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1 1 1 1 1 1 1 1 1 1 Draft: Apri[ 5, 1999 Page C-7 C.3.7 Field Quality Assurance/Quality Control Procedures and Samples The well sampling order should be determined prior to sampling and may be dependent on expected levels of analytes in each well, if known. Quality assurance/quality control (QA/QC) samples will be collected during groundwater sampling. QA/QC samples are designed to help identify potential sources ofsample contamination and evaluate potential error introduced by sample collection, handling, and analysis. All QA/QC samples aze labeled with QA/QC identification numbers and sent to the laboratory with the other samples for analyses. Rinsate Samples An equipment rinsate sample of sampling equipment is intended to check if documentation procedures have been effective. If all wells have dedicated downhole pumps, then a rinsate sample will not be necessary. For the well sampling operation, a rinsate sample will be collected from the decontaminated sampling equipment (if a bailer is used) before it is used to obtain the sample. De- ionized ordistilled waterwill berinsed overthedecontaminated sampling equipment and transferred to the sample bottles. If a submersible (but nondedicated) downhole pump is used, the rinsate sample may be collected by running distilled or de-ionized water through the decontaminated pump. The same parameters that aze being analyzed in the groundwater samples will be analyzed in the rinsate samples. Similaz sample handling procedures will also be employed (e.g., the rinsate sample for metals analyses will be filtered prior to preservation). The rinsate sample is assigned a QA/QC sample identification number, stored in an ice cooler, and shipped to the laboratory with other water samples. Duplicate Samples Duplicate samples are samples collected to check for the natural sample variance and the consistency of field techniques and laboratory analysis. A duplicate sample will be collected at the same time as the initial sample. During filtration of the sample collected for metals analysis, the filtered sample is split between the original sample bottle and the duplicate sample bottle until both bottles are full. For samples requiring general mineral or nitrate/nitrite, the sample collected from the bailer is split between the original sample bottle and the duplicate sample bottle until both bottles are full. The duplicate groundwater samples will be handled in the same manner as the primary samples. A duplicate sample is assigned a QA/QC identification number, stored in an iced cooler, and shipped to the laboratory with the other water samples. Agapito Associates, Inc.