ML20235B743
| ML20235B743 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Bodega Bay |
| Issue date: | 12/02/1960 |
| From: | Darragh R, Stickel J DAMES & MOORE |
| To: | |
| Shared Package | |
| ML20234A767 | List:
|
| References | |
| FOIA-85-665 NUDOCS 8709240211 | |
| Download: ML20235B743 (29) | |
Text
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FINAL REPORT
'PRELI!ENARY SOILS INVESTIGATION AND SEISMIC SURVEY PROPOSED NUCLEAR POWER PINiT BODEGA. BAY, CALIFORNIA I . FOR THE PACIFIC GAS & ELECTRIC COMPANY t-r .
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JOB NO. 160-30-03 O
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- Sa' F R A N C I S C O 11, C A LI F O R N t A
Deoember 2, 1960 ,
Pacific Gas & Electric Company 245 Market Street San Francisco 5, California Attention: Mr. Gordon L. Coltrin Gentlemen:
P1nal Report Preliminary soils Investigation and Seismic Survey
. Proposed Nuclear Povar Plant Bodega Bay, California !
Pbr the Pacific Gas 8: Electric Company )l
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BCOPE: l I
l This report presents results of our preliminary soils investigation at your Bodega Bay site. Phase I included a seismic survey in two parts and one test boring, the results of which vere sub-
- mitted in our report dated January 25, 1960 and our letter dated April 20, 1960. The second phase included drilling of ten additional test borings to more accurately define bedrock elevations.
The purpose of this report is to provide revised subsurface $.
information at the Bodega Ecad site to assist in planning plant layout and in accessing the rMamic risk of nuclear plant construction.
. General opinioue on cenr:ruction conditions are also provided based on our field observations.
SUBSURFACE CONIIETIONS:
The seis:nic refraction survey conducted in Phase I of this l
, investigation shoved bedrock to be considerably shallover than the
(
test borings disclosed in Phase II. The discrepancy in bedrock !
= e 4
.-__-____m__..:-_____
p ,.
e j' tr P.cific Oas & 51vtric conecay ,
P ce s:r 2, 1?50 n PMs 2 -
i elevations is due to the d. difficulties in interpreting seicnic velocity .
data for a four-fra.es s7r; ten there the depth to rock rapidly increasea or decrosses alon5 the caicr.ic lino. An indicated intermediate velocity ,
layer abors ths granitic rcok has fL-thor complicated the interpretation .
of the seisc:1c dats. Tt:ia uncenson occurrence results in a situation '2 termed the " case of the niecing layer." In other words, the velocit .
of this 1sysr is not found on the velocity section, and depth calcu y 2ations are too nhamy, as was generally the case here. The one test boring drilled in Phase I to correlate the seismic work had indicated '
excellent agreement between interpreted and actual depths to rock. It is obvious now that :nore tect borings should have been drilled to correlate with the seimic data in the areas of the steeply sloping rock.
Revised subsurface sections based upon the seismic survey and test boring data ars prosented on Plates 3A through 3D. The boring logs~
are presented on Plates hA through 1J. 6 Elevation contours of the bedrock surface are presented on Plate 2, Bedrock Surface Contour Map. he contours are based on the zuvised subsurface sections and'the topography and rock outcrops on Bodega Head.. The bedrock contour map does not have a high degree of ,
accuracy at other than boring locations. The depth to zoek calculatei )
frca the seimaio data did not agree with that determined by the test !
borings in the central area of the site because of the steeply sloping j rock surface and the inferred intermediate velocity layer. However, i the seismic data did accurately indicate whether the rock surface vsc sloping up or down or was relatively flat. The rock depths on the revised subsurface sections are about 90 percent accurate between borings. As the distance from the borings increases, the accuracy of the indicated rock depth generally decreases and may be as lov as 50 percent.
We understand that you desire to establish the plant grade between Elevation 10 e.nd '20 to m4**ze cooling vnter pac;ing costs. '
For a nuclear plant the most advr.ntageous rock elevation is about ten feet below plant gre.de. In this case, general site grading could be easily accomplished and the major plant units including the reactor could be founded in the granitic rock. Thus, the accuracy of the rock contour at Elevation 0 is the most significant for plant layout planning.
We believe that the test borings dr12. led in Phase II of our investin' tion and the revised seismic data have established the "O" contour within about 10-foot accuracy except at the southwest portion of'the site near l j
Seismic Lines E and C.
\
Near the intersection of Lines E and C, the Bedrock Surfsce Contour Map shows two sets of contours based ypon two different interpre-tations of the seismic. data. If this area is to be considered as a plant
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site, one or two test borings should be drilled to further define the bedrock surface.
The subsurface valley represented by the bedrock contours '
trends to the east with the vestern end at shallover depth than the '
eastern end. It is also our opinion that the subsurface valley was -
controlled by erosion and not by faulting. All subsurface information - '
indicates that the highest elevation of the bedrock surface -in the ,
bottom of the valley is at the vestern end, as suzzised by Dr. Don Tocher in his report to you dated Novendbar 11, 1960. The test pit dug along the western axis of the valley indicates that this highest elevation is about
+10.
The ground water encountered in the borings at about 40 to 65 feet above sea level appears to be perched on lenticular clay layers in the overburdan. The downward percolating rain water slowly migrates to the cliffs and seems to contirmally run out in springs or seeps. The ,
location and estiinated flow of these seepage zones in the cliff near Bodega Bay are shown on the Plot Plan.
CONSHtUCTION CONDITIONS:
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Excavation of the sandy and claysy soils may be accomplished '
by conventional loaders or scrapers with some light ripping in the cemented sands.- Deep permanent cuts in the overburden would be stable on slopes of about 1-1/2 horizontal to 1 vertical if the subsurface .
seepage water is intercepted behind the cut by drainage trenches, drain-age galleries or horizontal drains. Further studies would be required to determine the most satisfactory :r.eans of slope stabilization; }
1 Excavation of a poorly-camented conglomerate which locally overlies the granitic bedrock can be accomplished by ripping. About two to six feet of granitic rock can also be ripped with heavy equipnent, depending on the degree and depth of local weathering. ' The relatively unweathered rock vill require blasting in deep excavations. The ater encountered in the fractures in the rock during excavation can pahbly be handled by sump pumps.
The bottom eight feet of rock in Boring 5 was cored using an NX diamond core barrel. The cores vill be held for examination in our San Francisco office. -
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- , r-Pacific Gas & El ctric Contpany
'Dezemb r 2, 1960 i Page 4 ,
n, The fonoving Plates are attached and complete this report:
a:
Plate 1 - Revised Plot Plan Plate 2 - Bedrock krface Contour Map Plate M , Sabsurface Section, Lines A and B Plate.3B - kbsurface Section, Lines C and D Plate 3C - Sabsurface Section, Lines E and P Plate 3D - Subsurface Section, Line G Plate AA - Iog of Boring (Boring 1)
Plate 4B - Log of Boring (Boring 2)
Plate 40 - Log of Boring (Boring 2A) -
Plate 4D - Iag of Boring (Boring 3)
Plate 4E - Iog of Boring'(Boring 4).
Plate 4F - Iag of Boring (Boring 5)
Plate 40 - Log of Boring (Boring 6)
Plate 43 - Ing of Boring (Boring 7)
Plate 4I - Log of Boring (Boring 8)
Plate 4J-IogofBoring(Boring 9)
Plate 5 - Soil Classification Chart Yours very truly, DOES & N00RE
& WJ Robert D. Darragh RDD-JFS-GNB AT .
ohn P. Stickel, 646 (6 Copies Submitted) -
\ Attachments
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E 8 BORING I DRtLLED 10-13-60 90 48.503 N . 49,810 E 49,810 E to ELEVATION 77,4' E0m 520 & CLATET 120 70 l
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BORING 2 DR6LLE0 10-T.60 & 10-11 60- 1
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= WATER LE VEL (LEN5 OF BLUE $AND) 40 iD -
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' . ., 2 E' s BORING 3 ,
ORILLED 10-12-60 a 100 44,435 N: 50.016 E
,, ELE VAtl0N 93.6' BROWN SAND & CLATET $AND a 90 ,
80 TO 60 i .
- WATER LE VEL ,
60 ."
LIGHT BR0wk & GRAfl1H-6RCHN FINE gyg gg 70 C0AR5E 5AND WITN OCCA5 00hAL LATER5 0F LIGHT BROWN $ANDY CLAT I, 40 O'Il f!I' : .
30 .
l 0 .
'$ E t0 hi.i ,
. E 8
C -
g to ft::
E :
,e -
l 4 INTERBEDDED GRAY $ANDY CLAT &
!ph, 0 DARK GRAT FINE SANOT CLAT
- WifM gg h000 FRA$mENTS ,
'r$$
gf -10 il -
5
- -to L1
-30
+40 i, (GR ADI NG MOR E $ AND Y) 200 6 .cc%
100 g.oS*A 3 . % FRACTURED & JolNTED GRANIflC ROCE 60 too ,
3*-4 5*. , p i
l'~i ld_
LOG OF BORING
...e u se...iee s....sene PLATE 4D 1
1
1 . -. ,
e 2 3.:
=_
f NI BORING 4 *
- DRILLED 10- -60 & 10-17-60 48,45$ M, 49.639 k EL EVATION 93.0' BROWN 5AND & CLATET $AND 90 to
.ren 11, l
70 60
$0 -
I' - WATEM LEVEL
'Ir '
512.
,40 O
I p
5 b
'3 .
g03 .
/- :
- 20 INTERBE00E0 LATER$ 05 GRAYl$N= '
BR0h N $AND, GRAfl5N-GREEN $ANOT
,, D RG NT lti i0 lth :
fan I I C
,L .
u
-11 <
1 li -
-to LT.,
-30
-h= jffh,'h g::::g rRActm E0 5 x iMrE0 RANitic R0cc l
= i::nB
.A, .l i> LOG OF BORING
.a~... .....
- - PLATE 4E ,j j
P n.
s.
e -
2,: -
. g4 J5
!_ gii Es j: g gj BORING 5
.DRILLEO 10-87-60 & 10-18-60
,g 44,696 N, 49,835 E ELEVAfl0N 102.4' OR0mN $AND & CLATEY SMO 90 80 l.
LlGNT BROWN $ANDY CLAT hlTM II% !, OCCA510*
03l BRCbN ND $A'AL LATER$ OF GRAfl5H-
!i .
70 ll t ,
!$3 -' = =
WATER Lt VEL g 60 5 LIGHT oRavisN-sR0wN cLater sANov SILT 550
) 'W d
40 30 f
yy . - a 20 ano 6'.co"a noes oss
'I. 390 6'.as noen oss \
4 g $ $ .$*"$h ," GRAfi1N-GREEN $ANOV CLAY E1 10 - a 100 Q~
e'.oo"
- $*wx$#d ms'j:5 FRACTURED & JolNTED GRANITIC ROCK 6 *.lo a en en.c ;.e'
}g too etcr 9m ao 3 .so" , .-
eo r
3 '.ao" i
en pH .. &y an messas con sonet j
]
- LOG OF BORING l son ns....ees.. .eene s n PLATE 4F
y 4, -
p , ' * -
I -
'O'
..e e -
a.:
. . t.
l- ji
-3 BORING 6 DRILLED 10-06-60 & 10-19-40 E"" 5 48,206 N, 50,865 E ELEVAfl0N 806.98 SR W N 5AND & CLAYET $AND 100 90 90 .
8 4
,'l 70
- :l ,
h 60 "'
-s I s l
- ,, h> 60 !
-1 -
WATER LEVEL *
,< g .,
40 lN71RBE00ED LATER$ OF M RYllg.
, D' *.[
l44 30 ',: ' GREEN S ANO T CLAY , C AA K MA Y SANOT CLAT hlTH h000 FRAGMENTS 3g & GRAY FINE TO CCAR5E $AhD D
lll tfilI i 20 1
l ;
i I .20 a'.09% -
~$ f..lh.',{ FRACTURED & JOINTED ORANifl0 ROCK I l lll =
F::::: u
'1 0
i
- e. i 1
1 1
!) LOG OF BORING 1
l ommme s moons i
. m .................. I PLATE 4G. ,
i
__.____________________U
}y..c. r.
V tr ,
1 l ,
1 l' !!!
2:
=
s%
. -i P i' BORING CRILLEO 10-19 60 7
90 de,tli N, 49,492 E l
ELEVAtl0N 00.8' 80 BRCHN 5AND & CLATEV 1AND TO l
40 !
g { WATER LEVEL g GRAf flN=8ROWN P lNE TO MEDIUM 1AND 50 j,lh 8Ir g _
C LIGHT BROWN TO GRAYl5H-BROWN S AND
< 40 WITN OCCA5IONAL LATER5 0F LIGHT
$ OROWN SANOT CLAY d
^
g 30 s
ALfcRNATE LATERS OF GRAY SAND GRAtl5M-GREEN SAND T CLAT&OkRK 20 GRAT CLAY wt TN w000 FRAGMENT 5 l.
i 4 10 100 im
- 1. 10",
4 aco
...to ,r 2 .aov -
1 100 1 43Vl{
lf f $.00
[*I$ 'J;$7r FRACTURED & JOINTED GRAN1flC ROCK
... w w 0 - ...o,sa
. . .>., ,2.. . .,. -e
- >J, g p:;get
- 2,o
...xv
.lgl
.i0 m
J LOG OF BORING esasuums a neoosee
.. 6..................
. PLATE 4H
______-..._._,_.._.m.2.
-___ _mm mem mm,c, ,,
~-
- 6. -
e 3 ~*
. e.
Og sf dg BORING DRILLED 10-19-s0 B -
g g 4e,60s n. 49,sas s 110 ELEVAfl0N B02.9 BROWN 5AM0Y & CLATEY 5AND ORAYl1H-8RQvN 1&ND WITN OCCASIONAL 90 1 THIN LAYERS OF LIGHT BROMN 5ANDY CLAY ;
.0 i-l%
. 70 l
g3l I,
- ESTIMATED WATER LEVEL E s0 .
E-
'E I:
3 !5' .;
h I GRAfiSM-GREEN SANDY CLAY 40 t*
p>$. a n
v.,, ,
- v. .: ;
- lIi # INg
- 'E FRACTURED & JOINTED GRANITIC ROCK 20 aco v3.
v.55".-
e > ,
goo v.Sov ' a' 300 3'.lo" 5D,)
lf ,
soo sw v.rs *,
s' ts .-
s0 la 0
) LOG OF BORING
~
t DARENS S ButOORE esas asemanies sneessans PLATE 4I
~??c:kdG. 2MikSi2L&Mhss&Ltidi21ii2E-h&ididxLd.%?h:5 & L +idhh &JLG M sih M.pi',
'3 *
, y r
+
O
? .. i e
- 53 i
O d
df BORING DRILLED 10-20-60 9
.(
k
{ ** [ 48.535 N. 49.306 E 100 ELEVAtl0N 96.5' eR@N $AND & CL AYE T S AND 90 80 70 (0CCA110NAL PIECES OF N000) yy3 - - ESTINATED WATER LEVEL 88 60 l [
t55t 50 . -.
U =
=
., E 4, , AtrERNATE LATERs 05 Llant eRomisu
$ , GREEN $ANO LIGHT GRAY 1ANDY CLAT
! E a DAR: GRai CLAVER sANov silt 2:
- WITH WOOD FRAGMEN T1 5
w d 30 x4 20 ,
x 4, .a er 8I (5AND GRACES 70 GRAYa3REEN IN
,l 10 COLOR)
I l ,d
~ Ill - .m 2....,
.*%g
'l : 0 - 8#
am l'* S55'*-
s FRACTURED & J0tNTED GRANITIC ROCK
&+3e am a'.15%'*b<-,
'.lo", ', a iIs em ^ l 300 e .co * :>D t'.00"..
3 *. ph.
d i
300
.gg - 300 3'.20* .s. ' 9 g
300 3 ' 10" ',' *
- 800 t ' W.*'
~20 ,
I I .. .
LOG OF BORING f .)
I i
l l Dames a moona l q
PLATE 4J j l
., e., ;
i'
, 6 s-i C.. 4
- g. s.
e "s e
DOCKET 50-205 AMENDMENT NO. 3 PART IV D O
f*
f i
1 4
e i a
l 4
- - - - - - - A