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measured are shown in the following table. Because historic and recent water quality data from <br />Sump Number One indicates that uranium is the only constituent requiring treatment to meet <br />water quality standards in Ralston Creek, Cotter proposes modifying the daily discharge <br />sampling and analysis requirement for radium 226+228 to a monthly composite, and pH, and <br />oil/grease to a weekly composite to be collected with the weekly uranium sample. Daily <br />sampling and analysis for these parameters would be excessive and unnecessarily onerous to <br />implement. <br />parameter Measurement Frequency Sample Type <br />Flow, MGD Continuous Recorder <br />COD, mg/7 Once per month Composite <br />TSS, mg/7 Once per month Composite <br />Uranium, PD, ug/! Meekly Composite <br />Radium 226+228 (total), POW Once per month Composite <br />pH, s.u. Weekly Grab <br />Oil and Grease, mg/7 Weekly visual * - <br />Antimony, T.R ug4 Once per month Composite <br />Boron, mg/l Once per month Composite <br />Chromium, TR ug/l Once per month Composite <br />Copper, PD, ugA Once per month Composite <br />,Silver, PD, ug/I Once per month Composite <br />'Zinc, PD, ug/I Once per month Composite <br />Cyanide, WAD, ug/l Once per month Grab <br />,Fluoride, m94 Once per month Composite <br />Thallium, TR, ug4 Once per month Composite <br />hole Effluent Toxicity, Chronic Lethality <br />Ceriodaphnia species Semi-annually 3 CompositeslTest <br />Fathead Minnow (Pimephalespromelas) Annually (first halfofyear) 3 Composites/Test <br />al"Li[GtS S?laEn 4in?t ,Qgr ,Satt[?i5:.?f?/'U6 L4lleLt5?dlYl Qt17 'F5L?f670[i tlfl?g/i'+1E, n14i ult:mtolere,C+".dontheDlEurdi' <br />parantsisrU3S&?. <br />In addition to the above discharge monitoring program for interim water treatment, Cotter <br />will conduct stream sampling for locations, parameters, and frequencies as identified in <br />the following table. Sampling locations are also shown in the following map figure: <br />Station Name Northing Easting Elevation Description Sampling Frequency/ Parameters <br />SW-AWD 734870.0 2059850.0 6639.9 Above Waste Dump (above site) 1,2 <br />SW-A001 733673.75 2061141.35 6590.57 Above Discharge (outiall 001) 1 <br />SW-BDIS 733336.16 2061476.31 6577.34 Below Discharge (outlall 001) 1 <br />SW-PL 733088.71 2061744.42 6563.94 Parking Lot 1 <br />SW-OS 732902.10 2062102.41 6551.92 Ore Sorter 1 <br />SW-BOS 732696.77 2062307.12 6533.43 Below Ore Sorter 1 <br />SW-GS 732466.73 2062546.19 6533.43 Guard Shack 1 <br />SW-BPL 732144.38 2063063.84 6508.97 Below Property Line (below site) 1,2 <br />- ••???ry ?u?arnw new nicaauicnic nw vi temp, pn, ana Go nO UGIIVIryJ <br />2- Monthly [uranium (total & dissolved); molybdenum (total & dissolved); phosphorus; phosphate; nitrate+nitrite; <br />gross alpha; gross beta; total dissolved solids; total suspended solids; radium 226+228 (total); pH; <br />antimony (total); boron; chromium (total); copper (dissolved); silver (dissolved); zinc (dissolved); <br />cyanide (weak acid dissociable);fluoride; thaIlium (total)] <br />6