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Water levels below Tailings Pond No. 3 were essentially constant <br /> during 1987 . Well no. 7 shows a flat hydrograph, while well no. 4 <br /> was dry part of the year (Figures 3 and 4 , respec--ively) . <br /> Wells used to illustrate water level fluctua-ions in Tailings <br /> ':e:ad No . 4 are located on Figure 5 . The water level in the north and <br /> so--th ends of the embankment has risen since late 1986 to a peak in <br /> july 1987 (Figures 6 and 7 , respectively) . The very high initial <br /> Sept . 1986 water level at well no. 21 (Figure 7 ) resulted from the <br /> close proximity of the cyclone during the well measurement. Since <br /> juiy 1987 the water level in these areas has remained relatively <br /> 'zcnstant. In the central portion of the embankment the water level <br /> has remained constant from late 1986 to early 19E -'- (Figure 8 ) . <br /> Two hydrologic cross sections were constructer through the <br /> em':)ankment ( see Figure 5 for locations ) to illustrate the <br /> po-entiometric surface within the embankment and it' s relationship to <br /> Colorado State Highway 110 (Figures 9 and 10 ) . r:�th show that the <br /> emankment is well drained and the water surface is at least ten feet <br /> below the road surface. <br /> Quality Water quality data are collected from both engineering <br /> of---"ice settling pond wells. Water quality in the two wells is <br /> essentially identical (Table 5) . EOMW-1 appears .o be a poorer <br /> completion, resulting in more turbid waters during sampling. In the <br /> fu.ure the well will be developed with a pump before sampling. Three <br /> casing volumes were removed by bailer from each well before samples <br /> were collected. Water type is again calcium sulfate with similar <br /> dissolved metals and pH to the Animas River, as would be expected in <br /> these coarse gravels within 100 feet of the river bank. <br /> -23- <br />