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Red Creek Quarry Baseline <br />Surface Water and Groundwater Sampling and Analysis Pl an Section 3: Surface Water Monitoring 3-3 calibrated. If field equipment is used over multiple days, the equipment will be recalibrated at the beginning of each day according to the manufacturer’s specifications using the water quality equipment calibration form located in Appendix C (SOP-2). A drift check will be performed if there are indications that the equipment is not performing normally or is subjected to adverse conditions (e.g., extreme cold); recalibration will be performed for parameter readings that are outside of acceptable performance limits. 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. Surface Water Sample Collection. Water quality samples will be collected using the preferred direct grab method or other sampling method protocols detailed in SOP-7 (Appendix C). Samples from a flowing stream will be collected using dedicated sampling containers included with each sampling kit supplied by the laboratory, unless the sample bottle contains no preservative, in which case the sample may be collected directly into the sample bottle. Surface water samples will be collected by submerging the dedicated collection container or unpreserved sample bottle in the stream at a point where fresh water is continuously flowing to ensure a representative sample. Only certified clean bottles that are obtained from the analytical laboratory will be used to store and ship samples to the laboratory. Samples for dissolved constituent analysis will be filtered (0.45 micrometer [µm]) prior to collection in the laboratory-supplied preserved (as appropriate) sample container. All sample containers will be clearly labeled with the station ID, date and time of sample collection, filtered or unfiltered condition, preservatives, and the sampler’s initials. Samples will be kept cool in an insulated cooler from the time of collection to receipt by the analytical laboratory as detailed in the QAPP (Appendix B). Chain-of-custody (COC) forms and custody seals provided by the laboratory will be used for all samples shipped to the laboratory. Sample containers, preservatives, laboratory holding times, analytical methods, and method detection limits for surface water samples are summarized in the QAPP (Appendix B). Surface water samples will also be collected for quality assurance/quality control (QA/QC) purposes as outlined in the QAPP (Appendix B). For each sampling round, surface water blind duplicate samples will be collected at a frequency of 1 per sampling event. Stream Flow Measurements. Stream flow rates will be measured at the established location (Figure 1) using a flume installed in Red Creek. The SOP for flow measurement is described in SOP-8 (Appendix B). 3.3.2 Laboratory Analysis Surface water samples will be analyzed for the same broad range of constituents to establish baseline conditions and perform direct comparisons to groundwater data. The analyte list includes regulated surface and groundwater constituents and cation/anion data to compare water sources. The constituents to be analyzed during surface water sampling events under this plan are provided in Appendix A. Appendix A also provides the analytical methods, analytical limits, and water quality standards for reference. Additional details, including holding times, container types, and preservatives, are provided in the QAPP (Appendix B) and SOPs 4 and 7 (Appendix C).