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Permit Amendment - Cemex Sandstone Quarry <br />B -1 Introduction <br />The Cemex Sandstone Quarry property is in the Front Range foothills of Colorado and ranges from 5,350 <br />ft to 5,600 ft in elevation. <br />B -2 Climate <br />The climate is typical for the region with average high and low temperatures in July at 90 *F and 54 °F, <br />respectively, while the average high and low temperatures in December and January are 44 °F and 11 °F, <br />respectively (The Weather Channel 2013). Average precipitation is approximately 16 inches of which the <br />majority is summer rainfall. Average frost -free period lasts from mid -May through early October (Plant Maps <br />2013). Average annual snowfall is approximately 37 inches with the greatest snowfall experienced in <br />February and March (Western Regional Climate Center 2013). <br />Figure B -1: Average Monthly Precipitation* <br />0.5 <br />11 1 <br />JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br />* Data are from Flatiron Reservoir Western Regional Climate Center weather station (Western Regional <br />Climate Center 2013) approximately 10 miles north of the permit area and 100 ft higher in elevation. <br />B -3 Vegetation <br />This elevation in the Front Range foothills is in the vegetation ecotone between the higher elevation <br />ponderosa pine community and the lower elevation plains grassland community. The vegetation at the site <br />is characterized by ponderosa pine forest, oak and mountain mahogany shrublands, and upland grassland <br />communities. <br />B -3.1 Vegetation Communities <br />The vegetation communities described in this permit amendment application are based on field surveys <br />and digital mapping from a 2013 aerial photograph of the site. A summary of each vegetation community's <br />extent is presented in Table B -1 and shown on Figure B -2. <br />Exhibit B B -1 March 2014 <br />2.5 <br />c <br />•- <br />o <br />Z <br />my <br />e <br />All <br />CL <br />Z <br />1.5 <br />a <br />v <br />1 <br />< <br />0.5 <br />11 1 <br />JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC <br />* Data are from Flatiron Reservoir Western Regional Climate Center weather station (Western Regional <br />Climate Center 2013) approximately 10 miles north of the permit area and 100 ft higher in elevation. <br />B -3 Vegetation <br />This elevation in the Front Range foothills is in the vegetation ecotone between the higher elevation <br />ponderosa pine community and the lower elevation plains grassland community. The vegetation at the site <br />is characterized by ponderosa pine forest, oak and mountain mahogany shrublands, and upland grassland <br />communities. <br />B -3.1 Vegetation Communities <br />The vegetation communities described in this permit amendment application are based on field surveys <br />and digital mapping from a 2013 aerial photograph of the site. A summary of each vegetation community's <br />extent is presented in Table B -1 and shown on Figure B -2. <br />Exhibit B B -1 March 2014 <br />