EP 1110-1-31
31 Aug 01
2.3.4.1
Field Dust Wipe Quality Assurance Verification
Prior to beginning field dust sampling, the Contractor shall provide the laboratory with at least
one uncontaminated wipe per each container of bulk packed wipes that will be used for
collecting field dust wipes, to verify that the wipe material meets the requirements of Standard
Specification for Wipe Sampling Materials for Lead in Surface Dust (E 1792). Wipes containing
more than 5.0 g/wipe of background lead shall render the entire container of bulk packed wipes
represented by the analyzed wipe, contaminated and disqualify the represented wipes for field
use. (See AIHA web site for a listing of wipe vendors meeting ASTM Method E 1792 criteria.)
2.3.4.2
Laboratory QA and QC Verification.
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NOTE: The Contractor must choose the most advantageous technique to provide extra
samples to the laboratory, should additional samples be required by the laboratory to
replace sampling or QA/QC data lost due to laboratory mistakes. The Gover nment is not
liable for cost of additional sample collection due to laboratory mistakes, Contractor
sample collection problems, or chain-of-custody errors.
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a. Evaluation of Laboratory Data
The Contractor shall obtain and review NLLAP -required QC data generated for each sample run
completed under this SOW. The QC data shall include batch QC validation data and the 95%
confidence interval data (determined by the laboratory from QC charts or a QC database for each
matrix, i.e., single surface dust wipe samples, deteriorated paint chip samples, soil samples)
determined at concentrations equivalent to 40 g/ft2 for dust wipe samples, 0.5% by weight
(5000 g/g (ppm)) for paint chip samples, and [insert applicable criteria from Table A-1] g/g
(ppm)) for bulk soil samples. The Contractor shall evaluate the data package to determine that
the QA/QC data generated for each sample run falls within current NLLAP Laboratory Quality
System Requirements (LQSR) parameters listed in Table B-3 (Appendix B). Spiked samples
submitted to the laboratory in accordance with this SOW shall fall within 75% - 125% of the true
value.
b. Rejection of Laboratory Data
The Contractor shall not accept or use data from the laboratory that does not fall within current
NLLAP LQSR parameters specified in Table B-3. If the laboratory fails to obtain spiked results
within the specified error limits:
Two more spikes of the same matrix shall be sent immediately to the laboratory for
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