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