Text

Request to Release Certain Portions of General Atomics Facility to Unrestricted Use and Delete Them from Its License: Namely, Torrey Pines East (TPE) Land Areas
	ML013390423
Person / Time
Site:	07000734
Issue date:	11/20/2001
From:	Asmussen K; General Atomics
To:	Adams M, Kwok S; NRC/NMSS/FCSS/FLIB, State of CA, Dept of Health Services
References
	-RFPFR, 696/CAL-3420
	Download: ML013390423 (82)
	v • d • e

+ GENERAL ATOMICS November 20, 2001 696/CAL-3420 VIA EXPRESS DELIVERY SERVICE Ms. Mary Adams Licensing Section 1/Licensing Branch Division of Fuel Cycle Safety and Safeguards, NMSS U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Docket No.70-734; SNM-696: Request to Release Certain Portions of General Atomics' Facility to Unrestricted Use and Delete them from its License: Namely, Torrey Pines East (TPE) Land Area and Ms. Sudana Kwok (in Duplicate)

State of California Department of Health Services Radiologic Health Branch Mail Stop 178 601 North 7th Street Sacramento, CA 95814-0208

Subject:

Radioactive Materials License No. 0145-37: Request to Release Certain Portions of General Atomics' Facility to Unrestricted Use and Delete them from its License: Namely, Torrey Pines East (TPN) Land Area

Dear Ms. Adams and Ms. Kwok:

As you are aware, General Atomics (GA) is continuing its efforts directed at decontaminating, as appropriate, and obtaining the release to unrestricted use of selected facilities and land areas at General Atomics. GA has recently completed the Final Radiological Survey of the Torrey Pines East (TPE) Land Area located on GA's Main Site.

This parcel of land is located Southeast of the TRIGA Reactor Complex and the former Hot Cell site on GA's Main Site. See Figure 1. The total land area to be released to unrestricted use is approximately 101,100 ft2 (-9,400 M2). See Figure 2.

In December 1998, a portion of the Torrey Pines East Land Area, was used to temporarily store D&D materials awaiting release to unrestricted use/disposal (soil, asphalt, concrete, metal panels, re-bar, etc.). This area was known as the Soil Staging Area (SSA).

Soil and debris from GA's Hot Cell Site (along with soil and debris from other facilities and land areas) was placed in the SSA awaiting disposition. In 1999, a survey of the soil removed L

from the former Hot Cell Facility (HCF) site identified elevated activity levels in the form of Cs 137 and Co-60 hot particles. Subsequently, the Hot Cell soil was disposed of as radioactive

\\

waste.

During the performance of the final survey, three (3) hot particles and one (1) activated/contaminated piece of concrete debris were found in this area. The contaminants fJ P0 BOX 85608, SAN DIEGO, CA 92186-5608 (619) 455-3000 3550 GENERAL ATOMICS COURT, SAN DIEGO, CA 92121-1194

were identified as Cs-137 and Co-60. Following the removal of these three hot particles, exposure rate measurements decreased to acceptable levels. Additionally, soil containing elevated Cs-1 37 and Co-60 concentrations was also removed from the concrete storm drain culvert and disposed of as radioactive waste. No other remediation was necessary in this land area.

The Torrey Pines East Land Area was also used to evaporate rain water which had collected in an excavation pit within the former Hot Cell Site. This water, which contained trace concentrations of Cs-1 37 and Co-60, was transferred to storage containers located on the Torrey Pines East Land Area and allowed to naturally evaporate in large open containers.

The sludge was then packaged and disposed of as radioactive waste.

Enclosed is GA's report titled "General Atomics' Final Radiological Survey Report for the Torrey Pines East (TPE) Land Area. This report documents the results of the comprehensive radiological measurements and sampling and analyses completed on the TPE land area. The results of these surveys, measurements, and analyses demonstrate that the Torrey Pines East Land Area meets the NRC-and State-approved release criteria for release to unrestricted use.

Accordingly, GA hereby requests the NRC and the State to release the Torrey Pines East Land Area, as described in this letter and the enclosed report, to unrestricted use and delete it from GA's NRC and State of California radioactive and special nuclear material licenses, respectively. Consistent with discussions during the April 2001 NRC/State/GA coordination meeting, it is GA's understanding that the NRC is the lead regulatory agency for the release of the Torrey Pines East Land Area.

If you should have any questions regarding this request or the enclosed report, please contact Laura Q. Gonzales at (858) 455-2758, or me at (858) 455-2823. Your assistance in responding to this request is very much appreciated.

Very truly yours, Keith E. Asmussen, Ph.D., Director Licensing, Safety and Nuclear Compliance Figures:

"Figure 1: Torrey Pines (Main) Site Land Areas" "Figure 2: Torrey Pines East Land Area"

Enclosure:

GA report titled: "General Atomics' Final Radiological Survey Report for the Torrey Pines East (TPE) Land Area," dated November 2001.

cc:

Dr. D. Blair Spitzberg, Chief, NMSS Branch 3, Region IV Mr. Wayne L. Britz, Fuel Cycle Inspector, NRC Region IV Ms. Kathleen Henner, State of CA, Brea, CA Dr. Mina Goeders, State of CA, Brea, CA

Figure 1: Torrey Pines (Main) Site Land Areas TORREY PINES HOT CELL SITE TORREY PINES NORTHEAST Reactors

& Land TORREY PINES EAST TFF TORREY PINES SOUTH N

S Bunker Yard LINAC 25 Bldg. 21/27 Utility Pad Bldg.

II'

Figure 2 : Torrey Pines East Land Area Torrey Pines East Land Area 1

drainage collection depression L

1dr 2

3 i

4 5

6 7

8 10 11*

12!

13 1

14 15 16 17 18 I

L 1F~F Torrey Pines East Boundary I

I I

I i

/

i SI 1

1 1I i

I I

IjStaging Ara II I

1 F/

fl F

I I

I I111 I

1 1

1 I

I 1

I I

I L

l

Figure 2

GENERAL ATOMICS' FINAL RADIOLOGICAL SURVEY REPORT for Torrey Pines East (TPE) Land Area Prepared By: William LaBonte, Richard Stowell, and Laura Gonzales Illustrated By: Stephen Finchum and Richard Stowell Final Survey Technicians: Richard Stowell and Phil Poole Confirmatory Survey Technicians: Barbara Lyons and Will Schuck November 2001

Table of Contents LIST O F TA BLES ii LIST OF FIGU RES..............................................................

111 INTRODU CTION................................................................

1 SITE DESCRIPTION.............................................................

1 H istory of U se.............................................................

1 Classification..............................................................

2 CRITERIA FOR RELEASE TO UNRESTRICTED USE.................................

2 Facilities and Equipm ent.....................................................

3 Release Criteria for Soils.....................................................

3 Exposure Rate Guideline.....................................................

3 INSTRUMENTATION AND BACKGROUND MEASUREMENTS........................

4 Background Measurements for Instruments/Detectors 4

Background Soil Concentrations of Concern.....................................

4 Exposure Rate Background...................................................

4 FINAL SURVEYS PERFORMED....................................................

5 Objectives and Responsibilities...............................................

5 Survey Plan...............................................................

5 Soil Sam pling.............................................................

6 SURVEY SUM M ARY............................................................

6 COMPARISONS OF SITE DECOMMISSIONING PLAN REQUIREMENTS WITH FINAL SURVEYS PERFORMED ON THE TORREY PINES EAST LAND AREA..... 7 RESULTS OF THE FINAL SURVEYS...............................................

8 Exposure Rate Scans.......................................................

8 Beta and Alpha Scanning....................................................

8 Fixed M easurements (ax and P)................................................

8 Rem ovable A ctivity.........................................................

9 Soil Sam ples...........................................................

9 Fixed Exposure Rate Measurements........................................

10 CONFIRMATORY SURVEYS.................................................

11 C O N CLU SION..............................................................

11 List of Tables Table 1:

USNRC's Acceptable Surface Contamination Levels.........................

T-1 Table 2:

State of California's Acceptable Surface Contamination Levels.................

T-2 Table 3:

Torrey Pines East Land Area List of Instruments............................

T-3 Table 4:

Background Soil Sample Results.........................................

T-5 Table 5:

Torrey Pines East Land Land Area Wipe Survey Results......................

T-6 Table 6:

Torrey Pines East Land Land Area Soil Sample Results.......................

T-9 ii

List of Figures (unpaged)

Figure 1:

Torrey Pines (Main) Site Land Areas.

Figure 2:

Torrey Pines East Land Area.

Figure 3:

Torrey Pines Land Area Classifications.

Figure 4:

Torrey Pines East Alpha Scan Measurements Locations and Results.

Figure 5:

Torrey Pines East Beta Scan Measurements Locations and Results.

Figure 6:

Torrey Pines East Exposure Rate Scan Measurements Locations and Results.

Figure 7:

Torrey Pines East Fixed Exposure Rate Measurements Locations and Results.

Figure 8:

Torrey Pines East Soil Sample Locations.

Figure 9:

Torrey Pines East, Hot Cell Facility Storage Yard and Drainage Ditch Fixed Measurements and Removable Contamination Survey.

Figure 10:

Torrey Pines East, Truck Staging Area Fixed Measurements and Removable Contamination Survey.

Figure 11:

Torrey Pines East, Parking Lot Fixed Measurements and Removable Contamination Survey.

Figure 12:

Torrey Pines East, Truck Scale Fixed Measurements and Removable Contamination Survey.

Appendixes Appendix A: Final Survey Plan for Torrey Pines East Land Area....................

A-1 Appendix B: GA Confirmatory Survey Plan and Results for Torrey Pines East Land Area GA Confirmatory Survey Plan.....................................

B-1 Results of GA's Confirmatory Survey...............................

B-8 iii

Final Radiological Survey Report for Torrey Pines East Land Area Introduction General Atomics (GA) is continuing its efforts directed at decontaminating, as appropriate, and obtaining the release to unrestricted use of selected facilities and land areas at General Atomics.

GA has recently completed the Final Radiological Survey of the Torrey Pines East (TPE) Land Area located on GA's Main Site. This parcel of land includes: (1) the land area used to temporarily store D&D materials awaiting release to unrestricted use/disposal (soil, asphalt, concrete, metal panels, re-bar, etc.), known as the Soil Staging Area (SSA), (2) a portion of land used to store radioactive material from the former Hot Cell Facility and (3) a storage area used to evaporate water which came from a Hot Cell pit that had filled with rain water. See Figure 1 for an illustration of GA's Torrey Pines (main) site and Figure 2 for the Torrey Pines East Land Area boundary for an illustration of the area to be released. The total land area to be released to unrestricted use is approximately 101,100 ft2 ( -9,400 in2).

GA is requesting both the Nuclear Regulatory Commission (NRC) and the State of California (DOHS/RHB) to release this parcel of land to unrestricted use.

This report documents the results of GA' s radiological measurements and soil sampling and analysis completed on the Torrey Pines East Land Area. The results of these surveys and analyses demonstrate that this land area meets the NRC-and State-approved criteria for release to unrestricted use.

Site Description History of Use The Torrey Pines East land area consists mainly of open land area. A portion of TPE is paved with asphalt. This parcel of land is located Southeast of the TRIGA Reactor Complex and the former Hot Cell site on GA's Main Site. See Figure 1 and Figure 2 for an illustration of the Torrey Pines East Land Area in relationship to other land areas on GA's Main Site.

In December 1998, a large portion of this land area was established as a controlled storage area for D&D materials generated at the many GA D&D projects until unrestricted use/disposal for this material was granted by the NRC and/or the State of California. The material stored in this area was surveyed and released prior to removal from the originating site. Prior to this date, the majority of this land area had no history of use or storage of radioactive material. In 1999, a confirmatory survey of the soil removed from the former Hot Cell Facility (HCF) site identified elevated activity levels in the form of Cs-137 and Co-60 hot particles. Subsequently, the area 1

+GENERAL ATOMMICE

Final Radiological Survey Report for Torrey Pines East Land Area where the HCF soil was stored was posted and controlled as containing radioactive material.

This soil was eventually disposed of as radioactive material.

A portion of this Torrey Pines East land area was enclosed by the HCF Controlled Area and used to store radioactive material awaiting dispositioning (packaging and disposal as radioactive waste; or, survey and release to unrestricted use). This area was also used to evaporate rain water that collected in an excavation pit within the former HCF site. This water contained trace quantities of Cs-137 and Co-60 and was allowed to naturally evaporate in large open containers.

The evaporated sludge was packaged and disposed of as radioactive waste.

There are no known sewer systems that traverse this piece of land, however, the western and northern portions of this land area collected storm water drainage from the TRIGA and HCF sites. The storm drain from the HCF was surveyed as part of the HCF final release survey. The storm drain from the TRIGA site, the concrete drainage ditch on the west side of this property and the collection depression on the North end, with it's associated stand pipe, were surveyed as part of this final survey.

Classification The portions of this parcel of land that were impacted by the former HCF material storage and use are classified as Suspect Affected Areas* (approximately 35,000 ft2, or 3,300 M2). The portion of land formerly used to load and survey transport vehicles for the HCF soil shipments is classified as a Non-Suspect Affected Area (approximately 8,600 ft2 or 800 m2). The remaining portions of land are classified as Unaffected and Non-Impacted Areas. See Figure 3 for details.

Approximately 600 m2 was changed from Non-Suspect Affected Area to Suspect Affected Area after contamination was found on the asphalt in the Truck Staging Area in the drain collection depression. Additional surveys were conducted.

Criteria for Release to Unrestricted Use This parcel of land has been divided into four (4) different survey classifications, depending on the history of the land. A large portion of this land is classified as "Non-Impacted". Non Impacted areas have no history of use involving radioactive material.

The only activities involving radioactive material on this parcel of land, (storage processing, and packaging) were associated with the former HCF. The predominate isotopes associated with the 2

Final Radiological Survey Report for Torrey Pines East Land Area former HCF are the fission product Cs-137, and the activation product Co-60. The NRC release criteria for mixed fission and mixed activation products is as follows:

Facilities and Equipment (and Asphalt or Concrete Surfaces) 5,000 dpm /100 cm2, averaged over a 1 m2 area 15,000 dpm /100 cm2, total, maximum in a 100 cm 2 area 1,000 dpm/100 cm2, removable activity Release Criteria for Soils The predominant radionuclides found in the soil at GA and the approved release criteria in pCi/g (above natural background concentrations) for these radionuclides are provided as follows:

Enriched Uranium (U-234 + U-235) 30 pCi/g Thorium (Th-228 + Th-232) 10 pCi/g Depleted Uranium 35 pCi/g Cs-137 15 pCi/g Cs-134 10 pCi/g Co-60 8 pCi/g Eu-152 11 pCi/g If more than one radionuclide exists, the sum of the fractions of the concentrations is calculated as follows:

SC i < 1 Li Ci = The average concentration levels of radionuclide i in the sample (above background).

Li = The release criteria for radionuclide i.

The sum of the fractions must be less than or equal to one (1).

Exposure Rate Guideline Exposure rates measured at 1 m above the surface are not to exceed 10 itRlhr above natural background levels.

3

+GENERAL ATOMICS

Instrumentation and Background Measurements A list of instruments used during the radiological surveys is provided in Table 3. The table includes: (1) a description of the instrument, model number and its 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 minimum detectable activity (MDA' s),

if applicable and (6) calibration efficiencies (if applicable). All of the instruments used are calibrated semiannually and after repair, except for exposure rate meters which were calibrated quarterly.

Background Measurements for Instruments/Detectors Building 13 on GA's main site was used for conducting background measurements with instruments used for the final survey because: (1) there is no history involving radioactive materials or storage of radioactive materials in Building 13, and (2) the various surfaces and construction materials found at the Torrey Pines East Land Area could also be found within and outside of Building 13. Background information, where appropriate, is included in Table 3.

Minimum detectable activities (MDA's) for instruments used for fixed measurements, for each type of surface (see Table 3), were calculated using equation (5-2) from the NUREG/CR-5849 as shown below:

Equation (5-2)

MDA= 2.71+4.65BRt(dpm/lO0cm

2)

Where:

txExA 100 BR =background rate (cpm) t = count time (min)

E = efficiency A = area of the detector (cm2)

Background Soil Concentrations of Concern Typical 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 4 along with the locations where these samples were taken.

Exposure Rate Background Typical exposure rate background for GA's site using a Ludlum Model 19 micro R meter is 12-18 [tR/hr measured at 1 m from the surface of soil. This range of exposure rates can be 4

+GENERAL ATOMICS Final Radiological Survey Report for Torrey Pines East Land Area

Final Radiological Survey Report for Torrey Pines East Land Area 5

measured south of Building 15 (an office building on the eastern portion of the GA site).

Measurements taken offsite in 10 different locations (9 offsite and 1 onsite at a non-impacted area near Building 15) over a period of 15 months also averaged - 15 !LR/hr (measured at 1 m from the surface). The range of 12-18 itR/hr is typical at the GA site for the external dose rates measured at 1 meter from the surface. Background measurements @ 1 m above asphalt surfaces are generally higher due to the higher concentrations of naturally occurring radioactive material (NORM). This background fluctuates depending upon the asphalt batch used and the date applied. This background, (measured at 1 m from the surface) ranges from 22-30 ýIR/hr.

Final Surveys Performed Objectives and Responsibilities The objectives of the final survey plans were: (1) to demonstrate that the average surface contamination levels for each survey unit were below the approved release criteria, (2) to show that the maximum residual activity did not exceed three times the approved release criteria for average surface contamination value in an area up to 100 cm2, (3) to demonstrate soil sample results at the surface were well below GA's approved release criteria for unrestricted use, and, (2) that the exposure rate measurements taken in these areas, measured at 1 meter above the surface, were less than 10 [R/hr above background.

Survey Plan A Final Survey Plan was developed based on the previous use history of the Torrey Pines East Land Area site, the radionuclides of concern for this area, the potential for contamination, the various types of surfaces encountered and the classification of the various areas. A copy of the Final Survey Plan for the Torrey Pines East Land Area. is provided in Appendix A.

Surveys were taken in accordance with an approved survey plan by qualified Health Physics Technicians having a minimum of three years health physics experience. Soil samples 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.

Soil Sampling Soil samples were collected in approximate locations as indicated on Figure 8.

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 crushed to reduce large lumps, dried, placed into tared marinelli beakers (filled to the top), weighed, sealed and transported to GA's Health Physics Laboratory. The sampling locations were documented on a drawing.

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 of concern at levels below GA's approved soil release criteria.

Survey Summary Comparisons of the Site Decommissioning Plan requirements with the Final Surveys performed in relation to the percentage of surface area scanned, number of measurements (i.e., number of fixed radiation measurements), exposure rate measurements ([R/hr) and soil samples taken in the following table:

6 Final Radiological Survey Report for Torrey Pines East Land Area

+

GENERAL ATOMICS Final Radiological Survey Report for Torrey Pines East Land Area Comparisons of Site Decommissioning Plan Requirements with Final Surveys Performed on the Torrey Pines East Land Area Survey Area**

Gridding

of Direct

of Exposure Rate W/P, Surface

of Soil Required Measurements Measurements Scans on asphalt Samples

?

Fixed a, [, or

([tR/hr) or concrete Taken and wipes on concrete (and Exposure Rate Analyzed or asphalt Scans)

D-Plan*

No Not Required Not Required Not Required Not Required Non-Impacted Final Surveys Yes Fixed a =6, 211 10% of asphalt 35 surface Non-Impacted lOm x loin Fixed [ =6, plus 1 at each soil surfaces.

(0-6")

grids Wipes=6 sample location &

Total = 18 25% scan D-Plan*

No 1 per 50 m2 or 1 per lOm 2, or 1 per 10% of surface Not Required Unaffected Area 1 every - 7 m 3m plus 1 at each areas (asphalt 32 Required soil sample location, and concrete)

Final Surveys Yes Fixed a =31, 145 10% of asphalt 11 surface Unaffected Area 10n x 10m Fixed [ =32, plus 1 at each soil surfaces (0-6")

grids Wipes=29.

sample location, and Total = 92 25% surface scan.

D-Plan*

No 1 per 20 m2 or 1 1 per 10 m2 or 10% of surface Not Required Non-Suspect every -4.5 m.

1 per - 3 m areas (asphalt)

Affected Area 3 Required Final Surveys Yes Fixed a =13, 87 100% of surface 7 surface Non-Suspect lOm x lom Fixed P =11, plus 1 at each soil area (metal and (0-6")

Affected Areas grids Wipes=10.

sample location, and asphalt).

Total = 34.

25% scan D-Plan*

Yes 1 every 4m 2 or I per 4 m2 or 100% of 165 (on a 5 m Suspect Affected 1 every 2 m.

1 every 2m.

accessible triangular Area 250 Required concrete and grid system) asphalt surfaces Final Surveys Yes Fixed a =87, 1038 plus 1 at each 100% of 173 surface Suspect Affected 10m x 10m Fixed [ =90, soil sample location, accessible (0-6") and 10 Areas grids Wipes=86.

and 100% scan concrete and sub-surface Total = 263 asphalt surfaces (6"-12")

D-Plan = GA Site Decommissioning Plan The total surface area to be released is approximately 101,1100 ft2 ( -9,400 m2).

7

+

GENERAL ATOMICS Final Radiological Survey Report for Torrey Pines East Land Area Results of the Final Surveys The results for the Torrey Pines East Land Area Final Surveys are provided in figures and tables as noted below:

Exposure Rate Scans Exposure rate scans were performed in 25% of accessible Unaffected and Non-Impacted Areas with the detector held approximately 1" from the surface. The results ranged from 12-23 ptR/hr.

100% of the suspect affected areas were scanned at the surface (approximately 1" for the surface) with a 2"x2" NaI(T1) detector. The exposure rate results ranged from 8-23 pR/hr. See Figure 6 for locations and results.

During the performance of this survey, three (3) hot Particles and one (1) activated/contaminated piece of concrete debris were found in areas used to store and handle soil from the former HCF.

Following remediation of these elevated areas, the maximum exposure levels were 19 jiR/hr.

The exposure rate scan is usually the first survey to be performed.

Beta and Alpha Scanning 100% of the accessible asphalt surfaces and metal truck scale in Suspect and Non-Suspect Affected Areas, and 10% of the surfaces in non-suspect and unaffected areas were scanned using large area (434 cm2) gas flow proportional counters (floor monitors) for ax and P radiation.

Three (3) hot particles were detected during the 03 scans. One particle was found in the truck Staging Area and two particles were found in the HCF Storage Yard. The particles were disposed of as radioactive waste and the areas were re-scanned. Scanning results decreased to typical background levels after removal of the hot particles.

The results of the scans are presented in Figure 4 (for (X) and Figure 5 (for P3). Elevated readings on the concrete storm ditch or culvert (shown in Figure 3) were noted. Typically, background readings on concrete with the floor monitor range from 1600-1995 cpm, but readings inside the concrete culvert ranged from 2100-2800 cpm; elevated due to the type of concrete and the geometry (inside a culvert). This area was investigated further by taking fixed measurements on the concrete. The results showed only background radiation levels (see Figure 5).

Fixed Measurements (CC and W)

Fixed measurements were performed for beta radiation using a gas-flow proportional counter having a 100 cm2 detector. The counting time for the beta fixed measurements was two (2) minutes. For fixed measurements, appropriate backgrounds were determined for each type of 8

Final Radiological Survey Report for Torrey Pines East Land Area surface and subtracted from the survey readings. The readings were then converted to dpmrlO00 cm2 using the efficiency (the detector size is 100 cm2).

Alpha fixed measurements were taken using alpha counters having a 50 cm 2 alpha scintillation detector coupled to a ratemeter. Fixed measurements were 10 seconds each.

There were a total of 137 fixed c and 139 fixed [3, measurements taken. All results were far below the release criteria. The highest ca fixed measurement was <218 dpm/100 cm2 (the MDA for this instrument) and the highest P fixed measurement was 438 dpm/100 cm2 ; both were well below the 5,000 dpm/100 cm2 average limit in a 1 m2 area. See Figures 9, 10, 11, and 12 for a and P results and approximate locations where the measurements were taken.

Removable Activity Smear surveys consisted of using a Whatman Filter Paper (4.7 cm diameter) and wiping an area of -100 cm2. The smears were then counted in GA's Health Physics Laboratory using a Canberra 2404 low level alpha/beta gas flow proportional counter.

A total of 131 wipe measurements were taken and analyzed for a and P activity. The highest a activity was <10 dpm/100 cm2, the highest 0 activity was 22 dpm/100 cm2. These results are far below the approved release criteria of 1,000 dpm/100 cm2 for beta/gamma emitters. See Table 5 for results and Figures 9, 10, 11, and 12 for appropriate sample locations. (No alpha contamination was detected on this site).

Soil Samples A total of 226 surface soil samples (0"-6") were collected. In addition, 10 sub-surface (6"-12")

soil samples were taken in areas where remediation was performed. The approximate soil sample locations are shown in Figure 8. Gamma spectroscopy results for each of these samples are provided in Table 6. A summary of the results is provided below.

__________38u pCi/g 235U pCi/g

"' 7CspCi/g Total Th pCiIg

°Co pCi/g High 3.70 0.41 3.24 5.80 0.98 Low 0.07 ND ND 1.42 ND Average 1.43 0.17 0.11 3.15 0.07 Typical Background 2.26 0.18 0.09 4.00 ND 9

+GENERAL ATOMICS

+

CENERAL ATOMICS Final Radiological Survey Report for Torrey Pines East Land Area Notes:

1.

ND means not detected, <0.1 pCi/g Cs-137, <0.1 pCi/g Co-60, <3.0 pCi/g U-238, <0.3 pCi/g U-235.

2.

The High concentrations for each isotope did not occur in the same sample. No sample result has a sum of fractions greater than 1 with background subtracted.

The isotopic results (pCilg) indicated that, in some samples, 13 7 Cs, 6°Co, and 152Eu were present (when counted for 30 minutes), but the results were all well below the approved soil release criteria. Naturally occurring 238U, 235U, 228Th, and 232Th were present at levels that were not discernable from background levels. Sample TPE-S-183, collected in a concrete drainage ditch, had elevated levels of 137Cs and 'Co; the soil and debris was removed from the ditch and disposed of as radioactive waste.

The highest U-235 result was 0.41 pCi/g, at the surface (0-6"),collected at location on Figure 8.

Thorium contamination was not present (as determined by process knowledge and gamma spectroscopy analyses of soil samples). All thorium results were at, or near, background levels and well below the release limit of 10 pCi/g.

The activation product,6Co, was identified in trace concentrations in 22 out of 236 samples. All of the results were far below the release limit of 8.0 pCi/g.

In a few of the soil samples, trace concentrations of the fission product 137Cs were present. The maximum concentration detected was 3.24 pCi/g with an average of 0.11 pCi/g. All of the results were well below the release limit of 15 pCi/g.

The activation product `52Eu was detected in trace concentrations in two (2) samples. The highest concentration in any sample was 1.07 pCi/g; far below the release criteria of 11 pCi/g.

The activation product 134Cs was detected in two (2) samples. The highest concentration detected was 0.06 pCi/g, which is far below the release criteria of 10 pCi/g.

Fixed Exposure Rate Measurements Direct radiation levels were measured at 1 m from the surface at locations using a 1 "x1" NaI(T1) detector. The maximum reading was 20 [tR/hr, which is less than 10.tR/hr above a typical background level of 15 jIR/hr. Thus, all readings were less than the approved release criteria.

See Figure 7 for locations and results.

10

11 Confirmatory Survey Following the completion of the Final Survey, a Confirmatory Survey was performed, by GA HP technicians, who were not associated with the Final Survey. The purpose of this survey was to confirm that the Final Survey was effective in identifying the radiological conditions of the area.

The internal Confirmatory Survey was conducted in accordance with an approved survey plan, a copy of which is provided in Appendix B. It consisted of:

(1)

The collection and gamma spectroscopy analysis of 35 surface soil samples, (2)

The taking of 15 fixed a measurements on paved surfaces, (3)

The scanning of 10% of the paved surfaces for alpha activity, (4)

The taking of 14 fixed P measurements on paved surfaces, (5)

The scanning of 10% of the paved surfaces for beta activity, (6)

The collection of 14 wipe samples on asphalt surfaces (analyzed for gross a and gross activity),

(7)

The exposure rate scanning of 10% of the entire area with a [IR meter held within 1" of the surface, and, (8)

The collection of 88 exposure rate measurements at 1 meter from the surface at fixed locations and at contact and lm from the surface at each soil sample location.

All measurements were in agreement with the final survey results and all measurements were below the applicable release criteria. See Appendix B for details of and results.

Conclusion Final contamination and radiation surveys, as well as the results of analyses of soil samples, as documented in this report, demonstrate that the Torrey Pines East Land Area meets the approved criteria for release to unrestricted use.

Final Radiological Survey Report for Torrey Pines East Land Area

Table 1: USNRCS ACCEPTABLE SURFACE CONTAMINATION LEVELS Nuclides IAverage b4 Maximum",','I Removahleb~e,

(

1j (dpm/1OO cm2)

(dpmi/00em')

U-nat, 235U, 238U, & associated decay products 5,00 ac 15,000 ac 1,000 ca Transuranics, 226Ra, 228Ra, 23°Th, 228Th, 231Pa, 100 300 20 227Ac, 1251, 1291 Th-nat, 232Th, 9°Sr, 223Ra, 224Ra, 232 U, 126 1, 1331, 1,000 3,000 200 1311 Beta/gamma emitters (nuclides with decay modes other than alpha emission or 5,000 15,000 1,000 spontaneous fission) except 9°Sr and other noted above.

a Where surface contamination by both alpha-and beta/gamma-emitting nuclides exists, the limits 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, an geometric factors associated with the instrumentation.

c Measurements of average contaminant should not be averaged over more than 1 square meter.

For objects of 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.

e The amount of removable radioactive material per 100 cm 2 of surface area should be determined 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 of less 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 1 cm2 and 1.0 mRad/hr at 1 cm2, respectively, measured through not more than 7 milligrams per square centimeter of total absorber.

T-1

"T%.hl. '.

TAT1i' (il CA ACEPTIgI~ARF,,ql]1RFACE]l' CONTAMINATION LEVELS '

SNuclidese Averageba MaximnumPA Removablebr N........

(

(dpm/lOOemZ) I (dpmn/lOOcm)

U-nat, 235U, 238U, & associated decay 5,000 15,000 1,000 products Transuranics, 226Ra, 228Ra, 230ThI, 228Th, 100 300 20 2 31Pa, 227Ac, 1251, 1291 Th-nat, 232Th' 90Sr, 223Ra, 224Ra, 232U, 1261, 1,000 3,000 200 1331, 1311 Beta/gamma emitters (nuclides with decay modes other than alpha emission or 5,000 15,000 1,000 spontaneous fission) except 9°Sr and other noted above a Where surface contamination by both alpha-and beta/gamma-emitting nuclides exists, the limits 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, an geometric factors associated with the instrumentation.

c Measurements of average contaminant should not be averaged over more than 1 square meter. For objects of 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 '.

e The amount of removable radioactive material per 100 cm2 of surface area should be determined 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 of less 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 1 cm2 and 1.0 mrad/hr at 1 cm2, respectively, measured through not 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

Table 3: List of Instruments Torrey Pines East Land Area

Background

Instrument Detector Range Calibration Due Efficiency

'-"-0-----

Description (cpm,,iRlhr or mRlhr)

Date MDA (I dcm2 P & 50CM2 r) detectors only)

Ludlum Ludlum Model 43-37 gas Four Linear Ranges Active Probe Area = 434 cm2. The detector and rate meter Model 2221 (434cm2) proportional 0-500,000 & one Log 11-03-01 21.29%

10 - 40 cpm (concrete) are combined and mounted on a roll around cart. The S/N 148425 Alpha detector 50-500,000 10 - 40 cpm (asphalt) instrument features a static-flow system, quick connects, a S/N 086236 (cpm) 7 - 26 cpm (metal) portable gas bottle and a means to adjust the height of the detector from the floor for optimum performance.

Ludlum Ludlum Model 43-37 gas Four Linear Ranges 1600-1995 cpm (concrete)

Active Probe Area = 434 cm2. The detector and rate meter Model 2221 (434cm2) proportional 0-500,000 & one Log 01-11-02 23.71%

2900-3300 (asphalt) are combined and mounted on a roll around cart. The S/N 154202 Beta detector 50-500,000 1015-1163 cpm (metal) instrument features a static-flow system, quick connects, a S/N 149017 (cpm) portable gas bottle and a means to adjust the height of the detector from the floor for optimum performance.

1042 + 90 cp2m (concrete)

Ludlum Ludlum Model 43-68 Four Linear Ranges MDA = 313 dpm/1OOcm 2 Model 22214 100 cm 2 proportional 0-500,000 & one Log 01-08-02 24.43%

S/N 84423 Beta detector 50-500,000 1371 + 55 cp2m (asphalt)

S/N 119444 (cpm)

MDA = 358 dpm/100cm 2 100 cm 2 gas flow proportional counter 665 + 35 cp2m (metal)

MDA = 171 dpm/100cm2 Ludlum Model 19 RCA 6199 coupled to a Five Ranges 1 inch x 1 inch Nal (TI) scintillator is mounted internally.

Micro-R Meter Nal (TI) Scintillator 0-5 mR/hr 12-28-01 N/A 12-18 RR/hr Used for measuring external dose rates on the surface and S/N 87120 at one meter Ludlum Model 19 RCA 6199 coupled to a Five Ranges 10-08-01 1 inch x 1 inch NaI (TI) scintillator is mounted internally.

Micro-R Meter Nal (TI) Scintillator 0-5 mR/hr 01-14-02 NA 12-18 gR/hr Used for measuring external dose rates on the surface and S/N 123930 at one meter.

Ludlum Ludlum Model 44-10 14-18 IpR/hr (concrete) 2 inch x 2 inch Nal (TI) scintillator. Used for measuring Model 3 Nal (TI) Scintillator Four Ranges 07-04-01 NA 16-18 ItR/hr (asphalt) external dose rates on the surface and at one meter.

S/N 147819 Gamma Detector 0-500 FtR/hr 09-28-01 8-13 FR/hr (metal)

S/N 153765 12-07-01 12-18 gR/hr (soil) 18-22 itR/hr (gravel)

T-3

TnhlP

"kt li-f 1nf ntrnment* Thrrev Pines East Land Area

Background

Instrument Detector Range Calibration Due Efficiency MD

-10c Description (cpm, KR/hr or mR/hr)

Date MDA (100cm 2 l & 50cm2 a detectors only)

Ludlum Ludlum Model 44-62 2 inch x 2 inch Nal (TI) scintillator. Used for measuring Model 3 Nal (TI) Scintillator Four Ranges 10-08-01 NA 13-19 xR/hr (soil) external dose rates on the surface and at one meter.

S/N 151348 Gamma Detector 0-2500 RR/hr 20-21 ItR/hr (asphalt)

S/N 154618 Ludlum Ludlum Model 43-64 Active Probe Area = 50 cm 2 Model 12 Alpha Scintillator Four Ranges 12-26-01 21.58%

0 - 20 cpm (all)

Used for alpha surveying.

SIN 91051 ZnS (Ag) 0-500,000 cpm MDA = 218 dpm/100cm2 S/N 094053 Ludlum Ludlum Model 43-64 Active Probe Area = 50 cm2 Model 12 Alpha Scintillator Four Ranges 08-31-01 21.58%

0 - 20 cpm (all)

Used for alpha surveying.

S/N138739 ZnS (Ag) 0-500,000 cpm MDA = 218 dpmi/100cm2 S/N 145699 Ludlum Ludlum Model 43-64 Active Probe Area = 50 cm 2 Model 12 Alpha Scintillator Four Ranges 01-10-02 21.58%

0 - 20 cpm (all)

Used for alpha surveying.

S/N 138738 ZnS (Ag) 0-500,000 cpm MDA = 218 dpm/100cm2 S/N 142349 CanberraLow Level Gas Flow Canberra Model 2404 Low Level a/13 gas proportional Ud0 Counter Proportional Detector N/A As needed 30%

Varies with Sample counting system used to count wipes for removable Model 2404 contamination. Results are usually reported as dpm/100cm 2.

Canberra Gamma High Purity Varies with Gamma Spectroscopy MCA system using a high purity Spectroscopy System Germanium Detector N/A As needed Sample Varies with Sample Germanium detector.

T-4

Sample 1C5 6lCo 22Th 232 Th Total 23 u ID 661.6 keV 1173 keV peak 238 keV peak 911 keV peak Thorium 63.3 (92.7) 144 (186) keV peak 22Th + 232Th keV peak peak X-1 ND ND 0.71+/- 0.07 0.97 +/- 0.25 1.69 1.17 +/- 0.77 (0.13 +/- 0.06)

X-2 ND ND 0.90 +/- 0.13 1.49 +/- 0.31 1.49 1.91 +/- 1.18 (0.13 +/- 0.08)

X-3 0.06 +/- 0.04 ND 1.49 +/- 0.10 1.56 +/- 0.25 3.05 1.45 +/- 0.80 (0.23 +/- 0.09)

X-4 ND ND 1.52_+/-0.23 3.22_+/-_0.61 4.74 3.74+/-2.18 (0.28_+/-0.17)

X-5 ND ND 1.92 +/- 0.17 2.41 +/- 0.53 4.33 (4.49 +/- 1.64)

(0.32 +/- 0.16)

X-6 ND ND 1.02 +/- 0.08 0.96 +/- 0.23 1.99 1.31 +/- 0.80 (0.14 +/- 0.06)

X-7 0.13 +/- 0.08 ND 1.59 +/- 0.14 2.40 +/- 0.38 3.98 2.16 +/- 1.48 (0.18 +/- 0.10)

X-8 ND ND 1.44 +/- 0.28 1.40 +/- 0.28 2.84 2.30 +/- 1.16 (0.14 +/- 0.09)

X-9 0.09 +/- 0.08 ND 0.89 +/- 0.10 1.27 +/- 0.31 2.15 1.59 +/- 1.05 (0.10 +/- 0.08)

X-10 ND ND 1.29 +/- 0.11 1.52 +/- 0.36 2.80 1.10 +/- 0.96 (0.16 +/- 0.08)

Soil samples were collected on 06/05/00 and 06/06/00 By Ed Rudgers off GA's site but close to GA.

Samples were counted 7/20/00 through 7/24/00 for 30 minutes (same count as the soil samples).

ND means:

< 0.1 pCi/g for Cs-137

< 0.1 pCi/g for Co-60 T-5 Table 4: Gamma Spectroscopy Results of Background Soil (Surface) Samples Radionuclide Concentrations (foCi/gm) - Results +/- 2 a-30 Minute Counts Notes:

1.

2.

3.

Wipe Gross cc in Gross P in I Wipe Gross a in Gross P in No I dnm/100 cm2 I dDm/100 cm No.

I dpm/100 cm2 dpm/100 cm2 Hot cell Storage Yard (Figure 9) 1

<10

<10 26

<10

<10 2

<10

<10 27

<10

<10 3

<10

<10 28

<10 14 4

<10

<10 29

<10

<10 5

<10

<10 30

<10

<10 6

<10

<10 31

<10

<10 7

<10

<10 32

<10

<10 8

<10

<10 33

<10

<10 9

<10

<10 34

<10

<10 10

<10

<10 35

<10

<10 11

<10

<10 36

<10

<10 12

<10

<10 37

<10 11 13

<10

<10 38

<10

<10 14

<10

<10 39

<10

<10 15

<10

<10 40

<10

<10 16

<10

<10 41

<10

<10 17

<10

<10 42

<10

<10 18

<10

<10 43

<10

<10 19

<10

<10 44

<10

<10 20

<10

<10 45

<10

<10 21

<10

<10 46

<10

<10 22

<10

<10 47

<10

<10 23

<10

<10 48

<10

<10 24

<10

<10 49

<10

<10 25

<10

<10 50

<10

<10 T-6

Table 5: LINAC Land Area Wipe Survey Results Wipe No.

Gross a in Gross P in Wipe Gross a in Gross P in dpm/100 cm2 dpm/100 cm 2 No.

dpm/100 cm 2 dpm/100 cm2 Truck Staging Area & Parking Lot (Figures 10& 11) 1

<10

<10 26

<10

<10 2

<10

<10 27

<10

<10 3

<10

<10 28

<10

<10 4

<10 14 29

<10

<10 5

<10

<10 30

<10

<10 6

<10

<10 31

<10

<10 7

<10

<10 32

<10

<10 8

<10

<10 33

<10

<10 9

<10

<10 34

<10

<10 10

<10

<10 35

<10

<10 11

<10

<10 36

<10

<10 12

<10

<10 37

<10

<10 13

<10

<10 38

<10

<10 14

<10

<10 39

<10

<10 15

<10

<10 40

<10

<10 16

<10

<10 41

<10

<10 17

<10

<10 42

<10

<10 18

<10

<10 43

<10

<10 19

<10

<10 44

<10

<10 20

<10

<10 45

<10

<10 21

<10

<10 46

<10

<10 22

<10

<10 47

<10

<10 23

<10

<10 48

<10

<10 24

<10 22 49

<10

<10 25

<10 14 50

<10

<10 T-7

Wipe Gross cc in Gross P in Wipe Gross al in Gross P in No I dlnm/100 cm I dtmIOO cm2 I No.

I dpm/100 cm2 I dpm/lO0 cm2 Truck Staging Area & Parking Lot (Figures 10& 11), Continued.

52

<10

<10 57

<10

<10 52

<10 11 58

<10

<10 53

<10

<10 59

<10

<10 54

<10

<10 60

<10

<10 55

<10

<10 61"

<10

<10 56

<10

<10 62

<10

<10 Truck Scale (Figure 12) 1

<10

<10 6

<10

<10 2

<10

<10 7

<10

<10 3

<10

<10 8

<10

<10 4

<10

<10 9

<10

<10 5

<10

<10 10

<10

<10 Drainage Ditch (Figure 9) 1

<10

<10 6

<10

<10 2

<10

<10 7

<10

<10 3

<10

<10 8

<10

<10 4

<10

<10 9

<10

<10 5

<10

<10 T-8

-Table 6:

V L

Are Soil S

l Results

Table 6: Torrev*Pines East Land Area Soil*Sample Results U-238 (63Kev, 93 Key used when 63 not present)

U-235 (144Kev,186 Kev used when 144 not present)

Radionuclide Concentrations (pCi/g)

Background Not Subtracted, 30 ain. count Cs-137 (662 Key) r I

r a

Co-60

[(1170 Kev+1330 Key) /21 Total Thorium Th-228(238 Kev), plus Th-232(911 Kev)

Other Isotopes I

I I

V pCi/g pCi/g pCi/g pci/g pCig pCi/g Isotope 1

TPE-S-1 0.99 +/- 1.20 0.24 +/- 0.08 0.11 +/- 0.09 ND 2.74 +/- 0.55 ND 15 2

TPE-S-2 1.96 +/- 1.29 0.10 +/- 0.08 0.08 +/- 0.09 ND 3.18 +/- 0.41 ND 18 3

TPE-S-3 2.11 +/- 1.55 0.11 +/- 0.09 ND ND 3.94 +/-_0.61 ND 18 4

TPE-S-4 1.75 +/- 0.95 0.17 +/- 0.10 0.74 +/- 0.10 ND 2.97 +/- 0.41 ND 20 5

TPE-S-5 1.87 +/- 1.13 0.12 +/- 0.08 1.38 +/- 0.14 0.10 +/- 0.09 2.96 +/- 0.52 ND 19 6

TPE-S-6 1.68_+/- 1.25 0.20+/-0.11 0.29+/-0.10 0.12+/-0.11 3.36_+/-0.47 ND 19 7

TPE-S-7 3.14 +/- 0.94 0.22 +/- 0.13 1.32 +/- 0.16 0.21 +/- 0.15 3.94 +/- 0.62 ND 19 8

TPE-S-8 1.41 +/-_0.57 0.11 +/-_0.08 0.16_+/-0.09 ND 3.13 +/-_0.46 ND 18 9

TPE-S-9 0.98-+/--1.12 0.26_+/-0.11 ND ND 3.51_+/-0.55 ND 18 10 TPE-S-10 1.41 +/- 1.08 0.17 +/-0.11 0.09+/-0.07 ND 4.06_+/-0.59 ND 18 11 TPE-S-11 1.94+/- 1.17 0.16_+/-0.10 ND ND 3.61 +/-_0.56 ND 17 12 TPE-S-12 2.58 +/- 0.91 0.20 +/- 0.08 ND ND 3.49 +/- 0.46 ND 18 13 TPE-S-13 1.29 +/- 1.24 0.16 +/- 0.08 0.07 +/- 0.06 ND 2.76 +/- 0.47 ND 17 14 TPE-S-14 2.35 +/- 1.04 0.22 +/- 0.09 0.11 +/- 0.08 ND 3.06 +/- 0.51 ND 18 15 TPE-S-15 1.77 +/- 1.05 0.11 +/- 0.08 ND ND 3.37 +/- 0.53 ND 18 16 TPE-S-16 1.74 +/- 1.26 0.20 +/- 0.08 0.23 +/- 0.08 ND 3.58 +/- 0.54 ND 18 17 TPE-S-17 1.35 +/- 1.09 0.13 +/- 0.08 ND ND 3.77 +/- 0.48 ND 18 18 TPE-S-18 1.24 +/- 1.02 0.19 +/- 0.09 ND ND 3.31 +/- 0.48 ND 18 T-9 Sample ID Exposure Rate in p.R/hr at 1 meter from surface

Table 6: Torrev Pines East Land Area Soil Sample Results

-alu:Tre ie atLadAe olSml eut U-238 (63Kev, 93 Kev used when 63 not present)

U-235 (I44Kev, 186 Key used when 144 not present)

Cs-137 (662 Key)

Radionuclide Concentrations (pCi/g)

Background Not Subtracted, 30 thin. count Co-60

((1170 Kev+1330 Key) /2)

Total Thorium Th.228(238 Key), plus Th-232(911 Key) 11 Other Isotopes I.

'I I

I ni/hr nCi/g nCi/g pCi/g pCi/g pCi/g Isotope 19 TPE-S-19 1.21 +/-_0.99 0.19+/-_0.10 0.15+/-_0.07 ND 3.34+/-_0.48 ND 18 20 TPE-S-20 1.75 +/- 1.03 0.20 +/- 0.10 ND ND 3.67 +/- 0.47 ND 18 21 TPE-S-21 1.41 +/- 0.94 0.13 +/- 0.08 0.20 +/- 0.08 ND 3.04 +/- 0.46 ND 18 22 TPE-S-22 1.86 +/- 1.17 0.17 +/- 0.09 ND ND 3.91 +/- 0.49 ND 18 23 TPE-S-23 1.63 +/- 1.17 0.16 +/- 0.08 0.08 +/- 0.06 ND 3.32 +/- 0.47 ND 18 24 TPE-S-24 1.18 +/- 1.00 0.15 +/- 0.07 0.14 +/- 0.08 ND 3.74 +/- 0.50 ND 18 25 TPE-S-25 1.23 +/- 1.06 0.18 +/- 0.09 0.19 +/- 0.08 0.09 +/- 0.05 3.49 +/- 0.45 ND 18 26 TPE-S-26 0.89 +/- 1.04 0.12 +/- 0.09 0.08 +/- 0.05 ND 3.45 +/- 0.48 ND 18 27 TPE-S-27 0.99 +/- 1.07 0.19 +/- 0.09 ND ND 3.67 +/- 0.47 ND 19 28 TPE-S-28 2.00 +/- 1.09 0.13 +/- 0.08 0.24 +/- 0.09 ND 3.22 +/- 0.48 ND 18 29 TPE-S-29 1.48 +/- 0.88 0.09 +/- 0.08 ND ND 3.54 +/- 0.47 ND 18 30 TPE-S-30 1.73 +/- 1.20 0.18 +/- 0.09 0.10 +/- 0.07 ND 3.14 +/- 0.43 ND 17 31 TPE-S-31 1.63+/-_0.74 0.27+/-_0.10 0.18+/--0.13 ND 3.30+/-0.52 ND 18 32 TPE-S-32 1.41 +/- 1.08 0.08 +/-0.07 0.18 +/-0.08 ND 3.04 +/-0.52 ND 18 33 TPE-S-33 1.62++/- 1.13 0.16+/-_0.11 ND ND 3.33 +/-0.45 ND 18 34 TPE-S-34 1.56-+/- 1.01 0.21 +/- 0.10 ND ND 3.84 +/-0.46 ND 17 35 TPE-S-35 1.92+/- 1.09 0.18+/-_0.09 0.15+/-_0.06 ND 3.60-+/-0.45 ND 18 36 TPE-S-36 1.43 +/- 0.92 0.18 +/- 0.08 0.08 +/- 0.07 ND 3.57 +/- 0.48 ND 18 T-10 Sample ID Exposure Rate in S.tR/hr at 1 meter from surface r

Table 6: Torrev Pies East, Land Area Soil Sample Results T

6: Torrey Pi" East Land A

S S

Results Radionuclide Concentrations (pCi/g)

RBackground Not Subtracted. 30 min. count

.U-238 (63Kev, 93 Kev used when 63 not present) 1U-235 (l44Kev,186 Key used when 144 not present)

Cs-137 (662 Key)

Co-60

{(1170 Kev+1330 Key) /2)

Total Thorium Th-228(238 Key), plus Th-232(911 Key)

Other Isotopes iI i

I,,

i a nCik

nCi/*:

pCi/g pCi/g Isotope Exposure Rate in

[tR/hr at 1 meter from surface 37 TPE-S-37 1.32 +/- 1.05 0.13 +/- 0.09 0.09 +/- 0.06 ND 3.49 +/- 0.51 ND 18 38 TPE-S-38 0.77 +/- 0.79 0.16 +/- 0.09 ND ND 3.75 +/- 0.46 ND 18 39 TPE-S-39 1.18 +/- 0.93 0.19 +/- 0.08 0.22 +/- 0.08 ND 3.53 +/- 0.52 ND 18 40 TPE-S-40 1.41 +/- 1.09 0.17 +/- 0.09 0.11 +/- 0.08 ND 3.84 +/- 0.45 ND 18 41 TPE-S-41 0.93 +/- 0.92 0.18 +/- 0.10 ND ND 3.50 +/- 0.48 ND 19 42 TPE-S-42 1.05 +/- 0.96 0.14 +/- 0.08 ND ND 2.78 +/- 0.45 ND 18 43 TPE-S-43 2.33 +/- 1.22 0.25 +/- 0.11 0.17 +/- 0.06 ND 3.47 +/- 0.44 ND 18 44 TPE-S-44 2.45 +/- 0.88 0.21 +/- 0.09 ND ND 3.46 +/- 0.51 0.05 +/- 0.06 Cs-134 18 45 TPE-S-45 1.64 +/- 1.24 0.17 +/- 0.08 ND ND 3.16 +/- 0.48 ND 17 46 TPE-S-46 1.07 +/- 1.10 0.13 +/- 0.08 ND ND 3.12 +/- 0.52 ND 17 47 TPE-S-47 1.34 +/- 1.33 0.13 +/- 0.08 0.17 +/- 0.08 0.11 +/- 0.09 3.20 +/- 0.47 ND 19 48 TPE-S-48 1.13 +/- 1.04 0.17 +/- 0.10 0.07 +/- 0.07 ND 3.26 +/- 0.52 ND 19 49 TPE-S-49 2.57 +/- 0.94 0.17 +/- 0.08 0.13 +/- 0.06 ND 3.13 +/- 0.53 ND 18 50 TPE-S-50 1.10 +/- 1.08 0.08 +/- 0.09 0.11 +/- 0.06 ND 3.26 +/- 0.50 ND 18 51 TPE-S-51 0.75 +/- 0.66 0.07 +/- 0.06 0.19 +/- 0.08 ND 1.92 +/- 0.43 ND 16 52 TPE-S-52 1.08 +/- 1.03 0.11 +/- 0.07 0.26 +/- 0.07 ND 2.69 +/- 0.45 ND 17 53 TPE-S-53 1.00 +/- 0.67 0.09 +/- 0.07 0.25 +/- 0.07 ND 2.25 +/- 0.41 ND 16 54 TPE-S-54 1.17 +/- 0.80 0.09 +/- 0.08 0.30 +/- 0.09 ND 1.98 +/- 0.49 ND 15 T-11 Sample ID oCi/g n*i/o':

-Tabe 6: "

P E

L ri*le Results Sample ID Table 6: Torrev Pines East Land Area Soil Sample Results U-238 (63Kev, 93 Key used when 63 not present)

U-235 (l44Kev,186 Key used when 144 not present)

Radionuclide Concentrations (pCi/g)

Background Not Subtracted, 30 min. count Cs-137 (662 Key)

Co-60

{(1 170 Kev+1330 Key) /2)

Total Thorium Th-228(238 Key), plus Thb232(91 i Key)

Other Isotopes I

I I

I rnCi/L DCi/g pCilg pci/g pCi/g pCi/g Isotope 55 TPE-S-55 1.91 +/- 0.71 0.11 0.08 ND ND 3.74 +/- 0.47 ND 18 56 TPE-S-56 0.91 +/- 1.08 0.12 +/--0.08 ND ND 3.49 +/- 0.47 ND 18 57 TPE-S-57 1.58 +/- 0.89 0.17 0.08 0.16 +/- 0.06 ND 3.38 +/- 0.46 ND 18 58 TPE-S-58 1.72 +/- 1.02 0.28 +/- 0.32 ND ND 3.45 +/- 0.47 ND 18 59 TPE-S-59 1.18 +/- 0.86 0.19 0.08 0.25 +/- 0.09 ND 3.40 +/- 0.47 ND 17 60 TPE-S-60 1.74 +/- 0.65 0.16 +/- 0.06 0.18 +/- 0.06 ND 2.54 +/- 0.38 ND 17 61 TPE-S-61 1.76 +/- 1.29 0.12 +/- 0.08 0.09 +/- 0.07 ND 3.40 +/- 0.44 ND 17 62 TPE-S-62 1.59 +/- 0.94 0.21 +/- 0.08 ND ND 3.12 +/- 0.45 ND 18 63 TPE-S-63 1.15 +/- 1.25 0.27 +/- 0.08 ND ND 3.40 +/- 0.47 ND 18 64 TPE-S-64 1.16 +/- 0.86 0.12 +/- 0.05 ND ND 2.79 +/- 0.36 ND 18 65 TPE-S-65 1.08 +/- 0.96 0.19 +/- 0.09 ND ND 3.73 +/- 0.54 ND 18 66 TPE-S-66 2.35 +/- 1.39 0.22 +/- 0.08 ND ND 3.41 +/- 0.43 ND 18 67 TPE-S-67 2.14 +/- 0.92 0.12 +/- 0.08 ND ND 3.78 +/- 0.51 ND 18 68 TPE-S-68 1.31 +/- 1.02 0.17 +/- 0.07 ND ND 3.19 +/- 0.37 ND 17 69 TPE-S-69 1.68 +/- 1.31 0.24 +/- 0.09 ND ND 3.52 +/- 0.50 ND 17 70 TPE-S-70 2.77 +/- 0.73 0.18 +/- 0.07 0.13 +/- 0.06 ND 3.20 +/- 0.36 ND 18 71 TPE-S-71 1.66 +/- 0.65 0.17 +/- 0.08 ND ND 3.31 +/- 0.39 ND 18 72 TPE-S-72 1.76 +/- 1.01 0.21 +/- 0.06 ND ND 3.26 +/- 0.42 ND 18 T-12 Exposure Rate in

+/-R/hr at 1 meter from surface

Table 6: Torrey Pines East Land Area Soil Sample Results U-238 (63Kev, 93 Kev used when 63 not present)

U-235 (144Kev,186 Key used when 144 not present)

Radionuclide Concentrations (pCi/g)

Background Not Subtracted, 30 main. count Cs-137 (662 Key)

Co-60

((1170 Kev+1330 Key) /2)

Total Thorium Th-228(238 Key), plus Th.232(911 Key)

Other Isotopes I

I.

t I

pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g Isotope 73 TPE-S-73 1.50 +/- 1.08 0.16 +/- 0.08 ND ND 3.68 +/- 0.44 ND 19 74 TPE-S-74 2.30 +/- 1.17 0.20 +/- 0.07 ND ND 3.34 +/- 0.36 ND 17 75 TPE-S-75 1.65 +/- 1.14 0.15 +/- 0.07 0.16 +/- 0.07 ND 3.32 +/- 0.46 ND 17 76 TPE-S-76 1.65 +/- 1.02 0.15 +/- 0.07 0.05 +/- 0.05 ND 3.54 +/- 0.41 ND 17 77 TPE-S-77 1.68 +/- 1.20 0.17 +/- 0.09 ND ND 4.10 +/- 0.50 ND 18 78 TPE-S-78 1.10 +/- 1.02 0.21 +/- 0.09 ND ND 3.62 +/- 0.46 ND 17 79 TPE-S-79 1.69 +/- 1.28 0.18 +/- 0.09 ND ND 3.55 +/- 0.50 ND 17 80 TPE-S-80 1.06 +/- 1.07 0.10 +/- 0.10 ND ND 3.61 +/- 0.50 ND 16 81 TPE-S-81 2.01 +/- 1.29 0.11 +/- 0.08 0.11 +/- 0.10 ND 3.45 +/- 0.47 ND 17 82 TPE-S-82 1.80 +/- 1.02 0.20 +/- 0.10 ND ND 4.02 +/- 0.41 ND 16 83 TPE-S-83 2.63 +/- 0.81 0.11 +/- 0.09 ND ND 3.50 +/- 0.45 ND 17 84 TPE-S-84 1.46 +/- 1.00 0.18 +/- 0.09 ND ND 3.69 +/- 0.48 ND 17 85 TPE-S-85 1.45 +/- 1.10 0.20 +/- 0.08 ND ND 3.78 +/- 0.43 ND 17 86 TPE-S-86 1.73 +/- 0.91 0.13 +/- 0.06 0.09 +/- 0.08 ND 2.97 +/- 0.43 ND 18 87 TPE-S-87 1.27 +/- 1.08 0.21 +/- 0.09 ND ND 3.77 +/- 0.52 ND 17 88 TPE-S-88 1.45 +/- 1.25 0.15 +/- 0.06 ND ND 3.47 +/- 0.35 ND 18 89 TPE-S-89 1.83+/- 1.11 0.19 +/-0.09 ND ND 3.64 +/-0.53 ND 19 90 TPE-S-90 1.32 +/- 1.20 0.16 +/- 0.10 ND ND 2.92 +/- 0.45 ND

-17 T-13 I.

I' Sample ID Exposure Rate in VtR/hr at 1 meter from surface

Table 6: Torrey Pines East Land Area Soil Sample Results Radionuclide Concentrations (pCilg)

Background Not Subtracted, 30 min,. count U-238 U-235 Cs-137 Co-60 Total Thorium Other Isotopes Exposure (63Kev, 93 Key (4.4Kev,186 (662 Key) t (1170 Th-228(238 Rate in used when 63 Kev used when Kev+1330 Key), plus

tR/hr at 1 not present) 144 not Key) /2)

Th-232(91 1 meter present)

Key) from Sample ID surface pCi/g pCilg pCilg pCilg pCilg pCi/g Isotope 91 TPE-S-91 1.61 +/- 1.03 0.10 +/- 0.08 ND ND 3.81 +/- 0.49 ND 17 92 TPE-S-92 1.17 +/- 1.07 0.16 +/- 0.06 ND ND 2.67 +/- 0.35 ND 16 93 TPE-S-93 0.81 +/- 0.92 0.19 +/- 0.09 0.12 +/- 0.09 ND 3.72 +/- 0.47 ND 18 94 TPE-S-94 1.72 +/- 0.63 0.18 +/- 0.07 0.06 +/- 0.06 0.05 +/- 0.05 3.42 +/- 0.36 ND 18 95 TPE-S-95 0.97 +/- 0.92 0.19 +/- 0.08 ND ND 3.39 +/- 0.45 ND 17 96 TPE-S-96 1.43 +/- 1.16 0.16 +/- 0.07 ND 0.04 +/- 0.04 3.16 +/- 0.41 ND 17 97 TPE-S-97 1.71 +/- 0.93 0.17 +/- 0.08 ND ND 3.77 +/- 0.42 ND 17 98 TPE-S-98 0.93 +/- 1.12 0.20 +/- 0.07 ND ND 3.01 +/- 0.42 ND 18 99 TPE-S-99 0.87 +/- 0.91 0.10 +/- 0.08 ND ND 3.59 +/- 0.46 ND 17 100 TPE-S-100 1.26 +/- 0.95 0.17 +/- 0.08 ND ND 3.04 +/- 0.44 ND 17 101 TPE-S-101 1.50 +/- 1.00 0.18 +/- 0.09 ND ND 3.57 +/- 0.49 ND 18 102 TPE-S-102 1.58 +/- 0.86 0.23 +/- 0.06 ND ND 3.32 +/- 0.37 ND 18 103 TPE-S-103 1.04 +/- 0.92 0.11 +/- 0.08 ND ND 4.09 +/- 0.46 ND 17 104 TPE-S-104 1.05 +/- 1.06 0.17 +/- 0.08 ND 0.05 +/- 0.05 3.38 +/- 0.38 ND 19 105 TPE-S-105 1.35 +/- 1.06 0.27 +/- 0.09 ND ND 3.66 +/- 0.47 ND 16 106 TPE-S-106 1.40 +/- 0.90 0.20 +/- 0.07 ND ND 3.47 +/- 0.38 ND 17 107 TPE-S-107 1.69 +/- 1.08 0.16 +/- 0.10 ND ND 2.94 +/- 0.49 ND 18 108 TPE-S-108 1.93 +/- 1.50 0.20 +/- 0.08 ND ND 3.93 +/- 0.44 ND 18 T-14

Table 6: Torrey Pines East Land Area Soil Sample Results Radionuclide Concentrations (pCi/g)

Background Not Subtracted, 30 min. count U-238 (63Kev, 93 Key used when 63 not present)

U-235 (l44Kev,186 Key used when 144 not present)

Cs(.37 (662 Key)

Co-60

((1170 Kev+1330 Key) /21 Total Thorium Th-228(238 Kev), plus Th.232(911 Key)

Other Isotopes a

i I

'I I

I nCi/oy riflilo nDi/a poCgi pCi/g pCi g Isotope Exposure Rate in hER/hr at 1 meter from surface 109 TPE-S-109 1.80 +/- 1.08 0.15 +/- 0.11 ND ND 4.09 +/- 0.56 ND 18 110 TPE-S-110 1.41 +/- 0.69 0.24 +/- 0.09 ND ND 3.42 +/- 0.41 ND 17 111 TPE-S-111 1.42_+/-1.37 0.22_+/-0.14 ND ND 3.49-+/-.0.61 ND 17 112 TPE-S-112 1.64 +/- 1.15 0.22 +/- 0.08 0.08 +/- 0.06 ND 3.08 +/- 0.37 ND 17 113 TPE-S-113 2.24_+/-0.79 0.12-+/-0.10 ND ND 3.18_+/-0.50 ND 18 114 TPE-S-114 0.90 +/- 1.03 0.17 +/- 0.07 ND ND 2.51 +/- 0.33 ND 17 115 TPE-S-115 0.97-+/-1.12 0.16_+/-0.10 ND ND 4.02_+/-0.54 ND 17 116 TPE-S-116 1.37_+/-1.10 0.19-+/-0.06 0.06_+/-_0.03 ND 2.64_+/-0.32 ND 17 117 TPE-S-117 1.16-+/-1.01 0.16-+/-0.10 ND ND 3.28-+/-0.41 ND 19 118 TPE-S-118 0.98 +/- 0.98 0.22 +/- 0.09 ND ND 3.15 +/- 0.34 ND 17 119 TPE-S-119 0.84_+/-0.90 0.21 +/- 0.10 ND ND 3.61 +/-_0.52 ND 17 120 TPE-S-120 1.12 +/- 1.01 0.17 +/- 0.05 0.05 +/- 0.04 ND 2.71 +/- 0.34 ND 17 121 TPE-S-121 1.96 +/- 1.20 0.17 +/- 0.09 ND ND 3.71 +/- 0.48 ND 17 122 TPE-S-122 2.26 +/- 1.04 0.14 +/- 0.06 ND ND 3.10 +/- 0.38 ND 17 123 TPE-S-123 1.45 +/- 0.95 0.20 +/- 0.09 ND ND 3.67 +/- 0.48 ND 17 124 TPE-S-124 1.12 +/- 1.19 0.16 +/- 0.07 ND ND 3.11 +/- 0.35 ND 17 125 TPE-S-125 2.15 +/- 1.03 0.24 +/- 0.09 ND ND 3.47 +/- 0.46 ND 17 126 TPE-S-126 1.60 +/- 1.04 0.07 +/- 0.05 0.04 +/- 0.04 0.09 +/- 0.05 2.11 +/- 0.33 ND 16 T-15 p

' 1 1 i *~

" I I 1 " " *

l

(

I I " I I II *I I

Sample ID

Table 6: Torrey Pines East Land Area Soil Sample Results Radionuclide Concentrations (pCi/g)

Background Not Subtracted, 30 min. count U-238 U-235 Cs-137 Co-60 Total Thorium Other Isotopes Exposure (63Kev, 93 Key (144Kev,186 (662 Key)

((1170 Th-228(238 Rate in used when 63 Key used when Kev+1330 Key), plus

[tR/hr at 1 not present) 144 not Key) /21 Th-232(911 meter present)

Key) from Sample ID surface pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g Isotope 127 TPE-S-127 1.58 +/- 0.98 0.18 +/- 0.07 ND ND 3.56 +/- 0.46 ND 18 128 TPE-S-128 2.60 +/- 1.23 0.41 +/- 0.09 ND 0.07 +/- 0.06 3.01 +/- 0.36 ND 19 129 TPE-S-129 2.86 +/- 1.32 0.29 +/- 0.12 ND ND 3.18 +/- 0.48 ND 19 130 TPE-S-130 0.99+/-0.84 0.11 +/--0.06 0.14 +/-0.06 ND 1.79 +/-0.31 ND 15 131 TPE-S-131 1.00-+/-0.89 0.30-+/-0.13 0.36+/-0.10 ND 3.15-+/-0.49 ND 17 132 TPE-S-132 2.31 +/- 0.90 0.17 +/- 0.06 0.06 +/- 0.03 ND 2.75 +/- 0.38 ND 17 133 TPE-S-133 1.26 +/- 1.02 0.15 +/- 0.08 0.05 +/- 0.06 ND 3.35 +/- 0.50 ND 17 134 TPE-S-134 0.78 +/- 0.93 0.12 +/- 0.07 0.12 +/- 0.06 ND 2.75 +/- 0.35 ND 17 135 TPE-S-135 1.37 +/- 1.00 0.10 +/- 0.08 ND ND 2.55 +/- 0.47 ND 17 136 TPE-S-136 2.18 +/- 0.53 0.15 +/- 0.07 ND ND 3.32 +/- 0.40 ND 18 137 TPE-S-137 1.79 +/- 0.82 0.18 +/- 0.09 ND ND 3.48 +/- 0.48 0.06 +/- 0.06 Cs-134 17 138 TPE-S-138 1.32 +/- 1.11 0.20 +/- 0.08 ND ND 2.96 +/- 0.42 ND 17 139 TPE-S-139 1.77 +/- 1.11 0.19 +/- 0.08 ND ND 2.64 +/- 0.46 ND 16 140 TPE-S-140 2.13 +/- 1.04 0.18 +/- 0.06 ND ND 2.59 +/- 0.35 ND 17 141 TPE-S-141 0.87 +/-0.85 0.21 +/- 0.11 ND ND 3.64 +/-0.52 ND 17 142 TPE-S-142 1.83 +/- 1.07 0.24 +/- 0.07 0.04 +/- 0.04 ND 3.02 +/- 0.35 ND 18 143 TPE-S-143 0.82 +/- 0.95 0.09 +/- 0.09 0.06 +/- 0.03 ND 3.03 +/- 0.43 ND 15 144 TPE-S-144 1.55 +/- 1.04 0.11 +/- 0.06 0.03 +/- 0.04 ND 2.08 +/- 0.28 ND 19 T-16

Table 6: Torrey Pines East Land Area Soil Sample Results Radionuclide Concentrations (pCi/g)

Background Not Subtracted, 30 mrin. count U-238 (63Kev, 93 Key used when 63 not present) pCifg U-235 (e44Kev,186 Key used when 144 not present)

Cs-137 (662 Kev)

Co.060 f (1170 Kev+ 1330 Key) 12)

Total Thorium Th-228(238 "Key), plus Th-232(911 Key)

Other Isotopes a

a a

a V

pcilg.

pCi/g

pCi/g pCi/g pCi/g Isotope 145 TPE-S-145 1.39 +/- 0.98 0.18 +/- 0.07 ND ND 3.56 +/- 0.45 ND 16 146 TPE-S-146 1.74 +/- 0.87 0.14 +/- 0.06 ND ND 2.30 +/- 0.32 ND 16 147 TPE-S-147 1.74_+/-1.13 0.19+/-0.08 ND ND 3.34+/-0.49 ND 17 148 TPE-S-148 1.36 +/- 1.16 0.17 +/- 0.06 ND ND 2.51 +/- 0.31 ND 16 149 TPE-S-149 2.48 +/- 1.08 0.16 +/- 0.09 ND ND 3.58 +/- 0.48 ND 18 150 TPE-S-I'50 1.89 +/- 1.07 0.17 +/- 0.06 0.09 +/- 0.05 ND 3.06 +/- 0.32 ND 17 151 TPE-S-151 2.01 +/- 1.36 0.14+/-0.09 0.19 +/-0.11 ND 3.16 +/-0.48 ND 16 152 TPE-S-152 2.55 +/- 0.75 0.18 +/- 0.07 ND ND 2.86 +/- 0.35 ND 16 153 TPE-S-153 1.03 +/- 0.88 0.16 +/- 0.06 ND 0.08 +/- 0.07 2.42 +/- 0.43 ND 15 154 TPE-S-154 1.10+/-0.98 0.17+/-0.06 0.09+/-0.04 ND 1.82_+/-0.27 ND 16 155 TPE-S-155 1.54 +/-0.86 0.09 +/-0.07 ND ND 2.71 +/- 0.37 ND 16 156 TPE-S-156 2.34 +/- 1.22 0.21 +/- 0.07 ND ND 3.32 +/- 0.38 ND 17 157 TPE-S-157 2.09 +/- 1.37 0.23 +/- 0.08 ND ND 3.79 +/- 0.52 ND 16 158 TPE-S-158 1.30 +/- 1.41 0.13 +/- 0.07 0.06 +/- 0.05 ND 2.59 +/- 0.35 ND 17 159 TPE-S-159 1.31 +/-0.97 0.16-+/-0.09 ND ND 3.30 +/-0.42 ND 17 160 TPE-S-160 1.11 +/- 1.00 0.17 +/- 0.06 ND ND 2.53 +/- 0.36 ND 17 161 TPE-S-161 1.94 +/- 1.32 0.13 +/- 0.09 ND ND 3.35 +/- 0.44 ND 17 162 TPE-S-162 3.42+/-1.75 0.18_+/-0.10 0.06_+/-0.06 ND 3.07+/-0.35 ND 17 T-17

1 Sample ID Exposure Rate in

[tR/hr at 1 meter from surface B

1ý

Tablte 6: Torev Pines East Land Area Soil Sample Results T

6 P

P E

U-238 (63Kev, 93 Kev used when 63 not present)

U-235 (l44Kev,186 Rev used when 144 not present)

Cs-137 (662 Rev)

Radionucide Concentrations (pCi/g)

Background Not Subtracted, 30 nin, count Co-60

((1170 Kev+1330 Kev) /21 Total Thorium Th-228(238 Rev), plus Th-232(91 1 Kev) 11 Other Isotopes SI I

I I

t a

n~i/g nCiI

oCihg pCi/g pCilg pCi/g Isotope 163 TPE-S-163 1.55 +/- 0.74 0.22 +/- 0.09 ND ND 2.73 +/- 0.45 ND 16 164 TPE-S-164 2.31 +/- 1.07 0.08 +/- 0.07 ND ND 2.29 +/- 0.35 ND 16 165 TPE-S-165 1.79 +/- 0.61 0.16 +/- 0.08 ND ND 1.95 +/- 0.36 ND 15 166 TPE-S-166 0.82 +/- 0.69 0.13 +/- 0.06 ND ND 1.91 +/- 0.30 ND 16 167 TPE-S-167 1.35 +/- 0.84 0.18 +/- 0.09 ND ND 3.59 +/- 0.52 ND 16 168 TPE-S-168 0.84 +/- 0.76 0.19 +/- 0.09 ND ND 2.27 +/- 0.34 ND 16 169 TPE-S-169 2.03 +/- 0.76 0.09 +/- 0.09 ND ND 2.46 +/- 0.46 ND 15 170 TPE-S-170 1.96 +/- 1.04 0.19 +/- 0.07 0.11 +/- 0.06 ND 2.49 +/- 0.38 ND 17 171 TPE-S-171 1.24 +/- 0.98 0.11 +/- 0.10 0.07 +/- 0.08 ND 2.56 +/- 0.44 ND 15 172 TPE-S-172 1.06 +/- 0.96 0.09 +/- 0.06 0.09 +/- 0.06 ND 1.57 +/- 0.29 ND 14 173 TPE-S-173 1.27 +/- 0.90 0.23 +/- 0.09 ND ND 3.24 +/- 0.57 ND 14 174 TPE-S-174 1.18_+/- 1.00 0.13 +/-0.07 0.11 +/-_0.05 0.04 +/-0.04 1.91 +/-_0.37 ND 15 175 TPE-S-175 1.94 +/- 1.12 0.11 +/-_0.09 0.15 +/-_0.07 ND 2.61 +/--0.50 ND 15 176 TPE-S-176 1.25 +/- 0.60 0.12 +/- 0.06 0.13 +/- 0.05 ND 1.88 +/- 0.31 ND 15 177 TPE-S-177 1.08 +/- 1.01 0.08 +/- 0.07 0.19 +/- 0.07 ND 2.15 +/- 0.40 ND 14 178 TPE-S-178 1.13 +/- 0.50 0.08 +/- 0.06 0.04 +/- 0.04 ND 1.51 +/- 0.31 ND 14 179 TPE-S-179 0.80 +/- 0.72 0.08 +/- 0.06 0.05 +/- 0.06 ND 1.63 +/- 0.38 ND 15 180 TPE-S-180 1.15 +/- 0.87 0.17 +/- 0.08 0.36 +/- 0.07 ND 2.09 +/- 0.35 ND 16 T-18 Sample ID

Exposure Rate in IR/hr at 1 meter from surface I

Y Table 6: Torrey Pines East Land Area Soil Sample Results I-U-238 (63Kev, 93 Rev used when 63 not present)

DCi/Q U-235 (144Kev,186 Rev used when 144 not present)

Radionuclide Concentrations (pCi/g)

Background Not Subtracted, 30 nn. count Cs-137 (662 Key)

Co-60 f{(1170 Kev+1330 Key) /2)

Total Thorium Th-228(238 Kev), plus Th-232(91 I Kev)

Other Isotopes I

I t

t T

DCi/-

pCi/g pCi/g pCGg pCig Isotope 181 TPE-S-181 1.72 +/- 1.37 ND 0.31 +/-0.11 ND 2.96 +/-0.63 ND 17 182 TPE-S-182 1.92 +/- 0.95 0.21 +/- 0.08 1.47 +/- 0.11 0.21 +/- 0.08 2.97 +/- 0.38 0.43 +/- 0.28 Eu-152 18 183 TPE-S-183 1.34 +/- 1.24 0.32 +/- 0.17 3.24 +/- 0.23 0.19 +/- 0.15 5.80 +/- 0.83 ND 17 183 TPE-S-183, 1.65 +/- 0.64 0.23 +/- 0.06 3.00 +/- 0.09 0.11 +/- 0.06 5.57 +/- 0.32 ND 3hour 184 TPE-S-184 1.29 +/- 0.86 0.17 +/- 0.09 0.78 +/- 0.10 0.98 +/-0.14 2.90 +/- 0.43 1.07 +/- 0.25 Eu-152 18 185 TPE-S-185 1.18_+/-0.96 0.22+/-0.11 0.12_+/-0.08 ND 3.34_+/-0.51 ND 17 186 TPE-S-185A 3.70+/- 1.14 0.21 +/-0.09 0.16+/-0.11 ND 3.65 +/-0.56 ND 17 187 TPE-S-186 1.25 +/- 0.44 0.15 +/- 0.04 0.06 +/- 0.03 ND 3.39 +/- 0.23 ND 19 188 TPE-S-187 1.00 +/- 1.04 0.10 +/- 0.07 ND ND 3.72 +/- 0.48 ND 19 189 TPE-S-188 2.58 +/- 1.00 0.21 +/- 0.10 ND 0.70 +/- 0.12 3.56 +/- 0.50 ND 19 190 TPE-S-189 1.01 +/- 0.88 0.20 +/- 0.09 ND ND 3.86 +/- 0.43 ND 19 191 TPE-S-190 1.83 +/- 1.11 0.11 +/- 0.07 0.05 +/- 0.04 ND 2.67 +/- 0.39 ND 19 192 TPE-S-191 1.27 +/- 1.04 0.20 +/- 0.10 ND ND 2.81 +/- 0.46 ND 19 193 TPE-S-192 2.95 +/- 1.30 0.26 +/- 0.09 0.14 +/- 0.08 ND 4.04 +/- 0.52 ND 19 194 TPE-S-193 0.11 +/-_0.04 0.14_+/-0.11 ND ND 2.65 +/-_0.35 ND 19 195 TPE-S-194 2.61 +/- 1.35 0.23 +/-_0.08 0.10+/-0.06 ND 3.36-+/-0.50 ND 19 196 TPE-S-195 0.07 +/- 0.04 0.15 +/- 0.09 ND ND 2.57:+/- 0.35 ND 19 197 TPE-S-196 1.26 +/- 1.22 0.21 +/- 0.08 ND ND 3.54 +/- 0.46 ND 19 T-19 Sample ID H,

Exposure Rate in

[LR/hr at 1 meter from surface i

Table 6: Torrey Pines East Land Area Soil Sample Results Radionuclide Concentrations (pCilg)

___________Background Not Subtracted,_30 min. count U-238 U-235 Cs-137 Co-60 Total Thorium Other Isotopes Exposure (63Kev, 93 Key (l44Kev,186 (662 Kev)

[(1.170 Th-228(238 Rate in used when 63 Key used when Kev+1330 Kev), plus iR/hr at 1 Sample ID not resent) 144 not Ke)/.}

K, 12Th232(911 meter from surface present)

Key) pCi/g pCilg pCi/g pCilg pCi/g pCi/g Isotope 198 TPE-S-196A 1.62 +/- 1.05 0.19 +/- 0.07 ND ND 2.68 +/- 0.42 ND 19 199 TPE-S-197 1.16 +/- 0.45 0.17 +/- 0.07 0.08 +/- 0.06 ND 2.34 +/- 0.39 ND 18 200 TPE-S-198 1.50 +/- 0.98 0.14 +/- 0.08 ND ND 3.25 +/- 0.51 ND 19 201 TPE-S-199 0.09 +/- 0.04 0.16 +/- 0.08 ND ND 2.32 +/- 0.33 ND 18 202 TPE-S-200 1.96 +/- 0.87 0.19 +/-0.07 0.06 +/- 0.05 ND 2.46 +/- 0.45 ND 18 203 TPE-S-201 0.09 +/- 0.05 0.20 +/- 0.08 ND ND 2.34 +/- 0.42 ND 19 204 TPE-S-202 1.20 +/- 0.83 0.17 +/- 0.07 0.13 +/- 0.08 ND 2.97 +/- 0,41 ND 19 205 TPE-S-203 1.72 +/- 1.42 0.19 +/-0.11 ND ND 3.19 +/- 0.51 ND 19 206 TPE-S-204 1.36 +/- 1.19 0.19 +/- 0.07 ND ND 3.20 +/- 0.37 ND 19 207 TPE-S-204A 1.14 +/- 0.97 0.13 +/- 0.06 ND ND 2.68 +/- 0.34 ND 19 208 TPE-S-205 2.17 +/- 1.35 0.15 +/- 0.09 ND ND 3.67 +/- 0.50 ND 19 209 TPE-S-206 3.08 +/- 1.37 0.18 +/- 0.07 ND ND 2.79 +/- 0.43 ND 19 210 TPE-S-207 2.37 +/- 1.09 0.16 +/-0.09 ND ND 2.68 +/- 0.48 ND 19 211 TPE-S-208 1.62 +/- 0.91 0.14 +/- 0.07 ND ND 2.73 +/- 0.43 ND 19 212 TPE-S-209 1.70 +/- 1.23 0.21 +/- 0.09 ND ND 4.02 +/- 0.52 ND 19 213 TPE-S-210 1.36 +/- 0.89 0.14 +/- 0.05 0.07 +/-0.06 ND 2.82 +/- 0.32 ND 19 214 TPE-S-210A 2.24 +/- 1.10 0.17 +/- 0.06 0.06 +/- 0.05 ND 2.73 +/- 0.38 ND 19 215 TPE-S-211 0.74+/-0.80 0.21 +/-0.11 0.11 +/-0.06 ND 3.10+/-0.42 ND 19 T-20

Table 6: Torrey Pines East Land Area Soil Sample Results Radionuclide Concentrations (pCi/g)

Background Not Subtracted,_30 mmi. count U-238 U-235 Cs-137 Co-60 Total Thorium Other Isotopes Exposure (63Kev, 93 Key (144Kev,186 (662 Ke) f{(1 170 Th-228(238 Key)

Rate in S

Iml IUD used when 63 Key used when Kev+1330 plus pRl/hr at I aj.pe not present) 144 not Key) /21 Th-232(911 Key) meter present) from surface pCilg pCi/g

-pCijg pCi/g pCilg pCi/g Isotope 216 TPE-S-212 2.34 +/- 1.26 0.25 +/- 0.10 ND ND 2.91 +/- 0.41 ND 19 217 TPE-S-213 1.39 +/- 0.98 0.09 +/- 0.08 ND ND 3.22 +/- 0.51 ND 19 218 TPE-S-214 1.21 +/- 0.90 0.21 +/- 0.08 ND ND 2.66 +/- 0.32 ND 19 219 TPE-S-215 1.32 +/- 1.06 0.20 +/- 0.10 ND ND 3.80 +/- 0.54 ND 19 220 TPE-S-216 1.38+/-1.14 0.18-+/-0.12 1.43+/-0.14 0.22+/-0.11 3.26_+/-0.53 ND 18 221 TPE-S-216A 2.76+/- 1.36 0.21 +/-"0.13 0.71 +/-_0.11 0.14_+/-0.13 3.37"+/-0.52 ND 18 222 TPE-S-217 0.86 +/- 0.59 0.08 +/- 0.07 ND ND 1.65 +/- 0.37 ND 16 223 TPE-S-218 1.70 +/- 1.13 0.12 +/- 0.09 0.29 +/- 0.09 ND 4.04 +/- 0.53 ND 17 224 TPE-S-218A 2.30 +/- 1.30 0.21 +/- 0.11 ND ND 4.06 +/- 0.56 ND 17 225 TPE-S-219 1.59 +/- 1.09 0.16 +/- 0.11 2.79 +/- 0.17 ND 3.72 +/- 0.47 ND 18 226 TPE-S-219A 1.74 +/- 1.27 0.19 +/- 0.09 0.63 +/- 0.12 ND 3.62 +/- 0.60 ND 18 227 TPE-S-220 1.68 +/- 1.22 0.20 +/- 0.09 2.36 +/- 0.14 ND 3.67 +/- 0.53 ND 17 228 TPE-S-220A 1.73 +/- 1.32 0.18 +/- 0.10 0.25 +/- 0.08 ND 3.99 +/- 0.52 ND 17 229 TPE-S-221 1.57 +/- 0.62 0.16 +/- 0.09 ND ND 3.26 +/- 0.41 ND 17 230 TPE-S-221A 2.12 +/- 1.26 0.20 +/- 0.09 ND ND 3.49 +/- 0.57 ND 17 231 TPE-S-222 2.06 +/- 1.17 0.23 +/- 0.07 ND ND 2.71 +/- 0.39 ND 19 232 TPE-S-222A 0.87 +/-1.02 0.17 +/- 0.09 ND ND 2.89 +/- 0.45 ND 19 233 TPE-S-223 1.72 +/- 1.13 0.17 +/- 0.11 ND ND 3.49 +/- 0.65 ND 20 T-21

Table 6: Torrey Pines East Land Area Soil Sample Results Radionuclide Concentrations (pCi/g)

Background Not Subtracted. 30 mini. count U-238 U-235 Cs-137 Co-60 Total Thorium Other Isotopes Exposure (63Kev, 93 Key (144Kev,186 (662 Key)

[(1170 Th-228(238 Rate in

used when 63 Key used when Kev+1330 Key), plus I.Rhr at I not present) 144 not Key) /12 Th-232(9 1 I meter present).

Key) from Sample ID surface pCilg pCilg pCilg pCi/g pCilg pCilg Isotope 234 TPE-S-224 1.48 +/- 0.96 0.12 +/- 0.09 ND ND 1.42 +/- 0.39 ND 15 235 TPE-S-225 0.98 +/- 0.99 0.19 +/- 0.09 0.98 +/-0.11 0.09 +/- 0.08 2.87 +/- 0.52 ND 20 236 TPE-S-226 0.87 +/- 1.02 0.16 +/- 0.09 1.07 +/- 0.12 0.70 +/- 0.12 2.74 +/- 0.47 ND 19 Samples with the letter "A" suffix are sub-surface samples (6"-12"). All others are surface samples (0-6").

ND = Not detected, <0.1 pCi/g Cs-137, <0.1 pCi/g Co-60, <3.0 pCi/g U-238, <0.3 pCi/g U-235 T-22 Notes:

1.

2.

Figure 1: Torrey Pines (Main) Site Land Areas Bunker Yard IV LINAC Bldg. 21127 Utility Pad HOT CELL SITE TORREY PINES NORTHEAST 25 Yard 1IGA

& Land TORREY PINES EAST TFF

/

TORREY PINES SOUTH S

Figure 2 : Torrey Pines East Land Area Torrey Pines East Land Area 1

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 17 I..

drainage collection M

depression K 1storm 1

idrain pipe I

JI I

I Hi G

E N

D C,

B 1

/

C-.

Hot Ceif Storage Yhrd T-storm dr pipe S.....,,....

CI E

4'

-I (I

-I

- I.

ale I I

If

'A I.

I/I "I

9' I /

Pa king Lo

-I-I 1

1 1

1 I

I I

I Truck iStaging Ara I

1

.Parking Lot

-

I

-I L

N' I_.

10 meters Figure 2 O

° 18 i

I L

I

-u

-k

-- I

-I Torrey Pines East Boundary

=

I

)t

[

I I

i

1 2

3 N

drainage aspnalt collection M

depression L

K K:

storm drain pipe S.

II JI 4

G E

I HI N

E E

Fl

(

C 10 meters 4

5 6

7 8

9 soil Figure 3 : Torrey Pines East Land Area Classifications Torrey Pines East Land Area soil Hot Cell Sto rage y.rd 1I

'~,I w++

10 11 12 13 14 15 16 17 8

soil soil soil

.3/

storm-dra pipe S.

....--F S

i.

-c6ncr~te ditch

.H --..

scale asphalt I

f Pa king Lot

-J I

I 2

+

1 4

I

-

.I Truck j......

iStaging Area I

I Parking Lot E7 I-1

+1 Area Classifications Suspect Affected Non-Suspect Affected Non-Impacted Unaffected Figure 3 IME1-1tlt----

l

ý I S+

soil S/oil

+

I I

ME

v' Jn6l!

1O-LI-60 01 WO-te-LO

saG1C IllMOIS ' U lIOOd "d :Aq pai1npuoo SAgAJnS pu uo!polaoI leuw!xoJdde al selouec] *- xx-x -*

'pOuueos saoepns Lqdse Glq sseooe n

qjao lle jo %0 ['

'so3elins lelew puP UP JOUO3 O leS )1lnJl eq uo pue seaie papetqs =

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wd u

09-0 woJJ 6uej slinsai ueos eiqdlV eqdle wd3 u! sa6ueJ eje s6u!pieJ iV

'11

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41 I --

siaolw 04 S.........

.............'.......... 4-....... -........

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---- ----- 1-4 ---------

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041 0410k 4---

/ Ijv u

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0v-0 i

L is 000 0"

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101 buOl 000-0 ko q' ouoad, U6 u

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did uioip.

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-4 4

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uoissoidoe LA abeup N.

sjlnSl: pue suoleoo-I suauwJanseal/ ueos eqdlV : V ajnBi-L

---I.

i-

-I

Figure 5:

Beta Scan Measurements Locations and Results Torrey Pines East Land Area 1

2 3

4 5

6 7

8 9

10 11 12 13 14 15 16 N

drainage collection M

depression L

K J

.H D!

C B

/i

'I Note: 5 Note: 5 storm drain pipe I

S E Hot C Storage I

m S10 meters

'ell storm dr

-pipe S

I w.............t......

S If 1000-1300 (metal) 2100-2400 (concrete)

A/1 L

j I-1

con crdte ditct scal.......

e Pa king Lot Truck I Staging Arpa.

00 Parking Lot I -

I 5'

17 18

]

hi Notes:

1. All readings are ranges in cpm Beta.

2. 100% of accessible asphalt and concrete surfaces scanned in the Suspect Affected, =shaded, areas and on the truck scale concrete and metal surfaces.

3. 10% of all other areas scanned. *--xxxx-xxxx -- 4 Denotes approximate scan location and range.

4. Maximum results were 3400 cpm (asphalt),

2800 cpm (concrete) and 1300 cpm (metal).

--5. Two areas in the concrete drainage ditch with the highest scan results were checked with a 100 cm2 1

beta detector. Fourteen 2 minute fixed beta I

measurements were taken with the maximum result of < MDA (313dpm/100cm 2).

Surveys Conducted by: R. Stowell & P. Poole Dates: 08-01-01 to 09-17-01 Figure 5 scale

Figure 6 : Exposure Rate Scan Measurements Locations and Results Torrey Pines East Land Area 1

2 073 S1 1

N, L +

.. }........

17-2....... 17....

........- "'20..........

1 drainage collection M

depression 20 6 ftK K

Pi 4

16-18 17-19 i

16-1!

20-22/

pipe storm 5

6!

r 16-18 16-18 17-19 16-19 17-19 17-197 9 12 27 9

13-21 inside overfloy drain

_Hot !el Storage Y rd storm dra.

pipe I

F!

E Dl B

pipe

+-1 N

H-10 meters 10mters 7

89 10 11 12 13 14 N

15 16 17

-4 ~

1 18 S.

i!

1 i

14-17 16-18

-15 19 I

15-18 16-18 15-19 1

15-19 14-17 1-1 SI II 14-171 55-191 115-18 1

1.19 16-18 I I 118 1

15-19 1-7 1

15-18 14-17 17-19 I

1 1, -18 915-1 8

9 1.1-i 15-17 S16-186 16-18 i

16-19

-.'A*P'+-"-"

17-19 1 2 16-19 1.1520

"""---17

.19 1

o*

I 17-19 :

\\

15-18' 15-18

+

15-17 I

/I 16-19

.213-18 19 1

18-21

/

8-17 15-21

/JI) 1 013-13-17 14-117221 18-22 CI 1

2-9 1319-22

'19

-%20 18-22 1-22 1

7-1"/

1-1' 12

-I I

..I, I

18-21 I

Paaking Lotr/i I

/

It 1*2 S.

...... I.

......................L l_

T f u o !

c 4,*

S Staging Area Ii I

I

/,

S........ +......

............ I.......... !..........

..Parki~g Lot-..

SI I

1T I

I I

1l I

I i

I I

li I

I I

I!!

1 I

II i

II I

I II I

I I

Figure 6 21-22 19-22 18-21 18-20 19-21 17-20 1--

I

,A.

Notes:

1. All scans were at - 1linch above the surface and are shown as ranges in ItR/hr.

2. 25% of the surface scanned in the shaded LI, Unaffected and Non-Impacted areas.

3. 100% of the surface scanned in the Suspect Affected and Non-Suspect Affected areas.

-4. Scan results range from 8-23 iR/hr.

Surveys Conducted by: R. Stowell & P. Poole Dates: 06-25-01 to 09-13-01 W

-I I

i

Figure 7 : Fixed Exposure Rate Measurements Locations and Results Torrey Pines East Land Area 1

2 3

4,5 6

7 8

9 10 11 12 13 14 15 17-19 17-19 18-19 18-19 1"

7-1,.

17-19 17-19 17-19 17-19 16-19 17-18 17-19 16-18 N;

L K

Jt H'

Fl E

D C

B 16-17 16-17 16-17 16-17 p17-18, 16-17 17-19

!17-18 16-17 16-17 15-1 17 117 17 16-18 16-17 17 I

i.

17-18 16-17 16 16-17 1

-9 17-19 I

"/

15-18 14-16 16 I

i scale 1*

A Pa king Lot Truck 1StagingArea 18-19 17 17-19 17a Parking Lot 7-19 7-19 18-19 18-20 18-19 17-18 17-19 17-18 16 17 18-19 Figure 7

,I.

K I-u I

4 I

1 F

ii ii I

Olepression 16 17

-n pipe storm drain p 18 Hot Celi

,StorageY,_r*r*t storm dr

-.. p i p e N

'I w

10 meters Notes:

1. All readings are in fiR/hr taken at - 1 meter above the surface. Results range from 13-20 ptR/hr.

2. In the Unaffected and Non-impacted, E

shaded, areas one measurement was taken for every 20m2 (5/1OOm 2).

3. In all other areas, Suspect Affected and Non-Suspect Affected, one measurement was taken for every 4m 2 (25/1 00m2).

Surveys Conducted by: P. Poole & R. Stowell Dates: 08-03-01 to 10-15-01 I

I

Figure 8: Soil Sample Locations Torrey Pines East Land Area S 1 !

2 3

i 4

N,

depression 1

I N

K istorm i

idrain pipe I

I HI I

I I

F I

N E

B 10 meters S 11 181 20 i.

171 22 12 10 16 25 S

6 19 211 32 231 34 24 218 26 37 281 39 29 183 30 42 ~

7 31 55 331 56 5

351 58 5

36 60 38 61 6

1 40, 41 43 63 66 8

74 91 575

/

I 59 176/

I 220 92 i2 771 z

/ "78 I-64 179 65 1

81 67182 S.

.F.........

45 68 69J84

~

i 8786 80 83 85 10 11 12 13 135 145 105 118 145 132 134 15t 136 133 1371 I

119*

I 146 It 10614 I 138 13s 147 148 I

140 149 150 120 1

1159 107 20 41151 1

109 1

41 1111121 1221 I

I 112 1

1 I

142 152 1

114 125ý l

116 1126 127 I

12 1289 /

15 117 19143 I

153 14 15 16 155 51 "15 158 160 161 165 166 167 stprm-1 p1 4- -

.....s..... -I Y,

L I I ditch inside I

!storm I

--deirr-pipe- --l -

I I

V I

.1-I..........scal~e" '

-I I

I I

I Paiking Lot iStaging Arga I

T I

I

..Parkihg-Lot...

A 1

17 7.....

.1....

T

r I

I 1

V

.1 1

1.

I T

8

. Notes:

1. XX) app

2.

XX, I

at i S.....

2 18 1 3.

Cor I

anm

4.

Soi I

Sample Dates:

es Collected by: R. Stowell & P. Poole 08-21-01 to 09-13-01 Figure 8 t

X Denotes surface sample 0"-6", ID number and roximate location.

IX Denotes a dual sample, 0"-6" and 6-12" collected remediation sites. Samples 185, 196, 204, 210, 216, 8, 219, 220, 221 & 222.

rmplete sample ID number - TPE-S-XXX for 0"-6' id TPE-S-XXXA for6V-12".

I sample results are provided in Table 6.

162 I I

ýin.we II

a)

LL-CJ) 0 Cu C

E 0

0 E

.Q 0

cu 0

E cc "a) cc "0

cn cc LL Cu E

E 2

C)J v E CuL 0

0.

0 E v co Cu cis CL co Ca)

MCul U-E CL C~)

CuYu Cuj -t (D

pu.

Cucn en0 co C/u ca

-C 0

0 U

Cu Cu 0 =

-C1 a>

0 Cu cuu C.)

Xu CD CL 0

_u 0

cCO C6 2

Al E

0 0

E 0.n CL C

Cu E

cu cu U

Cu Cý cu C) c 0

CL 0

o C)

~C) oE C>~

.E "*o

o Cu -V E

Dcu o

(D Cucm

E 0

o* 'C cu E

co CuL Cu o -

C" Cu CuC Cu I-

-o 0

0.

Cu Cu (1)

C 0

CL Cu 0

0 07~

. 0 0

C

'U

-j U) m C',

3-0 F-1O ca 0)

Cu Cu C.)

0 0

(D Cn (1)

E C)

Co G) 0)'

0

()

CNj

-j b

0

Figure 10 : Truck Staging Area Fixed Measurements and Removable Contamination Survey Torrey Pines East Land Area 11 12 13 4-- - -- -- - -- -- - -- -- - -- - --- - -- -- - -- -- - -- -- - -- -- - -- -- -

13

---

a13 1313 13 N- \\

13

*13 o1 03 a

1 OC a

CC aU a(X G 0130

~130a 397 a

a a

13 0

oa13

/

13,'/

/

13 0,"/

/

Notes:

1.

cc Denotes Fixed Alpha Measurement location.

All Alpha results were

< MDA, 218 dpm/100 cm2.

2.

P3 Denotes 2 Minute Fixed Beta Measurement location < MDA, 358 dpm/100 cm 2.

3. XXX Denotes Fixed Beta Measurement in dpm/100 cm2 > MDA.

Maximum Beta result was 397 dpm/100 cm2.

0

4.

Denotes wipe location. Maximum wipe results were < 10 dpm/100lcm2 Alpha and 22 dpm/100 cm2 Beta.

5.

Wipe Results are provided in Table 5.

Surveys Conducted by: P. Poole & R. Stowell Dates: 08-03-01 to 08-06-01 N

asphalt Oa a

\\

/

N--I Truck Staging Area a3 E/

/

13

/

Figure 10 10

'11 E

S N

W H

G 10 METERS

ýtý

-7**-

I

Figure 11 : Parking Lot Fixed Measurements and Removable Contamination Survey 8

35 E

Wk 10 meters 9

Torrey Pines East Land Area Parking Lot cx 10 11 12 13 aspha 14 ax

Lt 15 o/

(X p3 62

'S cx

(,,'

.5 16 f............------

....---................4 Area o

Cc" 473 13 oc Ix 13

\\

"- N "\\., 3\\.

17 K,18 H

J Notes:

1. (x Denotes Fixed Alpha Measurement location. All Alpha results were < MDA, 218 dpm/100 cm2.

2.

3 Denotes a 2 Minute Fixed Beta Measurement location. All Beta results were < MDA, 358 dpm/100 cm2.

3. 0 Denotes wipe location.

Maximum wipe results were

< 10 dpm/100 cm 2 Alpha and 11 dpm/100 cm 2 Beta.

4. Wipe results are provided in Table 5.

Surveys Conducted by:

P. Poole Dates: 08-06-01 to 08-07-01 Figure 11 G

F E

D C

F LL----.................

.. 7 - -- Z- -

L ----------------------

ocx U8

Figure 12 : Truck Scale Fixed Measurements and Removable Contamination Survey Torrey Pines East Land Area 9

8 10 meters Notes:

1. a Denotes Fixed Alpha Measurement location. All Alpha results were

< MDA, 218 dpm/100 cm2 (metal & concrete).

2. p Denotes Fixed Beta Measurement location. All Beta results were

< MDA, 171 dpm/100 cm2 (metal), 313 dpm/ 100 cm 2 (concrete).

3.6 Denotes wipe location. Maximum results of wipes were < 10 dpm/100 cm2 Alpha and < 10 dpm/100 cm2 Beta.

4.

Wipe results are provided in Table 5.

Survey Conducted by: P. Poole Date: 09-17-01

Appendix A Final Radiological Survey Plan for Torrey Pines East Land Area to General Atomic's Final Radiological Survey Report For Torrey Pines East

Page 1 of 4 June 25, 2001 Iij'A

i~l, Prepared By: W. T. L Wt'e Approved By:

0,L~~~

~ y o' Apoe L.Q. Gonzales Final Radiological Survey Plan for Torrey Pines East Land Area This Final Survey Plan is for Torrey Pines East Open Land area. This parcel of land, which is approximately 82,000 ft2 (-7,600 M 2), includes the land area used to temporarily store D&D materials awaiting release to unrestricted use/disposal(soil, asphalt, concrete, metal panels, re-bar, etc.), known as the Soil Staging Area (SSA), and a portion of land used to store radioactive material from the former Hot Cell Facility and to evaporate water from a Hot Cell pit that filled with rain water, see Figure-1 for Torrey Pines East location and Figure-2 for classification and grids.

This Final Radiological Survey Plan covers only open land areas, portions of which are paved with asphalt.

History and Classification In December, 1998, a large portion of this land area was established as a controlled storage area for D&D materials generated at the many GA D&D projects until unrestricted use/disposal for this material was granted by the NRC and/or the State of California. The material stored in this area was surveyed and released prior to removal from the originating site. Prior to this date, the majority of this land area had no history of use or storage of radioactive material. In 1999, during a confirmatory survey of the soil removed from the former Hot Cell Facility (HCF) site identified elevated activity levels in the form of Cs-137 and Co-60 hot particles. The area where the HCF soil was stored was posted and controlled as containing radioactive material. This soil was subsequently disposed of as radioactive material.

A portion of this Torrey Pines East land area was enclosed by the HCF Controlled Area and used to store radioactive material awaiting dispositioning (packaging and disposal as radioactive waste, or, survey and release). This area was also used to evaporate rain water that collected in an excavation pit.

within the former HCF site. This water contained slightly elevated levels of Cs-137 and Co-60 and was allowed to naturally evaporate in large open containers. The evaporated sludge was packaged and disposed of as radioactive waste.

The portions of this parcel of land that were impacted by the former HCF material storage and use are classified as Suspect Affected Areas (approximately 36,000ft2, or 3,300 m2). The portion of land used to load and survey transport vehicles for the former HCF soil shipments is classified as a Non-Suspect Affected Area (approximately 7,500 ft2 or 700 m2). The remaining portions of land are classified as Unaffected and Non-Impacted Areas. See Figure-2 for details.

W:Torrey Pines East.wpd A-1

Page 2 of 4 Survey Objectives and Responsibility The purpose of performing a final survey is to demonstrate that the radiological conditions within the Torrey Pines East Land Area satisfy the NRC and State of CA guidelines for release to unrestricted use.

The objectives include (1) to show that the average surface contamination levels for each survey unit are within the authorized value, (2) to show that the maximum residual activity ("hot spot" area) do not exceed three times the average value in an area up to 100 cm2 and (3) that a reasonable effort has been made to clean removable contamination and fixed contamination and (4) that the exposure rates in occupiable locations are less than 10 [IR/hr above background measured at 1 meter above the surface.

Samples will be counted in the Health Physics laboratory (onsite). Surveys will be taken only by qualified Health Physics Technicians having a minimum of 3 years Health Physics Technician experience. The survey and final report documenting the survey will be performed by GA's Health Physics group.

Release Criteria (per GA Site Decommissioning Plan)

Concrete/Asphalt Surface Release Criteria The predominate isotopes associated with the former HCF are the Fission product Cs-137, the Activation product Co-60. The NRC release criteria for mixed fission and activation products is:

5,000 dpm /100 cm 2, averaged over a 1 m2 area 15,000 dpm /100 cm2, total, maximum in a 100 cm 2 area 1,000 dpm/100 cm2, removable activity Exposure Rate Measurements The guideline value for exposure rates measured at 1 m above the surface, is 10 pR/hr above background.

Alert Levels Alpha Alert Values If the following "alert levels" are exceeded, notify HP Management so an evaluation can be performed and to evaluate if decontamination is required.

> 100 cpm alpha using the large area (434 cm 2) probe (check area with a hand-held alpha meter).

> 60 cpm using a 50 cm2 hand-held alpha probe (- 600 dpm/100 cm 2)

Beta Monitoring

>300 cpm above the appropriate background using the 434 cm2 probe.

>200 cpm above the appropriate background using the 100 cm2 probe.

>150 cpm above background using a portable GM detector.

W:\\Torrey Pines East.wpd A-2

Page 3 of 4 Exposure Rate Measurements

> 25 [tR/hr at surface

> 20 pR/hr at 1 m Documentation Every survey conducted must be documented on a daily basis on a drawing showing the approximate locations surveyed. Include the results (including units), the technicians signature, date, instrument(s) used (including model and serial number of both the ratemeter and the detector), calibration due date,

% efficiency, background readings (if applicable) and any other applicable information.

W:\\Torrey Pines East.wpd A-3

Page 4 of 4 Final Radiological Surveys Planned for the Torrey Pines East Land Area I Unaffected and Non Type of Survey/Activity Suspect Affected Area Non-Suspect Affected Area I

I I

Impacted Areas Gridding Required?

Yes No No Asphalt or Concrete Surfaces (1) 100%

100%

10% of paved surfaces (Scan w/ 434 cm 2 alpha probe).

Asphalt or Concrete Surfaces (1) 100%

100 %

10% of paved surfaces (Scan w/ 434 cm 2 beta probe).

Minimum number of 1 measurement per 4 M2, or, 1 measurement per 20m2, or, 1 measurement per 20m2, or, Measurements (2) (3) 1 measurement every -2 m 1 measurement every -4 m 1 measurement every -4 m Alternate between (1) a wipe, (2) an alpha Alternate between (1) a wipe, (2) an Alternate between (1) a wipe, (2) fixed measurement and (3) a beta fixed and alpha fixed measurement and (3) a beta an alpha fixed measurement and alpha fixed measurement on all asphalt or fixed and alpha fixed measurement on (3) a beta fixed and alpha fixed concrete surfaces.

all asphalt or concrete surfaces.

measurement on all asphalt or concrete surfaces.

[IR/hr Readings 100% scan on all surfaces, detector held 100% scan on all surfaces, detector held 25% scan in all areas.

-1" from surface

-1 from surface Soil Samples 124 as shown on Figure-3 8 as shown on Figure-3.

66 as shown on Figure-3.

Drainage Area 100 % Scan using a microR meter all drainage areas within the Torrey Pines East Land Area.

Collect soil samples in any silt accumulation area. Perform Exposure rate survey approximately 6 ft into each end of any storm drain line found.

[tR/hr Readings I every 2m I every 4 m

@.lm from surface (1)

(2)

(3)

Clean surfaces to remove debris or dirt.

For the fixed measurements:

For ac measurements; use either the hand held alpha counter (minimum of -6 second count). Document all readings in cpm.

For P3 measurements; take a 2 minute count using the 100 cm2 gas flow proportional detector (beta) with the Model 2221 ratemeter.

Document all readings and mark on a drawing the locations the readings were taken.

For wipes, analyze each 100 cm2 wipe for cc and P3 activity.

A "measurement" is either (1) a "fixed" radiation measurement representing total activity or (2) a wipe (removable activity).

W:\\Torrey Pines East.wpd A-4

Figure 1: Torrey Pines (Main) Site Land Areas Bunker Yard N

LINAC Bldg. 21127 Utility Pad HOT CELL LAND TORREY PINES "NORTHEAST Bldg.

Yard TORREY PINES WEST KTRIGA Reactors

& Land

--V I

TORREY PINES EAST "TFF UTILITY CORRIDOR CENTRAL TORREY PINES SOUTH S

\\N A-5

t3 t

'l L _!;

J~

li Ii

'~

-ir- *,...

CP S........ ',...

0- I

<i.

4, -- -- -- --

I

S.........--------

L.

S L I..

S...

.',t

.~-

S..........

..........*.... -1 i........i................ *.....el S...

Aý --

I,

,i

~~~~~-----

o v

i'

Appendix B "Confirmatory Survey Plan for Torrey Pines East Land Area" to General Atomics' Final Radiological Survey Report For Torrey Pines East

GA'S CONFIRMATORY SURVEY PLAN FOR TORREY PINES EAST (TPE) LAND AREA B-1

Page 1 of 3 October 11,2001 Prepared By: W. T. LaBont Approved By:

a(uQO.

t_ }

to

(

L. Q. Gonzales GA Confirmatory Survey Plan for Torrey Pines East Land Area This Survey Plan is for the GA Confirmatory survey of the Torrey Pines East Open Land area. This parcel of land, which is approximately 82,000 ft2 (-7,600 M2), includes the land area used to temporarily store D&D materials awaiting release to unrestricted use/disposal(soil, asphalt, concrete, metal panels, re-bar, etc.), known as the Soil Staging Area (SSA), and a portion of land used to store radioactive material from the former Hot Cell Facility and to evaporate water from a Hot Cell pit that filled with rain water, see Figure-1 for Torrey Pines East location and Figure-2 for classification and grids.

This Survey Plan covers only open land areas, portions of which are paved with asphalt.

History and Classification In December, 1998, a large portion of this land area was established as a controlled storage area for D&D materials generated at the many GA D&D projects until unrestricted use/disposal for this material was granted by the NRC and/or the State of California. The material stored in this area was surveyed and released prior to removal from the originating site. Prior to this date, the majority of this land area had no history of use or storage of radioactive material. In 1999, during a confirmatory survey of the soil removed from the former Hot Cell Facility (HCF) site identified elevated activity levels in the form of Cs-137 and Co-60 hot particles. The area where the HCF soil was stored was posted and controlled as containing radioactive material. This soil was subsequently disposed of as radioactive material.

A portion of this Torrey Pines East land area was enclosed by the HCF Controlled Area and used to store radioactive material awaiting dispositioning (packaging and disposal as radioactive waste, or, survey and release). This area was also used to evaporate rain water that collected in an excavation pit within the former HCF site. This water contained slightly elevated levels of Cs-137 and Co-60 and was allowed to naturally evaporate in large open containers. The evaporated sludge was packaged and disposed of as radioactive waste.

The portions of this parcel of land that were impacted by the former HCF material storage and use are classified as Suspect Affected Areas (approximately 36,000ft2, or 3,300 m2). The portion of land used to load and survey transport vehicles for the former HCF soil shipments is classified as a Non-Suspect Affected Area (approximately 7,500 ft2 or 700 m2). The remaining portions of land are classified as Unaffected and Non-Impacted Areas. See Figure-2 for details.

W:\\Torrey Pines East.wpd B-2

Page 2 of 3 Survey Objectives and Responsibility The purpose of performing a confirmatory survey is to verify the radiological conditions measured during the Final Survey of the Torrey Pines East Land Area.

Release Criteria (per GA Site Decommissioning Plan)

Concrete/Asphalt Surface Release Criteria The predominate isotopes associated with the former HCF are the Fission product Cs-137, the Activation product Co-60. The NRC release criteria for mixed fission and activation products is:

5,000 dpm /100 cm2, averaged over a I M2 area 15,000 dpm /100 cm 2, total, maximum in a 100 cm 2 area 1,000 dpm/100 cm 2, removable activity Exposure Rate Measurements The guideline value for exposure rates measured at 1 m above the surface, is 10 ýIR/hr above background.

Alert Levels Alpha Alert Values If the following "alert levels" are exceeded, notify HP Management so an evaluation can be performed and to evaluate if decontamination is required.

> 100 cpm alpha using the large area (434 cm 2) probe (check area with a hand-held alpha meter).

> 60 cpm using a 50 cm2 hand-held alpha probe (- 600 dpm/1 00 cm2)

Beta Monitoring

>300 cpm above the appropriate background using the 434 cm2 probe.

>200 cpm above the appropriate background using the 100 cm 2 probe.

>150 cpm above background using a portable GM detector.

Exposure Rate Measurements

> 25 ILR/hr at surface

> 20 p.R/hr at 1 m Documentation Every survey conducted must be documented on a daily basis on a drawing showing the approximate locations surveyed. Include the results (including units), the technicians signature, date, instrument(s) used (including model and serial number of both the ratemeter and the detector), calibration due date,

% efficiency, background readings (if applicable) and any other applicable information.

W:\\Torrey Pines East.wpd B-3

Page 3 of 3 GA Confirmatory Radiological Surveys Planned for the Torrey Pines East Land Area Clean surfaces to remove debris or dirt.

For the fixed measurements:

For a measurements; use either the hand held alpha counter (minimum of -6 second count). Document all readings in cpm.

For P3 measurements; take a 2 minute count using the 100 cm 2 gas flow proportional detector (beta) with the Model 2221 ratemeter.

Document all readings and mark on a drawing the locations the readings were taken.

For wipes, analyze each 100 cm2 wipe for a and P3 activity.

(3)

A "measurement" is either (1) a "fixed" radiation measurement representing total activity or (2) a wipe (removable activity).

B-4 WATorrey Pines East.wpd SusectaAffectedAreadINTn Type of Survey/Activity Suspect Affected Area Non-Suspect Affected Area affected and Non Gridding Required?

Yes No No Asphalt or Concrete Surfaces (1) 10 % of paved surfaces 10 % of paved surfaces 10% of paved surfaces (Scan w/ 434 cm2 alpha probe).

Asphalt or Concrete Surfaces (1) 10 % of paved surfaces 10 % of paved surfaces 10% of paved surfaces (Scan w/ 434 cm2 beta probe).

Minimum number of 1 measurement per Grid 1 measurement per grid 1 measurement per grid Measurements (2) (3)

Alternate between (1) a wipe, (2) an alpha Alternate between (1) a wipe, (2) an Alternate between (1) a wipe, (2) fixed measurement and (3) a beta fixed alpha fixed measurement and (3) a beta an alpha fixed measurement and measurement on all asphalt or concrete fixed measurement on all asphalt or (3) a beta fixed measurement on surfaces.

concrete surfaces.

all asphalt or concrete surfaces.

.,R/hr Readings 10% scan on all surfaces, detector held -1" 10% scan on all surfaces, detector held 10% scan in all areas.

from surface

-V1 from surface Soil Samples 20 as shown on Figure-3 2 as shown on Figure-3.

13 as shown on Figure-3.

Drainage Area 100 % Scan using a microR meter all drainage areas within the Torrey Pines East Land Area.

hR/hr Readings 1 in center of every grid I in center of every grid

@, 1 m from surface (1)

(2)

Figure 1: Torrey Pines (Main) Site Land Areas 0

HOT CELL LAND TORREY PINES NORTH rORREY PINES NORTHEAST LINAC TORREY PINES

/

TORREY PINES EAST "TFF UTILITY CORRIDOR CENTRAL TORREY PINES SOUTH B-5 N

S

Figure 2 : Torrey Pines East Land Area Classifications and Grids Torrey Pines East Land Area 16 17 18 i L I

I dra Coll M

epI

-I I

JI dr' F.......'

o LIZiiiiiiiiiii Area Classifications Suspect Affected Non-Suspect Affected Non-Impacted Unaffected I

I I- -

-.

F

/

1t 2

3 4

5; 6;

7 I

8 i

10 11 12 13 14 15 1-----I I

I I

C:

B B-6

Figure 3: Torrey Pines East Land Area Confirmatory Soil Sample Locations Torrey Pines East Land Area 3

i 4

5 6

1 7

8 9

10 11 1

/1 II 1 o l 1

I 13 if OK I-;

N' drain colle(

M depreE K I 14 0

0::-*

F 15 16 I---

I---

L SI I

@1 II S..

..... 1..

I --

1 II I

II

~Pa~kingL II I

I I --

nt I I I

I I

I Truck S.

.. IStag ingAr.a II II I

I I

4---

IS

-J Parkinlg Lot L

I

I I

,--

1-

I

1 I

17 18 4-

-

L I

I I

1 I

I I

I

--I.

1 I

I I ---

-I I

I I

I 1- -

H L

0 Soil sample location

-- - I IL.

B-7 1a 2

L 0

I I

I

-I 0

m--H----

-pipe--

-I---

E

- I S

F'

-- I Cl n

I I

4---

I I

I __

I I

I b

ters r

-I-

+/-

I I

I F

I I

S........L....

2

! i II I

RESULTS OF GA'S CONFIRMATORY SURVEY FOR TORREY PINES EAST (TPE) LAND AREA B-8

Final Radiological Survey Report for Torrey Pines East Land Area B-9

+GENERAL ATOMICS GA Confirmatory Survey Results for the Torrey Pines East (TPE) Land Area Description Following the completion of the Torrey Pines East Land Area Final Survey, a Confirmatory Survey was performed by a Health Physics Technician, not associated with the Final Survey, in accordance with an approved Survey Plan (attached). The Torrey Pines East Land Area is illustrated in Figure 1.

The purpose of this survey was to confirm that the Final Survey was effective in identifying the radiological conditions of the area and demonstrating that the results are within the allowable limits for release to unrestricted use.

Survey and Results The Torrey Pines East (TPE) Land Area internal confirmatory survey consisted of:

1.

The collecting of 35 surface (0-6") soil samples. Gamma spectroscopy analysis showed concentrations ranged from 0.14 +/- 0.10 pCi/g to 0.43 +/- 0.30 pCi/g for 235U.

Concentrations ranged from ND (Not Detectable) to 0.12 +/- 0.07 pCi/g for 137Cs. See Table 1 for results and Figure 4 for locations.

2.

Exposure rate measurements taken 1 meter from the surface at 88 different locations.

Theses ranged from 15 to 21 I.LR/hr at 1 meter from the surface. In addition, exposure rate measurements were taken at contact and 1 meter from the surface at each of the 35 soil sampling locations. The contact measurements ranged from 15 p.R/hr to 20 pR/hr, and the 1 meter readings ranged from 14 1.LR/hr to 20 pR/hr. The background at 1 meter typically ranges from 12 to 18 [.R/hr at the GA main site. See Figures 5 and 7 for locations and results.

3.

14 swipe samples for removable contamination measurements on paved surfaces. The maximum results were < 10 pCi/100 cm2 alpha and 14.39 pCi/100 cm2 beta activity. See Figure 3 for locations and Table 2 for results.

4.

15 fixed alpha readings on paved surfaces, all of which were less than the minimum detectable activity (MDA) for the instrument used. See Figure 3 for locations and results.

5.

14 fixed beta readings on paved surfaces. All measurements were less than the minimum detectable activity (MDA) for the instrument used. See Figure 3 for locations and results.

6.

Approximately 10% of paved surfaces were scanned for beta activity. The results ranged from 2200 to 3200 cpm using a 434 cm2 proportional detector. Typical background on asphalt for this detector is 2400 to 2900 cpm. See Figures 2 for locations and results.

Final Radiological Survey Report for Torrey Pines East Land Area

7.

10% of the entire area was scanned with a NaI(T1) detector held within 1" of the surface.

The exposure rate ranged from 15 hR/hr to 24 ptR/hr. See Figure 6 for locations and results.

8.

100% of the drainage area was scanned with a NaI(T1) detector held within 1" of the surface. The measurements ranged from 18 hR/hr to 20 [tR/hr. See Figure 8 for location and results.

Conclusion All of the Confirmatory Survey results indicated that activity levels on the Torrey Pines East Land Area are below the approved release criteria, which agrees with the Final Survey results.

B-10

+GENERAL ATOMICS

Table 1: Torrey Pines East Land Area Confirmatory Soil Sample Results U-238 (63Kev, 93 Key used when 63 not present)

DCi/l U-235 (144Kev,186 Kev used when 144 not present)

Radionuclide Concentrations (pCi/g)

Background Not Subtracted, 30 min, count Cs-137 (662 Kev)

Co-60

((1170 Kev+1330

.Kev) /2}

Total Thorium Th-228(238 Key), plus Th-232(91 I Key)

Other Isotopes

1

I_____

I t

I vCiI

p0 i/g pCilg pCi/g PCV-g Isotope 1

TPE-1 0.81 +/- 0.69 0.14 +/- 0.06 0.08 +/- 0.05 ND 2.75 +/- 0.81 ND 17 2

TPE-2 2.10 +/- 1.19 0.22 +/- 0.08 0.99 +/- 0.12 0.06 +/- 0.05 3.01 +/- 0.90 ND 20 3

TPE-3 2.55 +/- 1.25 0.10 +/- 0.09 ND ND 3.01 +/- 0.85 ND 18 4

TPE-4 1.73 +/- 0.64 0.14 +/- 0.09 0.36 +/- 0.08 ND 3.08 +/- 0.78 ND 17 5

TPE-5 1.59 +/- 1.01 0.23 +/- 0.08 0.06 +/- 0.05 ND 3.29 +/- 0.77 ND 17 6

TPE-6 1.19 +/- 0.98 0.11 +/- 0.08 ND ND 3.13 +/- 0.84 ND 18 7

TPE-7 2.04 +/- 0.91 0.11 +/- 0.08 0.28 +/- 0.07 ND 2.93 +/- 0.75 ND 17 8

TPE-8 2.15 +/- 0.76 0.21 +/- 0.08 ND ND 2.92 +/- 0.80 ND 17 9

TPE-9 0.93 +/- 0.75 0.19 +/- 0.10 ND ND 3.04 +/- 0.90 ND 19 10 TPE-10 1.70+/- 1.15 0.18 +/-_0.09 0.36+/-0.08 0.11 +/-0.07 1.89+/-0.65 ND 19 11 TPE-I 1 1.22 +/- 1.04 0.20 +/- 0.08 ND ND 3.44 +/- 0.88 ND 19 12 TPE-12 1.74 +/- 1.07 0.20 +/- 0.09 0.06 +/- 0.05 ND 3.32 +/- 0.77 ND 19 13 TPE-13 ND 0.19 +/- 0.09 ND ND 3.07 +/- 0.82 ND 18 14 TPE-14 1.27 +/- 0.86 0.14 +/- 0.04 0.05 +/- 0.02 ND 3.14 +/- 0.37 ND 17 15 TPE-15 2.04 +/- 1.06 0.13 +/- 0.08 ND ND 3.34 +/- 0.90 ND 17 16 TPE-16 1.03 +/- 0.87 0.13 +/- 0.08 ND ND 2.96 +/- 0.81 ND 18 17 TPE-17 1.71 +/- 1.00 0.12+/-0.06 ND ND 2.82+/-0.83 ND 18 18 TPE-18 1.73 +/- 1.02 0.17 +/- 0.09 ND ND 3.74 +/- 0.87 ND 16 B-11 Sample ID Exposure Rate in

.tR/hr at 1 meter from surface

- H.*. *.*:,**r*' **.

H

Table 1: Torrey Pines East Land Area Confirmatory Soil Sample Results U-238 (63Kev, 93 Key used when 63 not present)

U-235 (144Kev,186 Key used when 144 not present)

Radionuclide Concentrations (pCi/g)

Background Not Subtracted, 30 rain. count Cs-137 (662 Key)

Co-60

{(1170 Kev+1330 Key) /2)

Total Thorium Th-228(238 Key), plus Th-232(911 Kev)

I I

nCi/g nCik pCi/g pCi/g pCi/g Other Isotopes pCi/g Isotope Exposure Rate in ItR/hr at 1 meter from surface 19 TPE-19 1.16+/-0.98 0.12_+/-0.11 ND ND 3.34+/-0.83 ND 16 20 TPE-20 1.58 +/- 1.05 0.10 +/- 0.07 ND ND 2.18 +/- 0.68 ND 16 21 TPE-21 2.10 +/- 1.18 0.17 +/- 0.07 ND ND 2.97 +/- 0.76 ND 17 22 TPE-22 1.59 +/- 1.03 0.19 +/- 0.08 ND ND 3.27 +/- 0.82 ND 18 23 TPE-23 1.07 +/- 0.86 0.08 +/- 0.07 ND ND 2.69 +/- 0.24 ND 16 24 TPE-24 1.38 +/- 0.82 0.19 +/- 0.08 0.28 +/- 0.08 ND 2.70 +/- 0.78 ND 16 25 TPE-25 1.43 +/- 0.92 0.14 +/- 0.08 ND ND 3.38 +/- 0.86 ND 16 26 TPE-26 1.13 +/- 0.93 0.08 +/- 0.07 ND ND 2.88 +/- 0.83 ND 16 27 TPE-27 2.03 +/- 1.01 0.14 +/- 0.08 ND ND 2.94 +/- 0.74 ND 17 28 TPE-28 1.49 +/- 0.60 0.09 +/- 0.06 ND ND 2.48 +/- 0.67 ND 17 29 TPE-29 1.47 +/- 0.80 0.49 +/- 0.29 ND ND 3.37 +/- 0.77 ND 17 30 TPE-30 0.72 +/- 0.82 0.09 +/- 0.07 ND ND 2.32 +/- 0.72 ND 15 31 TPE-31 0.81 +/--0.87 0.11 +/-0.08 0.11 +/-_0.06 ND 1.84 +/-_0.74 ND 16 32 TPE-32 2.01 +/-0.74 0.19 +/-0.09 0.15 +/-0.07 ND 2.11 +/-_0.85 ND 14 33 TPE-33 1.36_+/-0.84 0.13_+/-0.08 0.19_+/-0.07 ND 2.10_+/-0.97 ND 15 34 TPE-34 1.24 +/- 0.73 0.11 +/- 0.06 0.92 +/- 0.09 ND 2.03 +/- 0.60 ND 20 35 TPE-35 0.76 +/- 0.72 0.13 +/- 0.07 0.88 +/- 0.06 1.02 +/- 0.11 2.13 +/- 0.64 ND 20 B-12 Sample ID m

m

Table 2: Torrey Pines Land Area Confirmatory Swipe Survey Results Swipe No.

Gross aL in dptn/1(X) cm2" Gross ~3in dpinhl0( cm, 1

<10

<10 2

<10

<10 3

<10 14.39 4

<10

<10 5

<10

<10 6

<10

<10 7

<10

<10 8

<10

<10 9

<10

<10 10

<10

<10 11

<10 10.83 12

<10

<10 13

<10

<10 14

<10

<10 B-13

Figure 1 : Torrey Pines East Land Area Torrey Pines East Land Area 1

3 4

5 6

7 8

9 i 10 11 12 13 14 15 16 17 18 N

M L

K J

H' F'

D C

B B-14 Torrey Pines East Boundary

Figure 2: Torrey Pines East Land Area, 10% Beta 434cm2 Scan of paved surface B

iC D

1 5

15 16 17f 18 6

7 8

9 10 11 12 13

/

F-I F

E F

G H

1 J

K!L M

N 4

4 storm iS,4A draig-pipe

-I--- ---- -

conprnd

/1 4.

gra vel:

A S*SAA

-4 4- - 4 ditch 0;

/

-i-00 I--

2800 t/ 3200 SAA i

i 4'

4 2800-lb-3200-SAA 4

4 4--------

11 Model Ludlum 2221 Ser#

84459 Probe 434cm2 Probe#

086215 Eff 23.62%

BKGD 2400 to 2900 CalDue 01/10102 Surveyed By: Will Schuck and Note: Results in cpm Barbara Lyons 11/05/01 B-15 1

ii 3

¢*

4 ii H *---

$4 S11 i 12 13 14 15 IU 17 10 meters InstrumentI V6ýý

Figure 3: Torrey Pines East Land Area, Fixed Alpha Activity, Fixed Beta Activity, And Removable Activity Samples B

C 16 15 17 18 D

1 S2 3

4 5

6 7

8 9

10 11 12 13 14 B

E AA 10-m e

-te it meters

F F--7 6 F w...

S

= Denotes smear locations

'-BI= Denotes 100cm2 2 minute count All readings<MDA

/A= Denotes direct 50 cm2 Alpha count All readings <MDA 1G H

I J

K L

M N

4~

drarmi npp 14 A

drainnaipe.

d I Irýp 1ond

-d F'ai n "

Nf BB 1738-.

storm 12 SA 5

.drain.pipe, concrete i

rcks 7

- -- gravel:t scale SA 10 A'

1 gravel SAA t

10

'-iii

/SAA A

B B

B 12 asphaltJ AA SOAi 13 ASAA14

-4 4

BA14 16 17 instrument Model Ludlum 2221 Model 12 Ser #

148436 138801 Probe 100cM2 50cm 2 Probe #

120477 145696 Elf 35.79%

22.52%

MDA 358 dpm 209 dpm Cal Due 04/29/02 11116/01 Barbara Lyons and WillISchuck 10/31/01 B-16

Figure 4: Torrey Pines East Land Area, Soil Sample Locations 2

4 5

6 7

8 9

10 11 12 13 14 E

F 9,-

/i 10 meters G

N:

G H

J K

L "storm M

N!

v4 1

H I

i K

L M

N Sn

= Denotes Soil Sample Location B-17 B

C-D 1

15 C

16 17 18 B

a a a

a adrainji ptp J

a-ad

'-II aiga

/

a a-

-4 7 -a ditch a..

.SA.

a drairapipe a

, SAA

~-

di-a

_1_!

A 12gravel1 a

a 1518 1496 131 12 25 24AA 2313 i

214 27 a

a a

15 32 aa W31 a

a0 a

17 4-+----

Figure 5: Torrey Pines East Land Area, Exposure Rate Measurements at Soil Sample Locations D

2 3

B -- C 10 11 12 13 14 E

m 0 F

10 meters G

4--I G

H I

J K

L M

N a""7*

,,/

H I

J K

L M

'- "t-..

-11

storm, drain pi*..ini

-pp pond~

20/20 dr2i00 0 19/1 1

19/18 loarm W

2 drainpipe ditch 9/~

9/117 18/17 1 /1 gravel!

. 19/1

!~18/17 r..

SAA I

asphaltale 17/17,

/17

!8/1 1 8/18

-z"-

z-

-4

-I

gra v

18/18 asphalt I

r 16/16 7/16 16/16

1716, 17/1 T 11 6L1

,"6

/1 a-

£ a

a a

a aa Sa 4

A 5

18/17 6

S....

9 10 S11 17/17 SAA 12 I

13 14 15 16 17 N

Instrument Model Ludlum 3 Ser #

151348 Probe 2x2 Probe#154618 Eff N/A Cal Due 01/14102 nn/nn: Denotes Contact/!1 meter above surface readings Surveyed by: Will Schuck 10/31/01 B-18 4

5 6

7 8

9 15 17 18 B

C 1

2 3

-4 I

7

Figure 6: Torrey Pines East Land Area, Exposure Rate 10 % Scan 10 mete D

ters Instrument Model Ludlum 3 Ser #

153551 Probe 2x2 Probe #

155109 Eff N/A Cal Due 01/08/02 Survey By: Will Sohuck and Barbara Lyons 11/05/01 Results in ptR/hr B-19 E

1 B

K----

C 4

5 6

7 8

9 2

3 15 F!

Gi H

~

K Li M

NI

-- a-a a

a a

a aY a au ia ponda a4 a

4-----

str dri pipe"na~

a I

gr,q S44 a aveaIAA a

a a

a a a

A/12

/

SA a

AA 13 18 tW 22 SAA al 14 15 17

-a a -

-a

-a

-a a

-a-

-a

-a a-- -a-

-a 16 a 17 a

18 10 11 12 13 14

/

I I

I

Figure 7: Torrey Pines East Land Area, Fixed Exposure Rate Measurements D

1 2

3 4

5 6

7 8

9 10 111 12 13 14 18 E

19 19 18 I -

19 19 19 19-G 9 3 C4 i

2Z0 20 20 20 H

H J

'21 21 storm rain pipe icrete-itch 21 Igravvel

/ 2 0 jj, 4 1 6 161

- --i,- *-

+'- --

A2 0 16 i 4 m7 S-L-/7, a

a a

K

L 1

17 17 i16 S18 17 1'"-

16!

i SAA ti" L16 16,i 17 16 t 18 i 18i 1 17 i 6 1 1SAA ii i

S17 i17 4-t6- -

16-7' i

I it S4A 17 17

16 16 S...

-i!

17 PlI*AA

6 16 16 1-! $ AA i

, 16 17 16 16 L - -

I -

Model..Ludium 3 Se #15 3 551 Probe # ::;;,S

{:;,:,155109

?!,**+-:

Cal.Due : tt+i01/08/02 storm drain pipe

/

20 21 2

21 19 16 C

Z I pond S20 17 IAA:

,10 16 5

10 12 i13 14 I a 115 15 16 16 17 18 10 meters Survey By: Will Schuck and Barbara Lyons 11/02/01 Results in ýtR/hr at 1 meter from the surface B -20 I

I

Figure 8: Torrey Pines East Land Area, Exposure Rate Scan of Drainage Area D

1 2

3 4

5 9

10 11 12 13 14 E

F i I--

-I 10meer G

I H

J K

M storm i drain pipp r

/'o

-/ -'* - -

drain pipe ditch gravel SA S AA I

S I

I I

i

/

Ii i

+'

-T -

4-1---

I I

Iscale 7

- - -I T_

s_

SA

/

I C

SAA 10 11 JA I13 SAA J 14 15 17

-4 Instrument Model LudIum 3 LudIum 3 Ser #151348 153551 Probe 2x2 2x2 Probe #154618 155109 Eff N/A N/A Call Due 01/14/02 01/08/02

= Denotes area 100 % scanned Results: All readings 18 to 20 p.R/hr Surveyed by: Will Schuck and Barbara Lyons 10/17/01 B-21 B

15

/

1 linage

-I-S4 on

'i~

16 17 18 4

i/

I1p 74

-A -i 10 meters I

ML013390423

Text

Subject:

Subject:

Dear Ms. Adams and Ms. Kwok:

Enclosure:

Background

Background

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