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Henderson Mine and Mill <br />Geochemical Evaluation and Sampling Plan <br />Analytical Method: The Synthetic Precipitation Leaching Procedure (SPLP, EPA <br /> SW-846 Method 1312) will be used where appropriate. The <br /> SPLP procedure is useful for determining whether a <br /> potentially contaminated material, left: in situ, will leach <br /> toxic substances when exposed to normal weathering. <br /> Certain non-metal parameters may be analyzed by other <br /> suitable methods. <br />Photographic: Photographs of each sampling location will be taken and <br /> preserved as part of the sampling event. <br />GIS: GIS data will be collected for each sampling location. <br />Mill <br />Frequency: One-time <br />Sampling Method: Aqueous Grab. A single dip grab sample will be collected <br /> directly into pre-cleaned laboratory bottles. <br />Sample Location: Sample will be taken from Location #3. The sampling <br /> location is specified in Attachments 2a. <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 III) 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 />Analytical Method: The appropriate 40 CFR 136 method Ifor each individual <br /> analyte will be used to determine contaminant potential. The <br /> SPLP procedure will not be used as the sample will have <br /> already naturally leached through the tailing impoundments <br />Version 1, May-2010 Page 3