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kJ <br /> CLEARWATER GROUP,INC. <br /> Groundwater Monitoring and Sampling Protocols <br /> Laboratory and field handling procedures may be monitored, if required by the client or.regulators, by including <br /> quality control(QC)samples for analysis with the groundwater samples. Examples of different types of OC 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 laboratory-supplied sample <br /> containers to be filled. They are not opened,and are returned to the laboratory with the samples collected. Trip <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 thegroundwater 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 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 check field handling 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 /> l <br /> a <br /> CLEARWATER GROUP,INC. 2 v.96-1 <br />