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Ltr/Revw Bsln Env Data - 4 - July 2, 1986 (I). Page 35 of the report states that flow from the springs inventoried varied from less than 0.02 gallons per minute to 2.5 gallons per minute. Table 2.04.7-14A, however, indicates that at least 12 springs were discharging more than 3 gallons per minute during periods of base flow (November, 1984). The applicant should clarify this discrepancy. (J ). To adequately characterize the hydrologic regime at and near the proposed mine site, the applicant should sample springs which flowed more than 3.5 gallons/minute in November, 1984 (as identified in Table 2.04.7-14A) for the parameters listed in "Appendix B 1984 Ground Water Quality Data". Discharge measurements should be made at the time of water quality sampling. The water quality sampling and discharge measurements should occur during periods of base-flow (late September through October). 3. Surface Water Information 2.04.7(2) (A). A surface water monitoring program was defined and conducted during 1984 to provide for deficiencies not addressed in the original application. Three elements comprised the program: 1. monthly field sampling; 2. water quality sampling; and, 3, flood flow monitoring. Stations were selected on the affected drainages within the permit area. Each of these three components of the program are addressed individually. Field S~am~ling. Monitoring of flow, temperature, pH and con uc~vity was performed between March and November of 1984. Although one year of monitoring was planned, only nine (9) months of data were collected. Precipitation data in Table 2.04.7-5A indicate that a considerable amount of annual precipitation occurs during the winter. It is uncertain whether individual snowmelt runoff events in the winter contribute significant amounts to annual streamflow at the elevation of the mine site. In order to describe seasonal variations as defined in 2.04.7(2), additional monitoring during the missing period of record is required. ii. Water Quality Sampling. Three seasonal flow conditions were ide~fre or samp ing constituent concentrations. The data submitted are adequate for these purposes. However, very limited interpretation of the data is provided. The application needs to discuss the significance of the water quality data collected. In particular, the following three items need to be discussed in the narrative: The source for the relatively high concentrations of iron and boron in baseline data should be identified if possible; Relationships between concentration and flow or season should be discussed; and,