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C) <br /> RPM,Inc.,25049 E.Alder Dr.,Aurora,CO 80016 Phone:(303)854-7499 Email:hlhumphries2 dcomcast.net <br /> Climatic Features <br /> Average annual precipitation across the MLRA extent is 14 to 17 inches,and ranges from 13 inches to over 18 inches,depending on location. <br /> The average is 15 inches-Precipitation increases from north to south.Mean Annual Air Temperature(MAAT)is 50°F in the northern part and <br /> increases to 52°F in the southern part.Portions of Morgan and Weld counties(in the northern part)are cooler and drier,the MAAT is 48°F, <br /> and average precipitation is 13 to14 inches per year.Two-thirds of the annual precipitation occurs during the growing season from mid-April to <br /> late September.Snowfall averages 30 inches per year,area-wide,but vanes by location from 20 to 40 inures per year.Winds are estimated <br /> to average 9 miles per hour annually.Daytime winds are generally stronger than at night,and occasional strong storms may bring periods of <br /> high winds with gusts to more than 90 mph.High-intensity afternoon thunderstorms may arise.The average length of the freeze-free period <br /> (28°F)is 155 days from April 30th to October to 3rd The average frost-free period(32°F)is 136 days from May 11th to September 24th.July <br /> is the hottest month,and December and January are the coldest months.Summer temperatures average 90°F and occasionally exceed <br /> 100'F.Summer humidity is low and evaporation is high.Winters are characterized with frequent northerly winds,producing severe cold with <br /> temperatures occasionally dropping to-30°F or lower.Blizzard conditions may form quickly For detailed information,visit the Western <br /> Regional Climate Center website:Western Regional Climate Center>Historical Data>Westem U.S.Climate summaries,NOAA Coop <br /> Stations>Colorado http:llwww.wrcc dri edulsummarylCGmsmco.html Eastern Colorado was strongly affected by extended drought conditions <br /> in the"Dust Bowl"period of the 1930's,with recurrent drought cycles in the 1950s and 1970s Extreme to exceptional drought conditions have <br /> re-visited the area from 2002 to 2012,with brief interludes of near normal to normal precipitation years.Long-term effects of these latest <br /> drought events have yet to be determined.Growth of native cool-season plants begin about April 1 and continue to mid-June.Native warm- <br /> season plants begin growth about May 1 and continue to about August 15.Regrowth of cooFseason plants occur in September in most years, <br /> depending on moisture.Note:The climate described here is based on historic climate station data in the past 30 to 50 years,and is averaged <br /> to provide an overview of annual precipitation,temperatures,and growing season.Future climate is beyond the scope of this document. <br /> However,research to determine the effects of elevated CO2 ardor heating on mixed-grass prairie ecosystems,and how it may relate to <br /> future plant communities(i.e.potential shifts in dominant and subdominant groups,changes in growing season length,responses of cool- <br /> season and warm-season grasses,etc.)is on-going. <br /> Averaged <br /> Frost-free period(days) 129 <br /> Freeze-free period(days) 150 <br /> Mean annual precipitation(inches): 15.89 <br /> Representative Soil Features <br /> The soils on this site are very deep,poorly to somewhat poorly drained soils that formed from alluvium They typically have a slow to <br /> moderately rapid permeability Gass.The available water capacity is typically low,but ranges to moderate.Available water is the portion of <br /> water in a soil that can be readily absorbed by plant roots.This is the amount of water released between the field capacity and the <br /> permanent wilting point.As fineness of texture increases,there is a general increase in available moisture storage from sands to loam and <br /> sift loams.The high levels of salts decreases the available water capacity in these soils.The soil moisture regime is typically aquic,but may <br /> include oxyaquic.The soil temperature regime is mesic. <br /> The surface layer of the sods in this site are typically loam,day loam.or fine sandy loam,but may include Gay or sandy loam.The surface <br /> layer ranges from 4 to 10 inches thick The subsoil,s typically clay,clay loam,or loam,but may include stratified layers with sandy loam. <br /> sand.or coarse sand with varying amounts of rock fragments Rock fragments range from 0 to 35 percent in the undedying material Soils in <br /> this site typically have free carbonates at the surface,tul some soils may be leached from 4 to 10 inches.These soils are saline and <br /> alkaline.The high levels of salinity adversely affects plant species composition and growth.These soils are susceptible to erosion by water <br /> and wind. <br /> Please note,the site soils have been significantly affected by the motocross activities. <br /> Available material was removed for replacement as a plant growth material. We estimate 3 to 4 <br /> inches will be replaced from the on-site plant growth material stockpiles. <br /> 31 <br />