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' All equipment will be thoroughly decontaminated between each well,using the procedures previously ' purging d=nbed at the beginning of this section- Dunn sample collection for volatile organic analysis, the amount of air passing through the sample is • mmwuzed. This helps prevent the air from stopping the`volatiles from the water Sample bottles are filled by slowly runnning the sample down the side of the bottle until there is a convex meniscus over the month of the bottle The hd Is carefully screwed onto the bottle such that no air bubbles are present wrthtn the bottle If a bubble is present, the cap is removed and additional water is added to the sample container After resealing the sample container,sf bubbles still are present inside,the sample container is discarded and the procedure is ' repeated with a new container procedures shay be momtowd, if required by the client or regulators,by mcluding Laboratory and field handling p ter samples Examples of different types of QC qua]* control (QC) samples for analysts with the � ' samples are as follows • Trip blanks are prelvnd at the analytical laboratory by laboratory personnel to check field handling Procedures Trip blanks are transported to the project site lin the same manner as the laboratory-supplied ' and are returned to the laboratory with the samples sasaple containers to be filled. They are root opened. colleda Trip blacks are analyzed for purgeable organic cotnpOands in the the field to determine h€decontamination of field sampling equrPt has • Equipment blasilcs are prepared distilled water been efffedtve The sampling equipment used to colied the groundwater swent blanks are noopier is rinsed with ithtra &orted to the which is then decanted into laboratory-supplred red Th►eP les collected at the site laboratory,and are analyzed for the same chemical constttuegts as the same • Duplicates are collected at the same time that the standard groundwater samples are being colleded and are analyzed for the same compounds in order to check the reproducibility of laboratory data. They are typically �i only collected from one well per sampling pct- The duplicate is assigned an identification number that will not associate it with the source tM11 rtatian Procedures Duplicates check I Generally, trip blanks and field blanks check field hge Clearwater depenchng on site conditions laboratory procedures The configuration of QC samples and regulatory requirements I I CLSgRWATER GROUP(GWS) 2 revised Apnl 4,2042