ML19343A314
| ML19343A314 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 09/05/1980 |
| From: | CAROLINA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19343A310 | List: |
| References | |
| NUDOCS 8009170191 | |
| Download: ML19343A314 (38) | |
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RECOVERY OF RADIOACTIVE MATERIAL FROM THE BRUNSWICK COUNTY l
LANDFILL NEAR SOUTilPORT, NORTH CAROLINA 1
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a FINAL REPORT September 5, 1980 e
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e k-DISCOVERY OF THE CONTA!!INATION On April 28,.1980, a CP&L Health Physics foreman accompanied an NRC inspector to the Brunswick County Southport Landfill.(Figure 1) to inspect the landfill utilized by the Brunswick Steam Electric Plant for disposal of noncontaminated
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solid waste. A random survey was performed by the NRC inspector and the Health Physics foreman using an Eberline model " Rascal" with a 2" x 2" gamma scintil-lation crystal and an Eberline micro-R-meter. Two locations were identified as having radiation levels in excess of background -(see Figure 2).
Construction personnel were dispatched from the CP&L Brunswick Steam Electric Plant to excavate the locations ~and remove any contaminated material. At location "J-5", two plastic "Powdex" resin buckets were found to contribute the major
. quantity of. radiation. Each presented average radiation levels at contact of 30 to 40 mR/hr as measured by a Teletector. One bucket had a single spot radiating 100 mR/hr at contact. The buckets were recovered from a depth of 2 to 2-1/2 feet.
At location "E",'an elevated radiation intensity of 12-pR/hr was discovered by the Brunswick Steam' Electric Plant General Manager as he inspected the area.
Four crushed drums with radiation intensities of 1 mR/hr were recovered frem this location at a depth of N1. foot. The contaminated material was placed in dumpster-type, metal containers and returned to the Brunswick Plant for disposal as radio-i active waste. Two containers of 98 cubic feet each were removed.
These discoveries initiated an extensive series of investigative, monitoring and~
recovery activities directed towards insuring that the public health had not and would not be adversely affected by the deposition of radioactive material in the landfill.
Table 1 lists these actions in sequence.
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TABLE 1
SUMMARY
OF EVENTS AND ACTIVITIES April 28 Discovery.of Material and Removal of two Buckets April 29 Radiation Survey of Landfill April 30 Radiation Survey of Landfill May 1 Sampling and Evaluation of Environs surrounding Landfill May 2 Initiated Recovery Operations May 3-6 Continued Recovbry of Material May 7 Conducted Resurvey of Landfill May 8
' Conducted Survey of Cedar Grove Landfill Completed Resurvey & Resumed Material Recovery May 9 Continued Recovery of Material J
May 10 Continued Recovery of Material tiay 11 Continued Recovery of Material May 12 Performed a 3rd Survey of Current Trench Area May 13 Recovered Material May 14 Completed Material Recoveries May 28 Survey of Ocean Isle; Leland Landfills July 11 Wello Drilled for Sampling Ground Waters July 16 Ground Waters Sampled 9
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SURVEYS OF Ti!E LANDFILL On April 29, 1980, a comprehensive survey of the landfill area was initiated.
The curvey was conducted by representatives of the North Carolina Department of Iluman Resources, Radiological Protection Section, and IIcalth Physics personnel from CP&L. Additional surveyc were performed on May 7, 8, and 12,1980.
The principal survey instrument used was a Reuter-Stokes RS-lll pressurized ionization chamber. The detector chamber was passed over the covered landfill area approxi-mately 6 to 12 inches above the ground. One technician cbserved the instrument digital display while another held and moved the detector. To ensure an orderly coverage of the area and to expedite the survey, a jeep-type vehicle was used to transport the surveyors. The detcetor chamber was held from the edge of the tailgate by a technician. The vehicle was driven at a rate from one to three miles per hour. Tire tracks over the sand indicated the previous track. The subsequent pass was made such that the path width area was no greater than five feet wide.
The background radiation intensities varied from 5 to 7 uR/hr as ceasured with the Reuter-Stokes RS-lli pressurized ionization chamber. When the radia61on intensity increased to 8 to 9 pR/hr, the vehicle was stopped and a detailed survey was made with both the pressurized ion chamber and the micro-R-meter.
Any location presenting a radiation intensity of 9 pR/hr or greater was marked for further investigation using a stake and ribbon identifier.
See Figure 2 for location of these marked areas.
As of August 20, 1980, soil piled in the areas indicated in Figure 2 still prevented adequate surveys of those locations.
As soon as this sand can be removed without affecting landfill operations, these areas will be surveyed.
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RECOVERY OPERATIONS The removal of the_ contamination was performed according to the procedures attached as Appendix A.
These procedures were reviewed thoroughly by Health
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Physics personnel to assure personnel safety during the recovery operations. The objective of the excavations was to remove any items that exhibited radiation
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levels greater than twice the background level. The result was to reduce the
. radiation levels to less than 10 pR/hr as determined by-the pressurized ionization
- chamber. Measurements at each hole were made by the Radiation Protection Section of the North Carolina Department of Human Resources.
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The excavation yielded a variety of specific material with readily detectable radiation intensities. These included gloves, other anti-contamination clothing, pipe fittings, building materials, air filters, tape, and paper goods.
In most holes, low level general contamination was found which elevated the average 6
radiation intensity to several uR/hr above background.
In a few cases, the contaminated materials were in_the form of flaor sweepings and ion exchange resin.
In some holes, the dirt had become contaminated, in which case it was removed. Table 2, summarizes the findings on each exesvation.
All of the items were removed and placed in dumpster-type containers for aisposal as radioactive ma5erial.
Forty-five dumpscers were filled with this material consisting of 4410 ft The estimated'acEivity rehoved from the landfill was 3.8 millicuries, as shown-in Appendix B.
The North Carolina Department of Human Resources, Division of
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Radiation Protection places the estimate at 7.2 mci. The major radionuclides l
. present in the contamination were 60Co, 54Mn, 137Cs, and cr.
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During excavation, air. samples were periodically taken downwind of the landfill-site. Table'3 summarizes the results of these analyses.
No significant airborne radioactivity was observed in the course of the sampling.
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Once a hole was declared acceptabic, soil samples were taken from the bottom of the hole and aliquots were provided to the NRC and the North Carolina Radiation Protection Section. Analyses of these samples are presented.in Table 4.
Upon final closing of each hole or limited area of holes, the locations were marked for future reference and a final survey was performed.
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TABLE 2 ITEMS RECOVERED FROM EACl! LOCATION
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POSITION 'A' OPENED: 5-6-80/1130 25 pR/hr
- CLOSED: 5-6-80/1325 8.5 pR/hr MATERLiL RECOVERED:
. Bag of cotton gloves (0.7 mR/hr)
Kimwipes
__ Coveralls SOIL SAMPLE:
BLSS-20 L... _ ;. :. -...
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..;- OPENED: 5-5-80/1040 23_pR/hr...
CLOSED: 5;$-80/1520 7 pR/hr~
~; T MATERIAL RECOVERED:
,.3fe 1" pipe,' 3" long with pipe caps, and 2" rubber washers = 1-4 mR/hr
..:..:. a t contact.
-"7 SOIL SAMPLE:
BLSS -
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._ OPENED: 5-6-80/0930 12.5 pR/hr l
CLOSED: 5-6-80/1110 8.0 pR/hr l
l MATERIAL RECOVERED:
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7 Bag of gloves, wipes, blotter paper, paper coveralls SOIL SAMPLE:
BLSS-19 POSITION ' D' OPENED: 5-3-80/1408 17 pR/hr CLOSED: 5-3-80/1450 7.1 pR/hr MATERIAL RECO' ERED:
V Gloves (15 pR/hr)
Concrete (8 pR/hr)
SOIL SAMPLE:
BLSS-8 9
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TABLE 2 (Cont'd)
POSITION
'E' OPENED: 5-3-80/1517 11 pR/hr CLOSED: 5-5-80/0950 8.7 pR/hr MATERIAL RECOVERED:
Drums (1 mR/hr; 5 mR/hr)
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Rag (100 pR/hri Coverall (2.5 mR/hr)
Mop Head (15 WR/hr)
Glove (1.8 mR/hr)
NOTE: Position 'E' was opened twice (5-3-80 and 5-8-80)
SOIL SAMPLES:
BLSS-9, BLSS-15 POSITION ' F' OPENED: 5-2-80/1725 11 pR/hr CLOSED:
5-3-80/0955 6 pR/hr MATERLiL RECOVERED:
Shoe Covers (5 pR/hr)
Other Anti-C Tape Work Gloves (15 pR/hr)
Mop Heads (18 pR/tr, 700 pR/hr)
Kimwipes (100 pR/hr)
SOIL SAMPLE: BLSS-6 POSITION ' G' OPENED: 5-2-80/1600 21 pR/hr CLOSED: 5-2-80/1710 7 pR/hr MATERIAL RECOVERED:
Pipe coupling (350 pR/hr)
Dirt (10 pR/hr)
SOIL SAMPLES:
BLSS-3, BLSS-5 (Contaminated soil), BLSS-22 (Gl)
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- TABLE 2 (Cont'd)
POSITION 'H' OPENED: 5-2-80/1325 10 pR/hr
~ CLOSED: 5-2-80/1640
<8 pR/hr MATERIAL RECOVERED:
Coveralls Shoe. Covers (7 pR/hr)
Blotter paper Cloves (7 pR/hr)
Wire brushes SOIL SAMPLES:
BLSS-1, BLSS-4 POSITION
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OPENED:
5-4-80/0820 40 pR/hr CLOSED: 5-4-80/1600 7.0 pR/hr l
MATERIAL RECOVERED:
i Pipe coupling - (d.9 mR/hr)
Coveralls l
' Plastic bag (30 pR/hr)
SOIL SAMPLES:
BLSS-10, BLSS-11, BLSS-12 l
- POSITIONS
'J'
'K' OPENED: 5-4-80/1820 15 pR/hr
_-CLOSED: 5-10-80/1400 9.8 pR/hr u
l HATERIAL RECOVERED:
Shoe Covers-Floor Sweepings Plywood Step-Off Pads Coveralls (250 pR/hr)
Filters (Diesel Gen. Air Intake) (0.2 mR/hr)
Cloves 1(0.7 mR/hr)
SOIL SAMPLES:
BLSS-14, BLSS-18, BLSS-21 t
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- Positions J and K formed the north and south boundaries for a large area (approximately ;5 to 30 feet-wide -and 100 feet long). This arca was exca-
-vated over a period of six' days (from 5-4-80 to 5-10-80).
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TABLE 2' (Cont'd)
- POSITION
'L' OPENED: 5-4-80/1600 43 pR/hr CLOSED: 5-4-80/1806 8.pR/hr
' MATERIAL RECOVERED:
Concrete Contaminated Dirt SOIL SAMPLE: BLSS-13 POSITION 'M' OPENED: 5-5-80/1018 18 pR/hr CLOSED: 5-5-80/1030 6.0 pR/hr MATERIAL RECOVERED:
Coveralls (1-2 mR/hr)
SOIL SAMPLE: BLSS-16 POSITION 'N' -
OPENED: 5-10-80/1600 10 pR/hr CLOSED: 5-10-80/1630 6 pR/hr MATERIAL RECOVERED:
Coveralls % 1 mR/hr Gloves Soil SOIL SAMPLE: BLSS-29 POSITION 'O' i
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OPENED: 5-10-80/1700 25 pR/hr CLOSED: 5-10-80/1900 11.5 pR/hr REOPENED: 5-11-80/0930 CLOSED:
5-11-80/1015 10 pR/hr MATERIAL RECOVERED:
Ceneral waste and soil SOIL SAMPLE: BLSS-30 4
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TABLE 2 (Cont'd)
~ POSITION 'P' OPENED: 5-11-80/1020 11 pR/hr CLOSED: 5-11-80/1100 7 pR/hr MATERIAL RECOVERED:
General debris ~and source marked "Achtung/ Attention: Radioactive SOIL SAMPLE: BLSS-31 POSITION 'Q' OPENED:
5-11-80/1120 10 UR/hr CLOSED: 5-11-80/1155 7 pR/hr MATERIAL RECOVERED:
General debris 1/4. SS tubing (300 pR/hr)
SOIL SAMPLE: No sample taken POSITION 'R' OPENED: 5-11-80/1100 100 pR/hr CLOSED: 5-11-80/1120 7 pR/hr MATERIAL RECOVERED:
General debris l
SOIL SAMPLE: BLSS-32 1
POSITION 'S'
.l OPENED: 5-13-80/1600 9.8 pt/hr CLOSED: 5-13-80/1720 7
pR/hr MATERIAL REMOVED:
Cloves, boots SOIL SAMPLE: BLSS-35 e
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TABLE 2 (Cont'd)
POSITION
'M-l' OPENED:
5-11-80/1359 11 pR/hr CLOSED:
5-11-80/1415 6 pR/hr MATERIAL RDiOVED:
Contaminated dirt General debris SOIL SAMPLE: BLSS-33 i
POSITION
'M-2 '
OPENED: 5-11-80/1405 11 pR/hr i
CLOSED: 5-11-80/1433 6 pR/hr MATERIAL REMOVED:
Gloves '.15 mR/hr SOIL SAMPLE: None"taken POSITION
'D-l' OPENED: 5-11-80/1439 11 pR/hr CLOSED: 5-11-80/1600 8 pR/hr MATERIAL REMOVED:
General debris SOIL SAMPLE: BLSS-34 1
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POSITION 'K1' OPENED: 5-10-80/1030 11 pR/hr CLOSED: 5-10-80/1130 8.9 pR/hr MATERIAL REMOVED:
General debris SOIL SA!!PLE: BLSS-26 POSITION 'K2" OPENED: 5-10-80/1140 25 pR/hr CLOSED: 5-10-80/1400' 8.6 pR/hr MATERIAL REMOVED:
Coveralls, gloves SOIL SAMPLE: BLSS-27 POSITION 'L1' OPENED: 5-10-80/1430 11 pR/hr CLOSED: 5-10-80/1545 8.0 pR/hr l
MATERIAL REMOVED:
Floor sweepings, coveralls SOIL SAMPLE: BLSS-28
~i POSITION 'G1, C2' OPENED: 5-8-80/1200 100 pR/hr CLOSED: '5-8-80/1430
<10 pR/hr MATERIAL REMOVED:
2 scall springs.(25 mR/hr, 35 mR/hr)
SOIL SAMPLE: BLSS-22 l
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TABLE 2 (Cont'd)
POSITION 'H1, !!2 '
OPENED: 5-8-80/1500 120 pR/hr CLOSED: 5-8-80/1700 8.2 pR/hr MATERIAL REMOVED:
General. Debris I'
SOIL SAMPLE: ~BLSS-23 POSITION 'J-4' OPENED:- 5-8-80 Rained out and closed REOPENED: 5-9-80/1500 CLOSED:
5-9-80/1830 9.8 pR/hr SOIL S MPLE: BLSS-24 POSITION-'J-5' l
OPENED: 5-9-80/1835 16 pR/hr CLOSED FOR NICllT:
5-9-80 i.
REOPENED: 5-10-80/0800 CLOSED:.5-10-80/1015 8.4 pR/hr HATERIAL REMOVED:
Contaminated debris SOIL SAMPLE:
BLSS-25 l
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TABLE 3 AIR SAMPLES TAKEN DURIh'C RECOVERY OPERATIONS AT BRUNSWICK COUNTY LANDFILL SAMPLE NUF03ER LOCATION DATE/ TIME FESULTS (pCi/m )
54 BLAP-1
'H' 05-02-80/1325 Mn 8.802 3.041 60 BLAP-2
'H' 05-02-80/1347 Co 8.890 2.156 4
BLAP-3
'F' 05-02-80/1725 IIn 5.729 2.274 54 BLAP-4
'F' 05-03-80/0900 tin 1.77 0.ME+0 60 Co 1.06 0.15E+0
+
54 BLAP-5
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05-03-80/1408 in 2.27 0.25E+0
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60Co 2,09 0.29E+0 54 BLAP-6
'E' 05-03-80/1517 Mn 5.01 2 0.35E+0 60
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Co 4.38 0.42E+7 54 BLAP-7
'E' 05-03-80/1602 11n 1.29 0.27E+0 0 Co 1.31 0.26E+0 54 BLAP-8
'E',
05-03-80/1834 Mn 1.91 0.36E+0 Co 2.31 0.21E+0 i
BLAP-9
'I' 05-04 54
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Mn 2.16 0.32E+0 60Co 1.90 0.31E+0 54 BLAP-10
'I' 05-04-80/1020 Fin 2.50 0.27E+0 Co 2.07 0.25E+0 BLAP-11
'I' 05-04-80/1230 Mn 1.17 2 0.17E+0 60Co 0.759 i.'152 M
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TABLE 3 (Cont'd)
SAMPLE NUMBER.
LOCATION DATE/ TIME RESULTS (pCi/m )
54 BLAP-12~
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05-04-80/1453 Mn 1.39 0.17E+0 60Co 1.23 0.27E+0 54 BLAP-13
'I' 05-04-80/1550 Mn 3.16 0.42E+0 60Co 4.77 0.53E+0' 54 BLAP-14
'L' 05-04-80/1825 11n 1.86 2 0.38 60Co 1.64 0.33 I
54 l
BLAP-15
'J' 05-04-80/1610 bin 2.21 0.23 60Co 1.98 0.16 i
54 BLAP-16
'E' 05-05-80/0832 Mn 3.23 0.35 60 f
Co 2.39 0.44 54 BLAP-17
'M' 05-05-80/1004 Mn 3.31 0.48 60 Co 2.86 0.57 54 BLAP-18
'B' 05-05-80/1115 Mn 3.46 0.34 l
60Co 3.24 0.31 54 BLAP-19
'J' 05-05-80/1600 11n 1.71 0.15 60Co 1.09 !*0.18
.l 54 l'
BLAP-20
'C' 05-06-80 11n 2.99 0.30 I'
60 4 -
Co 3.19 0..' "
54 BLAP-21~
'A' 05-06-80/1133 11n 2.35 0.31 Co 2.2110.34 I
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TABLE 3 (Cont'd)
SAMPLE Nta!BER LOCATION DATE/ TIME RESULTS (pCi/m )
54 BLAP-22
'A' 05-06-80/1312 tin 5.60 0.43 60Co 4.88 0.62 54 BLAP-23
'J' 05-06-80/1511 in 5.61
.32 60Co 4.63 0.39 54 BLAP-24
'J' 05-06-80/1532 1tn 1.85 0.20 60Co 1.89 0.21 BLAP-25 General Area 05-06-80/1711 All Radionuclides (Public Exposure)
<MDA 54 BLAP-26
'G' 05-08-80/1240 Mn 2.48 -
.30 60Co 2.02
.40 54 BLAP-27
'H' 05-08-80/1505 Mn
.901 1.27 60Co 1.13
.33 BLAP-28
'J' 05-08-80/1800
'Mn 2.07
' O. 24 60Co 0.635 1.272 54 BLAP-29
'J' 05-09-80/1500 tin 1.05
.02 60Co 0.905 : 0.125 54 BLAP-30
'J' 05-09-80/1839 Mn
.837 0.24 5 60
{
Co
.884
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54 BLAP-31
'J'
. 05-10-80/0821 hn 0.76 0.14 i
Co 0.89 0.14
TABLE 3 (Cont'd)
SAMPLE NUMBER LOCATION DATE/ TIME RESULTS'(pCi/n )
4 1.
54
'K' 10-80/1042 Mn 0.745
.227 BLAP-32 60Co 0.691
.226 54
'K' 05-10-80/1200 Mn 0.704 ~ 0.228 BLAP-33 60Co 0.912 ! 0.242 4m 4 54
'L' 05-10-80/1437 Mn 0.620 0.27 6 BLAP-34 60Co 1.80 0.38 54
'N' 05-10-80/1617 Mn 0.505
.093 BLAP-35 4
60Co 0.380
.049 i
1 54
'O' 05-11-80/0824 Mn
.813 1.143 BLAP-36 60Co 471 I.165 54 BLAP-37
'P' 05-11-80/1029 Mn
.812
.143 60Co
.575
.151 BLAP-38
'R' 05-11-80/
BLAF-39
'S' 05-13-80/1610 54Hn 0.665 0.003 60Co 0.510 0.169 t-54 BLAP-4 0
'N, L' 05-14-80/0856 Mn 1.19 0.19 60Co 1.27 ! 0.23 1
4 5
04 BLAP-41
'B' 05-14-80/1106 Mn 1.06
.14 Co
.357 !.192
.m.
m m
TAllLE 3 (Cont'd)
SAMPl.E 3
NIHMER T.OCATION DATE/ TIME RESUTTS (pCi/n )
04 BLAP-42
'N' 05-14-80/1351 Mn 0.983 t.24 1 60Co 0.814 2.259 s.
d 54 BLAP-43
'O' 05-14-80f1437 Mn 1.12 1.15 60Co 1,55 'i.20 54 l
BLAP-44
'R' 05-34-80/1804 Mn 2.7
!.34 60 l
Co 2.22 :.22 l
e
,e 4
l l
l e
l l
l l
l l
t one
,. -== - e m. s ee ne e=am
o TABLE 4 ANALYSES OF SOIL SAMPLCS FROM BRUNSWICK COUNTY LANDFILL
~
SAMP',E NUMBER LOCATION DATE RESULTS (pCi/Kg)
BLSS-1
'H' 05-02-80 54tin 432 1 24 60Co 688 1 30 134Cs 56.2 1 13.4 137 Cs 178 1 21 BLSS-2 General 05-02-80 60Co 23.8 i 8.5 Area 137Cs 32.4 1 9.1 BLSS-3
'C' 05-02-80 54Mn 145 1 28 60Co 2470 1 50 137Cs 80.1 1 26.5 BLSS-4
' ll '
05-02-80 60 Co 32 1 8.8 137Cs 41 1 12.3
- BLSS-5
'G' 05-02-80 54Mn 425 1 133 60Co 10,900 1 20 65 2n 1050 1 160 125Sb 1110 1 160 17 Cs 158 i 80 BLSS-6
'F' 05-03-80 Si.}!n 150 1 22 60Co 266 1 23 1
Cs 33.2 1 15.3
~
BLSS-7 Overfill 05-03-60 137Cs 28.3 1 12.2 for.'F'
- This sample was a sample of soil being removed and packaged as contaminated material.
t
TABLE 4 (Cont'd)
SAMPLE NU:!ntR LOCATIO:I DATE RESULTS (pCi/Kg)
BLSS-8
'D' 05-03-80 54Mn 309 1 24 60Co 673 1 28 134Cs 96.3 1 15 137Cs 206 1 23 BLSS-9
'E' 05-03-80 54Fin 278 1 20 60Co 478 1 25 134Cs 150 1 19 137Cs 383 1 22 BLSS-10
'I' 05-04-80 54Mn 114 1 13 60Co 146 1 15 1
Cs 317 1 218 13 Cs 123 1 16 BLSS-11
'I' 05-04-80 5411n 1450 1 40 60Co 1090 1 40 134Cs 94 1 24 1
Cs 183 1 23 BLSS-12
'I' 05-04-80 541tn 2200 1 50 60 Co 1480 i 40 1
Cs 61.1 1 20.5 1
Cs 124 1 24 BLSS-13
'L' 05-04-80
,54thi 804 1 42 Co 1340 1 60 1
Cs 454 1 41 Cs 855 1 49 0
TABLE 4 (Cont'd)
SAMPLE NUMBER LOCATI0tJ, DATE RESULTS (pCi/Kg)
BLSS-14
'J' 05-04-80 51,r 11200 1 500 b Mn 1530 1 80 58Co 488 1 57 59 Fe 357 1 57 60Co 2920 1 100 134Cs 406 1 56 137Cs 450 1 54 BLSS-15
'E' 05-05-80 54Mn 468 1 46 60Co 977 1 69 134Cs 258 1 47 137Cs 680 1 51 BLSS-16
'M' 05-05-80 60Co 95.1 1 13.9 137Cs 34 1 16.5 BLSS-17
'B' 05-05-80 54Mn 892 1 37 60 Co 1560 1 50 134Cs 160 1 31 137Cs 431 _+ 27 BLSS-18
'J2' 05-05-80 54Mn 37.1 _+ 17.1 60Co 106 + 22 134Cs 46 _+ 18.5 137Cs 108 _+ 17 i
l BLSS-19
'c' 05-06-80 54M 2n i 18 60Co 221 _+ 17 137 Cs 99.8 _+ 14.7
- --=
..-o
.m a
e
~
TABLE 4 (Cent'd)
SAMPLE NUMatn LOCATION DATE RESULT 5 (pCi/Kg)
BLSS-20
'A' 03-06-80 54Mn 77.1 1 17.0 60Co 273 1 23 137Cs 65.4 i 14.9 BLSS-21
'J4' 05-07-80 54Mn 514 1 30 60Co 652 1 37 10 Cs 583 1 36 137Cs 930 1 40 BLSS-22
'Gl' 05-08-30 54 Fin 476 1 27 60Co 1260 1 40 137Cs 138 1 19 BLSS-23
'H1; H2' 05-08-80 54Mn 72.1 1 16.7 60Co 161 1 17 1
Cs 71.5 i 13.3 BLSS-24
'J-K' 05-09-80 54Mn 66.3 1 21.4 60Co 119 1 19 134Cs 70.9 i 14.3 17 Cs 123 1 16 BLSS-25
'J-5' 05-10-80 54Fin 347 1 23 60Co 291 1 23 I
Cs 24.1 + 16.3 1
Cs 80.2 1 19.4
- y TABI E 4 (Cont'd)
SAMPLE NUI!nER LOCATION DATE RESULTS (pCi/Kg)
SLSS-26
'K-l' 05-10-80 54 din 1,570 1 40 s
58 Co 102 1 20 60Co 1910 1 50 134Cs 136 1 25 137Cs 251 + 23 BLSS-27
'K-2' 05-10-80 54Mn 342 1 26 60Co 737 1 35 134Cs 58.3 1 21.6 137Cs 155 1 20 BLSS-28
'L-l' 05-10-80 54Mn 142 1 21 60Co 229 1 21 134Cs 80.9 1 10.5 1
Cs 173 1 16 BLSS-29
'N' 05-10-80 60Co 15.3 1 14 1
Cs 70.1 1 17.9 BLSS-30
'O' 05-11-80 54Mn 195 1 20 60Co 377 1 23 134Cs 236 1 22 137Cs 528 1 25 BLSS-31
'P' 05-11-80 54t!n 52.3 1 8.9 60Co 41.5 1 14.0 13 Cs 86.9 1 12.9
>f 5
3'g
9 TABLE 4 (Cont'd)
SAtiPLE NUS115ER LOCATION DATE RESULTS (pC1/K3)
ULSS-32
'R' 05-11-80 60Co 38.2 1 11.3 137Cs 85.9 1 13.?
BLSS-33
'M-l' 05-13-80 54Mn 53.3 1 10.8 60Co 111 1 22 137Cs 85.1 1 15.0 BLSS-34
'D-l' 05-13-80 54Mn 246 1 18 60Co 324 1 24 134Cs 111 1 18 137Cs 164 1 22 BLSS-35
'S' 05-13-80 54tin 419 1 30 60Co 931 1 35 17 Cs 172 1 21 BLSS-36
'K-l' 05-13-80 54}ta 66.8 1 15.1 60Co 170 1 22 BLSS-37
'K-2' 05-13-80 54tin 510 1 26 60Ce 645 1 32 134Cs 65.8 1 23.3 137Cs 196 1 21 BLSS-38
'L-3' 05-13-80 54tin 184 1 22 60Co 163 1 24 13 Cs 150 1 22 1
Cs 187 1 23
TABLE 4 (Cont'd)
SA!!PLE NUMBER LOCATION DATE RESULTS (pCi/Kg)
BLSS-39
'J-5' 05-13-80 54Mn 258 1 25 60Co 350 1 27 134cs 241 1 25 137Cs 326 1 26 BLSS-40
'L' 05-14-80 54tin 95.4 1 19.8 60Co 142 1 17 130Cs 49.7 1 16.2 137Cs 112 1 19 BLSS-41
'B-l' 05-14-80 54Mn 99.7 1 15.3 60Co 246 1 22 137Cs 57 1 24 l
c l
l e
ENVIRO *.WENTAL ASSESSMENT SURVEY Upon comp 1stion of the landfill survey, environmental sampling was initiated to determine it any significant radionuclide pathway to man existed. The pathway of major interest appeared to be a water transport pathway. The landfill soil is sandy and does not retain elements such as the radionuclides deposited there; l
therefore, the contaminants might be leached from the soil by rain and other ground water cources. The area is drained by Beaver Dan Creek which flows south to the Intracoastal Waterway. The surface drainage flows castward to the crcck through a swampy arca of thick vegetation.
The drainage that flows westward is l
collected by a drainage ditch that channels it into Beaver Dam Creek.
Underlying the area at a depth of approximately 30 feet is a stratum of sticky grey clay that has a thickness :of four-to-five fact.
This stratum of clay is highly impermeabic, and it prevents the downward movement of shallow ground water into the underlying aquifers. This is significant inasmuch as the Brunswick County well field is within 0.5 miles. The stratum of grey clay effectively protects the limestone aquifer from any leachate from the landfill. Ground water l
flow from the landfill is believed to be as shown in Figurc 1 i
Figure 4 depicts the proximity of the landfill to the environmental sampling locations. To evaluate a water-fish-man pathway, sampics of sediments and water were taken along the pathway to the Intracoastal Waterway.
There, marine life, as might be consumed by man, var also sampled and assayed.
These results are presented in Table 5.
Approximately one-half mile east of the landfill, there is a water treatment plant which supplies drinking water to Southport and the nearby beach area. The source of watdr for the plant is supplied by a series of wells scattered over approximately a two-square-mile area north and south of the landfill.
The wells extend down from 140 to 170 feet which is into the Castle Hayne Aquifer.
Surface water of the area cannot enter this aquifer because of the stratum of' clay mentioned above, and because of the artesian pressure in the aquifer.
To demon-strate the lack of transport in this pathway, the water from well No. 5, the closest well to the landfill, and composited raw water supply to the treatment plant were sampled. Results of these analyses also appear in Table 5.
The processed water is currently sampled as a part of the plant's ongoing environ-mental program.
During the excavation operation, an environmental sample of air was taken at the north end of the' landfill with prevailing winds from the south. Analysis of the sample demonstrated no detectable radionuclides indicative of plant operations.
O l
'* " 1 TY P L C. AL S E.c.T s o n yu g ov o.g B R.V N 5 b/ tc.K C,0 0N T M L AN O Fith SH owt N cr G R O U N D w A t'E.g.
FLObJ D t R F.C.T I O N S 6E CTl o81 L.'c> o k'.t M G-SourH EAST Wes r MAN.TA BLe p y
Sp in.g Scepge.
p
,, /
l ' / ' / // / / /&
,l% d,/h'/ ///f//////jk)N>#
~'
~
f/J
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. 9.....'.. ?... M.
., '............,,..+-- Lescus rc.,%vc. m v
s'.. -: '.. ',... -
2
~ ~
~
b CAVerdd.w %
<C:2 Cre.e.K 0QN tyg /jr o U n d. l.Ab. ten
/77overn en 6
- - S_7"/C R Y GRC Y C-L A Y. ~ 4 -- - -~
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%i st-g t,. g.7 -
A quirs N NoT* 'fo S C A LC 1
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TABLE 5 ANALYSES OF ENVIRONMENTAL SAP.PLES FROM Tile AREAS AT AND NEAR Tile SOUTilPORT LANDFILL LOCATION MEDIA DATE COLLECTED ANALYSES Each Ditch at Water May 1, 1980 54Mn 4.46 + 1.28 pci/l Landfill Each Ditch at Soil May 1, 1980 137 Cs 16.5 1 14 4 pCi/Kg Landfill (Dry)
West Ditch at Water May 1, 1980
- [ MDA Landfill
[20,000 Sec. Count 1 Liter Sampic Celi Detector]
West Ditch at Soil May 1, 1980 54Mn 96 1 23.1 pCi/Kg Landfill 60Co 103 1 29 pci/Kg 137Cs 551 1 33 pCi/Kg
[Kg is Dry Weight]
Hwy 211 at Water May 1, 1980 j:,MDA Beaver Dam Creek Hwy 211 at Soil May 1, 1980 137Cs 714 1 37 pC1/Kg l
Beaver Dam
[ Dry Weight]
Creek i
Downstream at Water May 1, 1980
- MDA Beaver Dam
[20,000 Sec. Count Creek 1 Liter]
Downstream at Sedinent May 1, 1980 137Cs 341 1 35 pCi/Kg Beaver Dam
[Kg Dry Weight]
l Creek Brunswick County Water May 1, 1980 jiMDA Well No. 5
[20,000 Sec. Count 1 Liter]
e l
Brunswick County Water May 1, 1980
- E HDA Raw Water
[20,000 Count j
1 Liter]
l
]
~
..- =
~
~
TABLE 5 (CONT'D) r 4
LOCATION MEDIA
- DATE COLLECTED
- ANALYSES Sediment May 5, 1980
< MDA Intracoastal Waterway at Mouth of Beaver Dam Creek l
- Intracoastal Seafood eMay 8, 1980 1370s 23.1 i 7.4 pci/Kg(Wet) l Waterway (fish, squid, crab)(composited)
.1 Intracoastal Oysters May 8, 1980
< MDA
~
Waterway l
Intracoastal Surface May 8, 1980
< MDA Waterway j
i E
9 i
6 4
j i.
6
.h_ _ _ _ _ _ _ _ _.
.m_m_
__...___m._
.___s
TABLE 5 ANALYSES OF E WIRONMENTAL SAMPLES FROM THE AREAS AT AND NEAR Ti1E SOUT11 PORT LANDFILL LOCATION MEDIA DATE COLLECTED ANALYSES Each Ditch at Water May 1, 1980 54Mn 4.46 + 1.28 pCi/l Landfill Each Ditch at Soil May 1, 1980 137 Cs 16.5 + 14.4 pCi/Kg Land fill (Dry)
West Ditch at Water May 1, 1980
< MDA Landfill
[20,000 Sec. Count 1 Liter Sample GeLi Detector]
West Ditch at Soil May 1, 1980 54Mn 96 1 23.1 pCi/Kg Landfill 60Co 103 1 29 pC1/Kg 137Cs 551 1 33 pC1/Kg
[Kg is Dry Weight]
Hwy 211 at Water May 1, 1980 1 MDA Beaver Dam Creek Hwy 211 at Soil May 1, 1980 137Cs 714 1 37 pCi/Kg Beaver Dam
[ Dry Weight]
Creek Dawustream at Water May 1, 1980
$ EJA Beaver Dam
[20,000 Sec Count Creek 1 Liter]
Downstream at Sediment May 1, 1980 137Cs 341 1 35 pCi/Kg Beaver Dam
[Kg Dry Weight]
Creek
' Brunswick County Water May 1, 1980
$ MDA Well No. 5
[20,000 Sec. Count 1 Liter]
Brunswick County Water May 1, 1980 j:_MDA Raw Water
[20,000.pount 1 Liter]
e
CROUND WATER MONITORING In order to monitor any transport of radioactivity from the landfill, 17 monitoring wells have been drilled about the landfill to enable the sampling of the ground waters. These are located so indicated in Figure 5.
Figure 6 describes the depth and casing specifications of the wells. Analyses of water wells have not demonstrated any radioactivity in excess of the minimum detectable activitics of the counting system. Table 6 presents these results.
In an effort to continue to monitor tha possibility of migration of any radio-active materials possibly still present in the landfill, water from these wells will be sampled on a quarterly banis for one year. At the end of one year, the results will be reviewed and the sampling frequency will be reevaluated.
In addition to these samples, water from upstream and downstream locations on Beaver Dam Creek will be analyzed on a quarterly basis for one year as will water from Well 5 of the nearby county well field.
Sediment samples will be taken at the water sampling sites on the creek and analyzed for principle gamma emitters.
F e
MM m
O Ma
\\
llW. 211 i
...[ ;.. -...
ll, O4g N
ll
' W th
, 3:
t68 l
8 v
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g.
,, '. ' j...-
.,/
tG k l O'
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/
g g
/
/..'s' '.
Op in
- j
/,/ r/ / g wm '. -
- f. w
. a,.
.- c
.s s
.. ' '. ' ' j,..,
0
/
~..
5A
..,./
6
/,A.,/ Og
/ / / k,/
6O A
/
o ll 5
- h!. T. S.
1 A =~tz',
T pas i
C = ~-5$,
SkercW Ivi/ P OF LANol~lLL AIZE4 GWCWING LCCAT! OMS O*'
MONITCG WELL stTEs.
P ic.u cz e-E
~
2 *.r. s 9e
~7 te w_ ___
d YATEC'. TABLE h
q l
e V
W mm m
D t h.. cat.v. FIPE eo o
.m a
I't'Plc 6.L Sect!ct4 MONIToE WEa SITE-go,q
~
I~ I G U 17 E G
C c.t.sv.<w es nfu
- * ~ ~ ~
TABLE 6 Well_
Well 1A
<MDA SB 40A 1B
<MDA SC 4!DA
~ 2A
<MDA 6A CIDA 2B
<MDA 6B
<MDA L
3A
<MDA 7A
<MDA f
3B -
<MDA-7B
<MDA 4A
<MDA 8A CIDA 4B
<MDA 8B
<MDA SA
<MDA l
MINIMUli DETECTIBLE ACTIVITIES 134CS 4.43pCi/1 51 27 pCi/1 Cr-137Cs 3.8 pCi/1 54 3.58 pCi/1 Mn 131 5 3 pCi/1
. 59Fe 7.7 pci/1 57Co 1.99 pCi/1 58co 4.7 pC1/1 60 o 2.93 pCi/1' C
652n 6.85 pCi/1
{
~
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e m-p*
M '
e N
=
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- w,,
W
'B-M eue. <
.,e, w
ge.
e 9
e m-get e p*WS*&
W G
Oe O.
g.e
=w.e e
.'}
8
't.
SURVEYS OF OTHER BRUNSWICK COUNTY LANDFILLS IN LELAND, OCEMI ISLE, AND CEDAR GROVE, NORTil CAROLINA The survey of the three landfills was performed by CP&L personnel accompanied by a representative of the NRC or the state of North Carolina.
Instrumentation used included a Victorcen Thyac III and an Eberline Micro-R-Meter and Rascal.
The survey was performed on foot with a pass being made approximately every ten feet until the entire area of the landfill had been covered. The detector was held at or near the curface of the ground. Tabic 1 describes the findings of the surveys.
~
l l
l l
l l
l I
1 TABLE 7 RESULTS OF SURVEYS PERF01'JtED AT BRUNSWICK COUNTY LANDFILLS IN LELAND, OCEAN ISLE, AND CEDAR GROVE, NORTH CAROLINA Leland Landfill Date of. Survey: 5-28-80 Instrumentation used: Rascal and Thyac III Results: No significant radiation detected; background range was 3,000-5,000 cpm with Rascal.
4 i
Ocean Isle Landfill Date of Survey: 5-28-80 Instrumentation used: Rascal and Thyac III Results: No significant radiation detected; background range was 1,500-3,000 cpm with Rascal.
Cedar Grove Landfill Date of Survey:
5-7-80 Instrumentation used: Micro-R-Meter Results: No significant radiation detected; background range was 1-2 pR/hr.
j 4
1 9
e t
9 i
DOSES TO PUBLIC In an effort to evaluate radiation exposure to the general public, detailed dose evaluations were conducted on the bulldozer operator at the landfill.
He was offered and accepted a whole body count at the Brunswick Steam Electric Plant whole body counter. This was performed on May 1, 1980. The count indicated no body burdens of radioactivity other than that of natural origin above the minimum detectible limits of the system.
Irt addition, a large volume air ' sample was taken N100 yards downwind of the i
excavation operation. This was BLAP-25 of Table 3 and indicates no detectible
- activity, t
The maximum annual dose to an individual would be an estimate of the dosa to the
' landfill employee who operates the bulldozer.
This is estimated with the following i
assumptions.
1.
The maximum exposure time was only those hours the landfill was open - 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> per week.
j 2..
The maximum dose rate at three feet above the ground is estimated as being 25 pR/hr or 20 pR/hr above background.
3.-
The maximum exposure to intensities of (2) would be no greater than 1/10 the total exposure time.
This is due to the earth moving activities of the s
operator and his normal routine as observed for two weeks.
j The assumptions yield an estimate of approximately six millirem / year as a highest expected value. Any other exposures would be comparatively insignificant to this estimate since the landfill is locked after operating hours discouraging tres-passing. People using'the landfill come in, unload their cargo in the assigned i
larca, and leave, affording them only a limited period for any possible exposure.
5 4
9 4
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