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RECEIVED AUG 1932 CL2'Xi FINAL REPORT: SHALLOW, HIGH-RESOLUTION SEISMIC PROFILING OE FIVE. GEORGIA RIVER LOCALITIES (t,L Uw &. luva k f'fAud : WO-nk,
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to The Earth and Water Division of the Georgia Department of Natural Resources from p
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The University of Georgia Marine Institute 2 8 "
and Skidaway' Institute of Oceanography l
I Vernon J. Henry, Principal Investigator l
31 July 1976 i
8505280469 841015 PDR FDIA SHOLLYB4-624 PDR l
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SHALLOW, HIGH-RESOLUTION SEISMIC PROFILING OF FIVE GEORGIA RIVER LOCALITIES INTRODUCTION Stratigraphic profiling using high-resolution seismic methods was carried out along five locations on four Georgia rivers--the Chattahoochee, the Flint, the Ocmulgee and the Savannah.
The field work was accomplished during April, and June 1976.
'N The equipment consisted of aN..EG&G UNIB00M system operated from an
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y outboard motor boat. A total of 72.2 line miles of seismic record were obtained.
Interpretations and correlations are preliminary and based on stratigraphic information provided by the Earth and Water Division of the Georgia Department of Natural Resources. The work was carried out through a contract to the University of Georgia Marine Institute by the Earth and Water Division.
DISCUSSION OF RESULTS location 1:
Chattahoochee River from boat ramp south of George W.
' Andrews lock and dam to U.S. Highway 84 bridge.
Date: 26 April 1976 l
j.
River Miles Run:
12.1 Comments:
Penetration along most of the survey route was approximately 100 ft. That portion.of the record from the Great Northern Paper Co.
to the U.S. Highway 84 bridge showed poor signatures apparently due to process sludge on the bottom. This mill effluent effected the water column and/or obscured the underlying strata.
Generally the records show a series.of gently dipping strata with.several lenses and facies changes within the Middle Eocene Lisbon Formation.
The relatively large e
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2 apparent syncline / anticline structures between reference points 9 and 24 are produced by the profile rounding two large curves up and down dip and across strike. The so-called Gordon Anticline is probably located just down river from this survey.
No faults or other geologic struc-tures were observed along the river.
Except for the portion of the river downstream from the Great Northern Paper Mill the river and stratigraphic conditions are satis-factory for sub-bottom profiling.
Location 2: Flint River from Reeves Landing to Camp Creek.
Date: 12 May 1976 River Miles Run: 9.1 Co rnents: This portion of the river was narrow, contained fallen trees, submerged sttr:ps and many very shallow areas. Due to the velocity of the river it was necessary to profile upstress to maintain control of the boat, thus causing considerable noise on the records. The quality of the record was generally good, however. Also, the boat had to be slowed to pass trees, stumps, etc., which caused some of the record to i
be obscured. Several strong reflectors were recorded which apparently continue north and south of the survey area. The top of the Cretaceous is well defined along the survey route. At Reeves Bluff the contact between the Cretaceous and the Paleocene Clayton Fonnation is approxi-mately 145 feet below the river level. This contact rises gradually until reference point 30 where the gradient steepens markedly. The l
Cretaceous appears to outcrop in the river bottom between reference points 32 and 33. An unidentified deeper reflector was recorded inter-mittently that generally paralleled the Cretaceous / Paleocene contact.
The top of this reflector ranged from approxicately 200 feet to 150 and e
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The relatively large Imdersonville Fault was recorded between reference points 34 and 35. Measurement of displacement, throw, etc.,
were not possible due to the lack of stratigraphic control. Several smaller faults occur on the downthrown side of the Andersonville Fault between reference points 35 and 37. Small faults with minor displace-ment also have been tentatively identified near Reeves Landing (refer-ence point 1).
Location 3: Ocmulgee River from 1 mile south of Big Indian Creek to State Highway 96 bridge.
Date: 14 May 1976 River Miles Run: 18.7 Coments: The Ocmulgee River in the study area is shallow and narrow and contains fallen trees and submerged stumps. Much of it could not have been surveyed had the water level not been higher than normal.
Du'e to current velocity it was necessary to profile upstream in order
. to maintain control of the boat. At the beginning of the profile the hydrophones were caught on a stump and broken; however, they were not damaged beyond field repair capabilities. Several times the catamaran carrying the transducer was caught by stumps and limbs, and by the end of the run was distorted in shape so much that it had to be disassembled and realigned. The record is of poor quality from both boat and river noise as well as ringing of the signal against the bottoa.- Depth of penetration ranges from about 5 to 50 feet, averaging about 30 feet.
Several scattered reflectors are present that probably represent lime-stone and/or chert lenses. No. structures were discerned; however S f-"*"
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4 Location 4:. Flint River south of Radium Springs.
Date$ 15 May 1976 i
River Miles Run: 4.0 Coments:
This portion of the Flint River is capable of being profiled only when the river level is higher than normal, as muc' of the channel h
is' filled with large chert boulders.
In order to maintain control of the boat in the very strong current it was necessary to profile upstream, adding boat noise" as well as river noise to the record. The record is fair to good to with3n about 50 feet of penetration. Some strong ring-ing of the signal against the bottom occurred although the upper 50 feet along much of the survey route showed generhlly horizontal, thinly bed-i ded strata, probably limestone and chert layers. The large sinkhole at reference point gwas profiled but no subsurface data was obtained probably due to the water noise associated with this feature. Unfortu-nately, the part of the Flint surveyed is navigable only during fairly high water during which the river time conditions are very poor acous-tically and are dangerous to men and equipment. After this survey it was necessary to realign the catamaran and replace the diaphram on the transducer after it was ripped on a chert boulder.
P Location 5: Savannah River from the top of Shirley Quadrangle to the Clyo Bridge.
Date: 22 June 1976 e
_ River Miles Rur.: 28.3 Convents:
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5 top of the Eocene (?), detected at the beginning of the profile at about 60 feet and followed to half way between reference points 17 and 18 and at,a depth ~of 130 feet. The top of the Oligocene was detected at ref-erence point 9 at a depth of about 35 feet and followed to bridge at a depth of 80 feet. The top of the Miocene was detected at reference point 18 at about 80 feet and followed to Clyo bridge at a depth of about 88 feet.
No structures were not'd.
The Savannah River is navi-e gable, so further seismic work could be easily carried out, preferably at r.ormal to low river level.,
a ATTACHMENTS Seismic Records: One (1) original and one (1) copy of the profiles obtained at the five localities described above. Geologic features are identified and explanatory notes are given on the copies only.
Location Maps: The location of each of the seismic records together with reference points along each transect is given on nine (9) topo-graphic maps attached as part of the repart.
t Submitted by:
kN
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Vernon J. Henry O
Professor of Geology University of Georgia l
31 July 1976 l
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.la :sn MEMORANDUM FOR:
Ina B. Alterman, Geologist Geology Section, GSB, DE a
FROM:
Phyllis A. Sobel, Seismologist Seismology.Section, GSB, DE
SUBJECT:
SEISMOLOGY REVIEW OF BECHTEL REPORT," STUDIES OF POSTULATED MILLETT FAULT" I have reviewed the seismicity information in the Bechtel report on the Millett Fault prepared for the Vo tle applicant. The availab,le seismicity information includes ( ) felt earthquakes, (2) reent instrumentally located events, and (3) data from the Savannah' River y,lant array, just across the Savannah River from the Vogtle site. The applicant concludes and I agree, that historic seismicity reveals no evidence of ~ active ' faulting in the area. The seismicity near the site has been scattered and low level (maximum MM intensity VI). No clustering of earthquakessoccurring near the postulated Millett or Statesboro faults.
Phyllis Sobel, Seismologist Seismology Section Geosciences Branch cc:
R. Jackson L. Reiter S. Brocoum P. Sobel A. K. Ibrahim 1
e
f fg Southern Company services. Inc.
Post Office Box 2625 b
Birmingham. Alabama 35202 Vogtie Projeet Telephone 205 870-6011 November 5,1982 Plant Vogtle - Units 1 and 2 LSV-NS-Id98 NRC Site Visit V-fi.01.02 File: X2BA03 Mr. D. O. Foster Georgia Power Company Atlanta, Georgia Daar Mr. Foster:
The NRC is scheduled to make a site visit concerning the Postulated flillett Fault issue on November 22 and 23. The tentative schedule of activities is as follows:
November k 1982 - Afternoon e flake helicopter tour of the general / area surrounding the Postulated Millett and Statesboro Faults.
e Visit the Belair Fault zone near Augusta.
.s5 Novembe r.e*,
1982 e Make river tour to investigate Savannah River Bluffs in the area from the site to the Postulated Millett Fault.
e Look at selected cores, to be determined later.
e Make site tour if time permits.
I will get with you to make detail arrangements when schedule is firm.
Sincerely, b-James A. Bailey Project Licensing flanager JAB /su xc: List attached, s
hb
c-
' W4
- g
- .
Mr. D. O. Foster
-November 5,:1982
-Page'2 xc:. R.-A. Thomas D. E.-Dutton
-O. Batum
-G. S. Grainger C. R. McCure T. W. Crosby R. A.' Jackson J. M. Grant I._B. Alterman / -
E. l..~Doolittle A. X. Ibrahim i
1
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v f
,