### draft amendments to NMP Lab Report Terri Zick to: Christopher Lambesis 07/14/2010 09:53 AM Cc: Kathy Wilson, "woodgl@trimatrixlabs.com " , Todd Ramaly

From: Terri Zick <tzick@cticompanies.com > To: Christopher Lambesis/R5/USEPAMS@EPA
Cc: Kathy Wilson <kathywilson@owossographic.com >, "woodgl@trimatrixlabs.com "

<woodgl@trimatrixlabs.com >, Todd Ramaly/R5/USEPA/US@EPA

ChrisAttached is a draft of the revised qualifications statement proposed by Trimatrix along with draft language (below) intended to be placed in the lab report to further discuss the recoveries observed in the QA/QC process. Please take a look and comment as necessary. Trimatrix is targeting this afternoon to finalize the text provided you are in agreement with the content .

Thank you



### Terri Zick 313-300-7401 cell tzick@cticompanies.com

CTI and Associates, Inc. 

### 51331 W. Pontiac Trail, Wixom, Ml 48393 248.486.5100 Phone / 248.486.5050 Fax

From: Gary Wood [mailto:woodgl@trimatrixlabs.com] Sent: Wednesday, July 14, 2010 10:45 AM To: Terri Zick Cc: 'Kathy Wilson' Subject: RE: Summary of 07-08-10 Conference Call

Good Morning Terri,

I expect that we will be able to issue all revisions today. Regarding the qualifiers and explanations, due to reporting space, we are handling in 2 ways. We've updated our Statement of Data Qualifications page (see attached). I will also be inserting a narrative into the text of the SDG narrative pages. That text is as listed below. Please review with Chris first and let me know if this meets with his approval before we make the final modifications this afternoon.



### During the analysis of the samples for the tentative identification of n-methylpyrrolidone, the samples had very low to no recovery for the acid surrogate compounds that were spiked into them. In addition, all of the samples had failing internal standard recoveries for perylene-d12, and sample 1003151-04 and 1003151-06 had failing internal standard recoveries for

### chrysene-d12. The poor surrogate recoveries were the direct result of the

sample matrix, which caused degradation of the injection port and the analytical column. Further, the non-target analytes in the sample matrix had concentrations such that the response of the internal standards mentioned above were suppressed below their acceptance limits.

These surrogates and internal standards, however, were not associated with n-methylpyrrolidone, and as such do not have an impact on the data quality of the results. N-methylpyrrolidone is considered a basic analyte, so the low acid recoveries are not applicable. All of the base/neutral surrogate compounds had acceptable recoveries with one exception - sample 1003151-05 - which also had a low recovery for the base/neutral surrogate ortho-terphenyl. This sample has been qualified as estimated based on the low recovery. The internal standard associated with n-methylpyrrolidone is 1,4-dichlorobenzene-d4, which had acceptable recovery in all of the samples. Due to this, no additional qualification is necessary. However, the data user must be reminded that all of the sample results are to be considered as estimated due to the inexact nature of the TIC calculation, which assumes a 1:1 response of the analyte and its associated internal standard.



### Gary Wood Senior Project Chemist

Corporate / Laboratory 5560 Corporate Exchange Court SE Grand Rapids, Michigan 49512 woodgl@trimatrixlabs.com Main: 616.975.4500 Direct: 616.940.4206 Fax: 616.942.7463 www.trimatrixlabs.com

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