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