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December 23, l 999 <br />Page C-7 <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 of sample contamination and <br />' evaluate potential error introduced by sample collection, handling, and analysis. All QA/QC samples <br />are labeled with QA/QC identification numbers and sent to the laboratory with the other samples for <br />' analyses. <br />Rrnsale Samples <br />' Most wells are equipped with dedicated sampling equipment. An equipment rinsate sample <br />of sampling equipment is intended to check if documentation 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-ionized water through the decontaminated pump. The same parameters that aze 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 isassigned a QA/QC sample identification number, stored in <br />' an ice cooler, and shipped to the laboratory with other water samples. <br />Duolrca~e Samples <br />' Duplicate samples are samples collected to check for the natural sample variance and the <br />consistency of field 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 an iced cooler, <br />' and shipped to the laboratory with the other water samples. <br />~' <br />Agapito Associates, Inc. <br />