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<br />Memo to Gregg Squire <br />-2- <br /> <br />April 14, 1989 <br />High sodium content appears to be a major problem in the coal aquifers. The <br />HI, QR, and KLM aquifers all produce water with very high Sodium Absorption <br />Ratio. The sandstone and alluvial aquifers all present low salinity hazard <br />(SAR< 8). High sodium content is also common in groundwater at the nearby <br />Empire mine, particularly in the coal aquifers and in the 6Jhite sandstones. <br />The alluvial wells (P1, P3, P5, P8, J1, and COY) produce water with sulfate <br />levels above the nonmandatory standard of 250 mg/1, with P1 and P3 showing <br />long-term increasing trends. Except for isolated high levels of dissolved <br />Iron, Aluminum, Manganese, and Radium-226, there appear to be no other water <br />quality problems at the mine. <br />Trapper had three NPDES exceedances in 1988, all during the high runoff <br />season. Point 001 (Johnson Gulch) had TSS readings of 120 mg/1 on March 1 and <br />82 mg/1 on March 22, while Point 006 (Buzzard Gulch) had a TSS of 276 mg/1 on <br />March 22. <br />5231E/scg <br /> <br />