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r <br /> container storage facility, sample container preparation, the sample storage refrigerator, and <br /> the cleanliness of the glassware preparation. <br /> 4.t <br /> The laboratory will maintain a written QA/QC Standard Operating Procedure (SOP) <br /> document, which is available upon request. The SOP describes in-house procedures to <br /> ensure the quality of analytical activities. Where not otherwise specified for particular <br /> analytical methods, general internal quality control checks include the use of method blanks, <br /> surrogate spikes, matrix-spikes, and duplicates. <br /> �I <br /> �I <br /> L� <br /> 809-OOI.wkp/03-06-97/u/keydata/workplan B-9 <br /> TerraNext <br />