2010-05-07_PERMIT FILE - C2009087 (7)

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RULE 2 - PERMITS Springs is located approximately 15 miles east - northeast, and the Seneca II W data collection site • was located about eight miles west of the PSCM permit area. Temperature records at all locations indicate a seasonal pattern with the coldest temperatures in December through February, gradual - warming beginning in late - March, maximum temperatures in July and August, and gradual cooling beginning in late August. Recorded temperatures range from highs in the mid -80's in the summer to lows occasionally falling below zero degrees Fahrenheit in the winter. Temperatures in the permit area are likely within five to 10 degrees of recorded temperatures due to similarity in terrain and proximity of the monitoring sites. However, the PSCM permit area is not near any bodies of water, unlike Steamboat and Hayden which are moderated by the nearby Yampa River. Tables 2.04.8 -T1 through 2.04.8 -T4 summarize average monthly mean, high, and low temperatures for the period of record analyzed for each monitoring site. Precipitation The three closest meteorological stations with recorded precipitation data are located at Hayden, the previous Seneca Mine, and Steamboat Springs. Precipitation has been recorded at Seneca II since 1981 and will continue operation serving the needs of both Seneca II and Sage Creek. The Seneca II monitoring site is located within the PSCM permit area. Precipitation data indicate the majority of precipitation occurs in the fall and winter months with reduced precipitation during the summer. Total average annual precipitation is approximately 18.9 inches at Hayden, 24.0 inches at Steamboat Springs, and 16.4 inches at Seneca II. Maximum and minimum precipitation occurs during the months of September and July, respectively. Table's 2.04.8 -T5, 2.04.8 -T6 and 2.04.8 - T7 summarize average monthly total precipitation for 2003 - 2008 for each site. • Wind The two closest meteorological stations with available wind direction and speed data are located at the Seneca II W monitoring site and at Hayden. Wind data have been collected at the Sage Creek site since fall of 2008. Wind records for the Sage Creek monitoring station for November, 2008 — October, 2009 are also included, and wind flow patterns appear similar to those observed at Seneca II W and Hayden. Wind data from all three monitoring sites indicate prevailing surface winds are generally from the east, east - southeast, and southeast directions. Wind speeds less than four miles per hour ( <1.8 m/s) occur a majority of the time at Seneca II, but occur only 11 percent to 32 percent of the time at the Sage Creek and Hayden sites. Mean wind speeds at all three monitoring sites range from 1.9 to 5.1 mean speed (m/s) (four to 11 miles per hour (mph)). Recorded wind data for the indicated reporting period are summarized in Tables 2.04.8 -T8, 2.04.8 -T9, and 2.04.8410 and by wind roses presented in Figures 2.04.8 -F1, 2.04.8 -F2, and 2.04.8 -F3. LJ PSCM Permit App. 2.04 -110 Revision 12/17/09