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• Calibration standards and devices — traceable standards or devices to set <br /> instrument response so that sample analysis results represent the absolute <br /> concentration of the constituent. <br /> Field QA samples will be collected to assess sample handling procedures and conditions. <br /> Standard field quality control may include the use of the following, and will be collected <br /> and analyzed as outlined in EPA Manual SW 846. <br /> • Field blanks —reagent water samples are prepared at the sampling location by the <br /> same procedure used to collect field groundwater samples and analyzed with the <br /> groundwater samples to assess the impact of sampling techniques on data quality. <br /> Typically, one field blank per twenty groundwater samples collected will be <br /> analyzed per sampling event. <br /> • Field replicates — duplicate or triplicate samples are collected and analyzed to <br /> assess the reproducibility of the analytical data. One replicate groundwater <br /> sample per twenty samples collected will be analyzed per sampling event, unless <br /> otherwise specified. Triplicate samples will be collected only when specific <br /> conditions warrant and generally are sent to an alternate laboratory to confirm the <br /> accuracy of the routinely used laboratory. <br /> • Trip blanks — reagent water samples are prepared before field work, transported <br /> and stored with the samples and analyzed to assess the impact of sample transport <br /> and storage for data quality. In the event that any analyte is detected in the field <br /> blank, a trip blank will be included in the subsequent groundwater sampling <br /> • event. <br /> Data reliability will be evaluated by the certified laboratory and reported on a cover sheet <br /> attached to the laboratory data report. Analytical data resulting from the testing of field <br /> or trip blanks will be included in the laboratory's report. Results from matrix spike, <br /> surrogate, and method blank testing will be reported, along with a statement of whether <br /> the samples were analyzed within the appropriate holding time. <br /> Stratus will evaluate the laboratory's report on data reliability and note significant QC <br /> results that may make the data biased or unacceptable:. Data viability will be performed <br /> as outlined in EPA Manual SW 846. If biased or unacceptable data is noted, corrective <br /> actions (including re-sample/re-analyze, etc.) will be evaluated on a site-specific basis. <br /> • <br /> Page 5 <br />