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' 1. The Hydrology I'.=- has been revised to show the locations of intermittence seeps at the Grassy Gap Coal Mine. No springs exist on the permit area. 2. The effect of mining on the quality of Grassy Creek is discussed in the section on hydrologic balance (No. VI below). ' 3. A surface water monitoring program was initiated on April 19, 1980. This program has been in operation since that date. Ten surface sites were located to be monitored. Field data collected at flowing sites ' are temperature, pH, conductivity, and oxygen content. One site (Site 4) was selected for a weir installation and flow rates are noted monthly. Sites 1, 2, and 4 flow with the greatest regularity. The other sites dry up quickly after spring runoff. Field data collected since June, 1981 is enclosed on the attached sheets. The last sample taken for chemical analysis was from Site 4 on March 29, 1982. The chemical analysis of ' that sample is enclosed as Table 1. Table 2 is a tabulation of flows at Site 4 since June, 1981. ' Based on data collected to-date, there has been little, if any, downgrading of surface water quality since mining operations began. Field conductance and pH show seasonal fluctuations, but no overall trend. Data on suspended solids is a little short. A revision of the surface water monitoring pro- ' fram seems in order. It is proposed to drop monitoring itt it d of highly inter- m ent s es an concentrate on two sites: 1 & 4. This plan would increase Grassy Creek water analyses data at the points of nearly continual flow ' and at the point leaving the mined area. More data woul d be collected during the runoff months. The proposed surface water monitoring program is as foll ows: Monthly* Quarterly* Sample (Analysis E) Site 1, Site 4 Site 1, Site 4 Also field pH, temperature, ' conductivity, visual Oil & Grease Site 1, Site 4 Site 1, Site 4 ' Flow measurement Site 4 Site 4 *Monthly (months of April, May & June) *Quarterly (months of February, August & November) Three alluvial wells (MW-1, MW-2, and MW-3) have been monitored monthly since August, 1980. The monthly monitoring program consists of recording ' the water level, pH, temperature and conductivity. Data collected since June, 1981 is attached.