ML25345A137
| ML25345A137 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 12/11/2025 |
| From: | Holtec Decommissioning International, Radiation Safety & Control Services |
| To: | Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML25345A092 | List:
|
| References | |
| HDI 25-039 24-111, Rev 0 | |
| Download: ML25345A137 (0) | |
Text
Surface/Sub Surface Characterization Survey Plan for Oyster Creek Nuclear Generating Station Technical Support Document No.24-111 Revision 00 Prepared by:______________________________________________________
William Parish, Sr. Radiological Engineer Reviewed by: ______________________________________________________
Ken Lindsey, Sr. Radiological Engineer Reviewed by: ______________________________________________________
Matthew E. Darois, CGWP, Director of Environmental & Engineering Reviewed by: ______________________________________________________
Nate Russell, RSCS Project Engineer Approved by: ______________________________________________________
Chris Messier, Sr. Director of Engineering and Strategic Development Radiation Safety & Control Services, Inc 93 Ledge Road, Seabrook, NH 03874 1-800-525-8339 (603) 778-2871 (Outside USA) www.radsafety.com 12/21/2024 RSCS Radiation Safety & Control Services phone: 1-800-525-8339
- fax: 603-778-6879 i nfo@rad safety. com www.radsafety.com
RSCS TSD 24-111 Page 2 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station Table of Contents 1
INTRODUCTION................................................................................................................................. 4 2
SCOPE OF WORK............................................................................................................................... 4 3
PREREQUISITES................................................................................................................................. 5 4
PRECAUTIONS AND LIMITATIONS............................................................................................... 6 5
QC REQUIREMENTS......................................................................................................................... 6 6
TYPES OF MEASUREMENTS........................................................................................................... 7 7
SURVEY AREA PREPARATIONS.................................................................................................... 8 8
HEALTH AND SAFETY REQUIREMENTS..................................................................................... 8 9
FIELD GUIDANCE FOR SAMPLE COLLECTION.......................................................................... 9 9.1 Sample Designations................................................................................................................... 9 9.2 Applicable Field Procedures........................................................................................................ 9 9.3 Field Instruments and Equipment.............................................................................................. 10 9.4 General direct-push Instructions................................................................................................ 10 10 DATA ASSESSMENT....................................................................................................................... 11 10.1 Verify that onsite and contract commercial laboratory met the required MDC for their specific analysis...................................................................................................................................... 11 10.2 Evaluate the observed depth of contamination on any investigative samples........................... 11 10.3 Evaluate sample results at or near the RCA boundary to determine:........................................ 11 10.4 Compare onsite and contract commercial laboratory gamma spectroscopy results.................. 11 10.5 Evaluate the contract commercial laboratory gamma spectroscopy and HTD analysis results.
The evaluation should identify:................................................................................................. 11 11 REFERENCES.................................................................................................................................... 11 11.1 RSCS SOP 3.10.6 Rev 01, Subsurface Soil Sampling Using Direct Push Methods................. 11 11.2 Oyster Creek Station Site Characterization Plan, May 2022..................................................... 11 11.3 NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM),
Revision 1, August 2000............................................................................................................ 11 11.4 NUREG-1757, Consolidated Decommissioning Guidance: Characterization, Survey, and Determination of Radiological Criteria Consolidated Decommissioning Guidance:
Characterization, Survey, and Determination of Radiological Criteria - Final Report, Volume 2, Revision 2, August 2022........................................................................................................ 11 11.5 Oyster Creek Generating Station Site Radiological Characterization Report, Rev. 1, April 24, 2023........................................................................................................................................... 11 12 ATTACHMENTS............................................................................................................................... 11 12.1 - Geoprobe Sample / Survey Form..................................................................... 11
RSCS TSD 24-111 Page 3 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station 12.2 - Sampling target area maps............................................................................... 11 Tables Table 1 Targeted Geoprobe Sample Locations............................................................................................... 5 Table 2 Required MDCs for Laboratory Analysis.......................................................................................... 5
RSCS TSD 24-111 Page 4 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station 1 INTRODUCTION Oyster Creek Nuclear Generating Station (OCNGS) is currently being decommissioned. The investigation of surface and subsurface soils will further define the extent of the site's existing radiological status at various times during decommissioning. Direct-pushed soil core sampling utilizing GeoprobeTM technology will be used to collect subsurface soil or sediment samples at depths that may not be readily assayed using surface scanning techniques.
This survey area plan is designed in accordance with the Oyster Creek Station Site Characterization Plan [11.2] and incorporates guidance found in NUREG-1575 [11.3] and subsurface characterization methodologies discussed in NUREG-1757 Rev 2 (Volume 2) [11.4]
Primary Target ROC(s): Cs-137 and Co-60 as developed in the DQOs in the Oyster Creek Station Site Characterization Plan.
2 SCOPE OF WORK This survey plan provides instructions for acquiring samples and recording data for subsurface radiological characterization surveys at OCNGS. Survey rigors for the area depend on the preliminary MARSSIM classification of the areas being surveyed.
The contracted direct push stainless steel sampling probe (GeoprobeTM) vendor can provide 1.25-inch diameter core samples in approximately 4-foot increments to a depth of up to approximately 12-16 feet or until ground refusal is met. The 12-16-foot depth should be adequate to reach the saturated subsurface soil layer. A sample will be collected at the surface of each selected location and to a depth of approximately 6 inches or 15 cm. The surface sample may include concrete, asphalt and soils depending on the location.
The next 6 inches or 15 cm is considered subsurface. The subsequent direct-push sample cores will be divided into regions of nominally 0 to 4 feet, 4 to 8 feet, 8 to 12 feet, and 12 to 16 feet. The 1.25-inch diameter, 4-foot core samples should result in a volume of approximately 1.0 liter of material (r2h). So, sufficient material is available to collect a 1-liter sample at 4-foot depth increments. If more discrete sampling is needed, additional soil cores in proximity to each other can be collected for sufficient sample volume. For example, if 2ft incremental sampling is desired, two complete soil borings will be required to collect 1-liter samples from each 2 ft increment.
A graded approach to the characterization surveys may be utilized, however, in this initial sampling scope, each sample will undergo onsite gamma spectroscopy analysis. Offsite analysis by the contracted commercial laboratory includes gamma spectroscopy and the full suite of hard-to-detect (HTD) nuclides via radiochemical separation, beta scintillation, and alpha spectroscopy, as required to achieve the desired minimum detectible concentration (MDC) (see Table 2) for the suite of radionuclides of concern (ROCs).
The MDCs in Table 2 are based on 10% of the soil acceptance criteria Table 1-3 (i.e. 1.5 mrem/yr) in the Oyster Creek Generating Station Site Radiological Characterization Report [11.5].
The objectives for the more stringent data analysis in the initial set of GeoprobeTM samples are outlined below:
Supplement existing surface sample data in the RCA where HTD nuclides are most likely present.
Determine the contamination from known spills or contamination identified in the Historical Site Assessment (HSA) and initial characterization surveys. The Table 1 sample locations are targeted rather than random. Targeted locations do not need to be exactly matched since previous samples may have removed shallow contamination. The targeted locations should be a starting point for the investigative samples collected (i.e. within a 1-meter radius).
Confirm consistency of onsite and contracted commercial laboratory analysis for gamma spectroscopy, specifically for the quantification of Co-60 and Cs-137 as the primary Target ROCs.
RSCS TSD 24-111 Page 5 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station Demonstrate that onsite gamma spectroscopy is an effective screening tool for suspicion of HTD nuclides. If not, then increasing the fraction of samples requiring HTD analysis may be warranted in future similar survey plans.
Table 1 Targeted Geoprobe Sample Locations OCNGS Targeted Sample Locations Area / Component Easting Northing Condensate Storage Tank 574483.7340 357378.2728 Surge Tank (north of ORW) 574902.1352 357585.7445 TWST in NPA 574289.4039 357827.7436 Old Radwaste Loading Dock 575041.3606 357536.2351 Historical buried spoils piles Various1 Various1 1Multiple sample locations are located in NOCA2 and are provided in the maps included in Attachment 2 of this survey plan.
Table 2 Required MDCs for Laboratory Analysis ROC MDC1 (pCi/g)
ROC MDC1 (pCi/g)
ROC MDC1 (pCi/g)
Am-241 1.57E+00 Eu-154 5.44E-01 Pu-238 1.31E+00 C-14 1.70E-01 Fe-55 3.10E+03 Pu-239 1.69E+00 Cm-243 5.25E+00 H-3 3.03E+01 Pu-240 1.69E+00 Cm-244 2.93E+00 Mn-54 1.03E+00 Pu-241 5.30E+01 Co-60 2.44E-01 Nb-94 4.16E-01 Sb-125 1.83E+00 Cs-137 5.76E-01 Ni-63 4.35E+01 Sr-90 1.06E-01 Eu-152 5.88E-01 Np-237 6.58E-02 Tc-99 9.42E-01 1 Critical level (Lc) is expected to be approximately 50% of the required MDCs.
3 PREREQUISITES Walkdowns of the sample locations will be required prior to sampling to identify safety issues, obstructions or barriers to completion of work. Special consideration for location access, overhead obstructions/utilities, equipment grounding requirements, conflicts with other planned work and industrial safety concerns such as high noise during sampling should be considered.
Site Excavation Permits shall be completed for each planned sample location. Ensure that permits clear a specified area centered on each location rather than a single point, this will allow for adjustment and multiple borings if required.
All sample locations shall be marked out with white marking paint and/or a pin flag indicating the sample location ID.
Perform any utility mark out requirements specified on the excavation permits.
Execute the New Jersey One Call 1-800-272-1000 or 811 at least 3 business days prior, and less than 10 days before soil sampling activities deeper than 6-inches. One call shall be notified by the GeoprobeTM vendor who will provide scale location maps depicting all sample locations if requested. One call is suitable for 45 days following notification.
Perform a Job Safety Analysis or equivalent prior to commencing work. All field staff should be
RSCS TSD 24-111 Page 6 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station briefed daily on safety hazards specific to the work scope(s).
Ensure that there is qualified, licensed oversight of the direct push operations in accordance with N.J.A.C 7:9D, WELL CONSTRUCTION AND MAINTENANCE; SEALING OF ABANDONED WELLS, subchapter 7:9D-2.6 (Cat 5 geotechnical borings), April 2007.
Verify that all authorizations to proceed with work, including excavation permits, are in place prior to commencing soils sampling.
Confirm that the onsite analysis laboratory is aware of the schedule for sampling and the packaging of samples provided by the contractor and the required MDCs (pCi/g) in Table 2.
Confirm that any specific timetable or sample preservation requirements of the contracted commercial laboratory are known to the personnel collecting the sample and onsite laboratory personnel.
Confirm that sample collection personnel are following the required sample custody, packaging, handling, storage and shipping instructions.
4 PRECAUTIONS AND LIMITATIONS Samples should be collected to prevent cross-contamination. Sample removal tools should be wiped down after each use at each depth. Sample containers should be removed from the area to prevent contamination from probe operation during the digging cycle. Equipment should be wiped down to prevent the spread of contamination between sampling locations.
It is likely that hardscape removal and surface samples may be collected several days or weeks prior to the subsurface sampling. If this occurs, the sample area where the hardscape is removed should be protected from cross-contamination or water intrusion that may alter or distort the subsurface sample location.
If the water table is penetrated or suspected of being penetrated with subsequent GeoprobeTM pushes, halt deeper sampling and annotate the datasheet.
The onsite laboratory may provide or specify the sample collection containers to be provided to the laboratory. Repackaging the sample away from the collection site or by the onsite laboratory into the counting geometry is typically preferred to minimize external contamination. These details should be determined before sampling commences.
If the contracted commercial laboratory requests specific separation of some materials and/or additives, the onsite laboratory should identify the quantity of additional sample for that purpose.
OCGNS will determine if underground utilities/commodities exist in the sample areas. Alternate sampling methodologies (e.g. soft dig, etc.) may be necessary.
5 QC REQUIREMENTS Sample Control:
For onsite and offsite gamma spectroscopy analysis, it is assumed that no drying or processing of the collected sample is performed to ensure consistent results. The contracted commercial laboratory may process the sample after gamma spectroscopy analysis to carry out any necessary steps for the HTD analysis.
The onsite analysis will be conducted using a 1L Marinelli beaker geometry. Once the samples have
RSCS TSD 24-111 Page 7 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station been analyzed by the onsite laboratory, they should not be repackaged or reconfigured unless the original packaging is damaged. For transport to the contracted commercial laboratory, the Marinelli beaker may be sealed with tape.
The integrity of samples sent to the contracted laboratory will be maintained using a Chain of Custody (CoC) procedure, which will be documented through a completed CoC form.
The commercial laboratory must return any unused sample portion to the site for archival purposes.
Radiation Detection Instruments:
Radiation detection instruments shall have a current calibration with the calibration date affixed to the detector and instrument. Calibrations must utilize National Institute of Standards and Technology (NIST)-traceable radioactive sources. Calibration records will be available for review during the site characterization project.
Pre-and post-use operability checks for field instruments shall be performed and documented per approved procedures.
Contracted Commercial Laboratory:
The commercial laboratory supplying radiological analytical services shall have current NELAP certification.
Onsite Chemistry Trailer:
Laboratory radiation detection and counting systems used to collect characterization data shall be calibrated and operated in accordance with applicable procedures.
Daily operability and QC checks shall be performed and documented as required by the applicable procedure.
6 TYPES OF MEASUREMENTS NOTE: Two corebores will be obtained from each of the locations flagged. At-depth material will be composited from each corebore to obtain the required 1L Marinelli volume at the designated depth.
Samples are collected at the designated locations to represent surface hardscape and soils at depths of nominally 0-2ft, 2-4ft,4-6ft, 6-8ft, 8-10ft and 10 to 12ft.
Samples shall be identified by a unique identification number. Labeling of composite sample collection containers prior to deployment to the field has been helpful in previous sampling efforts.
The following sample identification protocol is suggested for consistency with previous characterization samples:
RCA-BBBB-##-X Where BBBB is the media code asph = asphalt conc = concrete sedi = sediment soil = soil layer 0-15 cm (~6 inches)
RSCS TSD 24-111 Page 8 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station dep1 = deep soil sample using GeoprobeTM up to 2 feet depth or until resistance is met, and annotate depth range on survey (e.g. 0-2 ft) dep2 = deep soil sample using GeoprobeTM 2 feet to 4 feet depth or until resistance is met, and annotate depth range on survey (e.g. 2-4ft) dep3 = deep soil sample using GeoprobeTM 4 feet to 6 feet depth or until resistance is met, and annotate depth range on survey (e.g. 4-6 ft) dep4 = deep soil sample using GeoprobeTM 6 feet to 8 feet depth or until resistance is met, and annotate depth range on survey (e.g. 6-8 ft) dep5 = deep soil sample using GeoprobeTM 8 feet to 10 feet depth or until resistance is met, and annotate depth range on survey (e.g. 8-10 ft) dep6 = deep soil sample using GeoprobeTM 10 feet to 12 feet depth or until resistance is met, and annotate depth range on survey (e.g. 10-12 ft) watr = water
- = Sample Number X = Sample designators Blank = If no X value is listed then the sample was generated using Visual Sample Plan B = Bias sample - assign the next sequential sample number and add the -B designator I = Investigative sample - assign the next sequential sample number and add the
-I designator The D and QC designators identified in other Survey Plans are not used for this survey plan since both the onsite laboratory and contracted commercial laboratory will be analyzing each sample and there may be insufficient sample volume to obtain duplicate samples at various depths.
Samples are collected and packaged for onsite laboratory analysis by gamma spectroscopy, followed by contracted commercial laboratory analysis by gamma spectroscopy and HTD analysis.
7 SURVEY AREA PREPARATIONS Area Preparations Yes No N/A Walkdown performed Area is accessible for survey Area Preparations confirmed in place and acceptable Location(s) requires additional equipment for hardscape removal.
If additional preparations are warranted, contact:
Targeted sample locations should be identified with stakes, flags, or white surface markings as a visual aid to the field teams, engineering, safety and others evaluating underground interferences or hazards.
8 HEALTH AND SAFETY REQUIREMENTS Permits and Evaluations Yes No Permit Number or Contact Information I
RSCS TSD 24-111 Page 9 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station JHA required RWP required Excavation / Dig Permit Soft Dig Restriction If yes, depth:
ft Other (Specify)
If yes, maintain a copy as a record for this survey Area safety hazards:
- Trip hazards due to uneven surfaces
- Potential confined spaces
- Overhead equipment and utilities PPE requirements: safety shoes, safety glasses, gloves, reflective safety vest, hard hat, hearing protection Field communication requirements: Two-way radio/cell phones Emergency contacts: Security x4911 or 609-971-4911 Injury/Unexpected conditions:
Sampling issues contact:
Stop-work criteria:
- Unexpected radiation levels
- Unexpected safety hazard
- Personnel injury
- Unexpected inclement weather 9 FIELD GUIDANCE FOR SAMPLE COLLECTION Note: This survey plan addresses the collection of surface and direct-push subsurface samples.
9.1 Sample Designations It is expected that each direct-push sample location will consist of a surface sample (concrete, asphalt, or soils depending on the location),, and deep samples at approximately 2 ft intervals to an approximate maximum depth of 12ft. If it is suspected that the next 2 ft sample interval will enter the water table, discontinue sample advancement and annotate the sample sheet for that location with the total depth achieved. Use the sample numbering system outlined in Section 6 to identify individual samples. Direct push samples will be recovered in plastic 1.25 inch wide by 48-inch-long tubes. The recovered sample tubes will be cut open, and each 2-foot soil volume (one from each tube) will be homogenized in a mixing bowl and packaged into designated 1-liter Marinelli containers.
The sample form is setup for direct-push samples at an estimated four locations per day. The form may be edited to include additional samples collected on the same day. If the sequence involves multiple day iterations initiate a separate sample sheet for each day. Sample time is not requested because the majority of the radionuclides are of sufficient half-life that it is irrelevant. Use 1200 if necessary for other analysis programs requiring an entry.
9.2 Applicable Field Procedures I
I
RSCS TSD 24-111 Page 10 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station Procedure Number Procedure Title ENG-OP-001 Radiological Survey Performance ENG-OP-002 Volumetric and Material Sampling ENG-OP-003 Chain of Custody for Transferring Samples ENG-OP-025 Sealed Radioactive Source Control ENG-OP-034 Operation of the Leica FLX100 GPS RSCS SOP 3.10.6 Subsurface Sampling Using Direct Push Methods 9.3 Field Instruments and Equipment Asphalt removal tools, hand shovel/spade, Direct-push sampling equipment, Radiological survey instruments, including frisker to support contamination control and surface scans, as needed, Cleaning and/or decontamination materials to control cross contamination during sampling sequences, Sample location marking tools, flags, tape, paint, etc.,
GPS system for sample location stakeout or actual sample location recording, Sample bags, waste bags, markers, tape, etc.
Barrier tape and hole cover, as required Spill kit 9.4 General direct-push Instructions Soil samples are collected with a trowel, hand auger, or direct push stainless steel sampling probe (GeoprobeTM) in accordance with RSCS SOP 3.10.6 Rev 01: Subsurface Sampling Using Direct Push Methods (Attachment 2) [11.1].
The Geoprobe uses a hydraulically powered hammer to advance a 2-inch diameter 4 feet long dual-tube steel sampling probe containing a plastic liner into the soil.
After advancing the sampling probe, the 4 feet long plastic liner is withdrawn and cut open to expose the sampled soil.
After donning a fresh pair of nitrile surgical gloves, a representative aliquot of soil is collected from the plastic liner and placed in sample containers provided by the analyzing laboratory.
An additional 4-foot length of the dual-tube sampling probe is then threaded onto the top of the section of the probe in the ground.
A new plastic liner is then inserted to the bottom of the sampling probe and a four-foot-long steel extension rod is then threaded to the top of the liner.
This assembly is then advanced an additional 4 feet to collect a deeper soil sample.
Repeat the 9.4 sequence above, as needed, to achieve the desired depth. If the water table is penetrated or suspected of being penetrated with subsequent sample advancement, halt deeper sampling and annotate the data sheet.
Once satisfied that the direct-push sampling at that location is complete, the sample boring
RSCS TSD 24-111 Page 11 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station contractor shall seal the boring in accordance with accepted state/local protocols to prevent the inadvertent intrusion of contamination to groundwater. In the state of NJ each boring is required to be filled with bentonite clay chips and hydrated with potable water.
10 DATA ASSESSMENT 10.1 Verify that onsite and contract commercial laboratory met the required MDC for their specific analysis.
10.2 Evaluate the observed depth of contamination on any investigative samples.
10.3 Evaluate sample results at or near the RCA boundary to determine:
10.3.1 If results exceed the DCGL, expansion of the RCA boundary may be warranted, or 10.3.2 If results are sufficiently below the DCGL, the classification of the RCA as Class 1 sufficiently bounds area and the classification of adjacent areas is consistent with those presented in the Characterization Report.
10.4 Compare onsite and contract commercial laboratory gamma spectroscopy results.
10.4.1 The assessment should determine whether the identified nuclides, specifically Co-60 and Cs-137 are consistent between the laboratories and whether the onsite laboratory can adequately assess the gamma components to support real time field decisions.
10.5 Evaluate the contract commercial laboratory gamma spectroscopy and HTD analysis results. The evaluation should identify:
10.5.1 Correlations between Co-60 as an indicator of activation products, Cs-137 as an indicator of other fission products, 10.5.2 Cs-137 / Sr-90 ratio consistency or inconsistencies, 10.5.3 Whether the HTD nuclide Pu-241 is a reliable indicator of alpha-emitting ROCs.
11 REFERENCES 11.1 RSCS SOP 3.10.6 Rev 01, Subsurface Soil Sampling Using Direct Push Methods 11.2 Oyster Creek Station Site Characterization Plan, May 2022 11.3 NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM),
Revision 1, August 2000.
11.4 NUREG-1757, Consolidated Decommissioning Guidance: Characterization, Survey, and Determination of Radiological Criteria Consolidated Decommissioning Guidance:
Characterization, Survey, and Determination of Radiological Criteria - Final Report, Volume 2, Revision 2, August 2022.
11.5 Oyster Creek Generating Station Site Radiological Characterization Report, Rev. 1, April 24, 2023 12 ATTACHMENTS 12.1 Attachment 1 - Geoprobe Sample / Survey Form 12.2 Attachment 2 - Sampling target area maps
RSCS TSD 24-111 Page 12 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station Sample / Survey Form Example Date:
Technician(s):
Type of Survey:
Comments and Data regarding surface scans (if performed)
Investigation Gross Characterization Co-60 Remediation Cs-137 Final Survey Instrument:
Other / Describe:
Map Sample Set Easting Northing Sampling Comments 1
RCA-BBBB-xx-B 2
RCA-BBBB-xx-B 3
RCA-BBBB-xx-B 4
RCA-BBBB-xx-B Al,lltQFFDE -
lllelff..a,,,,I Proposed Soil Sample 0
OCNGS FSS Survey Areas JU6*-Pf!:l*l---,.-i-4u1-1 ylvani1 0~Vak
~-'--~---------, --
0 ftil~a 0
RSCS TSD 24-111 Page 13 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station Geoprobe Target Area Maps
RSCS TSD 24-111 Page 14 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station (Continued)
Geoprobe Target Area Maps
RSCS TSD 24-111 Page 15 of 15 Surface/Subsurface Characterization Survey Plan for Oyster Creek Nuclear Generating Station (Continued)
Geoprobe Target Area Maps