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CLEARWATER GROUP,INC. <br />• Groundwater Monitoring and Sampling Protocols <br /> Laboratory <br /> control(Qc}samples EoPanalysis ew�th the be <br /> monitored, if re groundwater sampZese Examplesthe lient or of differenttyptessofQCmsamp samples <br /> are as follows p <br /> • Trip blanks areprepared at the analytical laboratory by laboratory personnel to check field handling <br /> procedures Trip bunks are transported to the project site in the same manner as the laboratory-sup�alied sample <br /> containers to be filled They are not opened,and are returned to the laboratory with the samples collected Tnp <br /> blanks are analyzed for purgable organic compounds <br /> Equipment blanks are prepared in the field to determine if decontaminahon of field samplm equipment has been <br /> effective The sampling equipment usd to collect the groundwater samples is raised with distilled water which is <br /> then decanted alto laboratory-supplied containers The equipment blanks are transported to the laboratory,and <br /> are analyzed for the same chemical constituents as the samples collected at the site <br /> a Duplicates are collected at the same time that the standard groundwater samples are being collected and are <br /> analyzed for the same compounds in order to check the reproducibility of laboratory data They are typically <br /> only collected from one well per sampling event The duplicate is assigned an identification number that will not <br /> associate it with the source well <br /> blanks Generally, <br /> acheck <br /> field <br /> dngg transportation <br /> procedures te <br /> laboratory procedures The configuration of QC samplsisdetermind y CGI depending n site conditions and <br /> regulatory requirements <br /> i <br /> • <br /> 2 v 96-1 <br /> CY-EARWA7'ERGROi.TP,INC <br />