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' Section 10 <br /> ONSUE Environmental Laboratones Inc Revision 0 <br /> Quality Assurance Plan February 15, 1496 <br /> ' Page 1 of 6 <br /> ' 100 ANALYSIS OF QUALITY CONTROL SArLPLES AND DOCUyEF-NTATION <br /> ONSITE follows the Quality Conrrol (QC) requirements for the EPA Analytical Level <br /> ' requested The reports generated by ONSITE may not necessarily contain all QC results, but <br /> all required QC measurements are performed, results are checked and approved prior to the <br /> report being issued Control charts are maintained of QC measurements for the evaluation of <br /> ' trends and method performance <br /> QC measurement raw data are maintained and kept within the analytical run file <br /> ' 101 Use of Control Samples and Reference Materials <br /> 101 1 Blanks <br /> Blanks are used to check laboratory contamination All calibrations include a <br /> ' reagent blank and all daily, digestion, or extraction batches are required to <br /> include a method blank <br /> 10 1 1 1 Method blanks and reagent blanks are <br /> analyzed with each matnx and each analytical, digestion, or extraction <br /> batch An aliquot, equal in volume or weight to the sample, of j <br /> laboratory reagent grade deionized water or a non-contaminated soil is <br /> ' used for method blank analyses The method blank, like that of <br /> duplicate and spike samples is taken through the whole analytical <br /> ' process <br /> 101 1 2 Transport blanks, also known as trip <br /> ' blanks, are routinely analyzed while determitung volatile organic <br /> compounds (VOA) in water Whenever VOA containers are sent into <br /> the field for water sampling, they are always accompanied by a sample <br /> of "purgeable organic free water" which is returned to the laboratory <br /> and analyzed with the samples This gives an indication of the <br /> possibility of contamination of samples from outside sources Upon <br /> request, transport blanks may be provided for any other parameter, <br /> ' although the likelihood of outside contamination is less likely <br /> 10 1 2 Laboratory Control Standards (LCS) <br /> ' An LCS is derived from a second different source than the calibration <br /> standards and is used to check the accuracy of the calibration under the <br /> optimum conditions excluding any chemical interference from sample matrix <br /> These standards must be derived from vendor, EPA, NIST, or A21-A certified <br /> Word 6 0 loelscc10 doc <br />