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Henderson Mill <br />POC Issues <br />S Single Alluvial Aquifer Overlaying Low Permeability Bedrock <br />- Bedrock hydraulic conductivity range 10~ to 10-~ cm/sec. <br />• Ground Water Flow Off-Site Controlled By Bedrock <br />- Bedrock surtace. <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 />,~ <br />