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� r . CLEARWATER GROUP,INC. Groundwater Morutonng and Samplimg Protocols Laboratory and field handIme procedures may be monitored,if regwted by the eluent or regWators,bundudsng quality control(QC)samples for analysts with the groundwater samples Examples of different types of C samples are as follows Trip blanks are pre ared 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 laboratory-supplied samppie containers to be filled They are not opened,and are returned to the laboratory with the samples collected I p blanks are analyzed for puugable orga uc compounds Equipment blanks are prepared in the field to deter=dne if decosntu xwatxon of field sampling egu fi nwnt has been effective The sampling equipment used to collect the groundwater samples is rinsed with dts water whish is then decanted into laboratory-sup lied contesters The equipment blanks are transported to the laboratory,and are analyzed for the same chemt�consh cents 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 Iaboratory data They are typically only collected from one well per sampling event The duplicate is assigned an idenftfscatson number that wall not assoaate it with the source well. Generally,trip blanks and field blanks check field handling and transpportation procedures Duplicates check laboratory procedures The configuration of QC samples is and by CGT depending on site conditions and regulatory requirements I r I I , ; I I I I t I EI ' I i CtfARW.%T�t MRQ int[ f I I h I i 1M5,d31dM8t131:) WdEO Y 1 86, 6T I Nilf I ' i I