ENSR AECOM MEMO RE: DATA VALIDATION RADIOLOGICAL …

ENSR AECOM

ENSR 2 Technology Park Drive, Westford, Massachusetts, 01886-3140 T 978.589.3000 F 978.589.3100 www.ensr.aecorn.com

Memorandum

Date:

To:

From:

Subject:

January 30, 2006 Revised October 18, 2007

Lisa Bradley/Westford

Lisa Krowitz/Westford

Data Validation Radiological Analyses Yard 520 Pines Area of Investigation, Indiana GEL SDG Number 146464

Distribution: D. Simmons/Westford

SUMMARY

Privileged and Confidential Attorney-Client Work Product

01776-022-106 PI013rad.rev.doc

Full validation was performed on the data for 11 soil samples and one equipment blank analyzed for Actinium-227 (Ac-227), Lead-210 (Pb-210), Polonium-21 O (Po-210), Protactinium-231 (Pa-231 ), Radium-226 (Ra-226), Radium-228 (Ra-228), Thorium-228 (Th-228), Thorium-230 {Th-230), Thorium-232 (Th-232), Uranium-234 (U-234), Uranium-235 (U-235), and Uranium-238 (U-238) by DOE EML HASL-300 (soil samples) and EPA 901.1 (aqueous sample). The samples were collected at Yard 520 Pines Area of Investigation in Pines, Indiana on September 23, 2005 and submitted to General Engineering Laboratories (GEL) in Charleston, South Carolina for analysis. GEL processed these samples under sample delivery group (SDG) number 146464. The analytical data were evaluated with ref,~rence to the Department of Energy "Evaluation of Radiochemical Data Usability'' (1997) and the quality control (QC) criteria specified in the analytical method and/or the Yard 520 Quality Assurance Project Plan (QAPP).

In general, the data are valid as reported and may be used for decision making purposes. No data were rejected or qualified as estimated.

SAMPLES

The samples included in this review are listed below.

Sample IDs Sample IDs GP0041CB092305B GP0081CB092305D (equipment blank) (field duolicate of GP0081CB092305S)

GP0041CB092305S GP0091CB092305S GP0051CB092305S GP01 OICB092305S

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Sample IDs GP0071CB092305S GP0081CB092305S

REVIEW ELEMENTS

Sample data were reviewed for the following parameters:

Privileged and Confidential

Attorney-Client Work Product

Sample IDs GP0121CB092305S GP0131CB092305S

• Agreement of analyses conducted with chain-of-custody (COC) requests

• Holding times/sample preservation

• Calibrations

• Laboratory method blanks/equipment blanks

• Matrix spike (MS) results

• Laboratory control sample (LCS) results

• Laboratory duplicate results

• Field duplicate results

• Sample quantitation/detection limit results

DISCUSSION

Agreement of" Analyses Conducted With COC Requests

Sample reports were reviewed against the analytical requests as designated on the chain-of-custody (COC) and subsequent communications between ENSR and the laboratory. No discrepancies were noted. ·

Holding Times/Sample Preservation

All samples were prepared and analyzed within the method-specified holding times. No issues with sample preservation were noted upon receipt in the laboratory.

Calibrations

All criteria were met for energy and efficiency calibrations and instrument backgrounds.

Laboratory Method Blanks/Equipment Blanks

Sample GP0041CB092305B was submitted as the equipment blank with this data set. There were no contaminants detected above the minimum detectable concentrations (MDCs)/detection limits (DLs} for all the parameters in the laboratory method and equipment blank.

MS Results

The MS analysis was performed on a non-Pines aqueous sample. Note that MS analysis is not applicable to soil samples analyzed by gamma spectroscopy. The MS was spiked with Am-241, Cs-

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137, and Co-60. The percent recoveries (%Rs) met the QC acceptance criteria of 75-125% for all MS parameters.

LCS Results

LCSs were analyzed for both the aqueous and soil matrices. The LCS was spiked with Am-241, Cs-137, and Co-60. All LCSs %Rs met the acceptance criteria for all parameters.

Laboratory Duplicate Results

Laboratory duplicate analyses were performed on an aqueous non-Pines sample and on soil sample GP0011 ICB092305S.

The relative percent differences (RPOs) met the QC acceptance criteria of 20% RPO for aqueous samples and 35% RPO for soil samples (if both results are greater than five times the MOC/OL). The laboratory duplicate results were either not detected or detected at concentration less than 5x the MOC/OL for all parameters. Precision was deemed acceptable.

Field Duplicate Results

The field duplicate pair submitted with this data set was GP0081CB092305S and GP0081CB0923050. The following table summarizes the RPOs of the detected nuclides in the field duplicate pair.

Nuclide GP0081CB092305S GP0081CB092305 %RPO (pCi/g) (pCi/g)

Pb-210 2.10 + 3.37 u 4.55 + 2.30 NC Po-210 2.10 + 3.37 u 4.55 + 2.30 NC Ra-226 I 3.06 + 0.108 3.25 + 0.118 10 Th-230 3.06 + 0.108 3.25 + 0.118 10 Ra-228 2.29 + 0.176 2.52 + 0.180 10 Th-228 2.34 + 0.067 2.42 + 0.066 3 Th-232 2.28 + 0.065 2.37 + 0.065 4 U-234 3.49 + 0.132 3.40 + 0.136 3 U-235 0.146 + 0.160 u 0.282 + 0.146 NC U-238 3.10 + 1.03 2.20 + 1.33 34

NC - Not calculated since one result was not detected.

The RPOs (where calculated) for all the nuclides met the QC acceptance criteria of + 50% for a soil matrix., These results are considered usable.

For Pb-210, Po-210, and U-235, the field duplicate results were less than 1 O times the MOC/OL and the differences were less than 8 times the MOC/OL. Therefore, no qualifications were required for the Pb-210, Po-210, and U-235 results. These results are considered usable.

Sample Quantitation/Detection Limit Results

The results for Pb-210, Po-210, Ra-226, and Th-230 were reported as individual values on the GEL Certificate of Analysis sheets.

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Negative and zero results were reported for some samples, but were flagged with a "U" by GEL as being not detected. These results were reported as not detected (U) at the value reported by the laboratory.

Results reported below the MDC were flagged with a "U" by GEL as being not detected. These results were reported as not detected (U) at the value reported by the laboratory.

Positive results were reported below the project RL, but above the MDC. These results were reported as positive at the value reported by the laboratory.

The following table summarizes the samples for which the laboratory MDCs/DLs were greater than the RLs, and the results were not detected above the MDCs/DLs. These results were reported as not detected (U) at the value reported by the laboratory

Sample ID Nuclide Sample Result MDC/DL RL (pCi/g) (pCi/g)

GP0051CB092305S Ac-227 0.289 u 0.296 0.160 Pb-210 3.22 u 4.86 3.00 Po-210 3.22 u 4.86 3.00

GP0081CB092305S U-238 0.146 u 0.185 0.100 GP0121CB092305S Pa-231 0.772 u 0.977 0.500

The laboratory indicated in the case narrative that these samples did not meet the required reporting limit due to receipt of small sample aliquots.

The laboratory qualified the following sample results with "UI" to indicate "uncertain identification for gamma spectroscopy''. This qualifier was removed and the following actions taken.

Sample ID Analyte Qualifier Reason Action

GP0041CB092305B Thorium-228 No valid peak Report nondetect at MDC/DL

Thorium-232 No valid peak Report nondetect at MDC/DL

GP0091CB092305S Actinium-227 Low abundance Report nondetect at MDC/DL

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Certificate of Analysis

Company : ENSR International Address : 2 Technology Park Drive

Westford, Massachusetts 01886--3140

Contact:

Project:

Ms. Debra L. McGrath

Indiana Pines Yard 520

Client Sample ID: Sample ID: Matrix: Collect Date: Receive Date: Collector:

GP004ICB092305B 146464012 Water 23-SEP-05 09:45 26-SEP-05

Parameter Qualifier Result Uncertainty DL Rad Gamma Spec Analysis

Gammaspec, Gamma, Liquid (Long List) Actinium-227 u -26.3 +/-35.1 59.5 Lead-210 u 305 +/-898 1440 Polonium-210 u 305 +/-898 1440 Protactinium-231 u 14.6 +/-145 254 Radium-226 u 8.48 +/-12.3 13.6 Radium-228 U, 12.1 +/-16.4 22.3 Thorium-228 uvf 0.00 +/-8.98 8.92 Thorium-230 u 8.48 +/-12.3 13.6 Thorium-232 uyt' 0.00 +/-8.74 8.68 Uranium-234 u 11.4 +/-12.4 22.5 Uranium-235 u 11.6 +/-28.1 37.5 Uranium-238 u 161 +/-346 347

The following Analytical Methods were performed Method Description

EPA 901.1

32

RL

750

20.0

20.0

50.0 250

Report Date: October 22, 2005

Proiect: ENSR00205 Client ID: ENSR003

Units

pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L pCi/L

DF AnalystDate Time Batch Method

MJHl 10/20/05 2209 470456

Analyst Comments




Westford, Massachusetts 01886--3140 Report Date: October 22, 2005

Contact:

Project:


lndfana Pines Yard 520


GP004ICB092305S 146464001 Soil 23-SEP-05 09:30 26-SEP-05 Client

Parameter Qualifier :R.esult Uncertainty DL

:R.ad Gamma Spec Analysis

Gammaspec, Gamma, Solid (Long List) Actinium-227 U Lead-210 U Polonium-210 U Protactinium-231 U Radium-226 Radium-228 Thorium-228 Thorium-230 Thorium-232 Uranium-234 Uranium-235 Uranium-238

-0.0952 2.13 2.13

0.107 2.19 1.41 1.63 2.19 1.59 2.55

0.272 2.53

The following Prep Methods were performed Method Description

+/-0.240 +/-1.81 +/-1.81

+/-0.829 +/-0.255 +/-0.236 +/-0.149 +/-0.255 +/-0.145 +/-0.283 +/-0.191

+/-1.26

Dry Soil Prep Dry Soil Prep GL-RAD-A-021


EML HASL 300, 4.5.2.3

0.369 2.39 2.39 1.47

0.0613 0.113

0.0528 0.0613 0.0515

0.129 0.206

1.08

21

:R.L

0.160 3.00 3.00

0.500 0.200 0.300 Q.400 0.500 0.400

3.00 0.100 0.500

Analyst

AXP2


Units DF AnalystDate Time Batch Method

pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g

MJHl 10/17/05 1027 467582

Date Time Prep Batch

09/27/05 2107 466662

Analyst Comments

GENERAL ENGINEERING LABORATORIES, LLC 2040 Savage Road Charleston SC 29407 - (843) 556-8171 -www.gel.com




Contact:

Project:




f



Gammaspec, Gamma, Solid (Long List) Actinium-227 U Lead-210 U Polonium-210 U Protactinium-231 U Radium-226 Radium-228 Thorium-228 Thorium-230 Thorium-232 Uranium-234 Uranium-235 Uranium-238

0.289 3.22 3.22

-0.642 3.23 2.59 2.63 3.23 2.56 3.66

0.238 2.86


+/-0.206 +/-4.64 +/-4.64

+/-0.709 +/-0.102 +/-0.131

+/-0.0649 +/-0.102

+/-0.0634 +/-0.127 +/-0.162 +/-0.971



EML HASL 300, 4.5.2.3

0.296 4.86 4.86 1.12

0.0478 0.0838

0.050 0.0478 0.0488 0.0956

0.167 1.19

22

RL

0.160 3.00 3.00

0.500 0.200 0.300 0.400 0.500 0.400

3.00 0.100 0.500

Analyst

AXP2


Units DF AnalystDate Time Batch Method

pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g

MJHl 10/17/05 1045 467582


09127105 2107 466662

Analyst Comments





Contact: Project:

Parameter




Qualifier Result

Rad Gamma Spec Analysis

Gammaspec, Gamma, Solid (Long List) Actinium-227 u -0.0537 Lead-210 4.21 Polonium-210 4.21 Protactinium-231 u -0.475 Radium-226 3.49 Radium-228 3.00 Thorium-228 2.92 Thorium-230 3.49 Thoriuni-232 2.85 Uranium-234 3.94 Uranium-235 0.246 Uranium-238 4.14


GP006ICB092305S 146464003 Soil 23-SEP-05 10:50 26-SEP-05

Uncertainty DL

+/-0.216 0.371 +/-0.638 0.470 +/-0.615 0.470 +/-0.848 1.44 +/-0.327 0.0672 +/-0.374 0.120 +/-0.305 0.0517 +/-0.327 0.0672 +/-0.297 0.0504 +/-0.442 0.125 +/-0.169 0.197 +/-0.893 0.534



EML HASL 300, 4.5.2.3

23


RL Units DF AnalystDate Time Batch Method

0.160 pCi/g MJHl 10/17/05 1116 467582 3.00 pCi/g 3.00 pCi/g

0.500 pCi/g 0.200 pCi/g 0.300 pCi/g 0.400 pCi/g 0.500 pCi/g 0.400 pCi/g 3.00 pCi/g

0.100 pCi/g 0.500 pCi/g

Analyst Date Time Prep Batch

AXP2 09/27/05 2108 466662

Analyst Comments





Contact:

Project:

Parameter




Qualifier Result


Gammaspec, Gamma, Solid (Long List) Actinium-227 u 0.0474 Lead-210 5.61 Polonium-210 5.61 Protactinium-231 u -0.598 Radium-226 4.22 Radium-228 2.87 Thorium-228 3.21 Thorium-230 4.22 Thorium-232 3.14 Uranium-234 4.71 Uranium-235 0.337 Uranium-238 4.17


GP007ICB092305S 146464004 Soil 23-SEP-05 11 :20 26-SEP-05

Uncertainty DL

+/-0.276 0.461 +/-0.885 0.572 +/-0.857 0.572

+/-1.08 1.78 +/-0.399 0.0814 +/-0.399 0.148 +/-0.338 0.0627 +/-0.399 0.0814 +/-0.331 0.0614 +/-0.547 0.167 +/-0.224 0.238 +/-0.966 0.670



EML HASL 300, 4.5.2.3

24




0.500 pCi/g 0.200 pCi/g 0.300 pCi/g 0.400 pCi/g 0.500 pCi/g 0.400 pCi/g

3.00 pCi/g 0.100 pCi/g 0.500 pCi/g


AXP2 09/27/05 2108 466662

Analyst Comments



Company : ENSR International Address : 2 Technology Parle Drive


Contact: Ms. Debra L. McGrath

Project: Indiana Pines Varel 520


GP008ICB092305S 146464005 Soil 23-SEP-05 11 :55 26-SEP-05 Client


Gammaspec, Gamma, Solid (Long List) Actinium-227 u 0.0408 +/-0.277 0.333 Lead-210 u 2.10 +/-3.37 3.49 Polonium-210 u 2.10 +/-3.37 3.49 Protactinium-231 u 0.175 +/-0.770 1.32 Radium-226 3.06 +/-0.108 0.054 Radium-228 2.29 +/-0.176 0.102 Thorium-228 2.34 +/-0.0669 0.0477 Thorium-230 3.06 +/-0.108 0.054 Thorium-232 2.28 +/-0.0651 0.0464 Uranium-234 3.49 +/-0.132 0.108 Uranium-235 u 0.146 +/-0.160 0.185 Uranium-238 3.10 +/-1.03 1.15




EML HASL 300, 4.5.2.3

25





0.100 pCi/g 0.500 pCi/g


AXP2 09127105 2108 466662

Aualyst Comments





Contact: Project:

Parameter




Qualitier Result


Gammaspec, Gamma, Solid (Long List) Actinium-227 u -0.0341 Lead-210 4.55 Polonium-210 4.55 Protactinium-231 u -0.637 Radium-226 3.25 Radium-228 2.52 Thorium-22~ 2.42 Thorium-230 3.25 Thorium-232 2.37 Uranium-234 3.40 Uranium-235 0.282 Uranium-238 2.20


GP008ICB092305D 146464010 Soil 23-SEP-05 11 :55 26-SEP-05 Client

Uncertainty DL

+/-0.198 0.296 +/-2.30 3.15 +/-2.30 3.15

+/-0.712 1.18 +/-0.118 0.0521 +/-0.180 0.097

+/-0.0664 0.0416 +/-0.118 0.0521 +l-0.065 0.0407 +/-0.136 0.097 +/-0.146 0.157 +/-1.33 0.964



EML HASL 300, 4.5.2.3

30

Proiect: ENSR00205 .Client ID: ENSR003


0;160 pCi/g MJHl 10/14/05 2224 467582 3.00 pCi/g 3.00 pCi/g


0.100 pCi/g 0.500 pCi/g


AXP2 09121105 2108 466662

Analyst Comments

GENERAL ENGINEERING LABORATORIES, lLC 2040 Savage Road Charleston SC 29407 - (843) 556-8171 -www.gel.com




Contact:

Project:







Parameter Qualifier Result Uncertainty DL RL Units DF AnalystDate Time Batch Method


Gammaspec, Gamma, Solid (Long List) Actinium-227 Uy! 0.00 +/-0.254 0.458 0.160 pCi/g MJHl 10/14/05 2154 467582 1 Lead-210 6.81 +/-4.63 5.31 3.00 pCi/g Polonium-210 6.81 +/-4.62 5.31 3.00 pCi/g Protactinium-231 u -0.57 +/-1.13 1.87 0.500 pCi/g Radium-226 4.63 +/-0.475 0.0822 0.200 pCi/g Radium-228 2.63 +/-0.371 0.153 0.300 pCi/g Thorium-228 2.85 +/-0.296 0.0665 0.400 pCi/g Thorium-230 4.63 +/-0.475 0.0822 0.500 pCi/g Thorium-232 2.79 +/-0.290 0.065 0.400 pCi/g Uranium-234 5.38 +/-0.597 0.154 3.00 pCi/g Uranium-235 0.347 +/-0.192 0.242 0.100 pCi/g Uranium-238 4.77 +/-1.68 1.54 0.500 pCi/g

The following Prep Methods were performed Method Description Analyst Date Time Prep Batch

Dry Soil Prep Dry Soil Prep GL-RAD-A-021 AXP2 09127105 2108 466662

The following Analytical Methods were performed Method Description Analyst Comments

EML HASL 300, 4.5.2.3

26





Contact:

Project:




GPOl OICB092305S 146464007 Soil 23-SEP.:...05 14:00 26-SEP-05

Parameter Qualifier Result Uncertainty DL


Gammaspec, Gamma, Solid (Long List) Actinium-227 u 0.0565 +/-0.254 0.370 Lead-210 u 2.81 +/-5.20 7.66 Polonium-210 u 2.81 +/-5.20 7.66 Protactinium-231 u 0.298 +/-0.875 1.43 Radium-226 3.40 +/-0.314 0.0605 Radium-228 2.56 +/-0.387 0.114 Thorium-228 2.65 +/-0.248 0.0547 Thorium-230 3.40 +/-0.314 0.0605 Thorium-232 2.58 +/-0.241 0.0533 Uranium-234 3.95 +/-0.423 0.124 Uranium-235 0.223 +/-0.193 0.195 Uranium-238 3.79 +/-1.80 1.53




EML HASL 300, 4.5.2.3

27





0.500 pCi/g 0.200 pCi/g 0.300 pCi/g 0.400 pCi/g 0.500 pCi/g 0.400 pCi/g

3.00 pCi/g 0.100 pCi/g 0.500 pCi/g


AXP2 09/27/05 2108 466662

Analyst Comments





Contact:

Project:




GPOI 1ICB092305S 146464008 Soil 23-SEP-05 12:45 26-SEP-05 Client



Parameter Qualifier Result Uncertainty DL RL Units DF AnalystDate Time Batch Method


Gammaspec, Gamma, Solid (Long List) Actinium-227 U Lead-210 Polonium-210 Protactinium-231 U Radium-226 Radium-228 Thorium-228 Thorium-230 Thorium-232 Uranium-234 Uranium-235 Uranium-238

0.0985 2.88 2.88

0.442 2.43 2.17 2.07 2.43 2.03 2.65

0.203 2.58


+/-0.228 +/-0.511 +/-0.498 +/-0.814 +/-0.253 +/-0.288 +/-0.192 +/-0.253 +/-0.187 +/-0.295 +/-0.198 +/-0.745



EML HASL 300, 4.5.2.3

0.354 0.453 0.453

1.42 0.0638 0.118 0.053

0.0638 0.0517 0.128 0.182 0.517

28

0.160 3.00 3.00

0.500 0.200 0.300 Q.400 0.500 Q.400 3.00

0.100 0.500

Analyst

AXP2

pCi/g MJHl 10/17105 1123 467582 1 pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g


09/27/05 2108 466662

Analyst Comments

GENERAL ENGINEERING LABORATORIES, LLC 2040 Savage Road Charleston SC 29407- (8~3) 556-8171 -www.gel.com




Contact: Ms. Debra L. McGrath

Project: Indiana Pines Yard 520



Parameter Qualifier l{esult lJncertainty DL !{ad Gamma Spec Analysis

Gammaspec, Gamma, Solid (Long List) Actinium-227 lJ Lead-210 Polonium-210 Protactinium-231 U Radium-226 Radium-228 Thorium-228 Thorium-230 Thorium-232 Uranium-234 Uranium-235 Uranium-238

0.0479 2.27 2.27

0.772 3.23 2.12 2.13 3.23 2.07 3.68

0.267 2.62


+/-0.163 +/-1.48 +/-1.47

+/-0.571 +/-0.348 +/-0.270 +/-0.179 +/-0.348 +/-0.174 +/-0.355 +/-0.132 +/-0.962



1 EML HASL 300, 4.5.2.3

0.249 1.62 1.62

0.977 0.0418 0.070

0.0353 0.0418 0.0344 0.0821 0.138 0.735

29

l{L

0.160 3.00 3.00

0.500 0.200 0.300 o.400 0.500 0.400 3.00

0.100 0.500

Analyst

AXP2


lJnits DF AnalystDate Time Batch Method

pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCi/g pCUg pCi/g pCi/g pCi/g pCi/g

MJHl 10/20/05 2116 467582


09127/05 2108 466662

Analyst Comments





Contact:

Project:




GP013ICB092305S " 146464011 Soil 23-SEP-05 13:30 26-SEP-05 Client

Parameter Qualifier Jlesult lJncertainty DL Jlad Gamma Spec Analysis

Gammaspec, Gamma, Solid (Long List) Actinium-227 u -0.0503 +/-0.172 0.255 Lead-210 u 1.55 +/-2.22 2.72 Polonium-210 u 1.55 +/-2.22 2.72 Protactinium-231 u -0.205 +/-0.606 1.00 Radium-226 1.70 +/-0.0809 0.0465 Radium-228 1.49 +/-0.127 0.0812 Thorium-228 1.56 +/-0.0521 0.0375 Thorium-230 1.70 +/-0.0809 0.0465 Thorium-232 1.53 +/-0.0508 0.0366 Uranium-,234 2.06 +/-0.119 0.0886 Uranium-235 u 0.0774 +/-0.128 0.137 Uranium-238 2.30 +/-0.851 0.829




EML HASL 300, 4.5.2.3

31


JlL lJnits DF AnalystDate Time Batch Method



0.100 pCi/g 0.500 pCi/g


AXP2 09/27/05 2108 466662

Analyst Comments

GENERAL ENGINEERING LABORATORIES, LLC 2040 Savage Road Charleston SC 29407 - (843} 556-8171 - www.gel.com

Certificate of Analysis Report for

ENSR003 ENSR International

Client SDG: 146464 GEL Work Order: 146464

The Qualifiers in this report are defined as follows: ** Indicates the analyte is a surrogate compound. < Result is less than amount reported. > Result is greater than amount reported. B Target analyte was detected in the sample as well as the associated blank. BD Results below the MDC or low tracer recovery. E Concentration of the target analyte exceeds the instrument calibration range.

H Analytical holding time exceeded. J Indicates an estimated value. P The response between the confirmation and the primary columns is >40% Different.

R Sample results are rejected. U Target analyte was analyzed for but not detected above the MDL or LOD. UI Uncertain identification for gamma spectroscopy.

x y

z d

Lab-specific qualifier-please see case narrative, data summary package or contact your project manager for details.

QC Samples were not spiked ~ith this compound. Paint Filter qualifier: Particulates passed through the filter. No free liquids were observed. The 2: 1 depletion requirement was not met for this sample

h Sample preparation or preservation holding time exceeded.

Where the analytical method has been performed under NELAP certification, the analysis has met all of the requirements of the NELAC standard unless qualified on the Certificate of Analysis. **Indicates the analyte is a surrogate compound. This data report has been prepared and reviewed in accordance with General Engineering Laboratories, LLC standard operating procedures. Please direct any questions to your Project Manager, Edith Kent.

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ENSR AECOM MEMO RE: DATA VALIDATION RADIOLOGICAL …