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Quality Assurance Project Plan <br />Red Creek Quarry Monitoring Program Section 5: Data Generation and Acquisition <br /> <br /> <br />5-2 <br /> <br />and analyses requested. If shipment is needed, the samples will be packaged with custody seals and <br />shipped in accordance with United States Department of Transportation standards. <br />The original COC form will be given to the laboratory with the samples, and the monitoring contractor <br />will retain a copy in the project files. Once received by the laboratory, a sample receipt and storage <br />record will be generated. <br />5.3 Analytical Methods <br />Samples for groundwater quality analysis will be collected and submitted to a certified laboratory. <br />Sample containers, labels, and preservatives will be obtained from the analytical laboratory, <br />laboratory supplier, or laboratory equipment provider. Samples must be preserved and analyzed <br />within the holding times. The laboratory will be notified by the PM prior to sample shipment so that <br />the holding time is not exceeded. Sample collection and preparation instructions provided by the <br />analytical laboratory will be followed throughout the duration of each project. <br />Field measurements will be conducted using portable meters and field test kits that employ USEPA- <br />approved methods. Field measurements in surface water will include measurement of temperature, <br />pH, SC, oxidation-reduction potential (ORP), DO, and turbidity. Field measurements in groundwater <br />will include depth-to-water, temperature, pH, DO, ORP, SC, and turbidity. Measurements will follow <br />procedures recommended by the manufacturer of the meter or test kit and procedures discussed in <br />the groundwater sampling SOP. Results of field measurements will be recorded in bound field <br />logbooks or on field data sheets. <br />The required analytical QC procedures are outlined in Section 5.4.2. The QAO will be responsible for <br />ensuring that laboratory QC is performed in accordance with the specified method and the <br />procedures contained in this QAPP. <br />5.4 Quality Control <br />QC is a means of measuring or estimating the potential variability involved with sample collection, <br />analysis, or measurement activities, both in the field and in the laboratory. <br />5.4.1 Field QC Checks <br />QC for field measurements will be assessed using the following methods: <br />• Field instruments will be inspected, maintained, and calibrated prior to each sampling event. <br />• If a drift check indicates that the instrument is outside of acceptable performance limits, field <br />staff will qualify the field data collected prior to the drift check. <br />• Results of the QC tests will be recorded on a field data sheet. <br />Field QC samples sent to the laboratory will include duplicates and blanks that will be submitted <br />blind (not identified with the parent sample) for analysis. Field duplicates will be collected at a <br />frequency of at least one per sampling event. Equipment blanks will be collected at a frequency of <br />once per sampling event for each time equipment that requires decontamination is used. <br />Submission of QC samples will be scheduled so that field QC sample frequency is met for each <br />medium-specific sampling event. Other field blanks may be specified by the PM on an as-needed <br />basis. <br />5.4.1.1 Duplicates <br />Duplicate samples are two samples collected from the same location, representing the same <br />sampling event, and carried through assessment and analytical procedures in an identical manner.