ML020300442

Part 4 of 5, Diablo Canyon Independent Spent Fuel Storage Installation, Submittal of Geologic Data Reports. Data Report D: Trenches in the ISFSI Study Area

ML020300442
Person / Time
Site:	Diablo Canyon
Issue date:	12/17/2001
From:	Bachhuber J William Lettis & Associates
To:	Office of Nuclear Reactor Regulation
References
+sispmjr200505, -nr, -RFPFR, DIL-01-005
Download: ML020300442 (66)

Text

DATA REPORT D TRENCHES IN THE ISFSI STUDY AREA DIABLO CANYON ISFSI PREPARED BY VERIFIED BY APPROVED BY

" 3l-*'*

DATE Jeff L. Bachhuber Printed Name

~ DATE Scott C. Lindvall Printed Name 12/17/01 William Lettis & Associates, Inc.

Organization William Lettis & Associates, Inc.

Organization A

DATE William D. Page Printed Name

/

PG&E Geosciences Dept.

Organization Diablo Canyon ISFSI Data Report D, Rev. I D-1 of 66

DATA REPORT D TRENCHES IN THE ISFSI STUDY AREA DIABLO CANYON ISFSI Table of Contents Page Introduction......................................................................................................

D-4 M ethodology...................................................................................................

D-4 Results.............................................................................................................

D-5 References........................................................................................................

D-6 List of Figures Figure D-1 Figure D-2 Figure D-3 Figure D-4 Figure D-5 Figure D-6 Figure D-7 Figure D-8 Figure D-9 Figure D-10 Figure D-1I Figure D-12 Figure D-13 Figure D-14 Figure D-15 Figure D-16 Figure D-17 Figure D-18 Location of Exploration Trenches Southward View of ISFSI Study Area Excavation of Trench T-11, View to South Trench T-1, View to Northeast Trench T-2, View to Northeast Trench T-3, View to the Northeast Trench T-4, View to the Northeast Trench T-5, View to North Trench T-6, View to the North Trench T-7, View to the Northeast Trench T-8, View to the Northeast Trench T-9 Trench T-10, View to the Southeast Trench T-11 Trench T-12 Trench T-13, View to Northwest Trench T-14, View to Northeast Trench T-15 D-2 of 66 Diablo Canyon ISFSI Data Report D, Rev. 1 1.0 2.0 3.0 4.0

Table of Contents (Continued)

Figure D-19 Trench T-16, View to the South Figure D-20 Trench T-17, (Foreground along Reservoir Road) View to the Southeast Figure D-21 Trench T-18, (Center of Photo) View to Southeast Figure D-22 Trench T-19, View to Northwest Figure D-23 Trench T-20A, South Wall Figure D-24 Trench T-21 A, View to Southwest Figure D-25 Trench T-22 List of Attachments Field Trench Logs D-3 of 66 Diablo Canyon ISFSI Data Report D, Rev. I

DCPP ISFSI SAR Data Report D Trenches in the ISFSI Study Area

1.0 INTRODUCTION

Twenty-two shallow (1-to 8-feet-deep) trenches (designated T-1 to T-22) with cumulative length of about 1,510 feet, were excavated and -logged at the Diablo Canyon ISFSI study area to obtain information on bedrock stratigraphy and rock mass properties (Figures D-1 and D-2). The trenches expose marine sedimentary rocks of unit Tofb of the Tertiary Obispo Formation and Holocene colluvium. Discontinuity surveys of joints, fractures and bedding (William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report F), as well as rock mass evaluations (William Lettis & Associates, Inc.,

2001, Diablo Canyon ISFSI Data Report H) were performed in the trenches to obtain information to assess slope stability and in situ rock strength. The preparation of this data report was performed under the 2000 WLA Work Plan (William Lettis & Associates, Inc., Work Plan, 2000) using data collected under that Work Plan and the 2001 WLA Work Plan (William Lettis & Associates, Inc., Work Plan, 2001).

2.0 METHODOLOGY Trenches were excavated with a rubber-tire backhoe or track-mounted excavator (Figure D-3), depending on the competence of the rock encountered. Excavation was easy and rapid in zones of friable, weathered, or closely jointed rock. In more massive rock, excavation was moderately difficult to difficult, and some trenches could not be extended more than 6 inches to 2 feet before meeting refusal. Site geologists supervised the trench excavations, cleaned the trench sidewalls with picks, shovels, and brooms, and logged the exposures. The geologists were Jeff Bachhuber, Charles Brankman, John Helms, John Baldwin and Rich Koehler of William Lettis & Associates, Inc. (WLA). Sedimentary beds and fault contacts, including structural features, were flagged with nails and colored plastic survey tape. Logs of the trench exposures were prepared at scales ranging from 1:40 to 1:160 to document rock lithology, structure, and lithologic contacts and are included in this Data Report. Measurements of bedding, joint, and fault orientations were made with a Brunton compass. Discontinuity surveys were performed in selected trenches by extending a fiberglass survey tape across the trench floor or sidewall, and Diablo Canyon ISFSI D-4 of 66 Data Report D, Rev. 1

measuring the station, attitude and characteristics of discontinuities that intercepted the tape. This information is documented on field data sheets in William Lettis &

Associates, Inc. (2001) Diablo Canyon ISFSI Data Reports F and H. Photographs of the trenches are included as Figures D-4 to D-25. Following the logging of trenches, the ends of the trenches and selected fault zones were surveyed by a licensed land surveyor.

This surveyed data was transmitted by PG&E Geosciences Department to WLA (PG&E Geosciences, 2001).

3.0 RESULTS Rock encountered in the trenches consisted of dolomite, dolomitic siltstone, dolomitic sandstone, and sandstone of the Obispo Formation subunit "b". This subunit was further divided into two other units: Tofb.. dolomite, and Tofb-2 sandstone. The distribution of these rock types is shown on the trench logs. Intervals of friable rock were found in some trenches in the dolomite and sandstone, and are differentiated on the trench logs as friable rock and designated as TOfb-.la and Tofb-2a, respectively. These rock types are described in William Lettis & Associates, Inc. (2001), Diablo Canyon ISFSI Data Report A.

The trenches primarily encountered dolomite in the middle (Tofb-1) and upper parts of the slope above the ISFSI site (e.g., trenches T-2, T-4, T-11), with irregular zones and beds of friable (block-in-matrix) dolomite (TofbIa) (e.g., trenches T-6, T-20). Cemented dolomitic sandstone (Tofb-2a) and friable sandstone (TOfb-2a) were encountered in the trenches along the downhill (northern) margin of the slope at the ISFSI site (e.g., trenches T-1, T-17). Clay beds ranging in thickness up to 4 inches are present in five trenches (trenches T-11, T-12, T-14, T-15; T-19). Of the total 1500 feet of trench exposure at the ISFSI study area, the approximate proportions of rock encountered were dolomite - 69%,

friable dolomite - 12%, sandstone - 8%, friable sandstone - 10%, and shear zones, excavation rubble, and clay beds - 1%.

Five minor bedrock faults were encountered in trenches along the northern (downhill) margin of the site (e.g., trenches T-1, T-17). The faults strike west-northwest, are steeply dipping to vertical, and juxtapose rocks of different lithologies (Figure D-1). The sense of vertical separation generally is down to the northeast. Slickensides generally are subhorizontal. Combined, the sense of vertical separation and slickensides data indicate primarily right lateral strike slip on the minor faults.

Diablo Canyon ISFSI D-5 of 66 Data Report D, Rev. 1

At the end of the study, the lithologic characteristics of the rocks in the trenches were re evaluated and reclassified and the original unit names depicted on the trench logs were corrected to conform with the final stratigraphic nomenclature used for the ISFSI study area. These changes have been noted on the logs in this Data Report.

4.0 REFERENCES

Hartz, C.E., no date, ISFSI Site Investigation DCPP, EDMS Item #993500012, 10 CFR 50 Appendix B, Criterion III, 12 p.

PG&E Geosciences Department, 2001, Memo from William D. Page to Rob Witter of October 26, 2001, Transmittal of additional maps and plans for the DCPP Used Fuel Storage project for Calculation Package GEO.DCPP.01.21, Analysis of bedrock stratigraphy and geologic structure at the DCPP ISFSI Site.

William Lettis & Associates Work Plan, Additional Geologic Mapping, Exploratory Drilling, and Completion of Kinematic Analyses for the Diablo Canyon Power Plant, Independent Spent Fuel Storage Installation Site, Rev. 2, November 28, 2000.

William Lettis & Associates, Inc., Work Plan, Additional Exploratory Drilling and Geologic Mapping for the DCPP ISFSI Site, Rev. 1, September 19, 2001.

William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report A, Rev. 1, Geologic Mapping in the Plant Site Area and ISFSI Study Area.

William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report F, Rev. 1, Field Discontinuity Measurements.

William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report H, Rev. 1, Rock Strength Data and GSI Sheets.

Diablo Canyon ISFSI D-6 of 66 Data Report D, Rev. I

E 1,149,000 Explanation T-3 Exploratory trench, number indicated SFootprint of 500 kV tower E

J Outline of ISFSI Pads I '

Cutslope above, and fill prism west of, ISFSI pads 0

50 100 150 200 t

. I I

I I

I I

I Contour interval = 5 feet DIABLO CANYON ISFSI FIGURE D-1 LOCATION OF EXPLORATION TRENCHES Diablo Canyon ISFSI Data Report D, Rev. 1 D-7 of 66 E 1,148,500

(Roll 01 AR3-25)

Southward view of ISFSI study area in center of photo above raw water reservoir. Outcrops of dolomite mark the borrow area cutslope. Trenches excavated for the ISFSI Site investigation are shown. Trench T-16 is located to the left and off of the photo. Photo obtained prior to excavation of T-22 at approximate location marked on photo.

DIABLO CANYON ISFSI FIGURE D-2 SOUTHWARD VIEW OF ISFSI STUDY AREA Diablo Canyon lSFSI Data Report D, Rev. 1 D-8 of 66

.Ž'S S (Roll 00 JLB-2)

Excavation of trench T-11, view to the south.

DIABLO CANYON ISFSI FIGURE D-3 EXCAVATION OF TRENCH T-1 1, VIEW TO SOUTH Diablo Canyon ISFSI Data Report D, Rev. 1 D-9 of 66

(Roll 00 JLB-1)

Altered sandstone (blue-gray color) and dolomite (tan color at far end of trench) in trench T-1. Hammer and orange stake at top of trench across from geologist mark location of a small fault.

Diablo Canyon ISFSI Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-4 TRENCH T-1, VIEW TO NORTHEAST D-10 of 66

(Roll 00 JLB-1)

Typical blocky dolomite exposed in trench T-2.

Diablo Canyon ISFSI Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-5 TRENCH T-2, VIEW TO NORTHEAST D-11 of 66

(Roll 00 00024.JPG)

Typical blocky dolomite in trench T-3. Excavator could not rip hard rock in trench bottom, and met practical refusal.

Diablo Canyon ISFSI Data Report D, Rev. 1 D-12 of 66 DIABLO CANYON ISFSI FIGURE D-6 TRENCH T-3, VIEW TO THE NORTHEAST

(Roll 00 00027.JPG)

Blocky dolomite in trench T-4 along tower across road.

Diablo Canyon ISFSI Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-7 TRENCH T-4, VIEW TO THE NORTHEAST D-13 of 66

(Roll 00 JLB-2)

Blocky to massive dolomite in trench T-5.

uDaOlo Canyon IS5-Ml uata Report U, Hev. 1 DIABLO CANYON ISFSI FIGURE D-8 TRENCH T-5, VIEW TO NORTH D-14 of 66

(Roll 00 JLB-2)

Massive altered dolomite and blocky dolomite-limestone in trench T-6.

UdUIU C, anyon ISFl-S uDaa Reporl U, Rev. 1 D-15 of 66 DIABLO CANYON ISFSI FIGURE D-9 TRENCH T-6, VIEW TO THE NORTH

(Roll 00 00047.JPG)

Blocky dolomite (tan) and altered sandstone (blue-gray) in trench T-7.

Several small secondary faults are marked by red survey flagging.

Diablo Canyon ISFSI Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-1O TRENCH T-7, VIEW TO THE NORTHEAST D-16 of 66

(Roll 00 00050.JPG)

Dolomite and altered sandstone in trench T-8. Several small secondary faults are marked by red survey flagging.

Diablo Canyon ISFSI Data Report D, Rev. 1 D-17 of 66 DIABLO CANYON ISFSI FIGURE D-11 TRENCH T-8, VIEW TO THE NORTHEAST

(Roll 01 JLB-1)

Sandstone in trench T-9.

DIABLO CANYON ISFSI FIGURE D-12 TRENCH T-9 Diablo Canyon lSFSI Data Report D, Rev. 1 D-18 of 66

(Roll 00 00031.JPG)

Blocky dolomite in trench T-10.

Diablo Canyon ISFSl Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-13 TRENCH T-10, VIEW TO THE SOUTHEAST D-19 of 66

(Roll 01 JLB-1)

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Diablo Canyon ISFSI Data Report D, Rev. 1 D-20 of 66 DIABLO CANYON ISFSI FIGURE D-14 TRENCH T-11

Dolomite in trench T-12.

Diablo Canyon ISFSI Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-15 TRENCH T-12 D-21 of 66

(Roll 00 JLB-4)

Massive to blocky dolomite in trench T-13. Hard rock beds could not be ripped by excavator, limiting depth of trench.

Diablo Canyon ISFSI Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-16 TRENCH T-13, VIEW TO NORTHWEST D-22 of 66

(Roll 00 JLB-3)

Blocky dolomite and clay bed in trench T-14.

DIABLO CANYON ISFSI FIGURE D-17 TRENCH T-1 4, VIEW TO NORTHEAST Diablo Canyon ISFSI Data Report D, Rev. 1 D-23 of 66

(Roll 01 JLB-1)

Blocky dolomite in trench T-15.

Diablo Canyon ISFSI Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-18 TRENCH T-15 D-24 of 66

(Roll 00 00055.JPG)

Thick clay colluvium in trench T-16.

uiaolo uanyon ISFSI uata Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-19 TRENCH T-1 6, VIEW TO THE SOUTH D-25 of 66

(Roll 00 JLB-8)

Distant view of trench T-17. Trench spoil piles show general locations of different rock types encountered at equivalent locations in the trench. Tan rock spoil along the right (near) part of the trench is derived from cemented sandstone. Blue-gray spoil in the middle and distant part of the trench is from altered sandstone. Tan spoil at the far end of the trench is from dolomite.

uiablo Canyon ISIFSI Data Report D, Rev. 1 D-26 of 66 DIABLO CANYON ISFSI FIGURE D-20 TRENCH T-17 (FOREGROUND ALONG RESERVOIR ROAD) VIEW TO THE SOUTHEAST

(Roll 00 JLB-8)

Trenches T-1 7b, and T-18, and T-11, and associated spoil piles. Trench T-17b exposed cemented sandstone of unit Tofb_2, and trenches T-11 and T-18 encountered dolomite of unit Tofb-2. The contact between Tofb-2 and Tofb_ 1 trends subparallel to the slope contours between trenches T-17b and T-18.

Diablo Canyon ISFSI Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-21 TRENCH T-18 (CENTER OF PHOTO)

VIEW TO SOUTHEAST D-27 of 66

(Holl 00 JLB-3)

Blocky to massive dolomite in trench T-19.

Diablo Canyon ISFSI Data Report D, Rev. 1 D-28 of 66 DIABLO CANYON ISFSI FIGURE D-22 TRENCH T-1 9, VIEW TO NORTHWEST

(Roll 00 JGH-2)

Altered dolomite (Tofb-1 a) in trench T-20A. This rock has a block-in-matrix composition, with harder blocks of limestone and dolomite in a silty matrix.

No bedding or joints are evident. A fault contact with unaltered dolomite (Tofb-I) is on the right.

Diablo Canyon ISFSI Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-23 TRENCH T-20A, SOUTH WALL D-29 of 66

Weathered petroliferous shale (dark rock at hammer) in fault contact with dolomite (Tofb-1) (light rock on right side of photo), in trench T-21.

Diablo Canyon ISFSI Data Report D, Rev. 1 D-30 of 66 DIABLO CANYON ISFSI FIGURE D-24 TRENCH T-21A, VIEW TO SOUTHWEST

(MOil JLb ;UUU)

Dolomite in trench T-22.

Diablo Canyon ISFSI Data Report D, Rev. 1 DIABLO CANYON ISFSI FIGURE D-25 TRENCH T-22 D-31 of 66

ATTACHMENT 1 DATA REPORT D FIELD TRENCH LOGS Diablo Canyon ISFSI Data Report D, Rev. 1 D-32 of 66

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