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Mine Workings Sampling Procedure <br /> As the mine workings samples are taken from a large, stagnant water body, purging will not yield <br /> a more representative sample and is considered inappropriate for the Ellison Decline and Burro <br /> Vent locations. The water level will be taken with a depth meter and field parameters will be <br /> taken prior to taking a grab sample from the middle third of the water column, if feasible. <br /> Sample Handling and Shipping <br /> Samples will be collected in containers provided by the contracted analytical laboratory in <br /> accordance with laboratory instructions and proper chain of custody procedures. Samples may be <br /> filtered if sufficient sediment is encountered.A blank or duplicate sample will be added for <br /> quality assurance purposes. Samples will be kept refrigerated until they are shipped within 72 <br /> hours of collection. They will be shipped on ice to the analytical laboratory. <br /> Slick Rock Project Groundwater Sampling and Analysis Plan-2025 <br /> Slick Rock NOI Modification July 2025 <br /> Appendix C Page 29 of 35 <br />