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Western Slope Carbon, Inc. <br />December 15, 1981 <br />Of the total annual precipitation, seven inches or 50% <br />usually falls in April through September, which includes <br />the growing season for most crops. In two years out of <br />ten, the rainfall in April through September is less than <br />five inches. The heaviest one day rainfall during the <br />period of record was 2.18 inches at Cedaredge on October <br />13, 1957. Thunderstorms number about 35 each year, and <br />about 21 thunderstorms occur in the summer. <br />Average seasonal snowfall is 45 inches in most of the <br />survey area, but is 15 inches at Delta. The greatest <br />snow depth at any one time during the period of record <br />was 35 inches. On the average, 20 to 25 days have at <br />least one inch of snow on the ground, but the number of <br />such days varies greatly from year to year. At Delta, <br />about 10 days have at least one inch of snow on the ground. <br />The average relative humidity in mid-afternoon during <br />spring is less than 33% and during the rest of the year <br />is about 44%. Humidity is higher at night and the average <br />at dawn is about 59 %. The percentage of possible sunshine <br />is 77 Y, in summer and 61% in winter. The prevailing wind <br />is from the east-southeast. Average windspeed is highest, <br />10 miles per hour, in June. <br />Page 10 <br />Table 5, Temperature and Precipitation Data, presents recorded climatological <br />information for the period 1957 to 1974 at Paonia. <br />CONCLUSIONS AND RECOMMENDATIONS <br />This section of the report presents our conclusions and recommendations based <br />on the field exploration, laboratory testing, and geotechnical analyses described <br />above, and on our interpretation of geotechnical conditions. <br />