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2.0 I1:T.~L?!CTIC:: <br />T'ne fo'_Ioi,-inC presents water quality data and irterpretatiens from collectic.•~s <br />• made April to October, 1973, on the North Fork or the G~nnisor. River and Stevens <br />Gulch in the vicinity oS the Orchard Valley mine. These data add to inSormation <br />presented in the Final Report (Erickson, Januar;,1978) and the subsequent <br />Semi-,'..-inual Report (Eric}son, 1;ay 1978). <br />2.1 hca;ion and C~neral Lrscrio:ion <br />Figure 1 illustrates the sample sites used on the north Fort, and Stevens Gulch. <br />This figure is the same as that used in previous reports except that tvo new <br />stations have been added. Station 1F-4b is approri.:.ately lOG yards below I:'~-4a <br />and is used to repreeent conditions in a r„icing zone. Platers irSluer,cing data ' <br />in the rixing zone would be the North Fork, Stevens Gulch, and N.innesota Creek. <br />Station ttC-1 is located near the mouth of t'iresota Creek and is used to detezsine <br />~ • the izi'lueace oS i~innesota Cree}: on rater quality r.~thin the mi:.ing zcne. <br />17orth Fork stations are numbered Srom upstream to downstream (Ir-la, -Zo, <br />-3a, -4a}. Station }tF=1a is a control station above ar~o• influence oS the mine or <br />coal load-out area. Station 1\r-7.~ is below any m=jor influence of the load-out <br />area. Stations I~`F-3a and -4a are just above and just below the entrance oS Stevens <br />Gulch creek on the North Fork. <br />Stevens L~lch has been divided into several sections for convenience oS <br />discussion and to deterrine potential sources o: water quality parameters measured. <br />The "upper gulch" is considered to be above arty influence oS existing mining <br />operations Station SG-la monitors Slow Sror,, this area. The "middle teach" <br />includes the bul}: of the sampling stations and rvn_s fror., below SG-la to just <br />' • <br />except for test hole drilling in the upper drainage. <br />2-1 <br />