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. CLEARWATER GROUP, INC <br /> Groundwater Morutonrig and 5arnphng Protocols <br /> Laboratory and field handlmF procedures may be monitored, Lf required by the client or regulators, by including <br /> quality control (QC) samples for analysis with the groundwater samples Examples of different types of QC samples <br /> are as follows <br /> • Trip blanks are pprepared at the analytical laboratory by laboratory personnel to check field handling <br /> procedures Trip blan s are transported to the project site in the same manner as the laboratory-supplied sample <br /> containers to be filled They are not opened,and are returned to the laboratory with the samples collected Tpn <br /> blanks are analyzed for purgable organic compounds p <br /> • Eq'-Upment blanks are prepared in the field to determine if decontamination of field samphnFi ei <br /> quipment has been <br /> effective The sampling equipment used to collect the groundwater samples is rinsed with distil ed water whack n <br /> is <br /> then decanted into laboratory-supplied.containers The equipment blanks are transported to the laboratory,and <br /> are analyzed for the same cherrucarconstituents 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 compounds in order to check the reproducibility of laboratory data They are typically <br /> only collected from one well per 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 r-heck 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 /> • <br /> CLEARWATERGROUP,roc 2 v 46-1 <br />