Laserfiche WebLink
A new NPDES permit was issued for Seneca Coal Company on September 26, <br />2006. It went into effect November 1, 2006. Quarterly monitoring <br />requirements went into effect in the first quarter of 2007. Monitoring <br />at all Seneca II outfalls in now required on a monthly or quarterly <br />basis. See the Seneca II PAP, Appendix 7-5, for the new permit. <br />Due to the closing of the Seneca II Mine, SCC requested a reduction in <br />monitoring frequencies of streams, springs and wells. TR 45 was approved <br />on June 29, 2007. The changes are as following. <br />For ground water monitoring wells, the frequency of water level <br />measurements was changed from tri-annual to semi-annual (May/June and <br />September/October). Water quality sampling of alluvial and spoil wells <br />remains semi-annual. Water quality sampling of bedrock wells was change <br />from semi-annual to annual (May/June). Water quality sampling was <br />discontinued at wells GW-S6-A, GW-S31-A2, GW-S32-A, GW-S33-A, and GW- <br />S46-A. For stream sites, monitoring at SW-S2-2, lower Grassy Creek, was <br />changed from monthly to tri-annual (spring runoff, post-runoff and <br />baseflow). For spoil springs, monitoring was changed from semi-annual <br />to annual (May to July). <br />Meteorological Data <br />Precipitation data was obtained at the Seneca II Mine using a Belfort <br />Weighing Bucket Rain Gage. Daily precipitation data for this year are <br />presented in Table 1. Total monthly precipitation data collected since <br />1981 are presented in Table 2. Where indicated, data from the U.S. <br />Weather Service - Hayden Station were used. Temperature, wind speed and <br />direction data are presented in Appendix B of the Seneca II-W AHR. The <br />Seneca II-W Mine Meteorological Station located approximately seven <br />miles southwest of the Seneca II Mine. Climatic conditions are similar <br />between the two mines. <br />Data from the National Climatic Data Center's Hayden Station is used • <br />here to evaluate the precipitation trend. For this year, 18.63 inches <br />of precipitation was measured, which is 1.29 inches (7%) above the 1971- <br />2 <br />