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• <br />Location Cover <br /># of sam les Herb. Prod. <br /># of sam les <br />2000 Reclamation Areas <br />Area 6 4.1 ac. 6 8 <br />Area 19 (3.2 ac. 4 7 <br />Total Sam les 2000 Areas 10 15 <br /> <br />2002 Reclamation Areas <br />Area 23 0.66 ac. 1 1 <br />Area 25 12.6 ac. 9 14 <br />Total Sam les 2002 Areas 10 15 <br /> <br />2003 Reclamation Area <br />Area 29 8.1 ac. 10 15 <br />Sample sites were located in the field through compass triangulation and pacing from known <br />landmazks. Figure 1 illustrates the location of the reclaimed areas and sample point locations <br />within each azea sampled. <br />Quantitative evaluation of revegetation success was undertaken this yeaz in Area 16 of the <br />1995 Reclamation Areas, the 1998 reseeded or interseeded areas, and the 1999, 2000, 2002, <br />and 2003 reclamation areas. The 1985, 1986, and 1987 azeas were previously monitored <br />(1994-1998) and after successfully meeting revegetation success criteria, were released from <br />Phase II liability requirements by CDRMS August 11, 1998. The 1995 and 1997 azeas were <br />previously monitored (1998-2004) and after successfully meeting revegetation success <br />standazds a Phase II bond release was approved on June 15, 2006 by CDRMS. This year, as a <br />precursor for application for Phase III bond release, the 1985, 1986, 1987, 1995 and 1997 <br />azeas were quantitatively sampled for vegetation cover, total herbaceous production, and <br />species composition. The results of those evaluations are contained in a separate companion <br />report. <br />2.2 FIELD SAMPLING <br />• <br />2.2.1 Timing <br />Field investigation was undertaken during the period August 6 through August 10, 2007. <br />This time period coincided with anthesis and maximum development of the majority of plant <br />species found in the reclaimed areas at the mine site to be evaluated. Total annual <br />precipitation at the mine in calendar year 2007 was above normal, attributable in part to 4.47 <br />inches of precipitation received in May thundershowers. While precipitation at the mine was <br />55 percent below average in September 2006, October and December 2006 precipitation was <br />154 and 814 percent above average, lazgely due to the heavy snow pack from the December <br />blizzard. Precipitation from January to April 2007 fluctuated above and below the average, <br />while heavy precipitation in May was 198 percent above average. June precipitation was <br />significantly lower than average, with July 2007 amounts slightly above average. <br />Coors Energy Company Keenesburg Mine Page 8 <br />2007 fZevegetation Monitoring ReporC <br />