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• Laboratory and field handling procedures may be monitored, if required by the client or regulators, by including quality <br /> control (QC) samples for analysis with the groundwater samples Examples of different types of QC samples are as follows <br /> Trip blanks are prepared at the analytical laboratory by laboratory personnel to check field handling procedures Trip <br /> blanks are transported to the project site in the same manner as the laboratory-supplied sample containers to be filled <br /> They are not opened, and are returned to the laboratory with the samples collected Trip blanks are analyzed for <br /> purgable organic compounds <br /> • Equipment blanks are prepared in the field to determine if decontamination of field sampling equipment has been <br /> effective The sampling equipment used to collect the groundwater samples is rinsed with distilled water which is then <br /> decanted into laboratory-supplied containers The equipment blanks are transported to the laboratory, and are analyzed <br /> for the same chemical constituents as the samples collected at the site <br /> Duplicates are collected at the same time that the standard groundwater samples are being collected and are analyzed for <br /> the same compounds in order to check the reproducibility of laboratory data They are typically only collected from <br /> one well per sampling event The duplicate is assigned an identification number that will not associate it with the <br /> source well <br /> Generally, trip blanks and field blanks check field handling and transportation procedures Duplicates check laboratory <br /> procedures The: configuration of QC samples is determined by CGI depending on site conditions and regulatory <br /> requirements <br /> i' <br /> CLEARWATER GROUP,INC (GWS) 2 <br /> revised November 2, 1998 <br />