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Month/ <br />Year <br />1999 <br />2000 <br />2001 <br />Maximum Wind Gust (miles per hour) <br />2002 2003 2004 2005 2006 2007 <br />2008 <br />2009 <br />2010 <br />Average <br />Gust <br />1999 - 2010 <br />Maximum <br />Gust <br />1999 - 2010 <br />Jan <br />52 <br />30 <br />47 <br />34 <br />19 <br />34 <br />42 <br />44 <br />43 <br />58 <br />31 <br />33 <br />38.9 <br />58 <br />Feb <br />54 <br />38 <br />41 <br />46 <br />45 <br />41 <br />24 <br />56 <br />48 <br />54 <br />39 <br />24 <br />42.5 <br />56 <br />Mar <br />52 <br />44 <br />49 <br />52 <br />45 <br />40 <br />37 <br />44 <br />54 <br />46 <br />56 <br />43 <br />46.8 <br />56 <br />Apr <br />52 <br />56 <br />54 <br />52 <br />52 <br />46 <br />51 <br />55 <br />58 <br />45 <br />45 <br />50 <br />51.3 <br />58 <br />May <br />51 <br />58 <br />43 <br />53 <br />49 <br />60 <br />44 <br />57 <br />47 <br />40 <br />35 <br />49 <br />48.8 <br />60 <br />Jun <br />54 <br />48 <br />44 <br />53 <br />52 <br />53 <br />76 <br />54 <br />54 <br />52 <br />43 <br />44 <br />52.3 <br />76 <br />Jul <br />45 <br />40 <br />58 <br />44 <br />43 <br />43 <br />43 <br />39 <br />41 <br />34 <br />41 <br />40 <br />42.6 <br />58 <br />Aug <br />34 <br />50 <br />44 <br />55 <br />40 <br />45 <br />40 <br />37 <br />33 <br />59 <br />40 <br />43 <br />43.3 <br />59 <br />Sep <br />37 <br />48 <br />43 <br />51 <br />48 <br />44 <br />57 <br />43 <br />52 <br />34 <br />51 <br />41 <br />45.8 <br />57 <br />Oct <br />46 <br />53 <br />45 <br />43 <br />53 <br />45 <br />51 <br />42 <br />43 <br />45 <br />42 <br />41 <br />45.8 <br />53 <br />Nov <br />54 <br />37 <br />39 <br />39 <br />48 <br />43 <br />43 <br />36 <br />31 <br />36 <br />29 <br />36 <br />39.3 <br />54 <br />Dec <br />35 <br />41 <br />44 <br />43 <br />51 <br />41 <br />34 <br />41 <br />35 <br />44 <br />39 <br />38 <br />40.5 <br />51 <br />JD -6 Mine Environmental Protection Plan <br />Table 15. Average Monthly Wind Speed (mph) at Nucla Meteorological Station <br />25 <br />1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 <br />4.5 3.4 3.5 4.1 3.3 2.1 4 4.3 4 3.2 3.1 2.6 <br />5.2 4.8 5 4.3 4.4 2.7 3.6 4.7 4.7 2.7 4.2 2.7 <br />6.9 4.5 4.7 6.2 5.6 5.1 5.1 5.9 4.7 5.6 6 4.6 <br />6.3 6.6 7.1 8.1 7.7 6 6.4 6.7 5.7 6.6 6.2 6.8 <br />7.7 7.5 6.1 7 6.5 7.3 6.1 6.4 5.4 6.1 4.8 7.6 <br />7.2 6.5 6.9 7.6 7.2 6.6 6.8 6.4 6.1 5.7 5.7 6.4 <br />5.8 5.8 6.1 5.7 6 6 5.4 4.9 5.2 4.6 5 4.7 <br />4.6 5.5 5 6 5.5 5.9 4.9 4.8 5.1 4.5 5.3 4.6 <br />5 6.2 5.4 5.1 5.4 5.5 5.4 5.2 5.5 4.6 4.9 4.8 <br />5.3 5 5.2 4.7 5.7 5.6 4.6 4.2 4.6 4.7 5.1 4.3 <br />3.9 4.2 4.3 4 5.1 3.6 4.3 4.3 3.4 3.5 3.6 4.2 <br />3.4 3.5 3.7 3.4 4.3 3.5 3.5 3.5 3.4 3.8 3.3 3.5 <br />Year / <br />Month <br />Jan <br />Feb <br />Mar <br />Apr <br />May <br />Jun <br />Jul <br />Aug <br />Sep <br />Oct <br />Nov <br />Dec <br />Average <br />1999- <br />2010 <br />3.5 <br />4.1 <br />5.4 <br />6.7 <br />6.5 <br />6.6 <br />5.4 <br />5.1 <br />5.3 <br />4.9 <br />4.0 <br />3.6 <br />Table 16. Average and Maximum Wind Speed (mph) at Nucla Meteorological Station <br />7.6 Evaporation <br />The local climate is mapped as having potential evaporation in excess of precipitation. The climate is <br />classified as a BSk semi -arid steppe, based on the widely used Koppen- Geiger climate classification system <br />which defines climate zone boundaries based on average annual and monthly temperature and precipitation, <br />and the seasonality of precipitation, which affect vegetation distribution. Group B climates include dry <br />(arid and semiarid desert) climates with potential evapotranspiration exceeding precipitation (PE > P). The <br />third letter in the classification ( "k ") indicates a middle latitude climate with an average annual temperature <br />below 18 °C (64 °F). <br />Monthly pan evaporation rates are measured at the nearest NWS meteorological stations in Montrose <br />(elevation 5,800 ft) and Grand Junction (elevation 4,800 ft) as shown in Table 17. The lower evaporation <br />rates measured in Montrose are representative of those occurring at the JD -6 Mine based on the similar <br />elevation and temperature profiles of the two sites (Table 17). At the nearby Pinon Ridge site, the pan <br />evaporation measured during a seven month period in 2008 was 55.26 inches (Kleinfelder, 2009). <br />Using a pan coefficient of 0.70, the annual free water surface (FWS) evaporation rate is 45.36 inches. <br />Evapotranspiration rates will vary based on plant cover and timing of available precipitation. <br />4148A.120927 Whetstone Associates <br />