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• SURFACE WATER MONITORING <br />Foidel Creek in the vicinity of Mine 3 is monitored for flow and water quality at USGS Site 09243900 also <br />known as Site 900. Site 900 is located on Foidel Creek approximately one-half mile upstream of the <br />conFluence of Foidel and Middle Creeks (see Figure 2). Middle Creek in the vicinity of Mine 3 is monitored <br />for flaw and water quality at two (2) locations. USCS Site 09243700, also known as Site 700, is located <br />on Middle Creek approximately one mile upstream of the confluence of Foidel and Middle Creeks; Site 29 <br />is located on Middle Creek approximately one mile downstream of the conFluence with Foidel Creek (see <br />Figure 2). <br />Flows - Streamflow measurements are gauged at the two USGS sites and at Site 29. Due to the size of the <br />streams at the established monitoring locations, flows are rated rather than measured using a more accurate <br />controlled section such as a Flume. The USGS maintains continuous recorders a[ Sites 700 and 900 and <br />provides data summaries to CYCC. Plots of historic maximum and mean flow measurements on Foidel <br />Creek at Site 900 are presented as Figures 15 and 16 in this report. The 1994 Water Year runoff <br />hydrograph for site 900 is presented as Figure l7. Plots of historic maximum and mean flow measurements <br />on Middle Creek at Site 700 are presented as Figures l8 and l9. The 1994 Water Year runoff hydrograph <br />(or site 700 is presented as Figure 20. Mean historic monthly Flows for Site 29 are presented as Figure 2l; <br />• Flow data for the 1994 Water Year as Figure 22. Selected flow rate data consisting of historical and 1994 <br />Water Year maximum and minimum recorded Flows, and 1994 irrigation season (June through September) <br />mean Flows for Sites 900,700, and 29 are presented on Table 16. No new maximum or minimum Flows <br />were established during the 1994 Water Year. Flow magnitudes in general were noted to be much lower <br />than those experienced during 1993. <br />1994 Water Year data far these sites shows typical seasonal variation with rapid rise and fall of flow rates <br />associated with spring runoff. Historically these three surface water sites often stopped flowing during the <br />fall and winter. Currently however, and since approximately 1985, Sites 900 and 29 have typically Flowed <br />year-round due to the discharge influences of other mines upstream of the gaging stations. During the 1994 <br />Water Year, the plumb-bob used to measure water levels at Site 29 was removed during August. The <br />instrument was repaired on September 26, 1994 after acquiring replacement parts for the installation, <br />however, correlation between the previous datum elevation and the current damn[ elevation was not <br />correctly established and therefore the measured flow data for September 1994 is not provided in this report. <br />As shown in Figures l5 through 22, spring runoff continues to comprise most of the annual flow. <br />Water Quality -Water quality monitoring data for the Mine 3 surface water monitoring stations is presented <br />on Tables 10, IOa. 12, 12a, 13, and 13a. Per the approved hydrology monitoring program, water quality <br />• samples were collected at all three surface water monitoring sites during the 1994 Water Year. Plots of <br />historic water quality data for Foidel and Middle Creek sites are presented as Figures 23 through 27 and <br />Figure 30. Total dissolved solids concentration data for the period of record at site 29 is presented as Figure <br />-5- <br />