ML19320A577
| ML19320A577 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 06/27/1980 |
| From: | Barneich J, Brogan G WOODWARD-CLYDE CONSULTANTS, INC. |
| To: | |
| Shared Package | |
| ML13308B727 | List: |
| References | |
| 41299I, NUDOCS 8007010364 | |
| Download: ML19320A577 (47) | |
Text
{{#Wiki_filter:Woodward Clyde Consultants i l l l PRELIMINARY REPORT ON GEOLOGIC DRILLING AND INVESTIGATION SONGS UNITS 2 AND 3 SAN ONOFRE, CALIFORNIA 4 l l 4 G emner w,u m
Y h 4000 We:t Chapmin Avenue h @ Post Office Box 1149 orange. Cahfornia 92668 (714) 634-4440 Telex 68-3420 B June 27, 1980 Project No. 41299I J Southern California Edison P.O. Box 800 Rosemead, California 91770 Attention: Mr. Gene Hawkins } Gentlemen:
Subject:
PRELIMINARY REPORT ON GEOLOGIC DRILLING AND INVESTIGATION } SONGS UNITS 2 AND 3 SAN ONOFRE, CALIFORNIA We have completed the drilling operation onshore (north of the Cristianitos Fault). These assignments were conducted under the direction of Messers 11 . G. Hawkins and J. L. McNey of } Southern California Edison. This report provides the drilling logs and a preliminary report on the operations. Additional interpretation will be done as needed. We hope that this preliminary report meets the project needs at this time. If you have any questions, please call at your convenience.
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] Very truly yours, John A. Ba rne ich George E. Brogan Associate Associate JAB /GEB Enclosures J Consulting Engineers. Geologists and Environmental Sceentists Othces in other Pnncipal Cities
Woodward.Clyde Consultants
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TABLE OF CONTENTS Page oJ Letter of Transmittal . . . . . . . . . . ....... 1 1.0 Introduction . . . . . . . . . . . . ....... 1 D 2.0 Project Organization and Staf fing . ....... 2 3.0 Onshore Drilling . . . . . . . . . . ....... 2 3.1 Field Operations . . . . . . . . .. .... 2 C) 3.2 Summary of Boring Logs . . . . ....... 3 Appendix A: Logs of Borings O Appendix B: Geophysical Logs O O
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i Woodward.Clyde Consultants 1.0 Introduction ) Two onshore borings were drilled about 500 ft north of the Cristianitos Fault at El Camino Real Road. The locations of borings are shown on Figure 1. This program was conducted under the direction of Southern California Edison. Geologic interpretations are to be made by Southern California Edison after they are provided with the results of the borings. The purpose of this report is to present the logs of borings and to provide a brief description of the operations. Additional operational details are being kept on file by Woodward-Clyde l Consultants. l 2.0 . _ Project Organization and Staffing ) The program was conducted under the direction of M isers. l H. G. Hawkins and J. L. McNey of Southern California Edison. Messers. .J. A. Barneich and O. S. Ghuman from Wcodward-Clyde ) I Consultants coordinated and supervised the effort. The drilling contractor for the onshore boring was Continen-tal' Drilling-U.S. from Madera, Califo rnia. Mud engineering ) and_ supplies were obtained from Baroid and the geophysical logging was-done by Welenco from Bakersfield, California. The boring logs were kept by staff geologists.
~3.0 Onshore Drilling
, 3.1 Field Operations i l The onshore borings were drilled using a Longyear 44 drill l rig with HQ sine drill pipe. The borings were advanced using the - rotary drilling method to depth at which coring was i desired. Continuous wire line coring was then attempted
.using a' 5 or 10 ft-Longyear core barrel. Mud, as engineered by Baroid, was used as ' the circulating flu id . Core diameter j was 3-1/2-inches.
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L. y c -J lC Boring B-1 Boring _.B-1 was started on 22 May 1980. The boring was located about 500 ft north of the projected trace of the Cristianitos L; Fault at its intersection with El Camino Real Road. After
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drilling into the San Mateo Formation, a 4-inch diameter casing was installed to a depth of 58 ft. Attempts were made to ob-tain cores of the San Mateo sand; but most were unsuccessful. O It was decided to attempt further coring in the siltstone of the Monterey Fo rmation. Cores were obtained from 480 to 557 ft. O I When the boring had advanced to 557 ft it was decided to ad-vance the casing to improve the drilling rate. During this operation about 100 ft of casing dropped into the hole. g Repeated attempts to recover the casing were unsuccessful, ! and the boring was abandoned for later closure. Boring B-2 O Boring B-2 is located about 30 ft south of Boring B-1 along El i Camino Real Road. It was started on 5 June 1980. The boring was advanced rapidly to about 400 ft using a roller tricone bit, and 4-inch-diameter casing was installed to 379 ft. Con-Q- tinuous wireline coring was done from about 483 to 750 ft. The boring was completed cn 15 June 1980 at a depth of 750 f t. An l attempt-was made to remove the casing following completion of the hoie, but only 15 ft was retrieved. O Geophysical logs'were run in Boring B-2 after drilling was completed. The runs included an electrical log giving the spontaneous potential and resistivity and a radioactivity log O provided gamma ray and neutron logs. m ,n]
9 Woodward.Clyde Consultants O After the drilling operations, the mud was weighted and the viscosity increased for closure. Both Borings B-1 and B-2 i were then capped with a 1-sack cement-slurry plug. About 1 9 cu.yd. was placed in each boring. The logs of the borings are presented in Appendix A and the geophysical logs in Appendix B. 3.2 Summary of Boring logs. The following is a summary of the stratigraphy obtained from the borings and preliminary interpretation of the geophysical logs: 0 to 48 ft - Terrace Deposits - Sand, colors range from pale brown (5YR5/2) to yellowish brown (10YR5/4) to red brown q (10RS/4), fine to coarse grained, subrounded to well rounded, moderately to well sorted, occasional clay and silt, occa-sional gravel and cobbles, poorly to moderately consolidated. n 48 to 428 ft - San Mateo Formation - Sandstone, in Boring B-1 from 48 ft to approximately 200 ft the color is shades of yellowish brown, ranging from dusky yellow (5Y6/4) to pale yellowish brown (10YR6/2) to dark yellowish brown (lOYR4/2). g From 200 to 432 ft the colors are shades of olive gray, mostly light olive gray (5YR5/2). Bo ring B-2, on the other hand, is almost completely shades of olive gray, again mostly light olive gray (5 YRS /2). Mostly medium to coarse grained with some fine grained sands, .subangular to moderately well rounded. Quartz averages 85-90%, feldspars 5-7%, other minerals 5%. Occasional pebbles and cobbles. Slightly silty and micaceous in some places. Massive to thickly bedded. J
) Woodward.Clyde Consultanta
; The sampling operation was carried out from the vessel M/V Calcasieu supplied by Ocean Services Inc. , Long Beach.
D 428 to 669 ft - Monterey Formation - Siltstone, generally olive black (5Y2/1) micaceous, thin 1/4-in. bluish gray beds are common, highly fractured, slickensided, contorted areas 3 throughou t the formation, bedding varies from horizontal to as much as 70 ft, friable to well indurated, occasional sandy beds. Foram samples from 485 to 495 ft yield age of Lower Mohnian (Upper Miocene). Foram samples from 654 ft yield age 3 of Louisiana (Middle Miocene). Basal unit from 658 to 669 ft contains abundant blueschist fragments and appears to be reworked San Onofre Beach. O 669' to 749.5' - San Onofre Breccia - Medium bluish gray (5B5/1) clay and silty matrix with some sand, moderate to well cemented, clasts range in size from sand size to 4-in. plus, larger clasts mostly chlorite and glaucophane shist, 3 smaller clasts os quartzite and amphibole, clasts are angu-lar, becomes more indurated with depth. O 3-LD l l
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O Location of soring' ; i L ,) ~' s i 6 4 WOODWARD-CLYDE CONSULTANTS j .- n J 0 1000 3000 / Y i O
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O Woodward Clyde Consultants O l O Appendix A Lo9s of Borings O O i O O i lO
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J Project N2. 412991 FI;ld Log cf Boring No. %1 Sheet 1 of 30 lBOHING LOCATION El CarninO Real, ht Side ? ELEVATION AND DATUM ATE FINISHED DRILLING AGENCY Continental Drilling l DHILLER DATE STARTED 22MO DRILLING EOulPMENT COMPLETION DEPTH ROCK DEPTH hWear 44 O DIS T. ICORE SIZE AND TYPE OF CASING .j n 3 g l UNDIST. ll COMPL, 24 HRS.
"'*"" "5fS8Erv: I ' EL^{ j FIRST
' "[o"$$"v'e'ar Ho "g 5' Drill andpipe 108 with wireline coring Bf:
BIT LOGGED CHECKED BY:
'J/A N/A N/A J. Glorib HOCK CORE I-w DESCRIPTION 3
] E SAND, moderate yellcwish brown, 10YR5/4, coarse grained, l- - well sorted. SM -- n v 2--
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becones mOre dense. '
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a : 5- - sone gravel to 1" diameter. - g 'O ' q": ' 6-- obbles and gravel -- sand becones tredlun to coarse grained.
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7 ~*- + L) 8-- , no gravel, color change to pale yellcwish brown,10YR6/2. -- 9 - -- n v . . . 10- - CLAY, very sandy, dark yellowish brcun, 10YR4/2, medlun -- "81: . grained, sone gravel, 3-4" thick clay. CL S.[i 11 @ SAND, reddish brcun,10R5/4, medlun to coarse grained, with " q occasional gravel 1/4-1/2" in diameter, dense. SP v 12- -
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u.) g : W 14 - - - . less dense. - fh ! 15- - -- en 4
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Project Nm. 412991 Field Log cf B: ring Nr. B-1 Sheet 2 cf 30 g HOCK CORE hS d
$f DESCRIPTION gg j
! SAND, pale yellowish bzwn, 10YR6/2, meditra to coarse . :. . 3 l 17-- grained with smo fines. SM
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20 -- yellowish brcm, 10YR5/4, fine to meditan grained, moder- -# @ ately well rounded, well sorted. g b 21 -- E G. 9
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22 -.. -si 1 ') 23- - 24-- !. h ,3 5 l 25 -- jp 26 -- grades to grayish orange,10YR7/4. _;., 1
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'O 29-- -a a 1 - : 301- ' n O 4g 31-- - 6 3 G4 1
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. moderate yellowish brown, 10 YRS /4, grades to mcdium la O grained. ,
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41299I B-1 ) Project Nr. Field Log cf Boring No. Sheet 3 cf_ 30 nocx cons e . E{P DESCHlPTION Sketch x d b x \ T SAND, xxxlerate yellwish brown, 10YR5/4, fine and r:vdiun {.S.7 36-~ grained, well rounded, well sorted, bright yellw grains ccrrprise about 5%. SP
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44.. . t 45-- --f , l cobble layer :0 90 ] rnedium grained, moderate yellwish brown,10YR5/4, rcurded -o 46- . quartz grains ccnprise 50--70%. J e,0, Oco
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48 SAbTSIOtE (San Mateo Ebrnation), rnoderate yellwish brwn, \ -0 lOYRS/4, coarse grained, well sorted, subangular, dark ard - l colored grains 85% quartz. SP 49T - cuttings are darker in color, probably due to ground-up g cobbles, dark gray cobble chips, arrgular, corprise 30-40%. 50 -- - w!! e 9 51- -
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7 9 g 53- . grades to mediun grain size. At
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Prriect N?. 41299I Field Log of Boring Nr. B-1
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Sheet 4 cf 30 ROCK CORE hI d DESCRIPTION Sketch i SN.IEIONE (San Matua Fonaticn),
, pale yellosish orange,10YR8/6, mediun to coarse grained, LJ well sorted, quart: 85% sub-rcundal, dark gray grains 10%
55-- _g,, o subangular to sub-rcurded, others 5% sub-angular. SP '~ f drilling sloa, fonration very dense. Z 56-- grades to raediun grained, scrne angular grains. 4: h 9' d 57- -
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._y 'J 67-- very unif nn coring. .'k:,
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Project Nr. -112991 Field Log cf Boring Nr. B-l Sheer = 5 eg 20 f tOCK COflE IE gg DESCHIPTION 39 % g e SANDS'IONE, pale yellwish bzwn, 10YR6/12, nxxliun grainal, 3 very dense, wil sortal, quartz 85% sub-rourvlod to rourxlea, F 74- dark gray grains 10% subangular to sub-rnanded, others 5%. 8E
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412991 P'-l ) Prriect Nw EP Fi;ld Log of Boring No. Sheet 6 cf 30 HOCK CORE 6 bU DESCRIPTION d O as sketch 5 m e = SANESIONE, pale yelloaish brosn,10YR6/2, meditm to coarse y g grained, well sorted, quartz 85-90% sub-rounde:1, dark minerals 10% subangular. SP 93-. __fz h b b 94- . __0= 0 5 O D 9 95- -
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10 6-- -- Q. 107-, - 4a grading to coarse grained.
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S 110-,
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Pr: ject Nr. 41299.r- Fi;ld Log of Boring Nr. B-1 Sheet 7 of 30 g_ HOCK CORE
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$g ESCRIPTION g 5 "
C SNamn,'E, pale yellcuish brcun, 10YR6/2, medlun grained, o O well sorted, dense, quartz 85% sub-rounded to rounded, 112- . __ S dark gray grains 10% subangular to sub-rounded, others 5% sub-roundal to subangular. Scre silt present. SP g
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117-- -- O 118-- SMJDSTONE, grayish orange, 10YR7/4, coarse to medium 119-- grained, well sorted, massive crumbly, occasional 1/4-1/2" pebbles, dense, 85% sub-rounded quartz, 15% sub-rourx3ed
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others. SP 120-- --
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120-- -_- 129- - 130-Woodward Clyde Consettants Krw
Pr:iect No. 412991 Fi;ld Log of Boring No. B-1 Sheet 8 of _ 30 HOCK CORE II d DESCn tPTION Z g gg g x ~ i D . [ 131-- --
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b 132-- -N l d 3 ) a .'
- 133- -
a t --@ - l 9 d 1342- SANDSTONE, silty, moderai.3 yellowish brown, 10 YRS /4, l -- mediun to fine grained, predcminately sub-rourried quartz h grains. SW 135-- 136-- -- ) 137-- -.g .
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138-- --d N a p ' b O l 139- - - g - T a - SANDSTONE, silty, dusky yellow, 5Y6/4, fine grained,
- 140-- massive, subangular (gritty feel). SW __
l l 141-- i ! 142-- -- 143-- -- D e l ~ e
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~ dusky yellos, SY6/4, grades fran fine to medium grainal, D
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- 1 147- - . slightly silty, massive, subangular, predoninately quartz. ; j .:::f:l> r-SP ~
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). 149- k.$, , Woodward Clyde ConsultantstrA vu 3
Praiect N;. 412991 Fi:Id Log of Boring No. B-1 Sheet 9 of 30 ROCK CORE 5G 6 6d as DESCRIPTION Sketch d e e e D 1502- -- gravel layer 2" thick, 1/2-1" diameter, rounded. SANDS 10tE, dark yellowish brcun, 10YR4/2, coarse grainer 3, __g 151-- gravelly, subangular to sub-rounded quartz (60%) and feldspar (25%). . o 8 D = .
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152- - --g m i Eis . e 153-- -- d g 154-- -- 155-- O I 156--
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157-- --q _ e r - O .g c=6 . 158-- -
.-.wC 159-- --
a, 160-- -- 161-- -- Ir 162-- -- l 163-- -- l J') , o N 164- - -- l l 165-.. - J 166. -- 167- - -- 168-
- Woodward.Clyde ConsultantsEA w
41299I ) Project NA EP Field Log cf Boring No. B-1 Sheet 10 cf 30 ROCK CORE 6 . g$ DESCRIPTION gg j @ 2 z e C SMOS'luiE, dusky yellos, SY6/4, rediun to fine grained, 3 subangular to sub-rcunded quartz (65%) with occasional :.o 169-- rounded gravel (1/2"-2" diameter). SP -- . g
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} 171 } CAY, sandy layer, light olive brown, 5Y5/6, with rounded pebbles. -- 5 o*. 172-- -- D 173-- -- 174-- 2- ) 175-- -- e i 176-- -- " o Do D = 177-- --3o. N 9
--M .9 178-- --*
3 . 179-- -- ! 180-- f i ) 181-- l-182-- -- 183-- -- l l 104-. - 4 185-- . .-
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Pricct N:. 412991 Fi:Id Log of Boring No. B-1 Sheet 11 cf 30 g
, HOCK CORE nn a yf DESCHIPTION Sketch f zfi 2
C O c SMSIDE (San Mateo Forrntion), dusky yellow, 5Y6/4, g , medium grained, quartz 95% sub-rounded, others 5% 188-- sub-rounded, occasional gravel. SP -- 189-- --N
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e 8 ; m 190-- --N - m 6 M .9 1912- -- 8 e 192-- -- 193-- J 194-- -- 195-- -- 196-- --
-To 197--
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198-- gravel 3/4"-1" diameter. -$ g ei h$ 199-- - g . _a J . 200-- -- 201-- -- '] 202-- l-203-- 2CM-- .--. N 205- - -- J 206-is Woodward.Clyde Consultants e
Project N2. 41299I Fi'.ld Log cf Boring N . B-1 Sheet _12 ef 30 ) ROCK CORE EP d - gd DESCRIPTION Sketch d O as x 4 x SANT6IONE, light olive gray, SYS/2, fine grained, slightly silty, gritty, with occassional (0-5%) very coarse sand } 207-and pebbles, massive, friable. SP , -- 208- - - m
.N D 209- -
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3 211-- - 212-- -- C 1 213-- d sv.: 214-- N N fi 215-- 216-- -- O i 217-- Thin hard layer. -- t I 218--
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D d 219-- s 53 l .. 5> ! 220-- -- 05 : S p' e$ 221-- -- 2222 - --
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223-- ~- 224-- -- J 225-Woodward Clyde Consultants w #A
Project Nr. 41299I Field Log cf Boring No. B-1 Sheet 13 cg 30 HOCK CORE
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DESCRIPTION Sketch d 0
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I 2262-hard layer m l SANDSIONE, meditm light gray, N6, mediun to fine grained, "l ' 227- . silty, very dense, sub-rounded quartz (85%) with small __ (1 m) blebs of silt and 2-5% biotite flakes. SW 228- -
--m 9
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! 229--
--3a s 230-- --
Q D 231-- -- J 1 232-- -- l l 233-- -- > 234- - m "m alternating 6" hard layers with 12-18" softer layers - 235- ~ SANDSIONE, dark gray, N3, fine to coarse grained with ~~O M~' sandy SILT ( 40%). SW $ g 236- - -- 237- - -- ) 238--
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239- - t m sua e m - ) 240-- CLAY, sandy, ~ dark gray, N3, (scraped frun core barrel tip). CL
- t. ..e to medium grained
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MW - m 241--- -- ' ,a. m a '-a ' ~ '
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242-- ~ ' ' 7 _, G 243- - } 244-Woodward.Clyde Consultants KAo
Project Nn 412991 Field Log cf Boring No. R-1 Sheet 14 of M ) HCCK CORE Ei- o SU DESCRIPTION c5 Sketch d O 5 g e 2452- -- 246- - ) 247-- --g
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248-- SANDS'IOfE, light olive gray, SYS/2, silty, with trace ,,3 !
e of clay, fine-grained, scrne iron oxide stains. SW d m e -
) 249-- -- I' d '
,Q" 9
c3 250-- -- ) 251-- -- 252-- -- ) 253--
,_ SANDSTONE (San Mateo Formation), yellcwish gray, 5Y7/2, [_
medium grained, sub-rounded to subangular, quartz 95% other dark minerals 5%, sub-rounded. SP ) 255-- -- 25 6-- - ) 257--
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) 259-- N I 8
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t':' 260-.,.- -- ) 261-- 262-- -- ) 263-Woodward Clyde ConsultantsKA w
Project N :. 41299I Fi:Id Log cf Boring N2. B-1 Sheetj5_._ e f 30 F1OCK COFIE 56
$w DESCFitPTION 6 -
as Sketch s ;b d bx e - 0 264-- -- 265 "- SNREIOtE, yellwish gray, 5Y7/2, meditm grained, sub- ~~ angular to sub-rounded. Quartz 95%, other dark minerals 5% subangular. SP G 26 6- - --
-M 2672-g o
g d 268-- 269--
-- 9 hl :
270-- -- 271-- -- 272-- -- 273-- SNiDeluE (San f4ateo Fornation), dusky yellw, SY6/4, very dense, poorly sorted, with gravel to 1/4", quart 85% o g , subrourded, feldspars 10% sub-rounded, other 5% angular " 274-- to sub-roundal, trace of clay. SW 275-- -- 276-- -- m 277-- --" A m
--d1 278-- "
U1 279-- -
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1 280-- --- W 281-- 2- - 282-EA Woodward Clyde Consultants o
Project Nr. 41299I Field Log cf B: ring N:. M1 Sheet 16 og_30 3 d HOCK COHE A g-F.E DESCHimM Sketch d O m C 3 e Ni 283; . SANDS'IONE (San Mateo Formation), yellcwish gray, 5Y7/2, __g nalium to fine gralnal 90% quartz sub-rounded. SP , Q
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284- -
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O' 285- - Q e ( 7.l: M 2861-m 287k- SANDSTONE, medium light gray , N61/2, fine grained, - - y;; gravel 1/4" sub-rounded, massive, no h.4ding 90% cyartz sub-roundal, feldspars 5% sub ~:unded, dark minerals 5% 288- - subangular to sub-rourried. SW -- n n 289-- -- 29 0-- -- i o .
-r A n lQ 291-- --d D
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292- -
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C - Q i 2: - 293- - a l 294- - --
??
0 295-- -- 296-. - 297- - _ a
~#
298- - o
=
D o
- q. U 299- -
p
~
$is .q 300- -
g
.. dl -
O 301- is: Woodward Clyde Consultants c./ #A
Project Nr. 412991 - i ! eld Log cf Boring No. B-1
' Sheet 17 cf 30 ROCK CORE av 4 .
w DESCRIPTION Sketch d 0
= x e x SANDSTONE (San bhtoo Ebrnation), meditm light gray, N61/2, 3 . fine to saedium grained, scme 1/4" gravel, gravel sub-302-- rounded, massive no bedding 90% quartz sub-rounded, --
feldspars 5% sub-rounded, dark minerals 5% subangular to 7:t sub-rounded. SP N 303- - --' ' d
~
'< h O 3m_ :. . ..s m
n i M I 0-i - .Q u 3052- -
-9 $!
5 O 306-- -- f.dl i! A-4 307-- , O 308- - 309- - --O l
. i n
J Q
~
310-- g g
--$ ^
w 311-- f .
-- (2 '
l .q - d J 312- ~ -- l 313--
- )
314-- ... l 315-. - l .O 5 ! 316-- - f n i O 317-- -- 04 in a : -
, D 0 .
,n.
318-- --g
~
319 - -- W o 320- - Woodward Clyde Consultants%v #4
Project NO. 41299I Field Log cf B: ring No. P--I Sheet 18 cf 30
, ROCK CORE Hh d =
lh y DESCRIPTION Sketch i O O- , 1 e SMMIME (San Mateo Ebzution), light olive gray 5Y5/2,
. fine to medium grained, scxne 1/4" diameter gravel, sub- *_
321-- rounded, massive no bedding quartz 85% sub-rounded, -- feldspars 10% sub-rounded, others 5% sub-rounded. SP 322- -
.m
. -r :
323- -
- o
- 2 :
.q i
.~
l 324-- - L !. ld ? j :c f 325-- --B l l 326-- -- D 327-- -- l I 328-- -- g h 329-- --
?66 o
" h l &
.Q 330-- --
g D 331-- 9
~
332-- - q .! yy
~ .
- 9 s 333-- -
f :
- 9 :
.b :-
334- ~ D i 335-I .. 336-- -- t ) 337- - i.6' SANDS'IME, light olive gray, SYS/2, fine to medlun grained, 338- - predoninately subangular to sub-rounded quartz, massive ~~ slightly silty. SP E J- 339- ~ .*;.... Woodward Clyde Consultants (v.A y
x Project N*, 41299I Fi-Jd Log cf Boring Nr. B-l Sheet 19 cf 30
..)
HOCK COHE EP e S$ DESCRIPTION O on Sketch i e e e SMMIOta: (San Mateo Ebmntion), light olive gray, 5Y5/2, ' <) nwx11un to carse grained, sub-rounded, quartz 80%, feld-340-- spara 10%, dark minerals 10%. SW -- 3; 341- - h 342- - _" 9 343- -
- dg g N 3 344--
d>
...g d5 345-- _. iE g
346- - . 347- - O 34o t - 349-- -- s o .) . 350"- _. 351-- __ 'g - g } 8 352-- _ _" cn
.d m 353y _ d2 !?
'2 m 31 ., !
u 354-- '
.. ~
355-- -. 5 j
\J 356- - --.
357-,-
'O 358 Woodward Clyde Consultants ($
Project N9 41299I Field Log cf Boring Nr. Sheet 20 gg 30
,,, HOCK CORE E ,F DESCRIPTION
$h 3 Q g x SR3XmXJE, light olive gray, SY5/2, medlun grained, sub-
, 359- - rounded, quartz 80%, feldspars 10% dark minerals 10%. -- SP 360- - 361- - o V ' i 362-- - ~9 . 1 o 1 U 3 363-- - s s?! l t2 364-- _ D l hard layer encountered only a fes inches thick. 365-- -- 366-- -- ) ) 367--
?
368-- -- D 369-- ' 370 -
- l. :n D
, 371-- --o . l m .. l 9 . l 372-- ~
~
l --d
- p 373-- .' i$
9 . g B 374-. - ) 375- - 376-- -- 1
> 377- '" '
Woodwart! Clyde Consultants h
Project Nr. 41299I Fi:Id Log cf Boring N2. BI
' Sheet 21 of _ 30 NOCK COFtE 5_e g0 otSCFilPTION 3
0 5 e e e SANDSTCNE, light olive gray, SYS/2, medium to coarse 'o'#
. grained, sub-rounded, quartz (70%), feldspirs (15%) and .,..
378-- dark minerals (15%), massive. SP .
-- E 4
379- - 380- - --
. 2 381-- -
-d 8 m d
.J ~
- n. m 382-- Jin r y
e .$@ n. g 383-- -- 9 d g 384-- -- l 385- -- b 38 6-- -- 387-- i h .a ! 388-- _. l l 389-- _. O 39 0-- - n m {5 l E. l 391-- - Q
~
i m d n, a , a, , 392- ~
~
hard layer g 393 - a) >
- .y;,;
394-- hani layer 7.~ dark minerals make up noticeably greater percentage (20%). _
~
395- - 396 Woodward Clyde Consultants <wy s
Project Nr. 41299I Fi:Id Log cf Bon.ng Nr. B-1 O-Sheet 22 cf 30 _ nocx cone [_b j -
$$ DESCRIPTION Sketch ,
g a h O 1 cr D 397- - , 398- - .. 399- - __ s 400 . D 401-- --
/
W 402-- -- J'% 403_- -. 7# 4 01-- _. O 405-- -. 406- - .. I
/s,
- J 407-- _-
408-- m J i 409-- -- l SANDS'IUE, light olive gray, SYS/2, sub-rounded to subm-i gular, nvxlitan grained, quartz (80%), feldspar (10%), arri .. 410:~, dark grains (10%), occasional coarse grains to 1/4". SP __ - ?$ ,J . 411-- --~ q ' hard layer aby g .R $ 412- - __g ,f v 3 . 413- - 4 414 -- O 415<
- 9.:
Woodward Clyde Consultants h
Pr ject No._ 41299I Fi:Id Log of Boring No. B-1 Sheet 23 of_30 g- HOCK CORE I ION Sketch d h m g e ) 416-- -- sn 417- - ) 418- - 4192-SMN, meditm gray, N5, meditm grained, quartz 75%
~~
sub-rcundal, feldspar 10% sub-rounded, dark minerals 15% 420-- sub-rounded to subangular. SP ,_ 1 421-- -- ) l 422-- -
~2 3
423--
- _. N o t
@s v 424-- --
b \ " l 425-- -- D 426-- -- l l 427-- -- ) l 428-- l 429-- -- D : '$ i 430- - 1 . o
.a 431"- h
- s
.W v D .
432-- 433-- -- ) 434- : Woodward Clyde Consultants h
Project Nr. 41299I Field Log cf Boring Nr. B-1 Sheet 24 of 30 HOCK CORE 5C 6 . 6 DESCRIPTION Sketch d b o z s -a cc q .e a - nn 435-- SANDS *r dE, rnediun gray, N5, medlun
- grained, quartz 75% --d sub-rounded, feldspars 10%, dark minerals 15-20% sub- ~ "
436 "- angular to sub-rounded. __ Q
,) '
437-- - 9 e a M Yll i 438-- J 439-- -- l . 3::::
.6
. LA 440--
Q~ 0 ' f 441--- - g 442-- - 7., ,v 443-- -- g 1 \ .. 444
!!arder drillire, color of drilling mud changed to olive z.
m gray. n:
- J n-445-- TJ SILTSKNE, dark gray, N3, with fine grained micaceous sand. ML
[-Z
,_1 l
446-- -- C
=
q nr
- v
- 3,;
447-- l --
~_._
1 t
. . _n' .
l 448-- Z{ ,) .-_ ~ 449-- --
= ~~
4507- -- _ n .m '_ ~ _ cn cd , T 451-- 4520-easier drilling. r:
=-_.
J 453-fi Woodward Clyde ConsultantsKA w
Project Nr. __41299I Field Log of B: ring No. B-1 Sheet 25 cf 30 v HOCK CORE
$f DESCRIPTION p,g E *
) 454-- . -- h2-SILTSIONE, olive gray, SY4/1, parallel horizontally bedded F _- 1/2 thick, with very thin lenses of fine grained sand, = micaceous. 2-455-- No visible joints or fractures, little or __ no weathering,1cw penneability. ML -g FZ3 ) 456- - h2 '
=
457-- -- ) 458--
'2~
459-- -- . V ) 460-- Light wathering, and lightly jointed generally at 50*. -
~-
S g e 8 , 3 461-- -- 'd ) i 462-- 463-- $ b b 464-
- O ,
0
-g g h l
, 9 .:P:. .. S
~y S
! 465-- D 'h 466.- -- ! 467-- -- D - m 468-- --m i
.:d M D 469-- -
g n In
- 3 470--
.e. . ...
- 2 9:
":3: ,
/
471- -
.pg .
sa )- 472- S.a.nple yields. a.ge...of Ime.r I.t. hnian (Upper Miocene) E-Woodward.Clyde Consultantsw.#) .
Pr: lect NT. 41299I Fi:Id Log cf Boring No. g P>- 1 Sheet 26 of 30 HOCK CORE EE o .
$g osscaseTION Sketch d d 5 473-- --
474-- --o
.o .
e '9 ho 475- -
-g l ,- .
in 476-- -- 0 I 7 :h 477-- -- 478-- SII1PS'IONE, grayish olive, 10Y4/2, parallel horizontally O bedded 1 1/2" thick with very thin lenses of fine grained 479-- sard, micaceous. Sane 3/4-1" gravel sub- rounded, slick-ensides, moderately weathered, arx1 fractured, no visible ~~ joints, low permeability. Forams and fish scales. 480-- . -- g'
-j tn sn o 481-- --
f - 482-- -- 9
-=-- )
9 483-- ' 4EM-~ --- o A
' tn n 485-- Sample yields age of Lower Mohnian (Upper Miocene).
l SANDS'IONE, olive gray, SY4/1, cross bedded, fine grained __ well conented, very well indurated. Jointed at 30* and mU 486f- 85*, moderately fractured. SP -- 7 SILTSTONE, olive black, SY2/1, parallel horizontally - 7 bedded 1/2" to 1 1/2" thick, micaceous with mineral spots 487-- possibly gypsun. ML -- 2 s
,.J._- l 488- --
- S @e 489--
72 highly weathered, highly fractured.
-,- 35 l 49 0- - -
491-l Woodward Clyde Consultantsv(A l
' Pyject Nr. 41299I -Field Log of Boring No. B-1 g %/
Shest 27 cf 30 ROCK CORE EP s . DESCRIPTION
- Sketch d g z
- =2
.4.> SILQ}. fn 'E, nolivetblack, SY2/1, parallel beddig rangig 35.',1/2" thick with very thin inter- 4 E"^ 4922-todding of fine grained sand, has bluish gray 1/4" thick h beds. ML & , 493-- -- - Samples taken at 493.5 ' and 495' yield age of Lower ,
- O Mohnian (upper Miocene). >
494- - m 8 Highly weathered, moderately fractured, joints vertical to 45'
~~
E w Well indurated, no fracturing, joints at 30',1/4" bluish O gray beds are irregularly laid. 496-- -- i 497-- SILTS'IONE, olive black, SY2/1, fissile to moderately frac- gh .O tured, fractures generally parallel to bedding but also C 498-- highly angled oblique to bedding, siltstone poorly in- h durated, irregularly beddr 3 with medium bluish gray micaceous clay, beddig horizontal to 30*, at 500' beds $
==
499-- highly contorted suggesting slumping, clay beds 1/16" to ~ 1/2" thick. Generally in uniform lenticular shape tut minor oblate pods also. ML
) ,
.O .,g; g 8-
- 500-- "
s g__ 501--
~
h E 4
~
Y0 . 502-503-- -- 10 504-- -- b o
. 8 505-- --
S .O _ 506-- - 50i- - SILTSTONE, olive black, 5Y2/1, . moderately fractured, O fractures generally parallel to bedding, beccmirg more _ indurated brittle with lenticular white sand size grains __ *E' of a micaceous material, also inclusions to 1/2" diameter -- b sub-rounded, tan, fine grained sandstone, interbedded with / G 8 irregular spaced . lenses of bluish gray micaceous silt- ~ 509I- ."_ ( stone, bedding dips 15-30', lenses to 1/4" thick. ML , g iO 510- - Woodward.Clyde Consultants h
Project Nr. 412991 Fi;ld Log cf Boring Nc. B-1 o Sheet 28 ef 30 ROCK CORE hE 6 bd 05 DESCRIPTION Sketch 5 g* d m e e.- k oo 511-- -- b:. G ~O 512- - -< SILTS'IONE, olive black, SY2/1, with irregular spaced lenses g and irregular shaped pods of bluish gray micaceous silt- g O stone. E 2 513- - 7 oo
- G g 5142- --
d O 515-- -- 2;' o m 516-- -- a: O 517:- SILTS'IONE, olive black, SY2/1 wita irregular spaced beds of bluish gray micaccous siltstone, beddirg 10-30*, lenses g 518-- 1/8"-1/4" thick, at 518.5' many lenses offset 1/8" along ~~ high angle fractures (50-65*). E - " o @
- 3 s m
519-- --
/
520-- SILTS'IONE, interbedded olive black, SY2/1, and bluish gray - micaceous siltstone, highly contorted balding with mirer
.O offset of beds, carpaction or slumping of soft sediments 521-- "
causing pinching out and irregular structures within bedding. E e 522-- .O 523-- f-524"- SILTSIONE, fragments, olive black, SY2/1, disoriented
, siltstone fragnents within matrix of bluish gray micaceous
.O silty clay, one siltstone fragment contains inprint of - 525-- fossil of unknown affinity. E -- A o e e-52 67- -- O 527-- L-SILTSIONE, olive black, 5Yl/2, very brittle to moderately :. 7 528-- indurated, discrimted, fractures generally parallel to ;_ o"" bedding, dire harizontal to 20*, siltstone more indurated ' h$ g "$ n below 529', irregularly spaced bluish gray lenses 1/16-1/8" " U .529- thick. ML q's Woodward Clyde ConsultantsKs w a
ProieCt Nr. 412991 Fi;ld Log of Boring No. B-1
-s Sheet 29 cf 30 ROCK CORE f$ d bd ob DESCRIPTION Sketch
=
d x e x N O' 530-- 4 4 e e- f$ n 531-- -- 2 O O 532- - S;LTSTONE, brownish black, SYR2/1, bedding generally -Z parallel raging fran horizontal to 40', fracture parallel 533-- to beddig planes, beddig 1/2-2" thick, sone vertical -- h' joints visible, bluish gray beds 1/8-1/4" thick, highly [ O fractured and weathered at 532-534', more indurated beloa 534-- 534'. ML -- oo co O 535-- --
# 0 O
536-- -- 4 3' 537-- 2 5 6 Highly fractured zone, siltstone crunbles easily. 538-- -- 539-- [ 5v 'o 5402-
. <:f e
@ k zd 541-- __
~
O . 542--
.4 543--
less indurated fractured, weathered. E 4 w 'O 544-- g
~
54 -- O h O 546-- - W 547--
%,,u .O 548- Hiohly fractured /r n^
Woodward.Clyde ConsultantsKsw
Prciect N7. 41299I Fi:Id Log of Boring No. B-1 Sheet 30 og 30 ROCK CORE hhw DESCRIPTION 6 .
- Sketch d e e 2
SII11SwNE, brownish black, SYR2/1, bedding ranging frcm horizontal to 40' dip, balding thickness frcm 1" to 3", ' fracturing generally in direction of bedding, moderately 549-- __ indurated, crumbles easily, some bluish gray beds present % $ k generally 1/8 to 1/4" thick. ML 550-- % n v % - 551-- SILTS'IONE, brownish black, SYR2/1, bedding generally hori- -- 'L zontal to 35* dip, highly fractured below 551' with M fractures ranging frcm horizontal to near vertical. ML. 552-- -- .n 553-- -- S $ 554-- -- 'O 555-- -- parallel bedding, highly weathered. L 556-- -- e. 8
- O st 557 unable to reenter boring after loss of casing.
Bottan of boring at 557' . .. 558-- -- 'O - 559-- -- 560- - O 561-- -- 562-- -- O 563-- , 564-- -- n v 565.- --- 566- - -- n,a 567' Woodward Clyde ConsultantsEAw
).. Project Nr. 412991 Fi:ld Log of Boring No. B-2 Sheet 1 of - @ 8 #' " #" ^*"
"'" ' S Damino Real Sta. 67 + 55 PMF Survev Work DRILLING AGENCY Continental Drilling lDRILLEQ NE FINISHED DATE STARTE%/05/GC j1gjgg DHILLING EQUIPMENT COMPLETION DEP H ~ TCCK DEPTH MWear 44 SIZE AND TYPE OF CASING 4" Standard op s uptgs! ~
"300Ery: 10 Drill pipe with wireline ooring i^tN !FIRST I COMPL. 24 HRS.
CORE BA E LENGTH 5' W m'
"'I DimM LOGGED BY: CHECKED BY:
Hector Reyes nock core n w h DESCRIPTION Sketch d g = 1--
~
SAND, silty, pale brown, 5YR5/2, medium to coarse __ grained, angular to sub-rounded, sand is trainly quartz, D. scrne broken rock fragments. SM 2-- -- 3.- -- O 4-- -- 5 -- 0 -: 6r -- I i .L l 4 7f -- 8-- -- g i ! O i 9-- -- y i 1 W !. ) 10 -t- -- ll i -- 12 -- -- I l l l l 13-- -- l SAND, silty to clayey, pale brown, SYR5/2, fine to coarse I Q grained, angular to sub-rounded, poorly sorted, silt and l 14 -- clay mixed with scx:e gravel and broken rock fragments. -- I SM-SC 15 -- -- p 16 l Woodward Clyde Consultants h '
Prciect Nr. 412991 Fi;ld i og of 8: ring No. B-2 Sheet E- of 39 g_ ROCK CORE
~b s .
2 8. o b uJ DESCR:PTION Og Sketch e g O m W e 2 Stam, light olive gray, SYR5/2, medium grained, sub-17-- angular to sub-rcunded, well sorted, mostly quartz with -- scre rock fragnunts. SP 18-- -- .-s, N. 19-- -- . O 20-- - d 4 O 21-- -- ' 22 -- -- q m 23 -- -- 24 --- -- T ,~, a 25-- -- 26-- -- v 27-- -- 28 -- -- ,\ y) 29-- __ 30-- --
?
s J
~
31-- - l 1
~
32-- - m
~
33-- --d
- 4
. d 34-- --
, 1
) 35 \
Woodward Clyde Consultants K y;Ap
Pr:iect Na, 412991 Fi:Id Log of Boring No. B-2 Sheet 3 of w O _ nock CORE sF 6 . DESCRIPTION gg a e x 36-- -- 37-- -- q
~~
38 -- -- 39-- --
.s J
^9--
41-- -- m J 42-- -- 43-- --
~
J p _ 45-- -- v 46-~ -- 47' SANDSTONE (San Mateo Fortration), light olive gray, v m SYRS/2, fine co medium grained, sub-rounded, well - 48-- sorted, nostly quartz with scrae rock fragnents, poorly __ O canented, forTnation denser than atove. SP - ' j
.- G 49 7- --M
, c 50 -- 2.
~
51-- -- J
+
52 '- -- SAND, nedium grained, gradational change. SW , 53-- -- 54 j Woodward Clyde ConsultantsACA vy
Pr;.ioc+ "la 412991 Fi:Id Log of Boring No. B-2 g - .~.. Sheet 4 cf 40 ROCK CORE w>_ 6 . DESCRIPTION
$$- Sketch i b x
C x O SANDSTONE (San Mateo Formation), light olive gray, m 55-- SYR5/2, raedium grained, sub-rounded, well sorted, nestly . quartz with sane rounded rock fragterits. SW ._3 56-- 3
- Gs M
e 57-- -- 58-- -- o 59 - 60-- -- O 61-- -- 62-- -- 9 63-- -- 64-- -- 9 65-- -- 66-- -- 67-- -- 68 -- -- 69-- - o
. 9 84 70--
--d G.
"' g 71 -- - 9
. Ed 72- ~ --
J 13-Woodward Clyde Consultants (v A
-,12991 Prriect N?. Fi;Id Log of Boring No. B-2 Sheet 5 cf 40 ROCK CORE
?E 6 .
DESCRIPTION Sketch d O e, g e e b' 74 --- -- 75-- -- D. 76-- -- 77-- -- r-D
- 78-- --O SANDSTONE (San Mateo Formation), light olive gray, g 5YR5/2, ooarse gra.ined, sub-rcunded to subangular, wil g sorted, poorly cemented, nostly quartz with scme rock 79--
fragments. SW --g b 80-- -- i 81-- -- b 82-- -- 83 -- -- O . 84-- -- 85-- - grading to coarse grained. .
~
O 86-- {- 87-- . , 88-- l l m ) 89-- -- I x Q
~
l I J- .
. eq 90-- -e i
..w i
- $ l 91-
-g 92-Woodward.Clyde ConsultantsKA w }
O e O O O O 9 e l
- e l
l t O O
41299I' Fi:Id Log cf B: ring No. B-2 Prziect Nr. Sheet 6 ef 40 ROCK CORE EP 6 . U DESCRi? TION
- Sketch d b 5
g e
)' 93--
SANDSTONE (San Matao Formation),
- light olive gray, --
SYRS/2, nodium grained, sub-rcunded, quartz 90%, -feld-94 -- -- ) 95-- -- 962- -- )-- 97-- -- grades to medium grained. 98 -- ) 99-- -- cs 4
.Q 1100__ _
_g h 101-- --
.. ~
2 102-- -- 1032- -- 104-- -- ) 105-- 106-- -- ) 107-- --
- grades fine tc nedium grained.
108-- o
~ .
)- 2
~
109--
--3 G
110- -' -- 111-d~A Woodward Clyde Consultants w.v
Pr.: lect Nr. 41299I Field Log of Boring No. B-2 Sheet 7 of M ROCK CORE xc b DESCRIPTION Sketch d SA! IDS'10!E, (San Mateo Fomation), light olive gray SYR5/2, 112-- Ireditra grained, sub-rounded. SkJ --
' ~~ ~~
grades to coares grained. 9-114- - 115-- -- s 116-- - 8 117-- --y ) . l 118-- - rg 119-- -- i t 120-- -- 121-- START REG]IOING FUNS. t 122-- -- i 123-- -- 124-- -
.n
.a 125- -
--h
.g
..a 126-- --g l
- g
! 127-- -- 128-- -- 129- - -- g s (' 130- < Woodward Clyde ConsultantsKA w _.
Project No. 412991 Fi:Id Log of Boring No._ 9-2 Sheet 8 of 40 r ;- w ROCK CORE DESCalPTION Sketch i e c 131-- SANDSTONE (San Mateo Formation), lignt olive gray,
. SYR5/2, medium grained, sub-rcunded, quartz 90%, feld-132-- spar 5%, others 5%, dense fornation. SP --
G 133-- _. 1341- --
~i
' ,m 135-- ---
.o .
.Z :
l i 136-- 'a. m l
- - l
_.R 9 b 137--
-2 l
138-- -- g' 1.39-- -- 140-- I 141-_ 142-- _- O 143-- __ 144 - _ _Z /% a - - 145--
.'-3 :
e"
- 9 :
.. ..a ,m 146-- -
- ,)
i% 147- _ __ 148-- _~_ .,w!) 149- . f.g Woodward Clyde Consultants [$r
i O l 9 9 9 0 9 9 9 9 9 1 G f' 1 i _
Project N . 412991 Fi;ld Log of Boring No. B-2 Sheet 12 cf @
,_ ROCK CORE
$b 'd .
DEERRON h Sketch d a x ) 207-- -- 208-- -- SANDSTONE (San Mateo Formation), light olive gray, @ ] SYR5/2, medium to fine grained, sub-rounded, well 209- - sorted, quartz 90%, feldspar 7%, others 3%. SP -- 210-- --
.e 3 211--
212-- -- D 213-- -- 214-- -- 1 D ! 215-- - 216-- _'.'_~ d ~ 13 ) l
-4 217-- -
-d 9
' c1 218-- --
] e. i 219-- -- 220-- - ) l 221-- - e
~
l ..
- c) 222-- --"
.f Z ',
} 223-- -d N
.' 9
. b 224-- -
a ) 225-Woodward Clyde Consultantsnw
. Pr: ject Nr. 412991 - FitId Log of Boring No. B-2 Sheet 13 of 40 .V ROCK CORE h5 o
'dh O t-DESCRIPTION Sketch d O 5 y c:
e .O 226-- -- 227-- -- SANDSTONE (San Mateo Formation), light olive gray, i n" SYR5/2, medium to fine grained, sub-rounded, well N 228-- sortal, quartz 90%, feldspar 5%, others 5%. SP --
,82 9 -- --
- O 230-- ,
231-- !O 232-- __ 233-- -- 10 - l 234-- -- l
..m
.N 235-- -
Q 'O 236-- ---
- $ m N'
u
-3 g
237-- Ei l
-h9 d
- o w
l 238-- __ l
.. j 239-- --
.n a 1 240-- , 241-- 1 .n.. a . 242-- __ N 243- - I k V 244-Woodward Clyde Consultants (w 4
Prriect Ns. 412991 Fi:Id Log of Boring No. B-2 v Sheet 14 of 40 zp ROCK CORE kU ob DESCRIPTION 6 . Sketch d E e i n e AJ : 245- - __
.:.5 246--
SANDSTONE (San Mateo Formation), light olive gray, N n" 5 YRS /2, nostly fine grained with scme medium grained, .. 247- - subangular to sub-rounded, well sorted, quartz 90%, feldspar 5%, others 5%. SP
--O 3:, ,
. C4 .$
248-- . ~4c s. O 249-- S .: .
- W
.:. 9
- !:S 250-- .
- n
.:::g s."2. .
.' O !!n 251-- i:s 252-- "
.;.-e O :::1.
253-- .. , 254-- -- u is n" . -in ?3( 255-- .n "
-- - SI O
256-- .' y ...n
-m !ii N !
i, 2 m
... i
- 9 :
257-- > p
~~
l S
..e s.; ..
I
.. 9:l*.
, *(
258-,- -- #,
.;i 259-- --
. .g
- l-ll 2M-- +
M lH S n ky} 261- -
-e ::: ,
262-- '
~ ;
Q l m !
, e :;;k',
U 263- :ijM Woodward Clyde Consultants Ksa
, PrrieCt Nr. 41299I Fi:Id Log of Boring No. B-2 Sheet 15 of @
v x-HH ROCK CORE gf DESCRIPTIOf4 Sketch 6 d 5
.);::
(n 264-- -- SANDSTONE (San Mateo Formation), light olive gray, SYR5/2, nostly fine grained, subangular to subrounded, 265-- well sorted, quartz 90%, feldspar 5%, others 5%. SP -- n o V
,266-- N
- 9~
e 267-- ---
% N
'o
~N 268-- -
269-- __ -n
'sJ 270-- --
M 271-- -O 272-- -- 273-- -- O . 274-- . n m 275-- o 276--
.: a s "
.. y
.- .t 277-- --
n.
- a. .
278-- -- 279-.. - 4
- s. .
280-- y .:.
.1 t-e 281-- ..p 358-
- Woodward Clyde ConsultantsKAv
g Praiect Nr. 412991 Fi:Id Log of Boring Nr. B-2 Sheet 20 cf 40
, ROCK CORE HH 6 .
DESCRIPTION Sketch fa x d O _ SANDSTONE (San Mateo Formation), light olive gray, 359-- SYRS/2, fine to medium grained, sub-rounded to sub- -- angular, well sorted, quartz 90%, feldspar 5%, others y 5%. SP 360-- -- ey a 361- - 3622- -- m w) 363-- -- 364-- 2-o c) 365-- --e
.m 9 -
366-- ~ e
--d 3 6 367-- - b ti
..g 368-- --
s.) 369-- -- 370-- -- 1
, l i '
371-- l 1 372-- --
- r-373 -- --m
.g 2
n 374-- --g m 6 3 $ 375-- -- 376-- :- O 377-Woodward.Clyde Consultants ecs KA
Pr:: lect Nr. 41299I Fi:Id Log of Boring No. B-2 Sheet 21 of 40 D ROCK CORE y& 6 . DESCRIPTION Sketch i 0 5 g z D 3782- SANDSTONE (San Mateo Formation),. light olive gray, -- p SYRS/2, coarse to medium grained, sub-rounded, well sorted, quartz 90%, feldspar 5%, others 5%, trace of 1/4" 379-- gravel. SP D . 380- - -- 3812- -- D 382-- -- 383-- - - a' 384-- --@
.o .
385-- - g i
- 0. i 386-- --
'9 .
_'E3 387-- -- 388-- -- 389-- SANDSTG E, light olive gray, SYR5/2, Coarse grained, -- sub-rounded, with sme 1/4" diameter gravel. SW s< 390-- -- 391-- q- . 392-- ~
'm
..M 393-- --pj
- R 394-- --%
..d 4
e> 395- ,- -- 3%- V/oodward.Clyde Consultantr, (TA x;;r
Pr;iect Nr. 41299I Field Log of Boring No. B-2 Sheet 22 of 40 d HOCK CORE h5 o g* OrscnlPTION Sketch d O e e e SANDSTONE, (San Mateo Formation), light olive gray, O 37R572, coarse to medium grained, well sorted, subrounded, 397-- quartz 90%, feldspars 5%, others 5%, trace 1/4" gravel. -- SP 398-- -- cn m 9 399-- -- 4002- -- n
%)
401-- 402-- -- V, 403-- -- 404-- -- Color change to nedium light gray, N5, medium grained. n 405--
..g
~
406-- -- r.q
.- G
-Q
- 407-- :s
- ' t2
.21 408-- -
'O 409-- - 410-- -- a '
~
1 l 411-- l 412-.. - i 4 413-- -- 4 414-- -- il 415-SNoodward Clyde ConsultantsEAw
Pr; ject N?. 41299I Fi:Id Log of Boring No. B-2 Sheet 23 of 40 i ROCK CORE h5 6 . g$- DESCRIPTION Sketch d e
^' ,' 4162- --
417-- SANDSTONE (San Mateo Formation), light olive gray, -- SYR4/1, medium grained, sub-rounded, well sorted, quartz _ 85%, feldspar 5%, others 10%. SP - l.) 418- - 4192- -- f3 420-- -- 421-- (3 422-- -- 423-- -- O 424-- -- 425-- ;
--Q
.o .
4 4262- -d ,n d v a 427-- -- q :$ v 428 . 429-- -- TJ U, 430-- .
-- T---
-~
431-- SILTS'IW E (Monterey Fonmtion), nudium dark gray,N4, _ _ _ highly micaceous. ML - - - 4- 432--
- E-Q 433-- --
j 434-Tt Woodward.Clyde ConsultantsEAw
Pr::iect N3. 41299I Fi:Id Log of Boring No. B-2 Sheet 24_cf 40 y- _ ROCK CORE w o . Si w DESCRIPTION 2 8. O o g, Sketch e g O 2 e e C
=- _
) . SILTS'ItJNE (Monterey Formation), medium dark gray, N4, E 435-- very micacecus. ML -- =
=
. =
436-- -- =
~:.
)
~~
437-- .
~ Zi
= m
=
. =
438-- -- =
=_
) E 439-- -- =
=
=
=
440-- -- =
~
) 441-- 2.-:
~ - ~
=
=
442-- -- =
=
=-
) =
=
443-- -- 444-- __ =
=
=
) . __ 445-- -. =
=
=
446-- __ =
- - - 5
) = 447-- 2- ._. -].
=
.. =
448-- -
^ ' "
) 449--
=
=._
.. =
450-- -- '__ ) 451--
. =
~~'
452-- ) 453- b Woodward Clyde Consultants h j
Project No, 41299I Field Log cf Boring Nr. B-2 Sheet 25 gg 40 ROCK CORE EC 6 . g$ DESCRIPTION 3% 2 g @ x
=
~, _ e x O 454- -
E r: SILTSIG E (Monterey Formation), medium dark gray, N4, .- aburrlant mica, scxm fine sand, pcosible chert lense er ~- 445 oncretion frczn 456' to 457' . ti -- r_; O 456- - E. N m.,. v e 4572- -- -e } _:- 458-- -- _-T_ 459-- SANDS' IGE, olive gray, SYR3/2, fine to cxxtrse grained h 40~ (rcostly rnedium grained), with a small anount of rounded . . . . pebbles and brcken gravel, sand is subangular tc sub- " rcunded, poorly to roderately sorted (high percentage of silt), quartz 80%, feldspar 5%, others 15%. Note: 461-- Scrne of the above material r:ny be the solids the driller is trying to wash cut frczn the inside of the rod. h 462-- -- i l l 463-- -- 3
- J -
l 464- - l 465-- -- e 4G6A- - 1 1 467-..- -- 468-- sand becomes darker in color and fine grained below 1- I
- 468' . Also silt content increases.
469-- -- s . j 470- - ..- __ SILTS'1VNE, dark olive gray, SYR2/1, very micaceous,
~ -~
471-~ -
- WY * '
~
F_ _4 l
-r )
. r J 472- .:
1 Woodward Clyde Const..innts h !
1 1 Project N1. 41299I Field Log cf Boring No, n-2 Sheet 26 of 40 HOCK CORE i : 6 . I b' DESCRIPTION O Sketch 3 y fd O c e
= '
g . SILTST0tJE (Monterey Formation), dark olive gray, SYR2/1, -_-- 473-- high mica content, scne very fine sarx1. ML -- _~_- 474-- -- -Z
=
g __.
-~
475- - m = v n 476-- --Q =
~
__ n
. -_. g S
477-- -- 9 5-2 __
=_.
p = 478-- -- ,:5 [- n q = 479-- -- C
=
=
~~
480-- --
=
q = 481-- i 482-- --
= -
co v Degan coring at 482.8' (slight caving in hole at start of -~ g , run #49). _
=
483-- -- n 4 81-- -- n n n
^-
es 485-- - n
.. SN;DS70t;E, light olive gray, SYF6/1, fine grained, very X f.
486-- well indurated, tedding at 25*, 1/16" to 1/8" thick. -- 2$
) , SILTST0t!E, clive black, SYR2/1, parallel bedding IS*, _
l 487-- 1" to 4" thick, interbedded with very fine grained -- sand, highly micaceous, little to no weathering, highly l
, fractured zone, slickensides in some fragments. ML -
488-_ - 2.. c.o
-) o sn
_ to n 489-- -- es l X l Unfractured siltstone. 49 &- -- 6;y' r l 491-p Woodward Clydo Consultants 6A t ;./ l
Project N3. 41299I Field Log cf Boring Nr. B-2 Sheet 27 er 40 O -" HOCK CORE iE P 6
$f DESCRIPTION Sketch d
." s O,' ' SILTSTOtIE (Monterey Formtion), olive black, SYR2/1, ^
492-- parallel bedding dipping 15' to 23*,' 1" to 2" thick with nnny interbeds of bluish gray micacecus siltstcne 1/16" b ce 8 IO 493- - ! # * @' "T U '"" "' lenticular, sand sized grains of micaceous nnterial (?) -- wit' tin the dark siltstone, nederately fissile with nest O 494, , jo: es parallel to beddirx3, wil indurated, little or no wathering. ML 4952- -- q 496-- -- co 497- - d 8
~
- G
'l g 499__ _.
s 499-- -- N D 500-- ke SILTS'IONE, olive black, SYR2/1, with bluish gray inter- $ j _ a01-- beds, occasional dark olive green fine sand lenses, " H dips range frcri vertical to horizontal, with fractures (G' 'O parallel to bedding, nest of the cored section is highly l 502- trecciated with contorted bedding, minor offsets of beds ~~
, and irregular cxrpaction or slunping structures, also .
with s xre slickenside surfaces inlicating movement, 5 503-- todding thickness ranges frcm less than 1/16" to 4", -- M naterial is highly micaceous, weathering ranges frcm very - g ,O little to noderate. tL 504-- -- pG n 505k' -- ' n
- g 506-- ,
507-.
-- -h e
~
b 508-- . 509-- w> 510< Woodward Clyde Consultantsw#A
i PrrieCt N,. 41299I Fi;ld Log cf Boring Nr. B-2 Sheet 28 cf 40 ROCK CORE Ep 6 1 bd i DESCRIPTION os sketch 5 i O e e e 3 SILTS'IUE (Monterey Formation), olive black, SYR2/1, 511-- contains 1/8" to 1/16" thick bluish gray contorted -- interbeds (to 516'), horizontal bedding 1/4" thick, fractures parallel to bedding, slickensided sur!! aces, 512- - scre thin lenses of very fine grained sand, very highly -- fractured ( to 512 ' ) , angular unconformity at 516', g bedding dips 70*, still displays slickensides along 513-- bedding planes and fractures, moderate weathering. E h
;a 514-- --
o 515-- -- b g 5 E 516-- -- o 517- - 7 518-- --
,/
519-- -- SILTS'luE, olive black, SYR2/1, tedding 1/4" to 2" thick 520-- with thin 1/4" to 1/16" bluish gray interteds and discon- -- ' tinuous lenses of claystone, dips range fran 20* to 35' O , 521-- with an apparent angular unconformity at 522', fractures E l generally parallel bedding, very highly fractured at -- 523' with slickenside surfaces cormon throughout cored , secticn, nederate weathering. E g g 522-- -- D . 523-- -- l 524-- N 525-- -- M The upper 16" of the core in Run #55 appears to be 52 6-- nnterial that has fallen into the bottcn of the hole ~~ ' and was then shoved into the core barrel. No structure 3 . to it. 527- - 32" of Run #56 was extracted from the core barrel, 7 however, the upper 16" of this care appeared to be nate ' :: o rial that had fallen into the hole while the rods were - * $ 528- - pulled. " The actual cored material is as above with s , J angular unconformities in the core, with dips of approxi- " l g g 529- mately 20*. ML e Woodward Clyde ConsultantsKA vu
Project N~, 412991 Field Log cf Boring Nr. n-2 Sheet 29 e g .a HOCK CORE h5 o
$d c5 DESCRIPTION Sketch 8
e e h b e Part of core very jumbled, lower part is intensely p r- g fractured siltstone with slickensides and a san 11 con- - * " 330-- cretien 0 529', with a poorly preserved clam shell cast. g -- q 531-- SILTSTCt E (Monterey Fornation), olive black, SYR2/1, with __ some bluish gray interbeds of clayey material 1/16" to 1/8" thic:k, upper 10" of core is rubble frcm caving of , 532- - the hole (not calculated in % recovery), the najority of $ p the core is very jumbled with randcmly oriented siltstone particles in a clayey nutrix, scrne bedding is contorted 533-- and scme is parallel with dips 30* to 45' and fractures g along bedding planes, many slickenside surfaces and intcnsely fractured zones. ML 534-- -- 535-- D
, o J ~
536-- -- SILTSItt E, olive black, SYR2/1, upper 20" of core is e 537-- rubble that has fallen into hole, junbled and contorted -- o 3 to 537.8', last 2 to 3" is a very fine sandy layer. 3 E 538 _- N 539-- SILTSTCt:E, olive black, SYR2/1, interbedded with bluish --
$*]
gray siltstone ranging frun 1/16 to 1" thick, bedding
') generally diping 30* to 45*, displacement of 1/2" in ,b 540-- beds displayed across fractures norTaal to bedding planes,
.. slichensides exhibited along bedding planes, nederately g
C $ fractured and weathered. ML / 541'-- --
/
,D 5p-- ' [/ Upper 2' of core very jumbled with broken siltstone .A5 3g __ , particles in a bluish gray clay matrix, some minor offsets beds and a few slickensides. ML e 544-- -- g 8 l
~
545- -- SILTS 10;E, olive black, 5YR2/3, with very few bluish gray clayey interbeds (1/16" to 1/4"), bedding is parallel and , l 547-- diPs at 20* to 25*, high percentage of fine sand in the -- m O l lower 1 1/2' of the cored section, nest fractures are .- l 549-Woodward.Clyde Consultants W(*
Project No. 41299I Fi;ld Log cf Boring Na. B-2 j Sheet 30 cf 40
, ROCK CORE
>- o gg[ DESCRIPTION Sketch d
~
slickensides found along fractured surfaces, weathering and fracturing are moderate. FL ] 549-- -- 3&f n a 8 550-g- 3 551- - SILTSTONE (Monterey Formation), olive black, SYR2/1 __ pcorly defined beddirg planes distinguished by sand size lentic 21ar micaceous (?) grains, nany bluish gray lenses s 552-- of clayey material which pinch out, scne of which show -- offset and display " flame-like" structures, dips fran O' 3 g ] to 90*, same intensely fractured zones, and slickensides r 553-- on nnny fractured surfaces, nederately weathered. FL --
~ ~
554-- ^' 3 555-- ~ SILTS'KNE, upper l' of core intensely fractured with -- nuny slickensides and bluish gray clayey layers, frcm gh , 555' to 556' a claycy zone with broken, angular silt- 7 g g 556-- stene particles mixed in, below this is another fracture -- l zone follcwed by a contorted, jumbled siltstone zone, ] dips highly variable, scme fine sandy lenses and offset ! 557-- bedding. FL -- l ' l 558-- -- i 559-- -- l l 560-- -- l D 0 561-- l g
.Q i 562-- -
-- ~
) . l 563--
- SILTSKNE still highly fractured with may slickensides, l nuch of the core consists of fractured si1*stene parti- -
5 cles with offset bedding and variable dips in a bluish .- i gray clay natrix. EL l 3 @ 565-- -- 8~
~
o 8 566-- 1-e b 567- D Woodward Clyde Consultantsnvs
i Project NS. 41299I Field Log cf Brring An. B-2 Sheet 31'cf_40 I. ROCK CORE Sketch d a A
)
568-- SILTSIO.T (Monterey Fonnation), olive black, SYR2/1, -- - interbedded with bluish gray siltstcne and occasional e thin beds of claystcne, siltstone beds rarse in dip fran ~ 569- - horizontal to 50*, fractures occur parallel to tedding -- planes, intennittent zones of contorted bedding with
) minor offset of beds, slickenside surfaces comon, highly 570- - fractured in zones, nederately weathered. ML --
571-- -- ) 572-- -- 573-- - 574-- -- 7 575-- SILTSIMT, bluish gray claystone teds beame thicker, ~~ ranging frcm 1/16" to 1/2
)
576-- -- 577-- -- R 2
) -
2 a 578-- __ g $ g 579-- .__ ) . $ 580-- -- g Lens of fine grained sand. d 5817'- Siltstcne becoming less fractured. __ 582--- ..- f N SILTSImT, bedding dip chances drastically frcm 50* to 583-- horizontal in 2' of core, at 584', bluish gray claystone -- beds are pinched out and slightly offset, siltstone ) 584- - becomes well indurated below 584', highly jointed, . o #
'slickensides comon. ML -"? 5 " S 585-- -
) 586-n Woodvrard.Chido Consultants w
Project NT. 41299I Field Log cf B: ring Nr. B-2 Sheet 32 cf 40 HOCK CORE 59 a gf DESCRIPTION Sketch i
. =
587-- SILTSKtE (Mcnterey Formation), olive black, SYR2/1, " intercedded witn bluish gray claystone and sandstone, beds range from 1/16" to 1" thick, dips range from 588-- horizontal to 18', no weathering, scrre jointing (verti- -- cal), occasit::nal thin lenses of sand (ash?) at 590', layer of very well indurated sandstone, fish-scales seen ). 589- - at 594', highly polished bedding plane surfaces. ML -- 590"- -- R g G "- y ) 591-- Very w ll indurated sanstone at 589.6' to 590.4' -- 6 592-- -- B g ) 593-- -- bx
=-
594-- ~- l SILTSK.tE, beds dipping nostly 35*, with clay-filled @ joints. IL 595-- -- 596-- -- 597-- --
/
p 8 j 598-- -- Highly contorted bedding, bluish gray claystone prevalent @ in this zone, highly fractured, clay-filled joints. 599-- -- 60 6- ) 601--
- l
~
602-- -- g e w - 603- -
.- g 2 $
3 g - N f. g 605- SE:. Woodward Clyde Consultants v.:;p KA
,, Project Nn. 41299I Field Log cf B: ring No. B-2 Sheet 33 cf 40 ROCK CORE EP 6 .
DESCRIPTION S$ o_ Sketch d m e g 3 3 SILTSTONE (Monterey Fomation), olive gray, SYR4/1, b 606-- in'erbedded with scrne fine sandstone and bluish gray -- dg claystone. Bedding from 1" to 7" thick with the inter- 2r 607-- beds less than 1" thick, dips are 35' to 40' with joints nostly parallel to bedding, scue are vertical, occasicnal -- h EE slickensides surfaces, well induratcd with very little $ 3 weathering. ML 608-- -- $p r=- 8
@i 609I- --
h n_ d <, y i. 610-- -- r 611- -- n V SILTSTONE, slightly fissile, bedding frcm 1" to 8" with a $ 612.- few thin claycy interbeds and fine sand beds, slightly ~~ fractured area frcm 616.5' to 617' , with slickenside E. l 613-- surfaces, dips at 40*, most fractures display slick surfaces. ML " U C O 614-- -- b-615-- -- h v _ b 616-- -- 617-- SILTSTONE, slightly higher percentage of fine sand, g slickenside surfaces cn fractures, dips average 25*. _ l 618-- ,,- % 619-- -- l v 620-,, -
=
g l' 621-- --
., y
^ *
- v .,
r- 8 - 622-- - ~'
, 1i ,
m ssr8 SILTSTONE, light olive gray, SYRS/2, scue fine grained 1 623-, - sand, silicified, roderately fractured with miror offset g ! I bedding, scme visible forams, dips approxinately 25*. -- ~ l 62N Vfoodward Clyde Consultants cs wy
. Prriect Nr. 41299I Fi;ld Log of Boring No. B-2 Sheet 34 ef 40 ROCK CORE h5 6 .
$$ DESCRIPTION 3%
Z O DE 5 y!g e STLTSluiE, light olive gray, SYR5/2, scne fine sand, very = 0 . hard, silicifial, moeerately fractured, visible forans, 625-- dips 25*. ML -- 626"- SILTSIUJE (Monterey Fornation), light olive gray, SYR5/2, -- interbedded with a few bluish gray clay lenses, highly -O . fractured and contorted zone at 626' to 627', dips 20* e a 627-- atove fractured zone and 35' below it, general fracture -- trend parallel to bedding with scne slickenside surfaces, scue joints near vertical, occasional pods or thin lenses 528-- of fine sand, well induratal, slightly weathered. ML --
=
.O 629-- -- m 630-- 2-O 631-- -- 632-~ - -- S O B G33-- -- 634-- -- O 635-- -- i 636-- SILTSTOtJE, olive gray-olive black, SYRl/2, appears -
~
O tre ciated through the entire run, containing nostly angular fragments of siltstone in silty matrix, dip of
~
637-- . _ fractures is 55' to 60*, mle 2.5" to 3" zone of shearing - (.
@ 638.5', also a very light gray, I;8, fire sandy layer, jt 638"- 1" or less thick @ 640.6' . 11 .,_
o : e w g fe 639-- --
~. %
Numerous strall pieces of siltstone at 639.8' . M 640"- -- D Ninerous polished surfaces, mostly not well irxluratal. M N O If 641-- r .. 642-- - '
~
c s.J 643' Ks Woodward.Clyde Consultants war
Project N r. 41299I Field Log cf 8: ring No. B-2 Sheet __ 35 cf 40 3 HOCK CORE EP s . bd co DESCRIPTION Sketch i O 5 et e 2 n
; t-644-- SILTS'lu;E (Monterey Fcrration), olive gray-olive black, ~~
SYR2/2, less brecciated, ced.c.nted layer @ 645.6', fractures with 55' to 60* di . t t1 gi 645-- -- e .O 646-- sy e- , 647-- M.' 8 8 (?S O 648-- -- N u 6 649-- -- g- .n' J.&. . %.) 650,- Intrusive with possible baked upper ccntact -- g 651-- -- n SILTS'1HJE, olive black, SYR2/1, bectres core dense and 652-- cemented, fractures are sub-horizontal, 65*, and ver-fk tical, lithologic charges at 653.4', 653.7', 654.2', .. 653-- ' *
' ## """ " F#Y' ' --
teds, one at bottcm is light bluish gray, 5B6/1, brecci- . n ated siltstcne. ML U 654- - Sanple taken at 654' yields age of Louisian (Middle -- N
,, Miocene). M g
% a m 655-- --
h.s NO .. 656-- --
.),
057-. - -- O - V 658-[- -- D Monterey Forration, basal unit consisting of glaucophane 659-- schist (low grade), dusky blue, SPB3/2, sandy r:ntrix with ,, m M p rtz grains. O m $ 660-- -- *
- 661--
b m. 662-
% ,. card.Clyde Consultants v_A E p
g Pr: ject N'a 412991 Fi:Id Log cf B: ring No. B-2 Sheet 36 ef 40 _ ROCK CORE p H o . g$ DESCRIPTION Sketch i g e 8 O 663-- BRECIA, dark bluish gray, 5B4/1, low grade blue schist, very weathered /rewrked. -- M e 664-- -- P9 R a M 665- - BRECCIA, dark bluish gray, 5B4/1, core is less broken-666-- nore intact, preconced brecciation, hard layer cn tcp, naterial is possibly reworked. "
,~
). 667-- -- 668i -- g h 3s 669 z 670-- m g a 671-- s t e l BRECCIA, (San Onofre Ereccia), medium bluish gray, 5B5/1, core contains nany angular clasts fran sand size l 672-- to clasts larger than the core dianeter (2 1/2"), trate- ~ ( rial is in a fine grained bluish gray chloritic natrix J which is highly weathered, nuch difficulty in keeping 673-- core intact, clasts are nainly glaucoplane shist, with " scnn nuscovite, lapedolit,e, plagioclase, quartz, garnet, i and pyrite, well developed schistcsity in nost frag- @ ,m l 674-- rrents. -- ' O 'm ~) l 675-- --
-. 9'd 676-- --
pg : l gy,o y 1 677-- -- n m @e 678-.. - M .) = , tiB. 1 679- - M
' - i 680- -
% ,3 681' h Woodward Clyde Consultants n-Kr \
l
Pr:iect N' 4 "MI Fi".!d Log of Boring No. B-2 Sheet 37 cf @ O ROCK CORE IE 6 oh DESCRIPTION Sketch i O e m e O 682-- EREDCIA (San Onofre Brecx:ia), raedium bluish gray, 5B5/1, nany angular clasts ranging frcm sand-sized to 4" to 5" (larger than 2 1/2" core diareter) in a blue gray, 683- - fine grained chloritic natrix, generally noderately to n V highly weathered, nest clasts display a well developed . 684- - schistosity and contain glaucophane, nuscovite, garnet, ' e j plagioclase, arx1 pyrite. G S 685-- -- 40
.~
O . 686-- --
.e-a _.
II$
- 687-- --
1 8 8 c u A 688-- -- 689-- --
~
m o O 69 0-- --
?5 691-- -
g h n V 692-- -- g C m O
.- o o
~
693- - Clay nutrix with clasts to 3". -- O
~
694-- Most piems less than 2" long. N ,* S Cores fracture easily. q l 1 695--
$hl l
0,_ i. 696-- e' 69~h- - - - g
, io
. m m 0 --
69e- - -- p& s
- 699-, -
- 8 d 700- E A '
Woodward Clyde Consultants (w '
.n Fiaject N 2 41299I Fi:Id Log of Boring Nn. B-2 Sheet 38 of @ v ROCK CORE EP d . DESCRIPTION Sketch d b
= z e E
M 8 O BREOCIA (San Onofre Brecx:ia), nedium bluish gray, 5B5/1, 701-- schistcse clasts are contained in -a light bluish gray -- cholorite natrix in various degrees of weathering clasts T'
. vary in size from sand size (medium grained) to larger ,
702-- than core size, clasts are nostly chlorite and glaucx>- --
$ g phane schist, 55* fracture surface dio.
O W 703- - W 704-- -- b m e 705-- -- D 3 8
=
R 70 6-- - O 707-- -- 3 s 'N 708-- -- p V Minerals embedded in natrix include quartz, bicy:.ite, garnets, amphibole, and glaucophane schist clasts. 709-- -- 710-- -- o
- o
- O 7112- --
9.s 712-- --
- n v
. o @
713-- -- S # 714-- ' O 715-- , 1-m
- 3 S
~
716-. -
~
o 717-. .. H e s 3
~
71 8-- - o
~ N 71 9 Woodward Clyde Consultants war #A
'q Project Nr. 41299I Field Log cf Boring Nc. B-2 Sheet 39 of @ ROCK CORE DESCRIPTION as Sketch I 3 x x n Only clasts recovered, no nutrix. U 720-- Clasts are angular, blue schists with gamet, biotite, -- pyrire, qur.rtz, ,rorphyroblasts, frcan pebble size to 3". S d Claets are fairly fresh. 721-- -- 722- - 723-- sn One fresh blue schist clast recovered. --
.o O 2E 724-- BRTCIA (San Onofre Breccia), medium bluish gray, 5B5/1, natrix supporting angular to rounded, generally metamo-rphic clasts from sand size to clasts longer than 2 725-- 1/2", poorly to nederately cemented natrix, natrix and 7 clasts fresh, no orientaticn, sortire, or stratificaticn -. v-O g, ,o O,
726-~ to clasts within natrix, natri'x is fine crained chlorite
~
M " " naterial. 727-- f c .O :p 728-- -- BRECCIA, highly fractured to nassive, wil indurated clasts to 5" or nore in length. ,' 729-- --%
..p . .
730-- m a e g g g 731-- m-
-a#
--0 ,
O 73 2-- 4
-vo
-v
^%a-733-BRECCIA, bluish gray matrix with rounded to angular J clasts. Friable to well indurated, roderately fractured. I.No O D'-
734-- -
+
- n. .h.-
.' ,, e s 73 5-- - 3
~ ~ 8
.O .+4 736--
.-s,.
737--
,, b- '~'
738- M Woodward Clyde ConsultantsKs vu
q Prriect N7. 41299I Field Log of B: ring No. B-2
' Sheet 40 cf 40 ROCK CORE 55 6 .
$g DESCRIPTION gg Z d C W
.vn - 739-- -- -, BRECCIA (San Onofre Breccia), raeditan bluish gray, 5B5/1, $1 cnloritic clay matrix contains nore sand than before, 740-- noderate to well cernented with clasts ranging in size -- f frcm sand size to larger than core barrel size, clasts O are angular to subangular, larger clasts are rnostly . 741- - chlorite and glaucophane schist, smaller clasts of -- :.f in quartzite, and anphibole, scre lenses of pcorly indurated .
~ 8 5
~
rnedium grained sandstone, joints at 35*, rnoderately .% 742-- weathered in zones, well indurated at 740.5' to 743 ' . -- o 743--
,o*
e ,. ; -- .,) 745;- -- g g g M.g,;. - n
, Clast is faulted and displaced 1/2". TE 74 6-- --
o 747-- y r-
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