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1 <br />Mr. Richard Mills - 2 - February 19, 1987 <br />There does seem to he a more pronounced disparity when high concentrations are <br />observed. Six samples were run in both the laboratory and the field at site <br />27A and 1003 during the 3rd quarter of 1986 and laboratory values were more <br />reproducible. TDS/EC values (lab) average 0.71+0.04 whereas TDS/EC values <br />(field) average 0.64+0.20. As the Division is very concerned about regular <br />monitoring of the salinity at all Cyprus permit areas in Twentymile Park, the <br />Division requests that Yampa Valley Coal Company prepare a response which <br />addresses this issue within thirty days. This response should document in <br />detail the current sampling procedure for field electrical conductivity <br />measurements and propose modifications to ensure good salinity values for the <br />Division. <br />The water quality of alluvial well 008-AW-3, immediately below the tipple <br />pond, showed statistically significant deterioration during the last year. <br />Levels of TDS and sulfate monitored during the 1986 water year were <br />substantially higher than those recorded during the previous eighteen months. <br />The AHR narrative attributes this phenomenon to the adjacent Mine 3 spoils. <br />The Division tentatively accepts this analysis but is concerned about TDS <br />levels in the Fish Creek AVF downstream from the Tipple and the associated <br />impact to vegetation productivity. The Division will not insist on additional <br />monitoring at this time for two reasons. One, the Mine 3 Spoils in this area <br />have been released from bond, and two, further impact from Cyprus properties <br />will not occur, in all probability, until the Fish Creek bore hole shaft is <br />constructed. <br />Please call if you have any questions. <br />Sincerely, <br /> <br />Catherine W. Begej <br />Reclamation Specialist <br />CWB/tmb <br />cc: Brent Anderson <br />7487E <br />