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Long term average precipitation for the Walden station is 10.42 inche In only one of the last six <br />years has this average not been exceeded (Figs. 7a and 7b) As can be seen from the graphs, <br />1994 was a below average year for precipitation. Consequently, in May 1995, total precipitation <br />for the previous 12 months was below average (Fig. 8). In May of 1995, 5.42 inches of <br />precipitation were received at the Walden station. This set the stage for what proved, overall, to <br />be an above average year for precipitation (18.15 inches). Total precipitation for the previous 6 <br />(Fig. 9) and previous 4 (Fig. 10} months was above average in June and July of 1995. 1996 was <br />also above average (13.61 inches) with the largest events occurred during the winter months that <br />preceded and followed the growing season. Total precipitation for the previous 12 months was <br />high in May of 1996; but total precipitation for the previous 6 months and for the previous 4 <br />months lower but still above average throughout the growing season. In 1997, 4.22 inches ofi the <br />annual total (15.38 inches) were received during the month of September. January and April of <br />1997 were also very wet. Precipitation in 1998 exceeded the long term average with 2.53 inches <br />of the annual total received during the month of June. To date, 1999 has been an above average <br />year. Monthly averages have been exceeded in six of the first seven months of the year and a <br />total of 9.57 inches had been recorded at the end of July. Total precipitation for the previous 12 <br />months was near average in April and has improved throughout the season. Total precipitation <br />for the previous 6 and previous 4 months is also above average. Figure 11 indicates that W alden <br />has experienced several warm years in a row. In general, warmer temperatures would be <br />expected to increase evapotranspiration and may ameliorate some of the increased precipitation <br />observed over the last several years. <br />Cover <br />Total vegetation cover for the areas sampled in 1999 is summarized in Table 16, Relative Cover <br />Data Summary, is represented graphically in Fig. 1, and is detailed in each of the cover tables <br />(See 1999 Cover Data tables in Appendix 1). Reclamation at the Kerr Mine is deemed successful <br />for cover when total vegetation cover in the reclamation block exceed 90°/, of acreage weighted <br />reference area standard. Details regarding weighted reference area are included in the section, <br />"Statistical Methods- Reclamation Area Success Standards". The calculated success standards <br />and area means for each of the reclaimed areas are included in the following table: <br />Total Vegetation Cover <br />Pre-1986 Rec. 1995 Rec. 1996 Rec. <br />Area Mean 23.0 37.3 31.9 <br />Cover Success Standard 32.5 30.0 31.8 <br />Cover values in the 1995 and 1996 Reclamation values exceeded the cover success standard <br />and both areas are considered successful for this parameter.. Cover values for the Pre-1986 <br />Reclamation Area were less than the cover success standard and hypothesis testing was <br />employed in an effort to demonstrate the statistical insignificance of this difference. Terms used <br />in the general form of the aone-sample t-test, described in the section "Statistical Methods: Post <br />Mining Comparison with Hypothesis Testing" were: <br />Q = 32.45 <br />x = 23.0 <br />= 23 <br />13 <br />