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Schwartzwalder Mine -Hydrologic F-.valuation of Mine Closure and Reclamation 13 <br />Table 5. Stream Gaging Stations on Ralston Creek <br />tiW'-LLf)G <br />84 608.97 E3~lo~~ Property Line (nt <br />19 6533.43 Guctrii tihack (rn <br />6563.94 Parking Lot (near <br />SW'-A001 733673.75 2061 141.35 6590.57 Above Discharge (upstream of culvert) <br />SW-l1C -- 73~3?8.15 ?060300.99_ 6618.08 Upper Culvert (upstream of culvert) <br />SW-UP ( 735102.33 2091 X3.21 ~ 6(160.82 ~Op~~radient (-1,200' E of prep. f3rnutdary) <br />Nnte Crwrdinatrs given ur time Plane fief. NAI) 27 <br />Staff gages were read monthly from October 1998 to September 1999 for all nine stations near the mine. In <br />addition, the staff gage at station SW'-A001 was read six times between May 2001 and May 2003, and the <br />stal'fgage at station SW-BPL was read nineteen times between May 2001 and September 2003. <br />The tlows measured during 1998 - 1999 are summarized in Figure 7. Each measurement represents a <br />snapshot in time, rather than a monthly average. -I-he contemporaneous data are critical for determining <br />~~ains or losses in Ralston Creek as it passes through the mine property. "i-he instantaneous flow <br />measurements arc tabulated and shown graphically in Figure 8. <br />4s <br />40 <br />35 <br />v <br />W ?5 <br />H <br />Q <br />3 20 <br />O <br />J <br />LL <br />10 <br />- av~ <br />^ ~;~ <br />• BOS <br />x OS <br />• PL <br />^ 130iS <br />~ A001 <br />= SW-UC <br />^ tiW-UP <br />•;verage <br />SI <br />Ocl-59 Nov 5F? Dec.9d .Ian 54 Fab-~9 Mar-?9 Apr-99. May-% Jump Jub95 ?.~.~~.qg .: :.-S'--~ <br />Figure 7. Flow Rates Measured in Ralston Creek near the Schwartzwalder Mine, by Month, <br />1998 - 1999 <br />Glcvation is approximate I+vithin I Il) tier station SW'-f3OS <br />d I09H.Q71 1 16 Whetstone Associates • <br />