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SOP—SG-1 <br />SOIL GAS WELL SAMPLING <br />STANDARD OPERATING PROCEDURE <br />2.6 QUALITY CONTROL <br />VVESr <br />i immmW serYiceE & rnfiwlogy <br />Analytical data will be subject to quality control review and validation by both the laboratory and <br />prior to completion of the report by WEST. A data quality usability evaluation will be conducted <br />and will incorporate the following: (1) review of laboratory reports; (2) documentation of <br />geographic location of samples and sampling procedures; (3) whether data are representative of <br />Site conditions; (4) appropriateness of laboratory analytical methods and detection limits; and (5) <br />laboratory surrogate recovery, method blank data, precision and accuracy. <br />The laboratory quality assurance will included a review of method blanks, matrix spike recovery; <br />matrix spike duplicates; and sample hold times. Field sampling and transportation procedures <br />will also be reviewed for: sample collection methodology; sample containers; sample storage; <br />and sample duplicates. <br />on <br />