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Henderson Mine and Mill. <br />Geochemical Evaluation and Sampling Plan <br />• Attachment 2a - Identifies the single sampling location at the Mill (Location #3), <br />which is located near the tailing pump station, at the confluence of the 1 and 3 <br />dam seep return canals and flows from the tailing area wellfield. Samples taken <br />from this location will provide good representation of leached materials being <br />transported from the tailing impoundments to ground and surface water systems. <br />Sampling Plan <br />Mine <br />Frequency: One-time <br />Sampling Method: Composite Soil Grab. The sampling areas will be gridded <br /> into nine equally spaced locations. Soil samples of <br /> equivalent volume will be collected from each of the nine <br /> locations to a depth of 1-foot, at each of the two sampling <br /> locations. The nine samples (at each location) will be <br /> composited together to form a single homogenous sample to <br /> provide a representative sample of the area being evaluated. <br />Sample Location: Samples will be taken from two locations: Location #1 and <br /> Location #2. These sampling locations are specified in <br /> Attachments la and lb. <br />Sampling QC: As a standard quality control practice., all sample containers <br /> and sampling equipment will be thoroughly cleaned and <br /> rinsed in accordance with 40 CFR, Part 403, Appendix E. <br /> This precludes the use of any equipment that may contain <br /> trace amounts of pollutant. Each sample is labeled prior to, <br /> or at the time of, sampling on a self-adhesive label with <br /> waterproof ink. As a minimum, the sample number, name of <br /> collector, date and time of collection, and sample <br /> preservative are included on the label., <br />Parameters to be Parameters specified in Regulation 41 (Tables 1 through 4) <br />Tested: and Regulation 31 (Tables I through 111) that could <br /> potentially exist at the Mine. A list of these parameters to be <br /> tested is provided in Attachment 3. A list of parameters from <br /> these regulatory sections that are deemed to be inapplicable, <br /> and thus won't be analyzed is also included. <br />Version 1, May-2010 Page 2