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• project's surface facilities and a secondary (remote) site was located on the opposite (south) side of Coal Ridge. All monitoring siting activities complied with U.S. Environmental Protection Agency (EPA) guidelines. This data will be used in obtaining additional air quality permits, as needed. It is anticipated that winds in the project area will exhibit a somewhat bimodal distribution. Large scale atmospheric circula- tions should result in a maxima from the west to west-northwest. Nighttime drainage flow under otherwise calm conditions should produce a maxima from the east-southeast to south (EH&A, 1983). During the first six months of monitoring at the primary site, the prevailing wind was found to be southeast (135 degrees) with an average velocity of 5.3 mph. Table 3.4-1 presents monthly and annual temperature data from the cooperative weather station at Glenwood Springs for the 1951-1980 • period (US. Dept. of Commerce, 1982). The annual average tempera- ture is approximately 47 degrees Fahrenheit. Average daily temperatures during mid-winter range from the low teens at night, to the upper 30's during the afternoon. During the summertime, the typical daily temperatures vary from the low 50's at night, to the upper 80's during the afternoon. Annual temperature extremes in the area are estimated to vary from 10 to 20 degrees Fahrenheit below zero, to the upper 90's. Table 3.9-2 presents monthly and annual precipitation averages from Glenwood Springs for the period 1951-1980 (U.S. Dept. of Commerce, 1982). The 30-year annual average precipitation is just over 16 inches. There is very little seasonal variation in precipitation amounts, with each monthly average ranging between one and two inches. Winter snowfall during a typical year is estimated to be approximately 60 inches (Baldwin, 1979). • NCEC - Coal Ridge ~1 3-51 ABC/1145/900301