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• 4.0 SURFACE WATER <br />Trapper Nine monitored two stream sites and eleven NPDES <br />discharge sites during 1987. The stream sites included S1; Flume ~ <br />Gulch and S3; Pyeatt Gulch. NPDES sites 001 through 010 and the <br />lOYR/24HR (Coyote) site were also monitored for discharge. The sites <br />were visited weekly throughout the mine year. Plots of flow versus <br />day of year relative to January 1, 1987 are presented for those sites <br />monitored by continuous recorders including sites S1, S3, NPDES 001 <br />and 002, and Coyote. Map No. 2-3 also shows the location of the <br />surface-water sites where data was collected in 1987. NPDES sites <br />003, 004, 007, 009 and 010 had no discharge and no data is presented <br />for them. <br />4.1 SURFACE-WATER FLOW <br />• Flow from Flume Gulch site S1 had an observed maximum of 317 gpm <br />during the period November 1986 to December 1987. Data was not <br />collected during the Winter months of December of 1986 and January, <br />February and March of 1987. It is likely that a larger flow occurred <br />in March of 1987. Flow averaged 32.6 gpm through the period. Figure <br />C-1 presents the flow versus days (relative tc January 1, 1987) for <br />Flume Gulch site S1. The flow versus days plot for Pyeatt Gulch site <br />S3 is presented in Figure C-2. Flow peaks shown by the squares <br />reached a maximum of 1427 gpm. Flow averaged 111.3 gpm throughout the <br />period. Minimum flows, as shown on Figure C-2, dominated the period <br />and a flow slightly less than 100 gpm was very representative of the <br />minimum daily flow in Pyeatt at site ~3. <br />• Figure C-3 presents the flow versus days for NPDES site 001 <br />(Johnson Gulch). All sites operated without incident throughout the <br />4-1 <br />