Laserfiche WebLink
Memorandum to Kathy Welt <br />June 10, 1998 <br />Page 2 <br />1 <br /> of the sump at the northeast comer of longwall panel 1 NW. Water in this location <br />' has had the longest residence time and, hence, the longest time to evolve chemically <br /> in the sump environment from its original composition as in-mine fault water. Aiso, <br /> new samples have been collected from the sump side of the Lone Pine Seal. <br /> 2. The two sump sampling points aze at nearly opposite ends of the stunp. The 1NW <br /> Panel drill hole (DH-1) sampling point takes water from neaz the bottom of the sump <br />' and the Lone Pine Seal sampling point takes water from near the surface. Because <br /> of compartmenting and stratification, water from these two locations have <br /> differences in concentrations, but they aze similaz in major ion and isotope chemistry <br />' and, therefore, can be considered representative of water in the sump. A water <br /> sample from anywhere in the sump is likely to be similar to the collected samples. <br /> 3. The new water samples from the sump should be compared with the Edwazds Portal <br /> spring, rather than the individual fault waters. <br /> 4. New samples have also been collected from the Edwards Portal spring. <br />' S. The new data, based on three samples collected from each sampling point (1NW <br />Panel DH-1, Lone Pine Seal, and Edwazds Portal Spring) between 3/2/98 and 5/1/98, <br />aze very consistent and can be regazded as reliable. <br />' We believe that all present agreed that the 1998 measurements of sump water from the <br />NW Panel DH-1 and Lone Pine Seal sampling locations are representative of the sump <br />water quality and should be used for comparison with the Edwards Portal spring water <br />quality, rather than the fault water measurements. <br />COMPARISON OF WATER PARAMETERS IN WEM SUMP AND EDWARDS <br />PORTAL SPRING <br />' We then reviewed seven water parameters whose values shed light on possible sources of <br />the water issuing from the Edwazds Portal spring. These were: TDS, Na', S"C, S"S,'H, <br />"C, and water temperature. <br />t Total Dissolved Solids <br />' The total dissolved solids (TDS) concentration of the Edwards Portal spring is about 3500 <br />mg/L. The TDS at the two sump sampling points ranges between about 4500 mg/L and <br />7100 mg/L, 1.3 to 2.0 times higher than the spring. If the sump is a major contributor to <br />' water from the spring, a reasonable explanation must exist for the decrease in TDS at the <br />spring. <br />The main contributors to TDS in both the sump and spring waters are bicazbonates and <br />sulfates. However, the fact that the sump waters are under-saturated with respect to <br />