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Christy Woodward <br />July 31, 2008 <br />Page 4 <br />top surface at angles perpendicular to the development rock lavers. Figures 4 through F show <br />the planned locations of the sampling trenches. <br />The trenches are designed to excavate through the surficial laver of displaced rock on the <br />running surface of the facility and to expose the underlying development rock construction <br />lavers. A composite sample will then be collected from each trench, which is representative of <br />the layers exposed by the trench. Three trenches and three corresponding composite samples <br />are planned to be collected from each development rock area with the exception of the <br />Carnation Mine. The development rock areas at the Carnation Mine have been generally <br />reclaimed and vegetation is currently established in these areas. In lieu of sample collection, <br />visual observation of the development rock will be conducted to confirm that the material is <br />similar to the development rock encountered at the other Sunday Group mines. Accordingly, <br />the development rock data collected from the other Sunday Group mines will be used to <br />characterize the Carnation %line. <br />11 <br />SuAlciaf Layer Resulting from <br />Grading of Running Surface <br />` Planned Sampling Trench <br />Perpendicular to Layers • <br />of Development Rock <br />Current Area of Development <br />- Rock Placement <br />(Angle of Repose Slope) <br />YO, L,jk <br />/ ZD@d1n* Adit <br />`- Previous Layer of Development <br />Rode Placed at Angle of Repose <br />Figure hlagranlnlatle rcl,res Ntilt1:'11 ?1C,- iollinellt rock arcas ?houllng laltt'ritig produced hl/ <br />(acillt.y construction and orientation of planned snfnhling trenches. <br />Each development rock sample will be visually logged in-field for lithologv, alteration, <br />mineralization and grain size according the Unified Soil Classification Svstem (USCS). <br />Samples will be submitted for laboratorv analysis of ABA, total metals, MWMP, and a subset <br />of these samples will be analyzed for soil-water characteristic curves and other geotechnical <br />parameters. Soil-water characteristic analyses will be performed bv_ Daniel 13. Stevens and <br />Associates, Inc. located in Albuquerque, New Mexico. <br />The purpose of the MWMP analvses are to evaluate if the development rock may potentially <br />leach toxic materials when in contact with precipitation. Consistent with recommendations <br />provided by DRMS WRMS 200811), the leachate collected from the %1WNIP will N, anaIN yeti <br />i