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I CLEARWATER <br /> • G R O LT 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 -.This Is prepared in the field using distilled water. They are. o <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 /> rDuplicates. 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 /> wellper sampling event, and may be collected _from a. different .well each <br /> r time. <br /> r• 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- CGS, ' depending . on site conditions and" regulatory <br /> r �re uirements. <br /> A, <br /> April 28, 1995 <br /> CLEARWATER GROUP,INC. 5 <br /> r . <br />