ML18019A660
| ML18019A660 | |
| Person / Time | |
|---|---|
| Site: | 07000036 |
| Issue date: | 01/09/2018 |
| From: | Westinghouse |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML18019A532 | List:
|
| References | |
| HEM-18-2 | |
| Download: ML18019A660 (20) | |
Text
LSA 05-04, l l/12/2015 Procedure: HDP-PR-FSS-701, Final Status Survey Plan Development Hematite Decommissioning Revision: 9 Appendix P-3 Survey Area:
Survey Unit:
Project LSA 05 APPENDIX P-3 FSS PLAN
==
Description:==
Central Open Land Area (Tc-99 SEA)
Page I of 8
==
Description:==
Class 1 Area 16"; (former Cistern Burn Pit, Red Room Roof Burial Area)
Overview:
The Survey Unit (SU) identified as LSA 05-04 has been prepared for Final Status Survey (FSS) by the Hematite Decommissioning Project (HOP). This appendix provides an overview of the proposed FSS implementation as well as general and specific instructions for the technicians responsible for performing the FSS.
Data Quality Objectives
- 1. Personnel performing FSS duties meet the qualifications listed in HDP-PR-HP-102, Health Physics Technician Training and have received training and instruction commensurate with their duties. The RSO has approved al I FSS personnel to perform work associated with their individual roles and responsibilities. Training records are documented in accordance with HDP-PR-GM-020, Training Material Development and Documentation of Training.
- 2. All HOP FSS procedures (700 series") have been reviewed, revised, and validated in order to ensure performance of actual FSS work activities reflect the requirements detailed in the individual FSS Procedures and the HDP Decommissioning Plan.
- 3. All FSS instrumentation has undergone a receipt inspection by HDP QA personnel, is within current calibration, and is determined to be functioning within acceptable ranges based on initial set-up and daily source checks in accordance with HDP-PR-HP-411, Radiological lnstrumentaLion. Prior to field use. HP technicians will confirm that environmental conditions (e.g. operating temperature range, no standing water) are acceptable for use of FSS instrumentation.
Location LSA 05-04 is designated Class 1 and is located in the Barns and Cistern Open Land Area and includes the former Cistern Burn Pit.
This SU is partially located within the Technetium (Tc) Surrogate Evaluation Arca (SEA); therefore. as a conservative measure, the Tc-99 SEA DCGLs were used only for Scan MDC calculations where the inferred Tc-99 DCGL for U-235 is 1.2 pCi/g.
The surrogate DCGL for U-235 was used for the calculation of Scan MDC only.
Laboratory analysis for Tc-99 will be performed on all final status survey samples and as such, the adjusted U-235 DCGL values will not be used to demonstrate compliance with the final HDP Satellite Site View LSA 05-04 in Red Crosshatching status survey dose criteria. The two-dimensional areal extent of LSA 05-04 is 2,027 m2 upon which the systematic sampling grid is based. The interior surface area (three-dimensional) of Survey Unit LSA 05-04 is 2.135 nl.
Quality Record
LSA 05-04, 11/12/2015 Procedure: HDP-PR-FSS-70 I, Final Status Survey Plan Development Hematite Decommissioning Revision: 9 Appendix P-3 Project Page 2 of 8
Background
Remedial actions commenced in LSA 05-04 in December 2012 and completed in September 2015.
Waste materials removed during the remedial action included contaminated soils and building debris.
The remedial excavation was generally shallow across the LSA (average excavation depth of approximately 1.0 ft, maximum depth of - 6 ft in the cistern pit), with an estimated quantity (in situ) of removed materials of 1,961 cubic yards.
LSA 05-04 was subject to final Remedial Action Support Surveys (RASS) during the month prior to Isolation and Control (I & C) posting finalization on November 12, 2015. RASS included 100% gamma walkover survey (GWS), systematic (8-point grid), and biased sampling.
A portion of the LSA 05-04 land area was subject to NCS controls. Eleven ( 11) Nuclear Criticality Safety (NCS) borings were pe1formed within the footprint of LSA 05-04. These borings were conducted for the purpose of downgrading from nuclear criticality safety (NCS) controls and to provide additional radiological information to determine if the area was ready for Final Status Survey. These borings were perfo11ned from a minimum depth of 3 feet below the excavation surface on a grid with maximum spacing of 20 feet between boreholes.
Radiological surveys were pe1forrned on the soil spoils, and within the borehole when conditions permitted (i.e., were not filled with water). The radiological surveys were performed by Health Physics Technicians and consisted of dual independent scans of both the soil spoils and within the borehole. The highest readings obtained within LSA 05-04 were zero (0) net counts per minute (ncpm) on the spoils material and 16,000 ncpm within the boreholes - well below the NCS screening limits.
Within LSA 05-04 there was one hybrid monitoring well, CB-02 which was abandoned prior to 2011.
Water sample results from this well did not exceed the BTV for Uranium or the MDC+E1Tor for Tc-99.
Criteria All FSS analytical results for samples collected within LSA 05-04 will be evaluated against the Uniform Stratum DCGLs. FSS sampling is implemented using the Three-Layer CSM, however analytical results will be conservatively evaluated using the Uniform Stratum DCGLs. Three-Layer CSM DCGLs may be utilized for FSS data evaluation if necessary.
II I l"l.
- 1... n, I
~
, \\ :lhll'S (
Uniform Radionuclide
'urf:u:l ~tr.1t11
- J )01 ',(f,llll l':t\\ :Ilion Stratum
,,r.1tum (pCi/g)
Radium-226+C 0
\\
\\
. \\
195.4 Technetium-99
\\
... \\
\\
51.6 Thorium-232+C 0
\\
\\
!\\
168.8 Uranium-234
\\
'\\
\\
25.1 Uranium-235+Dc
\\
\\
\\
2.0 Uranium-238+Dc 1.9
' Table adapted from HOP FSS Procedure HOP-PR-FSS-701 Final Stallls Sun1ey Plan Development, Rev1s1on 9. October 2015.
b The reported DCGL,.s are the activities for the parent radionuclide as specified and were calculated to account for the dose contribution from insignificant radionuclides.
<+D indicates the DCGL. includes short-lived (half-life :S 6 mo.) decay products.
d +C indicates the DCGL" includes all radionuclides in the associated decay chain.
Quality Record
LSA 05-04, 11/12/2015 Procedure: HDP-PR-FSS-701, Final Status Survey Plan Development Hematite Decommissioning Revision: 9 Appendix P-3 Project Page 3 of 8 Implementation As a Class 1 SU, LSA 05-04 will undergo a 100% gamma walkover survey (GWS) using an uncollimated 2" x 2" sodium iodide (NaJ) detector. Remaining interior sidewalls will be scanned by holding the probe as closely as possible to the sidewall moving the probe up and down the sidewall face while advancing.
Based on a statistical evaluation of the RASS dataset, a minimum sample size of eight (8) FSS locations was required. All locations were systematically distributed on a triangular grid pattern with a random start point. Seven (7) surface stratum samples. seven (7) root stratum composite samples, and eight (8) excavation stratum grab samples will be taken at the 8 systematic sample locations. However, the excavation stratum samples will be archived and analyzed only if the overlying root stratum sample at as given location exceeds a SOF of 0.5.
Consideration of residual Tc-99 "hot spots":
Previous characterization data collected prior to remediation indicated one sample exceeding the Uniform Stratum DCGL for Tc-99 in LSA 05-04, with a result of 32.1 pCi/g at the surface (see sample "NB-125-0.5-SL" from Hematite Radiological Characterization Report, Westinghouse, 2009). This elevated activity material was likely removed during remediation, however as a conservative approach, 32.1 pCi/g is used as the maximum reasonable residual Tc-99 activity for the purposes of determining an FSS sample population adequate to address the potential for residual Tc-99 *'hot spots". Dividing this result by the Tc-99 Excavation DCGL gives an Area Factor of 1.28 which corresponds to an area of 807 m2 per sample station (A'). Since this value far exceeds the current A' of 253 ni based on an 8-point sampling grid, no increase in sample size is necessary. Note the maximum final RASS result for Tc-99 in the SU was 9.37 pCi/g.
Biased samples may be collected after a statistical review (e.g. greater than 3cr above mean) of the entire GWS dataset based upon the professional judgment of the FSS Supervisor.
A minimum of one QC duplicate per SU (or 5% of the total number of samples) will be collected. Since the total number of samples is expected to exceed 20, two QC duplicate samples will be collected within LSA 05-04.
Supplemental Sidewall Sampling: The need for supplemental sidewall sampling will be evaluated based on the requirements of HDP-PR-FSS-701 (Revision 8, Step 8.2.8.k-l.) Sidewalls are defined as vertical or near vertical(> 45° angle) su1faces inside the SU limits which are at least 12" in height. Since there are remaining interior sidewalls which exceed 5% of the total surface area of the SU, supplemental sidewall sampling will be performed.
Given that the difference between the 30 surface and 20 planar areas of the SU (108 m 2
) is less than the area bounded by each systematic sample (253 rn2); the sidewall sampling requirement is one (1) sample.
This sample location will be judgmentally selected at a point on an internal sidewall and will be collected as a six (6) - inch vertical grab.
Quality Record
LSA 05-04, 11/12/2015 Procedure: HDP-PR-FSS-70 I, Final Status Survey Plan Development Hematite Decommissioning Revision: 9 Appendix P-3 Project Page 4 of 8 FSS IMPLEMENTATION
SUMMARY
TABLE Gamma Walkover Survev (GWS):
Scan Covera.u,e I 00% exposed excavation floors and walls 40.9 pCi/g total Uranium (based on a Scan MDC l 0,000 cpm background); 0.87 pCi/g Th-232; l.21 pCi/g Ra-226*
Investigation Action Level (JAL) 4,000 net cpm **
Svstematic Sampline Locations:
Depth Number of Sample Comments 0 - 15 cm (Surface) 7 15 cm - 1.5 m (Root) 7 These samples will be taken on a random-start systematic grid.
- Except for LOS-04-04, excavation
> I.Sm (Excavation) 8***
samples will be archived and analyzed only if the overlying root stratum results exceeds a SOF of 0.5 Biased Survev/Sampline: Locations:
Biased samples may be collected during GWS at the discretion of the HP Technician, after statistical analysis of the survey data, or at the direction of the FSS Supervisor.
SidewaU Sampline: Locations:
One (1) discretionary sidewall sample will be collected based on the following definition of "sidewall": sidewall candidates for sampling must be vertical or near vertical(> 45° angle) and at least 12" in height.
Instrumentation:
Ludlum 222 1 with 44-10 (2x2 Na!) detector; I Used for GWS and to obtain static count rates with collimation for investigations at biased measurement locations.
- Values based on information provided in HDP-TBD-FSS-002, "Evaluation and Documentation of the Scanning Minimum Detectable Concentrations (MDC) for Final Status Surveys (FSS). The Scan MDC for total Uranium reflects a conservative assumption of 4% enrichment. The actual RASS enrichment (2.5%) would result in Scan MDC values slightly less than those calculated for FSS planning purposes.
- JAL is the net count per minute (ncpm) equivalent of an activity concentration less than the Uniform Stratum DCGLw derived from the technical bases presented in HEM-MEM0-15-021 and HDP-TBD-FSS-003 "Modeling and Calculation of Investigative Action Levels for Final Status Soil Survey Units", Westinghouse, March 2015.
Quality Record
LSA 05-04, 11/12/2015 Procedure: HDP-PR-FSS-70 I, Final Status Survev Plan Development Hematite Decommissioning Revision: 9 Appendix P-3 Project Page 5 of 8 General Instructions:
- l. Sununarize daily work activities on the log sheets provided in Appendix P-6. Provide a description of site conditions (including the condition of isolation controls), samples collected and the status of gamma walkover surveys for every shift that involves work in this survey unit. Document the surveyor name and instrumentation used for each GWS event (i.e., data file) in Appendix P-6 for reporting traceability.
In the event that a situation arises where the survey instructions cannot be followed as written, stop work and contact the FSS Supervisor for resolution. All changes to the survey instructions shall be approved by the RSO before continuing work and be documented in the FSS Field Log.
- 2. In accordance with HDP-PR-FSS-70 I, Final Status Survey Plan Development (Sec. 8.4.2),
documentation of activities performed, equipment used, and potential safety hazards that may be encountered during the performance of characterization activities (along with associated controls) will be documented using the FSS Daily Task Briefing log sheet.
- 3. Verify that isolation controls established in accordance with HDP-PR-HP-602 are in place prior to the start of FSS. Ensure isolation controls include, as necessary, the use of "wattles", a berm, or trenching to minimize the potential for contaminated soils and water from surrounding areas to cross the boundary of this unit.
- 4. Perfonn daily pre and post QC source checks in accordance with HDP-PR-HP-416.
- 5. A gamma walkover survey (GWS) will be performed using a 2"x2" Nal (Tl) detector. Move the survey probe in a serpentine pattern approximately 6-inches off-set from centerline to the body (e.g., "shoulder-to-shoulder") with the probe as close to the surface as possible; maintaining the detector as close as possible to the surface (nominally l", but not to exceed 3-in. distance from the surface). The meter will be moved at a speed of approximately 0.3 meter (or 1.0 feet) per second or less. The gamma walkover survey will cover the percentage of the exposed surface areas within the area of interest as indicated in the table above. Notify the FSS Supervisor of any areas, conditions or constraints where surveying (or subsequent sampling) may not be possible. Document the conditions and any resolutions in the FSS Field Log.
- 6. A GPS system and data logger should be interfaced with the meter. The downloaded information will then be used to prepare maps illustrating relative count rates and to perform statistical analysis of the data. If a GPS data logging system is not available, contact the FSS Supervisor to determine specific instructions for performing and documenting gamma walkover surveys.
- 7. LSA 05-04 is a Class 1 Survey Unit. Each systematic sample location has associated GPS coordinates specified.
ln the case of inaccessible sampling locations, additional sample coordinates may be generated with the FSS Supervisor's and RSO's approval in order to identify an acceptable sampling location. Any adjustments to sampling locations will be documented in the FSS Field Log, new sample location coordinates wi II be recorded, and the FSS Supervisor will be notified.
- 8. A map of the survey unit showing predetermined sample locations with associated GPS coordinates will be generated. A copy of the sample map and survey locations will be attached to d,e survey instruction.
- 9.
At each systematic soil sampling location, a composite soil sample will be collected from each location and depth as determined after the completion of excavation (and will be provided in Appendix P-4). The systematic sample locations will include seven (7) samples taken at a depth of O - 15 cm (surface), seven (7) samples collected at a depth of 15 cm - 1.5 m (root). and eight (8) samples collected at a depth of 1.5 m to 1.65 m (excavation).
Qua I ity Record
LSA 05-04, 11 /12/2015 Procedure: HDP-PR-FSS-70 I, Final Status Survey Plan Development Hematite Decommissioning Revision: 9 Appendix P-3 Project Page 6 of 8 IO. Biased soil sampling locations may be determined at the discretion of the HP Technician during the performance of the GWS. Biased soil sampling locations may also be determined at the discretion of the FSS Supervisor based on statistical analysis of the survey/sampling data or process/historical knowledge of the area. Biased soil samples will be collected in a manner similar to systematic soil sampling locations. Radiological Engineer and/or the HP Technician will log the reason for collection of biased samples in the Field Log sheet and record the location of biased samples on Appendix P-4 of this survey instruction.
NOTE: If trash, waste, or other non-native materials are observed during sample collection, stop sampling activities and notify HP Supervision (or Radiological Engineering) before collecting samples at any sample location in the unit.
- 11. Supplemental Sidewall Sampling: One (I) discretionary sidewall sample will be collected based on the following definition of "sidewall": sidewall candidates for sampling must be vertical or near vertical (>
45° angle) and at least 12" in height. Sidewall samples will be collected in a vertical orientation as six-inch grabs and are not to be biased toward elevated count rate measurement locations.
- 12. All samples collected as part of this survey will be analyzed at an off-site laboratory by gamma spectroscopy for radium, thorium, and uranium. and TCP-MS for Tc-99.
Specific Instructions:
NOTE: Unless otherwise indicated, the performance of these specific instructions is the responsibility of the HP Technician.
Before Beginning Work
- 1. Rad. Engineer/HP Technician: Verify, each shift, that isolation controls, established in accordance with HDP-PR-HP-602, are in place prior to the start of FSS using the Daily Task Briefing log sheet.
- 2. Rad. Engineering/HP Technician: Prior to gamma walkover survey in the area to be surveyed, walk the area looking specifically for any debris material (e.g. asphalt, plastic, concrete, etc.) that may indicate further remediation efforts are necessary.
- 3. Rad. Engineer/HP Technician: Perform a daily task-specific briefing; documenting tl1e attendants, planned work activities, anticipated hazards, and controls on the FSS Daily Task Briefing log sheet.
NOTE: If soil sampling to a depth greater than one foot is required, ensure HDP Safety & Health is aware of the activity, an Excavation Permit (Form HDP-PR-EHS-021-1) has been performed for the work area, and underground utilities have been identified and marked.
Gamma Walkover Surveys (GWS)
- 1. Establish a general area background, in accordance with HDP-PR-FSS-71 I. Use this background level in conjunction with the investigation Action Level (IAL) of 4,000 net counts per minute as a field guide to pause and, if necessary, flag locations for possible biased sampling (see following Steps 2 and 3 below for details).
- 2. Perform a gamma walkover of the survey unit holding the probe as close to the surface as possible (nominally I", but not to exceed 3"), in accordance with HDP-PR-FSS-71 I.
- a. Look and/or listen for elevated count rates and then pause to determine locations that exhibit anomalous readings (e.g., count rates that exceed the IAL for this unit).
Quality Record
LSA 05-04, 11/12/2015 Procedure: HDP-PR-FSS-70 I, Final Status Survey Plan Development Hematite Decommissioning Revision: 9 Appendix P-3 Project Page 7 of 8
- b. Mark the location(s) exhibiting anomalous readings to facilitate possible future investigations (for example, use a flag, stake, or other marking resistant to anticipated environmental conditions).
- 3. At each location where anomalous readings occur, perform a more detailed point survey of the area.
Pause and place the survey probe as close as possible to the surface to define and record the total count rate associated with the area of interest on the Field Log.
NOTE:
If field conditions limit the ability to perform contact readings, collect readings as close as practical.
Contact the FSS Supervisor (or Radiological Engineering) regarding the issue for each location.
The FSS Technician, FSS Supervisor, and/or Radiological Engineer will log the issue (and resolution) for each location in the FSS Field Log and on applicable HDP survey forms.
- 4. GPS (and associated data logger) is the preferred method for performing GWS.
When a GPS and data logger is used, down load and provide the survey data to a GIS Specialist.
- a. GIS Specialist: Provide colorimetric maps indicating survey coverage and measurements exceeding the IAL and send the survey data to the FSS Supervisor.
- b. FSS Supervisor: Provide statistical analysis to determine population characteristics of the survey data set and identify any areas requiring additional surveys or sampling. Contact FSS Technician to mark additional locations requiring survey or sampling.
If a GPS and data logger cannot be used to perform GWS in any portion of this survey unit, the FSS Technician will contact the FSS Supervisor and RSO to determine compensatory survey methods.
The FSS Supervisor will log the compensatory methods in the FSS Survey Log.
Download the survey data at the end of each shift. To minimize data loss, periodically save the GWS data set to an external backup drive.
Soil Sampling
- 1. Collect soil samples in accordance with HDP-PR-FSS-711 at locations identified in Appendix P-4. Note that additional biased sampling locations may also be listed as determined by the GWS or as detem1ined by the FSS Supervisor.
- 2. Collect a minimum of one duplicate sample for every 20 samples. A minimum of one duplicate sample is required for each survey unit.
- 3. Collect and homogenize the entire volume from the specified depth interval prior to containerizing the sample. When collecting the composite samples, vegetation and native debris/rocks with a diameter greater than I inch should be discarded.
NOTE: If a discrete source of radiation (e.g., a fuel pellet) is discovered during the performance of sampling activities, contact the FSS Supervisor who will then notify the RSO. Pause any additional characterization work in the immediate area and use a plastic bag to contain the material. Label the plastic bag per HDP-PR-HP-20 I, Section 8.2 "Labeling Radioactive Material" and transfer the material from the survey unit for controlled storage in the Building 230 Sample Cage via physical turnover to the shift Sample Custodian.
Quality Record
LSA 05-04, 11 /12/2015 Procedure: H DP-PR-FSS-701, Final Status Survey Plru1 Development Hematite Decommissioning Revision: 9 Appendix P-3 Project Page 8 of 8
- 4. Monitor the count rates observed at all exposed surfaces within close proximity (e.g., 2 meter diameter) of each biased sampling location, as practical. Note any accessibility issues and discuss compensatory measures with supervision.
- a. Inform the FSS Supervisor of the results obtained from monitoring the locations of biased sampling to receive instructions for further investigation or the need for additional excavatjon.
- 5. Collect bias samples from the surface to a depth of 6 inches.
- 6. Collect one supplemental sidewall sample as a 6-inch thick grab srunple, from a judgmentally selected location. Sidewall samples are not to be selected based on elevated count rate measurements.
- 7. Monitor the count rates within the depression created by the collection of biased soil samples.
- 8. Obtain and record the count rate on contact with features other than soil within the excavation. (e.g.,
native rock). Record the nature and extent of features other than soil found within the excavation in the FSS Survey Log and contact the FSS Supervisor to determine additional characterization methods, if necessary.
- 9. Submit samples for analysis to TestAmerica following sample chain of custody requirements contained in HDP-PR-QA-006.
Prepared by:
Brian A. Miller
~~Wfl-
,1/,:;.J,5 (Print Name)
(Signatme)
(Date)
Peer Reviewed by:
Ellen C. Jakub
~~ 11/r1-t,s-(Print Name)
(Signare)
(i:fue)
Approved by
~~ ///;7/!f (RSO):
W. Clark Evers (Print Name)
(Signature)
(Date)
Quality Record
Hematite Decommissioning Project Procedure: HDP-PR-FSS-70 l. Final Status Survev Plan Development r--"---- -~- ----11 Revision: 9 APPENDIX P-1 Appendix P-1 Page l of 10 FINAL STATUS SURVEY SAMPLING PLAN DEVELOPMENT CHECKLIST FOR SOIL SURVEY UNITS Survey Area:
LSA 05 Survey Unit:
04
==
Description:==
Barns and Cistern Open Lan<l Area (Tc-99 SEA)
==
Description:==
Class 1 Survey Unit in Cistern Burn Pit, Red Room Roof Burial Area - in '*Area 16"
- 1. Verify Survey Unit Isolation & Control Survey Unit properly isolated and/or controlled (indicated by outlining the area with green rope and posting lhe appropriate signage) as required by HDP-PR-HP-602. Data Package Development and Isolation and Control Measures to Support Final Status Survey?
Yes!ZI NoO (If "No... discontinue survey design until area turnover requirements have been met.)
- 2. Evaluate Final Remedial Action Support Survey (RASS) Data
- a.
Number of RASS Samples = 8
- b.
Record analytical results and summarv statistics for each RASS sample.
Minimum Maximum Mean Median Standard Deviation
(pCi/g) foCi/!2.)
(pCi/g) 1.077 0.060 0.226 0.014 14.298 0.788 3.530 9.370 4.680 0.256 1.397 1.751 2.286 0.123 1.023 0.214 5.180 0.287 1.055 3.267 8
8 8
8 Th-232 (pCi/g) 0 (< BKG) 0.180 0.033 0.000 0.063 8
Ra-226 (pCi/g) 0 (< BKG) 0.000 0.000 0.000 0.000 8
- c.
Are all RASS results less, or equal to the appropriate DCGLw from Appendix A of HDP-PR-FSS-70 I?
Y cs!ZI NoO
- d.
If No... have remaining locations of elevated concentration been evaluated? NI Ai:;g] YesO NoO (If *'No", discontinue survey design until investigation is complete.)
- e.
Have elevated areas identified by gamma walkover surveys been investigated? NI Ai:;g] YesO NoO (If *'No, then terminate survey design and perfonn additional investigation and repeat the planning process.)
- f.
Are the Initial Characterization and RASS data sufficient to support FSS Design?
Yes[8] NoO (If No, terminate survey design, perform additional characterization or remediation and repeat the planning process.)
- 3. Define the Survey Unit Classification W1ite a short description of the survey unit based on historical use and remedial activities:
The LSA 05-04 survey unit (SU) is classified as MARSSIM Class 1. It is located in the north western portion of the HOP Site. in the Barns and Cistern Bum Pit/Red Room Roof Burial Area, or Area 16". This SU aJong with LSA 05-01, LSA 05-02, and LSA 05-03 are collectively referred to as *'Area 16 for the purposes of remediation planning and work sequencing. This SU is partially located within the Tc-99 Surrogate LSA 05-04
Hematite Decommissioning Project Procedure: HDP-PR-FSS-701, Final Status Survey Plan Development Revision: 9 Appendix P-1 Page 2 of 10 APPENDIX P-1 FINAL STATUS SURVEY SAMPLING PLAN DEVELOPMENT CHECKLIST FOR SOIL SURVEY UNITS Evaluation Area (SEA).
Classification: 1 Survey Unit Area (ni2): 2,027
- a.
Has the Classification changed from the Initial Classification as indicated in DP Ch. 14 Table 14-16 and Figures 14-14 through 14-17?
YesO No~
(If "Yes, then include a copy of Appendix P-5, Survey Unit Classification Change Form.)
- b.
Is the Survey Unit area less than the maximum size for the Classification?
Yes~ NoO (If "No", then tenninate survey design and evaluate dividing the survey unit into multiple survey units.)
- 4. Define the Surrogate Evaluation Area (SEA)
Select the appropriate SEA as input to calculating scan sensitivity and variability in the RASS SOP.
Plant Soils SEA D Tc-99 SEA ~
Burial Pit SEA D
- 5. Define Final Survey Unit Conditions D No Excavations, Paved/Partially Paved or Excavated but not Backfilled
~ Excavated and to be Backfilled D Excavated and Backfilled Note: If a portion of a Survey Unit is paved, then Surface Soil Stratum begins at the bottom of the paved surface and extends 15 cm from that point below grade. The lower depth of the Root Stratum remains at 1.5 m below grade. The pavement is then treated as a separate structural Survey Unit within the Survey Area.
- 6. Define the Type of FSS Samples and Measurements Select the appropriate types of samples and measurements for FSS of this Survey Unit that corresponds to the final condition and survey classification of the Survey Unit.
Not Excavated, Paved/Partially Paved or Excavated and to be Backfilled:
Excavated but not Backfilled:
D Surface Soil (<15cm) Samples.
D Root Stratum Soil Samples composited from 15cm to 1.5m.
~ Surface Soil Samples taken from any remaining surface soil Stratum and Root Stratum Soil Samples taken at the same locations as Surface Samples, composited over the entire root stratum.
~ Root Stratum Soil Samples composited from exposed grade to 1.5m and Deep Stratum Soil Samples taken at the same locations as Root Samples of the top 15cm of the Deep Stratum.
LSA 05-04
Hematite Decommissioning Project Procedure: HDP-PR-FSS-701, Final Status Survey Plan Development Revision: 9 Appendix P-1 Page 3 of 10 APPENDIX P-1 FINAL STATUS SURVEY SAMPLING PLAN DEVELOPMENT CHECKLIST FOR SOIL SURVEY UNITS D Deep Stratum Soil Samples of the top 15 cm [g] Deep Stratum Soil Samples of the top 15 cm of the of the Deep Stratum.
exposed Deep Stratum.
Note: If the SOF of the Root Stratum sample exceeds 0.5. a composite sample is collect from 1.5 meters to an appropriate depth (Deep Stratum).
Excavated and Backfilled 0
Core through backfill layer to the lowest point where remediation occu1Ted and composite a sample from a coring that extends one meter deeper than the lowest point where remediation occurred.
- 7. Define Derived Concentration Guideline Levels (DCGL)
U-234 U-235 U-238 Tc-99 Select the appropriate DCGL for each Radionuclide of Concern (ROC) based on the corresponding SEA and the Uniform Conceptual Site Model (CSM).
- If Tc-99 was measured during the characterization/RASS survey, then the Measure Tc-99" DCGLs will be used from Appendix A of HDP-PR-FSS-701.
("Infer Tc-99") will be used from Appendix A HDP-PR-FSS-701.
Surface Stratum (pCi/g)
\\
Root Stratum (pCi/g)
'\\
\\
Deep Stratum 1
(pCi/g)
Uniform (pCi/g) 195.4 51.6 168.8 25.1 Th-232 + C 2.0 Ra-226 + C 1.9 I.
The Deep Stratum DCGLs correspond to the Excavation Scenario DCGL from Appendix A of HDP-PR-FSS-70 I.
- 8. Determine the Number of Samples in the Statistical Survey Population Note:
The statistical sw*vey population is routinely derived based on the Uniform DCGL.
Alternatively, if the Survey Unit excavation extends into multiple CSMs (e.g. surface, root &
deep), then the DCGL(s) from the most limiting strata can be used with the equations below; OR If the excavation significantly extends into the Deep Stratum, then the alternate approach presented in Step 8.2.5 of HDP-PR-FSS-701 may be used for determining the mean SOF and weighted standard deviation that accounts for the reduced dose from the deeper surface, i.e., by weighting the Root Stratum and Excavation DCGLw values.
The values used in determining the following (SOFmean and crsoF) can be found in the tables from Section 2b and Section 7.
LSA 05-04
Hematite Decommissioning Project Procedure: HDP-PR-FSS-701, Final Status Survey Plan Development Revision: 9 APPENDIX P-1 Appendix P-1 Page 4 of 10 FINAL ST A TVS SURVEY SAMPLING PLAN DEVELOPMENT CHECKLIST FOR SOIL SURVEY UNITS
- a.
Determine a mean SOF for the characterization/RASS survey data set using the equation from Step 8.2.5a ofHDP-PR-FSS-701.
Lower Bound of the Grey Region (LBGR) = SOFMcan = 0.12
- b.
Determine the weighted standard deviation in the SOF for the characterization/RASS survey data set using the equation from Step 8.2.Sb ofHDP-PR-FSS-701.
Note: For the detemlination of SOFMean and crsoF, include the concentration for Tc-99 if it was measured.
If Tc-99 was not measured, include the modified U-235 DCGL and omit Tc-99 concentration term.
Survey Unit CTsoF =
Background crsor=
- c.
Define the Decision Errors.
Type I Error = 0.05 0.14 0.14
./ Larger of the two used in worksheet survey design Type 11 Error = 0.10 D
~
Note: The Type II Error is set at 0.1 0 initially but it may be adjusted with RSO concw-rence.
- d.
Determine the Relative Shift using the equation in Step 8.2.Sd ofHDP-PR-FSS-701.
Relative Shift=
6.21 *
- Spreadsheet value may differ from hand-calculated results due to rounding.
- e.
Is the Relative Shift between 1 and 3?
YesD No~
If "Yes", then continue to Step 8f.
If "No", then adjust the LBGR as necessary to achieve a relative shift between 1 and 3. In order to accomplish this, the LBGR may be set as low as the MDC for the analytical technique.
Adjusted LBGR = 0.58 Adjusted Relative Shift = 3.0
- f.
Determine the Number of Samples (N/2) required corresponding to the Type I error, Type II Error and the Relative Shift from Appendix For calculate using equation 5-1 from MARSSIM.
No. of Samples (N/2) = 8
- 9. Determine the Scan MDC for Total Uranium When U-235 is reported as negative or zero and U-238 is reported as positive, set the sample enrichment to 0. 72% (natural uranium).
When U-235 is reported as positive and U-238 is reported as negative or zero, set the sample enrichment to 100% (highly enriched).
When both U-235 and U-238 data are rep011ed as positive, determjne the U-238/U-235 ratio for each sample and use Appendix G of HDP-PR-FSS-701, to determine the uranium enrichment that corresponds to the mean U-238:U-235 ratio.
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- a.
Record the average Uranium enrichment for the survey unit using the enrichment determined for each individual sample.
Average Enrichment(%)= 2.54 Note:
The Activity Fractions ( f) for each radionuclide corresponding to the mean enrichment used in the following calculations is obtained from Appendix G of HDP-PR-FSS-70 l.
If the Uniform DCGL is not used, and the excavation extends into multiple CSMs (e.g. surface, root & deep), then the most conservative DCGLs should be used in the following calculation.
- b.
Determine a DCGLw for Total Uranium using the equation from Step 8.2.6b of HDP-PR-FSS-701.
DCGLwrotU for Total Uranium =
26.4 pCi/g
- c.
Identify the Radiological Instrument that will be used for scanning.
~
2x 2" NaI Detector D
FIDLER NaJ Detector D Other -------
- d.
Determine the Scan MDC for the selected instrument using the equation in Step 8.2.6d of HDP-PR-FSS-70 I or the calculations presented in the Open Land Area Gamma Scan MDCs section in Chapter 14 of the DP.
MDCscan for Total Uranium=
40.9 pCi/g
- a.
Select the appropriate DCGLw for Th-232 and Ra-226 corresponding to the soil strata that wil I be exposed at the time ofFSS and the SEA where the survey unit is located.
Th-232 DCGLw 2_0 pCi/g Ra-226 DCGLw = 1.9 pCi/g Note:
If the Uniform DCGL is not used, and the excavation extends into multiple CSMs (e.g. surface, root
& deep), then the most conservative DCGL for the strata should be used. With RSO concurrence, the alternate approach as presented in DP Ch. 14, Section 14.4.3.1.10 may be used in lieu of using the most conservative.
- b. Determine the Scan MDC for the selected instrument Note:
HDP-TBD-FSS-002 documents the calculated MDCscan of 0.87 pCi/g for Th-232 and 1.21 pCi/g for Ra-226 when using a 2"x 2" Nal detector with a background of 10,000 cpm. If a different background is indicated, see Appendix C of HDP-TBD-FSS-002 for the appropriate MDCscan*
Note:
If the selected instrument is not a 2"x 2" Nal detector, then the MDCscan can be determined in accordance with the Open Land Area Gamma Scan MDCs section in DP Ch. 14.
MDCscan for Th-232 = 0.87 pCi/g MDCscan for Ra-226 = 1.21 pCi/g Note: If a value is not applicable, mark as N/ A.
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- 11. Adjust the Statistical Sample Population Size (N/2) for Scan MDC
- a.
Is the Scan MDC for the selected instrument less than the DCGLw that was detem1ined for Total Uranium? (compare values from Step 9b and 9d)
YesD Nof2'.I Class 2 and 3 survey units - If "Yes", then proceed to Step 12, if "No", then contact the RSO for direction as to changing parameters for scanning such as scanning speed, detector distance, different instrumentation, etc.
Class l survey units, proceed to the next step.
- b.
Divide the total area of the survey unit by the Number of Samples (N/2) determined in Step 8f to determine the area bounded by the statistical sample population.
Area Bounded by the Statistical Sample Population (Asu) =
2 253.4 m
- c.
Was the Scan MDC for the selected instrument less than the DCGLw that was determined for Total Uranium in Step 11.a?
NAO YesO Nof2'.I (If "Yes", then proceed to Step 12, if "No", then proceed to the next step).
- d.
Using the Area Factors in Appendix H of HDP-PR-FSS-701 and using the equation from Step 8.2.8d of HDP-PR-FSS-701, determine a Total Uranium AF for each listed area using the Activity Fractions (fJ for each radionuclide that corresponds to the mean enrichment from Appendix G of HDP-PR-FSS-701.
Area (mL) 153,375 10,000 3,000 1,000 300 100 30 10 3
1 AFrotalU 1.8 2.0 2.1 2.1 3.9 5.3 7.2 10.4 21.2 45.1 Note: The Afs for the Uniform Stratum will generally be used. The RSO may approve use of AFs from the Surface, Root or Deep CSMs, or the Excavation Scenario.
- e.
Find the Area Factor (AFr01a1u) detem1ined in the previous step that corresponds to the area bounded by the statistical sample population (Asu).
AFro1u for the Bounded Area (Asu) = 3.9
- f.
Multiply the DCGLw determined for Total Uranium by the Area Factor (AP.ro1u) to derive a DCGLEMC for Total Uranium.
DCGLEMC for Total Uranium = 102.2 pCi/g
- g.
ls the MDCscan for the selected instrument less than the DCGLEMC that was determined for Total Uranium?
NAO Yesf2'.I NoD (If"Yes", then proceed to Step 1 lk, if"No", then proceed to the next step.)
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- h.
Determine a new AF (AF EMC) corresponding to the MDCscan for the selected instrument by dividing the MDCscan by the DCGLw.
- 1.
Find the Area (A') that corresponds to the Area Factor (AFEMc).
A' for U101a1 = NA J.
Determine an Adjusted Number of Samples CNEMc) for the statistical sample population size that corresponds to the bounded AEMc using the equation from Step 8.2.7j ofHDP-PR-FSS-701.
NEMC coITesponding to A' for U101a1 = NA TECHNETIUM (Tc-99)
- k.
Determine if the maximum reasonable result for Tc-99 from previous Characterization or RASS remaining within the area is greater than the DCGLw for the appropriate CSM and SEA?
N/AO Yes[gj NoO (If "No", then proceed to Step 12, if"Yes", then proceed to the next step.)
- 1.
Determine the area per sample station needed to account for potential Tc-99 hotspots by dividing the highest Tc-99 result obtained by the Tc-99 DCGLw for the appropriate CSM and compare that value to the Area Factor Tables in Appendix H.
A' for potential Tc-99 hotspots= 807
- m. Determine the number of samples needed by dividing the Survey Unit Area by the A' for potential Tc-99 hotspots determined in Step 111.
N corresponding to A' for potential Tc-99 hotspots = 3
- 12. Determine the Grid Spacing
- a.
Larger ofN/2 from Step 8f, the maximum value ofNEMC from Step 1 lj, or N corresponding to A' for potential Tc-99 hotspots from Step 1 lm.
N/2, NEMdmax], or N corresponding to the potential Tc-99 hotspot = 8
- b.
ls the Survey Unit a Class 3 Survey Unit?
YesO No~
([f "Yes", then continue to Step 13, if"No", then proceed to the next step).
- c.
Determine Grid Spacing (L) using the equation from Step 8.2.9 of HDP-PR-FSS-70 I.
Grid Spacing (L) for Survey Unit =
14.5 m
- 13. Generate a Survey Map
- a.
Assign a unique identification number to each sample in the statistical sample population using the guidance and direction provided in Appendix M ofHDP-PR-FSS-701.
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- b.
Generate a graphic representation of the Survey Unit with dimensions and boundaries corresponding to the established reference coordinate system in accordance with Step 8.2.1 0 of HDP-PR-FSS-701.
- c.
Using the reference coordinate system, ascertain coordinates for each sample location.
- d.
Designate sample locations, and location coordinates on Appendix P-4, FSS Sample & Measurement Locations & Coordinates and attach a copy of that form to the FSSP.
- e.
Attach a copy of the developed Survey Map with sample locations to the FSSP.
- 14. QC, Biased & Discretionary Samples
- a.
Randomly choose 5% of the statistical sample population as QC samples in accordance with HDP-PR-FSS-703, Final Status Survey Quality Control.
- b.
Designate QC sample locations, and location coordinates on attached Appendix P-4, FSS Sample & Measurement Locations & Coordinates.
- c.
Designate if any biased samples will be taken at the discretion of the HP Staff designing the survey and the basis for taking them.
Necessary biased samples will be explained on Appendix P-3, FSS Sampling Plan.
- d.
Using the reference coordinate system, determine coordinates for each biased sample location.
- e.
Designate biased sample locations, and location coordinates on attached Appendix P-4, FSS Sample
& Measurement Locations & Coordinates.
- f.
Include discretionary sidewall samples as applicable using guidance in Step 8.2.11. Are discretionary sidewaJl samples required?
NI AO Yes~ NoD (If"No", then proceed to Step 15, if"Yes", then proceed to the next step.)
- g.
Determine the number of san1ples to be collected based on the sidewall surface area compared to the two dimensional systematic surface area.
Number of discretionary sidewall samples = 1 (maximum); may be reduced with FSS Supervisor approval if the actual sidewall surface area is significantly Jess than the CAD-calculated theoretical maxunurn.
- h.
Any discretionary sidewall samples will be taken at randomly chosen location(s) of the sidewall(s)
(i.e., not based on radiological scans) selected at the discretion of the Health Physics Teclmician performing soil san1pling. Necessary sidewall samples will be explained on Appendix P-3, FSS Sampling Plan.
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- 15. Scan Coverage
- a.
The Survey Unit is:
~ Class l 0 Class 2 D Class 3
- b.
Based on the Survey Unit Classification, the scan coverage in this Survey Unit is;
~
100% Scan Coverage of exposed soil O
% Scan Coverage of exposed soil
- c.
Designate any specific scan locations, as determined necessary, on Appendix P-3, FSS Sampling Plan.
- 16. Investigation Levels
- a.
The Survey Unit is: 0 Class 3
- 1) Scan Investigation Levels are set at:
NA cpm
- 2) Sample Investigation Levels are set at 50% of the DCGLw when expressed as the SOF.
- b.
The Survey Unit is: 0 Class 2
- 1) Scan Investigation Levels are set at:
NA cpm
- 2) San1ple Investigation Levels are set at the DCGLw when expressed as the SOF.
- c.
The Survey Unit is:
~ Class 1
- 1) Scan Investigation Levels are set at:
4,000 net cpm
- 2) Sample Investigation Levels are set at the DCGLw when expressed as the SOF.
- 17. Attachments Attach a copy of completed fonns as appropriate:
~ Appendix P-3, FSS Survey Sampling Plan,
~ Appendix P-4, FSS Sample & Measurement Locations & Coordinates D Appendix P-5, FSS Unit Classification Change Form D Appendix P-6, FSS Field Log
~ Survey Unit Figure D Other:
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- 18. FSSP Development Checklist Approval Prepared by:
Peer Reviewed by:
Approved by (RSO):
Ellen C. Jakub (Print Name)
Brian A. Miller (Print Name)
W. Clark Evers (Print Name)
~
~~~ 1 I/,?/, 6 (Signature)
(Date)
(Signature)
(Date)
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Hematite Procedure: 1 lDP-PR-FSS-70 I. Final Status Survey Plan Development Decommissioning Revision: 9 Appendix P-4 Project Page 1 of I APPENDIX P-4 FSS SAMPLE & M£ASl1REMENT LOCATIONS & COORDINATES Sun*ey Area:
LSA 05
==
Description:==
Technctium-99 Soils 0Een Land Area Survey llnit:
04
==
Description:==
Survey Unit in "Barns Area
- Area 16" Survey Type:
FSS ClassificaHon:
Class I Measuremtinl or Sample Surface or Type Start*
End*
Northing**
Easting..
Remarks / Notes ID CSM Elevation Elevation (Y Axis)
(X Axis)
L05-04-0 I -T-S-S-00 Unifomi s
426.0 425.5 864605 826597 Surface 6-i.nch grab L05-04-02-T-R-S-OO Unifonn s
425.5 421.0 864605 826597 Root 4.4-ft composite
, o.;.nJ-o'-, 1-', till I 11fonn
.J21ll j1(),
8(,-l(>()"
- 'o.,<P I,.:~\\,1llnn 6-mdi,nah L05-04-04-T-E-S-OO Unifom1 s
423.0 422.5 864605 826653 Excavation 6-inch grab L05-04-05-T-S-S-OO Uniform s
429.8 429.4 864605 826709 Surface 6-inch ll.fab L05-04-06-T-R-S-00 Unifonn s
429.4 424.9 864605 826709 Root 4.4-ft composite 1 0,-,1-1-r 7-r-1 -\\-(ii)
T 111fo1m s
~2*1'1
.Q..j.j
)<(, l61,;
l\\267!1'1 l,cavallun 6-mdi cral1 L05-04-08-T-S-S-OO Uniform s
426.1 425.6 864557 826569 Surface 6-inch grab LOS-04-09-T-R-S-OO Unifom1 s
425.6 421.2 864557 826569 Root 4.4-ft composite I 05-11.J-I ti-I I S-00 l nifom1
..j 12
..J2(, '
S£q~:;-
s )(,~()l/
I x.;a\\ ntu1n 6 -mdi µ.rab L05 I I-T-S-S-OO Uniform s
425.4 424.9 864557 826625 Surface 6-inch grab LOS-04-12-T-R-S-OO Unifonn s
424.9 420.4 864557 826625 Root 4.4-fi composite I J'i.(l..j. j ~- T S-011
{ mlonu
,D
!f(Jl
~c,..j,~~
,rM,2'i I,,.l\\ allon r,-1nd1 !r.ib L05 l 4-T -S-S-00 Unifonn s
424.2 423.7 864557 826681 Surface 6-inch grab L05-04-l5-T-R-S-OO Unifonn s
423.7 419.3 864557 82668 1 Root 4.4-fl composite I O~-P'-1-16-1-1 -S-00 l nilonn I "I '
~lUi lH,155*
~260{1 I,.;a\\,tt1011 h -1111:h I r,11>
L05 l 7
- T-S-S-00 Unifonn s
430.0 429.5 864557 826737 Surface 6-inch !l.rnb LOS-04-18-T-R-S-OO Unifonn s
429.5 425.1 864557 826737 Root 4.4-fl composite I.0,-0.j t<I. 1-l -S-00 l 111lom L'" I 1'-U, XM'-""'
!Qc., __..,
I,, J\\ atwr r, -1m:h *!rah L05-04-20-T -S-S-00 Uniform s
428.0 427.5 864508 826597 Surface 6-inch grab L05-04-21-T-R-S-OO Unifonn s
427.5 423.1 864508 826597 Root 4.4-ft composite I 115-0-t-' 1 -\\-Oll 111fonn 12.; I
'-1::!'.: h 8( -t508 lU,59.,
I x... a, IIIOI h-11<.:h µrah L05-04-02-T -R-Q-00 Uniform s
425.5 421.0 864605 826597 Root 4.4-ft composite L05-04-22-T-E-Q-OO Uniform s
423. l 4226 864508 826597 Excavation 6-inch grab L05-04-23-T-X-B-OO Unifonn B
TBD TBD TBD TBD SidewaU sample 11 lh...
I,.:,.,Ill t ( I l \\\\.,
\\
1*
s IB l
)
l )
U,t,11(
,!1 0 I.:. 1 I
\\ lk, L' '!.l >
- Elevations arc in feet above mean sea level
\\mnph::,. llltthlighted 111 red,, 111 b1; Distance in feet from lower tell comer of the surface (Structures). each surface has it's own (X, Y) = (0,0); OR
<:,ilkctd anJ arch1,..:d rid111log1ca:
For p1pmg the distance from the begmnong of the survey unit.
nnal~scs perform,J only I I o,..:rl) mg root Surface: Floor= F: Wall = W: Ceiling = C: Roof= R sample ha, a S< )( 1)5 CSM Three-Layer (Surface-Root-Deep) or Umfom1 Type.
Systematic = S, Biased = B: QC =:Q: !Jwestigauon = I Quality Record
Sample ID Start End Northing Depth Depth (feel)
(inches) (inches)
L05-04-01-T-S-S-OO 0
6 864605 L05-04 O] T-R-S-00 6
59 86460">
L05-04-03-T-E-S-OO 59 65 864605 L05-04 04-T-E-5-00 0
6 864605 L05-04-05-T-S-S-OO 0
6 864605 L05-04-06-T-R-S-OO 6
59 864605 L05-04-01-T -E-S-00 59 65 864605 L05-04-08-T -S-S-00 0
6 864557 L05-04-09 T R-S 00 6
59 864557 L05-04-10-T -E-5-00 59 65 864557 L05-04-11-T
- S-S-00 0
6 864557 L05-04-12-T-R-S-OO 6
59 864557 L05-04-13-T -E-S-00 59 65 864557 L05-0414-T-5-S-OO 0
6 864557 L05-04-15-T-R-S-OO 6
59 864557 L05-04-16-T -E-S-00 59 65 864557 L05-04-17 -T-S-S-00 0
6 864557 L05-04"18-T-R-S-OO 6
59 86455/
L05-04 19-T-E-5-00 59 65 864557 LOS-04-20-T 5-00 0
6 864508 LOS-04-21-T-R-S-00 6
59 864508 LOS-04-22-T -E-5-00 59 65 864508 L05-04 Ol-T-R-Q-00 6
59 864605 L05-04 22-T-E-Q-OO 59 65 864508 Easting (feet) 826597 826597 826597 826653 826709 826709 826709 826569 826569 826569 826625 826625 826625 826681 826681 826681 826737 826737 826737 826597 826597 826597 826597 826597 LOS-04-08 -S-S-00 LOS-04-0 -T-R-S-00 LOS O-T-E-S-00 05-04-20-T-S-S-OO 05-04-21-T-R-S-OO LOS-04-22-T-E-S-OO LOS-04-22-T-E-Q-OO stematic Sample Locatf6ns LSA 05-04 2027 m2 Planar Area LOS-04-01-T-S-S-00 LOS-04-02-T-R-S-OO LOS-04-03-T-E-S-OO LOS-04-02-T-R-Q-OO LOS-04-11-T-S-S-OO LOS-04-12-T-R-S-OO LOS-04-13-T-E-S-OO LOS-04-14-T-S-S-OO LOS-04-15-T-R-S-OO LOS-04-16-T-E-S-OO 50 75