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. CLEARWATER GROUP,INC. <br /> Groundwater Morutoring and Sampling Protocols <br /> r <br /> Laboratory and field handlirn procedures may be monitored, if required by the client or regulators,b including <br /> quality control (QC) samples for analysis with the groundwater samples Examples of different types of 6C samples <br /> are as follows <br /> • Trip blanks are prepared at the analytical laboratory by laboratory personnel to check field handling <br /> procedures Trip blanks are transported to the project site in the same manner as the Iaboratory-supplied sample <br /> containers to be filled They are not opened,and are returned to the laboratory with the samples collected Tpnp <br /> blanks are analyzed for 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 <br /> then decanted into 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 /> • Duplicates are collected at the same time that the standard groundwater samples are being collected and are <br /> analyzed for the same com ounds in order to check the reproducibility of laboratory data They are typically <br /> only collected from one welFper sampling event The duplicate is assigned an identification number that will not <br /> associate it with the source well <br /> Generally, trip blanks and field blanks check field handlingg and transportation procedures Duplicates check <br /> laboratory procedures The configuration of QC samples is determined by CGI depending on site conditions and <br /> regulatory requirements <br /> CrEAxwATER GROUP,INC 2 v 96-1 <br />