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December 23, 1999 Puge G7 <br />• C.3.7 Field Quality Assurance/Quality Control Procedures and Samples <br />The well sampling order should be determined prior to sampling and may be dependent on <br />expected levels of analytes in each well, if known. Quality assurance/quality control (QA/QC) <br />samples will be collected during groundwater sampling. <br />QA/QC samples are designed to help identify potential sources ofsantple contamination and <br />evaluate potential error introduced by sample collection, handling, and analysis. AlI QA/QC samples <br />are labeled with QA/QC identification numbers and sent to the laboratory with the other samples for <br />analyses. <br />Rinsate Samples <br />Most wells are equipped with dedicated sampling equipment. An equipment rinsate sample <br />of sampling equipment is intended to check ifdocumentation procedures have been effective. If all <br />wells have dedicated downhole pumps, then a rinsate sample will not be necessary. For the well <br />sampling operation, a rinsate sample will be collected from the decontaminated sampling equipment <br />(ifa bailer is used) before it is used to obtain the sample. De-ionized or distilled water will be rinsed <br />• over the decontaminated sampling equipment and transferred to the sample bottles. If a submersible <br />(but nondedicated) downhole pump is used, the rinsate sample may be collected by running distilled <br />or de-ionizedwaterthrough the decontaminatedpump. The same parameters that are being analyzed <br />in the groundwater samples will be analyzed in the rinsate samples. Similar sample handling <br />procedures will also be employed (e.g., the rinsate sample for metals analyses will be filtered prior <br />to preservation). The rinsate sample is assigned a QA/QC sample identification number, stored in <br />an ice cooler, and shipped to the laboratory with other water samples. <br />Duplicate Samples <br />Duplicate samples are samples collected to check for the natural sample variance and the <br />consistency of Held techniques and laboratory analysis. A duplicate sample will be collected at the <br />same time as the initial sample. During filtration of the sample collected for metals analysis, the <br />filtered sample is split between the original sample bottle and the duplicate sample bottle until both <br />bottles are full. For samples requiring general mineral or nitrate/nitrite, the sample collected from <br />the bailer is split between the original sample bottle and the duplicate sample bottle until both bottles <br />• are full. The duplicate groundwater samples will be handled in the same manner as the primary <br />samples. A duplicate sample is assigned a QA/QC identification number, stored in mi iced cooler, <br />and shipped to the laboratory with the other water samples. <br />Agapito Associates, hic. <br />