ML19326E239
| ML19326E239 | |
| Person / Time | |
|---|---|
| Site: | Vallecitos File:GEH Hitachi icon.png |
| Issue date: | 07/25/1980 |
| From: | Gilliland D GENERAL ELECTRIC CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8007280637 | |
| Download: ML19326E239 (4) | |
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GENER AL h ELECTRIC
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ENGINEERING GENERAL ELECTRIC COMPANY, P.o. box 460, PLEASANTON, CAltFoRNIA 94566 DIVISIOfl July 25, 1980 f
Mr. Darrell G. Eisenhut, Director Division of Operating Reactors Office of Nuclear Reactor Regulation f
U.S. Nuclear Regulatory Commission Washington, D. C. 20555
SUBJECT:
Landslide Stability Inve" Ligation of the General Electric Test
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Reactor (GETR) Site
'.icense TR Docket 50-70 l
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Dear Mr. Eisenhut:
.i The field exploration phase of the GETR landslide investigation has been
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completed. The summary report of the work performed is attached so that i
Mr. John Greeves can verify that the field work perfomed will provide
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satisfactory samples to determine the stability of the hills adjacent to the GETR under the present climatic conditions.
Very truly yours, y:
D. L. Gilliland
'w OFF ut L Manager
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The General Electric Company hereby submits the Summary of Field Exploration Phase, GETR Landslide Investigation dated July 22, 1980.
_ To the best of my knowledge and belief, the information contained therein is accurate.
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l-Submitted cad sworn before me this 25th day of July,1980.
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, Notary Public in and for the
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- County of Alameda, State of California.
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July 22,1980 MEMORANDUM l
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R. Darmitzel - GE i
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FROM:
D. M. Yadon - ES A h
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SUBJECT:
Summary of Field Exploration Phase,
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GETR Landslide Investigation j
Subsurface explorWm for this investigation was conducted during the period June 25, 1980 to July 10, 1980. The field investigation involved drilling, logging, sampling, and standard penetration testing of four rotary wash borings (numbered RD-1, RD-2, RD-3 and RD-4) in the GETR vicinity.
Three of the four borings are located approximately as shown on the map ac-i companying the proposed GETR landslide investigation submittal.
The fourth 4
boring was drilled adjacent to RD-2 to obtain additional samples from specifically l
targeted depths. Piezometers were installed in all borings, drilling fluid was flushed with compressed air, and ground water levels are being monitored.
The borings were sampled using a Pitcher Barrel coring san;pler and a Modi-fied California Drive sampler to obtain materials for laboratory shear strength
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testing.
A total of thirty seven Pitcher Barrels were taken with an average recovery of 78% and eight California Drive samples were taken with an average recovery of 65%. The borings ranged in depth from 30 feet (RD-1) to 433 feet (RD-3) with a total footage of 673 feet.
j Drilling operations were conducted by J. N. Pitcher Drilling Co.
l of East Palo Alto, California, under the direction and field supervision of f
Earth Sciences Associates (ESA).
All borings were logged by ESA personnel and preliminary copies of the field logs have been sent to Jol.n Greeves of NRC. ESA personnel handled, packed and transported all samples to the i
ESA geotechnical laboratary in Palo Alto.
i Earth Sciences Associates L
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Page 2 ll The geologic section penetrated by the exploratory borings consists of silty to claycy sands and gravels and silty clay-clayey silts of the Livermore Gravels formation. Cobbles up to several inches in diameter were common in the coarse grained units. These cobbles greatly impeded both drilling and sampling operations. Drilling in these coarse materials was slow, and sampling was difficult at shallow depths and not possible at depths greater than about 200 feet. Target sampling depths were chosen
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on the basis of geologic projection of shear planes observed in Trench B-3 y,
and computer generated failure surfaces from stability analyses.
Sampling l-t was not, however, restricted to these depths since the field engineer tried j
to ovoid sampling the very gravelly materials which tended to result in poor to no recovery. Finer grained silts and sands were the preferred sampling horizons.
I Penetration resistance tests were performed in RD-3 and RD-4 to obtain an in situ index of strength of the subsurface materials, particularly the coarse grained materials not amenable to undisturbed sampling. The penetration resistance (blow count) was recorded by ESA personnel.
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A suite of geophysical logs was run by ESA using a Wideo 1200 t
portable logging unit. These logs measured natural gamma radiation, spon-
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taneous potential, and resistivity of the borehole sidewall materials. These I
geophysical logs provide information for lithologic interpretation and geologic l:
correlation of the subsurface materials.
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