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z7 <br />• at each sampling site. The exceptions were one site at Marr Strip No. 1 <br />and one site at Edna where three replications each were performed, and <br />one site at GEC S and A and the site at Seneca where five replications <br />were performed. <br />Site by Site Comparisons <br /> Since the sampling sites are so widely distributed, there is consi- <br /> derable variation in climate. Table 1 shows a site by site comparison <br /> of climatic characteristics, with the climatic data for each particular <br /> site taken from the nearest climate station (Bend and McKee, 1977). <br /> The rainfall intensity characteristics were determined from the Precipi- <br /> tation Frequency Atlas for the Western States (U.S. National Weather <br />• Service, 1973). The amount of warm season precipitation (May-Oct.), <br /> which is primarily rainfall, is quite consistent throughout the sampling <br /> area but the July mean temperatures show considerable variability. Snow- <br /> fall is heaviest in the northwest Colorado coal regions, and with the <br />, <br /> low January mean temperatures in that area there is usually a substantial <br />1 accumulation of snow in the winter with resultant snowmelt in the spring. <br /> Lower mean annual snowfall and higher January mean temperatures in <br /> central and southern Colorado (Canon City and Raton Mesa Coal Regions) <br /> indicate less snow accumulation and less significant snowmelt during the <br /> spring. However, the 2 year 24 hour storms of the Canon City and Raton <br /> Mesa Coal Regions, which are probably high intensity summer convectional <br /> thunderstorms, are higher than the other regions. <br />With the exception of the two sampling sites at Marr Strip No. l <br />• where the coal bed being extracted is Paleocene, all of the sampling <br />