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Table 1. Estimated Pre-Mine Ground-Water Gradient within <br /> the Fractured Bedrock <br /> Elevation' Distance' from Gradient' <br /> (feet msl) Workings under from head of <br /> Sunnyside Basin Sunnyside <br /> (feet) Basin to <br /> indicated <br /> point <br /> Cement Creek near Portal 10,500 9,500 0.105 <br /> of American Tunnel <br /> Discharge Zone near Mogul Mine 11,250 6,300 0.040 <br /> Portal <br /> Animas River at Site of Eureka 9,850 15,600 0.106 <br /> Eureka Gulch near Midw y 10,480 9,300 0.110 <br /> Mill Site <br /> 1) Estimated from U.S.G.S. Handies Peak and Ironton 7 1/2 minute quadrangles <br /> 2) Assumes the pre-mine hydraulic head in the fractured bedrock beneath Lake Emma was approximately <br /> 11,500 feet above mean sea level (based on the 1959 water-level observation of Mr. Bob Ward). <br /> sanjuan\sunny\11036 1\oct9 1.Rpt 20 <br /> m simon mnumn=anonm <br />