vc summer units 2 and 3 · 2012. 12. 4. · unit 2 temporary retaining wall unit 2 temporary...
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VC Summer Units 2 and 3Excavation Sequence
Geologic Mapping Technical Approach
Data Management
Nathan B. Cooke, PG, Senior Site Geologist-Shaw Nuclear
Matthew F. Cooke, PG, Senior Site Geologist-Shaw Nuclear
Gina Ferrugia, Site Geologist - Shaw Nuclear
April 18th, 2011
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EXCAVATION SEQUENCE SUMMARY
Mass Grading from Elevation 420 to 400
Temporary Retaining Wall Installation and Excavation to Top of Rock
Rock Excavation (controlled blasting) to Final Foundation Grade in NI
and CWS Area
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Clearing Grubbing and Mass Grading from ~Elevation 420 to
~Elevation 400
– Pan Scrapers (CAT 637), Dozers, Excavators used to remove
overburden soils (Residual Soil and Saprolite)
– Geologic Mapping Performed Before and During This Phase
• Reconnaissance Mapping
• Geologic Trenches and Test Pits
EXCAVATION SEQUENCE-MASS GRADING
April 18, 2011
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Initial Grubbing – Unit 2
August 2009
Approximate Elevation 370 to 430
EXCAVATION SEQUENCE-MASS GRADING
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Photograph showing Unit 2 Area mass grading operations. Area is at approximate final
rough grade Elevation 400. Note pan scrape in cut area exposing features in Saprolite.
Final Grading – Unit 2
February 2010
EXCAVATION SEQUENCE-MASS GRADING
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EXCAVATION SEQUENCE
UNIT 2 TEMPORARY RETAINING WALL
Unit 2 Temporary Retaining Wall
1. Installation of Soldier Piles
2. Excavation performed along wall in approximate 5 to 6 foot lifts.
Simultaneous excavation by SHAW in central portion of Power Block
3. Installation of Timber Lagging
4. Drilling/Installation of Tie Backs
5. Geologic Mapping Performed During This Phase
• Retaining Wall Mapping
• Reconnaissance Mapping of Interior Excavation
• Top of Rock Mapping
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Unit 2 Power Block Excavation Plan View
EXCAVATION SEQUENCE
UNIT 2 TEMPORARY RETAINING WALL
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EXCAVATION SEQUENCE
ROCK EXCAVATION UNIT 2 NUCLEAR ISLAND
Unit 2 Nuclear Island Rock Excavation
1. Development of Rock Excavation Plan and Sequence
2. Drilling and Controlled Blasting (Palmetto Rock)
3. Excavation of Blasted Rock (Shaw)
4. Rock Cleaning and Vacuuming (Shaw)
5. Final Foundation Grade Geologic Mapping (WLA)
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EXCAVATION SEQUENCE
ROCK EXCAVATION UNIT 2 NUCLEAR ISLAND
ROCK EXCAVATION PLAN
Review of FSAR Geotechnical Data
Review of As-Built Top of Rock
contours in NI.
GOAL: Excavate to EL 357 or to
Sound Rock, whichever is deeper
Benched Excavation Plan based on
estimated Sound Rock contours from
COLA Subsurface Investigation Data.
General Drilling and Blasting
Sequence:1. Pre-Splitting 357 Bench Outside
Perimeter
2. Removal of Rock from ~EL 379 to
357
3. Pre-Splitting Outside Perimeter
and interior benches from EL 357
to EL 342.
4. Removal of Rock from EL 357 to
EL 342.
5. Removal of Rock from EL 342 to
334.
6. Rock Excavation for Temporary
Dewatering Sump outside of NI to
EL 327.
SUMP
EL. 327
EL. 334-342
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Unit 2 Nuclear Island Intermediate Rock Excavation. View from Plant South Wall
EXCAVATION SEQUENCE
ROCK EXCAVATION UNIT 2 NUCLEAR ISLAND
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Unit 2 Nuclear Island Excavation Final Grade. View from Plant South Wall
EXCAVATION SEQUENCE
ROCK EXCAVATION UNIT 2 NUCLEAR ISLAND
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GEOLOGIC MAPPING
TECHNICAL APPROACH
1. “Target of Opportunity” Reconnaissance Mapping - Ongoing
2. Unit 2 and 3 Geologic Trenches and Test Pits - Complete
3. Unit 2 Power Block Retaining Wall Mapping - Complete
4. Unit 2 Nuclear Island and CWS Area Top of Rock Mapping - Complete
5. Unit 2 Nuclear Island Final Foundation Mapping - In Progress
6. Unit 3 Power Block Retaining Wall Mapping - In Progress
7. Map Key Features in Unit 2 CWS Excavation - Later
8. Map Key Features in Balance of Power Block Excavation - Later
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GEOLOGIC MAPPING
TECHNICAL APPROACH:
RECONNAISSANCE MAPPING
Collected Geologic Data from Exposures in Excavations Since Beginning of Site Grading
(Late 2008)
Types of Exposures:
– Pan Scrapes
– Shear Wall Excavations
– Utility Trenches
– Rail and Road Cuts
– Sedimentation Pond Excavations
– Erosional Features
– Natural Outcrops
– Test Pits
Data Collected:
– Digital Photographs (6,000+ Photos)
– Geologic Field Notes/Sketches (10,000+ Observations)
– Compass Measurements (~400 Measurements of Structural Features)
– Samples Collected (Over 250 Specimens)
Review of Background Information
– Unit 1 Geologic Investigation
– Unit 2 and 3 COLA Subsurface Exploration
– Geologic Literature
– Aerial Photographs and Light Detection and Ranging (LIDAR) Data
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Pan Scrapes
GEOLOGIC MAPPING
TECHNICAL APPROACH: SITE-WIDE
RECONNAISSANCE MAPPING
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Ditch Excavations Sediment Pond Excavations
Road and Railroad Cuts Utility Trench Excavations
GEOLOGIC MAPPING
TECHNICAL APPROACH: SITE-WIDE
RECONNAISSANCE MAPPING
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Shear Wall Excavations
Erosional Exposures
GEOLOGIC MAPPING
TECHNICAL APPROACH: SITE-WIDE
RECONNAISSANCE MAPPING
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Dots represent locations
of reconnaissance
mapping data collection
transposed on a Lidar
topographic relief map.
Geologic
Reconnaissance
Mapping
Waypoints
GEOLOGIC MAPPING
TECHNICAL APPROACH: SITE-WIDE
RECONNAISSANCE MAPPING
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GEOLOGIC MAPPING
TECHNICAL APPROACH:
Unit 2 and Unit 3 Geologic Trenches
Geologic Trenches, typically 4 to 5 feet deep were excavated across the
Unit 2 and Unit 3 Power Block Areas during grading from approximately
elevation 420 to 400.
– Documentation of near surface conditions in Power Block vicinity
– Develop mapping techniques for subsequent Power Block Retaining
Wall mapping
– Trenches were divided into approximate 10’ wide panels, surveyed,
photographed and mapped.
– Encountered fill, undifferentiated surficial deposits, residual soil,
saprolite and localized zones of partially weathered rock.
– Geologic Trench Report by WLA Complete
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GEOLOGIC MAPPING
TECHNICAL APPROACH:
Unit 2 and Unit 3 Geologic Trenches
Geologic
Trench Location
Map
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Unit 2 Trench Oriented East-West
GEOLOGIC MAPPING
TECHNICAL APPROACH:
Unit 2 and Unit 3 Geologic Trenches
Panels on the North Wall Unit 2
Trench
String/Tape Locations Indicated by Dark Lines
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Unit 2 Trench South Wall Example
Photograph
GEOLOGIC MAPPING
TECHNICAL APPROACH: Unit 2 and Unit 3 Geologic Trenches
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Unit 2 Trench Example Final Geologic Map
GEOLOGIC MAPPING
TECHNICAL APPROACH:
Unit 2 and Unit 3 Geologic Trenches
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GEOLOGIC MAPPING TECHNICAL APPROACH –
UNIT 2 Power Block Retaining Wall
and Top of Rock Mapping
Wall Mapping During Excavation and Construction of Unit 2 Retaining Wall
Top of Rock Mapping (Pre- and Post-Blasting)
WLA Procedures, Project Planning Document (QA Plan), Project Instructions, Work
Instructions:
1. Project Planning Document (PPD)
2. Geologic Map Data Collection Plan (Project Instruction)
3. Laboratory Testing Plan (Project Instruction)
4. Geoscience Evaluation and Analysis Plan (Project Instruction)
5. Field Records (Work Instruction)
6. Survey Control (Work Instruction)
7. Field Mapping Standards (Work Instruction)
8. Sampling Protocol Handling and Storage (Work Instruction)
9. Data Compilation and Verification (Work Instruction)
10. Units 2 and 3 Wall Photography and Mapping (Work Instruction)
11. GPS Unit Accuracy Verification (Work Instruction)
12. Unit 2 Nuclear Island and CWS Area Preliminary Geologic Mapping (Work Instruction)
13. Unit 2 Nuclear Island and CWS Area Final Foundation Mapping (Work Instruction)
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Geologic mapping in progress along north wall in Unit 2 Power Block.
GEOLOGIC MAPPING TECHNICAL APPROACH –
UNIT 2 Power Block Retaining Wall
and Top of Rock Mapping
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Example Retaining Wall Panel Before Mapping
GEOLOGIC MAPPING TECHNICAL APPROACH –
UNIT 2 Power Block Retaining Wall
and Top of Rock Mapping
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Example Retaining Wall Panel After Mapping
GEOLOGIC MAPPING TECHNICAL APPROACH –
UNIT 2 Power Block Retaining Wall
and Top of Rock Mapping
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Example Retaining Wall Geologic Map
GEOLOGIC MAPPING TECHNICAL APPROACH –
UNIT 2 Power Block Retaining Wall
and Top of Rock Mapping
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Example Top of Rock Before Mapping
GEOLOGIC MAPPING TECHNICAL APPROACH –
UNIT 2 Power Block Retaining Wall
and Top of Rock Mapping
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Example Top of Rock After Mapping
GEOLOGIC MAPPING TECHNICAL APPROACH –
UNIT 2 Power Block Retaining Wall and Top of
Rock Mapping
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Example Portion of Unit 2 Nuclear Island Top of Rock Geologic Map
GEOLOGIC MAPPING TECHNICAL APPROACH –
UNIT 2 Power Block Retaining Wall
and Top of Rock Mapping
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Example Final Foundation Sound Rock Before Mapping
GEOLOGIC MAPPING TECHNICAL APPROACH –
UNIT 2 Nuclear Island
Final Foundation Geologic Mapping
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Example Final Foundation Sound Rock After Mapping
GEOLOGIC MAPPING TECHNICAL APPROACH –
UNIT 2 Nuclear Island
Final Foundation Geologic Mapping
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DATA MANAGEMENT
FIELD RECORDS
– Field Books and Notes
– Base Maps
– Annotated Data (Base Photos and Maps)
– Digital Data
Geologic Mapping Data Collection Plan, Field Records Work Instruction
On-site Storage Facility (WLA Trailer) Fire Proof File Cabinet
Field Books and Notes Scanned Each Day
Data Transmitted to Home Office Each Day for GIS
Scanned Field Books, Notes, Digital Data backed also backed up each day
on external hard drive.
Data Also Provided to Shaw Daily
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Site Lithologic Units(in approximate order of increasing age)
SURFICIAL UNITS
Man-made Fill
Alluvium
Colluvium
Undifferentiated Surficial Deposits
Residual Soil
Saprolite
ROCK UNITS
Winnsboro Plutonic Complex
Aplite
Pegmatite
Quartz Monzonite
Diorite
Charlotte Terrane
Quartz Veins
Migmatite
Amphibolite Schist and Gneiss
SUMMARY OF LITHOLOGIC AND ENGINEERING
UNITS
FSAR Engineering Layers
LAYER I (ML and MH)
LAYER II (ML and SM)
LAYER III (PWR, SPT N > 100bpf,
Transition Zone)
LAYER IV (MWR, RQD 0% to 50%)
LAYER V (Sound Rock, RQD 50% to 100%,
Typically > 70%)
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CLOSING
QUESTIONS