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San Luis TSF David Carino <br /> 2023 Annual Dam Safety Inspection Battle Mountain Resources,Inc. <br /> Table 2 San Luis TSF Underdrain Flow Measurements: April 2022 -May 2023 <br /> Date Flow m <br /> 4/27/2022 32.0 <br /> 5/31/2022 32.0 <br /> 6/30/2022 32.0 <br /> 7/28/2022 33.0 <br /> 8/31/2022 32.5 <br /> 9/29/2022 33.0 <br /> 10/31/2022 32.5 <br /> 11/30/2022 32.0 <br /> 12/30/2022 32.0 <br /> 1/31/2023 31.5 <br /> 2/28/2023 31.5 <br /> 3/30/2023 31.5 <br /> 2022 INSPECTION FINDINGS <br /> The overall surficial conditions of the tailings dam at the time of the inspection were generally <br /> satisfactory, except for minor issues discussed in more detail below. <br /> Right Downstream Groin: Revegetation in this area following repairs has achieved full recovery <br /> and is in satisfactory condition. This area and also the cross-berms and rock-lined down-drains <br /> should be monitored periodically to make sure erosion does not recur. <br /> South Diversion Ditch Drop Structure: Disturbed areas adjacent to the drop structure that are <br /> not protected by riprap were seeded in 2019. However, vegetation establishment is poor to date <br /> due to extended drought conditions, and erosional rilling is progressing in these areas. Erosion on <br /> the right(north) side of the drop structure has progressed to the point where repairs and mitigation <br /> are required. Mitigation will entail repair of eroded areas, cutting in shallow swales along the <br /> slopes to reduce runoff flow path lengths, followed by reseeding the slopes and installation of <br /> erosion control blankets or the application of mulch. <br /> Seepage Underdrain Collection System: Continue the jetting and video inspection program to <br /> ensure the drain pipes do not become clogged. <br /> Choked Runoff Diversion Ditch Culvert: Clear toe runoff channel culvert immediately south <br /> of underdrain outfall pipe <br /> 3 Engineering Analytics,Inc. <br />