2008-05-06_REPORT - C1994082 - Laserfiche WebLink

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A new NPDES permit was issued for Seneca Coal Company on September 26, 2006. It went into effect November 1, 2006. Quarterly monitoring requirements went into effect in the first quarter of 2007. See the Yoast PAP, Appendix 15-1, for the new permit. Due to the closing of the Yoast Mine, SCC requested a reduction in monitoring frequencies of streams, springs and wells. TR 34 was approved on June 29, 2007. The changes are as following. For ground water monitoring wells, the frequency of water level measurements was changed from tri-annual to semi-annual (May/June and September/October). Water quality sampling was discontinued at Sage Creek alluvial Well YSAL8. For stream sites, monitoring at YSS2 (Sage Creek below Pond 012) was changed from monthly to tri-annual (spring runoff, post-runoff and baseflow) For spoil springs, monitoring was changed from semi-annual to annual (May - July). Three new spoil springs (#2, 3 and 4) were included into the monitoring program. Meteorological Data No meteorological data is collected at the Yoast Mine. SCC maintains a weather station (wind speed and direction, temperature and precipitation) at its adjacent Seneca II-W Mine. The reader is referred to that AHR, Appendix B. SCC also maintains a precipitation gage at its adjacent Seneca II Mine. Data for this year are included on Table 1. A summary of all data collected at that station is provided here in Table 2. Data from the National Climatic Data Center's Hayden Station is used here to evaluate the precipitation trend. For this year, 18.63 inches of precipitation was measured, which is 1.29 inches (7%) above the 1971- 2000 average. Only the months of October, February, March and September were above average. Snowpack runoff, as estimated by totaling November through March precipitation values, was 6.61 inches, which was 0.57 inches (8%) below the 1971-2000 average. 2