ML19253B339
| ML19253B339 | |
| Person / Time | |
|---|---|
| Site: | Vallecitos File:GEH Hitachi icon.png |
| Issue date: | 09/06/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Darmitzel R GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 7910150323 | |
| Download: ML19253B339 (21) | |
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UNITEP STATES
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NUCLEAR 9EGULATORY COMMISSION y
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-E W ASHINGTON, D. C. 20S55 September 6, 1979 D n
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50-70 Mr. R. W. Darnitzel, Manager Irradiation Frocessing Product Section General Electric Company Vallecitos Nuclear Center P. O. Box 460 Pleasanton, California 94566
Dear Mr. Darmitzel:
Enclosed is a copy of the September 5,1979 report by the U. S. Geological Survey regarding the General Electric Test Reactor.
Sincerely, Y
Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors
Enclosure:
Report dtd. 9/5/79 cc w/ enclosure: See next page 1151 201 7910150,7 2 }
General Electric Company cc w/ enclosure (s):
California Department of Health ATTN: Chief Environmental Radiation Dr. Harry Foreman, Member Control Unit Atomic Safety and Licensing Board Radiologic Health Section Box 395, Mayo 714 P Street, Room 498 University of Minnesota Sacramento, California 95184 Minneapolis, Minnesota 55455 Honorable Ronald V. Dellums Ms. Barbara Shockley ATTN: Ms. Nancy Snow 1890 Bockman Road General Delivery, Civic Center San Lorenzo, California 94580 Station Oakland, California 94604 Advisory Committee on Reactor Safeguards Friends of the Earth U. S. Nuclear Regulatory Commission ATTN:
W. Andrew Baldwin, Esquire Washington, D. C.
20555 Legal Director 124 Spear Street San Francisco, California 94105 Jed Somit, Esquire 100 Bush Street Suite 304 San Francisco, California 94104 Herbert Grossman, Esq., Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 Mr. Gustave A. Linenberger, Member Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.
20555 George Edgar, Esquire Morgan, Lewis & Bockius 1800 M Street, NW Washington, D. C.
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t In Reply Refer To:
Mail Stop 905 SE? 5 1973 Mr. Harold Denton e
Director of the Office of Nuclear Reactor Regulations U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Denton:
Transmitted herewith, in response to the request of your staff, is our review of the geologic and seismologic data relevant to the General Electric Test Reactor at Vallecitos, California.
This review was prepared by Earl Brabb, Darral Herd and James F.
Devine.
Assistance was provided by Robert H. Morris.
Sincerely yours, f
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H. William Menard Director Enclosure t
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General Electric Test Reactor Vallecites ??uelear Center Vallecitos, California The U.S. Geological Survey (USGS) has reviewed the geolegic and seis=ologic aspects of the =aterial sub=itted by the General Electric Co=pany concerning the General Electric Test Reactor at Vallecitos, Califo rnia.
We conclude that the General Electric Cc=pany has not inves tigated adequately the site geology of the GETR to deter =ine to the degree necessary for NRC require =ents the potential for surf ace faulting at the Vallecitos. Nuclear Center.
Although the February 1979 report of Dr. R.
H. Jahns ad=1ts (10, p. 2; 11, p. I-1) that the Verona fault may exist.
the consultants for GE believe that the shears revealed by trenching at the GETR site are the result of landsliding about 70,000 to 125,000 years ago (12, p. 1).
Thus, al=ost the entire tenor of their reports (6 thrcugh 13) has been to docu=ent this landsliding and to deny faulting.
Consequently, critical f ault parameters, such as length, i
j vidth, sense of move =ent, and timing of movement, have not been deter =ined adequately.
Therefore, the potential for surface faulting or vibratory ground =otion at the GETR site has not been established reliably or adequately.
ARGDENTS FOR LACSLDING The original geologie explanation proposed by the licensee's consultants, Earth Science Associates, (7, p.17-33) to explain the 1151 204 N
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th urt fruiting seen in trenches T-1 and T-2 was that there are large 1::f:lides in the hill: ebr-te the GET? cite chich ht re beral frilure
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surf aces expressed as the faults seen in the trenches. Two a=phitheater-like landslide pull-avay sca:7s extending ainest to the crest of the hills were e= visioned. The probable main a:3 secendary slip surf aces of the landslides were shown on caps accenpanying the first report of the consu,,ltants on the GETR site (7, figs. 4 and 7).
Within the 'li=its of these great landslides, :he beds were reported (7,
- p. 17-32) to have a vide variation in attitude due to rotation of the interior of the landslides.
Stratigraphic lineations, presu= ably bedding, were reported to be discontinuous and disrupted within the landslide boundaries, and to be f airly continuous outside of the landslide area. Shear surf aces were reported (7, p. IV-34) to shallev in a northeasterly direction, presunably curving upward like landslide breaks beyond the eastern limits of the trenches excavated at the foot of the hills northeast of the GETR.
The so-called headwall scarps of the a=phitheater-like areas were subsequently trenched. The trenches revealed continuous beds and no e
features suggestive of large-scale landsliding. The reported variation in bedding can be accounted for in part by f aulting and folding, and locally by attitudes that were measured i= properly.
The chacges in dips and strikes of the bed could have been caused by tecronis= (the consui, tant's geologic _aps shev an anticlinal fold within the landslide area).
Greater disruption in beddi" ; cutside the beundaries of the purported landslides has not been de=onstrated.
The gee =etry of shear P00R ORGNAL u si
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..riaces at depth is very important but has not yet been deter: iced adequately.
Thus, all of the original evidence for landsliding has either been disproved or cannot be verified.
The only docu=entable portion of the landslide hypothesis consists of the shears seen in the trenches near the GETR, which the USGS o
attributes to faulting in the Verona fault zone of Herd (3).
6 The landslide hypothesis does not explain adequately geologic features in the Vallecito's Nuclear Center area.
Specifically, sene of these features are:
1.
The consultants geologic map (7, fig. 4) shows the middle conglomerate = ember of the Livernere Gravel as a continuous unit extending around the periphery of the reactor site. Attitudes and fold axes on their map indicate that from trench A for at last 14,000 feet to the southwest, this middle cenglocerate has a well-defined northeast-trending structural grain.
The unit is essentially truncated by northwest trending gravels within their upper gravel unit. In the vicinity of trench A, the stratigraphic separation is at least 3000 feet and, is probably closer to 4500 feet. The consultants (8, p. 4-5) explain this difference in thickness by progressive eastward thinning of the section, but their data to support this assertion (8, fig.11) does not show accurately the information on their geologic map. For exauple, in section DD', the contact of the stippled gravels in QTigu is nisplaced about 1/4 inch to the left.
The map indicates that these beds f.
dip about 35 degrees, but their geologic cross sectica shows 55 degrees. Liver: ore Gravel in the Vallecitos Hills is shown as i
P00ROR8NAL 1151 206
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strike of the cravel beds there is nearly 5"*
tha
--?arstely d!ppir.
- zrallel to the line ef re
- tien.,i'hese beds should hi re a nearly horizontal apparent dip.
Similarly, on section CC' ir the vicinity of the stippled gravel unit within QT1gu, the contact is misplaced and the dip used (45 ) is = ore *.han the observed true dip (35e) and,cuch more i
than the appagent dip.
If these discrepancies are taken into account; i
the change in thickness is = ore abrupt. The structurni-discerdn=ce must be explained either as an angular unconfor=itf, which has not been identified in any of the trenches, or by faulting. This fault cannot be the Willia =s f ault, which strikes about N.15' W.
(11, fig. 3). In our judgement it must be a vesterly striking fault, and we conclude that it is the verona thrust f ault.
2.
The log of trench 3-2 (7, fig. E-5) indicates a fault with a
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length of at least 8C feet extending into the earth at a distance of about 1400 feet fren the base of the near!-t large hill. The con,sultant's cross-section (7, fig. 8) speculates that this fault i
flattens at depth to confor= with their hypothesis that the fault forms t
part of the slip surface of a large landslide. The trench log indicates that the fault is actually steeper (28 ) in the botton part of the trench than in the upper part (18 to 23 ).
We believe that this fault is tectonic, rather than related to landsliding.
ARGUMENTS FOR FAULTING C.he U.S. Geological Survey i=vestigation of the Verona fault has been restricted in scope to studies designed to assecs regional f ault ha:ards (3), to a review of the literature, and to a review of P33R3Rj[gjg ug,,
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infor=ation developed by the consultants (ESA) to the General Electric Co=pany.
Our analysis correspondingly ic frag:entary and incomple:e.
Nevertheless, considerable evidence has been collected to show that the Verona thrust f ault is the most plausib1: explanation for the thear features observed near the CETR.
o Trenches T-1 and T-2 were dug by the licensee's consultant to 1.
6 test the existence of the Verona fault as capped by Eerd (3). Faulting (thrust) vas observed in both trenches where ::edicted by Herd (3). The dips of the f aults are si=ilar in both trenches; the geologie units of fset in both trenches and the direction of move =ent are also similar. We disagree with the interpretation offered in the ESA report i
of January 1978 (6, fig. B-2 and B-3) and believe that the upper =ost soil horizon of probable late Holocene age is also of fset.
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2.
Trench B-1 and an un=a=ed and unlogged trench nearby were dug to test the validity of the Verona f ault line mapped by Herd (3).
Faults were found in both trenches; again, the sense of movement i
(threse.) and units displaced are similar. We believe that the i
-f surficial, Holocene-age soils are offset in these trenches as well as in T-1 and T-2.
3 Trenches B-2 and H were dug, not td test a landslide hypothesis, but in response to an NRC requr.st after USGS and KRC geologists saw lineations in those areas-The direction of covecent, general dip and strike, and kinds of geolcgic units offset are si=ila:
C' to that seen in the earlier trenches. Here too, 'the upper =ost soil (Holocene age) is effset.
300R ORIGINAL i13i c08
4.
Trench C reouested by the USGS to ick lor the Verona fs ar area unef feeted by la.dsliding north est of the G' TR, was not t Instead, trench E was excavated. Although no..ridence for thrust f aulting was found, vestward-dipping f aults with no stratigraphie continuity across them were seen in the east end of trench E.
Trench E pas been interpreted by the consultants as both disproving the existence of the Verona f ault in that area, as well as limiting its northernmost extent. We believe that this tr och was not located properly. Low scarps vest of the end of trench E appear to be possibly fault-controlled; the Verona thrust fault may lie at their base.
Similarly,,a Dineseis profile (11, fig. C-2) near Sycanore Road has been cited as evidence that the Verona f ault does not exist south of trench E.
This profile, however, is permissive of an eastward-dipping thrust h
f ault which would energe in the area between reference points 105 and i
130.
, 5.
Trench A was dug at the suggestion of the USGS and NRC to exa=ine the anomalous thinning of the Livermore Gravel stratigraphic section in the hills northeast af the GETR and the abrupt structural ter=ination of the beds mentioned previously. USGS 3eologists predicted that the i.vona thrust fault sould be encountered in that trench, and that it is the cause of the apparent stratigraphic thinning of the Liver = ore Gravels between trench A and the GETR. A fault was indeed found,pn trench A, juxtaposing unlike Liver = ore Gravel sectf ns. ' The consultant, however, has interpreted this fault to be a high-angle feature associated with the northerly-trending W1111ans fault. USGS jj}j
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geologists believe the orientation, sense of move =ent, and age of the faults in trench A are comparable to those of the Verona f ault. The orientation of tne Villia=s fault (which strikes N.25 W.) cannot explain the structural dislocation and thinning observed.
The faults seen in trench A strike generally N.65' W. to N.80 W.
We believe that significant evidence for thrust faulting at this locality, has been overlooked and de also believe that the uppermost Holocene-age soil has been offset by this fault.
6.
East-west-striking beds in the hills east of Syca= ore Road are truncated at the southwest-facing escarpment of the Verona fault. This area is not shown as landslide by the consultant (7, fig. 4).
7.
Nearly vertical beds of the Livermore Gravel crop out along a creek east of Sycamore Road. This area is not mapped as a landslide by
'r the consultant. We believe these vertical beds are associated with thrust move =ent along the Verona fault.
8.
Si=ilar steeply dipping beds are present in a valley marked
" canyon excavation" by the consultant (7, fig. 4).
We believe these steep beds are related to fault movement.
j 9
Other geologists who have independently found evidence for a l
I prolongation of the Verona fault in a northerly direction are:
(A)
Hallenbech-McKay and Associates (5, fig. 3) who mapped a f ault with the same orientation and location as the Verona fault in the vicinity of Alisal Road.
The fault was mapped on the basis of photo N
lineations.
(B)
Judd Eull and Associates (4) who =apped a fault in 'he 1151 210
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vic r. :y of the sewage disposal plant in Pleasanton based on air photo lineatiens, of f set geologie materials, offset drainage channel, of fset water table, and seis=ic ancmalies. This fault is along the projection of the Verona f ault of Herd (3). Their work indicates that the Verona f ault is not limited by trench E, as stated by Jahns (10, p.12).
f (C) The California Department of Water Resources map (16 I
fig. 4) shows a fault similar in orientation and location to the fault i
mapped by Judd Hull and Associates. This fault appears to have been mapped by CDWR on the basis of offset gravel layers and a displaced water table. This information, plus information from other sources was used by the California Division of Mines and, Geology to establish a zone of potentially active f aulting under provisions of the Alquist-Priolo l
This zone is directly along the northerly projection of the Verona act.
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fault.
(D) Grisco=, et al. (15) interpret a gravity survey to indicate ancmalies in the vicinity of the Pleasantoa sewage plant,that
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l can be interpreted as a f ault. This independent survey corroborates the work of Judd Bull and Associates, CDWR, and CDM.
10 The presence of a possible fault at the foot of the hills behind the GETR, in the sane location as mapped by Herd (3), was noted previously by two consultants (1, 2) who prepared geologic reports for the General Electric Company.
In su==ary, the existence of the Verona f ault has been deter =ined n
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independently by a number of investigators using different methods, including two consultants for the 11cer.see, General Electric, in 1958 h
ar'. 1973 The existence of the. :.ault was tested by the current CI consultants, ESA, in 8 places end in our judge =ent confirmed in 7 of those places. D e sense of cove =ent in all places is consistent. The landslide hypothesis, in centrast, was tested in 3 places without success in our judge =ent.
In our view, the infor=ation provided by the licensee establishes fir =ly the existence of the Verona fault and does not support tife landslide hypothesis.
REGIONAL FAULT TECTON:05 Earth Sciences Associates (11) presente a tectonic model for the Livermore Valley region which would preclude both the Verona and Las Positas f aults. They believe that the cost striking characteristics of the structtire of the Live = ore Valley region is a consistent north-northwest-to northwest-trend of all major folds and faults and of most i
geologic contacts.
Survey mapping (Fig.1 is a generalized sketch of Su:vey mapping) shows the Livermore Valley to be an ano=alous east-west-trending valley bounded on the east, south, and vest by late Quaternary-age faults. An unusual cortheast-trending fault, the Las Positas fault, extends from the southeast corner of Livermore Valley southwest to La Costa Valley, just east of the GETR. The Las Positas fault is evidenced by offset stream terraces, a groundwater barrier, and geologic field relationships. The Las Positas fault is exposed in outcrop along Arroyo Seco south of Lawrence Liver = ore Laboratory, and has been trenched at n
the Sa'ndia Laborator: es texa=ined by USOS and Q:0 ge., logic personnel).
It is interesting to nete that in the one area where ISA has conducted
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Fig.1.--Te: tonic frameverk of Livermore Val'ey., Principal active faults arE shovm.
The maximum c:mpressile stiess axis is represented by the dark bold avcws.
1151 213
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field work near the Las positas fault (at its sou:hvest ecd), the geologic cap (11) is practically identical to that of Herd (3).
The Las Positas f ault erds to the northeast against the Greenville fault, a northwest-trending fault with evidence for right-slip move =ent.
The Calaveras-Sunol fault, a northwest-trending right-slip o
f ault, bounds the vest side of Liver = ore Valley.
f The tectoni'es of Liver = ore Valley are controlled by a right-lateral stress couple in the California Coast Ranges cau:ed by the northwestward move =ent of the Pacific plate past North A=erf:a. The =axi=um s tress axis of this right-lateral couple in the Liver = ore Valley area lies at an angle of about 30 to the strike of both the Calaveras-Sunol and Greenville fiults (the =axinu= stress axis of a stress ellipsoid bisects the 60 angle between intersecting strike-slip failure planes of the s
1his right-latet al stress couple causes right-slip stress ellipsoid).
move =ent along the Calaveras-Sunol fault, and could produce left-lateral strike-slip, cove =ent along the Las Positas f ault, which lies at a 60 angle to the Calaveras-Sunol fault. Although there is no geologically vell-docu=ented strike-slip ce=ponent of move =ent along the Las Positas fcult, the groundwater barrier along the fault near Irvrence Livermore
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Laboratory (3), possible horizontal slickensides seen in the f ault zone in trenches at the Sandia Laboratories, and change in direction in face of scarps along the f ault are consistent with lef t-lateral strike-slip
=ove=p,nt.
Thrust =ove=ent along a vest-to vest-=crthwest-trending Verona f ault would be expected because the f ault lies nearly perpendicular to l151 214
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the maxi =um stress axis. The Verona fault apparently joins the Las Positas fault east of the GETR (the southeastward prolongation of the Verona fault is exposed in both trench A and in the La Costa Tater Tunnel), and lef t-lateral strike-slip =ovenent along the Las Positas f ault would cause vestward thrusting of Livermore Gravels plong the Verona fault.
6 North-south extension of Livermore Valley, which was originally proposed by the licensee's consultant (6) : explain the tectonics of the valley,and to negate the possibility of thrust faulting along the Verona f ault, nechanically cannot exist. The valley is compressed in a north-south direction by the maximum co=pressive stress which causes right -lateral strike-slip novenent along the northwest-trending f aults in the California Coast Ranges.
~
CONCLUSION Since the existence of the Verona fault has not been accepted by the licensee, the parameters necessary to deter =ine the potential for I
fault displacement and vibratory ground motion have not been determined adequately.
Specifically, 1.
The northern extension aad location of the Verona fault have not been established adequately. The infor=ation already available (5, 6,15) has not been evaluated properly.
2.
Likewise, the eastern extent of the Verona fault has not been dete ined. We believe the Verona fault probably extends into and be:c es a part of the Las Positas fault.
3 A conservative position based on infor=ation available is that '
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the Verona - Las Positas fault system extends frem the Calaveras to the Greesville fault, a distance of at least 29 km.
The hypothetical f ault proposed by the licensee is restricted to a distance of 8.2 km (7, p.1-12).
4.
The width of the fault system has not been detersiged adequately.
- v. ore critical ext =ination of the area beyond trenches B and H may show additional faulting relatd to the Verona thrust system.
I.
Trenches B and E do establish that the syste is at least 2000 feet vide in the vicinity of GETR.
5.
The geocetry of the fault system at depth has not been es tablish ed.
The dip of the f aults in all the trenches is critical in determining unether faulting or ILndsliding is involved but bore holes that could help resolve this probles were used only in trench T-1.
We believe that the consultant's interpretation (7, p. IV-34) of a northward shallowing of shear surf aces between trench T-3 and bore holes BE-1 and BH-3 is incorrect, and that the same evidence can be used to establish a thrust f ault dipping northward.
6.
The age of the f ault system has not been well established. Roy Shie=on, soil consultant for the licensee has argued that the 2est move =ent on faults in the CITR area predates the development of the uppermost Holocene-age soil. However, we believe that f aulting at the GETR site displaces this most recent soil, and that this recency of f aulting de=enstrated repeatedly in the 7 trenches which exposed the L*
Verona' fault.
l 7.
The potential for surf ace faulting beneath the GETR vessel P0(RORGU_
1151 216 O
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cannot be evaluated properly with the infor=ation currently available.
[
The one trench (trench B) that has been excavated i=:ediately next to the reactor is insufficient to preclude f aulting. In that trench, no faults were seen striking toward the reactor vessel. However, late Quaternary alluvium, which could obscure faults in older, underlying Livernore Gravel, was exposed in the trench immediately opposite the e
reactor vessel. The assertion that there has been no faulting in the CETR site area in the last million years becaus e Livermore Gravel was not exposed in that trench is not conclusive. There could well be other unknown faults which directly pass beneath the reactor vetsel which would have not been seen in trench 3, or which have an older age of last displace =ent.
Even if there vere no known f aults directly beneath the GETR, the possibility of new surface f aulting beneath the reactor vessel cannot be discounted. The GETR lies within the center of the vide Verona thrust
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fault zone, and could well exprience surf ace faulting along a new break
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which could form in the zone. All faults are new at some time.
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8.
Inasmuch as the length, vidth, geometry, and age of the Verona f ault have not been determined, the Survey believes that any geologic i
and seismologic para =eters proposed for this site must refleet an awareness of this infor=ation deficiency. Consequently, the Survey reviewers believe that the next slip that could occur on the Verona greatly exceeds the propcsed one meter.
Also, the esticate of a cagnitude 7.3 earthquake occurring along the portion of the Calaveras
ith the above fault nearest the site (2 k=) is credible. (IS, p.All)
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centioned data void it is not possible to arrive at reasonable es i-t.tes ef the earthquake uire and resulting ground notion frem the canicus i
credible earthquake that could originate on the Verona and Las Posites I
faults. However, it should be rece=bered that the San Ternando earthquake of 1971 occurred on, as thee, a poorly known fault which may be si=ilar in many ways to the Verona-Las Positas fa21t system.
That 6
earthquake had a magnitude of 6.6 and produced ground motion in excess of 1 g acceleration very near the fault break.
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1151 218
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- -!~r-tes 1.
Andersen, R. I. and Jacebs, I. 1:., 1352. Tin-1 n =try :fe urrds report for the General Electric Test Reactor: unpubl. rept.
for General Electric Ce:pany, San Jose, California, p. 44-65.
2.
John Blu=e and Associates,1973, Seis=ic and geologic investigations for the General Electric Test Reactor a
facility: unpubl. rept. San Francisco, California, 17 p.
3.
Eerd, D. G.c 1977, Geologic map of the La s Positas, Greenville, and Verona faults, eastern Ala: eda County, California:
U.S.
Geol. Survey Open-file Map 77-689.
4.
Judd Hull and Associates,1977. Geolegic investigations for proposed Civic Center additions, 200 Bernal Avenue, i
Pleasanton, California: unpubl. rept., Hayward, California, 24 p.
i 5.
Hallenbeck-McKay and ssociates,1976, Geologic hazards investigation, Syca= ore Road near Happy Valley Road, i
I l
Pleasanton, California: unpubl. rept., E=ry111e, alifornia, 9 P-5.
Earth Sciences Associates, January,1978, Preliminary geologic I
investigation, General Electric Test Reactor Site, Vallecitos, California:
Palo Alto, California, 68 p.
7.
Earth Sciences Associates, February,1978, Geologic investigation,
(.
General Electric Test Reasetor site, Vallecitos, California:
Palo Alto, California, 6S p.,
300R ORGM 1151 219
6.
Carth Sciences Associates, April, 197!, GE:Ir-i: inte:tfratien,
i General Electric Test Reactor,.Valler.itos, California, addendus 1:
Palo Alto, C,alifornia 5 p.
i 9
Earth Sciences Associates, July,1978, Landslide stability,
)
Ggneral Electric Test Reactor Site Vallecitos, California:
Palo Alto, California 16 p.
- 10. Jahns, R. H., February,1979, Evaluation of seistic hazard at the General Electric Test Reactor site, California: 19 p.
- 11. Earth Sciences Associates, February,1979, Geologie investigation,
. phase 2, General Electric Test Reactor site, Vallecitos, California:
Palo Alto California, 58 p.
- 12. Darmitzel, R. W., March,1979, Response to coc=ents raised by NRC staf f and consultants concerning GETR geologic investigations at meeting of 3/20/79:
letter and enclosure, General Electric Company.
- 13. Dar=itzel, R. W., June,1979, Resonse to comments raised by NRC staff and consultants concerning GEIR phase 2 geologic i=vestigation: letter and enclosure, General Electric Company.
- 14. Coulter, H. V., March,1978, Review of geolegic data relevant to GETR site:
letter and enclosure, U.S. Geological Survey.
- 15. Irisco=, Andrev, Roberts, C. W., and Holden, K. D.,1979, Gravity data and interpretation of detailed gratity profiles in the Livernere Valley area, Califernia:
U.S. Geol. Survey Open-j jj}j
{)20
=e-,-
e n-we-eme
--se.
w-
e file Repor: 79-549, 8 p.
16.
Wright, R. R., R. C. Harding, and D. M. Tadon, The Las Positas fault,Alaneda County, California: an exanple of subsidence and/or tensional tectonics: Geol. Soc. Anerica, abstract for 75th Annual Cordilleran Section Meeting San Jose, California.
1 17.
California Depart =ent of Water Resourcses,1974, Evaluation of a
ground water resources, Liver = ore and Sunol Valleys: Calif.
Dept. Water Resources Bull. 118-2, 153 p.
18.
Eorche rdt, R. D., Editor,1975, Studies for Seismic Zonation of the San Trancisco Bay Regien:
U.S. Geological Survey Professional Report 941-A, 102 pp.
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