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May 1999 4 <br />Energy Fuek Coal, Inc. 1998 Aawn] Hydrobgy Report <br />QUARTERLY HYDROLOGY MONITORING PROGRAM <br />DATA SUMMARY <br />(Period January 1, 1998 through December 31, 1998) <br />This section of the 1998 AHR presents all surface and ground water data collected at the <br />Southfield Mine from 1979 through the end of the reporting period. Discussion of these data, <br />including potential impacts and trends, follows below. <br />Field and laboratory data collected from approved monitoring points on Newlin, Oak, Magpie <br />and Second Alkali Creeks are shown on water quality Tables 10, 11, 12, 13, 14, 15, 16, and <br />17. Stream flow measurements for these monitoring locations are summarized on Table 9. <br />Monitoring of upstream and downstream locations on Newlin, Magpie and Oak Creeks was <br />continued during the reporting period. EFCI voluntarily began monitoring two locations on <br />the referenced creeks during the second quarter of 1997. Data from the additional monitoring <br />is included in the stream quality and quantity data summary tables. <br />Stream flows occurred during the spring and summer months in response to snow melt and <br />precipitation events during the reporting period. Measurable flows were monitored in all the <br />streams. Newlin Creek flowed, at low levels, into the 2nd quarter due to heavy rains received <br />during early Spring. In Oak Creek, low flows persisted during the second and third quarters <br />of the reporting period. Similar to previous reporting periods, Second Alkali Creek exhibited <br />infrequent, low flow patterns in response to precipitation events. <br />Review of the accompanying water quality data indicate no unusual or harmful trends. Data <br />for Oak Creek monitoring indicate slightly increasing levels of TDS, calcium, sodium and <br />sulfate downstream as compared to the upstream location. Field measurements of conductivity <br />similarly show an upward trend. <br />The data for Newlin Creek show no significant changes from the upstream and downstream <br />monitoring locations, and are comparable to ranges found in previous monitoring periods. No <br />deterioration of Newlin Creek or Oak Creek resulting from mining is apparent from the water <br />quality data collected to date. <br />Monitoring data from Magpie Creek upstream location show increasing levels of sulfate, <br />conductivity and manganese. In addition, the quality data indicate slightly increasing levels of <br />TDS, TSS, conductivity, calcium, magnesium and sulfate downstream as compared to the <br />upstream location. These data indicate no significant impacts due to mining. <br />