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1 y M CLEARWATER GROUP,INC Groundwater Monitoring and Sampling Protocols ' Laboratory and field handling procedures may be monitored, if required by the client or regulators,by including quality control(QC)samples for analysis with the groundwater samples Examples of different types of QC samples are as follows • Trip blanks are prepared at the analytical laboratory by laboratory personnel to check field handling procedures Trip blanks are transported to the project site in the same manner as the laboxatolsupphed sample containers to be filled They are not opened,and are returned to the laboratory with the samples collected Trip blanks are analyzed for purgable organic compounds • Equipment blanks are prepared in the held to determine if decontamination of field sampling equipment has been effective The sampling equipment used to collect the groundwater samples is rinsed with distilled water which is then decanted into laboratory-supplied containers The equipment blanks are transported to the laboratory,and are analyzed for the same chemical constituents as the samples collected at the site • Duplicates are collected at the same time that the standard groundwater samples are being collected and are analyzed for the same compounds in order to check the reproducibility of laboratory data They are typically only collected from one well per sampling event The duplicate is assigned an identification number that will not associate it with the source well Generally, trip blanks and field blanks check field handling and transportation procedures Duplicates check laboratory procedures The configuration of QC samples is determined by CGI depending on site conditions and regulatory requirements s I I I. li CLEARWATERGROUP,INC j � ,� � � �,I II� �� {� 21 I� � � �M�ESI �� li � I I � � � � � �� V�b 1f I � s' I J h �