Laserfiche WebLink
„ r <br /> and additional water is added to the sample container After resealing the sample container, if bubbles still are present <br /> inside, the sample container is discarded and the procedure is repeated with a new container <br /> Laboratory and field handling procedures may be monitored, if required by the client or regulators, by including quality <br /> control (QC) samples for analysis with the groundwater samples Examples of different types of QC samples are as follows <br /> • Trip blanks are prepared at the analytical laboratory by laboratory personnel to check field handling procedures Trip <br /> blanks are transported to the prosect site in the same manner as the laboratory-supplied sample containers to be filled <br /> They are not opened, and are returned to the laboratory with the samples collected Trip blanks are analyzed for <br /> 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 the groundwater samples is rinsed with distilled water which is then <br /> decanted into laboratory-supplied containers The equipment blanks are transported to the laboratory,and are analyzed <br /> 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 analyzed for <br /> the same compounds in order to check the reproducibility of laboratory data They are typically only collected from <br /> one well per sampling event The duplicate is assigned an identification number that will not associate it with the <br /> source well <br /> Generally, trip blanks and field blanks check field handling and transportation procedures Duplicates check laboratory <br /> procedures The configuration of QC samples is determined by CGl depending on site conditions and regulatory <br /> requirements <br /> �i <br /> r r <br /> r � I <br /> i <br /> , <br /> r i <br /> ' CLEARWATER GROUP,INC (GWS) I I 2 revised February 26,2001 + <br />