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C. Sedimentation Ponds <br /> There is one sedimentation pond at the mine, located between the portal bench area and the office <br /> facilities area, on the south side of the haul road. The pond treats runoff from the portal bench <br /> disturbed area, the upper segment of the haul road surface and cut slopes, and a small supply <br /> storage area. The pond is somewhat oversized(storage volume adequate to contain the sediment <br /> and runoff from multiple 10 year, 24 hour precipitation events below the level of the gated 8" <br /> primary discharge pipe). In addition to the primary discharge pipe, the pond has an open channel <br /> emergency spillway designed for the 25-year, 24-hour precipitation event. The sedimentation <br /> pond is discussed in Section 2.4.4 of the text,and designs are depicted on Figure 2.2-3. <br /> D. Surface and Ground Water Monitoring <br /> GROTP,1D WATER <br /> Information provided by the applicant with respect to ground water in the permit area can be found <br /> in 4.2.2 through 4.2.4 of Volume I of the permit application. The monitoring plan is described in <br /> Section 4.2.4,and monitoring parameters are specified in Table 4.2-15. <br /> As discussed in the Probable Hydrologic Consequences (PHC) section of this document, no <br /> significant effects to bedrock or alluvial ground water systems are anticipated for this operation. <br /> The applicant will conduct monitoring of ground water in a manner approved by the Division to <br /> verify the projections of the PHC. The ground water monitoring plan is as follows(4.05.13(1)): <br /> 1. Quarterly monitoring of alluvial wells GW-1 and GW-3 for static water <br /> level,pH,temperature, and specific conductance. <br /> 2. Water quality sampling of mine water discharges as required by CDPS <br /> permit. <br /> 3. Monitoring of all non-seep inflows into the mine to include source, <br /> quantity, duration and quality (pH, electrical conductance, and <br /> temperature). <br /> 4. Monitoring of quantities of water discharged from the mine, consumed <br /> in the mine, and imported for use in the mine. <br /> Results of the quarterly ground water monitoring are submitted to the Division immediately after <br /> data collection and analysis. Monitoring results and evaluation are submitted in an annual <br /> hydrologic report (AHR). The AHR will detail inflows, discharges and consumption of water <br /> within the mine and shall be structured around the normal "water year" (October 1 through <br /> September 30). The annual report will also include baseline water quality data in addition to the <br /> quarterly monitoring data to allow for comparison of baseline and"during mining"conditions. No <br /> specific due date for AHR submittal is specified in the permit application document, although the <br /> AHR has generally been submitted in January. The following stipulation is included to specify a <br /> due date for AHR submittal. <br /> STIPULATION NO.26 <br /> THE ANNUAL HYDROLOGIC REPORT (AHR) COVERING THE <br /> PREVIOUS WATER YEAR FOR THE MCCLANE CANYON MINE <br /> 15 <br />