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. Mr. Steve Shuey <br />March 16, 1998 • • <br />Page 3 <br /> Table 1 Lower Windy Gulch surface water sample analyses <br />Sample name WG-3A "' WGWB1D1 WGWB1b1 WGW79593-2 WGWB 1°' <br /> ~~~ <br />Sample date 4!19/94 7!14/94 5/31/95 7!7/95 10/2/97 <br />Parameter Img/L) <br />Arsenic, total 0.012 0.020 0.008 <br />Arsenic, diss 0.016 <br />Cadmium, total 0.024 0.019 0.054 0.064 <br />Cadmium, diss 0.053 <br />Copper, total 0.030 0.030 O.OfO <br />Copper, diss 0.023 0.020 <br />Iron, total 0.720 <0.01 0.643 0.050 0.020 <br />Iron, diss 0.235 <0.05 <br />Lead, total <0.02 0.002 0.004 <0.02 0.002 <br />Lead, diss 0.003 <0.02 <br />Manganese. total 0.010 0.010 2.860 0.010 <br />Manganese, diss 2.820 <br />Mercury, total <0.001 <br />Mercury, diss <br />Zinc, total 2.62 4.40 5.30 10.90 17.00 <br />Zinc, diss 5.43 11.00 15.90 <br />Sulfate 68 295 133 239 550 <br />Conductivity, 729 89 440 1200 <br />umhos/cm <br />TDS 554 349 9fi0 <br />TSS 4 8 <br />pH lab 6.60 7.10 7.00 7.10 6.00 <br />pH field 6.76 7.3 <br />la) Sampling location downstream mine, below culvert <br />Ibl Sampling location near flume <br />Icl Sampling location downstream of mine, upstream of flume <br />It is the position of Homestake that surface water quality monitoring should be conducted to <br />determine "rf there are any negative impacts on water quality in Windy Gulch that occur as a <br />resuk of the edit plug. Homestake does not consider injection of a tracer behind the plug, as <br />suggested in your item 3, to be a definitive way of monitoring potential effects of the adk <br />plug for the following reasons: <br />Tracers would provide information only on a small segment of the flow path <br />within the Creede Formation, not quantitative water quality information. <br />Water quality monitoring in Windy Gulch will be needed for some period of <br />time whether a tracer is used or not. Since water qualrty impacts are the <br />issue of concern, water quality monitoring should be the focus. <br />