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and additional water is added to the sample container After resealing the sample container if bubbles still are present inside the sample Lonta,ner is discarded and the procedure is repeated with a nLw Lontniner Laboratory and field handling procedures may be monitored if required by the client or regulators by including quality control (QC) samples for anal}sis with the groundwater samples Examples of ditferent types of QC samples are as follows • Trip blanks are prepared at the analytical laboratory by laboratory personnel to cheek field handling proceddres Trip blanks are transported to the project site in the same manner as the laboratory-supplied sample containers to be filled They are not opened and are returned to the laboratory with the samples t-ollected Trip blanks are analyzed for purgable organic compounds • Equipment blanks arc prepared in the field to determine if decontamination of field sampling equipment has bLen ettecti,ve The sampling equipment used to collect the groundwater samples is rinsed with distilled water «hick is then dLeanted 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 aralyzcd for the samL compounds in order to check the reproducibility of laboratory data They are typiL illy only col ected from one well per sampling e%ent The duplicate is assigned an identification number that will not associate, it with the source well Generally, t,ip blanks and field blanks check field handling and transportation procedures Duplicates cheek laboratory procedures fhe configuration of QC samples is determined by CGI depending on site conditions and regulatory requirements r I CLEARWATER GROUP,INC (GWS) 2 revised July 12 1999