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Final Radiological Survey Performed at Ga Sorrento Valley Central Land Area
	ML20210K202
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Site:	07000734
Issue date:	07/28/1999
From:	Lyons B, Maschka P, Joseph Turner; GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER
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{{#Wiki_filter:_ _ _ _ - - - _ _ _ 1 1 I l FINAL RADIOLOGICAL SURVEY l PERFORMED AT GENERAL ATOMICS' SORRENTO VALLEY CENTRAL I LAND AREA I I I I I Prepared by: John Turner, Paul Maschka, Barbara Lyons, Cornelius Stanley, Efraim Ramirez and Kevin Busby [ July 28,1999 !!R* 188u 378?8 6 C PDR

I TABLE OF CONTENTS I INTRODUCTION I S ITE D ES CRIPTION.......................................................... 1 PREVIOUS ACTIVITIES (HISTORY OF USE).......................... ........2 CRITERIA FOR RELEASE TO UNRESTRICTED USE............................... 2 Facilities and Equipment..................................... .......2 I Enriched Uranium....................................... 2 Natural Thori um........................................................3 Beta Guideline Values (thorium)........................................ ..3 Release Criteria for Soil.................................................. 3 Exposure Rate Guideline................................................... 4 I INSTRUMENTATION ..............4 BACKGROUND MEASUREMENTS........................................ .5 Background Measurements for Instmments/ Detectors......................... 5 Background Soil Concentrations of Concem....... 6 Exposure Rate Background...................................... ......6 FINAL S URVEYS PERFORMED........................................ ......6 Objectives and Responsibilities.......................... .. 6 Classification of Area.............................. ...........7 Final S urs ey Plan....................................................... 7 Soil S ampling........................................................... 7 I FINAL SURVEY S UMMARY.................................................... 8 RESULTS O F FINAL SURVEY............................................... 9 S cann i n g........................................................... 9 Fixed M easurements..................................................9 I Removable Contamination Surveys....................................... 10 Exposure Rate Measurements............................ 10 S oil Samplin g............................................... 11 CONCLUS IO N.......................................................... 1 1 I E 11 l lI

TABLES Table 1: USNRC's Acceptable Surface Contamination Levels .. T-1 Table 2: State of CA Acceptable Surface Contamination Levels....... T-2 Table 3: List of Instruments......................... T-3 Table 4: Background Measurements (Obtained from Building 13)... ..... T-5 Table 5: Results of Final Surveys.................... .... T-6 Table 6A: Gamma Spectroscopy Results (pCi/g) of Soil Samples T-7 Table 6B: Exposure Rate Measurements at Soil Sample Locations... ... T-11 Table 7: Background Soil Sample Results................ ... T-13 FIGURES (unoneed) Figure 1: Plan View of General Atomics Site. Figure 2: General Atomics' Sorrento Valley Facilities. Figure 3: Diagram of Sorrento Valley Central Land Area. Figure 4: Alpha Scan Locations and Results. Figure 5: Beta Scan Locations and Results. Figure 6: Fixed Alpha Measurement Locations and Results. Figure 7: Fixed Beta Measurement Locations and Results. Figure 8: Removable Contamination Locations. Figure 9: Exposure Rate Measurement Locations and Results. Figure 10: Surface Exposure Rate Measurement Locations and Results. Figure 11: Soil Sample Locations. APPENDIX " Final Survey Plan for the Sorrento Valley Central Land Area," dated January 26,1999. iii

$ Genera / Atomics Sorrento Valley Central Land Area-Final Radiological Survey Report INTRODUCTION General Atomics (GA) is continuing its effons directed at decontaminating, as appropriate, and obtaining the release to unrestricted use of selected facilities and land areas at General Atomics. 4 GA has recently completed the Final Radiological Survey of the open land area identified as "Sorrento Valley Central Land Area" located at GA's Sorrento Valley Site. GA is requesting both the Nuclear Regulatory Commission (NRC) and the State of Califomia (RIIB) I for the release of the "Sorrento Valley Central Land Area" to unrestricted use. This repon documents the results of the radiological measurements and soil sampling completed on the "Sorrento Valley Central Land Area" and demonstrates that this area meets the approved criteria for release to unrestricted use. The total surface area to be released to unrestricted use is ~ 2.63 2 2 acres or 114,570 ft (10,644 m ), 1 SITE DESCRIPTION I A plan view of the GA Site is shown in Figure 1. The land area identified as "Sorrento Valley Central (SVC)" and its relationship to other facilities at GA's Sorrento Valley Site is shown in Figure 2. A diagram of the SVC open land area is shown in Figure 3. I The SVC land encompasses the area directly east and northeast of the existing So Tento Valley "A," Building 37 South. This land area is also located to the east and southeast of the former "SVA Fuel Manufacturing Facility," Building 37 Nonh, which has been decorr.missioned, dismantled and the site and ::urrounding footprint area released to unrestricted use (SVA Decommissioning Project). A strip along the east boundary of the SVA land area overlaps an adjacent strip along the west boundary of the SVC land area. The SVC land area is almost entirely covered by asphalt and is utilized by employees to park their private vehicles. Tie SVC land area also contains soil within the parking medians which serve as l planters for grass, trees, shrubs, plants and flowers. The ponion of the SVC land that borders the I east side of Building 37 South is also landscaped, as are several other portions associated with this land area. 1 I l ofil

[ ( $ General Atomics Sorrento Valley Central Land Area-Final Radiological Survey Report PREVIOUS ACTIVITIES (HISTORY OF USE) The land area, "Sorrento Valley Central," was classified as an " unaffected area" because it had never been used for work involving radioactive materials. The north half of the parking lot had been used for the temporary storage of radioactive waste boxes from the SVA Fuel Manufacturing Facility Decommissioning Project. These radioactive waste boxes had been properly packaged, sealed and the exteriors surveyed for removable contamination. The exterior removable contamination levels were well below the release criteria. No radioactive waste packages were stored in the south half of the parking lot (there is no history of radioactive materials on the south half of this area). In addition, separate individual Final Surveys have been performed for Building 37 South and Building 37 Tunnel and Tunnel Annex which are all located adjacent to the west boundary of the SVC land area. The results of these Final Surveys demonstrated that the building and tunnels located adjacent to the SVC land area met the approved criteria for release to unrestricted use. The results of these other surveys are documented in separate Final Survey reports which support the request for reletse to unrestricted use of each area. Building 37 South and the Building 37 Tunnel and Tunnel Annex were released by NRC on June 7,1999 (SNM-696 Amendment No. 56). fRITERIA FOR RELEASE TO UNRESTRICTED USE Facilities and Eauioment U.S. NRC's criteria for releasing facilities and equipment to unrestricted use is shown in Table 1. The State of California's guidelines, "DHS Cdteria for Release of Facilities and Equipment to Unrestricted Use," also known as "DECON-1," is shown in Table 2. The primary contaminates of concem for the SVC land area are natural thorium and enriched uranium (i.e., as previously utilized in the former"SVA Fuel Manufacturing Facility"). The applicable NRC guidelines for residual surface activity levels involving natural thorium and enriched uranium are provided as follows: Enriched Uranium The approved guideline values for residual contamination for release to unrestricted use for enriched uranium are provided as follows: 2ofil r

{ b f General Atomics Sorrento Valley Central Land Area-Final Radiological Survey Report 2 2 5,000 dpm/100 cm (averaged over a 1 m area) 2 2 z 15,000 dpm/100 cm (maximum in a 100 cm area if the average over 1 m is met) 2 1000 dpm/100 cm (removable activity) Natural Thonum The approved guideline values for residual contamination for release to unrestricted use for natural thorium are provided as follows: 2 2 1,000 dpm/100 cm (averaged over a 1 m area) 2 2 2 3,000 dpm/100 cm (maximum in a 100 cm area if the average over 1 m is met) 3 200 dpm/100 cm (removable activity) 2 2 As interpreted by the NRC, the average 1000 dpm/100 cm and the maximum 3000 dpm/100 cm should apply to both alpha and beta measurements, independently, for surface contamination involving natural thorium.3 Thorium emits alpha radiation to beta radiation in a 1:0.67 ratio; therefore, the corresponding average and maximum beta guidelines were adjusted to be 670 dpm/100 cm and 2000 dpm/100 cm, 2 2 respectively, for beta monitoring. Since the instmments cannot distinguish between uranium and thorium contamination, the most restrictive activity guideline was used to compare all direct measurements for beta activity. Beta Guideline Values (thorium) The modified guideline values for residual contamination for release to unrestricted use for natural thorium are provided as follows: 2 2 670 dpm/100 cm p (averaged over a 1 m area) 2 2 2 2000 dpm/100 cm p (maximum in a 100 cm area if the average over 1 m is met) { 200 dpm/100 cm (removable activity) 2 Release Criteria for Soil The predominant radionuclides ofconcern found in the soil at General Atomics and the release I " Interpretation of'norium Surface Decontanunation Limits," U.S. Nuclear Regulatory Conunission, February 9,1992. 3 ofl1

+ 6eneral Atomics Sorrento Valley Central Land Area-Final Radiological Survey Report criteria in pCi/g for these radionuclides are provided as follows: Enriched Uranium (U-234 + U-235) 30 pCi/g Thorium (Th-228 + Th-232) 10 pCi/g Deple'-d 'Jranium 35 pCi/g I Cs-137 15 pCi/g Co-60 8 pCi/g If more than one radionuclide exists, the sum of the fractions of the concentrations is calculated as follows: I t 'c L, n.n I C, = The average concentration ofradionuclide iin the sample above background levels. L, = The release criteria for radionuclide i. The sum of the fractions must be less than or equal to one for the sample to meet the release criteria. I Exposure Rate Guidding Exposure rates measured at I m above the surface are not to exceed 10 R/hr above background levels. INSTRUMENTATION g A list ofinstruments used during the radiological surveys is shown in Table 3. The table includes: l (1) a description of the instrument, its model and serial number, (2) a description of the detector (if applicable) and its serial number, (3) instrument ranges, (4) calibration due dates, (5) typical background readings and (6) calibration efficiencies (if applicable). All of the instruments used were calibrated semiannually and afler repair, except for exposure rate meters which were calibrated quarterly. 4 ofil

+ General Atomics Sorrento Valley Central Land Area-Final Radiological Survey Report BACKGROUND MEASUREMENTS Backcround Measurements for Instruments / Detectors Building 13 and its surrounding area on GA's main site was used for conducting background measurements on instruments used for the Final Survey because: (1) there is no history involving radioactive materials or storage of radioactive materials in and around Building 13, and (2) the various surfaces found on the SVC land area could also be found in and around Building 13. For the fixed background measurements, shown in Table 4, the mean and standard deviation for ch 2 surface surveyed with the 100 cm gas flow proportional detector were calculated using equations 8-11 and 8-12 from the draft version of NUREG/CR-58492 as shown below: Equation (8-11) _1 x - D,.,, x, n, Equation (8-12) 1(X-X) /

")

n-1 Minimum detectable activities (MDA s) for each type of surface (see Table 4), were calculated using equation (5-2) from the NUREG/CR-5849 as shown below: Equation (5-2) 2.71 +4.65/B,x t 2 MDA= (dpm/100cm ) ^ txEx 100 Where: Ba = aackground rate (cpm) t = count time (min) E = cfficiency 2 A = area of the detector (cm ) 2 Manual for Conducting Radiological Surveys in Support of License Termination (Draft for Comment), NU AEG/CR-5849, ORAU-92/C57, Oak Ridge Associated Universities, June 1992. S ofil

f GeneralAtomics Sorrento Valley Central Land Area-Final Radiological Survey Report Backcround Soil Concentrations of Concern Typical radionuclide background concentrations measured by gamma spectroscopy in soil near the GA site have been established (at the 95% confidence level) and are provided in Table 7 with the locations where these samples were taken. Ewosure Rate Backcround Typical exposure rate background measurements for this site using a Ludlum Model 19 microR meter are about 15 R/hr measured at 1 m from the surface (i.e., range of 12-18 uR/hr). This value can be measured south of Building 15 (an office building on the eastern portion of the GA site). Measurements taken offsite in 10 different locations over a period of a year also give an average of about 15 R/hr. FINAL SURVEYS PERFORMED Obiectives and Resr>onsibilities The objectives of the Final Survey Plan were (1) to demonstrate that the average surface contamination levels for each survey unit were below the approved release criteria, (2) to demonstrate that the soil sample results were well below GA's approved release criteria for unrestricted use, (3) to show that the exposure rate measurements at all soil sampling locations were less than 10 R/hr above background measured at 1 meter above the surface and on contact with the surface and (4) to show that exposure rate measurements taken throughout this open land area measured at I meter above the surface were less than 10 R/hr above background. Surveys were taken in accordance with an approved survey plan only by qualified Health Physics Technicians having a minimum of three years health physics experience. Soil samples and wipes 2 (100 cm ) were counted in GA's Health Physics Laboratory which maintains an effective QA program. Every survey taken was documented on a daily basis to a worksheet/ drawing showing the approximate locations surveyed / sampled. The documentation included the results of the measurements (including units), the technician's signature, date, instrument (s) used (including the model and serial number of both the ratemeter and detector), calibration due date, % efficiency, background readings (if applicable) and any other pertinent information. Each soil sample collected was properly logged, labeled, packaged and tracked and the sampling locations were documented on a drawing. 6ofil l

f General Atomics Sorrento Valley Central Land Area-Fi71f Radiological Survey Report ] Classification of Area UnagectedAreat The land area designated as "Sorrento Valley Central" was classified as an " unaffected area" because it had never been used for work involving radioactive materials. The northem half of the asphalt-covered parking lot was used to temporarily store radioactive waste l boxes from the SVA Fuel Manufacturing Facility Decommissioning Project. Prior to storage, these radioactive waste boxes were properly packaged, sealed and radiologically surveyed to confirm that exterior contamination levels were well below the release criteria. Final Survey Plan A Final Survey Plan was developed based on the previous history of the SVC land area and adjacent buildings, the radionuclides ofconcem for this area, the potential for contamination, the various types of surfaces encountered and the classification of the area (unaffected). The entire unaffected SVC land area was "gridded"into 3m x 3m squares. The surface area was gridded in order to: (1) facilitate systematic selection of radiological measuring and soil sampling locations,(2) provide a means for referencing a measurement i;ack to a specific location and (3) establish a uniform and distinct identification system. The barizontal (X) axis of the gridwork was delineated by numerical characters and the vertical (Y) axis by alphabetical characters. This established unique grids of easily identifiable entities (see Figure 3 for details). The surveys included a/p scanning of the asphalt (parking lot) surfaces, collection and analyses (by gross alpha / beta counting) of smears, the taking of fixed a and p measurements, exposure rate measurements ( PJhr), and the sampling and isotopic analyses of soil from the landscaped areas. The surveys were completed in accordance with an approved written survey plan. A copy of the j j sutvey plan is provided in the Appendix as follows: " Final Survey Plan for the So Tento Valley l Central Land Area," dated January 26,1999. Soil Samoline Soil samples were taken only from the landscaped areas, not in the asphalt-covered areas. The locations selected took into consideration the proximity of the land area's boundary, potential drainage from other sites, availability of soil and accessibility of the sampling locations. Shallow soil samples were collected to a depth of 15 cm (0-6") using manual equipment (i.e., long handled spade). Each of the soil samples taken was approximately 1 kilogram in mass. The samples were properly logged, labeled, tracked and packaged into plastic bags. All debris (i.e., grass, rocks, sticks, asphalt and foreign objects) was removed from each sample. Each soil sample was individually 7 ofl1 i L

I l I 1 + General Atomics Sorrento Valley Central Land Area-Final Radiological Survey Repon l crushed to reduce large lumps, dried, placed into a tared marrinelli beaker (filled to the top), weighed, scaled and transponed to GA's Health Physics Laboratory. l Soil samples were analyzed in GA's Health Physics Laboratory with a Canberra Low Sensitivity Gamma Spectroscopy MCA System using a high purity Germanium Detector. The system is calibrated using NIST traceable standards and performance checked daily. Soil samples were counted for a minimum of 30 minutes each. A 30 minute count was sufficient to detect the radionuclides ofinterest (Cs-137, Co-60, U-235, U-238 and thorium daughters) at levels well below GA's approved soil release criteria. FINAL SURVEY

SUMMARY

The survey plan for conducting the Final Survey is provided in the Appendix and the results of these surveys are summarized in Tables 5,6A and 68. A comparison of the Site Decommissioning Plan requirements with the Final Survey in relation to the percentage of surface area scanned, number of measurements (i.e., number of fixed radiation 2 measurements and 100 cm wipes), exposure rate measurements (uR/hr), and soil san 5 os taken are i provided as follows: Comparison of Site Decommissioning Plan Requirements with the 1 Final Surveys of the' Unaffected SVC Land Area l# of -

of Exposure Rate
of Soil Samples Survey Scanning Measurements -

Measurements Taken and (fixed and wipes) ( R/hr) Analyzed 2 2 Site 10% of 1 per 50 m 1 per 10 m l Decommissioning surface 213 1064 Not Required 2 Plan Requirements 15% of Final Survey surface 538 1656 40 8 of 11 l l r

f Genera / Atomics Sorrento Valley Central Land Area-Final Radiological Survey Report 8 The total surface area to be released to unrestricted use is ~ 2.63 acres or 114,570 ft2 2 (10,644 m ), 2 Identification of hot-spots or individual locations with activity levels in excess of 75% of the guideline value requires reclassification of the area as "affecte? " No locations exceeding 75% of the guideline value were identified. RESULTS OF THE FINAL SURVEY The results for the Final Survey are provided in Tables 5,6A and 6B and Figures 4 through 11. Scanning. 2 Scans with the 434 cm alpha gas-flow proportional detectors were conducted in the unaffected area parking lot (asphalt surfaces only) in order to identify elevated areas of activity. Areas with elevated readings would then be further investigatea with hand-held a instmments/ detectors to determine if the levels were above the release criteria. All areas that were surveyed disolaved results at or near b_ackcround levels for a activity. The results of these a scans are provided in Table 5 and the approximate locations are shown in Figure 4. 2 Scans with the 434 cm beta gas-flow proportional detectors were conducted in the unaffected area parking lot (asphalt surfaces only) in order to identify elevated areas of activity. Areas with elevated readings would then be further investigated with hand-held p instruments / detectors to determine if the levels were above the release criteria. No areas were discovered that displayed elevated levels of p activity. The results of these p scans are provided in Table 5 and the approximate locations are shown in Figure 5. Fixed Measurements A total of 141 fixed alpha measurements were performed during the Final Survey on the unafTected area parking lot. The measurements were taken using a 50 cm a hand-held detector. 2 One minute counts for fixed alpha activity were taken. The applicable background for the 50 cm 2 alpha detector was subtracted from the survey readings and these readings were converted from cpm 2 to dpm/100 cm using the appropriate count time, the efficiency of the detector and the geometry of the detector. The maximum fixed a result was 139 dpm/100cm for all of the 141 fixed a 2 measurements. The fixed a measurement results are provided in Table 5 and their approximate 9 ofil l

$ Geners/ Atomics Sorrento Valley Central Land Area-Final Radiological Survey Report locations are shown in Figure 6. A total of 131 fixed beta measurements were performed during the Final Survey of the unaffected area parking lot (asphalt surfaces only). These measurements were taken using a 100 cm gas flow 2 proportional detector. One (1) minute fixed p measurements were taken. The applicable background for the 100 cm beta 2 detector was subtracted from the survey readings and these readings were converted from cpm to 2 dpm/100 cm using the appropriate count time, the efficiency of the detector and the geometry of the detector. The maximum fixed p measurement result was < 458 dpm/100 cm (i.e., MDA = 458 2 2 dpm/100 cm, on asphalt). The fixed p measurement results are provided in Table 5 and their approximate locations are shown in Figure 7. Removable Contamination Surveys 2 A total of 266 wipes (100 cm ) were taken during the Final Survey. All of the removable contamination measurements (wipes) were taken on asphalt surfaces in the parking lot, except for 2 four (4) 100 cm wipes that were taken from a metal sewer lid cover. The wipes consisted of using a Whatman Filter Paper (4.7 cm diameter) and wiping an area of 2 2 approximately 100 cm. The wipes were counted in GA's Health Physics Laboratory using a Canberra 2400 low level alpha / beta counting system. The wipe results in dpm/100 cm for both 2 alpha and beta are provided in Table 5 and their approximate locations are shown in Figure 8. The maximum wipe results were 31 dpm/100 cm oc and 13 dpm/100 cm p, well below the thorium 2 2 2 release criteria of 200 dpm/100 cm,. Exposure Rate Measurements A total of 1656 direct radiation exposure rate measurements were taken throughout the SVC land area. A total of 1371 of these measurements were taken at ~ l meter from the surface within each of the 3m x 3m grids. All exposure rate measurement results were less than 10 R/hr above background (i.e., < 25 R/hr). The exposure rate measurement results are provided in Table 5 and their approximate locations and results are shown in Figure 9. During soil sampling 40 exposure rate measurements were taken on contact with the surface at each sampling point. Furthermone,245 of the 3m x 3m grids at the SVC land area's western and eastern boundary were scanned 100% at the surface ( ~ 0-6") with a micro R meter. This represents slightly more than 15% of the total land area that was surface scanned with a micro R rneter. All exposure 10 of11

+ General Atomics Sorrento Valley Central Land Area-Final Radiological Survey Report rate measurement results were less than 10 R/hr above background (i.e., < 25 R/hr). The 245 measurements taken within each grid on contact with the surface are provided in Figure 10. There are 4 PVC drain lines (rainwater runoff) whose outlets flow into the western portion of the SVC Land Area. The outlet channels of these drains were scanned with a Ludlum Model 19 (micro R meter) and the maximum result was 19 R/hr. The interiors of the drains were scanned with the specialized (small diameter) Ludlum 44-62 micro R detector and measurements ranged from 10 R/hr to 15 R/hr. The locations and results of these measurements are provided in Figure 10. Soil Sampling Forty (40) soil samples were taken and analyzed. The gamma spectroscopy results are provided in Table 6A (in pCi/g) for each radionuclide ofconcem and the approximate sampling locations are shown in Figure 11. The results indicate that the values are all at or near background levels and well below the soil release criteria. A total of 40 exposure rate measurements were taken at ~ l meter from the surface of each sampling location and 40 exposure rate measurements were taken on contact with the surface at each sampling location. All exposure rate measurement results were less than 10 R/hr above background at I meter from the surface and on contact with the surface (i.e., < 25 R/hr). The results of exposure rate measurements taken at each of the forty (40) soil sampling locations are provided in Tables 5 and 6B. Before sampling, each of the 40 sampling locations were also scanned with a 15 cm GM pancake 2 detector. All results were s to typical background levels of 40-80 cpm on soil surfaces for this GM pancake detector. CONCLUSION Final contamination and radiation surveys as well as soil sample results provided in this report demonstrate that the area designated as "Sorrento Valley Central Land Area" meets the approved criteria for release to unrestricted use. 11 of il

Table 1: USNRC'S ACCEPTABLE SURFACE CONTAMINATION LEVELS Nuclides* AverageW MaximumW RemovableW 2 8 (dpm/100cm ) (dpm/100 cm ) (dpm/100cm') U-nat,235U,23sU, & associated decay products 5,000 a 15,000 a 1,000 a Transuranics, 226Ra, 22sRa, 23*Th, 22:Th, 23 Pa, 100 300 20 aa7Ac,125g,1291 Th-nat, 232Th, "Sr, 223Ra, 224Ra, 232U,126I, '33, 1,000 3,000 200 I 13ig Beta / gamma emitters (nuclides with decay modes other than alpha emission or 5,000 15,000 1,000 spontaneous fission) except "Sr and other noted above. Where surface contamination by both alpha-and beta / gamma-emitting nuclides exists, the limits a established for alpha-and beta / gamma-emitting nuclides should apply independently. b As used in this table dpm (disintegrations per minute) means the rate of emission by radioactive material as determined by correcting the counts per minute observed by an appropriate detector for background, efficiency and geometric factors associated with the instrumentation. Measurements of average contaminant should not be averaged over more than 1 square meter. c For objos or less surface area, the average should be derived for each such object. d The maximum contamination level applies to an area of not more than 100 cm, 2 The amount of removable radioactive material per 100 cm of surface area should be determined 2 e by wiping that area with dry filter or soft absorbent paper, applying moderate pressure, and assessing the amount of radioactive material on the wipe with an appropriate instrument of known efficiency. When removable contamination on objects ofless surface area is determined, then pertinent levels should be reduced proportionally and the entire surface should be wiped. f The average and maximum radiation levels associated with surface contamination resulting from beta-gamma emitters should not exceed 0.2 mrad /hr at I cm and 1.0 mrad /hr at I cm, 2 2 respectively, measured through not more than 7 milligrams per square centimeter of total abserber. T-1

Table 2: STATE OF CA ACCEPTABLE SURFACE CONTAMINATION LEVELS 8 b b b Nuclides* Average *' 51aximum d Removable *' 2 2 2 (dpm/100cm ) (dpm/100cm ) (dpm/100cm ) U-nat, 235 g, 23 U, & associated decay products 5,000 15,000 1,000 Transuranics,226Ra, 22sRa, 23 Th, 22sTh, 23 Pa, 100 300 20 227Ac, 251,1291 Th-nat, 232Th, "Sr, 223Ra, 224Ra, 232U, i26g, i331, 1,000 3,000 200 i3g Beta / gamma emitters (nuclides with decay modes other than alpha emission or 5,000 15,000 1,000 spontaneous fission) except "Sr and other noted above Where surface contamination by both alpha-and beta / gamma-emitting nuclides exists, the limits established for a alpha-and beta / gamma-emitting nuclides should apply independently, b As used in this table dpm (disintegrations per minute) means the rate of emission by radioactive material as determined by correcting the counts per minute observed by an appropriate detector for background, efficiency and geometric factors associated with the instrumentation. Measurements of average contaminant should not be averaged over more than I square meter. For objects of c less surface area, the average should be derived for each such object. d The maximum contamination level applies to an area of not more than 100 cm, 2 The amount of removable radioactive material per 100 cm of surface area should be determined by wiping that 2 e area with dry filter or soft absorbent paper, applying moderate pressure, and assessing the amount of radioactive material on the wipe with an appropriate instrument of known efficiency. When removable contamination on objects ofless surface area is determined, then pertinent levels should be reduced proponionally and the entire surface should be wiped. f The average and maximum radiation levels associated with surface contamination resulting from beta-gamma emitters should not exceed 0.2 mrad /hr at I cm and 1.0 mrad /hr at I cm, respectively, measured through not 2 2 more than 7 milligrams per square centimeter of total absorber. Guidelines For Decontamination of Facilities and Equipment Prior to Release for Unrestricted Use or Termination of Licenses for Byproduct, Source, or Special Nuclear Material, also known as "Decon-1" incorporated into GA's State of CA Radioactive Materials License. T-2 l

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Table 4: Background Measurements (Obtained from Building 13) Ludlum Model 2221 Ratemeter s/n 86332 with Model 43-68 Probe s/n 142540 2 100 cm Beta Detector (Efficiency =28.80% ). Background Material Average of10 Measurements MDA 2 1 minute each (cpm

20)

(dpm/100 cm ) Asphalt 772

40 458 Ludlum Model 3 s/n 138880 with Model 44-9 Probe s/n 145963 2

15 cm Beta / Gamma Detector (Efficiency = 22.05%) Background Material Beta / Gamma Scan Range (cpm) Asphalt 120-140 Soil 40-80 l Metal 80-100 Ludlum Model 2221 Ratemeter s/n 148445 with Model 43-37 Probe s/n 147966 AlphiFloorMonitor Ba~ckground SeatrResultsr434'enP Detector-(Ef!Iclency = 21:33%)- Background Material Alpha Scan Range (cpm) Asphalt 0-32 Ludlum Model 2221 Ratemeter s/n 86302 with Model 43-37 Probe s/n 086215 Beta Fr.oor Monitor Background Scan Results: 434 cm Detector (Efficiency = 21.85%) 2 Background Material Beta / Gamma Sean Range (cpm) Asphalt 1261-2530 I I I L T-5

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i Table 6B: Exp sure Rate Measurements taken et S:ll Sampling Locations - SVC Land Area 8'2 l l Sample ID pR/hr (Location) on the surface-at 1 meter SVC-1 14 15 SVC-2 16 15 l SVC-3 16 15 SVC-4 17 17 SVC-5 17 17 SVC-6 15 15 SVC-7 16 16 SVC-8 17 18 SVC-9 17 18 SVC-10 17 17 SVC-11 17 17 SVC-12 17 17 SVC-13 16 15 SVC-14 16 15 j SvC-15 16 15 SVC-16 14 14 SVC-17 15 15 SVC-18 15 15 SVC-19 15 15 SVC-20 17 16 SVC-21 17 17 SVC-22 15 15 SVC-23 15 15 SVC-24 15 15 SVC-25 14 14 SVC-26 15 15 T-11

~ Ttble C: Exp;sure Rate Mecsurennnts taken at S:ll Sampling Locations - SVC Land Area 8'2 Sample ID pR/hr (Location) on the surface at 1 meter SVC-27 14 14 SVC-28 16 15 SVC-29 15 15 SVC-30 15 15 SVC-31 14 14 SVC-32 15 15 SVC-33 14 14 SVC-34 13 12 SVC-35 13 13 SVC-36 13 13 SVC-37 13 13 SVC-38 13 13 SVC-39 13 13 SVC-40 13 13 AVERAGE 15 15 l ' Before sampling, each of the 40 sampling locations were scanned with a 15 cm GM pancake 2 detector. All results were s typical background levels of 40-80 cpm for soil. 2 Exposure Rate Measurement locations are provided in Figure 11. T-12

Table 7: Background Soil Sample Results ' Radionuclide Concentrations (pCi/g) Sample Th-228 Ra-228 Total Cs-137 U-238 U-235 II)2 Average of (Th-232) Thorium 238/583 kev Average of Th-228 + 661 kev 92.77 kev peak 186 (144) kev peaka 338/911 kev peaks Th-232 peak Peak AJ 1.28

0.07 1.47
0.14 2.75 ND 1.98 0.31 0.15
0.03 G2 0.92
0.07 1.01
0.12 1.93 0.12
0.03 1.86 i 0.29 0.12
0.02 I

AC 1.29

0.07 1.34
0.14 2.63 ND 2.27
0.27 0.20 0.03 BKG-1 1.40
0.16 1.44
0.28 2.84 ND 2.06
0.48 0.19
0.06 i

BKG-2 1.54

0.15 1.57
0.27 3.11 ND 2.30
0.45 0.17
0.05 BKG-3 1.40
0.14 1.62
0.26 3.02 ND ND 0.19 i 0.05 i

BKG-4 0.67

0.09 0.84
0.17 1.51 ND 1.15
0.37 0.09
0.04 BKG-5 1.51
0.16 1.79
0.31 3.30 ND 2.77
0.67 0.12
0.06 BKG-6 0.68
0.09 0.76
0.16 1.44 ND ND 0.08
0.03 BKG-7 1.17
0.12 1.28 0.22 2.45 ND 1.83
0.43 0.11
0.04 Mmeeo 1.19 0.64 1.31
0.68 2.5
1.32 2.03
0.93 0.14
0.09 Samples gamma scanned for 1 hour.

ND = < 0.1 pCi/g for Cs-137, < l.0 pCi/g for U-238 2 Samples collected in.'une and August 1993, typically about 1-2 miles from the Building 37 site at the following locations: AJ Collected on a hillside west of Building 39 & northwest of building 37, ~3' from GA's fence. G2 Collected about 1200 feet west of Bldg I (near Torrey Pines Road), and ~7/8 of a mile southwest of Building 37. AC Collected about I mile southeast of the mam site & about 2 miles southeast of Building 37. DKG-1 Collected about I mile from Building 37 at the Scripps Hospital Entrance, cast of Genesee Ave. BKG-2 Collected about 1.2 miles from Building 37 at Sorrento Court Rd. by the North entrance to Post Office. BKG-3 Collected about 1.5 miles from Building 37 at Sorrento Vista Parkway near Lusk Blvd. South. BKG-4 Collected about I mile west from Building 37, west of Genesee corner of North Torrey Pines Road and Torrey Pines Scenic Drive. DKG-5 Collected about 2 miles west of GA off of La Jolla Shores Drive. DKG-6 Collected about 2 miles northwest of Building 37 on North Torrey Pines Road. DKG-7 Collected about 2 miles near V.A. Hospital on La Jolla Village Drive (southwest). T-13

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r \\ Figure 3: Diagram of Sorrento Valley Cantral Land Area ! ! i I 2 ; 3 5 4 { 5 l 6'; 7 i 8 ! 9 i101112 !1314 I15!16;171819!20'21i22'23!24 25 26$27 28.29 30.3132 33 I .1.i t a 3 .a j i ! i ; i i ! i lmsees&i.pg jggg;gg gggggf.pgy gg l conum. won a stars Rid o A pfip.%) Eastern Portion of Building 37 South E.,yo 1 t.

3 '.

..s B ... m,n m - -W ,m,.w:w v. r,,..m.,,...,

n.,

s -4 1 -4 .I C: g ) stairs ' ' ; - ; e Loading Dock ' pd ' g D I YI I# ~I ~ ' I-Stairs 1 El (.. ]E / (,J l f. ,/, ,-..t. g, g,,,,/ y 'andsc' aped !

5. o,

!;7 k,,,, g,g - o L t y 1 . Areas PARKING LOT-H l l i : J< ( 4 -t-1 ( y . K .s i 1 L ~ i t - i - PARKING LOT i-Mi. i t i 4 .2, ( N a, I ($Q h .f. ) k .N: s . 4 ! 4 ,... i. O ;' i i 4. 4 4 F R-l,- . PARKING LOT.. i,

1 1

1 I i.; S :' i 4 La'ndscaped - L i ~ 4 T.j j _ L i l Areas.. f. ' ; ! .! i [,~ Ui ' i i ! 4 )'. l Landscaped Areas 1 77 e. ..' nside &'outsic'e of fence) i ( -g J .s.,.

i h\\/ i l ! ' l l l l i

i i w' 1 p; t-.. 4 i-4 i g-4 Xi ecurityl g[g' ' h.. S,..

Propeh, 1

! I - t ._y l ' _' l F i Z i !. vp y,. Boundard 3.-.. a +. AA! t ( i ) 4 4 BB.l l l i, =. *. 1-+ + CCl =r 1 i i .9.. ..._5...9.. DD! .... i. r: j !, 4 1 ! 2l 3; 4 l 5 ; 6i 7 ; 8; 9 ;10 l 1112 13;14:1516. ?718 ;19 20 21:22 23 24 25 26 27 : 28 29 30.31 32 33 i t i Notes.

1. The surface of the parking lot is paved with asphs

2. Exposed soilis found only within the landscaped 6

~ _

i w A S4 >N v E 35l36l37 38 39 40 I 41 42 43 44 45 46 47'48'49 50iS1:52 53 54}55 )?.57 58 59 60 61 62 63 64 65 66 67 l ySorrznto Valley Central, . Land Area Boun,dary j l Sorrento Valley Central A Lan.d Area Boundary ~ B Loading Dock 1 C i 4 s Y mete. D s2 -i . O y unod evc cuivert. 8 J, $d .E F Capped Sewer ' - PARKING LOT une N O. G

)

sliding 4 7-[Ab / + .V security V J/ ' \\l Landscapedt Gate for 'K / B'd 39 PARKING LOT. rL - Areas : M + N w' _a x a + ../.'y. A :f3' 'O: ;O O 5) .O 4

p 1.,.,

.O - i. .R J, -.,= S f.q, L, g, d d . Property,

..,,,a.

v Fince .u Boundary . ;T gh_ q~ /' p r? e ,,1 g 1 4-p4 t. .l % AiZ /wi; AJ CD 4 l ' ' a .- l f-4 I. ,W r e.- %t I t i i i ..,, X 2. +.., " 3 " 8 '"*.' o* Y i 1 5 Z -4 p. i ..,, i I lAA .i r r-4 i .' BB - F -- i 4 i

CC i

1. . i 1 m L, . +. y 1DD 3 + 1 , i 35 36:37:38 39:40:41!42:43 44 45'46 47.48 49 50 51 52 53;54 55 56 57 58 59 60 61 62 63 64 65 66 67 l8S., j =

I w Lp i i u L Figure 4: Alpha Scan Locations and Results. l 1 l 2 { 3 ! 4 ! 5 6i 7 i 8 i 9 !10!11!12l13!14 l1516l1718.19;20 2122 23 24 25 26 27 28 29 30 3132 33 ? l a p 'ii! l. la @ y u w sp; @gep ;ha :.f /m t i m ,.c.

q wc, ow ?

A ;' gi, - 'd Eastern Portion of Building 37 South I 4 B ', 1, . a + . v:3 g mmer;x e +-< ~~ ~ T: - gb, 4.... 4 C i i > -- q 1- -4 sg t-4

=

Ei 2, .(' /_\\\\ .i." 30 4.g F< e, 5 20 mm

30 : 30.

D'. .+. 520 chm 9I [,

40 J

H,4 5, l 5 20 cpm e 4 5 20 cpm. 2,304 l l-4 s 20. cpm >{ 4 s 20 mm.*{

t J

Kf < 20 cpm p _ j k,, .f 5 20 cpm a I4 5 20 cpm ,.l N I < 20 cpm 4 . ;s 2pppm> j E 3)45 20 cpm *( .N j P. 4 + = 20 cp.m -* R _. 5 20 cpm n 5 20 cpm .g, 4 5,20 cpm. ... i.. S 5 20 cpm ; q T ..l 5 29 cpm . I..,. U'.; ~ s 20' cpm. V . 652p i l .--i -5 20 cpm. h 2g epm, .,?J % * " _..,, -.,_ .2.A. s., W 5 <.20 c.pm. m 3 u Y - <20 cpm 5 2p m r Z, [{ ]~ 2[cpmM0) ~- b AA: N l s 20j 2b f., BB I t 4 l ', CC y w DD: 7 . = 4 i,, 1: 2 l 3 ! 4 ! 5 l 6 I 7 ! 8 ! 9 10 ! 1112 : 13:14 '15,16 17 -18 19 20 21 22 23 24 '25 26 27 28 29 30 31. 32 33 { Notes. ]

1. Survey results are provided in Table 5.

a

2. Alpha scans are depicted as shown. All a scans were 5 20 cpm except as d l

} l y%

3. Alpha scans (434 cm detechr) were conducted at one probe width across(

2 i r,.

4. All surfaces surveyed we.., overlaid with asphalt, i

ll N f1 1! e. m

o -.-- -e W A S 4h,h> N E [35 36: 37!38:39 40;41!42,43,44'45'46;47;48,.49 50.5152,53 54 ' 55tS6 57 58 59 60'6162 63 64 65,.66 67 , -- i 1 1 4 3 -. i l r I i. i j t "* 20 l -f-1. k. i i t l f-a i t t. 4 s e r i ! T l i 5 20 cpm ' j-A

l 4

,. i e, ,.. t 4 20 cpm g B 1 4 2 s 4 l

. i f

,20 -).C t i ..p 2 9 4 i ..0 D <2 ,t 4 ,, i., n. , i \\;E .J < 20 ,520 cpm, . l., ,M,4 5 20_ cpm-+ l' G ?, < 20 '. I e, r_ ,.,.1.- ' i ' 5 20 cpm ~ 4 4 3 , 5 20 cpm, '4 H 5 20 cpm t c-0,/ i 520 cpm; <2 J m,...,.4.. 1 . :;/ K < 20. cpm. ., _ i-4

..C.,

20 cpm i -i..: L [ ! O C,..' e.,,,. - - ., 20 cpm, ~ I 20s,,,,,, *- @* '5 M

C...'.

+ ,..... 20 chm, N + J 4 5 20 cpm ->[ j 3! ! .O /

P.

5,20 cpm , _.,,...20 s,j,' . _1 _ _, i 1 i i 4

$ 29 v ' gi.5. m

, + i l

g.

33 .,---r g /* # @3 d' i i 1 - 4 4 q. .. a.i 4.. .! 3 c. y.... )_. . 5 20..-- f. i a. .L r 4. 4 i i ' 1 +Ig2,Q. r* a 5 20 '.,,'. ;;.. r i ; i ; t l j i !. ! ! ' . a.T. 4. u, 4 ....4 ,U Also Avaliable on a. l .,. l ! I 3 x s tre,er grh, i.. .,a ','. _ } _,i !.i I ,!y Aperture Card l i .L

i 4

_t 7 ,i . !.. 1 J !,. ..,,,, + o ,i i ,.W i , r __+...4.. } i j i l I f ,' X p. 5 .4. .c 2 ,,. i. , + i i ! i ,,t. 1. 4 -.Y ,. i 4 , 3 e a i i i Z . [.. ) l ! , d.-. 4 j 4 4 AA i ..,c. 4 4 ! I ; . 1, .i i 2 .;4 ~ i. , BB 4 4 -.i.. - L 4 i. l. I,;,..!..

CC

+ i = r t .t r 4 1 ! i =. - -.. 4 l DD i 35'36i37i38 39 40;41l42'43 44 45:46l47:48.49 50.51iS2 53;54l55'56157 58 ;59 ;60 61 t 62 63:64;65 66 67 ) dicat2d in bold type. All results are in cpm. e 3m x 3m grids. The area scanned was - 15% of each 3m x 3m grid. ~~~~ l \\ i l 1 i .. i

bw ---- l>.. 3 I 1 Figure 5: Beta Scan Locations and Results. 1 : 2 ' 3 ! 4 1 5 ' 6 i 7 I 8 ;9,10:11'12:13 14:15.16i17'18: 19 20 21 22 23 24 25 26 27 28 29 30 31 32'33 ,! - j- ' t t i : ' l;%N$$Mb;ty.gNf:pgr.,j:p % 47 + 5 A'I i r i Eastern Portion of Building 37 South b l a B' i l l I " " ' ~ " ~ " ~ ~ ~ ' ~ ~ " ~ ' ~ ~ ~ '~

i.,

C, .4 r i " D I 222_ i .V. .(., E, i = / Ib, [,'ik00ho1900 cpm F l G.:-- l, .. to 1900 cpm 1700 +- W H,l 4 1600 to 1900 cpm i l ( c 4 7 (. W}. . 1 .4 J I ' " g, ~

1500 to 1700 cpm "K

Y I E I: 1500 to 1700 cpm 88-88: b, 1500 to 1700 cpm

g g, g g j

., } N( [ E,* M!. c N

y $. @. @.*

, _ ; 1500 to 1700 cpm l ~; 1400 to 1600 cpm h -i f + g +., Q!, e ..\\ 16,00 to 1900, cpm. F -... e + R' ,~... -. 1600 to 1900 cpm-4 4- .y- . i T i, ~ l '.., e,. 4 . -, -..", ~.1600,to 1805. 'eph. '~i I 1900( Uj i '4 1600,to 1800. _ cpm 1 u,niu,u. 4-- 1900 to 2000, c. pd ..,.4 4 _c 4-VI i i : l '1600 to,190,0 cpm ; 4-2100 to 2300 cpm. g-4. <, l W l p;. ,1600 to 1900 c, pm w. _4 Xl .!...t , 16001o 1900. cpm .s. _. 1 1-Yi 1600 to, 19,00 c. pm,.jA.. a .. y _,!. ,,4 Z. I ....d'.. . j,, h[Y,.,,-h., t 4 . 9 e , - q.,. A BB! T. 7 _CC l, . - i 4 a 4 ..l DD ! ~, :

i

.a 1l 2: 3! 4! 5 6 - 7 l B i 9 l 10 11 12 13 1415 16-17 18 19 20 2122. 23 24 25 26 27 28 29 30 3132 1 i',( Notes:

1. Survey results are provided in Table 5.

, 1

2. Beta scans are depicted as shown. All results are in cpm.

i

3. Beta scans (434 crn detector) were conducted at one probe width acro (

2

4. All surfaces surveyed were overlaid with asphalt.

~ W n S4 >N u Y 235 36!37 38 39 40 41 42,43.!44 45i46,!47,:48,49,:50,513!52 53 54'55 56,57,58,59' 60 61,62 63 64 65 66 67-t i 4-n i-o! ' l !.! ; l .~l l l l f '.4 3 .f i r,.~- ~ > ;:; ] ; { 4 l

i i

.w ? i l e i i 1 i.I 4 t i i f 7 f l

o 6. ),

B i .e gu. .i, ; i w: i i t i j .n .( C 4 t - j..; , +. w ,8 i -} i l 3 e r t .D 1 4-i i i )., E = 4-- 1900 to 220,0 c.pm ,). ' , 1700 to 2100 cpm. p 3 I, i 1700 to 2000 cpm, , -+ c 1900 to 2200 cpm ig 1600 to 1900, cpm ,1900 to, 2100 cpm. 1 i . r -,'. 4----1900,to 2200 cpm 1600 to 1900 com ) 4 , - + i: 1900 to 2100 cpm ,j/ , uw !v ow 7-1700 t.o 20,00 cpm 0 ~ ~ 900 to 2100 cpm

l K 1

1700 to 2000, cpm. 4 1900 to 21,00. cpm 1 c 1800 to 2100 cpm

4--1800 to 2100 cpm--+; - y f 700 to'2150 cpm b +--1900 to 2000 cpmh...M '

N, . -.-, M N. a. .a 4 s' ,= .Q p+1900 to 2000-*,7,. ; '_O 3i ! - cprn. -> / ' i 1800 to 2200 c, pm. P, 1900 to 22,00. cpm L. ~ a # ' /.. i O ,... a j 4 '1800 to 21,00.c,pm' .' y - + y900 top 100 cpm, I' 4 -*I

+

+ ' i I R o q -t 1-p - - + - 0 --. S, ,,, ? t 4 y; 3 a i M._,m*'"' -........ r,. t,,..... L i .O. hngh M i ! ) ~ ' i j l .i I ^ j ! j i = 3 x 3 meter 0 red ,l I l l y 1 ,i.,. l i r,t.. i i -1 7 m ! I l l. l ! . I. !. i ! n - + .+ + i. 4 -. -.W Also hvLhtm0 0n 1 CCrd e 4 _-r. a_ 4 l 1 ' ! i _,I.. _ ' +:,' ..o .!. 4 l i , -,Y y i ! i i ,l i.; _ i

i

. l 4,'. 4 Z 0,.-.,' 4 .i ! ; ! - t. .s 4 -s AA I e 4 t 3 ; t 4 i BB .;. q ,4 j.. .i_.,. -,2 i r..i... : i I i .' ; t..a. l C,.C e 4 .i, .., i i. .e 1, +; i l - DD

i p35 36. 37 38 39,40.41 42 43 44'45!.46'47,48 49 50 51 52: 53 54;55 56 57.58 59 60 61 62 63 64 65 66 67, a.

4-4 + , p J z i

i.,

the 3m x 3m grids. The area scanned was - 15% of each 3m x 3m grid.

F, L Figure 6: Fixed Alpha Measurement Locations and Results. f i 4 i 1,2.!3l4 5 i.6 ; 7 { 8 l 9 1011!12;13 :14 ;15i16;17.1819i20!2122 23 24 25 26'27 28 29 30 31:32 33 I 1 4-q I ! ~I lW;WN80NMQ@36YdfidMSMEastern Portion ~ i W-d,k.W ~ A'I'i . : j i l l 1 ! 5Nb.

wrc.<vnm qwwncw rz

' m mm: l1 + ! -

- + ' -

B>; i !. !..' _ 1, t l ..C J 4..,. ., 4.. ~ D ! I !.) k,,' }\\ ^ I

=

1 1 - E ; p,,, ' F,: 113e 5139 5138 5139 4 G; - i ,5139 .i 5139 <139 <139 . -.. + i-Hi .-213'. I t sise ; 513e 5139 s o a t 3 a l ; gj 3g, <139 <139 <139 5139 ....i. 1 J; i .4 4.. 3139 5139 113e 11 w K, 5138 p 5138 ! 5139 513e . ~, L.l ' 1 t l 5139 1 39 . +,. 5,139 3139 g 7 j; Mi 1399 5138 5139 sise 513e t.,,., '~ Ni e <139 s' '5139 5119 513e <139 . y r, (; 2 Oi r i ! 213e > p. .......a 3139 s s .,....a _ ? - .. ( . F1 P' ~ 38 - <1 = t 3e, .l q 4 T 3139 4 3139.... .p Q 5139

139 I

3139 i 4 i, 5139 i i ,,q-f- R <138 513e ,sise 3139 4 l. ~... 4 4 ~ s13e U .-S 4.. 3, :30 313e 5, i39 T. 5139 4 r.. st39 51r8 s .. 4 ... 3..!.. ; ' i t i ! :513e ; ,...m.. J.. .4... _..,. U> .4 l j '5138..; ! ' .i,. + - + i i 5139 l 5139 5139; V 513e !,4 4 e ' 5138.' ' <13e 513 .c i 5139 q .e. 7 + +, 4 u.,! i ~ W i ,513$ 3j;j -.w -.x-.

siso

.' 1,,,,, + p. , 4 5139 i X- <ise i i T -,

7. 9 7,'

13 i ..#i e-a Y

313e !

,1138 i S-. i, ....4 ,..f Z <13e .4 4 ., -~

l.... y _,

I".. ;i AA! j 5138, i I BB ' 4

Q+

i. . + 4 i . CC; l ...,i r DDl i j. 7...- + t 1 2' 3i 4: S i 6l 7 j 8l 9 ;10 ; 1112i1314:1516 ;17.18'19 '20 2122 23 :24 25 26 27 28 29 30 31 32 33 $ Notes:

1. Survey results are provided in Table 5,

2. Results of Fixed Alpha Measurements

3. All results were 5139 dpm/100 cm, p 2

4. All surfaces surveyed were overlaid wlC i

MN W.C W

7-W %4 ? E ) 35 36 37 30 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 j ~%\\ 1 $13951 9 A 5139 513j B l 5139 .g. C 5139 D ] 113 % A\\ E k_p I 5130 g139 5139 $139 5139 5139 1139 5139 .. \\G ] E139 1139 1139 5139 H 5139 1139 513g $139 V si j ,,,) 1' 9 n 1,,, 5139 5139 5139 5139 'K 1139

139
139 5139 5139. J[

5139 1139 5139 M /. 5139 1139 <139 5139 Ib' 'N - ,s-N yne sua .) O r, q 3139 st39 5139 p %f

,*~

O l~tlA h [ a ll,AQ & r,9, sty; 3133.' S y T g,e, .u an ret V W X Y Z g. 3 3_,e o I. BB h cc DD 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 sken within the 3m x 3m grids are shown in locations above. 2 2 ie MDA of the 50 cm a detector used = 121 dpm/100 cm, i csph:lt. r / /

m-i i ef Figure 7: Fix:d Beta MemurimInt Locati::ns cnd R: cults. n LI 4 ~ i ! i1 2 l 3 r 4 l 5 l 6 ! 7 l 8 i 9 l 10 11! 12 13 1415'16! 17 18 19'20 21 22 23 24 25 26 27 28 29 30 31 32 33

i

,1 A + liMihMWG@@, +W .M. W,M~.,.Esgf ?. m. r, J.. r i ! 3 ,i L g A; l i rg Eastern Portion of Building 37 South y, i B, d,v m mem77~nn-ws rnm.n i 1, i i i > -r i. t + i. e i i ! a C; i ; l i i j

1...

3 1 j D. . + 4-4 .. i 4 4

=

4 j 4 6 / _.( El ^ i 4. j i .i Fi use use use use oss i i Ms8 r 4 4 4 J G.l ' 1 <4ss use use 458 + e. -4 1 3 4 H! 4 use . + 4 +. a4se oss use

1 i

1 i i 445g-k4s8 l i <4s <4s8 3 i + .,j 1 4 { -. J. A <4sa 438 y 3, ,_ use y <4s4 i K + use

ose use "s

use l <450 l t <458 uS8 <458 i .i M t . nse use usa 4 oss N, use : oss use usa usa use -6 -._ j,. - g. g ~ 4 58 f, [g) <4se us 7 Qj { 44s8 4s8 ~ 44s8 4se R 4 58 ! ., i ... i i t i use. ! ' use usa use +. +. -t S. <4sa r. p use use os8 T ;,. 7 1 U}'

I.

- use ' use usa use +_ ,, + 2 i ! ! use use ' use,. . %se use j.... '! 9 ._a.. +,,. .a.. 4 4 .y Vj ,1 <4se i a4sa ~ use i l <4sa 3 i ,k.,,,,.,- -- i t 4 ,.a W, i ; 4 58. + - +.. i4se !,' "se use ..e..,. .y_..,_-.n~x,,,,, s. s i y +. <, -, X' .i use i - < i 6 t-- 1 4 Y i i i use l 4 - >. l,_ m ; _- a

- r..

q Z 1 t 4 -r ; AA. 1 N

;r, g..

p BB. cc! l '..d. .4 DD-j t 1 i i. . i. . > ~.. j 1! 2; 3! 4l 5 6l 7 8l 9 ! 1011 1213141516l 17.1819 20 2122 23 24 25 26 27 28 29 30 3132 33 34 3 Notes. d

1. Survey results are provided in Table 5.

"1

2. Results of one minute Fixed Beta Measure

3. The MDA of the 100 cm p detector used = c 2

li

4. All surfaces surveyed were overlaid with asy l

l

W h h>N S4H u E d38l39.:40 41!42'43!44'45: 1 i.,.,, .p.t. i. 47. 48 49, 50 5152' 53' 54 55 56 57,. 58 59 60 6162 63 64 65,,.66 67 46 o... a '

4 yc 4

-..m m 4.., . p - I I .r j l I 1 l l j i i { ,r. 4 + ; , :.!p -,. h' 3. p, <..i I i I I l l - i 4 4 i. .j l [. .L ' (:

j 4 58 I,A 4

..y ....,.p j 1 '. j .4 s 4 1 4 e! 4 58 ) ,B i. 4 r. .. ~., p 4 7 i i ! ! :

I j

,,.. i,,i. i 4. ; 4 t i i i { ;C 44 ri, -<.y 4_ ~ .' ' : t .!.;,l .. i. i .1 !D -4 -y..,..i. t.... 3 9..p.e i ' 4 .\\ i i ! i i i ; f f, g.E i 4 l ! ! l <458 .I l A458 , i i l 4 58 4,p -i o,, -.. m. , _,,. r ), 4 j c453 i ! l ' E458, ' <458 l i ge458. <458 .--i.' ..i G .j.

-J 4

.a y 7 4 '<454 l,i l 4 <458 ' !

i

.1 4 ... - 4 i l =458 i , 4 58 tH t D- .t 4 .J. <458

4458, q

e458 t 1 1 i .T t s 1 ) + + . i -t j 9 ? l j -, q$g ' 4.

J/

j ..c . !. r A456, c456 <450 c458 .. <4 58 _.,. L i. 3 4 4 , i I E456 ) <458 ( .i. /. K ,,j -. -4 ,j tp, q. -g

a438

) i I <458 j i i e458 <456 gL i .p-i .o ,.;. ; p; 9 a 4 a. ,. t s 3 p. l 4 58 ! j j <458 y

' p, -.-

J a -,. ,. 3 4 g. p. . i ,,. -,f t

$450

<450 i I ',{ -. 45( <458 N i c456 e .s t.. r - - s. _. s 4 M,,,,' '"~ '4 56 ig... - - 4 . t fi 4 ,4

O_

1 j <458 j ; /; j

=458 i

i i 5458 i y., ; p.. e 2 a. 4 ~4 { 4_p., ,. l.. _.. q q - y ;! ,j..; 4. i .4 ! [ 4 58 i ! l ! j F454. h; et ,'_..q ) { .1 _ o.',i. -, ' :g l m.. -,. a.i. ;.: # r

a. 4 1 7,

r. 2 l

t,,,

d ' '

ll I I l <458 .! ;R ,a.+.p.4. gl 2 1 7, .j_ y i ., _.a i < i 1 4 4 2 a.. p. a.. - g+4 4 # . i 2 n'd' ( f y, cQ M. a,), u5e ,e

j.,, h, m.,

,..2... _...,""-l,_ .4 ~ 4... .. [. .[.. [ j..- 4.... _.. y[ f [ 3,. l i l U_. gg w g g L'd5[,,,i..A y..F"I '[.4.! r l1 L7 .. q.... _.a T. . i i . _ i _ p,. p... j. ..-..i .4. 4__i...l 4 _i....s: - e. i i i : 1 n t _.4..r.. .e-. ~ g ,!, M _ . Q; i M:! 1 Ql j. l i _ $ _ansm._p i 1. p.44j_[ } 4 p V-Also Ayahtitde on L. 4 3 +' ar ono f i - ! t ; i I i : ; ; : ; 'W A~dn.4t%ure Card l. -....f. g.....4 .6_.. ..e _..g Q ....g., ,-,.....<g 4..,,. -.9.- 9 .....m_.,..,,.._.4.... ..4 l .i ii....}. 6 i. .L.4.. [. t I l [ I f ~ l _4 . j. ...i.... i _.1, i _ i.eX j i i ,. q.. : . p., p _t i I a! 4....l.....n! q.'_ ! i .3 4 4'...n.i .l I.4 iY._ i i

q.

f .l '.. i t-l l i t i

i

. !. y: .i..- -,,.. e, ..Z l [,.._,..i !y i. ! : .s r . +. p o a__... ,4__ i ; 8 ( f j l - l i .,... ',i jAA .l. 4 q! q. ,,.... r. e q.e .v_e 4 l l l ~, l '.. l -. - o _,.. - l '

!. i ! !

I ; i

BB I-r d l

i

i.. r

-,I.,I.. i..! _.,!. ",- r +- " ~ ' - - ~ > - + + I ! .. !.._*,l.-. r, m !l I..i.. _. p. m,.. I.. i._ .4, _ icc 4 4- ,. _ a 4 I j i ..... n_, -.,i _ u! l i l l { ! ! j l I i i !. _ 4 ( i , (

i

' lDD .. ag _, ..-+4 4 ".38,39,40 41 42 43'44 45,.46 47. 48 49 50 51, 52 53 54, 55 56 57 58 59 60, 61 62 63 64, 65 66 67 8 1 A' I-y r# ,/ tak n within the 3m x 3m gridsare shown in locations above. 2

rn/100cm (on asphalt) All results were < 458 dpm/100cm2, i--.

u

.s !I ll; 1.J l l [. l l Figure 8: Removable Contamination Locations, ir. J 1 $ :3 :4 5,6.789 10 :11 12.13,14 15 16.17.18 19'20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 5 ? l l li(GibikViB]%?Tfi kjg}\\ff[&};),p j % ?q.> f'yy + A l @gp,Ig Eastern Portion of Building 37 South !. e

. i w ememm*vc -

m c ] D I ! I ' ~l~ ! [', l'f EEE i 'l L I i' E'! / l k! EEE / n: ! T ; @^ L t, g ~ T@hh [D @;'- @' 9:f G'! '. &@... @. ; 9@ h, H

p. @. %

g 1[

1., i.

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1. Survey results are provk l

2. All surfaces wiped wer@;

3. @ = Approximate lod r --

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r t Figure 9: Exposure Rate Measurement Locations and Results. +, 1 2'3-4 5 6 7 8'9 10 1112 13141516 17 1819 20 212223 2425 2627 282930 3132 3334353 k 16l,m

73: g y rg, 4

' ; M Eastern Portion of Building 37 South ! A 17 :18 17 16 1615 16l17 17 17 18 18 - 18 18 y_ A B, 17 18 18 17 17 17.16 16 17 18 17 18 18 18 16 y y m -,;;- p 4 C 18 18 19 19 18 18 17 17 17 17 17 17 18 18 17 16 16 16 16 17 16 16 17 16 16 16 17 17 17 18 17 17 14 D 18 19 19 18 18 17 17 17 r 17 17 17 18 17 15 15 16 16 15 15 15 15 15 15 16 16 16 M 15 15 16 14 x , {, E 2 18 in 18 18 18 1818 ' 17' 17Y 18 18 % 18 ' 151515 15 15 15 '15 '15 '15 1616n'a 18 18'17) 17 (16'17 16 F 20,19 19 18 18 18 18,17'17 17.17 17 17 17 17,17 17.16 16 16 16 15 15 15 15 15 15 17 17 18 17 18 18 17 17 17 1 [ G 19 19l 18 18 17 18 17.17 17 17 17 17 17 17 17 16 15 16 16 16 16 15 15 16 16 18 19 19 19 19 19 17 17 18 18 1) A-H 419 18.19.18 17 18 17 18 17 18 17 17 17 17 17 17 17 17 17 17 17 16 16 16 16 17 18 19 19 18 19 17 17 17 18 1 l j^ 19 18 18 18.18 449-46448--48-484&--48-4647 17 - 15 P 17 17 P 17 15 17 '9 20 19 20 17 16 16 17 16 16 1e 1818 18 1h 17 17 in 1716 1 J 19 19 19 18 18 17 17.19 18.18.18 18.17 17 17.17 17.17.17 17 17 17 17 1 18 1 '~ K 20 20 1918171718 17171717171717171717 1717171717171 18 81819191818171717161! 19'19 19'17'18 17 17 17'17I17 17'18'17 17 17 16 16'16 16'16'16 18'18 18 18 18 18 18 17 17'17 17 17'1 L 20 g f; 19 19 19 19 17 17 17 16 17 16 16 16 17: 17 16 16 16 16 16 15 15 16 17 19 19 19 18 17 17 17 17 17 18 17 if M 20 N 20 19 21.20 17 17 18 18 18 18 18 17 17 18 18 18 17 17 17 17 17 17 17 17 18 18 18 19 19 18 17 17 17 17 17 1

20) 9 21 20 18,

,18 18 17.17.17,17,17.17,17.17,17.17 17,17.17 17.17 17.17, 181919 Y 17.1717 17.171; p O [ P ~ ,9 20 21:21 18 17 16 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 17 1 9 18 18 18 18 17 18 17 18 17 1f Q 20 21.21 20 18 17 16 16 16 16 15 16 16 15 15 15 15 15 15 15 15 16 16 15 16 17 17 16 16 17 18 17 16 17 17 1: [' R 21 20202019171 17 16 16 16 15 15 16 15 15 16 15 15 15 16 16 16 16 16 16 18 18 18 17,18 19 19 20 19 15 L. S 20 21 l 19 19 17 17 16 16 15 15 15 16 16 15 16 16 15 15 15 16 16 16 16 16 - 17 17 19 18 18 18 ' 19 18 18 19 18 15 T 2 21'21 20 18 18 18 18 17 17 17 15 15 16 15 16 16 16 16 16 16 16 16 16 16 17 18 18 17 17 17 18 18 18 18 1@ U 22 21 20 18 18 18 17 18 17 17 16 16 16 16 16 15 15 15 16 17 17 16 16 16 17 18 17 17 17 17 19 1818 18 1,g 22 21 21'18 19 19 19 17 17.17 16 16 17 17,16 16 16 16 16 16 15 15 15 16 17 18 18 18 18 17 E.I 7 ' M V 1 W 22 21 21 20 17 19 19 18 17 17 16 16 16 17 17 16 15 15 15 16 16 16 17 16 15 16 17,1I E 2 i 21 2019 20 18 19 18 17 17 16 16 16 ' 16 16' 16 16 1p 3.fd" i51'4 5 1 Xt 1 Y 2019 19' 18 17 18 18 18 18'17 ' 17 16 16 h $15 15' 1 15' N Z E '17 17 17.1616 Y 6 16 A 15,.15.'1,619 M '16 16'16' AA. 16 15 17'16 16. BB CCi I DD 1

2. 3: 4: 5 67.89 1011 1213141516171819 20 2122 23 24 25 26 27 28 29 30 3132 33 34 35 3j

Notes, l

l

1. Exposure rate measurements are depicted as showa

2. All exposure rate measurements were taken at - 1 h l

l l ~-

W A S4 >N Y E '38 39'40 41: 42 43 44 45'46 47.48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 16 M 71) 17 17 17[ 16 A 15 18 17 18 8 16 18 17 7 .C .17 18 18 16 D 15 15 16 16'15 16'16 16 16 15 15.16 16 16 16 ' 15 15 16 16 16 15 15.16 15 16 1p 18 1 5 E $h,, p 17.17;18 18 1817 17 17 18 17 17 17 18 18 18 18 18 17 17 17 17 16 16 17 16 16 16 3 19 '18 j i8.18 18 18 18 ' 18 18 17,18 19 18 19 18 18 18 18 18 18.18 18 18 18 18 17 17 17 17 18g a

17 17 17 17.18 18 18 18.17 17 18 18 18 18 18 18 18 17 16 16 16 17 16 17 17 _17 17 17 17 18,j H 17 17 ~ 17 17 17 17 17 17 ' 17 17 17 17 16 17 17 17 17 17 18 18 18 17.17 17 17 17 17 17 17.. -.

' 16 16 16 17 17 ' 16 17 in 16 17 16 16 16 16 16 16 16 17 17.17 17 17 16 16.16 16 16 y15. J/ 6 15 16!16 17 17 16 16 17 16 16 17 17 16,16 16 16 17 17 17 17 17 16 16 16 16 16 16 15 15 15 _jK -17 17417 17 16 17 17.17 17 17 16 17 17 17 17 17 17 17 17 17 17 16,16 16 '16 = 16 16 15 15 15 L 116.16 16 17 17 17 ; 16 16 15 16 16 16 17 - 17 17 17 17 17 17 17 17 16.16 16 16 16 1515,1 d4 y 15 17 18.17 16 ' 17 17 17 17 17 17 ' 17 17 17 18 17 17 17 17 17 17 17 17 1d6J6 I 13 14 '14 N '.17.17:18 17;16.17 17,17.17 17 17 17.17.17 17 17 17.17 16;16 (4 ,0 13'15 7 13 13 14 15 14

17,18'17 18 18 18.1717,17.1717.17.17.1717117,1717'1717d5'14 14 14.15 p

215 17 17 17 18 18 18 18 18 18 18'18 18 18 17.17 17 { 15'14 ' ' g 19 18 17 17 17 19 19 18 817h1 3p. 3 1 .R kh~'~P3 . u, M, % i19 19!18: 19 S 3 + 1

17 18 f 18 '18 18 18 ;18 17)&

1 's {/ r '} u Also A 3 en , y Apem m Cwd i .W ,X b "f*',""" 4 l Y Z AA i +. i e i i BB i cc DD )38 39 40 4142 43 44 45 46 47 48 49 50 5152 53 54 Sh 56 57 58 59 60 6162 63 64 65 66 67 results tre in R/hr. 7 from the surface. I i-I h

L Figure 10: Surface Exposure Rate Measurement Locations and Results. 1 2i3'4=5! 6 7. 8i 9 :10'11 12'13 14 15 16;17.18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 3/ l0ii n @ M id'W @f $ " gjyk{ gMC.[,*M2 '. .M..,, >,... A'

17 18 ' 17 16 16 15 :16 l 16 18 18 - 18.18 18 ~ 18 Eastern Portion of Building 37 South n

4 s wypr7pce-w9rrem++ye,e~wryry~~~- B 17 18 18 17 17 17 17 16 18 17 17 18 18 18 16 C 19 18 20 18.18'18 16 17 16 17 17'17 19 18 17 16 17 17 17'17 16 17 16'16 16'16 17 17'18 18 18 17 15 I D .,,,,18 19 19 18'18 17 17'17 17 18 17 18 18 15 15 16 16'15 15'14 15 16'15 15 15 16 iE9 15 15 15 14 E 19 19'18'18I18 18'18'18'17'18 18 18 Q717' 15' 15'15 14 14 15 15 14 15 15 15 11' TQ 15 1717) 1616 1515 If 4 g F ,201g 18 15 5 $i p. f G 5 o,,,n. 1.1/2" Drain - 6 Orain - H 14HpRh. 1411 pRh 14-15 pR/hr ,wamat scan. womai scan womal scan I ( 1 { h L t-M N ,). ( O R T l + i U I ^ if Ib V . T. q 55 W T X ' ;.. a -. - 71 '1 15 15'14 15 14 15 15 y 15 16 15.16 ') " ' ~ '6,15.1 Z AA -=. i 's-16 1 16 { .16.16 16 17 BB 9 s-CC; DD; 1-2'3 4: 56 7. 8 9 ~ 1011 1213141516171819 20 2122 23 24 25 26 27 28 29 30 3132 33 34 35 3f f? (u gg {

1. Exposure rate measurements are depicted as shown. /

,L

2. All exposure rate measurements shown above were tal Cdi

3. Each 3m x 3m grid shown above was scanned - 100%

p 9 erf'5 56

r W A S4 >N ? E )7'38 39'40 41.42 43 44 45'46 47 48 49 50 51 52 53 54 55 56 57 58 59. 60 61 62 63 64 65 66 67 16 1 ' Sorrento Valley Centra! Land ~16 { Area Boundary a ,A 15 B 17 D [15 1515 16: 1515 15 15 16 M 15 16'16 15 15 15 15'16 15:15 15 15 15 15.16 ) ify 1 k E l [ 16 ,F 17 oren - lG W11 pH/hr SOrrento Valley Central Land ' nanal scan ; Area Boundary H ,/ .) 'i -f 3/ ,K ./ i db ' 13 13 14 34 14 15'14'j4'15 15' N j 13'13'13' ' O

i..

94; .. p 4 34 14. 4 4 .jgu's"5. jf1'5~15 Qy-{g g j;

g. '

CED i ' ' s t,:. 59 "1 4 ! L . 7'171I1' Prope'rty Boundah U Also /4vtbux.a eri i Aperture Ccrd y W X h f = 3 n** sb ,Y Z AA BB cc DD D7 38 39 40 414E 43 44 45 46 4N 48 49 50 5152 53 54 55 56 57 58 59 60 6162 63 64 65 66 67 Esults cra in pR/hr. at contact with the surface. i)-6* from the surface. I ca" y/- / e

t a; Figure 11: Soil Sample Locations 1i x G 'm l! . !. i l 2 ! 3 ! 4 ! 5 ! s i.7 ! s i 9 !10'11i12 !13 ;14 l15 !16!17l1819 :20I21!22 23 24 25 26'27 28'29 30 3132 33 ; ,..,,,,,, i j s i 4 4 ! i i ! ! ! i l ' [f wa=M;@spr4twW s av M ic.s m. t ~ A !' l1 l'. 3 i t j l ; i > r ; Eastern Portion of Building 37 South E"~ ~ B l, ' 'l,I l """N""""" i e

7..

y. ._p, r .-c i _ .p; i,, i , i 1 1.a .q p.;, ..o p g, Di i i i i l 'Ef f,, ' " h..[._Y (b ' ' (iD E5r I @ )] ...- r. .!.., m ' i ! i j I Fi ,', 10 i '. i Gi i 4 i 1 H> ,1 f p!'. - g'. p .g. g .e K: i i L. i 3 .. _. p a M, i t .a .i ,.a .. yN..g. 9. N r, a O! ....i..c)_,!.,.3 s ( gg 7.. r e .7.. g O.!.._ t l l l ; ! i i r.. i R! ! 4 a # . +, +. a.. . i J s r - l ;. .,_.t ,.c 4 1 -._+2 .! y, T i ,!. i .!L., i i + f l : ; t i .- 1 r, o 4 -,,- i i i ! t' U' ! t _;_..i_.>. i I : ! Ej 1 .4 ' i i ! i i ', ', ,,.._,.a. . o . -..V i .. 'l .L.a .. ;.. j _ A ;.-. l _ J.- 4. _ _...., .q. . __ ij i i - V) i i ._Wi j i _.l l i ! _ _p, ,. s i t i 25 i ...j....;,..._._j..... .;.. l. _,O.. ..7,_..., Xl . i. ;:.., i } i - j -. }.j ..j .p ., *....i -, __..i.-.. p ,l Y l i .. s ? J'. _. m, a 4{ g. ... +.,,... 4 Z! 1, e. - - :: l ~ ! : i i u .l ,.i ,) ._3_ j ; i AAj 3 ( _,1s , P I._ i +i .a. e. . - 1 1- _BB ; i n 21 l ! ! l.., 1.. .i ~.,......a. .e F; . -....i~ 4.,. cc j i,

l. _..l....

l DD! t..;-,--,..,',,,-. 2i.'...._;....,...,.. ,a 1. l,.. 1! 2 3 ! 4 j S j 6.! 7 ! 8 ! 9 !10,! 1112 !13 14i.15 16'17!18i19:20:21:22 23 24 25 26 27 28 29 30 31:32 33 1 d Notes: r

1. Soil sampling results are provided in Tables 6A (gs l

2. O = Approximate location of soil sample.

3. Soil samples were obtained from the landscaped s i

Ii ,a e-m

s __ _ w A S4 >N E 33 36 37 38 39 40 41 42 43 44 45 46 47'48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65.66 67 IA \\ B \\ C D / $ Y\\ E I F \\G \\H t e e a -) .1..-- 3/ iK L N o D. LO 00 ST) s./ /)3Pti[$ j i)h?ll;5 ) .O DA^13 b*: rN ' ' 2' ,R , Q 2, 2a ~ s Albu hve M,e on Anneurr Crrd 26 V @ 3 x a meter gras W x Y Z AA BB CC DD 35 36 37'38 39 40 41 42.43 44 45 46 47 48 49 50 51.52.53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 Tia spectroscopy) and 68 (exposure rate measurements & p scans). is only. ~

Appendix to 1 Final Radiological Survey Performed at General Atomics' Sorrento Valley Central Land Area dated July 28,1999 l " Final Survey Plan for the Sorrento Valley Central Land Area" dated January 26,1999

I,; [ d Date: 01/26/99 [ Prepared by: Hank Buchanan, Kevin Busby & John Turner Approved by: / [//7/d.old PaulMaschka Finni Survey Plan for the Sarrento Valley Central Land Area INTRODUCTION General Atomics (GA) is continuing its efforts to radiologically survey / sample, as appropriate, in order to obtain the release to unrestncted use ofselected facilities and land areas. The land area, identified as "Sorrento Valley Central" is located near and to the east of GA's Building 37 facility. [ This Final Survey Plan is to be implemented to ensure that residual contamination is not present in this land area and to demonstrate that the radiation levels on the surface and in the collected soil sainples are well below GA's approved release criteria for unrestricted use. SITE DESCRIPTION A plan view of the GA site is shown in Figure 1. He location of the "Sorrento Valley Central" land area in relation to other facilities at GA's Sonento Valley Site is shown in Figure 2. The "Sorrento Valley Central" land area is shown in Figure 3. He total land area is approximately acres ( [ ft'). PREVIOUR IHRTORY A Cf.AMIFICATION This land area is located near the fonner "SVA Fuel Manufacturing Facility" which has been decommissioned, dismantled and the site and sunounding footprint area released to unrestricted use. The land area, "Sorrento Valley Central," was classified as an " unaffected area" because it had never beca used for work involving radioactive materials. The north half of the parking lot had been used for the L.pc,r iy storage of radioactive waste boxes from the SVA Fuel Manufacturing Facility Decommissioning Project. nese packages had been properly packaged, scaled and the exteriors surveyed for removabic contamination. The exterior contamination levels were below the release criteria. No radioactive waste packages were stored in the south half of the parking lot. ne land area, composed of asphalt and concrete, was utilized by employees to park their private vehicles. The land area also contains soil within the parking medians which serve as planters for grass, trees, plasts and flowers. The front (east) entry to Building 37 is also landscaped as well as several other aress around and inside the fence line (see Figure 3). CRITERrA POR RRI.RAER TO UNRFETRICTRn URR Runnance R ate GuiAalina The guideline value for exposure rates measured at I m above the surface, is 10 R/hr above background levels. Normal background is 12-15 pR/hr [ lof5 I l 1 F

d Snil Relanea Criterin The predominant radionuclides found in soil at GA and the soil release criteria in pCi/g is provided below: Cs-137 15 pCi/g i Co-60 8 pCi/g Thorium (n-228 + n-232) 10 pCi/g i Enriched Uranium (U-234 + U-235) 30 pCi/g Depleted Uranium 35 pCi/g If more than one radionuclide exists, the sum of the fractions of the concentrations is calculated a follows: C l' E,.sL, I C, The average soil concentration of radionuclide I. = L, 'Ibe maximum soil limit forI(pCi/g). = The sum of the fractions must be less than one in order for the soil to meet the release criteria. Accantable Rinrface Enntaminatinn Leveln I The primary contaminants ofconcem for this site are natural thorium and enriched uranium (i.e., as previously utilized in the former "SVA Fuel Manufactunng Facility"). Enriched IIranium-The applicable guidelines for residual contamination on surfaces for enriched uranium are: 5,000 dpm/100 cm' (averaged over a 1 m' area) 15,000 dpm/100 cm' (maximum in a 100 cm' area if the average over I m' is met) 1000 dpm/100 cm' (removable activity) It is GA's goal to release the land area for unrestricted use with levels < 1000 a dpm /100cm8 (thoriurn limit). Natiiral Thnrium The approved guideline values for residual contamination for release to unrestricted use for natural thorium are provided below: 1,000 dpm/100 cm'(averaged over a 1 m' area) 3,000 dpm/100 cm' (maximum in a 100 cm' area if the average over 1 m' is met) 200 dpm/IOO cm'(removable activity) As interpreted by the NRC, the average 1000 dpm/100cm and the maximum 3000 dpm/100cm 2 2 should apply to both alpha and beta measurements, independently, for surface contamination 2 of 5 F u w l

involving natural thorium.' Alpha measurements will be performed to detect < 1000 m dpm/100 crn'. Thoriurn emits alpha radiation to beta radiation in a 1:0.67 ratio; therefore, the corresponding average and maxanum beta activity guidelines were adjusted to be 670 dpm/100cm and 2000 8 dpen/100cm', respectively, for beta monitoring. Since the instruments cannot distinguish between uranium and thorium contamination, the most restrictive activity guideline was used to compare all direct measurernents for beta activity. ha Guidalina Vahian (tharium) The modified guideline values for residual contamination for release to unrestricted use for natural thorium are provided below: 670 dpm/100 cm' $ (avmgalovera 1 m ma) 2 2000 dpm/100 cm' $ (maximum in a 100 cm' area if the avmge over 1 m' is met) 200 dpm/100 cm' S (removable activity) It is GA's goal to release the land area for unrestricted use with levels < 670 $ dpm /100cm' (modified thorium limit). ALERT LEVEIR If the followmg " alert levels" are exceeded, notify HP Management so an evaluation can be performed to determine ifincreased survey coverage is required or to evaluate ifdecontamination is required. l Beta Alert Levels > 300 cpm beta above background using the large area (434 cm') probe > 150 cpm above background using the 100 cm probe Alnha Alart I2vels > 150 cprn alpha using the large area (434 cm') probe 2 2 > 75 cpm using a hand-held 50 cm alpha probe (~ 750 dpm/100cm ) i i I I " Interpretation of Thorium Surface Decontamination Limits," U.S. Nuclear Regulatory Cornaussion, Feinmary 9,1992. 3 of 5 I i

I FINAL SURVEY PLAN 1. Griddine Grid the area into 10 A x 10 A (3m x 3m) squares. 2. Remna - PR Scan 10% of the asphalt and conente area at 1 meter above the surface with a microR

detector, j

Take one Exposure Rate Measurement in each 3m x 3m grid block at I meter above the surface. Document on a drawing where the measurements were taken. 3. Rc=a= - A lah= =ad Rata-===== Scan Appmximately 10% of the entire surface area (asphalt or concrete) for alpha and beta 2 with the large 434 cm floor monitors. Document on a drawing where the readings were taken. I 4. Radiatina Ma==" reman'= Radiation measurements consist of direct surface readmgs and removable contamination measurements. Take radiation measurements in every other grid block on concrete and asphalt only. Alternate the measurements between: 2

1. a 100 cm beta measurement (one minute reading) 2

2. a 100 cm smear 2

3. a 50 cm alpha measumment (10 second reading)

4. A 100 cm* smear.

Using the pattem below i,,,, iO0cW alph. 100ce bea 100cW alpha 100cW bets 100cm' l~ 100cm' ben 100cm' alpha 100cm' Document all readings in cpm and record on a drawing where the readings were taken. SQIL SURVEV PLAN AND PROCEDURES I 1. Soil samples will be obtained in the landscaped areas only, not in the asphalt or concrete areas. Surface samples to a depth of 0-6 inches (~15 cm) will be obtained every 20 meters (~ 65 % ft). Document on a drawing where the soil samples were taken. 2 2. Each of the soil sample locations will be frisked with a hand-held 15 cm GM pancake l detector and a microR meter (& measurements recorded). 4 of 5 I

[- 1 n.nn..u.g y g-s -.a c-.a.g "Ihese shallow samples will be collected to a depth of 15 cm (0-6") using manual equipment (i.e., long handled spade). The samples will be properly logged, labeled, tracked and packaged into plastic bags. All debris (i.e., grass, rocks, sticks, asphalt and foreign objects) will be removed from each sample. Soil samples will be crushed to reduce large lumps. All samples will be dried, placed into tared marmelli beakers (filled to the top), weighed, transferred to and counted in the GA Health Physics Counting Laboratory by gamma spectroscopy. Soil samples will be analyzed in GA's Health Physics Laboratory with a Canberra Low Sensitivity Gamma Spectroscopy MCA System using a high purity Germanium Detector. He system is calibrated using NIST traceable standards and performance checked daily. ( Soil samples collected will be counted for a minimum of 30 minutes each. A 30 minute count is sufficient to detect the radionuclides ofinterest (Cs-137, Co-60, U-235, U-238 and thorium daughters) at levels well below GA's approved soil release criteria. Initially each soil sample will be placed into a properly labeled plastic bag and then transferred to a mannelli beaker after prepping the sample. The bag and beaker will be identified as follows: 01/27/99 (Date) SVC-001-99 (Sample ID) B-34 (Grid ID) Kevin Busby /Cornelius Stanley (Name ofsoil collectors) DOCtJMENTATION Every survey / sampling conducted will be documented on a daily basis to a worksheet/ drawing showing the approximate locations surveyed / sampled. De documentation must include the results of the measurements (including units), the technician's signature, date, instrument (s) used (including the model and serial number of both the ratemeter and detector), cahbration due date, % efHeiency, background readmgs (if applicable) and any other pertinent information. Each soil sample must also be properly labeled and tracked. j 5 ors I

m.. -

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ML20210K202

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