ML20056F306

Soil Sampling Plan for Phase II of Sva Decommissioning Project

ML20056F306
Person / Time
Site:	07000734
Issue date:	08/20/1993
From:	GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER
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ML20056F303	List: ML20056F302 ML20056F306
References
PROC-930820, NUDOCS 9308260345
Download: ML20056F306 (18)

Text

7.

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& ATORNCS SOIL SAMPLING PLAN FOR PHASE ll OF THE SVA DECOMMISSIONING PROJECT l

i AUGUST 20,1993 1

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SOIL SAMPLING PLAN FOR PHASE II OF THE SVA DECOMMISSIONING PROJECT j

PAGE 1 OF 17 August 20,1993 1.

Obiective To provide a plan for soil sampling during Phase 11 of the SVA Decommissioning l

Project under which GA will demonstrate compliance with approved soil release cnteria.

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11. Release Crtteria

1. Soil Concentrations The soil release criteria to be used are provided in Table 1 which are taken from the Nuclear Regulatory Commission's Policy issue SECY 81-576, October 5,1981 and previously approved for the GA site and the SVA Decommissioning Project (References 1,2 and 3).

The values in Table 1 are levels above naturally occurring background (section 2.3.1 and 6.3 of Reference 4).

l The soil release criteria is 10 pCi/ gram for natural thorium (Th-232 and Th-228).

Therefore, the limit for Th-232 is 5 pCi/g and the limit for Th-228 is 5 pCi/g i

(above natural background concentrations).

The limit for enriched uranium (30 pCl/ gram above natural background concentrations) will be applied by adding the U-234 and the U-235 concentrations. The U-234 concentration will be determined by measuring the l

U-235 concentration by gamma spectroscopy and then using a ratio of 30:1 (U-234:U-235) based on typical uranium isotopic analysis of enriched uranium used in the facility as shown below:

f NUCLIDE AVERAGE SPECIFIC ACTIVITY WEIGHTED f

WEIGHT %

(p curies /g)

ACTIVITY I

(p curies /g)

U-234 0.98 6129.54 60.069 l

U-235 93.15 2.14 1.99 L

l U-236 0.40-63.56 0.254 U-238

.5.50 0.34 0.0187 TOTALS 100.03 62.33 mr Based on the above, the weighted activity ratio of U-234:U-235 is 30:1.

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SOIL SAMPLING PLAN FOR PHASE 11 OF THE SVA DECOMMISSIONING PROJECT PAGE 2 OF 17 August 20,1993 l

in order to confirm the ratio, contaminated soil from a sump located in the North Annex was sent to IT Corporation on April 22,1992 for uranium isotopic analysis. The average ratio of U-234:U-235 from the analysis was found to be about 26:1. The results of the analysis are provided in Attachment 1.

Therefore, the use of the 30:1 ratio is conservative.

It is GA's intent to remediate areas containing elevated activity levels in the soil.

However, in the event that reasonable efforts have been made and soil concentrations continue to remain elevated, GA may apply the criteria described in section 2.2 and section 8.0 of Reference 4 to determine compliance.

Reference 4 (section 2.2 and section 8.0) established the guideline that areas of residual activity exceeding the guideline value, known as " elevated' areas, are acceptable, provided they do not exceed the guideline value by greater than a factor of (100/A)*, where A is the area of residual activity in m*, and provided l

the activity level at any location does not exceed three times the guideline values.

2. Direct Measurements Exposure rates are not to exceed 10 microR/hr above background at 1 m above the surface.

j For open land areas, exposure rates (measured at 1 m above the surface) can be averaged over 100 m* grid areas. The maximum exposure rates over any discrete area may not exceed two times the limit above background in accordance with section 2.2 and section 8.0 of Reference 4. It is GA's intent to remediate all areas where microR readings exceed 10 microR/hr at 1 m above the surface. However,in the event that reasonable efforts have been made and measurements continue to remain elevated, GA may apply the criteria described above and discussed in section 2.2 and section 8.0 of Reference 4 to determine compliance.

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111. Buildina 37N and Surroundina Area to be Released to Unrestricted Use l

Figure 1 shows Building 37 (north end) and the immediate adjacent surrounding j

area (" extended footprint') which is to be released to unrestricted use.

l-IV. Samole Anahrsis l

1. flackground Concentrations Natural background concentrations in soil near the SVA (Building 37) site have been established (at the 95% confidence level) and are provided in Table 2.

The locations from which samples were taken are provided in Attachment 2.

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&+ CENERAL ATOHC5 SOIL SAMPLING PLAN FOR PHASE II OF THE CVA DECOMMISSIONING PROJECT

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2. Uranium and thorium concentrations in soil Uranium and thorium concentrations in soil samples will be determined by using gamma spectroscopy. The U-235 concentrations will be determined using the 144 kev peak or the 186 kev peak. Th-232 concentrations will be determined by averaging the Th-228 concentration (average of the 238 kev Pb-212 peak and the 583 kev TI-208 peak) and the Ra-228 concentration (average of the l

338 and 911 Ac-228 peaks).

Samples will be counted for a minimum of 15 minutes. A 15 minute count is sufficient to detect the uranium-235 gamma ray (144 or 186 kev peak) and gamma rays from the various Thorium daughters at levels below the release criteria. The results will be compared to the release limits.

Typical lower limits of detection for a 15 minute count are as follows:

U-235 is < 0.3 pCi/g i

Th-228 is < 1.5 pCi/g Ra-228 is < 1.5 pCi/g V. Sample Collection Soil samples will be collected from within the extended footprint area (see Figure 1), including from underneath the concrete slab, from underneath and around the drain lines and from exposed soil in the area extending from the concrete slab to the boundary of the extended footprint. Grids will be established for the purpose of referencing the locations of samples and measurements. The 10 m x 10 m grid system to be used is shown in Figure 2.

1. General A 15 cm " surface" soil sample will be collected with a sample size of approximately 1 kilogram. The sampling locations will be identified on drawings. The samples will be properly logged, labeled, packaged and tracked.

All debris (grass, rocks, sticks, and foreign objects) will be removed from the i

sample. Samples will be dried and counted by gamma spectroscopy. Results will be reported in pCi/g for each radionuclide.

2. Underneath the concrete slab Biased samples will be collected from underneath the concrete slab (under cracks and/or drains where the soil appears affected; i.e., discolored, odiferous or otherwise abnormal or suspected of contamination).

i Scanning (along the surface of the soil) will be performed to identify locations of elevated activity levels. For "affected areas",100% coverage will be achieved i

l GENERAL ATOANCS I

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SOIL SAMPUNG PLAN FOR PHASE 11 OF THE SVA DECOMMISSIONING PROJECT l

PAGE 4 OF 17 August 20,1993 and for " unaffected areas", spacing intervals between scanning paths will be l

l such inat a minimum of 50% of the surface is scanned. GA is currently l

investigating the use of various Nal (TI) detectors for scanning purposes in order to determine which size detector is best suited for scanning U-235 in soil i

with concentrations at 75% or less of the release criteria, as recommended in I

section 4.2.3 of Reference 4.

Areas of suspected activity, identified by scanning or visual inspection, will be evaluated to determine their activity levels and the extent of contamination.

J Cleanup will be performed, as required, and the scanning repeated until j

remediation is accomplished as demonstrated by additional soil sampling, analysis and comparisons with the guidelines.

An "affected" area is an area having potential for radioactive contamination or having known radioactive contamination. As applied to the SVA Decommissioning Project, the soil underneath the concrete slab (with the exception of two known areas of soil contamination) will be classified as

" unaffected'.

There are currently two known "affected" areas in the facility (shown in Figure 3). Figure 3 also shows locations where soil samples underneath the concrete slab have been collected and analyzed; the results show concentration levels below the release criteria in all but the two "affected" areas.

After scanning and remediation of known affected areas, systematic soil sampling will be performed on a 100 m* (10 m x 10 m) grid system at locations equidistant between the center and each of the four grid block corners (see Figure 4).

If scanning is not capable of detecting surface areas with activity levels s 75%

of the release limits, additional sampling will be instituted to provide an acceptable level of confidence that locations of elevated activity have been identified. In this case, sampling in each affected area will be done on a triangular grid with a sampling interval of 5 m on a side (enclosed area of approximately 10.8 m ) for a 95% assurance that elevated areas in excess of 10 m* surface area are identified. By beginning with the standard systematic pattern and including additional sampling points located along the 10 m grid lines, at block corners and centers, and midway between grid block corners, a triangular sampling pattern with spacing of 5 m or less (enclosed area of approximately 6.3 m*) is obtained (see Figure 5).

l GENEntAL ATDNFCS P

SOIL SAMPLING PLAN FOR PHASE 11 OF THE SVA DECOMMISSIONING PROJECT PAGE 5 OF 17 August 20,1993 While section 4.3.4 of Reference 4 recommends soil sampling be performed at a minimum of 30 randomly selected locations in unaffected areas, GA will 2

conduct systematic soil sampling on a 100 m (10 m x 10 m) grid system at locations equidistant between the center and each of the four grid block corners (see Figure 4). If soil is identified to be above 25% of the release criteria j

(above background), the area will be investigated to determine whether any

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reclassification and/or increased soil sampling is appropriate.

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3. Lindemeath the drain imes

<vnen collecting samples from undemeath the drain lines (in the trenches created during removal of the drain line), biased samples will be collected as follows:

1) Soil samples will be collected from underneath and around any drain lines which appear broken, corroded or otherwise deteriorated.

2) Soil samples will be collected whenever exposure rates are elevated (measured using microR meters and/or Nal (TI) detectors /ratemeters).

3) Soil samples will be collected if the soil appears affected, i.e., discolored, odiferous or otherwise abnormal.

In addition, systematic samples will be collected approximately every 5 m (about every 15 feet) from underneath the drain lines. The drain lines are located about one (1) to three (3) feet below the concrete surface underneath the production floor. The production floor area is about 120 feet (east and west) x 160 feet (north and south). There are a total of 12 lines running west to east, therefore a total of about 100 samples will be collected. In addition, there are about 350 feet of arterial feeders running between the 12 lines; samples will be collected every 5 m (below arterial feeder lines), if possible. - Thus, approximately 20 samples will be collected under these arterial lines. Soil will not be back-filled into trenches unless approved by the Nuclear Regulatory Commission (which will be deemed to signify approval by the State of Califomia).

4. Subsurface Samoles Remediation'of soil will continue to a depth required to reduce the concentrations to levels below the release criteria. A final sample (s) after remediation will demonstrate that residual activity is below the release criteria.

Subsurface samples underneath the concrete slab may be collected to a depth

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M t AmOMCS SOIL SAMPLING PLAN FOR PHASE 11 OF THE SVA DECOMMISSIONING PROJECT PAGE 6 OF 17 August 20,1993 1

of three (3) feet. Subsurface samples will be collected in biased locations and will include: 1) each location (larger than 5 m 8 ) where soil contamination above the guidelines was discovered and remediated and 2) any location where exposure rate measurements were elevated (greater than two times the external radiation exposure limit, above background). These measurements will be made using a microR meter or Nal (TI) detector /ratemeter.

Subsurface samples will also be collected underneath drain lines in a total of eight (8) locations to a depth of about fifteen (15) feet. If necessary, based on i

the results of the analyses of these samples at these depths, additional sampling at further depths and/or at other locations will be conducted.

In addition, at least six (6) subsurface samples (to a depth of 15 feet) will be collected in the north end of the building (North Annex area). There are no underground drain lines in this area, but historical data indicates that the area was used as an outside storage area prior to the addition of the annex.

Subsurface samples may also be collected in other suspect locations, if warranted by exposure rate measurements or remediation efforts.

5. Outside Areas of the Buildina Scanning (along the surface of the soil) will be performed in all exposed soil locations to identify locations of elevated activity levels. Spacing intervals i

i between scanning paths should be such that a minimum of 50% of the surface is scanned.

Systematic soil sampling from all exposed soil locations will be performed on a j

l 100 m* (10 m x 10 m) grid system at locations equidistant between the center l

and each of the four grid block corners (see Figure 4).

l At least two (2) subsurface samples will be collected to a depth of about fifteen l

(15) feet. If necessary, based on the results of the samples at these depths, l

additional sampling at further depths and/or at other locations will be conducted.

VI Direct Radiation Measurements i

To determine compliance with the external radiation limit of 10 microR/hr at 1 m above the surface, exposure rate measurements will be taken at 1 meter at all systematic soil sampling locations (after soil remediation has been completed).

The results will be compared with the release criteria shown in Table 1 (and discussed above).

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A calibrated microR meter will be used to determine exposure rate measurements in microR/hr. A pressurized ion chamber (PIC) will be obtained in order to verify the calibration of the microR meters.

Vil Phase 11 Final Survey Report All survey results will be documented and provided to the Nuclear Regulatory Commission and the State of Califomia in a final report. Mate For areas where remediation was conducted, the report will include the results of surveys conducted prior to the area being remediated as well as the final survey results.

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SOIL SAMPUNG PLAN FOR PHASE 11 OF THE SVA DECOMMISSIONING PROJECT PAGE 8 OF 17 August 20,1993 l

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REFERENCES 1

i I.. Nuclear Regulatory Commission, Policy issue SECY 81-576, October 5,1981.

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2. Asmussen, Keith E., Letter No. 696-1896 to John W. N. Hickey, ' Decontamination Guidelines for GA's SVA Decommissioning Project", dated April 14,1992.

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3. Hickey, John W. N., Letter to General Atomics, ATTN: Dr. Keith E. Asmussen, License No. SNM-696 Amendment No.18, dated March 31,1992.

4. Manual for Conducting Radiological Surveys in Support of License Termination (Draft for Comment), NUREG/CR 5849, ORAU-92/C57, Oak Ridge Associated Universities, June 1992.

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I SOIL SAMPLING PLAN FOR PHASE II OF THE SVA DECOMMISSIONING PROJECT PAGE 9 OF 17 August 20,1993 Table 1.

Radionuclide Concentration Limits For Soll And Exposure Rate Limits-From Option 1 NRC Policy issue (SECY 81-576)

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t Radionuclide Concentration (pCVg)*

228 Natural Thorium,,232Th &

Th) with daughters present and in equilibrium 10 i

Enriched Uranium (Soluble and 30 l

Insoluble)"

I External Dose Limit = 10 pR/hr (above background levels) at 1 m above surface If more than one radionuclide exists, the sum of the fractions of the concentrations will be calculated a follows:

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b=1 l

C, = The average soil concentration of radionuclide i.

( = The maximum soil limit for i (pCi/g).

The sum of the fractions must be less than one in order for the soil to meet the release criteria.

• • The

• SU concentrations determined by gamma spectroscopy will be used to ensure that concentrations for enriched Uranium are below the given limit. The ratio of **U to

• 50 is thirty to one (30:1) for the SVA facility.

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SOIL SAMPLING PLAN FOR PHASE 11 OF THE SVA DECOMMISSIONING PROJECT PAGE 10 OF 17 August 20,1993 Table 2.

Background Radionslide Concentmtions (pCVg) in Soil '

Sample Co-60 Cs-137 Th-228 Ra-226 Ra 228 U-238 U-235 8

ID AJ ND" ND 1.28

• 0.07 1.02

• 0.10 1.47

• 0.14 1.98 i 0.31 0.15

• 0.03 G2 ND 0.12 * ' G 0.92

• 0.07 0.86

• 0.59 1.01

• 0.12 1.86

• 0.29 0.12

• 0.02 AC ND ND 1.29

• 0.07 1.14

• 0.12 1.34

• 0.14 2.27

• 0.27 0.20

• 0.03 BKG-1 ND ND 1.40 i 0.16 0.92

• 0.23 1.44 0.28 2.06

• 0.48 0.19

• 0.06 BKG-2 ND ND 1.54

• 0.15 1.07

• 0.11 1.57

• 0.27 2.30

• 0.45 0.17

• 0.05 BKG-3 ND ND 1.40

• 0.14 0.82

• 0.17 1.62

• 0.26' ND 0.19 0.05 BKG-4 ND ND 0.67

• 0.09 0.72

• 0.14 0.84

• 0.17 1.15

• 0.37 0.09 0.04 BKG-5 ND ND 1.51

• 0.16 1.04

• 0.22 1.79 0.31 2.77

• 0.67 0.12

• 0.06 BKG-6 ND ND 0.68

• 0.09 0.72

• 0.13 0.76

• 0.16 ND 0.08

• 0.03 BKG-7 ND ND

• 17

• 0.12 0.79 i 0.17 1.28 0.22 1.83 0.43 0.11

• 0.04 Mean

• 2 o 19

• 0.64 0.91

• 0.30 1.31

• 0.68 2.03 0.93 0.14

• 0.09 i

Samples gamma scanned for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.

ND =

< 0.1 pCi/g for Cs-137, < 0.1 pCilg for Co-60, < 1.0 pCl/g for U-238 m

Samples wered in June and August 1993, typically about 1-2 miles from the Building 37 site. See Attachment 2 for locations.

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l SOIL SAMPUNG PLAN FOR PHASE II OF THE SVA DECOMMISSIONING PROJECT PAGE 11 OF 17 August 20,1993 i

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FIGURE 1.

BUILDING 37N AND SURROUNDING AREA TO BE RELEASED TO UNRESTRICTED USE l

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FIGURE 2 GRIO IDENTIFICATION SYSTEM (10 m x 10 m grids) f 10 l

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i RGURE 3.

LOCATIONS OF SOIL SAMPLES COLLECTED UNDER 37N SLAB i

BUILDING 37N (SVA)

E D C 8 Combineo Soil Sompie Locations From The Chorocterization Survey and Subseouent Sompiing i

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3 m grims 3m x Shows core somp!e locotions where soil somples were token up to 18" below the surface (6/91) 8 e Shows core sompte locotions where soi' somptes were token up to 6" below the surf ace (9/88)

? Shows core somple locotions where soil sompie anotysis showed the soil to be contaminateo (8/91) 13 Shows trenen weere the sump for the HCL furnace was. Soil somptec 6/91.

2 g Shows trench where the sump for the Cooter was. Soil sompted 6/91 & 7/91 wnen the sump was j

removed. A 6*x6' slob of c* ment was removed to sompie oreo surrouncing tM sump Sampics were i

token 12/5/92. soil was removed. more semples were token 12/16/92. more soil was removec. onrt the trench was resomoted on 1/6/92.

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PAGE 14 OF 17 August 20,1993 i

FIGURE 4.

STANDARD SAMPLING PATTERN FOR SYSTEMATIC GRID SURVEY OF SOIL

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i LOCATIONS OF O SYSTEMATIC SOtL SAMPUNG

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SOIL SAMPLING PLAN FOR PHASE 11 OF THE SVA DECOMMISSIONING PROJECT PAGE 15 OF 17 August 20,1993 FIGURE 5. SAMPLING PATTERN TO IDENTIFY Soll AREAS OF ELEVATED ACTIVITY iou a'

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Y AFOANCE SOIL SAMPLING PLAN FOR PHASE II OF THE SVA DECOMMISSIONING PROJECT PAGE 16 OF 17 August 20,1993.

ATTACHMENT 1: RESULTS OF SVA SOIL SAMPLE ANALYSIS BY IT CORPORATION 16-Jun-92 10:32 AM

. IT ANA' YTICAL SERVICES 2000 GEORGE WsHINGTON WAY. RICHLAND. WA RADIDCHCHICAL As4A.YSIS REPORT -

CA Accounttsa Listed Results reported on 920616 CDUNTING DVIRALL ANALYSIS PERCENT SAMPLE SAMPLE TYPE CUSTs ISOTDPE-RESULT ERRDR ETROR SIZE MOIST DATE TIME

• • Reported => 920616 S0IL UXO643 U-234 183 2.20E+03 PCI/O 1.26E+01 2.012+02(28) 1.00E-t'l C 920422 l

U-234 RESULT INCLUDES U-233. U."'.35 RESULT INCLUDES U-236 SDIL U10643 U-235 184 8.2SE+01 PCI/O 2.44E+00 7.93E+00128) 1 00E-01 C 920422 U-234 RESULT INCLUDES U-233. U-235 RESULT INCLUDES U-236 S01L UX0643 U-238DA 185 8.97E+00 PCI/O 8.14E-01.1.17E+00(28) 1.00E-Os 0 920422 U-234 RESULT INCLUDES U-233. U-235 RESULT INCLUDES U-236' SDIL Ux0643 U-234 183 2.89E+03 PCI/G-1.48E+01 2.662+02(25) 1.00E-01 0 920422 DUPLICATE SAMPLE ANALYSIS. U-234 INCLUDES U-233/U-235 INCLUDES U-236 SDIL UX0643 U-235 184 1.14E+02 PCI/C 2.94E+00 1.09E+01(253'1.00E-01 0 920422 DUPLICATE SAMPLE ANALYSIS. U-234 INCLUDES U-233/U-235 INCLUDES U-236 SDIL UXO643 U-238DA 185

1. 21E+01 PCI/O -- 9. 62E-01 1. 48E+00(28) 1.00E-01 0 9204:2 DUPLICATE SAMPLE ANALYSIS. U-234 INCLUDES U-233/U-235 INCLUDES U-236 6 Records listed (A x O (o 4 5 u-LM u-155 D *o = h.l Izoo r C y

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$ AFOANCS SOIL SAMPLING PLAN FOR PHASE 11 OF THE SVA DECOMMISSIONING PROJECT PAGE 17 OF 17 August 20,1993 l

ATTACHMENT 2: LOCATIONS OF BACKGROUND SOIL SAMPLES SAMPLE ID LOCATION AJ Collected on a hillside west of Building 39 and northwest of building 37, three feet from GA's fence.

G2 Collected about 1200 feet and about 7/8 of a mile southwest of Building 37.

AC Collected about one mile southeast of the main site and about two miles southeast of Building 37.

I BKG-1 Collected about 1 mile from Building 37 at the Scripps Hospital Entrance, east of Genesse Avenue.

BKG-2 Collected about 1.2 miles from Building 37 at Sorrento Court Rd. by the Post Office entrance (North Side).

BKG-3 Collected about 1.5 miles from Building 37 at Sorrento Vista Parkway near Lusk Blvd. South.

BKG-4 Collected about 1 mile west from Building 37, west off Genesee corner of North Torrey Pines Road and Torrey Pines Scenic Drive BKG-5 Collected about 2 miles west of GA off of La Jolla Shores Drive.

BKG-6 Col'r. ed about 2 miles northwest of Building 37 on North Torrey Pines Road BKG-7 2 miles near V.A. Hospital on La Jolla Village Drive South West l

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