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.7,, <br />Mr. Jim Stover -2- May 9, 1996 <br />MINREC, Inc. <br />3. As previously mentioned, the same flow measurements are used for upper and <br />lower Hubbard Creek. This should be described in the report. Please provide <br />revised report pages. <br />4. Please provide the surveyed ground surface elevations for each piezometer. This <br />information can be added to the lower left corner of the depth to water graphs. <br />5. On page 3 of the AHR, flow measurement methodologies are described. Please <br />provide the equations used to calculate flow in the culvert at the entrance to the <br />property. Future AHRs should provide calculations in the report. <br />6. Although no NPDES sampling was conducted during 1995 due to zero discharge, <br />please include a brief discussion describing this as it is important to the overall <br />hydrologic analysis of the mine site. <br />Please provide responses to the above comments. If you have any questions or concerns please <br />contact me. <br />Sincerely, <br />M~~ <br />Michael P. Boulay <br />Environmental Protection Specialist <br /> <br />