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7. <br /> �LEA-RWXFER <br /> G R O LF 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 /> r 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 contaiiiers 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 --This 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 chemical parameters as those collected at the site.. <br /> Du licates - These are to be collected at,, the same time that the re uired <br /> P 9 <br /> samples are being collected. . They. areypically 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- blan s check field handling and <br /> transportation Procedures: . The duplicate samples generally checks the <br /> .. <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 /> CLEARWA=GROUP,INC. April 28, 1995 <br />