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Henderson , Mill <br /> POC Issues <br /> • Single Alluvial Aquifer Overlaying Low Permeability Bedrock <br /> — Bedrock hydraulic conductivity range 10-4 to 10-6 cm/sec. <br /> • Ground Water Flow Off-Site Controlled By Bedrock <br /> — Bedrock surface. <br /> » Seismic refraction surveys. <br /> » Monitoring well data. <br /> • Ultimate Tailing Dam Elevation 8,850 ft msl <br /> — Potato Gulch potential ground water pathway. <br /> • High Apparent Variability In Ground Water Quality <br /> • Continue Monitoring GW-7 <br /> — Once Annually. <br /> — Monitor Indicator Parameters (pH, Chloride, Sulfate, and Manganese). <br />