ML20212M435
Text
ys' f YS,%.6 ; _ (, ~. ~
r hfi
.fr hhI fNh.I54 5' 5, POI.
"g, '
y k... y,, f ' a. M y.J +t.% Q- (... > f y,.
~
x a.
l.
7,.
~.
3 r-t-
Jul 11 I
I DOCKET NOS: 50-275 and 50-323 APPLICANT: PacificGasandElectricCompany(PG8E)
FACILITY: Diablo Canyon Units 1 and 2
.lL SIMIARY OF MEETING HELD ON JULY 5,1974'REGARDING OFFSHORE FAULTS
^i P t
A mieeting betwen representatives of PG&E, their consultant (Earth Sciences Associates), and the AEC was held at the applicant's offices in San Francisco on July 5,1974. A complete list of attendees 1s given in Enclosure No. 1.
The primary purpose of the meeting was to
".. _.M h' avebden ' initiated recentlyiby'the'. geological investigations which einseep review the prcgress of the offshore applicant " * ~ " a x
+w..
Earth Sciences Associates presented a sumary of the Diablo Canyon Offshore Seismic Interpretation Program, and the Prospectus on Future i
Data Acquisition and Interpretation Programs. This sumary is attached as Enclosure No. 2, and is divided into four parts:
1.
Existing data, 2.
State of interpretation, 3.
Future data acquisitions, 4.
Prospectus on future interpretations and final report.
In addition to the offshore work, representacives of Earth Sciences also discussed additional field work to be perfomed on land. This included explorations in the San 1.uis Range in the vicinity of the Hfguelito Feult, work near San Simeon Point where tertiary faulting has been reported. and some examination of the transverse range structures near Point Sal. Finally, PG&E is currently conduct.ing a review of aerial photographs that are available.
The subject of availability of oil company geological data was discussed at some length. PGAE indicated that they had contacted several companies and that arrangements could possibly be made to examine some of the data.
However, the oil companies cannot make the data available publicly.
In general, the data obtained by these companies gives only deep structure information, cad provides lighter coterage than that obtained from some
- ou...m.05&; wa.
u.
d Mh h_,,,
.w.a * =. >
8608260021 860801
.,_ m h-sw Am
%!a%
ens n-"
a.....................................
?
- n.
g.n.__
)
(
(
r
~
~
JUL 1 i B74 i
i l
PG&E indicated that all field work, both on land and offshore, would i
hopefully be completed by the end of July, and that their final report i
would be submitted to the staff by September 1,1974. Allowing appropriate time for staff and USGS review of this report, our safety evaluation of I
geology and seismology would probably be published around mid-October of i
1974.
I miginal Signed by Thomas J. Hirons Thomas J. Hirons, Project Manager Light Water Reactors Project Branch 1-3 Directorate of Licensing
Enclosures:
1.
Attendance List 2.
Sunnary of State of Diablo Canyon Offshore Seismic Interpretation and Prospectus on Future Data Acquisition and Interpretation Programs cc: Pacific Gas and Electric Company Mr. W. J. Lindblad
.......,., Andrew J. Skaff.,Esq.:.....y y..
g
" ~
^ Ms? Elizabeth EP Apfelberg 1.
Ms. Sandra A. Silver 9,N.)
L-Mr. John Forster Mr. Lonnie Valentine f
Mr. Gordon Silver Mr. William P. Cornwell
- ,. 3
.2
~
L,.
- _.Ldn lab e-TJHironsicT
. l.':.U%Ce
'IllIl74
^
'O-M # : --
~
712$pkuc.em.<m.s.tn amor esa.q.,.n.,p :...eA.,
w.m
,7
.=,7
. ; y,..,.
iw
. ~..,....,,,,,.,...,,.,,9,.3.h
- e.,...t 7
. 7......
.,:4
..v x a
x
'E 1
~N1
>t,ki,,
f,
~
5
.me P' [q, ij$.'.q.
s.
. $.. [ g. ;.' h
- h,
M.?
ENCLOSURE NO. 1-i ATTENDANCE LIST Pacific Gas and Electric Company Earth Sciences Associates (PG&EConsultant)
R. Bettinger V. J. Ghio D. H. Hamilton J. B. Hoch R. Wellingham F. F. Mautz*
J. C. Morrissey AEC - Licensing T. J. Hirons R. B. McMullen J. C. Stepp WW
- Denot's part time attendance e
F0/4 Br ~ 39/
M-//
p e n..
j e f.
..s. 4.t.. t
.m
- j... w.
. f.,.0. h.;f.?iY Y.f. p N' T
- M
.'.e i.fdj
$).
- p,...f
'..-:.' p, '.
.a.
i% #.
..4...
Summary.of State of Diablo'Offsho're' Seismic Interpretation '
and Frospectus on Future Data Acquisition'and Interpretation Prbgrams 1
~
Wee 1.
Existing data.
c.
USGS Kelez cruise sparker data covering area from Pt. Sal to Cape San Martin to an average distance of 10 miles offshore. Quality: good - poor; maximum penetration about 10,000 feet.
b.
USGS Bartlett data covering area from Point Sal to Cape San Martin. Tracks approach to within 3 miles of shore and extend approximately 15 miles off coast. Spacing between tracks is about 5 miles. Quality good to excellent;
'"r maximum penetration about 10,000 feet.
- c.
- BBN sparker data with high density coverage off Diablo Canyon site and north-west to Point Estero. Quality good; maximum penetration 3000 feet.
2, State of Interpretation.
A preliminary interpretation has been completed'of the USGS Keles cruise and all M
EN einin. Tiiin iniepewbdion ima wuwatrated uoon structures existing in tha 2.IIewoo and Pliocene strata in the offshore San;a Maria' Basin. The interpretation has also em-phasized determination of the nature of the congct between the Pliocene strata and the M:sozoic rocks which form the bedrock and basement complex bounding the east side of the Santa Maria Basin. A detailed examination also has been made of the function of the WNW-trending structures of the San Luis range with the eastern border of the San Luis range.
3.
Future Data Acquisitions c.
BBN sparker; maximum penetration 3000 feet.
1)
BBN has been contracted to shoot 240 miles of sparker line between Cape San Martin and Point Lobos. The purpose of this data is to trace the northern extension of the onshoro struc'.uros located by previous sparker surveys.
b.
Aquatronics sparker; maximum penetration about 4000 feet.
1)
Aquatronics has been retained to provido n more detailed assessment of the # t.uctural morger of the San Luis range structures and the structures WM/ g y
D'
'4 L>
.... a..
..k..
5.
k h,%,
. \\ :.A,.
t.,
,A
' bounding the' eastern edge of the Santa Maria Basin.. They will also provide
~-
M 4
reconnaissance' data to be utilized in tracing the southern continuation of the offshoro structures.from Point Sal to Point Arguello.
Oil Company Data.
c.
1)
Plans are now in operatioil to obtain any available oil company data in the area of concern. These data will be useful in delineating the form of the basedlent sediment interface, but because of its mode of collection will not likely aid in interpreting the near surface (e.g., recent) geologic history of the region.
4, Prospectus on Future Interpretations and Final Report.
a.
Work to dato has delineated a major NW-trending zone of faulting immediately off the central California coastline. The available data have provided a picture of the trends and extent of major folds and faults in this zone. It has also de-lineated the major structural styles along the coast. Areas of particular inter.-
est where more interpretative work la necessary includei 1.
The juncture of pg;gg, the trends of the San Luis range with the eWorn edge of the Santa Marin Basin; 2.
The nature of the sediment basement interface along the entiro coastal area in question; and 3.
The determination of the relationship of observed structures futp the NW-trending faulting within and south of Monterey Bay and the EW-thcoding structures associated with the northwestern Transverse {tanges.
b.
The final report is to have the following form.
1)
A written report discussing the stratigraphy, structural style, and regional tectonic significance of the offshore fault systems of significance in evalu-ating carthquake hazards at the Diablo Canyon reactor sito.
- 2) The written report will be accompanied by maps showing a)
The position of surface geologic contacts and position of surface and subsurface faulting and fo[ ding.
b)
The thickness of Pliocene sediments.
c)
The configuration of the basement surface.
3) litustrations Will~also be included to show examples of the data used in C.
renching the conclusions presented in the report.
oo --
o E %,t h C rin n ene Acenel,*ae t
- p. 7- %,,
..+ w ~
~
, g;.
+
j, ^,
YMi...,...:..,.. '
l_) _
4. ;y;..
d.E,. G,,. ) - ['.:.
3..
4,,
7,.
d:: I,.[ ' I'.
... v.(
hi
~i :
Ofstribution:/
cket Fil J. M. Hendrie AEC PDR H. Denton Local PDR R. Maccary L Reading V. Stello R. C. DeYoung R. Tedesco R. Denise V. Benaroya K. Coller C. Long D. Muller J. Kastner D. Skovholt G. Lainas V. Moore D. Ross W. Butler T. Ippolito D. Vassallo S. Pawlicki g'.
O. Parr J. Knight K. Kniel L. Shao A. Schwencer B. Grimes J. Stolz W. Gammill R. A. Clark R. Ballard R. Ireland P. Fine R. Purple T. Novak 4
D. Ziemann M. Spangler P. Collins EP Pro.iect Manager - R. Cushman 011m:r O'i'.'
W. Houston R0(3)
G. Knighton V. Wilson G. Dicker R. F. Fraley, ACRS (16)
- 8. J. Youngblood LWR l-3 Reading W. H. Regan, Jr.
LWR l-3 File S. Varga T. J. Hirons P. W. Klecker R. B. McMullen J. C. Stepp 4
Foss1 CG-39/
A -//
r FF.LPSUE 1 n W'
- e unrrco srAlts J,p -.
ATOMIC ENERGY COMMiGS!ON
, g
.... r. n. u.. u.c. n s n 41 6
- 01.f. I 274 -
DOC!'ET HOS:
50-?75 and 50-323 APPLICANT:
PacificCasandFlectricCcmpany(PGSE)
FACILITY: Diablo Canyon Units 1 and 2 SU:'aARY OF IV.ETING HELD OU JULY 5,1974 REGARDING OFFSHORE FAULTS A meeting beteen representatives of PG&E, their consultant (Earth Sciences Associates), and the AEC uns held at the applicar.t's offices in San Francisco on July 5,1974. A complete list of attendees is given in Enclosure No. 1.
The primary purpose of the meeting was to revica the progress of the offshore geological investigations which have been initiated recently by the applicant.
Earth Science:. Associates prescated a summary of the Diablo Canyvn
, Otr' shore Seir.mic int.crpretation i'rogram, and the Prospectus on Future-Data Acquisition and Interpretation Programs. This sumnary is attached as Enclosure No. 2, and is divided into four parts:
1.
Existing data.
9 2.
State o'f interpretation, 3.
Future data acquisitions, 4.
Prospectus on future interpretations and final report.
In addition to the offshore work, representatives of Earth Sciences also discussed additional field work to be performed on land.
This included explorations in the San Luis Range in the vicinity of the Miguelito Fault, work near San Simeon Point where tertiary faulting has been reported, and some examination of the transverse range structures near Point Sal. Finally, PG&E is currently conducting a review of aerial photographs that are available.
The ' subject of availability of oil company geological data was discussed at some length.
PG&E indicated that they'had contacted several companies and that arrangements could possibly be made to examine some of the data.
However, the oil companies cannot make the data available publicly.
In general, the data obtained by these companies gives only deep structure information, and provides lighter coverage than that obtained from some of the recent USGS work.
e ptw4 ts-3W f-/s
I
- s PG&E indicated that all field work, both on land and of t shore ' ru k hopefully be coicpleted by the end of July, and that their final roport i
would i>< c.;.fr.:ii eJ to th: r.taf f by Septe::bcr 1,1974. Allowing epproaria.
tia:e for staff Sr.d USGS revie.! of Li is 1-eport, or safety evaluct. inn c','
geology and r.ei:a::oiogy would pro'xbly be published arounit nid-October of 1974.
O
~,( t.'<. :.
- l l/'O.a,ji-
/
Thomas J. litrcns, Project f*cnager Light l!ater iieactors Project Drar.ch 1-3 Directorate of Licensing
Enclosures:
1.
Attendance List 2.
Sum:11ary of State of Di:1blo Canyon Offshore seisr.iic Interpretation and Prospectus on Future Data Acquisition and Interpretation Progrc'.s cc:
Pacific Gas and Electric Company Mr. W. J. Lindblad Andrew J. Skaff, E'sq.
Ms. Elizabeth E. Apfelberg Ms. Sandra A. Silver Mr. John Forster lir. Lonnie Valentine Mr. Gordon Silver Mr. William P. Cornwell i
h -
..-m
.m
ENCLOSU?F !!O. !
ATTEllDS!!CE LIST t
Pacific Ges ;;r.4 Electric Cmpag Edeth Sciences A:societes (PCT E Cr n' ul tand__
R. ?,u t!. i ng e.-
1 V. J. Glio D. H. llenilton t
J.
B.' floch
!!. Melliauham F. f. Mautr.*
J. C. Morrissey AEC - Licensinq T. J. Hirons R. B. Mc!Nilen J. C. Stepp i
m
.m..
- Denotes part time attendance
s
_GlCLOWJ T#1. 2 Suraoury of Shtte of Di 6L i'Mhuro Sei >c'ie h*erpt elatian and Prospecius on Future Data Ac::uisition cod U np;etativa Progr.vna 1.
Ex.istin,; data, n.
USGS I~elez cruise sparker data coverr.: c re imr> R. F:.1 to Capa San Lt.u-tin to an aver ge distance of 10 miles offshore. Qualiip :ioud - Imor; rc.aximum penclration about 10,000 feet.
b.
USGi: Ilan tictL data cowring atea from Point 01 ta Cape Sra L!artin. Tracks approach to witbin 3 ruiles of shore med extend cpproximately 15 triles off coa st. Spacing Letween tracks is nbout 5 m!!cs Qa ility goo;! te er.cellent; nutximum penetration about 10,000 feet.
c.
BBN sparker data with high deurity coverage oi! Diablo Canyon cite and norih-west to Point Estero. Quality good; maximum per.attatiou 3000 feet.
2.
State of Interpretation.
A preliminary interpretation has buco cougit ted et the ubuh helez cruise and au BBN data. ' Itis intecptetation has concer.trated upon ettuctt.rcs existing in the 31iccone and Pliocege strata in the offshore Santa :.laria Basin. The interpretation has also em-W?l!*tM phasized determin:ition of the nature of the contset between the Plioceno strata and the 9
blesozoic rocks which form the bedrock :md basement complex bounding the cast side of the Santa lilaria Basin. A detaued examination also has been made of the unction of the WN\\V-trending structures of the San Luis range with the eastern border of the San Luis range.
3.
Future Data Acquisitions a.
BBN sparker; maximum penetration 3000 feet.
- 1) BBN has been contracted to shoot 240 miles of sparker line between Cape San Martin and Point Lobos. The purpose of this data is to trace the northern extension of the offshcro structures located by previous sparker surveys.
b.
Aquatronics sparker; maximum penetration about 4000 feet.
- 1) Aquatronics has been retained to provide a more detailed assessment of
~
the structural merger of the San Luis rango structures and the structures 1310 July 3,1974 1.
Earth Sciences Associates I
r0/A 86,-37/~
~
vir
boundin;c th" castern edge of the Santa Maria Basin. They will also provide reconnaiscace data lo be utilized in tracing LL southern continuation of a
the offshorc structures f rom !'.iir.L Sal to Point Arguello.
c.
Oil Company Data.
1)
Plans are now in operation to ahtain any available oil company data in the area of concern. Thene data will be useful in Gelineating the form of the b.tsonwnf. nedirneut in;crface, but baccuse of its mode of collection will not likely aid in interureijai; the near vurface (c.p., recent) geologic history of the region.
4.
Prospectuu on Future Intcrprelillom. ruxi l'IxJ Report.
a.
Work to date has delineated a major B"-trendity, zone of faulting immediately off the central California coastline. The available 0. ta have provided a picture of the trends and extent of major folds and faults in this zone. It has :dso de-lineated the major structural styles alon;c the coast. Areas of particular inter-est where more interpretative work is necessary include: 1.
The juncture of ihe trends of the San Luis range with the eastern edge of the Santa Maria Basin; 2.
The nature of the sedinw.t basement interface along the entire coastal arca in question; and 3.
The determination of the relationsidp cf observed structurec with the NW-trending faulting within and south of Monterey Bay and the EW-499 " 19]
trending structures associated with the northwestcru Transverse {langes.
b.
The final report is to have the following form.
1)
A written report discussing the stratigraphy, structural style, and regional tectonic significance of the offshore fault systems of significance in evalu-ating carthquake hazards at the Diablo Canyon reacter site.
- 2) The written report will be accompanied by maps showing:
a)
The position of surface geologic contacts and position of surface and subsurface faulting and folding.
b)
The thickness of Pliocene sediments.
c)
The configuration of the basement surface.
3)
Illustrations will also be included to show examples of the data used in reaching the conclusions presented in the report.
2.
Earth Sciences. Associates A-ac?