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1 <br /> CLEARWA' TER <br /> C R O U P I N C <br /> Laboratory and field handling procedures can be monitored by including <br /> quality control (QC) samples for analysis with the other samples collected <br /> Examples of different types of QC samples are as follows <br />' • Trip blank - This is used for purgable organic compounds only They are <br /> prepared at the analytical laboratory by laboratory personnel Trip blanks <br /> travel to the project site with the sample containers to be filled They are <br />' not opened, and are returned to the laboratory with the samples collected <br /> at the site for analysis. <br />' * Field blank _ T us is prepared in the field using distilled water. They are to <br /> accompany the samples collected at the site to the laboratory, to be <br /> analyzed for the same chenucal parameters as those collected at the site <br />' • Duplicates - These are to be collected at the same time that the required <br /> samples are being collected They are typically only collected from one <br />' well per sampling event, and may be collected from a different well each <br /> time. <br /> Generally, trip blanks and field blanks check field handling and <br /> transportation procedures The duplicate samples generally checks the <br /> laboratory procedures. The number and types of QC samples will be <br />' determined by CGI, depending on site conditions and regulatory <br /> requirements <br /> I <br /> 1 <br /> CLEARWATER GROUP,INC 5 December 16, 1994 <br />