 4 7 l g Line 'A'

'l 3 6 L5 l Center of P I l Site (DH-1)

( ,

5 '2

'314 Line 'E' 315 916 N.

/. N

[ -)x -

\

/

[- -._ A - s

.3 g

's 3

l O .5 SCALE OILS 2

{

! k

I i

l N l

l '

I i

--_.__g{ip_ ek l 1/

I

/

( l' le 'B'  !

\  ! /i 310 ,, ,, l $ A&q 39 si . -

' 8 .

y -- ---gr---  :>9 L Line 'D' l j 38 l l

I I

REFERENCE '

(+ From Boyles Bros. Drilling I Co. Report, PLATE I.

./

3 44 l l

15 SGismic Line g l4 "

and Shot Points ARKANSAS POWER 8 LIGHT CO.

I MILE: LOC ATIO N MAP LON DON SITE SEISMIC SURVEY 400 ho D81&estG eeO MW 6600 PLATE 2D5 M 0283

E l

I I  !

I p SE -3 4

SP-4 SP-3 S P'- l i  :

9 e

V, : 1,000 - 1,200 340- r v7 ,yyyr rrrrrrrr ww w y r r y *

• T 'r' v r r v 7.,..,..,- , r r r v r r r rv YT v, : 11,000 - 13,000 320 LINE A 7

^ 4:

360J 'O w'

z SP-5 o _

SP'_l SP-6 -

g- t F v, : :,000 - 1,2c 3 4  !

> 340-

.y-r ~f" T T T T7 7 7 7 7 7 7 'P 7 "Y r y- r- r- y r- y- ,- ,. y- y- r- 7. f. , y-r r T7 T T #

V2 : 10,000 - 13,000 to F

< 320 1 LINE B X

O x

Q- >E 3

h SP-13 350--

S P-12 S P- 9 l- -

V, = 1,200-1,800

. ,.y y -r T r r T 'T'T 7 Y > > r. ,. y .y. r Y 'TT**" *'7 Y Y r r .,.

320- Vz = 12,000- 14,500 LINE D 20 o 20 e Vertical Scale 200 o 200 40 Horizontal Scale bk-04h

' 1 l l i

SP-lO S P- 8 360 .S SP-2 p9 I--

T r ,- ,. ,. , V, = 1,600 - 2,500 340- #

try Twr>> r- r r r r v v v r f T -r T V, = 11,000- 13,500 320 LINE C S P_- 14 S S P - 15 S R P- 16 i~

340- ~ ^

v, = 1,100-1,200

• T T r r T r- ,..,.'r v ryT T T T r r y y r r r y v v v v r r ,-

320-rrr V2 =11,000 LINE E S P- 18

r SE 340- -

-w 330- v, = i,3M - ' 8 r r r v v r r r y r r r r ? .,. ,. ?.7 y -r < r v r 7

• y#.,.#, r SP-Il v2= 11,000- 12,000 REFERENCE

' > y- From Boyles Bros.

Drilling Co. Report, PLATE 2.

,p , ARKANSAS POWER S LIGHT C Co.

) p,,, SEISMIC PROFILES JOB NO DeaweeeG ho aty 6600 PLATE 206 gf[

M i

/

\

- o 8 {:

s a e N Q *

. 3,3 q x sss. coo 4 5 6

\g 7

\g 9 A-lO4 9 A-lO3 '

e A-lO6 l; }

-j

~

P_-123 ,

9 A-lO6 9'A-lO5 g 77 AOl AD-IISO J dleiin'?i" O AD-IIEl8 9 ^-'07M-109 9/

~ " - '

Igi ,

A-lOl n3s7,000 y 0

-; / G"7f c ,se yQ.y n>

,,,,, - c , neseavvin

%p W &h oess k -

! N\,f

i E X PL A N ATIO N

! k O Soit sample hole

(

< - O Soti compie one core hoi.

i d Core hole E Pierometer N 338,803 66 E 4,633,002.77 T AUGER HOLE DATA Hole No. Surfoce Elevation Bedrock Elevation A - 10 8 341.9 324.9

-a-=~ _x-a_,

A - 102 352.2 329.7 l A - 10 3 35L5 333.5

,1 A - 10 4 352.9 335.4 A - 805 352.4 333.4 A -lO6 352.5 334.8 A -lO7 352.6 335.9 A - 10 8 352.8 334.3 A - 10 9 353.5 337.5 A-llO 353.4 340.4 A-Ill 347.7 334.2 l" 338.9 A-Il2 353.9 A-Il3 354.3 330.3 A - 114 353.7 329.7 AD -115 352.2 332.2 AO - 116 352.4 331.4 O A-125 " AD - 117 353.1 335.1 AD - f l 8 353.3 338.8 AD - 119 350.0 333.0

& - S E COR4EX Or$rCTEWEB

/ E 1 1 63 J 1 1 1 1 3 1 i i D - 120 352.5 329.0 1 1 L-r- 1 1 1

-izi 352.6 334.6

(') d- il3 O A-Il4 C AD-Il9 D - 122 352.7 334.7 1 t 1 , 1 1 , ,

1 1 1 1 1 1 1 P - 823 352.5 334.8 P-824 352.8 334.3 A -825 353.0 326.0 200 0 200-- - - - '400 600 F m -- -- . _ _ _ . . _ SCALE ARKANSAS POWER S LIGHT CO.

g LOCATION OF DRILL HOL8 SECOND STAGE 0287 -- --- ' -

6600 PLATE 2D7 l

l ,

~ ,- . -- e --

t AD - 116 AD - 117 AD - 115 353.8 0 352.4 O O - 21.51 OVERBURDEN, plastic red to son 352.2 O

/[

O - 20.O* OVERBURDEN, very plostic reddish ton clay. cla y. [

10-80 - 10-335.1 ..

20.O* - 60.O's SHALE, block, horizontalt 20- ,, j 20- wc _

332.2 20- 3 f,, 33 g,4 2L5'- 68 01 SH ALE, block, dense, horizontally 31!.a v.,V bedded. Weathered and broken 'O O' to 2E.O*. w-w %y bedded. Weathered and broken 21.5'to 26 O'. C-~~

Few joints chiefly parallel to bedding. _._,..-

f s -,

Average core length below weathered zone ._"~~C Few jomts chiefly parallel to beddmg but r_7

-WI occasional 60 degree fracture present. Average 30-_m;- -

CCC IO* to 45 . 30-___,,,- - . core tength I2* but becomes shorter of ter 30 -- , . - , - - _ 2-" drying. -_

C.C _____

40 ~- -- 2 40 ~- :~

=:

40-

.=_.

~_~.

~.:"

'~ .~- :

~_~_.

~_

.- - " - - ~ ~

- - - =.-"_.-

- 50-[- ,,-. f 50- ,_ _-.-

50-'- _-:-7 _.

~~ -

Z-

_~ ~ ~

. - - 295.1 58

- - - - - 60 -

C. -

272.2 e

60 291.4 68 D - 120 D - 121 AD-119 352.6 0 -

352.5 0 o . 23 5; OVERBURDEN, red to ton plostic clay.

350.0 0 9 4" g. , o .17.01 OVERBURDEN, red cloy with about /

" -- 2.5'of road f.it on top.

10 -

10- 10-170*-40.01 SHALE, block, very hard wit:. thin 334 6 -,

3330 _- 2 20- 20-FE sandstone streaks. weathered 17.O' to 22.O'. _Q' 20 .h'.:=f~d. Joints closely spaced 3*- 6* parallel to 3290

/ 23 5'-63 51 SH ALE, dense, block, horizontal,1y C"2 Tg _.- hjri ontal bedding Average length of core

_u f '-

C

;- -

:; c(;- bedded. weathered and broken 23 5' to 28 O. "'--

.-.-_--- Few joints parallel to beddmp, expansion type. 30-.

___- 30-r.,, _ Cores well. overage length t7 but breaks to .-

30 _ Z, _ -

smaller length when dry. _""'_""'-

.,-,;----- __ l. -"._-

' .' -C

-- '-M _.~ Z' 40- _ _ _

31O.O 40 40-.___----

mb_

---Mu NW

-p.

50- 50 - [ .- ~-

_ ___3_._

gm g__.e w M_h4 M

MM-NWN-M

~ ~

60- _ _ -

289.0 63.5 OO OPv r

• f%4 M

l

\

l

_?

i AD - 118

• )- 88 C'. OVERBURDEN, plostic ton to 353.3 0-- 0 - 34.S*. OVERBURDrN. tonen, paast* chat reddish cry 10-338.8 -

14.S'- 55.0". SHALf' bloctt, emanassive Woothered ond

'/?\7 18 O'- S8 O*. SHALE block, dense. Weathered ond br; ten 820' to 23 O's core loss here. 20-DX ;r;- broken of 64.S' to 23 O*. core se noss here Rock below very competen

./J ; lengths of 48,t.andI59

e. Howev,ver 2 ore tunens produced jo.nts oevelop unbroken etter Rock below hos few joints, chiefly parallel to horstontil bedding. Average core lengths iz a - 13*.

(- - .- rock dries chiefly parollel to se horizontol bedding.

--= , , . - _

_.=_ _

30 - : =. .

.=--

= - - .

~-

40 :_ _i

_ _. m

'_ =____ _

50 -

Q~r_

~_'~~

EXPLAN ATION 2983 SS DH NO.

(ELEVATION, FI) 3c.3SO.O O (DEPTH. 4. FT.) I O - -*-- GRAPHIC LOG 33530.0 20 l

D - 122 1 0 - 18 O*. OVERBURDEN. red to ton clay. 352.7 O O - 18.O' OVERBURDEN. reced to con to yellow pkastic clay.

, Occ:smal pebbie and shghtly sandy zone. Occasional sandy clay senses. -.

, PmstH;.

l 10 -

18 O'- S8 O' SHALE block, dense. horizontolly 3347 bedded. weathered and broken i8 O' to 23.O*.

d-s 20- NN

b 18 O -' 58 O*. SHALE, block. k. hard, hoeirontally boddeo.

weathered and broken 88O' to to 28.0". Generally snessive Few Fints chefly parollel to bedding planes with few jomts parollel to beendding. Ceres well.

Cori lengths overage IO* but break to 1*- 3" occasional piece over 24"lonong. Average 14* but

e. hen dry. 2__]. ._-c _]breaks to smaller peces whomen dry.

30-h_ . _~.

.a

- T._~~~.mm

. ~-.~._*

40-F, E.,_ -

m6

~

_ _r_ _."

50

- 1_  :

~~

. =.._

294.7 58 ARKANSAS POWER 8 LIGHT CO.

g GGRAPHIC LOGS OF DRILL HOLES SECOND STAGE 0289 -- --- -

6600 PLATE 2D8 l