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Permit C-81-071 1996 Annual Hydrology Report <br />• Middle Creek: Middle Creek downstream of Mine 1 is monitored for flow and water quality at <br />one location under the CYCC monitoring program. USGS Site 09243700, also known as site <br />700, is located on Middle Creek approximately one mile upstream of the confluence of Foidel <br />and Middle Creeks (see Figure 2). The USGS maintains a continuous recorder at site 700 and <br />provides data summaries to CYCC. During 1996, the Middle Creek surface water monitoring <br />site required monthly flow and field parameter measurements with quarterly water quality <br />sample collection. The monitoring requirements are further described to require 12 flow and <br />field parameter monitoring instances to occur between March and September along with 4 <br />water quality sampling events. All monitoring requirements were fulfilled at this site during <br />1996. <br />Table 23 provides a summary of the 1996 Water Year data collected at Middle Creek surface <br />flow site 700. Table 23a provides the period of record statistical summary of collected data at <br />the site. Table 23b provides a historical summary of flow rate data for the site. Figures 48 <br />through 50 provide graphical representations of water levels and field conductivity data <br />recorded at the site. Again, the typical flow pattern was exhibited at this site with the spring <br />runoff period accounting for the peak flow observed. Runoff magnitude was well above <br />average during 1996 based upon comparison with previous years data and peak flow estimates <br />were in some instances derived from the extreme high end of the rating curves developed for <br />the site. These values represent best estimates but are unsubstantiated with measured data. <br />The inverse relationship between flow and field conductivity was evident at this location. Most <br />monitored water quality parameters for surface water site 700 were observed to fall within <br />previously established ranges for the 1996 Water Year with the exception of a new maximum <br />nitrite value recorded during April. <br />• Fish Creek: Three surface flow monitoring sites on Fish Creek are utilized. Site 16 is located <br />upstream of the Mine 2 area; site 302 is located downstream of the Fish Creel Borehole mine <br />dewatering site; and site 1002 is located approximately 2 miles further downstream and is <br />monitored in conjunction with alluvial well 006-AW-2. One additional site, 307, is monitored for <br />water levels only in conjunction with alluvial well 006-AZ-3. Station 16 replaced Station 1001 <br />that was located upstream of where Fish Creek enters Twentymile Park. During 1996, the Fish <br />Creek surface water monitoring sites generally required monthly flow and field parameter <br />measurements with quarterly water quality sample collection. The monitoring requirements for <br />all sites except 302 are further described to require 12 flow and field parameter monitoring <br />instances to occur between March and September along with 4 water quality sampling events. <br />All monitoring requirements were fulfilled at these sites in 1996. Required monitoring at site <br />302 included monthly flow, field parameter, and water quality sampling during the irrigation <br />season June through September. Site visitation requirements were met at site 302. <br />Tables 24 through 27 provide summaries of the 1996 Water Year data collected at Fish Creek <br />surface flow sites. Tables 24a, 25a, and 27a provide period of record statistical summaries of <br />collected data at each site. Tables 24b, 25b, and 27b provide period of record flow rate <br />summaries for the associated sites. Table 26a provides the water level summary for site 307. <br />Figures 51 through 55 provide graphical representations of water levels and selected water <br />quality parameters recorded at each site. Again, typical flow patterns were exhibited at these <br />sites with spring runoff periods accounting for the peak flows observed. Runoff magnitudes <br />were well above average during 1996 based upon comparison with previous years data and <br />peak flow estimates were in some instances derived from the extreme high end of the rating <br />. curves developed for each site. These values represent best estimates but are unsubstantiated <br />L\DOCUMENTWHR\ECKMAN\EP96TE%T.DOC 03/Ye197 Page 7 <br />