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• GRAND MESA COAL COMPANY 1985 HYDROLOGIC REPORT DATA OCTOBER 1984 THROUGH SEPTEMBER• SURFACE WATER ~~~ oE~l ~~~! ~~ 8~ Table S-85 is a listing of monitoring results for the surface water. Monitoring accuracy of flow in Williams and Ward Creek improved during this monitoring period. The average flow was taken monthly on upper Ward Creek and Williams Creek. Daily water levels on lower Ward Creek were taken during the irrigation season and monthly for the duration of the year. The lower Ward Creek gauge conversion, Diagram 5-85, was drawn from information supplied by Steve Tuck, the Ward Creek "ditch rider" for the Colorado Irrigation Division No. 4. Using this conversion chart the average flow for the May - • September irrigation season was calculated to be 29.67 cfs. The flow rates for the creeks in Table 5-85 were taken from monthly spot readings. The average pH was higher and the conductivity was lower at these locations this year compared to last year. Monitoring continued weekly for flow in SP-A through SP-D and in Nelson Ditch. The results on SP-A, B and C this year indicated a losing reach again but by a smaller margin. We have been informed that the inflows into the old Blossem Mine nearby are affected by SP-B flows. The low flow monitoring accuracy on SP-C was improved by the installation of an 18-inch H-Flume in March 1985. The Nelson Ditch monitoring was upgraded this year by the installation of an 18-inch Parshall Flume. The average flow, 1.42 cfs, on the Nelson Ditch represents most of the irrigation season and would compare with 2.56 cfs for SP-D during the same period. The mine discharge, UG-6, flows through SP-B and represents an estimated 958 or more of its flow. The 158 loss of mine water • represents evaporation and infiltration losses as well as gauging errors (totalizing meter readings vs weekly instantaneous readings).