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San Luis TSF David Carino <br /> 2022 Annual Dam Safety Inspection Battle Mountain Resources,Inc. <br /> at least every 3 years unless a change in measured drainage flow rates warrants more frequent <br /> cleaning and inspection. <br /> Table 2 San Luis TSF Underdrain Flow Measurements: March 2021 - March 2022 <br /> Date Flow ( m) <br /> 3/31/2021 30.5 <br /> 4/29/2021 31.0 <br /> 5/27/2021 31.0 <br /> 6/30/2021 32.0 <br /> 7/29/2021 32.0 <br /> 8/31/2021 31.0 <br /> 9/30/2021 31.0 <br /> 11/30/2021 32.0 <br /> 12/30/2021 32.0 <br /> 1/31/2022 31.5 <br /> 2/28/2022 31.5 <br /> 3/31/2022 1 31.0 11 <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 continues to improve. <br /> This area and also the cross-berms and rock-lined down-drains should be monitored closely to <br /> make sure erosion does not progress to detrimental levels. <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. The <br /> condition is presently judged to be minor; however, erosion will progress in the absence of <br /> vegetation, and mitigation will likely be required in 2023. Mitigation will entail repair of eroded <br /> areas and reseeding all slopes, followed by installation of erosion control blankets and/or cutting <br /> in shallow swales along the slopes to reduce runoff flow path lengths. EA is available to assist <br /> BMRI with developing mitigation plans for these areas. <br /> Seepage Underdrain Collection System: Continue the jetting and video inspection program to <br /> ensure the drain pipes do not become clogged. Consider installing a concrete structure for <br /> collecting underdrain flows from the toe drains to facilitate maintenance in the toe drain area, <br /> improve conditions for monitoring and inspecting the drain system, and to prevent the attraction <br /> of animals to the area by pooling of leakage from the drain pipes. <br /> Choked Runoff Diversion Ditch Culvert: Clear toe runoff channel culvert immediately south <br /> of toe drain outfall pipe <br /> 3 Engineering Analytics,Inc. <br />