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other Grassy Creek site) have not exceeded 7.0 cfs since water year 1986. NPDES Sites 002 and 003 are also located within the Grassy Creek basin. On September 18, 1984, water from NPDES 002 began being used in the truck wash facility at the Seneca II Mine. Water from the truck wash is cycled through a settling pond and carried via ditch to Pond 003 (i.e., NPDES Site 003) where it receives additional treatment before being discharged to Grassy Creek. Operation of the truck wash has considerably increased the volume of water moving through Pond 003. Prior to constructing the truck wash, the average discharge at Site 003 was 0.041 cfs; after the truck wash facility came into use, the average flow (through water year 1991) was 0.317 cfs. Discharges at Site 2 have also increased due to the truck wash operation, since the average flows at Site 2 before and after the truck wash are 1.801 cfs and 1.988 cfs, respectively. . Since over ten years of mining activity occurred before hydrologic monitoring began at the Seneca II Mine, it is difficult to define changes in the Grassy Creek surface water system due to mining. However, it would seem that the average discharge in Grassy Creek, as measured at Site 2, has increased to some extent, especially after installing the truck wash facility. Fish Creek Drainage. collected at surface Creek, Cow Camp Creek, in Appendix 7-4A, ar. Appendix 7-4B. Instantaneous flow measurements are water monitoring sites located on Bond and Fish Creek. Flow data are contained i plots of flow data are contained in Like the Grassy Creek drainage, streamflows in the Fish Creek basin are seasonally variable with peak flows occurring in the spring in response to snowmelt runoff. A summary of mean, • minimum, and maximum flows measured at sites within the Fish Creek drainage can be found in Table 7-91. With the exception of NPDES Sites 004 and 008, zero flows have been recorded at all 7-317e Revised 02/05/97