URS Corp. - RTP 

1600 Perimeter Park Dr. 

Morrisville, NC 27560

AES ICR Test - Units 1 & 2 

Guayama, PR 

Client # 39682175 

PO # 226013.US

Analytical Report 

(0310-107)

EPA Method 316 

Formaldehyde 

Enthalpy Analytical, Inc. 

Phone: (919) 850 - 4392 / Fax: (919) 850 - 9012 / www.enthalpy.com 

2202 Ellis Road Durham, NC 27703 - 5518 
I certify that to the best of my knowledge all analytical data presented in this report: 

 Have been checked for completeness 

 Are accurate, error-free, and legible 

 Have been conducted in accordance with approved protocol, and that all deviations and analytical 

problems are summarized in the appropriate narrative(s) 

This analytical report was prepared in Portable Document Format (.PDF) and contains  pages. 

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Summary of Results

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Compound Sample ID / Catch Weight (μg)

U1-1 U1-2 U1-3

Formaldehyde 17.6 J 17.4 J 12.4 ND

U2-1 U2-2 U2-3

Formaldehyde 11.3 ND 18.1 J 12.6 ND

U1-FB U1-H2O-RB Eng 14 R3

Formaldehyde 10.3 J 3.22 ND 2 ND

Company

Analyst

Parameters

# Samples

URS Corp.

EO

EPA Method 316

6 runs, 1 RB, 1 FB

Client #

Job #

PO #

Report Date

39682175

0310-107

226013.US

03/23/10

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Results

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MDL 0.0200 (μg/mL) Lower Curve Limit 0.273 (μg/mL)

LOQ 0.273 (μg/mL) Upper Curve Limit 3.28 (μg/mL)

Compound Formaldehyde

Sample ID Lab ID Absorbance

Analytical

Concentration

(μg/mL)

Dilution Volume

(mL)

Catch

Weight

(μg)

Qual

U1-1 Imp 1 11 0.0159 0.0335 1 527 17.6 J

U1-1 Imp 2 & 3 14 0.0032 0.0200 1 177 3.54 ND

17.6 J

U1-2 Imp 1 12 0.0181 0.0382 1 454 17.4 J

U1-2 Imp 2 & 3 15 0.0004 0.0200 1 210 4.20 ND

17.4 J

U1-3 Imp 1 13 0.0050 0.0200 1 618 12.4 ND

U1-3 Imp 2 & 3 16 0.0089 0.0200 1 209 4.18 ND

12.4 ND

U2-1 Imp 1 21 0.0000 0.0200 1 565 11.3 ND

U2-1 Imp 2 & 3 24 0.0000 0.0200 1 212 4.23 ND

11.3 ND

U2-2 Imp 1 22 0.0145 0.0305 1 593 18.1 J

U2-2 Imp 2 & 3 25 0.0000 0.0200 1 156 3.12 ND

18.1 J

U2-3 Imp 1 23 0.0064 0.0200 1 629 12.6 ND

U2-3 Imp 2 & 3 26 0.0000 0.0200 1 153 3.07 ND

12.6 ND

U1-FB Imp 1 17 0.0207 0.0435 1 237 10.3 J

U1-FB Imp 2 & 3 20 0.0067 0.0200 1 209 4.18 ND

10.3 J

U1-H2O-RB 19 0.0049 0.0200 1 161 3.22 ND

Method Blank 10 0.0000 0.0200 1 1.00 0.0200 ND

Method Blank 3 0.0003 0.0200 1 1.00 0.0200 ND

Method Blank 3 0.0009 0.0200 1 1.00 0.0200 ND

Company

Analyst

Parameters

# Samples

URS Corp.

EO

EPA Method 316

6 runs, 1 RB, 1 FB

Client #

Job #

PO #

Report Date

39682175

0310-107

226013.US

03/23/10

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MDL 0.0200 (μg/mL) Lower Curve Limit 0.273 (μg/mL)

LOQ 0.273 (μg/mL) Upper Curve Limit 3.28 (μg/mL)

Compound Formaldehyde

Sample ID Lab ID Absorbance

Analytical

Concentration

(μg/mL)

Dilution Volume

(mL)

Catch

Weight

(μg)

Qual

Company

Analyst

Parameters

# Samples

URS Corp.

EO

EPA Method 316

6 runs, 1 RB, 1 FB

Client #

Job #

PO #

Report Date

39682175

0310-107

226013.US

03/23/10

LD / U1-1 Imp 2&3 4 0.0000 0.0200 1 177 3.54 ND

% Difference NA

AD / U1-1 Imp 2&3 5 0.0000 0.0200 2 177 7.08 ND

%Difference NA

MS / U1-2 Imp 2&3 6 0.5096 1.0727 1 2.50 2.68

Spike Amount 2.73

Native Amount 0.00

Spike Recovery (%) 98.2%

MS / U2-1 Imp 1 4 0.4688 0.9869 1 2.50 2.47

Spike Amount 2.73

Native Amount 0.00

Spike Recovery (%) 90.4%

Spec32pg103 SS#1 8 0.6231 1.3117 1 1.00 1.31

Spike Amount 1.20

Spike Recovery (%) 109%

Spec32pg103 SS#2 9 0.6222 1.3098 1 1.00 1.31

Spike Amount 1.20

Spike Recovery (%) 109%

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Narrative Summary

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Enthalpy Analytical Narrative Summary 

Company URS Corp. - RTP Client # 39682175

Analyst EO Job # 0310-107 

Parameters EPA Method 316 PO # 226013.US 

# Samples 6 runs, 1 RB, and 1 FB Report Date March 23, 2010 

Custody Heather Tarjeft received the samples on 3/18/10 after being relinquished 

by URS Corp. - RTP. The samples were received at 4.2 oC in good 

condition. Prior to, during, and after analysis, the samples were kept 

under lock with access only to authorized personnel by Enthalpy 

Analytical, Inc. 

Analysis The samples were analyzed for formaldehyde using the analytical 

procedures in EPA Method 316, Sampling and Analysis for 

Formaldehyde Emissions from Stationary Sources in the Mineral Wool 

and Wool Fiberglass Industries (40 CFR Part 63, Appendix A). 

The reagents (pararosaniline, sodium sulfite, standards) were made 

following the procedures in Section 7.5. The sodium sulfite reagent was 

used within 24 hours of preparation. Formaldehyde standards were 

made by diluting a certified solution with DI water. Samples and 

standards are analyzed following the procedures in Section 11.0. Any 

sample dilutions were performed on an aliquot of the original sample 

prior to the addition of acetylacetone reagent. 

The Hewlett Packard Model 8452A, Diode Array Spectrophotometer 

("Larry" S/N 2610A 00705) was operated at 570 nm. 

Calibration The calibration curves are located in the Calibration Curve Spectra 

section of this report. 

QC Notes The following Quality Control Samples (9.0) were analyzed: field blank 

(9.2.1), method blank (9.2.3) and an alternate dilution (not required by 

the method). All samples met the method-specified quality control 

limits. 

All sample preparation and analytical holding times specified in the 

method were met. 

Reporting Notes The results presented in this report are representative of the samples as 

provided to the laboratory. 

Enthalpy Analytical, Inc. is accredited to perform this method for 

compliance purposes by the National Environmental Laboratory 

Accreditation Conference (NELAC) through the Louisiana 

Environmental Laboratory Accreditation Program (LELAP), certificate 

number 04010. 

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General Reporting Notes 

The following are general reporting notes that are applicable to all Enthalpy Analytical, Inc. data 

reports, unless specifically noted otherwise.

 The acronym MDL represents the Minimum Detection Limit. Below this value the laboratory cannot 

determine the presence of the analyte of interest reliably. 

 The acronym LOQ represents the Limit of Quantification. Below this value the laboratory cannot 

quantitate the analyte of interest within the criteria of the method. 

 The acronym ND following a value indicates a non-detect or analytical result below the MDL. 

 The letter J following a value indicates an analytical result between the MDL and the LOQ. A J flag 

indicates that the laboratory can positively identify the analyte of interest as present, but the value 

should be considered an estimate. 

 The letter E following a value indicates an analytical result exceeding 100% of the highest calibration 

point. The associated value should be considered as an estimate. 

 The acronym DF represents Dilution Factor. This number represents dilution of the sample during the 

preparation and/or analysis process. The analytical result taken from a laboratory instrument is 

multiplied by the DF to determine the final undiluted sample results. 

 The addition of MS to the Sample ID represents a Matrix Spike. An aliquot of an actual sample is 

spiked with a known amount of analyte so that a percent recovery value can be determined. This shows 

what effect the sample matrix may have on the target analyte, i.e. whether or not anything in the sample 

matrix interferes with the analysis of the analyte(s). 

 The addition of MSD to the Sample ID represents a Matrix Spike Duplicate. Prepared in the same 

manner as an MS, the use of duplicate matrix spikes allows further confirmation of laboratory quality 

by showing the consistency of results gained by performing the same steps multiple times. 

 The addition of LD to the Sample ID represents a Laboratory Duplicate. The analyst prepares an 

additional aliquot of sample for testing and the results of the duplicate analysis are compared to the 

initial result. The result should have a difference value of within 10% of the initial result (if the results 

of the original analysis are greater than the LOQ). 

 The addition of AD to the Sample ID represents an Alternate Dilution. The analyst prepares an 

additional aliquot at a different dilution factor (usually double the initial factor). This analysis helps 

confirm that no additional compound is present and coeluting or sharing absorbance with the analyte of 

interest, as they would have a different response/absorbance than the analyte of interest. 

 The Sample ID LCS represents a Laboratory Control Sample. Clean matrix, similar to the client sample 

matrix, prepared and analyzed by the laboratory using the same reagents, spiking standards and 

procedures used for the client samples. The LCS is used to assess the control of the laboratory’s 

analytical system. Whenever spikes are prepared for our client projects, two extra spikes are prepared. 

The extras (randomly chosen) are labeled with the associated project number and kept in-house at the 

appropriate temperature conditions. When the project samples are received for analysis, the LCSs are 

analyzed to confirm that the analyte could be recovered from the media, separate from the samples 

which were used on the project and which may have been affected by source matrix, sample collection 

and/or sample transport. 

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General Reporting Notes 

(continued) 

 Significant Figures: Where the reported value is much greater than unity (1.00) in the units expressed, 

the number is rounded to a whole number of units, rather than to 3 significant figures. For example, a 

value of 10,456.45 ug catch is rounded to 10,456 ug. There are five significant digits displayed, but no 

confidence should be placed on more than two significant digits. 

 Manual Integration: The data systems used for processing will flag manually integrated peaks with 

an “M”. There are several reasons a peak may be manually integrated. These reasons will be identified 

by the following two letter designations. The peak was not integrated by the software “NI”, the peak 

was integrated incorrectly by the software “II” or the wrong peak was integrated by the software 

“WP”. These codes will accompany the analyst’s manual integration stamp placed next to the 

compound name. 

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Sample Custody

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Sample 

Spectra

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Calibration 

Curve Spectra

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This Is The Last Page

Of This Report.

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