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64443 M L Johnson ESJWQC r1.doc
EPA method 619
Triazine Herbicides
Revised report: April 9, 2012
The report was revised to remove all detections for Sample ID: 545BSAAE-GR.
Analyst and reviewer error caused the incorrect reporting of several analytes that were
outside retention time windows and did not meet confirmation criteria.
Sample Preparation:
The water samples were extracted according to EPA method 619. All holding
times were met.
Sample Analysis Information:
The samples were analyzed for Triazine Herbicides according to EPA method 619
using a Hewlett Packard GC equipped with an NPD.
Quality Control/Assurance
Spike Recovery
A laboratory control spike (LCS) was used for quality assurance. All spike
recoveries met acceptance criteria.
Sample 545XCCART-GR,MS was designated by the client for MS/MSD
analysis. All MS/MSD acceptance criteria were met.
Method blanks
No target compound was detected at or above the reporting level.
Surrogates
Surrogate recoveries are summarized on the form 2 & 8. All surrogate
recoveries were within control limits.
Calibration
The initial and continuing calibrations were performed according to the
method. All calibration acceptance criteria were met.
Summary:
No problem was encountered. The data generated are acceptable.
Adminsitrative Record Page 25688
64443 M L Johnson ESJWQC r1.doc
EPA method 8141A
Organophosphorous Compounds
Revised report: April 9, 2012
The report was revised to remove all detections for Sample ID: 545BSAAE-GR.
Analyst and reviewer error caused the incorrect reporting of several analytes that were
outside retention time windows and did not meet confirmation criteria.
Sample Preparation:
The water samples were extracted according to EPA method 3510C. All holding
times were met.
Sample Analysis Information:
The samples were analyzed for Organophosphorous Pesticides according to EPA
method 8141A using a Hewlett Packard GC equipped with an NPD.
Quality Control/Assurance
Spike Recovery
A Laboratory control spike (LCS) was used for quality assurance.
Dimethoate recovered below the 68% lower control limit in the LCS at 55.6%.
All other spike recoveries met acceptance criteria.
Sample 545XCCART-GR,MS was designated by the client for MS/MSD
analysis. All MS/MSD acceptance criteria were met.
Method blanks
No target compound was detected at or above the reporting level.
Surrogates
Surrogate recoveries are summarized on the form 2 & 8. All surrogate
recoveries were within control limits.
Calibration
The initial and continuing calibrations were performed according to the
method. All calibration acceptance criteria were met.
Summary:
No other problem was encountered.
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