ML033650384

Data Report D, Revision 0, Trenches at the ISFSI Site.

ML033650384
Person / Time
Site:	Humboldt Bay
Issue date:	09/05/2002
From:	Cluff L, Page W, Swan F Geomatrix Consultants, Pacific Gas & Electric Co
To:	NRC/FSME
References
+sisprbs20051109, -RFPFR
Download: ML033650384 (32)

Text

DATA REPORT D TRENCHES AT THE ISFSI SITE HUMBOLDT BAY ISFSI PROJECT PREPARED BY DATE onsultant to:

Frank H. Swan, Ph.D. Geomatrix Consultants. Inc.

Printed Name Organization VERIFIED BY ,@IXŽ(- A DATE

• ~~~~~~~~~~~~~~~~~~~

William D. Page. RG. CEG PG&E Geosciences Dept.

Printed Name Organization APPROVED BY DATE - 6 _e92 2 Lloyd S. Cluff, RG. CEG PG&E Geosciences Dept.

Printed Name Organization

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Humboldt Bay ISFSI D-1 of 32 Data Report D, Rev. 0

DATA REPORT D TRENCHES AT THE ISFSI SITE HUMBOLDT BAY ISFSI PROJECT TABLE OF CONTENTS Page

1.0 INTRODUCTION

............ D-4 2.0 METHODOLOGY ............ D-4 3.0 RESULTS ............ D-5

4.0 REFERENCES

. ............ D-6 List of Photos Photo D-1 Trench GMX-T1, view to the east-southeast.

Photo D-2 View from the center of the ISFSI site looking southwest along old walkway and removed security fence.

Photo D-3 Surveying of geologic contacts in trench GMX-T2.

Photo D-4 Artificial fill, and sand and silt layers of the Upper Hookton Formation in trench GMX-T2 between station 36 ft. and station 44 ft.

Photo D-5 Fracture lined with black compressed rootlets in clayey-silt bed in trench GMX-T2.

Photo D-6 Fractures in Upper Hookton Formation in trench GMX-T2.

Photo D-7 Continuous bedding across bleached fracture in silty clay in trench GMX-T2.

Humboldt Bay ISFSI D-2 of 32 Data Report D, Rev. 0

List of Figures Figure D-l Locations of geologic trenches and borings near the ISFSI site.

Figure D-2 Relict paleosol and upper Hookton Formation deposits exposed in trench GMX-T2.

Figure D-3 Log of trench GMX-TI.

Figure D-4 Detail of stratigraphy in trench GMX-T1 at station 22 feet.

Figure D-5 Log of trench GMX-T2.

Figure D-6 Detail of stratigraphy in trench GMX-T2 at station 45 feet.

Figure D-7 Detail of stratigraphy in trench GMX-T2 at station 153 feet.

List of Attachments Index of Trench Photographs Field Trench Logs Humboldt Bay ISFSI D-3 of 32 Data Report D, Rev. 0

DATA REPORT D TRENCHES AT THE ISFSI SITE HUMBOLDT BAY ISFSI PROJECT

1.0 INTRODUCTION

Two trenches (designated GMX T-1 and GMX T-2), having and average depth of about 16 feet and a cumulative length of 225 feet, were excavated and mapped at the Humboldt Bay ISFSI site during July and August, 2002. The purpose of the trenches was to provide data on the nature and continuity of the Quaternary strata and soils exposed beneath the ISFSI site.

The trenching and preparation of this data report were done under Geomatrix Consultants Work Plan - Geologic Trenches and Test Pits for the Humboldt Bay Power Plant Independent Spent Fuel Storage Installation site (HBPP Procedure Number HB-ISFSI-GEO-7, Revision 0, dated July 12, 2000).

Dr. Frank H. Swan and Mr. Todd Crampton of Geomatrix Consultants, Inc. supervised the excavation of the trenches and mapped the trench-wall exposures. Dr. William D. Page, PG&E Geosciences Department, directed the implementation of the study plan and provided technical review of the work. Dr. Clarence Allen, Dr. Gary Carver and Mr. Lloyd S. Cluff reviewed the trenches and field logs on August 4, 2000.

2.0 METHODOLOGY As shown on Figure D-1, Trench GMX T-1 was located to close the gap between segments of a previous trench (trench WCC-l I-T6a) excavated by Woodward-Clyde Consultants (1980)

(Photo D-1). The gap between the segments of trench WCC-11-T6a coincides with the location of an old security fence that has since been removed (Photo D-2). The combined trenches (WCC-1 1-T6a and GMX T-I) provide continuous coverage along a WNW trend across the ISFSI site (Figure A-1). Trench GMX T-2 crossed the ISFSI site in a NE direction.

Trenches were excavated with a track-mounted excavator and shored at approximately 4-foot intervals using hydraulic "speed-shores." There was some groundwater seepage near the bottom of the trenches, which was pumped daily using an electric "trash" pump and gas powered generator. The trench walls were scraped smooth to remove loose material, smeared Humboldt Bay ISFSI D-4 of 32 Data Report D, Rev. 0

soil and/or scars left by the excavation equipment. Geologic contacts were delineated along one wall of each trench using nails marked with colored plastic flagging. The nail heads were placed flush with the trench wall to minimize surveying error and the nails were placed at sufficiently close intervals along the contacts and structural features so that the surveying measurements accurately depict the geometry of these features. The nail heads were then surveyed by PG&E using a "Total Station" as described in the Geosciences Work Plan entitled "Survey of Geologic Test Pits for the HBPP ISFSI Site" (Photo D-3). The survey points were then plotted and the plot used as a base for the field log. The lithologic contacts and geologic structures were drawn by sketching the relations in the field onto the base using the survey points for control.

The nomenclature used to describe the sedimentary deposits and structures follows standard geologic conventions (e.g., Compton, 1962). In addition, the pedogenic soil profile exposed in the NW wall of trenchGMX-T2 at station 180 ft. was described (Figure D-2) following the nomenclature used by the U.S. Department of Agriculture Soil Survey Staff (1951) as modified by Guthrie and Witty (1982). A detailed description of this soil profile is included on Table A-1 in Humboldt Bay ISFSI Project Data Report A - Geologic Mapping in the ISFSI Area (Geomatrix, 2002a).

A sample of wood was collected from the SE wall of trench GMX-T2 opposite station 173 ft at a depth of 26 ft. below the ground surface. Radiocarbon analysis of the sample provided an age of >45,730 BP. The methodology and analysis are described in Humboldt Bay.ISFSI Project Data Report F - Age Dating of Trench Sample (Geomatrix, 2002b).

More than 140 photographs were taken of the trench wall after the walls had been cleaned and the significant features marked with nails. Attachment D-1 is an index and description of the photographs that were taken. The photographs have been labeled and are part of the project file (Geomatrix File No. 5117.009/9.2.1 through 9.2.6). Selected photographs are included with this Data Report.

3.0 RESULTS Figure D-3 is a log of the south wall of trench GMX-T1. Figure D-4 is a detailed description of the stratigraphy exposed in GMX-T1 at station 22 ft. Figure D-5 is a log of the northwest wall of trench GMX-T2 and Figures D-6 and D-7 are detailed measured sections at stations 45 ft.

and 153 ft. respectively.

Humboldt Bay ISFSI D-5 of 32 Data Report D, Rev. 0

The stratigraphic units observed in trenches GMX-T1 and GMX-T2 match the units reported by Woodward-Clyde (1980) in trench WCC-11-T6a. The deposits consist of stratified sand, silt and clay of the Upper Hookton Formation (Late Pleistocene) overlain by 0 to 5 ft. of artificial fill (Photo D-4). Some weak fractures were observed in the lower part of the trenches (e.g., Photos D-5). In several cases even small amounts of vertical displacement (less than a few millimeters) on individual fractures can be precluded based on the continuity of fine bedding and/or sharp contacts across the fractures (e.g., Photos D-6 and D-7). No displacements were observed, and the lithologic contacts exposed in the trench wall (Photo D-

4) are sharp enough to preclude any vertical displacements larger than about 2 centimeters.

4.0 REFERENCES

Compton, R.R., 1962, Manual of Field Geology: John Wiley and Sons, Inc., New York, 378 p.

Earth Science Associates, 1976-1977, Humboldt Bay Power Plant site geology investigations:

Report Prepared for Pacific Gas and Electric Company, 100 p., 35 figs., 19 plates, plus appendixes A through G.

Geomatrix Consultants, Inc. (Geomatrix), 2002a Geologic mapping in the ISFSI site area:

Humboldt Bay ISFSI Project Data Report A, Revision 0, 33 p.

Geomatrix Consultants, Inc. (Geomatrix), 2002b, Age dating of trench sample - Humboldt Bay ISFSI Site: Humboldt Bay ISFSI Project Data Report F, Revision 0, 14 p.

Guthrie, R.L., and Witty, J.E., 1982, New designations for soil profile horizons and layers and the new Soil Survey Manual: Soil Science Society of America Journal, v. 46, p. 443-444.

Munsell Color Co., 1988, Soil color charts: Baltimore, Maryland.

Ogle, B. A., 1953, Geology of the Eel River Valley area, Humboldt County, California:

Division of Mines, Department of Natural Resources, State of California, Bulletin 164, 128 p.

Pacific Gas and Electric Company Geosciences Department, 2000, Geomatrix Consultants work plan - Geologic Investigation for the Humboldt Bay Power Plant Independent Spent Fuel Storage Installation Site: Work Plan ISFSI-GEO-006, Revision 0, March 23, 2000, 6 p. plus 1 attachement (1 p.) and 1 fig.

Soil Survey Staff, 1951, Soil survey manual: U.S. Department of Agriculture Handbook No.

18, 503 p.

Humboldt Bay ISFSI D-6 of 32 Data Report D, Rev. 0

Woodward-Clyde Consultants, 1980, Evaluation of the potential for resolving the geologic and seismic issues at the HBPP Unit No. 3: Summary to Pacific Gas and Electric Company, San Francisco, 74 p. plus appendixes A through E.

Humboldt Bay ISFSI D-7 of 32 Data Report D, Rev. 0

Photo D-1 Trench GMX-T-1, view east-southeast. View along trench with Humboldt Bay Power Plant in the background. Part of trench GMX-T2 is in the foreground. Photograph FHS-00/8-1

1. 29; taken on August 1, 2000.

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Photo D-2 View from the center of the ISFSI site looking southwest along old walkway and removed security fence. Security fence was removed some time after 1980. Photograph FHS-00/7-4 #2; taken on July 25, 2000 prior to excavating trenches GMX-TI and GMX-T2.

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Photo D-3 Surveying of geologic contacts in trench GMX-T2. View is towards the south. Photograph FHS-00/7-4 #9; taken August 1,2000.

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Fill Photo D-4 Artificial fill overlying sand and silt layers of the Upper Hookton Formation in northwest wall of trench GMX-T2 between station 36 ft. and station 44 ft. Photograph FHS-00/7-4 #19; taken August 1, 2000.

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Photo D-5 Fracture lined with black compressed rootlets in clayey-silt bed in trench GMX-T2. Fracture is at station 40 ft., depth

-11 ft. Photograph FHS-Q0/7-3 #21; taken August 3, 2000.

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Silty Clay Sand Clay Photo D-6 Fractures in Upper Hookton Formation in trench GMX-T2. Fractures are at station -25 ft., depth

-5 ft. Note continuous bedding across fractures 9,

below where they have been bleached in the 0 weathered silty clay. Photograph FHS-00/8-3 #32; taken on August 3, 2000.

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Sand Silty Clay Photo D-7 Continuous bedding across bleached fracture in silty clay in trench GMX-T2. Fractures are

'a at station 30 ft., depth -4 ft. Photograph Fo FHS-00/8-3 #26; taken on August 3, 2000.

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Figure D-1 Locations of geologic trenches and borings near the ISFSI site.

Humboldt Bay ISFSI P" Data Report D, Rev. 0 D-15 of 32 C

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DESCRIPTION OF LITHOLOGIC UNITS Upper Hookton Formation: (Late Pleistocene)

EXPLANATION Unit 7:

__---- Lithologic contact solid line T

7 Silty clay and clayey silt with some fine sand.

v where resolution is less than 2 0 Zco IzI Strong brown (7.5 YR 5/8 dry) with pinkish white (7.5 YR 8/2 dry) coatings along columnar and blocky ped faces; sand content increases with depth; very poorly stratified to massive; strongly /

cm, dashed line where 2-5 cm.

Fracture oxidized; locally contains manganese-oxide nodules.

71V Moderately sorted fine sand with silt and some clay.

Mottled very pale brown (10 YR 7/3 dry) and reddish yellow (7.5 YR 6/8 dry) with light gray (5 Y 7/1) to gray (5 Y 6/1) coatings along ped faces; predominantly subrounded to subangular quartz sand; locally contains stringers of manganese-oxide nodules; A/B indicates transition between A soil horizon, which has been stripped in most places (not mapped), and a Bt soil horizon 7

developed on Unit v.

7111a Silty clay layer at the top of unit 71i1-zz 711, Fining-upward sequence of interbedzded sand and silt.

Dark grayish brown (2.5 YR 4/2) to gray (5 Y 5/2 moist) and strong brown (2.5 YR 5/2 moist) where oxidized; layers of well sorted fine to medium sand interbeded with thin (<1 cm ) lenses of C') silt grading upwards to clayey silt and silty clay; locally contains 0 fine gravel along the basal contact; locally contains woody material.

lI 71, Silt interbedded with some fine sand and clayey silt.

Dark gray; massive to weakly stratified layers of sandy silt and clayey silt with some lenses of fine sand and silty clay; bedding is c'a discontinuous laterally.

71 Silty clay.

0~z Dark gray; generally massive.

90 Figure D-3 Log of trench GMX-TI. See Figure D-l for location of trench.

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Station numbers in feet.

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20 30 Fill - Poorly sorted sand, silt and clay.

Contains fine roots; irregular blocky structure.

Unit 7v - Silty clay with tine sand. Strong brown 40- (7.5 YR 5/8) with pinkish white (7.5 YR 8/2) coatings along columnar and blocky ped faces.

Very stiff to hard; very poorly stratified to

-12 massive; open dessication cracks; abundant manganese-oxide flecks locally.

Unit has - Manganese-oxide Horizon numerous open dessicalion cracks (5 1/2") Unit 71v - Moderately sorted fine sand with silt.

Predominantly yellowish brown (10 YR 5/6) with light gray (5 Y 7/1) to gray (5 Y 6/1) mottling.

Strong Sand grains are subrounded to subangular; Oxidation predominantly quartz; massive. Locally contains manganese-oxide nodules. Strongly oxidized in most places; locally reduced. blocky ped faces.

-j Very sharp Very stiff to hard;very poorly stratified to

-j wavy to planar- massive; open dessication cracks; abundant

-j contact manganese-oxide flecks at basal contact.

_-J 11 0) 0 7 2a) (0 Unit 111 - Interbedded medium to fine sand and silt.

0 :E Diffuse Color varies from grayish brown (2.5 Y 5/2) to dark

-o co grayish brown (2.5 Y 4.2) to gray (5 Y 5.1) 1o strong a, Contact (D brown (7.5 YR 5/8). Base of unit is predominantly E well-sorted, medium sand with thin (< 1/4") silt e

C stringers; some fine gravel at basal contact; unit a) 02 fines upwards to silty clay and clayey silt. Sand C

a) layers are generally massive. Upper part contains abundant grass and rootlets in sub-vertical position (buried marsh grass).

Sharp Unit 7111a - Silty clay layer at the top of unit 7111.

II Contact Strong brown (7.5 YR 5/8) with some gray

-10 mottling (5 Y 6/1). Strongly oxidized. Locally Strong contains manganese-oxide nodules.

Oxidation Sharp Wavy II Contact Unit 711 - Predominantly massive silt with fine sand and some clay. Dark gray (5 Y 4.1) to dark Sharp/ greenish gray (5 GY 4/1). Locally contains Contact sandy and clayey beds that are laterally discontinuous. Abundant grass/rootlets in sub-vertical position (buried marsh grass). Locally contains near-vertical fractures that are lined with 30- 111 Zr4L plant material or fine sand.

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C) q Figure D-4 Detail of straligraphy in trench GMX-T1 at station 22 feet.

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THIS PAGE IS AN OVERSIZED DRAWING OR FIGURE, THAT CAN BE VIEWED AT THE RECORD TITLED:

FIGURE D-5 "HUMBOLDT BAY ISFSI DATA REPORT D", REV. 0 WITHIN THIS PACKAGE D-01

50 40

\tV I Ii 4:t -- Fill - Poorly sorted sand, silt and clay. Contains fine roots; Irregular contact; _ -

locally sharp and planar Unit 71v - Moderately sorted fine sand with silt.

40 Predominantly yellowish brown (10 YR 5/6) with light gray (5 Y 7/1) to gray (5 Y 6/1) mottling. Sand grains are 12 subrounded to subangular; predominantly quartz; massive.

Locally contains manganese-oxide nodules. Strongly oxidized in most places; locally reduced.

very Sharp wavy-contact Unit 7tia - Silty clay layer at the top of unit 7111.Strong brown (7.5 YR 5/8) with some gray mottling (5 Y 6/1).

Strongly oxidized. Locally contains manganese-oxide Gradational- nodules.

Oxidized contact Reduced Very sharp- .

oxidation/

reducation Unit 7111-Interbedded medium to fine sand and silt.

-j boundary Color varies from grayish brown (2.5 Y 5/2) to dark grayish brown (2.5 Y 4.2) to gray (5 Y 5.1) to strong J brown (7.5 YR 5/8). Base of unit is predominantly well-

- -11 CD 0 sorted, medium sand with thin (< 1/4") silt stringers; 0 .0 some fine gravel at basal contact locally; fines upwards

.0 to silty clay and clayey silt. Sand layers are generally (D

a,q massive. Upper part contains abundant grass and W Very sharp > rootlets in sub-vertical position (buried marsh grass).

E wavy to planar Locally contains woody plant material.

r_ contact

.2 0 (0 Unit 7i1 - Predominantly massive silt with fine sand and some clay. Dark gray (5 Y 4.1) to dark greenish gray LUi (5 GY 4/1). Locally contains sandy and clayey beds that are laterally discontinuous. Abundant grass/rootlets in sub-vertical positions (buried marsh grass). Locally contains

-10 near-vertical fractures that are lined with plant material or fine sand.

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to abrupt wavy Unit 71 - Predominantly silty clay. Dark gray.

1 to planar contact Massive, firm to soft.

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S co Figure D-6 Detail of stratigraphy in trench GMX-T2 at station 45 feet.

To 53 Humboldt Bay ISFSI ri2 OIaf Data Report D, Rev. 0 D-20 of 32

160 150 IV, N (,)I Fill - Poorly sorted sand, silt and clay.

-13 a i- Contains fine roots; irregular blocky structure.

Unit 7v - Silty clay with fine sand. Strong brown (7.5 YR 5/8) with pinkish white (7.5 YR 8/2) coatings along columnar and blocky ped faces.

Very stiff to hard;very poorly stratified to massive; open dessication cracks; abundant manganese-oxide flecks locally.

40-

-12

§  ; Oxidtic

~j Very sharp Unit 7111 - Interbedded medium to fine sand and 13E wavy Io planar" silt. Color varies from grayish brown (2.5 Y 5/2) to 11 a) contac dark grayish brown (2.5 Y 4.2) to gray (5 Y 5.1) to 2 0 7777'. strong brown (7.5 YR 5/8). Base of unit is

.0 predominantly well-sorted, medium sand with thin

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(< 114") silt stringers; some fine gravel at basal contact. Unit fines upwards to silty clay and EQ) clayey silt. Sand layers are generally massive.

Upper part contains abundant grass and rootlets ems E 4_

in sub-vertical position (buried marsh grass).

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Lj 7-t Locally contains woody plant material.

CL

.2 DD Unit 711- Predominantly massive silt with fine sand

-10 4,3 and some clay. Dark gray (5 Y 4.1) to dark greenish gray (5 GY 4/1). Locally contains sandy and clayey beds that are laterally discontinuous.

?4s I Abundant grass/rootlets in sub-vertical positions

. Room (buried marsh grass).

30-

-9 \ _ Shore 00 CL

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5

'20 0It 01 CIA Gradational to - -----------

9 abrupt planar Unit 71-- Predominantly silty clay. Dark R contact gray. Massive, firm to soft.

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Figure D-7 Detail of stratigraphy in trench GMX-T2 at station 153 feet.

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ATTACHMENT 1 HUMBOLD BAY ISFSI PROJECT DATA REPORT D INDEX OF TRENCH PHOTOGRAPHS (Photographs are in PG&E files)

Humboldt Bay ISFSI Page D-22 of 32 Data Report D, Rev. 0

Attachment 1 Index of Trench Photographs Humboldt Bay ISFISI Project Roll I Frame Description Photograph Date I No. No. By I FHSOO/7-4 0 ISFSI Site prior to trenching, view is to the NW F.H. Swan 25/7/00 1 ISFSI Site prior to trenching, view is to the E along F.H. Swan 25/7/00 the alignment of trenches GMX-T1 and WCC 11 -T6a HBPP in background 2 ISFSI Site prior to trenching, view is to the E along F.H. Swan 25/7/00 the the old security fence (now removed), white stripes indicate location of trench GMX-T1 where it will fill the gap in trench WCC 1IT6a 3 ISFSI Site; view from center of site to the SW along F.H. Swan 25/7/00 the alignment of trench GMX-T2 (prior to trenching) 4 ISFSI Site; view from center of site to the NE along F.H. Swan 25/7/00 the alignment of trench GMX-T2 (prior to trenching) 9 Surveying lithologic contacts in trench GMX-T2 F.H. Swan 1/8/00 10 Trench GMX-T2, view to the SW F.H. Swan 1/8/00 11 Label identifying next series of Photos; F.H. Swan 1/8/00 "HBPP ISFSI Site trench GMX-T2, NW wall"

[stations are in feet measured from NE end of trench]

12 Trench GMX-T2, NW wall, station 0 to -5 ft. F.H. Swan 1/8/00 13 Trench GMX-T2, NW wall, station - 5 to 13 ft. F.H. Swan 1/8/00 14 Trench GMX-T2, NW wall, station - 12 to 19 ft. F.H. Swan 1/8/00 15 Trench GMX-T2, NW wall, station - 15 to 23 ft. F.H. Swan 1/8/00 16 Trench GMX-T2, NW wall, station - 22 to 29 ft. F.H. Swan 1/8/00 17 Trench GMX-T2, NW wall, station - 26 to 33 ft. F.H. Swan 1/8/00 18 Trench GMX-T2, NW wall, station - 31 to 39 ft. F.H. Swan 1/8/00 19 Trench GMX-T2, NW wall, station - 36 to 44 ft. F.H. Swan 118/00 20 Trench GMX-T2, NW wall, station - 44 to 49 ft. F.H. Swan 1/8/00 21 Trench GMX-T2, NW wall, station - 47 to 56 ft. F.H. Swan 1/8/00 22 Trench GMX-T2, NW wall, station - 52 to 57 ft. F.H. Swan 1/8/00 23 Trench GMX-T2, NW wall, station - 56 to 64 ft. F.H. Swan 1/8/00 24 Trench GMX-T2, NW wall, station - 61 to 68 ft. F.H. Swan 1/8/00 25 Trench GMX-T2, NW wall, station - 64 to 71 ft. F.H. Swan 1/8/00 26 Trench GMX-T2, NW wall, station - 68 to 79 ft. F.H. Swan 1/8100 27 Trench GMX-T2, NW wall, station - 75 to 81 ft. F.H. Swan 1/8/00 28 Trench GMX-T2, NW wall, station - 78 to 86 ft. F.H. Swan 1/8/00 29 Trench GMX-T2, NW wall, station - 82 to 88 ft. F.H. Swan 1/8/00 30 Trench GMX-T2, NW wall, station - 86 to 93 ft. F.H. Swan 1/8/00 31 Trench GMX-T2, NW wall, station - 91 to 97 ft. F.H. Swan 1/8/00 32 Trench GMX-T2, NW wall, station - 93 to 100 ft. F.H. Swan 1/8/00 33 Trench GMX-T2, NW wall, station - 98 to 105 ft. F.H. Swan 1/8/00 34 Trench GMX-T2, NW wall, station - 101 to 108 ft. F.H. Swan 1/8100 35 Trench GMX-T2, NW wall, station - 102 to 110 ft. F.H. Swan 1/8/00 36 Trench GMX-T2, NW wall, station - 108 to 114 ft. F.H. Swan 1/8/00 37 Trench GMX-T2, NW wall, station - 111 to 118 ft. F.H. Swan 1/8/00 Humboldt Bay ISFSI Page D-23 of 32 Data Report D, Rev. 0

Attachment 1 Index of Trench Photographs Humboldt Bay ISFISI Project Roll Frame Description Photograph Date No. I No. I By l FHSOO/8-1 2 Label identifying next series of photos in trench GMX-T2 F. H. Swan 1/8/00 All 3 NW wall trench GMX-T2; -station 114 to 122 ft. F.H. Swan 1/8/00 All 4 NW wall trench GMX-T2; -station 118 to126 ft. F.H. Swan 1/8/00 5 NW wall trench GMX-T2; -station 123 to 129 ft. F.H. Swan 1/8/00 1l 6 NW wall trench GMX-T2; -station 125 to 133 ft, F. H. Swan 1/8/00 1l 7 NW wall trench GMX-T2; -station 129 to 137 ft. F.H. Swan 1/8/00 8 NW wall trench GMX-T2; -station 133 to 138 ft. F. H. Swan 1/8/00 9 NW wall trench GMX-T2; -station 135 to 142 ft. F.H. Swan 1/8/00

., 10 NW wall trench GMX-T2; -station 139 to 146 ft. F.H. Swan 1/8/00 1l 11 NW wall trench GMX-T2; -station 143 to 149 ft. F.H. Swan 1/8/00

.l 12 NW wall trench GMX-T2; -station 145 to 152 ft, F.H. Swan 1/8/00 13 NW wall trench GMX-T2; -station 148 to 156 ft. F.H. Swan 1/8/00

.. 14 NW wall trench GMX-T2; -station 153 to 159 ft. F.H. Swan 1/8/00 15 NW wall trench GMX-T2; -station 155 to 162 ft. F.H. Swan 1/8/00 1l 16 NW wall trench GMX-T2; -station 159 to 166 ft. F.H. Swan 1/8/00 1l 17 NW wall trench GMX-T2; -station 163 to 168 ft. F.H. Swan 1/8/00 1l 18 NW wall trench GMX-T2; -station 167 to 173 ft. F.H. Swan 1/8/00 19 NW wall trench GMX-T2; -station 170 to 177 ft. F.H. Swan 1/8/00 20 NW wall trench GMX-T2; -station 173 to 178 ft. F.H. Swan 1/8/00 11 21 NW wall trench GMX-T2; -station 176 to 184 ft. F.H. Swan 1/8/00 22 NW wall trench GMX-T2; -station 185 to 188 ft F.H. Swan 1/8/00 23 NW wall trench GMX-T2; -station 185 to 192 ft. F.H. Swan 1/8/00

.. 24 NW wall trench GMX-T2; -station 190 to 197 ft. F.H. Swan 1/8/00 25 NW wall trench GMX-T2; -station 195 to 200 ft. F.H. Swan 1/8/00

.. 26 Trench GMX-T2, view to the north from southern F.H. Swan 1/8/00 1l end of trench

.l 27 Trench GMX-T2, view to the north from near F.H. Swan 1/8/00 southern end of trench 28 ISFSI site, view to the NE F.H. Swan 1/8/00 29 Trench GMX-1, view to the E towards plant from W F.H. Swan 1/8/00 end of trench, 30 View to the Ne from near the center of the ISFSI site, F. H. Swan 1/8/00

.. north half of trench GMX-T2 in foreground 31 Surveying the trenches, view to the ESE F.H. Swan 1/8/00 32 Surveying the trenches, view to the ESE F.H. Swan 1/8/00 33 Intersection of boring in E wall of trench GMX-T2; F.H. Swan 1/8/00 opposite - station 30 ft. (i.e., - 30 ft. from N end of trench) 34 Intersection of boring in E wall of trench GMX-T2; F.H. Swan 1/8/00 opposite - station 30 ft. (i.e., - 30 ft. from N end of trench) 35 label identifying film roll no. (FHS 00/8-1) F. H. Swan 1/8/00 36 stake indicating location of boring opposite station 30 ft. F.H. Swan 1/8/00 37 Fractures (& undisturbed bedding below fractures) F.H. Swan 1/8/00 exposed in NW wall of trench GMX-2 betwee stations 23-25 ft.

Humboldt Bay ISFSI Page D-24 of 32 Data Report D, Rev. 0

Attachment 1 Index of Trench Photographs Humboldt Bay ISFISI Project Roll Frame Description Photograph l Date No. No. By I I FHSO0/8-2 1 label identifying film roll no. (FHS 00/8-2) F.H. Swan 1/8/00 It 2 Cave-in where trench GMX-T2 intersected backfill in F.H. Swan 1/8/00 trench WCC 11 -T6a "t 3 to 12 Sequence of photos showing vertical profile of deposits F.H. Swan 1/8/00 exposed in trench GMX-T2 at station 180 ft (NW wall);

[0.5 to 14.6 ft. depth]

13 Label identifying next sequence of photos of F.H. Swan 1/8/00 trench GMX-T-1 (south wall) 14 Trench GMX-T1 (south wall), station 0 to 5 ft. F.H. Swan 118/00 15 Trench GMX-T1 (south wall), station - 5 to 10 ft. F.H. Swan 1/8/00 16 Trench GMX-T1 (south wall), station - 10 to 15 ft. F.H. Swan 1/8/00 17 Trench GMX-T1 (south wall), station - 13 to 19 ft. F.H. Swan 1/8/00 18 Trench GMX-T1 (south wall), station - 16 to 23 ft. F.H. Swan 1/8/00 19 Trench GMX-T1 (south wall), station - 19 to 25 ft. F.H. Swan 1/8/00 20 Trench GMX-T1 (south wall), station - 21 to 27 ft. F.H. Swan 1/8/00 21 Trench GMX-T1 (south wall), station - 25 to 31 ft. F.H. Swan 1/8/00 22 Trench GMX-T1 (south wall), station - 27 to 33 ft. F.H. Swan 1/8/00 23 Trench GMX-T1 (south wall), station - 30 to 37 ft. F.H. Swan 1/8/00 24 Trench GMX-T1 (south wall), station - 33 to 39 ft. F.H. Swan 1/8/00 25 Trench GMX-T1 (south wall), station - 36 to 44 ft. F.H. Swan 1/8/00

,, 26 Trench GMX-T1 (south wall), station - 40 to 46 ft. F.H. Swan 1/8/00 27 Trench GMX-T1 (south wall), station - 41 to 49 ft. F.H. Swan 1/8/00 28 Trench GMX-T1 (south wall), station - 46 to 50 ft. F.H. Swan 1/8/00 "1 29 Trench GMX-T1, view to the W F.H. Swan 118/00 Id 30 to 37 Sequence of photos showing vertical profile of deposits F.H. Swan 1/8/00 expsoed in trench GMX-T1 at station 20 ft (S wall); to a depth of 11.9 ft; (scale in feet and tenths of feet)

Humboldt Bay ISFSI Page D-25 of 32 Data Report D, Rev. 0

Attachment 1 Index of Trench Photographs Humboldt Bay ISFISI Project Roll Frame Description Photograph Date I No. No. I By l I FHSOO/8-3 1 Soil Profile, trench GMX-T2, - station 190 ft., NW wall F.H. Swan 3/8/00 2 Soil Profile, trench GMX-T2, - station 190 ft., NW wall F.H. Swan 3/8/00 3 Soil Profile, trench GMX-T2, - station 1 90 ft., NW wall, F.H. Swan 3/8/00 4 Soil Profile, trench GMX-T2, - station 190 ft., NW wall, F.H. Swan 3/8/00 (poor exposure) 5 to 9 Poor exposures - photos, not printed or discarded F.H. Swan 3/8/00 10 Label - Trench GMX-T2, Station 80 feet (W) wall F.H. Swan 3/8/00 11 to 14 Negatives not printed ?? F.H. Swan 3/8/00 I..

15 Continuous lithologic contact overlying fractures near F.H. Swan 3/8/00 station 40 ft, NW wall of trench GMX-T2, view is towards the SW 16 Continuous lithologic contact overlying fractures F.H. Swan 3/8/00 opposite station 80 ft exposed in E wall of trench GMX-T2, view is towards the SW 17 Negatives not printed -- same view as frame 18 F.H. Swan 3/8/00 18 Label - Trench GMX-T2, Station 40 feet (W) wall F.H. Swan 3/8/00 19 to 21 Fractures lined with black roots at station 40 ft, F.H. Swan 3/8/00 trench GMX-T2, NW wall ft 22 to 24 Continuous lithologic contacts overlying fractures near F.H. Swan 3/8/00 station 80 ft exposed in E wall of trench GmX-T2, view is towards the SW 25 Label - Trench GMX-T2, Station 30 feet (W) wall F.H. Swan 3/8/00 26 to 28 Short fracture line with greasy silt in clayey silt overlain F.H. Swan 3/8/00 by well sorted sand, the contact between the clayey silt and the sand is not displaced and the fracture cannot be traced into the overlying sand; NW wall of trench GMX-T2 at station 30 ft.

29& 30 Fractures lined with gray silt ovlerlain by backfill in F.H. Swan 3/8/00 ESA trench BP-1, NW wall of trench GMX-T2 at station - 25 ft., Quarter for scale 31 to 33 Continuity of strata below fractures lined with F.H. Swan 3/8/00 grey silt, NW wall of trench GMX-T2 at station - 25 ft.

34 Trench GMX-T1, view to the E towards HBPP F.H. Swan 3/8/00 35 SW half of trench GMX-T2, view to the S F.H. Swan 3/8/00 36 & 37 Back fill in trench WCC 11 -T6a exposed in NW wall F.H. Swan 3/8/00 of trench GMX-T2, - station 110 ft.

Humboldt Bay ISFSI Page D-26 of 32 Data Report D, Rev. 0

ATTACHMENT 2 HUMBOLDT BAY ISFSI SITE DATA REPORT D FIELD TRENCH LOGS Humboldt Bay ISFSI Page D-27 of 32 Data Report D, Rev. 0

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