Field Blanks and Replicates Sample Clauses

Field Blanks and Replicates. Sample blanks will be collected to detect background or method contamination. Replicate samples will be collected to evaluate variability in analytical methods. Other QA/QC samples will be collected at sampling points suspected to have relatively higher levels of contamination to provide meaningful information for blank or duplicate sample evaluation. All QA/QC samples will be collected in the same type of container as the corresponding primary samples. All QA/QC samples will be assigned identification aliases on the sample bottle label and on the chain of custody sheet to avoid alerting laboratories that the sample is a blank or replicate sample. The true identity of the QA/QC samples will be recorded in the field sampling log. The collection schedule for QA/QC samples will be as follows: 1. one trip blank for each cooler of VOC samples 2. one field methods (equipment) blank each day by each field sampling crew, and replicate as specified by MPCA hydrogeologist. At sites where dedicated equipment is installed in all monitoring xxxxx this sample can be eliminated. For each type of QA/QC sample, containers will be prepared and submitted for the following analyses: 1. trip blank 2. field methods (equipment) blank: VOCs; and trace metals as specified by MPCA hydrogeologist 3. field ambient air blank: only if specified 4. replicates: all analytical parameters specified Methods that will be used for preparing field blank samples are described below. Trip blanks for VOCs will be filled and sealed by the analytical laboratory with laboratory-controlled, organic-free water. The 40 ml, purge and trap, blank sample vials will travel with the actual sample vials to and from the field in the cooler, to the well head, etc., so that the blanks are exposed to precisely the same conditions as the actual samples. The bottle blanks will not be opened until they are analyzed in the laboratory along with the actual VOC samples they have accompanied. Ambient air field blanks will be filled in the field. VOC vials will be filled with laboratory-controlled, organic-free water. Containers will be opened and placed or held as closely as practical to the point at which actual sample containers are opened and filled. The sample blank containers will be filled with the laboratory-supplied water by the same personnel and at approximately the same time as the primary samples are being collected. The sample blank water in each container will be exposed to the air on site for an amount o...
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Related to Field Blanks and Replicates

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