ML020300398
| ML020300398 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 12/21/2001 |
| From: | Lettis W R, Womack L F Pacific Gas & Electric Co, William Lettis & Associates |
| To: | Document Control Desk, Office of Nuclear Material Safety and Safeguards |
| References | |
| +sispmjr200505, -nr, -RFPFR, DIL-01-005 | |
| Download: ML020300398 (107) | |
Text
Lawrence F. Womack Vice President Nuclear Services December 21, 2001 Diablo Canyon Power Plant PO. Box 56 Avila Beach, CA 93424 805.545.4600 Fax: B05.545.4234 PG&E Letter DIL-01-005 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 72-26 Diablo Canyon Independent Spent Fuel Storage Installation Submittal of Geologic Data Reports Dear Commissioners and Staff: By letter dated December 21, 2001, Pacific Gas and Electric Company (PG&E) submitted an application to the Nuclear Regulatory Commission (NRC) requesting a site-specific license for an Independent Spent Fuel Storage Installation (ISFSI) at the Diablo Canyon Power Plant (DCPP). The application included a Safety Analysis Report, Environmental Report, and other required documents in accordance with 10 CFR 72. To support NRC review of the geologic characteristics of the ISFSI site, enclosed is a series of 11 data reports (A through K) prepared for PG&E by William Lettis & Associates, Inc. If you have any questions regarding these reports, please contact Mr. Terence Grebel at (805)595-6382.
Siney, ( 0 Lawrence F. Womack cc: Timothy J. Kobetz Ellis W. Merschoff David L. Proulx Girija S. Shukla wlo Enclosure David A. Repka Brian Gutherman w/o Enclosure Thomas A. Moulia w/o Enclosure Roy B. Willis w/o Enclosure Diablo Distribution w/o Enclosure po Enclosure Ith'JI Pacific Gas and Electric Company Enclosure PG&E Letter DIL-01-005 Sheet 1 of 1 LIST OF ATTACHED ISFSI DATA REPORTS Diablo Canyon ISFSI Data Report A -Geologic Mapping in the Plant Site and ISFSI Site Areas, Rev. 1, December 17, 2001 Diablo Canyon ISFSI Data Report B -Borings in ISFSI Site Area, Rev. 1, December 17, 2001 Diablo Canyon ISFSI Data Report C -1998 Geophysical Investigations at the ISFSI Site Area (Agbabian Associates and GeoVision), Rev. 1, December 17, 2001 Diablo Canyon ISFSI Data Report D -Trenches in the ISFSI Site Area, Rev. 1, December 17, 2001 Diablo Canyon ISFSI Data Report E -Borehole Geophysical Data (NORCAL Geophysical Consultants, Inc.), Rev. 0, November 5, 2001 Diablo Canyon ISFSI Data Report F -Field Discontinuity Measurements, Rev. 1, December 17, 2001 Diablo Canyon ISFSI Data Report G -Soil Laboratory Test Data (Cooper Testing Laboratory), Rev. 1, December 17, 2001 Diablo Canyon ISFSI Data Report H -Rock Strength Data and GSI Sheets, Rev. 0, November 5, 2001 Diablo Canyon ISFSI Data Report I -Rock Laboratory Test Data (GeoTest Unlimited)
Rev. 1, December 17, 2001 Diablo Canyon ISFSI Data Report J -Petrographic Analysis and X-Ray Diffraction of Rock Samples (Spectrum Petrographics, Inc.), Rev. 0, November 5, 2001 Diablo Canyon ISFSI Data Report K -Petrographic and X-Ray Diffraction Analyses of Clay Beds (Schwein/Christensen Laboratories, Inc.), Rev. 0, November 5, 2001 GEOLOGIC DATA REPORTS Book I of 4 Attachments to PG&E Letter DIL-01-004 Dated December 21, 2001 DATA REPORT A GEOLOGIC MAPPING IN THE PLANT SITE AREA AND ISFSI STUDY AREA DIABLO CANYON ISFSI PREPARED BY VERIFIED BY APPROVED BY William R. Lettis Printed Name DATE DATE Scott C. Lindvall Printed Name -a /" / "-, DATE William D. Page Printed Name William Lettis & Associates, Inc. Organization 127/ 71L61 William Lettis & Associates, Inc. Organization PG&E Geosciences Dept. Organization Diablo Canyon ISFSI Data Report A, Rev. 1 A-1 of 42 DATA REPORT A GEOLOGIC MAPPING IN THE PLANT SITE AREA AND ISFSI STUDY AREA DIABLO CANYON ISFSI Table of Contents Page 1.0 Introduction
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A -4 2.0 M ethodology
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A -5 3.0 R esults ..............................................................................................................
A -7 3.1 Stratigraphy
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A -7 3.1.1 Stratigraphy of the Plant Site Area ..........................................
A-7 3.1.1.1 Geomorphology and Quaternary Geology .........
A-9 3.1.1.2 M arine Terraces .........................................................
A -10 3.1.1.3 Inland Quaternary Deposits ...................................
A-1I 3.1.2 Stratigraphy of the ISFSI Study Area ....................................
A-13 3.2 Structure
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A -14 4.0 R eferences
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A -15 List of Photos Photo A-1. Aerial view of the ISFSI study area Photo A-2. Southward view of the ISFSI and CTF sites and transport route Photo A-3. Measuring bedding attitude, ISFSI study area Photo A-4. Weathered diabase on Diablo Creek Road Photo A-5. Transport route near Patton Cove landslide Photo A-6. Southward view of ISFSI study area Photo A-7. Weathered sandstone, unit Tofb-2, on Reservoir Road Photo A-8. Sandstone of the Obispo Formation in Trench T- 17 Photo A-9. Well-bedded dolomite, unit Tofb-l, on Reservoir Road Photo A-I10. Close up view of well-bedded dolomite on Reservoir Road Diablo Canyon ISFSI Data Report A, Rev. 1 A-2 of 42 Table of Contents (continued)
List of Photos (continued)
Photo A- 11. Massive dolomite in Trench T-5 Photo A-12. Friable sandstone in Trench T-1 Photo A-13. Friable dolomite, unit Tofb-la, in Trench T-20A Photo A-14. Dolomite (Tofb- 1) and clay beds in Trench T-1 IC Photo A- 15. Thin clay bed and fracture in Trench T- 14A Photo A-16. Clay bed in Trench T-14B Photo A-17. Obispo Formation dolomite and sandstone on hillslope above Reservoir Road Photo A- 18. Fault in Trench T- 1 Photo A-19. Typical small bedrock faults in Trench T-1 Photo A-20. Friable dolomite in fault contact with dolomite in Trench T-6 Photo A-2 1. Fault zone in Trench T-21 Photo A-22. 1968 aerial photograph of ISFSI study area Photo A-23. Faults in Diablo Creek Road cut List of Figures Figure A-I Geologic map of bedrock and landslides in the plant site area Figure A-2 Geologic map of the ISFSI site and transport route vicinity Figure A-3 Geologic map of ISFSI and CTF sites Diablo Canyon ISFSI A-3 of 42 Data Report A, Rev. 1 DATA REPORT A GEOLOGIC MAPPING IN THE PLANT SITE AREA AND ISFSI STUDY AREA DIABLO CANYON ISFSI
1.0 INTRODUCTION
Geologic mapping was performed to characterize the stratigraphic and structural setting of the ISFSI study area (the area within the 1971 borrow excavation boundary).
The ISFSI and CTF sites are located within a previously-excavated borrow area (excavated in 1971) along the nose of a prominent bedrock ridge between Diablo Canyon and the coast (Photos A-I and A-2). Information on the site stratigraphy and structure was used for three purposes:
(1) to evaluate foundation properties for the ISFSI pads and the CTF; (2) to evaluate stability of the proposed cut slopes and existing hillslope above the ISFSI pads and transport route; and (3) to compare bedrock conditions at the ISFSI site to bedrock conditions beneath the DCPP power block for ground motion characterization.
Results of the geologic mapping are provided in this Data Report. The geologic mapping focused on identifying and characterizing bedrock lithology, bedding attitudes, rock mass properties, and geologic structures including faults and folds. These data are compiled on topographic maps covering the plant site area (the area within the PG&E DCPP site boundary) (Figure A-i), ISFSI study area and transport route (Figure A-2), and the ISFSI study area (Figure A-3). These maps and supplemental survey data were transmitted to WLA by PG&E Geosciences Department (2001 a, b, and c). These maps synthesize data from the ISFSI site investigations and previous geologic and geotechnical studies presented in the FSAR (PG&E, 2000), LTSP (PG&E, 1998) and published geological maps (e.g., Hall, et al., 1979; Hanson et al., 1994). Mapping for the assessment of the DCPP ISFSI, CTF, and transport route was performed in and near the ISFSI study area over a period of four years, between 1998 and 2001. The surface mapping was augmented by trenches in the ISFSI study area (Diablo Canyon ISFSI Data Diablo Canyon ISFSI A-4 of 42 Data Report A, Rev. 1 Report D), subsurface borehole data (Diablo Canyon ISFSI Data Report B), and geophysical downhole surveys and seismic refraction surveys (Diablo Canyon ISFSI Data Reports C and E). Hand samples of bedrock from surface exposures were analyzed petrographically and by X-ray diffraction to help confirm lithology and mineralogy of the stratigraphic units (Diablo Canyon ISFSI Data Reports J and K). Mapping at the ISFSI study area was performed by Patrick Drouin (1998), Gary Simpson (1998), Charles Brankman (2000, 2001), Rich Koehler (2000, 2001) Kristin Weaver (2001), Jeff Bachhuber (1998, 2000, 2001), and William Lettis (1998, 2000, 2001) of William Lettis & Associates, Inc. (WLA), under the project supervision of William Page of PG&E Geosciences.
Mapping elsewhere in the plant site area also was performed by Jeff Bachhuber and William Lettis (1993-2001).
The geologic mapping and preparation of this data report was performed under the 2000 Work Plan (William Lettis & Associates, Inc., 2000) using data collected under that Work Plan and the 2001 Work Plan (William Lettis & Associates, Inc., 2001). Some of the geologic mapping was done during the investigations performed in 1998. These earlier data have been accepted by the Diablo Canyon ISFSI Project by C.E. Hartz (EDMS Item #993500012), 10 CFR 50, Appendix B, Criterion II). 2.0 METHODOLOGY Geologic mapping for the ISFSI site was performed following generally accepted techniques (e.g., Compton, 1985) in compliance with the WLA work plans cited above. Geologic mapping was based on examination of natural outcrops, roadcuts, borrow excavation cuts, twenty-two trenches, and core from seventeen borings. Locations of bedrock exposures and bedding and fault attitudes in the ISFSI study area were located on topographic maps using several methods, including Global Positioning System (GPS), compass triangulation, and Brunton compass and tape. Elsewhere in the plant site area, locations were determined by topographic inspection.
Locations of field data collected during May 2001 in the ISFSI study area were verified by GPS points taken in the field Diablo Canyon ISFSI A-5 of 42 Data Report A, Rev. I and later compiled in the office to provide accurate locations of these data points. Data were plotted on topographic base maps at scales ranging between 1:24,000 and 1:600. Measurements of bedding, fault and joint orientations (strike and dip) were made using a Brunton compass (Photo A-3). Particular care was used in locating and measuring bedding in the ISFSI study area because of the importance of bedding attitude to the analysis of potential slope stability.
Bedding attitudes measured in surface exposures were obtained on bedding planes with clear textural or stratigraphic evidence of bedding.
Bedding planes were confirmed and differentiated from joint planes by consistent stratification and bed-parallel laminations.
Some well-defined bedding planes were exposed by splitting rock along beddings controlled parting planes using a rock hammer. Bedding orientation measurements included qualitative ratings of both the level of confidence that the measured plane was representative of bedding and of the quality of the surface for determining an accurate strike and dip measurement.
In some cases, shallow bedding dips made measurement difficult; in these cases, several measurements were made by each of at least two geologists and discussed before selecting representative values. Surface measurements of bedding attitudes and fault orientations in the ISFSI study area were subsequently independently checked and verified in the field by at least two geologists.
In a few cases, where bedding orientations at specific outcrops could not be independently verified by other geologists in subsequent phases of field work, these disputed and/or non-verified measurements were removed from the data base, or kept in the data base after they had been screened for quality and consistency with nearby verified data. Bedding attitudes elsewhere in the plant site area were compiled from pre-existing sources, including the FSAR (PG&E, 2000), the LTSP (PG&E, 1988, 1991), the DCPP Slope Stability Study (PG&E, 1998), and Hall et al. (1979), and spot checked after examining the general consistency of the bedding measurements.
The accuracy of bedding strike and dip measurements is on the order of +5°. Diablo Canyon ISFSI A-6 of 42 Data Report A, Rev. 1
3.0 RESULTS
Results from the geologic mapping are presented on three geologic maps: (1) plant site area; (2) ISFSI site and transport route vicinity; and (3) ISFSI and CTF study areas (Figures A-I, A-2, and A-3, respectively).
Geologic mapping in the ISFSI study area progressed from reconnaissance mapping of the entire plant site area, to progressively more focussed field mapping of the ISFSI and CTF sites and the transport route. From 1993 to 1998, lithologic and structural data were compiled from pre-existing documents, field checked, and supplemented by additional reconnaissance mapping. Particular emphasis was given to compiling and verifying geologic data from the DCPP FSAR (PG&E, 2000), LTSP (PG&E 1988; 1991), Hall et al. (1979), Hanson et al. (1994) and Lettis et al. (1992). Existing data were integrated with the additional reconnaissance mapping to prepare a geologic map of the plant site area (Figure A-1). In 1998, 2000, and 2001, more detailed mapping and subsurface site exploration were performed in the ISFSI study area. These investigations resulted in detailed geologic maps of the entire ISFSI study area and transport route (Figure A-2) and of the ISFSI study area (Figure A-3). 3.1 Stratigraphy
3.1.1 Stratigraphy
of the Plant Site Area Results of the geologic mapping show that the plant site area is underlain by bedrock of the early and middle Miocene Obispo Formation (map unit Tof), and locally by middle Miocene diabase intrusions (map unit Tvr) (Hall et al., 1979; PG&E, 1988, Chapter 2). Geologic studies for the original DCPP FSAR (PG&E, 1978; updated, 2000) originally classified bedrock at the power plant site as strata from the middle and late Miocene Monterey Formation.
Subsequent studies performed by the U.S. Geological Survey (Hall et al., 1979), and conducted during the LTSP (PG&E, 1988, Chapter 2) and this ISFSI study reclassified most of the bedrock in the plant site area as part of the Obispo Formation.
Bedrock is locally covered by unconsolidated Quaternary deposits including Diablo Canyon ISFSI A-7 of 42 Data Report A, Rev. 1 Pleistocene marine terrace and colluvial fan deposits, and Holocene alluvium and colluvium (Figure A-2). Late Pleistocene to Holocene landslide deposits also are present in the power plant area, but are absent in the ISFSI study area (Figures A-2 and A-3). Hall et al. (1979) divided the Obispo Formation into two members: a fine-grained, massively bedded, resistant, zeolitized and silicified tuff (mapped as Tor), and a thick sequence of interbedded marine sandstone, siltstone, and dolomite (mapped as Tof). During the current geologic investigations, the marine sedimentary deposits of member Tof in the plant site area were further divided into three units, a, b, and c, based on distinct differences in lithology.
Unit Tofa is a thick to massively bedded diatomaceous siltstone and tuffaceous sandstone; unit Tofb is a medium to thickly bedded dolomite and dolomitic siltstone, dolomitic sandstone and sandstone, including lesser siltstone beds; and unit Tofu is a thin- to medium-bedded extensively sheared shale, siltstone and claystone (Figure A-1). The DCPP and the Diablo Canyon ISFSI are sited on sandstone and dolomite strata of unit TOfb of the Obispo Formation (Figure A-2). The Obispo Formation in the plant site area is intruded by diabase and gabbro sills and dikes. These intrusive rocks originally were mapped as a member of the Obispo Formation (Tod) by Hall (1973), but later were reclassified as a separate volcanic formation (Tvr) by Hall et al. (1979), because the rocks intrude several different formations, and are not confined to the Obispo Formation.
The nomenclature of Hall et al. (1979) has been adopted, and these rocks are mapped as Tertiary volcanic rock (Tvr) in the plant site area. These intrusive rocks are well exposed in the north wall of Diablo Canyon, across from the ISFSI site (Hall, 1973). The diabase typically is a dark, highly weathered, low-hardness rock. It is altered and weak, has a fine crystalline structure, and weathers spheroidally (Photo A-4). Petrographic analysis of hand samples (Diablo Canyon ISFSI Data Report J) shows that the diabase is generally an altered cataclastic gabbro or diorite. Parts of the intrusion are exposed in the roadcut along Tribar Road east of the raw water reservoir near the northeastern corner of the ISFSI study area (Figure A-2). Diablo Canyon ISFSI A-8 of 42 Data Report A, Rev. 1 Quaternary deposits locally cover bedrock within the plant site area (Figures A-1, A-2, and A-3). These unconsolidated sediments were deposited in distinctive geomorphic landforms that include coastal marine terraces (map unit Qptm), debris-flow and colluvial fans at the base of hills and within swales (map units Qdf, Qhf, Qpf, Qc), landslides on hillslopes and sea cliffs (map unit Qls), and alluvial fans and stream terraces deposited by Diablo Creek and ephemeral hillslope drainages (map unit Qal). The marine terrace platforms along the coast typically are covered by a thin basal layer of marine sand and sandy gravel, both of which are deeply buried by colluvial, debris-flow, and alluvial deposits consisting of sandy clay, gravelly clay, and clayey sand. These deposits commonly form sequences several tens of feet thick at the base of hillslopes.
The deposits are laterally highly variable with rapid facies changes and lenticular bedding.
The marine terrace deposits and older fan sediments are late Pleistocene, and exhibit deep weathering, mature soil development, and local carbonate horizons.
The ages and distribution of marine terrace deposits along the coast are described in detail by PG&E (1988, 1992); Lettis et al. (1992) and Hanson et al. (1994). Slopes in the plant site area are subjected to mass-wasting processes, including landslides, debris flows, creep, gully and stream erosion, and sheetwash.
Figures A-I and A-2 show locations of mapped debris flows and landslides.
Notable slope failures include: (1) shallow debris flows in colluvial swales on the western flank of the ridge south of the ISFSI study area and in the walls of Diablo Canyon; (2) large, deep-seated landslides involving surficial deposits and bedrock in the south canyon wall of Diablo Canyon, east of the ISFSI study area; and, (3) seacliff slumps and small rockslides in bedrock and terrace deposits, as in Patton Cove (Photo A-5). 3.1.1.1 Geomorphology and Quaternary Geology The geomorphology and Quaternary geology of the Diablo Canyon plant site area is dominated by a flight of coastal marine terraces, deep fluvial incision along Diablo Canyon Creek, and deposition of alluvial and colluvial fans at the base of hillslopes.
Quaternary deposits cover bedrock across most of the power plant property, except in the Diablo Canyon ISFSI A-9 of 42 Data Report A, Rev. 1 ISFSI study area where extensive borrow excavation in the 1970s removed the Quaternary deposits.
These deposits accumulated in distinctive geomorphic landforms that include coastal marine terrace platforms, debris and colluvial fans at the base of hills and swales, landslides on hill slopes and sea cliffs, and alluvium along the floor of Diablo Canyon. The distribution of Quaternary deposits and landforms are shown on Figures A 1 and A-2. 3.1.1.2 Marine Terraces A flight of several marine terraces form broad coastal platforms within the western part of the power plant property (Figure A-2). The power plant, turbine building, and associated support facilities and buildings are constructed on these terraces.
Discontinuous remnants of older and higher terraces are also locally present across the ISFSI study area. These marine terraces consist of a relatively flat bedrock wave-cut bedrock platform, thin layer of marine sand and cobble sediments, and surficial deposits of colluvium, alluvium, and eolian sediments.
The "staircase" of bedrock platforms result from a combination of regional uplift, sea level fluctuations, and wave erosion.
The locations and elevations of marine terraces along the coast from Avila Beach to Montana del Oro and Morro Bay, including the area of the power plant, were initially characterized during studies for the PG&E Long Term Seismic Program (PG&E, 1988). Several terraces were mapped in more detail for the ISFSI site studies. The estimated locations of the inner edge (or shoreline angle) of these terraces are shown on Figure A-2. Well developed wave-cut bedrock platforms occur in the power plant property at elevations of about 30 to 35 fee (Qi), 100 to 105 feet (Q2), and 140 to 150 feet (Q3), respectively, and form relatively level bedrock surfaces under the surficial Quaternary deposits along the coast. The platforms slope gently seaward at angles between 20 to 30, and are bound landward by steep (500 to 600 documented elsewhere in the LTSP studies) former sea cliffs that are now largely covered by terrace deposits.
A sequence of Pleistocene to Holocene colluvial fans cover the landward portion of the coastal terraces.
These deposits consist of crudely bedded clay, clayey gravel, and sandy clay with distinct Diablo Canyon ISFSI A-10 of 42 Data Report A, Rev. I paleosol and carbonate horizons.
The lower, Pleistocene fan deposits are very stiff and partly consolidated with highly weathered clasts, carbonate horizons, and an oxidized appearance.
The upper, Holocene deposits are unconsolidated with a higher organic content and do not contain argillic and carbonate horizons.
Near the ISFSI site, discontinuous remnants of a higher marine terrace are present. The terrace has an approximate shoreline angle elevation of 290 feet (Qs) (Figure A-2). The terrace deposits consist of a basal layer of marine sand and gravel overlain by colluvial sandy clay and clayey gravel. This terrace may be coeval with an estuarine deposit of black clay with interfingering white shell hash that outcrops beneath the edge of the 500kV switchyard fill. The clay appears to have been deposited in an estuarine environment by an ancient marine embayment into Diablo Canyon. Most of the "290 foot" marine terrace, however, has been eroded away by incision along Diablo Canyon Creek, or is buried by younger stream terrace and landslide deposits.
Interpretation of pre-construction air photos indicate that much of this embayment is removed ro buried by the switchyard and road fills. The thickness of the terrace deposits (depth to bedrock) varies greatly, from less than 10 to greater than 70 feet thick. Extensive grading for the Diablo Canyon power plant and related facilities and parking areas has substantially modified the landslide morphology and thickness of terrace deposits in some locations.
The current thickness of terrace deposits, therefore, is locally dependent on site-specific grading activities.
3.1.1.3 Inland Quaternary Deposits Diablo Canyon Creek has carved a deep channel into bedrock, causing oversteepening of the slopes along the canyon walls. Some narrow, thin channel deposits, and one locally preserved stream terrace veneered by colluvial deposits, are present in the canyon. The rate and extent of erosion, however, generally has been dominant over sedimentation in the canyon, and alluvial deposits are thin and of limited extent. Substantial reaches along the lower part of the creek were artificially filled, channeled, and altered during Diablo Canyon ISFSI A-il of 42 Data Report A, Rev. I development of the power plant and related facilities, particularly around the 230kV and 500kV switchyards which are constructed on large fill pads spanning the bottom of the canyon. Slopes in the local hills are extensively modified by mass wasting processes including landslides, debris flows, creep, gully and stream erosion, and sheet wash. Extensive grading to form level platforms for the power plant and related facilities along the back edge of the coastal terraces, has greatly modified the lower portions of most slopes in the plant site area. Large deep-seated landslide complexes are present on the slopes of Diablo Canyon south of the 230kV and 500kV switchyards (Figure A-2). These features consist of large (exceeding 100 acres), deep-seated, coalescing landslides.
The dip of bedrock in the vicinity of these large slides is downslope, contributing to slope instability.
This condition suggests that the failure planes for these slides probably occurred either at the contact between bedrock and overlying weathered bedrock and colluvium, within the bedrock along bedding contacts, or along contacts between Obispo Formation bedrock and relatively weaker diabase.
The large landslide complexes have been considerably modified by erosion, and thin stream terraces, and possible remnants of the 290-foot marine terrace, appear to have been cut into the toes of some of the slides. These conditions suggest that they are old features that likely formed prior to the Pleistocene-Holocene transition, under a wetter climate. The older large slide complexes therefore appear to have reached a stable configuration under the present climatic conditions that have persisted during the Holocene (past 10,000 years or so). Debris flow scars and deposits occur on, and at the base of, slopes, commonly where colluvium collects in topographic swales or gullies on the upper and middle slopes. Debris flows are usually triggered by periods of intense rainfall that allow development of perched groundwater within hillside colluvial deposits.
Following initial failure, the saturated mass flows rapidly down drainage channels, commonly scouring the bottom of the channel and increasing in volume as it travels downslope.
The flow stops and leaves Diablo Canyon ISFSI A-12 of 42 Data Report A, Rev. I a deposit of poorly sorted debris at a point where the slope angle decreases.
Debris fans formed by accumulation of successive debris flows are present at the mouths of the larger canyons and gullies in the area, including Diablo Canyon and the smaller canyon directly to the north (Figure A-2). Several recent shallow debris flow scars are located within the upper parts of colluvial swales. 3.1.2 Stratigraphy of the ISFSI Study Area The ISFSI study area occupies a former borrow excavation used to derive fill for the 500 and 230 kV switchyards.
The excavation removed surficial soil and Quaternary deposits in the ISFSI and CTF pad areas, and bedrock of the unit Tofb of the Obispo Formation is exposed or covered by a thin mantle of rocky construction rubble or fill (Photo A-6). Detailed mapping and subsurface exploration in the borrow cut area resulted in the subdivision of unit Tofb of the Obispo Formation into an upper dolomite (subunit Tofb-I) and lower sandstone (subunit Tofb-2) (Figure A-3). The lower sandstone subunit consists of fine- to coarse-grained, cemented sandstone and dolomitic sandstone (Photos A-7 and A-8), and lesser dolomite beds. The upper dolomite subunit is a generally fine-grained to microcrystalline, well-cemented dolomite (Photos A-9, A-10 and A- 11) and dolomitic sandstone and siltstone, with some clay in the matrix. The dolomite is moderately hard to hard and typically medium strong to brittle. The sandstone is arkosic to arenitic.
Both of these subunits contain mappable zones of friable dolomite and sandstone (Tofb-la and TOfb-2a, respectively, Photos A-12 and A-13). Within these mappable zones, the friable sandstone is of low hardness and is very weak to weak; similarly, the friable dolomite is altered or weathered dolomite or dolomitic siltstone that has a block in matrix friable consistency or simply a silt and clay matrix with friable consistency.
The friable dolomite is of low hardness and is very weak to weak. Several thin clay beds also were exposed in the trenches (Diablo Canyon ISFSI Data Report D) and encountered in borings (Diablo Canyon ISFSI Data Report B) within both the dolomite and sandstone Diablo Canyon ISFSI A-13 of 42 Data Report A, Rev. 1 bedrock (Photos A-14, A-15 and A-16). The clay beds are irregular in thickness and lateral continuity, and contain foraminifera fossils (Diablo Canyon ISFSI Data Report J). 3.2 Structure Bedding in the plant site area generally dips to the east as part of the regional Pismo syncline, whose axis lies east of the plant site area. Smaller parasitic structures occur within the plant site area, including a small anticline/syncline duplex on the ridge crest south of the ISFSI study area (Photo A-17). These folds trend north-northwest in the ISFSI study area and have influenced the geometry of bedding in the area. Above the ISFSI pad and cut slope locations, bedding generally dips shallowly to the northwest out of the hill (Figure A-3). In the pad and cut slope areas, bedding dips shallowly to the west in the western portion of the ISFSI site, and to the east in the eastern portion of the site (Figure A-3). Several north-northwest-trending minor faults are mapped in the Plant site area and ISFSI study area (Photos A-18, A-19, A-20 and A-21). These faults generally strike northwest (N50' to 75'W) (Figures A-2 and A-3). The location, geometry, and lateral extent of faults were characterized by geologic mapping of surface exposures, interpretation of stereo-paired aerial photography (Photo A-22), visual examination in exploratory trenching, and review of borehole core and video logs. Subhorizontal slickensides on the surfaces of the minor faults indicate primarily strike-slip displacement.
Slickenside rakes on the faults vary from 0' to about 200 and plunge both northwest and southeast.
In the ISFSI study area, these faults locally juxtapose the dolomite and sandstone (units Tofb-I and Tofb-2). Similar minor faults exhibiting northwest strikes, steep dips, and subhorizontal slickensides are exposed along Diablo Creek Road in the northern wall of Diablo Canyon (Figures A-1 and A-2 and Photo A-23). These faults occur along trend of the faults exposed at the ISFSI site. Data on discontinuities (joints, faults, bedding) are summarized in Diablo Canyon ISFSI Data Reports F and H. Diablo Canyon ISFSI A-14 of 42 Data Report A, Rev. 1
4.0 REFERENCES
Compton, R.R., 1985, Geology in the Field: New York John Wiley and Sons, 398 pp. Hall, C. A., Jr., Ernst, W. G., Prior, S. W., and Siese, J. W., 1979, Geologic map of the San Luis Obispo-San Simeon region: U.S. Geological Survey Miscellaneous Investigation 1-1097. Hanson, K.L., Wesling, J.R., Lettis, W.R., Kelson, K.I., and Mezger, L., 1994, Correlation, ages, and uplift rates of Quaternary marine terraces:
South-central coastal California, in Alterman, I.B., McMullen, R.B., Cluff, L.S., and Slemmons, D.B., eds., Seismotectonics of the Central California Coast Ranges: Boulder, Colorado, Geological Society of America Special Paper 292, pp. 45-71. Harding Miller Lawson Associates, 1968, Report, soil investigation, intake and discharge lines, borrow area, and switchyards for Unit 1, Diablo Canyon site, San Luis Obispo County, California, consultant's report. Harding Lawson Associates, 1970, Landslide investigation, Diablo Canyon site, San Luis Obispo County, California, consultant's report. Hartz, C.E., no date, ISFSI Site Investigation DCPP, EDMS Item #993500012, 10 CFR 50 Appendix B, Criterion III, 12 p. Lettis, W.R., and Hanson, L., 1992, Quaternary tectonic influences on coastal morphology, south central California:
Quaternary International, Vol. 15/16, pp. 135-148.
PG&E, 1988, Final Report of the Diablo Canyon Long Term Seismic Program.
PG&E, 1991, Addendum to the 1988 Final Report of the Diablo Canyon Long Term Seismic Program.
PG&E, 2000, Units 1 and 2 Diablo Canyon Power Plant, Final Safety Analysis Report Update, Revision 13. PG&E Geosciences Department, 2001a, Memo from William D. Page to Jeff Bachhuber of October 11, 2001, Transmittal of ISFSI site and vicinity 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. PG&E Geosciences Department, 2001 b, Memo from William D. Page to Jeff Bachhuber of October 12, 2001, Transmittal of requested drawings for the DCPP Used Fuel Storage project for Calculation Package GEO.DCPP.0 1.21, Analysis of bedrock stratigraphy and geologic structure at the DCPP ISFSI Site. PG&E Geosciences Department, 2001 c, Memo from William D. Page to Rob Witter of October 26, 2001, Transmittal of additional maps and plans for the DCPP Used Fuel Storage Diablo Canyon ISFSI A- 15 of 42 Data Report A, Rev. 1 project for Calculation Package GEO.DCPP.01.21, Analysis of bedrock stratigraphy and geologic structure at the DCPP ISFSI Site. William Lettis & Associates, Inc., Work Plan, 2000, 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, 2001, 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 B, Rev. 1, Borings in ISFSI Study Area. William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report C, Rev. 1, 1998 Geophysical Investigations at the ISFSI Site Area, (by Agbabian Associates and GeoVision).
William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report D, Rev. 1, Trenches in the ISFSI Site Area. William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report E, Rev. 1, Borehole Geophysical Data (by NORCAL Geophysical Consultants, Inc.). 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 G, Rev. 1, Soil Laboratory Test Data -Cooper Testing Laboratory.
William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report H, Rev. 1, Rock Strength Data and GSI Sheets. William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report J, Rev. 1, Petrographic Analysis (Spectrum Petrographics, Inc.). William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report K, Rev. 1, Petrographic and X-Ray Diffraction Analyses of Clay Beds (by Schwein/Christensen Laboratories, Inc.). Diablo Canyon ISFSI A-16 of 42 Data Report A, Rev. I Southeastward aerial photo of the ISFSI study area. The ISFSI site is in the center of photo at the base of the slope above the Raw Water Reservoir.
The photo shows the exploratory test trenches excavated within, and above, the ISFSI pads site. Hummocky ground and bowl-shaped depressions in the south wall of Diablo Canyon, east of the ISFSI study area, are large, old landslides.
In contrast, laterally-continuous beds of sandstone and dolomite visible on the west slope of the ridge to the south of the ISFSI study area are undisturbed and demonstrate the absence of large scale landslides in this area. Photo Roll JLB AR- 1.Diablo Canyon ISFSI Data Report A, Rev. 1 A-17 of 42 DIABLO CANYON ISFSI PHOTO A-1 AERIAL VIEW OFTHE ISFSI STUDY AREA Southward view of the Diablo Canyon ISFSI study area and Transport route. The ISFSI Site is located at the base of the slope behind the raw water reservoirs.
The CTF Site is in the flat area to the right of the reservoirs.
The Transport route starts behind the power plant, crosses the marine terrace towards the coast and curves back along the base of the ridge to the ISFSI Site. The extent of the 1971 borrow area excavation is indicated by brown grass and bedrock outcrops of the Obispo Formation above the reservoirs.
The natural steep slope of the canyon wall in the foreground is partly covered by the fill from the 230 kV switchyard below the reservoirs; the 500 kV switchyard is on the left. Photo roll JLB-1.Diablo Canyon ISFSI Data Report A, Rev. 1 A-18 of 42 DIABLO CANYON ISFSI PHOTO A-2 SOUTHWARD VIEW OF THE ISFSI AND CTF SITES AND TRANSPORT ROUTE 4H Geologist using Brunton compass to obtain a strike and dip measurement from a dolomite (Tofb.1) outcrop on the hillslope above, and south of, the ISFSI study area. Photo Roll JLB-2.A-19 of 42 DIABLO CANYON ISFSI PHOTO A-3 MEASURING BEDDING ATTITUDE, ISFSI STUDY AREA Diablo Canyon ISFSI Data Report A, Rev. 1ý V, Weathered diabase (Tvr) with resistant corestone exposed in the cutslope of Diablo Creek Road northeast of, and across the canyon from, the ISFSI study area. Photo Roll JLB OLD-2.Diablo Canyon ISFSI Data Report A, Rev. 1 A-20 of 42 DIABLO CANYON ISFSI PHOTO A-4 WEATHERED DIABASE ON DIABLO CREEK ROAD Northeast view of the horseshoe curve along the Transport route and the Patton Cove landslide.
Reservoir Road intersects Shore Cliff Road at center of photo. At the intersection the roads are founded on artificial fill overlying marine terrace and debris-flow fan deposits and colluvium.
The Patton Cove landslide crosses the width of the cove in the center, and its headscarp encroaches on the existing roadway. The Transport route is located to avoid the landslide.
Photo roll JLB-AR-3.Diablo Canyon ISFSI Data Report A, Rev. 1 A-21 of 42 DIABLO CANYON ISFSI PHOTO A-5 TRANSPORT ROUTE NEAR PATTON COVE LANDSLIDE
.! 1- T 715 T73' -T6 T-22'T-181 ,- "- T:I ... .T.... ""' " i 17 Southward view of ISFSI study area in center of photo above raw water reservoirs.
The 1971 borrow area cutslope is indicated by areas of bedrock exposure and brown grass. Trenches excavated for the ISFSI Site investigation are shown (trenches backfilled in April 2001. Trench T-16 is located to the left of the photo. Photo roll AR 3-25.Diablo Canyon ISFSI Data Report A, Rev. 1 A-22 of 42 DIABLO CANYON ISFSI PHOTO A-6 SOUTHWARD VIEW OF ISFSI STUDY AREA d--i-- f Outcrop of thick to massive bedded, weathered sandstone (Tofb_2), near Reservoir Road west of the ISFSI study area. Photo Roll JLB OLD-2.Diablo Canyon ISFSI Data Report A, Rev. 1 A-23 of 42 DIABLO CANYON ISFSI PHOTO A-7 WEATHERED SANDSTONE, UNITTofb-2, ON RESERVOIR ROAD Cemented sandstone (Tofb-2) in trench T-17. Photo roll JLB-5.A-24 of 42 DIABLO CANYON ISFSI PHOTO A-8 SANDSTONE OF THE OBISPO FORMATION IN TRENCH T-17 Diablo Canyon ISFSI Data Report A, Rev. 1
-" 4- " %, .Thin-to medium-bedded dolomite (Tofb-l) exposed in the roadcut of Reservoir Road directly southwest of the ISFSI study area. Note the laminations and bedding parting surfaces in the dolomite.
Gray zones in the rock are believed to be petroliferous stains and alteration areas. Photo roll JLB-4.Diablo Canyon ISFSI Data Report A, Rev. 1 A-25 of 42 DIABLO CANYON ISFSI PHOTO A-9 WELL-BEDDED DOLOMITE, UNIT Tofb-1, ON RESERVOIR ROAD Dolomite (Tofb-l) exposed along Reservoir Road above parking lot 8. Exposure illustrates well-bedded strata. Some joints terminate at bedding planes (e.g. in left middle). Gray is unweathered and brown is weathered rock. Photo roll JLB-4.Diablo Canyon ISFSI Data Report A, Rev. 1 A-26 of 42 DIABLO CANYON ISFSI PHOTO A-10 CLOSE-UP VIEW-OF WELL-BEDDED DOLOMITE ON RESERVOIR ROAD Typical bedding in massive dolomite (Tofb-1) having few joints, trench T-5. Photo roll JLB-2.Diablo Canyon ISFSI Data Report A, Rev. 1 A-27 of 42 DIABLO CANYON ISFSI PHOTO A-11 MASSIVE DOLOMITE IN TRENCH T-5 Friable sandstone (TOfb-2a) in trench T- 1. The friable sandstone generally is weakly bedded and jointed. A small near-vertical fault is indicated by oxidized clay stringers in the sandstone.
Photo roll JLB-3.Diablo Canyon ISFSI Data Report A, Rev. 1 A-28 of 42 DIABLO CANYON ISFSI PHOTO A-12 FRIABLE SANDSTONE IN TRENCH T-1 A rr -It. & lytt -Friable dolomite (Tofb-la); (left part of photo) in contact with closely-fractured dolomite (Tofb-u) in trench T-20A. Shear fabric in dolomite at the contact indicates the presence of a minor fault. The friable dolomite has block-in-matrix composition, with harder blocks of limestone and dolomite in a silty matrix; no bedding or joints are evident.
Photo roll JHG-2.uiablo uanyon ISi-Fi uata Heport A, Rev. 1 A-29 of 42 DIABLO CANYON ISFSI PHOTO A-13 FRIABLE DOLOMITE, UNIT Tofb-la, IN TRENCH T-20A r Typical dolomite (Tofb-l) and clay beds exposed in trench T-11C. Clay beds are subhorizontal and define bedding. Photo roll 01JLB-1.Diablo Canyon ISFSI Data Report A, Rev. 1 A-30 of 42 DIABLO CANYON ISFSI PHOTO A-14 DOLOMITE OFTofb-1 AND CLAY BEDS IN TRENCH T-11C Thin clay bed and fracture in dolomite (Tofb-.), trench T-14A. Clay bed crosses directly above the pick and is relatively thin, about 1/4 to 1/2 inch thick, compared to the 4 inches in Trench T-14B. Some clay has been translocated into the fracture above the pick. Photo roll JLB-9.uiablo uanyon uaia Report A, HeY. 1 A-31 of 42 DIABLO CANYON ISFSI PHOTO A-15 THIN CLAY BED AND FRACTURE IN TRENCH T-14A Clay bed in dolomite (Tofb-l), trench T-14B. Clay bed is up to 4 inches thick. The brass tubes contain samples being taken for laboratory testing. Photo roll JLB-8.Diablo Canyon ISFSI Data Report A, Rev. 1 A-32 of 42 DIABLO CANYON ISFSI PHOTO A-16 CLAY BED IN TRENCH T-14B
-Reservo)ir,1F~oad Photo of Obispo Formation dolomite and sandstone strata exposed on the hillslope above the Transport route on Reservoir Road. The ISFSI site is to the right of the raw water reservoirs.
Bedding dips into the hillslope on the west limb of the regional Pismo syncline and extends beneath the power block (off photo on left). A small parasitic syncline is evident as the U-shaped strata directly below the ridge crest in the middle part of the photo. Several debris flow chutes (4) form the gullies on the slope above Reservoir Road. Photo roll JLB-2. DIABLO CANYON ISFSI PHOTO A-17 OBISPO FORMATION DOLOMITE AND SANDSTONE ON HILLSLOPE ABOVE RESERVOIR ROAD Diablo Canyon ISFSI Data Report A, Rev. 1 A-33 of 42 Bedrock fault in trench T-1 juxtaposing friable sandstone (TOfb_2a) against dolomite (Tofb-l).
Photo roll JLB-2.Diablo Canyon lSFSI Data Report A, Rev. 1 A-34 of 42 DIABLO CANYON ISFSI PHOTO A-18 FAULT IN TRENCH T-1 Typical small bedrock faults in trench T- 1. The faults juxtapose friable sandstone (TOfb-2a) on left against fractured dolomite (Tofb-l) on right. A remnant of unaltered, cemented sandstone (Tofb_2) remains in upper left. Photo roll JLB-4.A-35 of 42+ A S"' " ' ' ".; -I, DIABLO CANYON ISFSI PHOTO A-19 TYPICAL SMALL BEDROCK FAULTS IN TRENCH T-1 Diablo Canyon ISFSI Data Report A, Rev. 1 K; W 7, 4- .. , , ' ~ :"~.A .. ý -A Friable dolomite (Tofb.-a) in foreground in fault contact with bedded dolomite (Tofbl) in background, trench T-6. Photo roll JLB-10.ulaDilo uanyon I:-FSI Data Report A, Rev. 1 A-36 of 42 DIABLO CANYON ISFSI PHOTO A-20 FRIABLE DOLOMITE IN FAULT CONTACT WITH DOLOMITE IN TRENCH T-6 Fault zone in trench T-21. Dark gray friable sandstone in center separates altered dolomite (TOfb-]a) on the left from dolomite (TofbI) on right. Photo roll JGH-2.r- a p ,ARv. A-37 of 42 DIABLO CANYON ISFSI PHOTO A-21 FAULT ZONE IN TRENCH T-21 13 1968 air photo (2777, 2808-2) of ISFSI study area prior to excavation of the borrow site. Geomorphic features indicative of large bedrock landslides or active faulting are not present at the site. Diablo Creek traverses the upper (northern) part of the photo and trenches for the power block are evident in the west edge of the photo. The road that follows the ridge crest in center of photo was removed during 1971 excavation of the borrow area. The location of the raw water reservoirs is where the road divides into four near the photo center. Geologic and geomorphic features annotated on the photo are from interpretation in June 2000.Diablo Canyon ISFSI Data Report A, Rev. 1 A-38 of 42 DIABLO CANYON ISFSI PHOTO A-22 1968 AERIAL PHOTOGRAPH OF ISFSI STUDY AREA 1968 air photo (2777, 2808-2) of ISFSI study area prior to excavation of the borrow site. Geomorphic features indicative of large bedrock landslides or active faulting are not present at the site. Diablo Creek traverses the upper (northern) part of the photo and trenches for the power block are evident in the west edge of the photo. The road that follows the ridge crest in center of photo was removed during 1971 excavation of the borrow area. The location of the raw water reservoirs is where the road divides into four near the photo center. Geologic and geomorphic features annotated on the photo are from interpretation in June 2000. DIABLO CANYON ISFSI PHOTO A-22 1968 AERIAL PHOTOGRAPH OF ISFSI STUDY AREA Diablo Canyon ISFSI Data Report A, Rev. 1 A-38 of 42".=200' .2t 1x ..;8122-68 ete vtB.3 81/2510 bedrok-6r~hin soil D-- tS.t" -as". -... .. ..T. ..-.-... Resd-to':
sa\ '"- -: -':" :".-Tof ..' "-.::: " "- t __. _.. -: -~QPtm . * , >r Diabase ~~ , Diabase / ro Thin -%. / <A -r--~--Ancient
-- ricib .. CToarge' S. ...j.. Clsed r..Vslide QjS0 basin -complex Res~~w~ " .. .::..-.. .r"% Nhn Tof5 // jshZf Power Block ' hstd: bed-' ;' -----' / trenches area -: area.,-i AW .Northward view of Diablo Creek Road cut showing steeply-dipping faults in dolomite of unit Tofbl. Slickensides and mullions on the fault plane indicate primarily strike slip displacement, but offset bedding also suggests a component of down-to-the-east vertical separation of approximately 1 to 2 meters. These faults are located along projection of faults exposed in trenches in the ISFSI study area approximately 800 feet to the southeast, and also exhibit similar strike and slickenside/mullion rakes. Photo Roll JLB5/16-1.
DIABLO CANYON ISFSI PHOTO A-23 FAULTS IN DIABLO CREEK ROAD CUT Diablo Canyon ISFSI Data Report A, Rev. 1 A-39 of 42 Explanation
[f Areifcl fill (engineered), only major fills shown [1 Quatemary landslide deposits 5] Volcanic rock (middle Miocene), diaose intrusive sills and dikes Oblspo Formation (lower and middle Miocene) -bedded dolomitic sandstone, silastone, and claystone with tuffaceous beds, locally Calcareous.
some chert and volcanic rock lenses Member Tof -Sandstone and dolomite rTdE Unit a -dalnonaceous siltstone and tuffaceous sandstone; yellow brown to tan; tnick to massive bedding -Fbr9 Unit b -dolmoimi ddjonitc sitstone, dolomintc sandstone and sandstone, medium to very Thick bedding unit c -shale, claystone and siltstone, thin to medium bedding extensively sheared Tor Member To, -Volcanic rock, zeolized and silicified tuft -? Bedrock fault or shear zo. e, dashed wbtere apppr rrate, queried where uncertain, arrows show sense of displacement
-.- -.? Geologic Contact, solid line where well-defined, dashed where approximate, queried and/or dotted where uncertain Cut or fill slope Of Lare landslides.
Arrows indicate direcdion of movement, hoc.ures define head scap. (Smaller landslides are not shown) IV 500-kV tower 10 Generalized strike and dip of bedding Parasitic folds on south limb of Pismo syncline Axis of anticine, plunge indicated by arger 4-4--- -arrow, dahdweeapproxlimately so dashned! "amr Itp~dutylcted AMes of svnocne, olunge ndicated by larger arrow, dashed where awroxatsw Ioted AxIs of morwllne, plunge Indicated by larger arrow, dashed where approxirnaiesy located S' QOuttine of 1971 borrow exeavaton (ISFSI study area) SSteep sea cliff 65 Strike and dip of fault Spring Note: oept for small taubs at and near The ISFSI s ry rat, geologic stMrucures and bedrmd urt s, and arge landsfldes, are shown, DIABLO CANYON ISFSI FIGURE A-1 GEOLOGIC MAP OF BEDROCK AND LANDSLIDES IN THE PLANT SITE AREA Diaroa Canyon lSF81 Data Report A, Rev. 1 A-40 of 42 Cot Base Maps: PS&E Civil Site Facilie Layout Plan (Modifled 1994) Topography from PG&E, IMO (and later revisions), Plot plan dMaring 471124 Geology mcdifled from: CA Hall, Jr.. WG. Ernest, S W Prior, and J.W. Slese, 1979, Geologic map oftme San Luis OtIspc-San Smon regi"o, U.S. Geaopgcal Surve, Miscdleous IrvestigatIon 1-1097. C.A. Hall Jr., 1973, Geolgoic Map of the Mono Bay South and Port San LUWe Quadrarqes, Son Luis ObSpo County California, US, Geological Survey MisCellaneous Held Studies Map MFRS11, scale 1:24.001 DIABLO CANYON ISFSI FIGURE A-2 GEOLOGIC MAP OF THE ISFSI SITE AND TRANSPORT ROUTE VICINITY Explanation G.k =ofrname ffprn,; U."of 02 nuý aWqfsodohdk,,1pdc1
- a. m1polos r_ <7 Footorint 0 &XdW foyfo, cefi. hooods.op nogion Andi fiH p.,irompood) op`d-pdY=
,-= capris ftos, .1.1poo colismal fion =1,:ýr f.. 1%7 dovver oloof lffý WON 0ý-D of pooser ooong foý PrW... Hý fowdl HML sluclop.
B.,49 W SFS1 ý.i ýA 1 M fis 2001 ." lo, ISF51 ý& ýssi ý 1 1,im T..r r." 'or d Mos. non.ioof ompts 11 d.rl ý. .rghesnodffli Solos ond dip 0 kult"fis"od. If. h. doposit wpoý)10 StrisdoarddsofboddN
ýrturoea tsfddhg H.ft.%1 tooddlo, Vposs. ook (.0do, middos), dislosse sdo..1p, apid dikes; IvIsodtfoW.
Wit b -doodonits.
cosorrifto mi dddsýw sonoodD's..
d pooflum to msc, becMed. h4oroper Td, Un It c -81,do, cloyodons and sibi ffisso I Toodiurn bodi,. spdesooý!, s,,o.,od.
M.WTý sopposcook.sompodsopffolkilksoopff t=1,so, ]olr p's"ps, dodshecl sqo,ý.% Asis of entolins, low, of." d==.Ni no poofs :pogmp7 , No =is u com,61W of Wr disood ýý o ofosso ft 1,2. Pot S%I Ixoder cool. fool 0,oa,,k odo o,,,,,do sm. ý.pfftosssfidsofsdoos.ýý,ýýc avolo '=..ft sopor of ýossifsofispsl do. 0dof N &= to)Ddblo Cý JSF81 Do% RMW A. Rev I A-41 of 42 002 as Fowl r6wm]
SColluvium CTF Sit 2 #0 A b-2& Paved am EXPLANATION E 1 ,1,18,500 I E 1,149,(K0----------U-m-iof--c
ýPogmhjo u + " +S ? -X ---\ Aso
- T-11 / *1 c/l >- ~~T ,' T 4 A , b d o% ~ T 4 4 t
- 9 f ~~~ 1-36 ~ 9 " rI-.l , ,;4 / ,. T-1 vb ' s~'1d4 r._N 636.0D01 S T-16c: .N 635,50D 2--4 clay bad x'\-4 T-11 /SMarine terrace deposit (overlain tby Oc) Obispo Formotion flowe and middle Miocene,)
DOLOMITE UNIT SDolomite, claey dolomite, dolomitic stitetone to fine-gralned dolomitic sandstone, and limestone.
The unit contains occasional discontinuous to continuous (tens to hundreds of feet) clay beds that are generally 1/32 to 1/2-inch thick, but locally arm thicker. Rocks in this unit are moderatety to well cemented, moderately hard to hard, moderatelyt)lgtywhrd brittle and typically medium strong. F~i7a Fdedle dolomnite and dolomitic siltstone of unit Tofb-l. These rocks typically have low hardness, are very weak to weak, and occur as discontinuous zones where weathering and/or afteratiorn has been concentrated.
Inferred lateral extent of friable zones is schematic.
SANDSTONE UNIT SFine to coarse-grained dolomitic sandstone and sandstone (arkoaic to IN arniftc) with lesser dolonifte beds. Detrital clasts are composed primarily of dolomitized feldspars, marine foissil fragments, and volcanic rock fragments.
Discontnuous sday beds that wre generally Iless than 1/2-inch thick occur locally within the unit. The rocks are of low to medium hardness, moderately to well cemented and typically medium strong. Friablesandstone of unit Toft-2. These rockst pcaily ameof low hardness are very weak to weak, and occur as disciontinuous zones where weathering and/or alteratiorn has been concentrated.
Inferred lateral extent of friable zones is schematic.
DIABLO CANYON ISFSI FIGURE A-3 GEOLOGIC MAP OF ISFSl AND CTF SITES 6Strike and dip of bedding T74_-_ý Exploratory trench, number indicated DS-I/ DIsconthnuity survey line in bulldozer cut U 80 D -ýMinor fault, dip indicated, dashed where inferred, queried where uncertain, arrows show relative, sense of displacement, U-upthrown, D-downthrown Footprint of 500-kV lower SSmall, secondary faults exposed in trench Clay bad, thickness indicated\/ " t ',of ,SFS, ds m Axis of anticline, Ila r arrow shows plu nge, d=1 dee approximate Axis of syncline, largr arrow shows plunge, daashed S"where approximate Axis of monoctine, larger arrow shows plunge, dashed Swhere approximate 1116,'J" Geologic contact, solid line where well-defined, dashed where approximate Boring for ISFSI, number indicated (initial number is ylear drilled, e.g. 01 was drilled in 2001) Surfed shoreline angle of marine terrace, wave-cut latolrri, number laid elevation iric atedý I I eg Notes: ISFSI9I rometry Is based on PG&E Enercon Drwg. Base map from No. PGE-009-sk-001 dated 9127/01.
Geology not shown in paved area and reservoir area, GO v.P 5O i Mal.lll Canyoni ISFSI Data Repor A, R. 1 A-42 of 42 13o 05 DIABLO CANYON ISFSI DATA REPORT B BORINGS IN ISFSI STUDY AREA DIABLO CANYON ISFSI PREPARED BY Jeff Bachhuber Printed Name DATE 12/14/01 William Lettis & Associates, Inc. Organization VERIFIED BY Scott C. Lindvall Printed Name APPROVED BY DATE William D. Page Printed Name William Lettis & Associates, Inc. Organization PG&E Geosciences Dept. Organization Diablo Canyon ISFSI Data Report B, Rev. 1 DATE B-1 of 244 m 1.0 2.0 3.0 4.0 DIABLO CANYON ISFSI DATA REPORT B BORINGS IN ISFSI STUDY AREA DIABLO CANYON ISFSI Table of Contents Page Introduction
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B-3 M ethodology
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B-5 Results ...............................................................................................................
B-7 References
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B-8 List of Tables Table B-1 Summary of ISFSI Study Area Borings Table B-2 Friable Rock Zones in ISFSI Study Area Borings Table B-3 Interpretation of Bedding in Boreholes, ISFSI Study Area Table B-4 Evaluation of Clay "Seams" on Low Angle Fractures and Bedding, ISFSI Study Area Borings Table B-5 Thickness Measurements of Clay Beds in Borings and Trenches List of Figures Figure B-1 Boring Location Map, ISFSI Study Area Figures B-2 -B- 16 Photographs of Drilling in the ISFSI Study Area Figures B-17 -B-55 Photographs of Core Boxes in the ISFSI Study Area Figures B-56 -B-70 Summary Logs of Borings in the ISFSI study area List of Attachments Attachment I Field Boring Logs Attachment 2 Groundwater Level Measurements Diablo Canyon ISFSI B-2 of 244 Data Report B, Rev. 1 DIABLO CANYON ISFSI DATA REPORT B BORINGS IN ISFSI STUDY AREA DIABLO CANYON ISFSI
1.0 INTRODUCTION
Seventeen borings were drilled in the Diablo Canyon ISFSI study area to investigate subsurface stratigraphic and structural conditions and to evaluate foundation properties of bedrock at the ISFSI and CTF sites. These are summarized in Table B-1. Seven borings were drilled during preliminary site investigations in 1998 and 2000, and ten borings were drilled during final site characterization in 2001. Rock encountered in the borings consisted predominantly of interstratified dolomite, dolomitic sandstone, and sandstone.
Additional description in the rock strata in the region and at the ISFSI site and geologic maps are included in William Lettis & Associates, Inc. (2001) Diablo Canyon ISFSI Data Report A. Some thin clay beds and minor amounts of limestone also were encountered.
In localized zones, the dolomite, dolomitic sandstone, and sandstone exhibited a friable consistency (Table B-2,) probably as a result of weathering or alteration.
The rock is generally fractured and jointed and is locally faulted. Detailed logs describing the lithologic and structural features were prepared for each borehole and are provided in this Data Report. Borehole televiewer logs also were obtained for two of the boreholes drilled in 2000 and for all of the boreholes drilled in 2001 (William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report E). These logs provide a visual display of the lithologic and structural features encountered in the boreholes.
Samples of core were submitted for laboratory testing of physical properties (William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report I) and for petrographic analyses of lithology, minerology and depositional environment (William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report J). Four borings were drilled in 1998, two borings each at two different locations.
Borings 98BA-1 and 98BA-4 were drilled adjacent to each other at one site and are commonly referred to as 98BA-1/4; one boring (98BA-1) was logged and used to obtain core, and the other (98BA-4) was a reamed hole used solely for installation of geophysics casing. A geologic log was not prepared for boring 98BA-4. The other two 1998 borings (98BA-2 and 98BA-3) were drilled at the ISFSI pads adjacent to each other and are Diablo Canyon ISFSI B-3 of 244 Data Report B, Rev. 1 commonly referred to as 98BA-2/3.
Both 98BA-2 and 98BA-3 were cored and logged but 98BA-2 had to be abandoned before reaching target depth when the drill casing broke off. Boring 98BA-3 is a continuation of 98BA-2 and was reamed to the elevation of the bottom of boring 98BA-2, and cored and logged below that point. Three borings were drilled in 2000, two above the ISFSI (00BA-1 and 0OBA-2) and one near the CTF (O0BA-3).
All three 2000 borings were cored and logged. Ten borings were drilled in 2001, six within the ISFSI pads footprint (01-A, 01-B, 01-C, 01-D, 01-E, and 01-G), one in the CTF footprint (01CTF-A), and three on the hillslope above the ISFSI pads (01-F, 01-H, and 01-I). All ten borings were cored and logged. The locations and elevations of all the borings were surveyed by a licensed land surveyor.
This survey data was transmitted by PG&E Geosciences Department to WLA (PG&E Geosciences, 2001). Downhole velocity surveys were performed in the 1998 borings (described in William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report C). Optical televiewer, caliper, and gamma surveys were performed in two of the 2000 borings, and optical televiewer and caliper survey were performed in all of the 2001 borings (described in William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report E). Selected samples of rock core from the 2000 and 2001 borings were submitted for laboratory analyses of rock properties and strength (described in William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Reports I and J). Locations of all borings are shown on Figure B-1. Figures B-2 through B- 16 illustrate the drilling operations and Figures B-17 through B-55 are photos of recovered rock core. Summary logs presented in Figures B-56 through B-71 depict the general stratigraphic and rock mass conditions.
Detailed field logs describing the core photographs of core, a rock classification chart are included in this report. All the borings were performed by WLA under the general supervision of William D. Page of PG&E's Geosciences Department and field supervision of Jeff Bachhuber of WLA. William Lettis of WLA provided overall project management.
Diablo Canyon ISFSI B-4 of 244 Data Report B, Rev. 1 The preparation of this Diablo Canyon ISFSI Data Report was performed in accordance with the 2000 and 2001 Work Plans (William Lettis & Associates, Inc., Work Plan, 2001; 2001). 2.0 METHODOLOGY 1998 Borings Four exploratory borings (Borings 98BA-1, 98BA-2, 98BA-3, and 98BA-4) were drilled in May 1998 in the ISFSI study area to depths of between 150 and 250 feet. These boreholes were advanced with a truck-mounted Mobile B-40 rig from the PG&E General Construction Drilling Department, using diamond-bit coring techniques with HQ-size bits [4-inch outside diameter (O.D.); 2.5-inch inside diameter (I.D.)]. Triple tube core barrels were used to obtain 2.5-inch diameter rock cores from the borings. Core samples were retained in a 5-foot long triple-tube core barrel retrieved through the drill steel by wireline.
Borings were drilled or reamed with HW-casing with a casing advancer and tricone bit (4.5-inch O.D. hole) in order to install downhole geophysics casing. Boring 98BA-1 was cored to a depth of 250 feet and logged continuously; however, the drill casing became stuck in the hole during grouting, necessitating a new hole (98BA-4) for down-hole geophysics.
Boring 98BA-4 was advanced entirely with a HW casing advancer without core sampling.
Thus, there are no core descriptions for boring 98BA-4 included in this Diablo Canyon ISFSI Data Report. Borings 98BA-2 and 98BA-3 were drilled 4 feet apart. During the drilling of 98BA-2, the drill stem sheared off, causing early termination of the hole at a depth of 165 feet (the target depth of this boring was 220 feet). Because of the early termination of boring 98BA-2, boring 98BA-3 was drilled adjacent to 98BA-2 with HW-casing and casing advancer to a depth of 165 feet, and then cored and logged with HQ equipment from 165 to 220 feet to complete a cored hole to the target depth. Boring 98BA-3 was not logged above 165 feet because it extended through the same bedrock section as boring 98BA-2. Patrick Drouin and Jeff Bachhuber of WLA conducted the 1998 boring program; Keith Kelson of WLA checked 98BA-2. The site geologists examined, logged, photographed, Diablo Canyon ISFSI B-5 of 244 Data Report B, Rev. 1 and boxed each core run on site as outlined in William Lettis & Associates, Inc., Work Plan (1998). 2000 Borings Three exploratory borings (Borings O0BA- 1, OOBA-2, and OOBA-3) were drilled in December 2000, to depths of between 150 and 250 feet. All of the 2000 exploratory borings were drilled vertically with HQ wireline diamond core equipment using a double tube core barrel by All Terrain Drilling (Roseville, CA). The drilling was performed under the field supervision of Jeff Bachhuber of WLA and logged by Charles Brankman and John Helms of WLA. All subsurface investigations during 2000 were performed in accordance with the William Lettis & Associates, Inc., Work Plan (2000). 2001 Borings Ten exploratory borings (Borings 01-A, 01-B, 01-C, 01-D, 01-E, 01-F, 01-G, 01-H, 01-I, and 01CTF-A.)
were drilled in April 2001. The 2001 borings were drilled to depths of between 67 and 321 feet. Similar to the 2000 borings, all the borings were drilled vertically with HQ wireline diamond coring equipment.
Drilling was performed by All Terrain drilling (Roseville, CA) and Cascade Drilling (Norwalk, CA). In many cases, drilling was performed during consecutive 12-hour shifts. All Terrain drilling used a double tube core barrel to retrieve samples on borings 01-E, 01-F, 01-G, 01-H, and 01-I. Cascade drilling used a triple tube core barrel to retrieve samples on borings 01 CTF-A, 01-A, 01-B, 01-C, -and 01-D. The geologists working on the drilling in 2001 were John Helms, Kristin Weaver, and Rich Koehler, under the field supervision of Jeff Bachhuber and Charles Brankman, all of William Lettis & Associates, Inc. The geologists examined, logged, photographed, and boxed each core run on site. The drilling was performed according to the William Lettis & Associates, Inc., Work Plan (2001). Two piezometers were installed in December 2000 by drilling out the bottom of borings 98BA-1 and 98BA-3. Both borings were initially cased and grouted after drilling in 1998 to facilitate geophysical velocity surveys. These casings were converted to open standpipe piezometers to allow measurement of groundwater levels by perforating (drilling out) the bottom of the casing and extending an uncased cored hole approximately 2 to 3 feet deeper into rock. The drill rod and bit were then withdrawn from the boring, leaving the extended rock socket uncased, and allowing groundwater to freely enter the boreholes.
The remaining portion of the PVC casing was left intact and Diablo Canyon ISFSI B-6 of 244 Data Report B, Rev. 1 protected at the surface. The converted piezometers allow measurement of groundwater that enters from fractured rock in the 2- to 3-foot extension.
Sand filters were unnecessary because the water flow is through rock fractures and the uncased rock socket remained stable without cave-in.
3.0 RESULTS
Original field logs from the 1998, 2000, and 2001 drilling are included in this Data Report. The original logs were annotated during several periods of core review to integrate reviewer comments and to reflect the evolution of understanding of the rock nomenclature and stratigraphic interpretations in response to additional information and analyses.
These modifications to the logs are dated, and initialed by the reviewers.
These annotations incorporate revised interpretations of rock types based on the cores from each of the three years of drilling and interpretation of the core data with surface outcrops.
Core review was performed by the following reviewers:
William Lettis, Jeff Bachhuber,.
Charles Brankman, Rich Koehler, and John Helms (WLA); William Page (PG&E Geoscience);
and Dale Marcum (Cotton-Shires Associates).
Skip Hendron, technical review board member, also reviewed the 1998 and 2000 core. Subsurface conditions varied between borehole sites, as shown on the included core photos, summary logs, and detailed logs. In situ bedrock typically was encountered at the ground surface, or below a one-to three-foot-thick layer of surface rubble and local thin soil. A surface layer of fill was encountered in the following borings: OOBA-3, O0CTF-A, 01-A, and 01-C. Fill encountered in boring 01-C was placed prior to drilling in order to form a level drilling pad. The remainder of the borings were cased into bedrock.
Rock encountered in the borings consisted of dolomite, dolomitic siltstone, dolomitic sandstone, and sandstone of the Obispo formation, subunit "b". This unit was further divided into two other units: Tofb_, dolomite, and Tofb_2 sandstone.
The distribution of these rock types is shown in the summary logs (Figures B-56 to B-70). Intervals of friable (weakly-cemented) rock were found at various places in the dolomite and sandstone, and are differentiated on the summary logs and field logs as friable zones and designated as Tofb-la and TOfb-2a, respectively (Table B-2). The rock also includes clay Diablo Canyon ISFSI B-7 of 244 Data Report B, Rev. 1 beds ranging in thickness from thin films to 8-1/2 inches thick. These beds dip between about horizontal to 30 degrees, and commonly are subparallel to bedding laminations.
Additional thin clay coatings and seams occur along fault planes or joints; these typically are steeply inclined and irregular in thickness.
Rock Quality Designation (RQD) and percent recovery varied significantly within, and between, borings with a range from 0 to 100 percent. The summary logs and field logs show the distribution of primary clay beds, RQD, and percent recovery within borings.
Groundwater was measured in the two piezometers in the ISFSI study area and showed declining levels following their installation in November 2000. Water levels on January 23, 2001, were at a depth of 199.76 ft (elevation 120 ft MSL) in boring 98BA-3 and 205.90 ft (elevation 170 ft MSL) in boring 98BA- 1. By October 4, 2001, the water levels in 98BA-3 had dropped 17 ft to 217.76 ft (elevation 103 ft MSL) (bottom of hole is at 220 ft depth) and in boring 98BA-1, water levels had dropped 30 ft to 235.60 ft (elevation 140 ft MSL) (bottom of hole is at 250 ft depth) (PG&E Geosciences Department, 2001). The water table is believed to be at about elevation 100 feet, the elevation of Diablo Creek opposite the ISFSI site. No groundwater was observed during drilling the borings in the ISFSI study area except 01-F. Artesian flow of about 4 gpm was observed from this hole the morning after a rain on April 23, 2001. The depth of the boring was 27 feet deep and had been grouted. This flow was caused by a temporary perched water table.
4.0 REFERENCES
Deere, D.U., and Miller, R.P., 1966, Engineering Classification and Index Properties of Intact Rock: Technical Report No. AFWL-TR-65-116, Air Force Weapons Laboratory, Kirkland Air Force Base, New Mexico. 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, dated October 31, 2001, Transmittal of water level readings, Diablo Canyon ISFSI, 1 pg. and attachment.
Diablo Canyon ISFSI B-8 of 244 Data Report B, Rev. 1 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.0 1.21, Analysis of bedrock stratigraphy and geologic structure at the DCPP ISFSI Site. William Lettis & Associates, Inc., Work Plan 1998, Phase 2 Exploratory Boreholes for the DCPP Dry Cask Siting Study Borrow Area Site, Rev. 3, May 12, 1998. William Lettis & Associates, Inc., Work Plan, 2000, 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 2001, Additional Exploratory Drilling and Geologic Mapping for the DCPP ISFSI Site, Rev. 1, September 29, 2001. William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report A, Rev. 1, Geologic Mapping in the Plant Site and ISFSI Study Area. William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report C, Rev. 1, 1998 Geophysical Investigations at the ISFSI Site Area, (by Agbabian Associates and GeoVision).
William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report E, Rev. 1, Borehole Geophysical Data (by NORCAL Geophysical Consultants, Inc.). William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report I, Rev. 1, Rock Engineering Laboratory Testing -GeoTest Unlimited.
William Lettis & Associates, Inc., 2001, Diablo Canyon ISFSI Data Report J, Rev. 1, Petrographic Analysis (Spectrum Petrographics, Inc.). Diablo Canyon ISFSI B-9 of 244 Data Report B, Rev. 1 (Table B-1. Summary ofISFSI Study Area Borings Boring No.Approximate Elcv. (ft)Total Depth (ft)Dates Drilled Drilled by Logged by Field Checked Date Personnel Cores Reviewed in Detail Date Personnel 98BA-1 372.0 250.0 5/13-21/98 PG&E PED 5/28/1998 JLB 5/1/2001 JLB, CMB, WRL 5/4/2001 JGH 98BA-2 322.0 165.0 5/27-31/98 PG&E PED 5/29/1998 KIK 5/1/2001 JLB, CMB, WRL 5/4/2001 JGH 98BA-3 322.0 220.0 5/31-6/3/98 PG&E PED 6/4/1998 GDS 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH OOBA-I 450.0 150,0 11/28-12/1/00 All Terrain CMB & JGH 12/1/2000 JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH OOBA-2 363.0 55.0 12/7-8/00 All Terrain JGH 12/1/2000 JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH OOBA-3 306.0 30.0 12/8/2000 All Terrain JGH 12/1/2000 JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH O1CTF-A 306.1 58.6 4/18-19/01 Cascade RDK 4/19/2001 JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH 01-A 305.7 71.8 4/19-20/01 Cascade JGH & RDK 5/1/2001 JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH 01-B 318.9 72.0 4/21/2001 Cascade JGH 5/1/2001 JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH 01-C 323.0 67.0 4/22-23/01 Cascade JGH 5/31/2001 JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH 01-D 325.2 68.5 4/17-18/01 Cascade JGH & RDK 4/17-19/01 CMB & JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH 01-E 337.6 81.0 4/19-20/01 All Terrain KDW 4/20/2001 JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH 01-F 390.6 130.5 4/21-23/01 All Terrain KDW 4/22/2001 JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH 01-G 316.8 76.0 4/17-18/01 All Terrain JLB, JGH, 4/17/2001 JLB 5/4/2001 JLB, CMB, WRL CMB, & KDW 5/4/2001 JGH 01-H 346.6 101.0 4/18-19/01 All Terrain JGH & KDW 5/1/2001 JLB 5/4/2001 JLB, CMB, WRL 5/4/2001 JGH RDK, JGH, 01-1 566.9 321.0 4/24-27/01 All Terrain CMB, &WRL 4/25-27/01 JLB & CMB 5/4/2001 JLB, CMB, WRL I_ I I I I I 1 1 5/4/2001 JGH (Note: Personel initialsK KIK = Keith Kelson, JLB = Jeff Bachhuber, WRL = William Lettis, CMB = Charlie Brankman, JGH = John Helms. KDW = Kristin Weaver, PED = Patrick Drouin Diablo Canyon ISFSI Data Report 1, Rev. I B-10 of244 (
Table B-2. Friable Rock Zones in ISFSI Study Area Borings.Depth Interval Test Sample of friable rock I.D. (feet)Elevation Interval (feet)Friable Zone Interval Thickness (ft)Elevation at ground surface 90.0-96.0 118-133.5 138.7-140.0 142.8-145.2 167.3-172.3 182.3-200.0 206.0-206.8 372.0 282.0-276.0 254.0-238.5 233.3-232.0 229.2-226.8 204.7-199.7 189.7-172.0 166.0-165.2 Total Friable Zone 250.0 Interval Footage =6.0 15.5 1.3 2.4 5.0 17.7 0.8 48.7% Friable = 19.5 Elevation at ground surface 5.0-15.0 46.5-48.5 56.6-60.0 65.0-68.0 70.0-89.0 96.0-97.0 103.5-107.2 146.0-150.0 Total Borehole 322.0 317.0-307.0 275.5-273.5 265.4-262.0 257.0-254.0 252.0-233.0 226.0-225.0 218.5-214.8 176.0-172.0 Total Friable Zone Depth = 165.0 Interval Footage = 46.1 % Friable = 27.9 98BA-3 Elevation at ground surface 322.0 171.6-175.0 150.4-147.0 3.4 205.0-212.0 117.0-110.0 7 Total Borehole Total Friable Zone Depth = 220.0 Interval Footage = 10.4 % Friable = 4.7 OOBA-1 Elevation at ground surface 450.0 29.0-34.0 421.0-416.0 5 Total Borehole Total Friable Zone Depth = 150.0 Interval Footage = 5.0 % Friable = 3.3 OOBA-2 Elevation at ground surface 363.0 0.0-32.0 363.0-331.0 32.0 38.2-40.6 324.8-322.4 2.4 42.0-47.5 321.0-315.5
5.5 Total
Borehole Total Friable Zone Depth = 55.0 Interval Footage = 39.9 % Friable = 72.5 Diablo Canyon ISFSI Data Report B, Rev. I B-I1 of 244 Boring 98BA-1 Total Borehole Depth =98BA-2 10.0 2.0 3.4 3.0 19.0 1.0 3.7 4 Table B-2 Friable rock zones in ISFSI study area borings. (continued)
Boring Depth Interval Test Sample of friable rock I.D. (feet)Elevation Interval (feet)Friable Zone Interval Thickness (ft)OOBA-3 Elevation at ground surface 306.0 4.0-5.6 302.0-300.4 1.6 11.1-12.8 294.9-293.2 1.7 21.6-24.0 284.4-282.0
2.4 Total
Borehole Total Friable Zone Depth = 30.0 Interval Footage 5.7 % Friable = 19.0 OICTF-A Elevation at ground surface 306.1 6.3-10.6 299.8-295.5 4.3 18.0-24.7 288.1-281.4 6.7 34.4-35.8 271.7-270.3 1.4 37.7-39.5 268.4-266.6 1.8 48.5-58.6 257.6-247.5 10.1 Total Borehole Total Friable Zone Depth = 58.6 Interval Footage = 24.3 % Friable = 41.5 01-A Elevation at ground surface 305.7 5.4-6.5 300.3-299.2 1.1 26.2-28.4 279.5-277.3 2.2 33.4-37.0 272.3-268.7 3.6 46.2-48.8 259.5-256.9 2.6 58.8 -59.0 364.5 -364.7 0.2 70.0-71.6 235.7-234.1
1.6 Total
Borehole Total Friable Zone Depth 71.8 Interval Footage= 11.3 % Friable= 15.7 01-B Elevation at ground surface 318.9 38.0-39.8 280.9-279.1 1.8 54.5-57.0 264.4-261.9
2.5 Total
Borehole Total Friable Zone Depth = 72.0 Interval Footage = 4.3 % Friable = 6.0 01-C Elevation at ground surface 323.0 7.0-14.0 316.0-309.0 7.0 40.4-42.0 282.6-281.0
1.6 Total
Borehole Total Friable Zone Depth = 67.0 Interval Footage = 8.6 % Friable = 12.8 Diablo Canyon ISFSI Data Report B, Rev. I B-12 of 244 Table B-2. Friable rock zones in ISFSI study area borings. (continued)
Boring Depth Interval Test Sample of friable rock I.D.Elevation Interval Friable Zone Interval (feet) (feet) Thickness (ft) 01-D Elevation at ground surface 325.2 22.0-37.6 303.2-287.6 15.6 67.0-68.5 258.2-256.7
1.5 Total
Borehole Total Friable Zone Depth 68.5 Interval Footage = 17.1 % Friable = 25.0 01-E Elevation at ground surface 337.6 4.7-14.0 331.3-323.6 9.3 39.2-43.0 298.4-294.6 3.8 68.4-80.7 269.2-256.9 12.3 Total Borehole Total Friable Zone Depth = 81.0 Interval Footage = 25.4 % Friable = 31.4 01-F Elevation at ground surface 390.6 33.0-33.9 357.6-356.7 0.9 37.0-38.0 353.4-352.6 0.8 43.8-45.0 346.8-345.6 1.2 46.6-47.4 344.0-343.2 0.8 57.6-60.0 333.0-330.6 2.4 103.0-106.0 287.6-284.6 3.0 117.0-121.8 273.6-268.8 4.8 123.0-124.2 267.6-266.4 1.2 130.0-130.5 260.6-260.1
0.5 Total
Borehole Total Friable Zone Depth = 130.5 Interval Footage = 15.6 % Friable = 12.0 01-G Elevation at ground surface 316.8 11.0-12.4 305.8-304.4 1.4 19.2-20.4 297.6-296.4 1.2 24.2-25.6 292.6-291.2 1.4 66.0-76.0 250.8-240.8 10 Total Borehole Total Friable Zone Depth 76.0 Interval Footage = 14.0 % Friable = 18.4 Diablo Canyon ISFSI Data Report B, Rev. 1 B-13 of 244 Table B-2. Friable rock zones in ISFSI study area borings. (continued)
Boring Depth Interval Test Sample Friable Zone of friable rock I.D. Elevation Interval Interval (feet) (feet) Thickness (ft) 01-H Elevation at ground surface 346.6 12.0-12.6 334.6-334.0 0.6 23.7-24.0 322.9-322.6 0.3 29.4-32.0 317.2-314.6 2.6 55.5-58.6 291.1-288.0 3.1 61.0-61.2 285.6-285.4 0.2 81.0-83.0 265.6-263.6 2.0 89.2-98.2 257.4-248.4
9.0 Total
Borehole Total Friable Zone Depth = 101.0 Interval Footage = 17.8 % Friable = 17.6 01-I Elevation at ground surface 566.9 33.6-39.8 533.3-527.1 6.2 61.0-61.4 505.9-505.5 0.4 62.7-63.0 504.2-503.9 0.3 68.5-69.1 498.4-497.8 0.6 109.0-115.8 457.9-451.1 6.8 155.6-156.6 411.3-410.3 1.0 252.4-252.8 314.5-314.1
0.4 Total
Borehole Total Friable Zone Depth = 321.0 Interval Footage = 15.7 % Friable = 4.9 Diablo Canyon ISFSI Data Report B, Rev. I B-14 of 244 ACKNOWLEDGMENTS The current geologic studies for Section 2.6 were performed by Jeff Bachhuber, Charles Brankman, and William L. Lettis of William Lettis Associates, Inc., under the direction of William D. Page, PG&E Geosciences Department.
Norman A. Abrahamson, PG&E Geosciences Department, characterized the ground motions. The geotechnical studies were performed by Faiz Makdisi of Geomatrix Consultants, under the direction of Robert K. White, PG&E Geosciences Department.
The PG&E Geosciences Department is responsible for project management and quality assurance of these studies, under the direction of William U. Savage. Lloyd S. Cluff, Director of PG&E's Geosciences Department, was responsible for the overall direction of the project.
A Seismic Hazards Consulting Board, which consisted of individuals eminently qualified in the appropriate subject areas, actively participated in site selection, evaluation of investigative methods, review of work in progress, and review of the results of the studies reported in this section. The members of the consulting board are Clarence R. Allen, Professor Emeritus, California Institute of Technology; Bruce A. Bolt, Professor Emeritus, University of California, Berkeley; I. M. Idriss, Professor of Civil Engineering, University of California, Davis; and Robert A. Kennedy, Consultant.
A letter from the Seismic Hazards Consulting Board follows these acknowledgments.
Alfred J. Hendron, Jr., Professor Emeritus, University of Illinois, was a special consultant on geotechnical engineering and slope stability.
Paul Somerville, Walter Silva, and Ann Becker participated in the ground motions studies.
Table B-3. Interpretation of Bedding in Boreholes, ISFSI Study Area Boring 00BA-1 WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angle0') angle(2) Bedding (Appendix B) (Appendix E) Review of Core(3) Attitude(4)
Depth Description Depth Description (strike, dip) (feet) (feet) 23.0- Four joints with thin 23.1 Moderately steep joint Not checked N25 0 E 23.2 clay coatings (altered and thin clay (?) bed, 9 0 NW zone) 295°, 90 (fair) 34.0- Dolomite to dolomitic 34.0- Massive rock with Clear bedding N45°W, 38.0 sandstone, laminated 38.0 laminations, slightly laminations, 14 0 SW bedding, dips 00 etched surface at 36.9, dips 110, azimuth 224 2250, 140 (good) measured from dip direction in televiewer 39.0 Dolomite to dolomitic 38.1 Slightly etched surface Excellent bedding, 100 N50 0 W, sandstone, laminated in massive rock with 10 0 SW bedding, laminations 00 dip 2200, 100 (good) 45.0- Dolomitic sandstone, 45.2 Color lamination in Well defined parting N85°W, 48.5 laminated bedding, massive rock, surface at 48.8 feet along 100S dips 0-7o 1850, 150 (fair) bedding, with fossils on bedding up to 0.2 inches, dips 100 55.6- Clay seam (0.7 foot) 54.9- Clay bed with sharp, Core not available; N82°W, 56.3 with planar rock 56.2 tight rock contacts, removed for testing 11-160S contacts, bedding etched, top dips 50, 188°, 200 (N) bottom dips 5' Remeasured dips: (good) top 110, bottom 160 (good) 59.0- Dolomitic sandstone, 57.0- Hard rock with steep to Good bedding at 59.7 N42 0 W, 61.0 bedding (?) at 59.7 60.5 moderately steep feet, dips 16-18', 16 0 SW dips 100 fractures, vague azimuth of 228' laminations measured from fracture orientation (good) 79.5 Stiff, silty clay seam 79.2 Possible thin clay along 2-4 mm clay bed dips N61E, (1/8-inch) on joint, bedding or joint, etched 160 11-16 0 NW dips 100 below 3310, 12 0 (N) Checked dip: 110 (fair) 105.4 Clay seam (1/4 inch) 105.0- Clay seam, etched, No clay found in core; N13°W, along fracture, 105.3 sharp irregular top, appears that clay washed 12 0 SW dips 150 smooth bottom contact, out during drilling 2570, 120 (N) (good) 106.5 Silty clay (1/8-1/4 106.4 Tight bedding with Not checked N20°W, inch), joint, discoloration 18°SW (?) dips 100 248-253° (N), 17-18' (N) (fair) 140.0- Sandstone, changes to 140.4 Thin clay (?) bed, partly Thin clay bed between NIO 0 W, 141.0 laminations
@ 140.9 etched, 2600, 4' (fair) runs, dips -90; not 4 0 SW I_ I I accurate Diablo Canyon ISFSI Data Report B, Rev. 0 B-15 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Boring OOBA-2 WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angle ) angle 2) Review of Core(') Bedding (Appendix B) (Appendix E) Attitude(4)
Depth Description Depth Description (strike, dip) (feet) (fe etL) ____________
_____ 00.0- No bedding No bedding No bedding recognized 55.0 recognized recognized Boring 01 CTF-A WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angleM) angle(2) Review of Core(3) Bedding (Appendix B) (Appendix E) Attitude&4) Depth Description Depth Description (strike, dip) (feet) (feet) 8.0- Coarse to fine grained 8.8-8.9 Two subhorizontal, Core not available; N53°W, 9.4 sandstone slightly open to etched removed for testing 6°SW (?) partings on bedding (?), lower parting 2170, 60 (N) (poor to fair) 12.4 Fine grained to coarse 12.4- Two subhorizontal, Broken sandstone N88°E, grained sandstone 12.6 slightly open to etched 7°S (?) partings on bedding (?), upper parting 1780, 70 (N) (poor to fair) 32.4- Soft clayey sand, 32.7- Soft clayey (?) zone, Core not available;
?? 32.6 bedding (?), dips 300? 33.5 etched, irregular removed for testing contacts, attitude not evident on image. I Diablo Canyon ISFSI Data Report B, Rev. 1 B-16 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Boring 01-A WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angle t 1) angle(2) Review of Core(3) Bedding (Appendix B) (Appendix E) Attitudet 4) Depth Description Depth Description (strike, dip) (feet) (feet) 37.7- Two clay (1 mm) 36.7 Low to moderate Not checked N40°W, 37.8 coatings on joints, dips dipping joint or bedding 20 0 SW 20-300 (?), etched 224, 27, (N) remeasured orientation 2300, 20' (fair to good) 42.1 Sandstone, no 41.0- Textural change, Not checked N 19°W, recovery 41.1 etched, bedding (?) with 23 0 W clay (?) 1 _ _ _ 2510, 23' (good) 54.9 Silty clay with sand 54.1- Low-angle bedding Could not confirm N69 0 E, and gravel (1 inch), 54.3 with textural change, orientation, but modified 7 0 NE bedding (?) dips 200 etched and eroded, 1/2- pick appears reasonable to 1-inch clay bed (?) 0210, 70 (N) 55.8 Faults with thin clay 55.3 Bedding (?), etched, Not checked N44W, coatings, slickensides, with thin clay (?) bed 23 0 SW dips 8-20' 226, 270, (N) remeasured dip 200, 270 (fair) 58.8 1 cm clay layer, dips 58.5 Subhorizontal clay Not checked NI l°W, 200 layer, eroded and 22 0 W etched, irregular, 1/4 1/2 inch thick, bottom 2590, 220 (N) (fair) 63.0- Fine grained dolomitic 64.7 Slightly etched bedding Bedding surface in core N14-W, 66.0 sandstone
(?) in massive rock with dips at 11 110 W broad color laminations 2560, 120 (N) (good)Diablo Canyon ISFSI Data Report B, Rev. 1 B-17 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Boring 01-B WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angle") angle(Z) Review of Core(3) Bedding (Appendix B) (Appendix E) Attitude(4) Depth Description Depth Description (strike, dip) (feet) (feet) 25.0- Medium grained 26.1 Tight bedding plane Not checked N55°E, 27.0 sandstone, joint at 26.2 (?), slightly etched, in 9 0 NW dips 0' zone of vague color laminations 3250, 90 (N) (fair) 32.5 Medium grained 32.0- Possible bedding, Two good laminations Ni 0°W, dolomitic sandstone 32.2 etched to partly open, within coarser rock, 10 0 SW 2580, 22, (N) azimuth, -N50°W, dip remeasured 10-150 2600, 50 (N) (fair) 37.7 Gradational contact 37.0 Sharp textural change Not checked N6E, between medium to from hard fractured 7 0 W coarse grained rock to massive etched sandstone, dip not rock, bedding, indicated 2760, 70 (N) (good) Boring 01-C WLA Descriptions from Original Description from NORCAL Televiewer Image Interpreted Log of Rock Boring including including dip azimuth and dip Bedding dip angleM') angle(2) Review of Core(3) Attitude(4) (Appendix B) (Appendix E) (strike, dip) Depth Description Depth Description (feet) (feet) 13.0- Sandstone, medium to 13.8 Bedding, etched, Not checked N49 0 W, 14.0 fine grained 2210, 130 (N) (fair) 13 0 SW 16.3 Clay film on joint, 15.9 (?) Low-angle bedding, Surface in core not N73°W, dips 150 etched, with clay (?) confirmed as bedding, 15 0 S (-1/8 inch) dips16-170 1970, 150 (N) (good) 23.8 Joint, dips 50 23.7- Bedding, etched, with Core not available; N66 0 W, 23.8 clay (?) (-1/4 inch) removed for testing 150 SW 2280, 100 (N) Remeasured orientation:
-204°, 150 (fair to good)Diablo Canyon ISFSI Data Report B, Rev. 1 B-18 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Boring 01 -D WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angleM' angle(2) Review of Core(3) Bedding (Appendix B) (Appendix E) Attitude(4) Depth Description Depth Description (strike, dip) (feet) (feet) 36.0- Fine to medium 36.9- Two subhorizontal Not checked N20 0 E 39.0 grained sandstone with 37.1 fractures, open and in 5°NW crushed zones, joints part tight, bedding (?), dip 00 and steeply bottom 2900, 50 (N) (fair) 55.0- Crushed zone with 53.4- Eroded and etched zone Sandstone layers and N33°W, 55.5 clay, joint at 55.2 54.9 (clayey?), rough contact with dolomite 1 l 0 NE bedding (?) at base dip 100 1__ 1__ 0570, 110 (N) (good) Boring 01-E WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angleM) 2) Review of Core(3) Bedding (Appendix B) (Appendix E) Attitude(4) Depth Description Depth Description (strike, dip) (feet) (feet) 46.5- Sandy dolomite to 46.5- Unfractured, hard rock, Irregular bedding NS, 48.0 dolomitic sandstone; 48.0 weak laminations laminations at 47.5 feet, 8 0 E horizontal to 0900, dip 80 measured subhorizontal laminar from fracture orientation banding on televiewer (good) 48.0 (same as above) 48.0 Top of thin (0.1 feet) Core not available; N60 0 E, dark bed (clay?), removed for testing 1 0°NW(?) 3320, 17 (N) remeasured
-330', 10' (fair) 48.8 (same as above) 48.8 Bottom of moderately Core not available; EW, dark bed (0.7 feet), removed for testing. But 3°N parallels the base of the @ 50.5 feet bedding dark bed at 48.1 feet laminations in core dip 3600, 40 (fair to good) 30 _Diablo Canyon ISFSI Data Report B, Rev. I B-19 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Boring 01-F WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angle°) angle(") Review of Core(3) Bedding (Appendix B) (Appendix E) Attitude(4) Depth Description Depth Description (strike, dip) (feet) (__feet) _ 6.8 Clay film (<1/16 6.6 Partly open joint with Not checked N70°W, inch), joint, dips 200 thin clay (?), shallow 9 0 SW bedding (?) 2000, 90 (fair) 94.3- Clayey, silty crushed 93.2 Subhorizontal joint Thick clay (1/4- 1/2 EW, 94.4 rock with clay bed along bedding with 1/4 inch) over 1/4-inch-140S (0.5-1 cm thick ('-'A inch clay (?), etched thick, white, moderately in)) 1800, 150 (N) (good) soft calcite vein at 94.8 dips 0-10' feet, dips 140 117.0 Clay layer (1 cm), 116.4 Subhorizontal bedding, Core not available; N70°W, bedding (?) dips 8-120 etched, possible thin removed for testing 6-12 0 SW clay (-1/8 inch) 2000, 50 (N) Remeasured dip: 60 (good) Boring 01-G WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angle(l) angler2) Review of Core(3) Bedding (Appendix B) (Appendix E) Attitude'4) Depth Description Depth Description (strike, dip) (feet) (feet) I 18.7 Clay seam (1/2-3/4 18.5 Subhorizontal, tight Core not available; N22-W, inch) above broken bedding laminations removed for testing 13 0 SW rock zone on bedding possible thin (<1/4 (?), top horizontal, inch) clay (?), bottom dips 0-50 245-251°, 11-14° (N) average 248', 130 (N) (fair to good) 25.4 Joint with clay 25.0 subhorizontal bedding, Not checked N78°W, coatings (<0.5 inch), tight with thin clay (?) 150S dips 0-i150 (<1/8 inch), 192, 15 (N) (fair) 29.1 Joint with very thin 28.8 Bedding (?), partly Not checked N60°W, film, dips 00 broken out in zone of 12 0 SW massive rock -210, 120 (fair) 56.3 Clayey fracture zone 55.8- Steep joints and Red brown laminations Unknown parallel to laminations, 57.5 broken rock, localized dip 5-80 strike, dips laminations dip 0-100 clay (up to -1/2 inch) 5-80 1 on joint Diablo Canyon ISFSI Data Report B, Rev. 1 B-20 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Diablo Canyon ISFSI Data Report B, Rev. I Boring 01-H WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angle") angle(2) Review of Core(3) Bedding (Appendix B) (Appendix E) Attitude t 4) Depth 1 Description Depth Description (strike, dip) (feet) 1(feet) 39.4 Two very thin clay 39.4- Subhorizontal bedding, Three thin clay beds, N30 0 W, layers between 41.2 slightly etched, with dip 150 15 0 SW fracture blocks dip 300 thin clay (?), 253-284, 2 (N) Remeasured orientation on clay bed at 41.2 feet: -240', 50 (fair) 58.7 Fine to medium 58.7 Thin bed Not evident in core. N59°W, grained dolomitic 211, 130 (N) (fair) 130SW sandstone, @ 58.9 feet clay layer, 0.01 feet thick on 'joint' dips 100 82.3 Clay seam (0.05 feet 81.4 Subhorizontal bedding Not checked N45 0 W, thick) on joint, dips 00 laminations, tight, no 12 0 SW clay evident, 225, 120 (N) (fair) 89.6 Sandstone 88.8 Bedding, textural 2 mm clay bed twisted N67°W, change 203, 11 0 (N) by drilling 1 1 0 SW (fair to good) 94.5 Dark gray clay layer 93.6 Subhorizontal bedding, Highly fractured, clay N38-W, (0.2 inch), dips 10-30* eroded with clay (?) layer not found 21 0 SW 202, 20 (N) Remeasured:
1 1 2320, 21' (good)B-21 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Boring 01-I WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angle0') angle(2) Review of Core(3) Bedding (Appendix B) (Appendix E) Attitude(4)
Depth Description Depth Description (strike, dip) (feet) (feet) 33.9 Clay film (1/16 inch) 34.9 Subhorizontal lamination, Not checked N39°E, on bedding, joint (?), tight to partly eroded 6 0 NW dips 100 bedding, 3090, 60 (N) (good) 43.1 Clay on joint (1/4 43.4- Thin clay, eroded and Not checked N55°E, inch), dips 200 43.6 etched along bedding(?), 18 0 NW 325', 18° (N) (good) 45.6 Clay bed (2 cm), dips 46.2 Well imaged thin clay, Not checked N54-E, 10-15* etched, bedding parallel, 14 0 NW 3240, 140 (N) (good) 48.1 Clay seam (1 cm) on 48.8 Subhorizontal joint/clay Not checked N50-E, joint associated with seam (1/4-1/2 inch), 13 0 NW CaCO 3 vein, dips 10- etched, 200 320', 130 (N) (good) 57.2 Sandy crushed zone 57.6- Subhorizontal, planar Crushed zone, remnant N25°E, 57.9 opening along eroded soft bedding dips 150 8-15°NW rock zone (1/2 to 1 inch); thin clay (?) along base, bedding, near bottom of clay bed 295', 80 (N) (fair to good) 86.0- Dolomitic sandstone, 86.8- Clear laminations in hard Bedding laminations N15°E, 87.0 laminations dip 12-200 88.5 rock, near vertical fracture dip 15', azimuth of 15 0 W 285' measured using fracture orientation (good) 89.5- Dolomitic sandstone 89.2- Clear lithologic banding Bedding laminations N15 0 E, 89.8 90.7 in unjointed, hard rock dip 13-14' 14 0 W 276, 180 (N) 285, 200 (N) (fair)Diablo Canyon ISFSI Data Report B, Rev. I B-22 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Boring 01-I (continued)
WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angle() angle t 2 Review of Core(3) Bedding (Appendix B) (Appendix E) Attitude(4)
Depth Description Depth Description (strike, dip) (feet) (feet) 102.0- Very fine grained to 102.0- Hard rock with Laminations N45°E, 105.0 fine grained dolomitic 105.0 laminations and two dip 130 (fair to good) 13 0 NW sandstone, well near vertical fractures, defined laminations at 103.7 3150, 11" 106.6 Clayeylsilty/sand seam 106.4 Subhorizontal clayey Clay bed not found in N 19 0 W, (2 cm), bedding, seam (1 to 2 inches core, but bedding 12-14°W dips10-12o thick), eroded and laminations one foot etched along bedding above and below dip 12 top 2660, 16' (N) 140 bottom 2510, 17' (N) (good) 123.8- Clayey sandstone bed 124.1 Irregular bedding Not checked N46°W, 124.0 above coarse, 0.1 -foot- contact between broken 16 0 NE thick sandstone bed, rock and soft, granular dips 10-20' rock, eroded, 0440, 160 (N) (fair) 130.3 Stiff clay seam (1/2-1 130.8 Bedding with clay (?) Not checked N12°E, cm) along bedding, slightly etched, 3E dips 100 1020, 30 (N) (fair) 131.0 Joint with clay, dips 131.6 Bedding with thin clay, Not checked N8 I -E, 200 subhorizontal, 80S 1710, 8- (N) (good) 156.1 Shaley seam (1/4 inch) 156.5- Softer rock zone, Bottom of clay bed N65 0 E, with slickensides 156.8 eroded and etched, washed out during 12-1 8°NW along bedding contact, subhorizontal, possible drilling.
dips 15-18 clay at base of zone, bedding, 3350, 12' (N) (good) 171.0- Crushed zone with 170.0- Clear laminations and Bedding dips 12', at N20 0 E, 171.2 silty clay in joint (1/8 173.0 steep, partly open joints 170.5 feet azimuth of 12 0 NW inch), possible slough with clay (?), -294' measured using at bottom, dips 100 2850, 120 (N) (good) fracture orientation 172.5- Dolomitic sandstone, 171.0- Clear lithologic Bedding on two beds, N15 0 E, 173.1 laminations dip 10-12' 173.5 banding and near dips 110, 15' (azimuth I loW vertical joint measured using fracture 272-285° (N), orientation confirms 11-12'(N) strike in televiewer)
Diablo Canyon ISFSI Data Report B, Rev. I B-23 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Boring 01-I (continued)
WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angleM') angle(2) Review of Core(3) Bedding (Appendix B) (Appendix E) Attitude Depth Description Depth Description (strike, dip) (feet) (feet) 173.8- Dolomitic sandstone, 173.5- Clear fine lithologic Core has good N30 0 E, 175.0 thick laminations 176.6 banding, typical: laminations, bedding 10-13 0 NW dip -10' 2960, 150 (N) dips 10-13', 2850, 14° (N) 292-, 13- (N) 3090, 100 (N) 316, 0 13 0 (N) average 300', 130 good) 185.0- Two clay beds (2 cm; 185.7- Subhorizontal clay bed Dip on bottom of clay N47°E, 185.3 1 cm) with crushed 186.1 (0.4 feet thick), etched, bed is 12-14' 12-14ONW zone between, dips 10- Bottom 200 3170, 180 (N) (good) 188.5 Clay film (1/16 inch) 188.0- Solid rock with color Not checked N3 0 W, on joint, dips 100 189.0 laminations, slightly 7 0 E etched, 2670, 70 (N) (good) 198.4- Dolomitic sandstone, 196.0- Massive rock with color Well defined N20°E, 199.8 laminations 201.0 laminations, slight laminations, 12 0 NW dip 5-12* etching at 197.1 dip 140, 110 Following are typical: 2950, 90 (N) 2910, 10 0 (N) 2890, 90 (N) average 2900, 90 (good) 215.8- Crushed zone with 215.9- Irregular, subhorizontal Not checked N4-E, 216.0 clay seam, 216.4 bedding with brown 29 0 W slickensides clay (1 inch), eroded and etched, bottom contact 2740, 29 (N) (good) 236.3 Stiff clay seam (1 cm) 236.8 Subhorizontal clay Bedding in core dips 12- N17 0 W, on bedding, dips 150 (1/4-1/2 inch) along 130, azimuth measured 13 0 SW laminations, etched using fracture orientation and squeezing into confirms strike from hole televiewer 2530, 130 (N) (good)Diablo Canyon ISFSI Data Report B, Rev. 1 B-24 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Boring 01-I (continued)
WLA Descriptions from Original Description from NORCAL Televiewer Image Log of Rock Boring including including dip azimuth and dip Interpreted dip angle0 1) 2Review of Core(3) Bedding (Appendix B) (Appendix E) Attitudeý4) Depth Description Depth Description (strike, dip) (feet) (feet) 252.4- Bed of medium to 252.9- Washed out zone, Undulating laminations, N45 0 W, 252.7 coarse grained 253.2 friable sand (clay ?), dip 10-13' 10-13 0 W sandstone, contact bottom bedding dips 10-1 10, bedding 1840, 40 (N) laminations dip 100 remeasured 2250, 70 (fair to good) 259.2- Very fine grained 259.1- Lithologic banding; Irregular laminations at N12°W, 259.6 dolomitic sandstone, 259.5 Following are typical: 259.0 dip -18*, parting 12'W subhorizontal bedding 254-, 120 (N) surfaces at 259.9 feet dip laminations dip -10' 262-, 130 (N) 160 (good) 283.6- Very fine-grained 286.3- Laminations Good laminations dip N33°E, 286.3 sandstone, 286.7 299-315°, 13 (N) 110; azimuth of 303' 1 1°NW laminations, bedding (fair) measured using fracture dip 0* orientation 289.9- Clay seam/bed (1/2-1 290.4 Subhorizontal clay bed Not checked N62E, 290.0 cm), dips10-150 (1/4-1/2 inch) along 18 0 NW laminations, etched to partly open, irregular 3220, 180 (N) (fair) 316.0- Very fine grained 316.0- Laminations Laminations dip 10-130, N9 0 E, 316.6 sandstone, laminations 317.0 0 2730, 15 (N) with few irregular 12 0 W 2790, 120 (N) (good) laminations up to 180 Diablo Canyon ISFSI Data Report B, Rev. I B-25 of 244 Table B-3. Interpretation of bedding in boreholes, ISFSI Study Area (continued)
Notes: (1) Description and depth (in feet) of feature described on log of rock boring by field geologist.
Dip angle measured from core with protractor by field geologist.
In some cases, no field measurement was taken. Note that some features such as joints have been reinterpreted as bedding from subsequent review of core and/or interpretation of televiewer image. (2) WLA description and depth (in feet) of feature observed in NORCAL Televiewer image of boring. Dip azimuth and dip angle measurements taken from NORCAL interpretation are designated with (N). NORCAL measurements are described in DCPP ISFSI SAR Section 2.6 Topical Report Appendix E. All other dip azimuth and dip angle measurements were obtained by WLA from televiewer image and represent either bedding not picked by NORCAL or remeasured by WLA where noted. WLA physically measured dip and dip azimuth on televiewer image hard copy in the following manner: Bedding occurs as sinusoidal form on unfolded borehole image. The dip direction is taken as the lowest point on the sinusoidal curve. The dip angle is calculated using the parameters of (1) measured amplitude of the sinusoidal curve (h) and (2) the boring diameter (d) in the equation tan (dip angle) = h/d. A good, fair, or poor rating was assigned to the bedding attitude to convey the quality of measurement and confidence that the feature in the televiewer image represents bedding.
(3) Comments from reinspection of core samples including dip measurements where noted. Dip azimuths are measured and noted where core could be oriented using attitudes of prominent fractures or joints obtained from televiewer images. "Not checked" refers to bedding attitudes that were interpreted from televiewer images following the last reinspection of the core. (4) Strike and dip of interpreted bedding. The interpreted bedding represents the best information obtained from field logs, NORCAL televiewer images, and reinspection of core samples. For example, the interpreted strike of bedding may be obtained from the televiewer images, but the corresponding dip may be taken from original field measurements of core samples, televiewer images, or measurements of core during reinspection, whichever is considered highest quality/confidence.
Diablo Canyon ISFSI B-26 of 244 Data Report B, Rev. 1 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings Boring 98BA-1 Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay (feet) Description (deg.) (feet) Description rock Fault Bed zone 11.0- "Clay stringers" No televiewer image ? 11.4 26.6 Thin clay film (not clay bed) 0-5 /,/? ? 65.0- Clayey joint coatings 5-30 V1 66.0 66.6- Very soft clayey zone (not -- / 67.0 clay bed) 69.4- Clayey rock, 1/8 inch seams; ? ?"? 70.0 slickensides, disturbed 87.0 Silty clay in shoe -- ? 90.4 Clay with slickensides, 25 / I joint 91.5 Clay coatings with 30 / slickensides, joint 93.7 Clay films, polished, joint 0 _/ /? 97.6 Clay seam on joint with 25 / slickensides 99.1 Clay on joint with 25 / slickensides 142.8 Joint, 1/16 inch clay, polished 10 ¢_? /? 145.1- Clayey zone (not beds) -- / 145.4 162.0- Soft clayey rock zone Low 162.2 angle 165.3 Joint with clay, polished 5 / /? 170.7 Joint with clay films and 0 1/ 1/? slickensides 175.8 1.2 inches clay zone 15 _? 192.4- Clay films with slickensides 20 / 192.6 (shear zone) 194.2 Joint with clay films, 0 /T 7? slickensides 203.3 Bedding with clay seams 5-10 /? /? (films) in 0.7 inch-wide
_ breccia Diablo Canyon ISFSI Data Report B, Rev. 1 B-27 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 98BA-2 Log of Rock Boring NORCAL Televiewer Imagef Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay DphDescription FaultthDecriBed oc (feet) (deg.) (feet) Description rockBed zone 5.9 Joint with clay seam 10 No televiewer image _ _ ? *? 11.3 Joint with clay seam 30 ¢" 13.3 Joint with clay film 30 V_ 36.5 Joint with clay film 15 " 38.9 Joint with clay film 15 ¢" 53.4 Joint with thin clay 5 / /? 58.2 Joint with thin clay, 30 V/ slickensides 59.6 Joint with thin clay 5 / /? 63.6 Joint with thin clay, 10 V /? slickensides 67.3 Joint with clay seams with 10 / /? shears 128.5 Joint with clay films and 0/ /? slickensides Boring 98BA-3 Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Jon Clay (feet) Description Description rock Fault Bed (fe)(deg.) (feet) zoe Fault Bed N zone No clay beds described No televiewer image I Diablo Canyon ISFSI Data Report B, Rev. I B-28 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring OOBA-1 Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay (fe)Description Description rock Jon/ Ca (feet) (deg.) (feet) Fault Bed zone 23.0- Four joints with thin clay 0 23.1 Thin clay (?) bed, 23.2 coatings (altered zone) N25°E, 9°NW and moderately steep joint 30.2 Clay seam (1/8 inch), 0? 29.4- Moderately steep joint, / bedding? 30.2 etched, irregular with clay(?) 51.2 Crushed clayey rock -51.0- Irregular joint, tight " 51.6 54.5 Stiff clay (1/8 inch) -0 53.5- Steep filled joint, irregular
/ 54.5 tight with clay 55.6- Clay seam (8.4 inches) with -5 54.9- Clay bed with sharp, tight / 56.3 planar rock contacts, 56.2 rock contacts, etched, ,bedding N82oW, 11°-46-S 69.2- Crushed zone with silt, -- 69.2- Steep fracture, eroded, $ 69.6 some clay 69.8 clay (?) 79.5 Stiff, silty clay seam (1/8 10 79.2 Possible thin clay along it inch) on joint bedding or joint, etched below N61 0 E, 11V-160 NW 105.4 Clay seam (1/4 inch) along 15 105.0- Clay seam, etched, / fracture 105.3 irregular top, sharp, smooth bottom contact, N13°W, 12oSW 106.5 Silty clay (1/8-1/4 inch), 30 106.4 Tight bedding with V9 joint discoloration N20°W, 18 0 SW 109.5 Clay lined joint 10 108.9- Tightjoint V/ 109.0 140.0- Sandstone, changes to -140.4 Thin clay (?) bed, partly / 141.0 laminations
@ 140.9 etched NI0°E, 4*SW 145.3- Crushed, broken zone with 144.3- Steep joints, tight with / 145.7 clay coatings (1/4 inch) _ 145.7 clay (1/4-1/2 inch)Diablo Canyon ISFSI Data Report B, Rev. I B-29 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring OOBA-2 Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay (eet) Description (deg.) (feet) Description rock Fault Bed (feet) (zone 29.8- Crushed zone 29.8- Subhorizontal soft clay (?) / 30.0 30.2 zone, etched, irregular 1contact 40.4 Crushed zone 40.4- Moderately steep, joint, / 40.8 partly open and etched, with thin clay (?) 52.4 Clay (1/16 inch) on joint, 0 52.4- Tight, moderately steep / minor striations
_ 52.6 joint Boring OOBA-3 Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay DphDescription Dp ethDescription rock (feet) (deg.) (feet) zone Fault Bed zone 11.8- Clayey saridstone (not a clay No televiewer image V/ 12.8 bed) 22 Clay film on joint, polished 30 ¢" 26.5 Clay (1/16 inch) with 0 */ '/? slickensides, joint Boring 01CTF-A Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay DphDescription Dp ethDescription rock (feet) (deg.) (feet) zone Fault Bed zone 22.9 Clay film on joint, polished 30 22.6- Moderately dipping joint, V/ 23.0 tight, thin clay (?) 1 32.4- Soft clayey sand, bedding (?) 30 32.7- Soft clayey (?) zone, etched, / 32.6 33.5 irregular contacts 37.7 Clay (1/16 inch) on joint, 30 38.3- Tight, steep joints / polished, slickensides 40.7 38.2 Clay film on joint, end of -5 38.3- Tight, steep joints V/ core run 40.7 50.5- Clayey rock zone, not 10 51.1- Low-angle band (murky / 50.6 bedding clay 51.3 water)Diablo Canyon ISFSI Data Report B, Rev. I B-30 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-A Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay DphDescription Description rock (feet) (deg.) (feet) zone Fault Bed 15.2- Clay (0.4 inch) in fracture 25-30 15.2- Moderately dipping joint, 15.4 15.4 eroded, with clay (?) 1 29.9 Clay layer (0.6 inch), joint 30 29.6- Moderately dipping joint, / 29.9 etched to eroded, thin clay (?) (image distorted) 37.7- Two clay coatings (1/16 inch) 20-30 36.7 Low to moderate dipping ? V/? 37.8 on joints joint or bedding (?), etched N40°W, 20°SW 42.1 Sandstone, no recovery -41.0- Textural change, etched, ? 41.1 bedding (?) with clay (?) 42.2- Moderately dipping joint V? 42.3 below broken, eroded zone with thin clay (?) N19 0 W, 23°W 46.0 Faults with clay coatings, 18-25 44.2- Eroded and etched zone / slickensides 49.2 irregular, near vertical joint 48.2 Clay layer (1 inch) in 0 44.2- Eroded and etched zone /2 ? _ broken zone 49.2 irregular, near vertical joint 52.0- Sandstone with joints 0 53.3 Low-angle joint, eroded with 53.9 _thin clay 54.9 Silty clay with sand and 20 54.1- Low-angle bedding with / gravel (1 inch), bedding? 54.3 textural difference, etched and eroded, 1/2-to 1 inch clay bed (?) N69°E, 7°NE 55.8 Faults with thin clay 8-20 55.3 Bedding (?), etched, with V"? coatings, slickensides thin clay (?) bed N 11N-W, 22°W 58.8 0.4 inch clay layer 20 58.5 Subhorizontal clay layer, V"? eroded and etched, irregular, 1/4-1/2 inch thick, bottom N1 VW, 22°W_Diablo Canyon ISFSI Data Report B, Rev. I B-31 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-B Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay Det esrpio i DphDescription rock Fal Be (feet) Description (deg.) (feet) oe Fault Bed zone 43.3 Trace clay on two joints 0 43.3 Broken rock zone V/ 48.7 Trace clay on joint 30 48.7 Broken rock zone _/ Boring 01-C Log of Rock Boring NORCAL Televiewer Image" Interpretation* (Appendix B) (Appendix E) Depth Description Dip Depth Description Clayey Joint/ Clay (feet) (deg.) (feet) rock Fault Bed zone 16.3 Clay film on joint 15 15.9(?) Low-angle bedding, etched, V/? with clay (?) (-1/8 inch) N73°W, 15°S 23.8 Joint 5 23.7- Bedding, eroded, with clay "/ 23.8 (?) (-1/4 inch) N66°W, 15°SW 41.1- Clay films on two joints, 20-30 40.3- Moderately steep joint, " 41.4 slickensides 40.5 etched, no visible clay 44.1 Clay (0.2 inch) on bedding? 0-5 43.6 Subhorizontal bedding, etched to eroded, thin clay (?), irregular 55.8- Sandstone some clay 5 54.9 Subhorizontal, irregular V9 9 56.2 bedding (?), etched to eroded, clay (?) 65.3 Soft clay (1/4 inch) on joint, 5 65.0 Moderately steep joint, / bedding (?) etched, slight clay (?) (water in hole, image fuzzy)Diablo Canyon ISFSI Data Report B, Rev. I B-32 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-D Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay Det esrpio i DphDescription rock Fal Be (feet) Description (deg.) (feet) o Fault Bed zone 26.5- Joint, crumbly zone 30 25.9- Eroded zone between two 27.0 26.9 moderately steep joints, clayey (?), rock (6.25 inches wide) 55.0- Crushed zone with clay, 53.4- Eroded and etched zone /9 55.5 joint at 55.2 54.9 (clayey?), rough bedding (?) at base N33°W, 1 IN Boring 01-E Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Description Dip Depth Description Clayey Joint/ Clay (feet) (deg.) (feet) rock Fault Bed zone 12.85 Clay layer (1/8 inch) 10 12.1- Vein, joints, etched, / 12.7 clayey (?) 20.8 Clay gouge (1/16 inch), 30 20.4- Shallow joint, etched, V/ joint 20.5 irregular, with thin clay (?) 23.0- Zone of clay coated joints, 30 23.1- Moderately steep, tight to / 25.0 polished, with rubble 24.3 slightly etched, joints 71.7 Clay film on joint 30 71.4- Steep, tight joint (hole has / 72.1 water, image fuzzy) 77.4 Clay filled joint 0 77.0- No joints evident (hole has / 78.0 water, image fuzzy)Diablo Canyon ISFSI Data Report B, Rev. I B-33 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-F Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay (feet)Description (deg.) (feet) Description rock Fault Bed zone 5.5 Clay film (<1/16 inch),joint 0 4.7- Fractured zone with clay (?) / 16.6 6.8 Clay film (<1/16 inch), joint 20 6.6 Partly open joint with thin ¢? /? clay (?), shallow bedding (?) N70oW, 9°SW 10.5- Sandy, clayey rock zone 10.2- Partly etched zone / 10.8 _ 10.5 16.1- Fractured clayey zone 15.2- Weak, etched and eroded ¢1 16.3 16.4 rock 29.2 Clayey crushed rock mixed 29.0- Weak, etched zone / with harder rock fragments
_ 30.2 35.5- Clayey fractured zone, 35.0- Soft, partly etched, locally / 38.0 altered _ 38.0 fractured rock 43.8- Clayey fractured zone, 0-10 43.7- Fractured rock with tight, " / 44.4 altered 80-90 45.3 subhorizontal joint and steep, partly open joints, some clay (?) 46.6- Clayey fracture zone, 0 46.0- Steep, eroded joints and 46.8 altered, bounded by joints 47.0 fractured rock with clay 57.5- Clayey zone along possible 5-15 57.9 Subhorizontal, tight /? 9 ? 57.7 bedding lamination, slight clay (?) (<1/16 inch) 58.6 Clay films on joint with 20 57.0- Tight joints and ? slickensides, possible 59.0 subhorizontal laminations, bedding possible clay (<1/16 inch) 58.6- Clayey lens in rock and clay 10 58.7- Moderately dipping joint, / / 58.8 films with slickensides, joint 58.9 etched, with clay (?) (<1/16 inch) 94.3- Clayey, silty crushed rock 0-10 93.2 Subhorizontal joint along / 94.4 with clay bed (1/4-1/2 inch bedding, etched, with 114 thick) inch clay (?), etched EW, 14-S 98.0- Broken zone with clayey- 70 98.0- Fractured zone with / 98.4 silty matrix 99.0 apparent softer rock pockets, eroded (clay ?)Diablo Canyon ISFSI Data Report B, Rev. 1 B-34 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-F (continued)
Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay (feet)Description (deg.) (feet) Description rock Fault Bed zone 103.8 Thin silt/clay coating on 20 103.0- Fractured zone with steep / joint 104.4 joints 104.4 Clay on joint 30 103.0- Fractured zone with steep 104.4 joints 105.5 Clay seam (?) (<-1/2 inch) in 65-80 105.0- Tight rock with few steep ? broken zone (clay in crushed 106.0 fractures, laminations, no .zone) clay seam evident 107.3 Trace clay on joint 20 106.5- Solid, unfractured rock, no ? 108.0 clay or joints evident 111.3 Trace clay on joint 20 1111.1- Moderately steep joint, "/ 111.4 irregular, partial thin clay (?) 111.9 Clay (<1/32 inch) on joint 0 111.5- Moderately steep, hairline ? 112.5 fracture in otherwise solid unfractured rock 117.0 Clay layer (0.4 inch) bedding 8-12 116.4 Subhorizontal bedding, (?) etched, possible thin clay (-1/8 inch) N70°W, 6 0-12°SW 124.8 Joint lined with 1/16 inch 30 123.6- Tight to open, steep / clay 124.5 joints, no clay evident 125.9 Joint with trace clay, 35 124.5- Tight, sound rock with few / polished 126.5 tight to locally open, steep I _fractures Diablo Canyon ISFSI Data Report B, Rev. I B-35 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-G Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay Deet) Description Description rock Fault Bed (feet) Description(deg.) (feet) zone ___t Be 8.6- Weak zone with clay, 7.6- Moderately steep joints, / 9.0 crushed 8.6 partly broken out, with thin clay (?), massive rock below 14.3 Clay lined joints 30 14.0- Tight, moderately steep / ,14.2 joint, no visible clay 18.7 Clay seam (1/2-3/4 inch) Top, 18.5 Subhorizontal, tight above broken rock zone on -.0; bedding laminations bedding (?) Base, possible thin (<1/4 inch 0-5 clay) (?), N22*W, 13*SW 25.4 Joint with clay coatings 0- 25.0 Subhorizontal bedding, V/ (<0.5 inch) '-15 tight with thin clay (?) (<1/8 inch), N78°W, 15°S 29.1 Joint with very thin film 0 28.8 Bedding (?), partly broken /? out in zone of massive rock N60oW, 12oSW 50.3 Zone of silty clay 49.2- Steep, partly open joints ? / 50.6 and broken rock 56.3 Clayey fracture zone 0-10 55.8- Steep joints and broken / parallel to laminations 57.5 rock, localized clay (up to -1/2 inch) on joint 67.2 Minor clay/silt laminations 67.0- Laminated tight rock with / 68.0 steep joint, no visible clay 75.6 Thin clay film on joints 30-40 1 Below televiewer log __ " Diablo Canyon ISFSI Data Report B, Rev. I B-36 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-H Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay DphDsrpinDp DphDescription rock Fal Be (feet) Description (deg.) (feet) o Fault Bed zone 10.0 Clay films 30 9.2- Moderately dipping joint / 9.4 partly broken out, with some clay (?) 39.4 Two very thin clay layers 10 39.4 Subhorizontal bedding, " between fracture blocks slightly etched, with thin clay (?), N30°W, 15WSW 40.3 Joint with thin clay coating 13 39.6- Massive, laminated rock 41.0 50.5 Clay "clast" (1/4-3/4 inch), 30 49.7- Massive rock, no clay " bedding parallel 51.6 evident, thin, slightly etched beds at 50.3 and 50.4 59.9 Clay layer (1/8 inch thick) 59.1- Subhorizontal softer rock ? 59.8 zone, etched contact, vague 67.2 Clay layer (1/8 inch thick) 30 66.7- Moderately dipping joint, / 66.9 slightly etched, with thin clay (?) (<1/16 inch) 67.4 Clay layer (1/8 inch thick) 30 66.7- Moderately dipping joint 66.9 with thin clay (?) .(<1/16 inch) 72.8 Clay on joint (1/16 inch 30 72.2 Irregular, thin clay (?) /? /? _ thick) layer in massive rock 82.3 Clay seam (3/4 inch thick) 0 81.4 Subhorizontal bedding ? laminations, tight, no clay _evident, N451W, 12°SW 89.6 Sandstone (1/16 inch clay 0 88.8 Bedding, textured change, /" bed twisted by drilling)
N67 0 W, 11°SW 94.5 Dark gray clay layer (1/4 10-30 93.6 Subhorizontal bedding, / inch thick) eroded with clay (?) _(-1/4 inch), N38oW, 21*SW Diablo Canyon ISFSI Data Report B, Rev. 1 B-37 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-I Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay DethDecrpio Dp ephDescription rock (feet) Description (deg.) (feet) zone Fault Bed 15.6 Clay on joint (0.2-0.4 inch) 10 15.0- Broken zone, clay (?) along V/ 16.0 joints 18.9 Clay on joint (1/16 inch) 0 17.8- Broken out zone along steep V 20.0 joints, clay (?) 20.2 Silty/clayey crushed rock 10-20 20.4- Broken, jointed zone zone (not clay bed) 21.0 33.9 Clay film (1/16 inch) on 10 34.9 Subhorizontal lamination, bedding, joint (?) tight to partly eroded bedding, N39*E, 6°NW 39.0- Crushed zone with silt, clay 37.9- Fractured zone, steep joints, / 40.0 films 40.1 partly broken out 43.1 Clay on joint (1/4 inch) 20 43.4- Thin clay, eroded and 43.6 etched along bedding (?), N55*E, 18°NW 45.6 Clay bed (0.8 inch) 10-15 46.2 Well imaged thin clay, V etched, bedding parallel, N54°E, 14°NW 48.1 Clay seam (0.4 inch) on joint 10-20 48.8 Subhorizontal joint/clay V1 associated with CaCO 3 seam, etched, with clay vein (1/4-1/2 inch), N50OE, 13 0 NW 57.2 Sandy crushed zone 57.6- Subborizontal, planar " 57.9 opening along eroded soft rock zone (1/2 to 1 inch); thin clay (?) along base, bedding, N25°E, 8*-15°NW 61.0- Crushed rock zone with 60.0- Steep joints with clay (?) V/ 61.4 some clay, not bedding 162.5 62.7- Crushed rock zone with silt 63.3- Moderately steep, smooth / 63.1 and clay, not bedding 63.9 joints with crushed and weak rock mixed with clay (?) in lower part 1(-2 inch thick)Diablo Canyon ISFSI Data Report B, Rev. I B-38 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-I (continued)
Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Dip Depth Clayey Joint/ Clay DethDecrpio Dp ephDescription rock g.) I (feet) Fault Bed zone 68.6- Clay zone with crushed -- 68.3- Moderately steep to steep / 69.2 altered rock (not bedding) 70.2 joints bounding I foot-thick, weak rock, deeply eroded with possible clay 70.8- Crushed zone with clay -- 70.5- Moderately steep / 71.1 70.8 fracture, partly open, with clay (?) 85.8 Trace clay on joint 20 85.4- Moderately steep, open / 85.6 joint, possible thin clay washed out? 90.1 Clay (0.1-0.2 inch) on 20 89.2- Massive unjointed rock / joint 190.7 with laminations 93.4- Three joints with trace clay 30 93.4- Steep joints, with thin / 93.9 94.6 clay (?), partly eroded and bounded by massive unjointed rock with color laminations 100.2- Trace clay on two joints 20 98.0- Fractured rock with steep / 100.6 100.8 open joints, discontinuous 106.6 Clayey/silty/sand seam 10-12 106.4 Subhorizontal clayey seam V1 (--3/4 inch), bedding (1 to 2 inches thick), eroded and etched along bedding N19-W, 12°-144W 108.9 Broken clay along joints 18-20 108.0- Broken rock zone with / 116.2 steep joints, clay (?) 110.0 Sandy clay (0.4 inch) at -- 108.0- Broken rock zone with / bottom of run, possible 116.2 steep joints, clay (?) slough I 123.0 Joint with 0.2 inch clay 20 121.1- Broken rock zone, / 124.1 subhorizontal fabric, possible thin clay (?) laminations 123.8- Clayey sandstone bed above 10-20 124.1 Irregular bedding contact / 124.1 coarse, 1.2 inch-thick between broken rock and sandstone bed soft, granular rock, eroded, N46°W, 16-NE Diablo Canyon ISFSI Data Report B, Rev. I B-39 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-I (continued)
Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay DphDescription Dp ethDescription rock (feet) (deg.) (feet) zone Fault Bed zone 127.6- Crushed clayey zone (2.4 20-35 126.5- Steep joints and broken " " 127.8 inches) 129.2 rock, partly open, with I Iclayey (?) zone at 127.8 130.3 Stiff clay seam (1/4-1/2 inch) 10 Bedding with clay (?) V/ along bedding slightly etched N12OE, 3YS 131.0 Joint with clay 20 131.6 Bedding with thin clay, subhorizontal, N81°E, 8°S 146.3 Clay (1/8 inch) on joint (or 20 145.2- Open, steep joint, eroded, ? drilling clay?) 148.7 possible washed-out soft rock or clay zone 151.4- Crushed silty/clayey zone, -- 149.5- Fractured rock, partly open / 151.9 part slough? 151.2 and etched 156.1 Shaley seam (1/4 inch) with 15-18 156.5- Softer rock zone, eroded ? slickensides along bedding 156.8 and etched, subhorizontal, contact possible clay at base of zone, bedding _N65°E, 12 0-18 0 NW 167.4- Zone with multiple clay 10 167.0 Thin clay (?), etched along / 167.8 seams (1/8-1/4 inch) along bedding bedding_ 171.0- Crushed zone with silty clay 10 170.0- Clear laminations and steep, / 171.2 in joint (1/8 inch), possible 172.0 partly open joints with slough at bottom clay N20°E, 12 0 NW 185.0- Two clay beds (0.8 inch; 10-20 185.7- Subhorizontal clay bed / 185.3 0.4 inch) with crushed zone 186.1 (4.8 inches-thick), etched between N47 0 E, 12 0-14°NW 188.5 Clay film (1/16 inch) on joint 10 188.0- Solid rock with color 189.0 laminations, slightly -----.etched, N3oW, 7 0 E Diablo Canyon ISFSI Data Report B, Rev. I B-40 of 244 Table B-4 Evaluation of Clay "Seams" on Low-Angle Fractures and Bedding, ISFSI Study Area Borings (continued)
Boring 01-I (continued)
Log of Rock Boring NORCAL Televiewer Imaget Interpretation* (Appendix B) (Appendix E) Depth Dip Depth Clayey Joint/ Clay Det) Description dip Det) Description rock (feet) (deg.) (feet) zone Fault Bed 197.0 Clay films on joint 0 196.0- Massive rock with color V? 198.0 laminations, slight etching at 197.1, N20 0 E, 12*NW 210.2 Crushed clayey, sandy zone -- 209.0- Broad color laminations and V / at top of crushed zone 211.0 near-vertical joint with clay (?) 215.8- Crushed zone with clay -215.9- Irregular, subhorizontal 216.0 seam, slickensides 216.4 bedding with brown clay (1 inch), eroded and etched, bottom contact N4 0 E, 29 0 W 223.1 Clay film on joint 0 221.1- Massive rock with weak VI? 223.8 color laminations, moderately dipping, tight .joint at 223.8 230.7 Irregular clay seam/bed (?) 5-15 230.2- Steep joint with clay (?) ? (0.4 inch) 231.0 230.9 Top of light color band, etched, clay (?) 236.3 Stiff clay seam (0.4 inch) on 15 236.8 Subhorizontal clay (1/4-1/2 bedding inch) along laminations, etched and squeezing into hole N17oW, 13°SW 245.1 Clay on join (0.4 inch) 0 244.8- Massive rock with a steep, / 246.2 tight to slightly open joint 289.9- Clay seam/bed (0.2-0.4 inch) 10-15 290.4 Subhorizontal clay bed / 290.1 (1/4-1/2 inch) along laminations, etched N62°E, 18 0 NW Note: Clay on fractures steeper than 30 degrees are not included because bedding has dips less than 20 degrees in the site area.1*Bedding attitudes from Table 21-1 Interpretation Categories Bold type highlights clay bed or possible clay bed shown on cross sections v/ Significant clay bed (> 1/4 inch thick, follows bedding; thickness in most cases taken from measurements on core) v/ Clay along bedding, joint or fault v/? Probable clay along bedding, joint or fault ? Possible clay along bedding, joint or fault Diablo Canyon ISFSI Data Report B, Rev. I B-41 of 244 Table B-5 Thickness Measurements of Clay Beds in Borings and Trenches i Boring Depth Trench Station Thickness (inches)a Notes on b (feet) (meters) minimum I maximum Thickness 98BA-1 98BA-1 98BA- I 98BA- I 98BA- 1 98BA- 1 98BA-1 98BA-2 98BA-2 98BA-2 98BA-2 98BA-2 98BA-2 0OBA-1 OOBA- I O0BA-1 O0BA-1 O0BA-1 OOBA-1 OOBA-2 0OBA-3 01-A 01-A 01-A 01-A 01-A 01-C 01-C 01-C 01-F 01-F 01-F 01-F 01-G 01-G 01-G Diablo Canyon ISFSI Data Report B, Rev. I 93.7 142.8 165.3 170.7 175.8 194.2 203.3 5.9 53.4 59.6 63.6 67.3 128.5 23.0-23.2 55.6 to 56.3 79.5 105.4 106.5 140.0 to 141.0 29.8-30.0 26.5 37.7-37.8 42.1 54.9 55.8 58.8 16.3 23.8 44.1 6.8 57.5-57.7 94.3 to 94.4 117 18.7 25.4 29.1 na na na na na na na na na na na na na na na na na na na na na na na na na na na na na na na na 0.06 0.06 0.06 0.06 0.25 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 0.06 8.40 0.12 0.25 0.12 0.06 0.12 0.06 0.06 0.06 0.50 0.06 0.25 0.06 0.25 0.06 0.06 0.06 0.25 0.12 0.12 0.12 0.06 0.06 0.06 0.06 0.06 1.20 0.06 0.06 0.12 0.12 0.12 0.12 0.12 0.06 0.12 8.40 0.12 0.25 0.25 0.06 0.25 0.06 0.06 0.12 1.00 0.12 0.50 0.06 0.25 0.20 0.06 0.06 0.50 0.40 0.25 0.12 0.06 1,2 1,2 1,2 1,2 1 1,2 1,2 3 3 3 3 3 1,2 3 1 1 1 1,2 3 1,2 1,2 3 3 1,2 1 3 1,2 1,2 6 6 1,2 Tofb.2 Tofb.2 Tofb-2 Tofb-2 Tofb, 2 Tofb.2 Tofb-2 Tofb.2 Tofb.2 TOfb.2 Tofb_2 Tofb.2 Tof.b 2 Tofb-I Tofb.I Tofb.I Tofb-, Tofb-I Tofb.i Tofb.2 Tofb.2 Tof 1Tofb.2 Tofb.2 Tofb.2 Tofb.2 Tofb.2 Tofb., Tofb.-2 Tofb.2 TofbI and TOfb.la Tofb., Tofb.-I TOfb.I na na na na I & I -I B-42 of 244 Table B-5 Thickness Measurements of Clay Beds in Borings and Trenches (continued)
Location Boring Depth Trench Station Thickness (inches)a Notes on (feet) (meters) minimum I maximum Thicknessb Subunitc 01-H 01-H 01-H 01-H 01-H 01-I 01-1 01-I 01-I 01-I 01-I 01-1 01-I 01-I 01-I 01-I 01-1 01-4 014 01-I 01-I 01-I 01-I 01-I T-I IA T-1 IA T-1 IB T-1 1C T-I ID T- 12 T-14A T-14A T-14B "T-i5 T-18A "T-19 Diablo Canyon ISFSI Data Report B, Rev. 1 39.4 59.9 72.8 89.6 94.5 33.9 43.1 45.6 48.1 57.2 106.6 130.3 131 156.1 167.4-167.8 185.0 185.3 188.5 197.0 215.8 to 216.0 223.1 230.7 236.3 289.9 to 290.1 na na na na na na na na na na na na na na na na na na na na na na na na na na na na na na na na 0.06 0.12 0.06 0.06 0.25 0.06 0.25 0.06 0.25 0.06 1.00 0.25 0.06 0.25 0.12 0.40 0.80 0.06 0.06 1.00 0.06 0.40 0.25 0.25 0.06 0.20 0.20 0.20 0.20 0.06 1.00 0.25 2.00 2.00 0.06 0.25 na na na na 3.0 to 7.5 7.5 to 11.0 0.5 to 5.4 -i to 2.3 0 to 8.5 4.5 to 11.0 0 to 8.5 8.5 to 22.0 0.00 to 4.00 6.0 to 19.0 1.0 to 4.5 11.8 to 17 0.06 0.12 0.06 0.06 0.25 0.06 0.25 0.80 0.50 0.12 2.00 0.50 0.12 0.25 0.25 0.40 0.80 0.06 0.06 1.00 0.06 0.40 0.50 0.50 0.12 0.80 0.60 0.60 0.80 0.25 4.00 2.00 4.00 4.00 0.25 0.25 1.2 1 3 6 3 1 1 1,2 1 1,2 1 5 4 5 4 4 5 5 5 7 4 4 4 Tofb 2 Tofb-.2 Tof 1 , 2 Toft, 2 Tofb.2 Tofb-1 Tofb, 1 Tofb-t Tofb 1 , Tofb.-I Tof 1.1 Tofb.I Toft, Tofb-1 Tofb.I Tofb.1 Tofb.I Tofb.I TofbI Tofb.I Tofb.I Tofb.I Tofb-l Tofb.I and Tofb.1a Tofb_, and Tofb-. Tofb.l and Tofb-,. Tofb.i and Tofb.la Tofb., and Tofb.l. Tofb-i and Tofb.ia Tofb., Tofb.I Tofb-.I Tofb.l Tofb.J TOfb.I I I B-43 of 244 Table B-5 Thickness Measurements of Clay Beds in Borings and Trenches (continued)
STATISTICS ON CLAY BED THICKNESS Measurements from boreholes and trenches number of thickness measurements
= minimum thickness
= maximum thickness
= median thickness
= mean thickness
= I standard deviation
=minimum 72 0.06 8.40 0.09 0.35 1.03 maximum 72 measurements 0.06 inches 8.40 inches 0.23 inches 0.59 inches 1.25 inches Trench Data Cumulative length of clay beds exposed in trenches (feet) (minimum because clay beds extend beyond end of trench) < 1/4 inch thick= 64.64 feet (28%)> 1/4 inch thick Total Boring Data Number of clay beds encountered in borings_< 1/4 inch thick > 1/4 inch thick Total= 169.96 feet (72%) 234.60 feet (100%) = 44 (73%) = 16 (27%) 60 (100%)Footnotes:
a measurements taken from trench exposures and borings; thicknesses may not represent the true ranges for individual beds b Tofb., =dolomite subunit, Tofb.ia = friable dolomite subunit, Tofb.2 = sandstone subunit C Notes on thickness
- 1. Only a single measurement taken; this value used in both minimum and maximum columns 2. Field description of film as "very thin"; assumed thickness of 0.06 (1/16) inch 3. Field description of "thin" given range of 0.06 to 0.12 inches 4. Thickness range recorded in trenches reflects two discrete measurements made along clay bed. 5. Thickness range is estimated from notes on trench logs 6. Thickness estimates using televiewer information only (boring log not used). 7. Thickness measured from photographs.
Diablo Canyon ISFSI Data Report B, Rev. I B-44 of 244 N 6M,000 EXPLANATION Footprint of 500 kV tower J Outline of ISFSI Pads 01C + Boring for ISFSI, number indicated (initial is year drlled) -/ Cutslope above and fill prism west of ISFSI pads W .Iq0 F 9 Cortur k .5 fe1 N 6M.500 R. I DIABLO CANYON ISFSI FIGURE B-1 BORING LOCATION MAP, ISFSI STUDY AREA (Roll 98 PED-1)View to the northeast during drilling of boring 98BA-1. PVC casing is shown being installed through HW drill steel by the PG&E drillers using a mobile B-40 drill rig.DiaDlo Canyon ISFSI Data Report B, Rev. 1 B-46 of 244 DIABLO CANYON ISFSI FIGURE B-2 VIEW TO THE NORTHEAST OF DRILLING AT BORING 98BA-1 (mil b I-'-U-1)View to the northwest during drilling at boring 98BA-1 and 98BA-4. Borehole suspension logging is shown being performed in 98BA-1 by GeoVision.
Diablo Canyon ISFSI Data Report B, Rev. 1 B-47 of 244 DIABLO CANYON ISFSI FIGURE B-3 VIEWTOTHE NORTHWEST TOWARD DRILLING AT BORINGS 98BA-1, 98BA-4 S -,(Roll 98 PED-1)View to the north during drilling of boring 98BA-2 with the western Raw Water Reservoir in the background.
Diablo Canyon lSFSI Data Report B, Rev. 1 B-48 of 244 P DIABLO CANYON ISFSI FIGURE B-4 VIEW TO THE NORTH TOWARD DRILLING AT BORING 98BA-2 (Roll 98 PED-1)Close up view during drilling of boring 98BA-3. Boring 98BA-3 was drilled approximately four feet east of boring 98BA-2.Diablo Canyon ISFSI Data Report B, Rev. 1 B-49 of 24z DIABLO CANYON ISFSI FIGURE B-5 CLOSEUP VIEW OF DRILLING AT BORINGS 98BA-2, 98BA-3
--A--Boring truck photo.tif View to the east of drilling at boring OOBA-1.DIABLO CANYON ISFSI FIGURE B-6 VIEW TO THE EAST OF DRILLING AT BORING 00BA-1 D)iablo Canyon I1-F,1 Data Report B, Rev. 1 B-50 of 244 (Roll 00 JGH-3)View south of drilling at boring OOBA-2.Diablo Canyon ISFSI Data Report B, Rev. 1 B-51 of 244 DIABLO CANYON ISFSI FIGURE B-7 DRILL RIG DRILLING AT OOBA-2
- 'S (Roll 00 JGH-3)Southeast view during drilling of boring OOBA-3.Diablo Canyon ISFSI Data Report B, Rev. 1 B-52 of 244 DIABLO CANYON ISFSI FIGURE B-8 VIEW OF DRILLING AT BORING OOBA-3*<7 (Roll 01 P4180024.JPG)
View to southwest during drilling of boring 01 -CTF-A.Diablo Canyon ISFSI Data Report B, Rev. 1 B-53 of 244 DIABLO CANYON ISFSI FIGURE B-9 DRILLING AT BORING 01CTF-A View to northwest of Borings 01-F and 01-C during drilling, and locations of Boring 01-A.15-Z4 Ol /-44 DIABLO CANYON ISFSI FIGURE B-10 DRILLING AT BORINGS 01-C AND 01-F f'li~hln (fl..nvnn IRFRI IlQtQ R::lnnrt P R~ 1 I ",, Diablo Can-n lSFS1 Data Re ort B Rev1
) V /(Roll 01 P4210060.JPG)
View to the northwest of drilling at Boring 01-B.Diablo Canyon ISFSI Data Report B, Rev. 1 B-55 of 244 DIABLO CANYON ISFSI FIGURE B-11 DRILLING AT BORING 01-B (Roll 01 JLB-2)View to the west during drilling of Boring O1-D Diablo Canyon ISFSI Data Report B, Rev. 1 B-56 of 244 DIABLO CANYON ISFSI FIGURE B-12 DRILLING AT BORING 01-D
.'- (Roll 01 KDW-3)View to the north during drilling of Boring 01-E uiablo Canyon ISFSI Data Report B, Rev. 1 B-57 of 244 DIABLO CANYON ISFSI FIGURE B-13 DRILLING AT BORING 01-E I-fOil U I JLb-Z)View to the west during drilling of Borings O1-G and O1-D.Diablo Canyon ISFSI Data Report B, Rev. 1 B-58 of 244 DIABLO CANYON ISFSI FIGURE B-14 DRILLING AT BORINGS 01-G AND 01-D (Roll 01 KDW-1)View to the east during drilling of Boring 01-H.uialOo Canyon ISFSI Data Report B, Rev. 1 B-59 of 244 DIABLO CANYON ISFSI FIGURE B-15 DRILLING AT BORING 01-H (Roll 01 JGH-6)View to the south during drilling of boring 01-I.DIABLO CANYON ISFSI FIGURE B-16 DRILLING AT BORING 01-1 Diablo Canyon ISFS1 Data Report B, Rev. I B3-60 of 244