2013-05-16_HYDROLOGY - C1981014 - Laserfiche WebLink

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as shown on the Southfield Mine Map as revised 12/15/00. Between points A and B Newlin Creek has a grade of -0.08% for a distance of 69.4 ft. We have compared the Newlin Creek profile with the Southfield Mine Area Surface and Groundwater Hydrology Map 12, which is the only known source of surface topography information prior to the underground mining. While the contour interval is 5 ft., it is noted that Energy has relied on this map for such purposes as establishing the elevation of the MWNW. The area of concern of possible Newlin Creek subsidence is above the 1' /z North Panel which has a face date of 1/11/1996. The creek crosses this panel for a distance of about 400 ft. Map 12 shows the contour lines to be almost equidistant 125 ft. apart horizontally for a grade of approximately 4 %. Map 12 is of sufficient definition to show that the flow line profile of today was not possible prior to the underground mining when Map 12 was generated on 11/10/89; there are no sufficiently greater grades in this vicinity in order to offset the - 0.08% grade to result in map average 4% in this area. NEWLIN CREEK FLOW According to the Southfield Annual Hydrology Report Newlin Creek has historically disappeared into the ground. We believe that the amount of flow disappearing has greatly increased in the last three or four years. With no way to quantify our observations we would call attention to Energy's reported data as reported in the Annual Hydrology Report. Since 1999 the flows of Newlin Creek during the second quarter of the respective years are: NEWLIN CREEK FLOW, CFS Year NC2(upper) NC1(lower) 1999 10.5 9.5 2000 2.4 1.6 2004 7.8 7.8 2005 12.4 12.6 2007 10.8 10.7 2009 2.1 0.001 2010 1.2 0.63 There was no flow at the lower monitoring point for the years not included. Since 1999 there was little difference in the amount of flow until 2009 when very little of the flow reached the NC1 monitoring point. Energy's own annual hydrology reports confirm our contention that flow is being lost before it reaches NC1. With regard to the flow in 2012, there are a few records. On March 27, 2012, the DRMS inspection report shows Newlin Creek flow to be 5 ft. wide and 4 in. deep at a point just downstream from NC2. According to the Annual Hydrology reports on April 2, 2012, and June 6, 2011, there was no flow at NC2, and Table 9 lists no flow at NC2. However, according to George Patterson's hand written notes on EFCI Surface Water Field Data sheets there was flow with less than 1 in. of water at NC2 on April 2, 2012, and slight flow on June 61 2011. On April 5, 2012, there was a water depth of 2 in. at NC2, and George's Field Data sheet shows an estimate of 0.8 cfs flow. This is the only record of flow at NC2 for 2012 in the Field Data Sheet with all of the other water depth measurements recorded for flow at