2023-10-03_REVISION - M1977344 (23)

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Red Creek Quarry Baseline Surface Water and Groundwater Sampling and Analysis Plan Section 3: Surface Water Monitoring 3-2 − Oxidation-reduction potential (ORP) − Dissolved oxygen (DO) − Turbidity • Collection of water samples for laboratory analysis (see Section 3.3.2 below for further detail) Water quality samples will be collected prior to any measurement activities in the creek to avoid channel bottom disturbances that could affect the water chemistry. SOPs for surface water quality sampling and stream flow measurement are provided in Appendix C (SOP-7 and SOP-8, respectively) and the general methodology is summarized below. 3.3.1 Field Methods A general site inspection will be performed upon arrival at the monitoring station and comments regarding site conditions will be recorded in the field sampling record. Field parameters will be measured in the field and recorded on the field sampling record. An example of the field sampling record for surface water is included in Appendix C (SOP-7). Water Quality Field Instrumentation. The field parameter instruments will be rented from an environmental equipment company. Rented equipment will be checked to verify it is cleaned and 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.