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<br />Mr. David Berry <br />October 4, 1988 <br />Page 13 <br />r~ <br />u <br />Another point to consider is that the Basic Standards have been modified and <br />provide for using water hardness to determine the silver standard. This <br />will result in an accurate assessment of potential chronic impacts to <br />salmonoid species. <br />CMLRD CONCERN: <br />Surface Water <br />The surface Water monitoring network includes sites operated by both <br />Colorado Yampa Coal Company and the U.S. Geological Survey. In general, <br />relatively elevated values for electrical conductivity, total dissolved <br />solids, iron, manganese, and/or sulphate are observed at sites along Foidel, <br />Middle, Fish and Trout creeks. Specific observations and requests are <br />listed below. <br />Creek Stations - <br />he content of Figure 36 (stations 8 and 14) is extremely. helpful; <br />owever, the graph is not easily interpreted because too much <br />information is displayed. Please consider distributing the information <br />over two or three graphs in the next AHR to allow easier interpretation. <br />i <br />2 (~ tation 800 exhibits elevated silver levels. Zinc levels have also <br />been relatively high. <br />3~ Please check the April 1981 (Station 800) molybdenum value, it may be <br />Please include a- graph representing electrical conductivity for Station <br />800, with the nett AHR. Sha,(~ ~~+,,,,A~ g;,eo~ (uac- ~ ~(9w ~t /~f <br />S.~JWhy are two stations (Station 8 and Station 2005) used, one for <br />monitoring water quality and one for discharge. All data should be <br />collected at the same site. Please verify that quality and discharge <br />data will be collected at the same location. <br />6~ Electrical conductivity seems to be increasing over time at Station 8. <br />Values downstream (Station 8) are higher than those recorded at the <br />upstream station (Station 14) as shown in Figure 34. This increase may <br />~D or may not be related only to low flow in Foidel Creek during 1987. <br />Further evaluation will be conducted to allow a more complete analysis <br />of this possible trend. <br />7.1~!/ Elevated silver values have been observed at Station 8/2005. <br /> <br />in error <br />Please provide a graph of electrical conductivity for Station 900, with <br />the ner.t AHR. <br />