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Table 1 <br />Four Corners Materials - Bayfield Gravel Operation <br />Site Specific Evaporation Calculations (elev. 6,750 ft) <br />Years Seven and Eight and Full Build -Out <br />Ground water exposed by mining*: 39.10 acres <br />Gross Evaporation Value: 45 inches <br />Precipitation Value: 16.0 inches <br />Month <br />Monthly <br />Evaporation <br />Distribution <br />Gross <br />Evaporation <br />Average Year <br />Precipitation <br />Effective <br />Precipitation <br />Net Unit <br />Evaporation <br />Net Unit <br />Evaporation <br />Total <br />Evaporation <br />0 of An-n-u-aly-(inches) <br />(inches) <br />(inches) <br />(inches) <br />(feet) <br />(acre-feet) <br />(1) <br />(2) <br />(3) <br />(4) <br />(5) <br />(6) <br />(7) <br />January <br />1.0 <br />0.45 <br />1.48 <br />1.04 <br />0.00 <br />0.00 <br />0.00 <br />February <br />3.0 <br />1.35 <br />1.12 <br />0.78 <br />0.57 <br />0.05 <br />1.85 <br />March <br />6.0 <br />2.70 <br />1.30 <br />0.91 <br />1.79 <br />0.15 <br />5.83 <br />April <br />9.0 <br />4.05 <br />1.04 <br />0.73 <br />3.32 <br />0.28 <br />10.83 <br />May <br />12.5 <br />5.63 <br />1.03 <br />0.72 <br />4.91 <br />0.41 <br />15.98 <br />June <br />15.5 <br />6.98 <br />0.61 <br />0.42 <br />6.55 <br />0.55 <br />21.35 <br />July <br />16.0 <br />7.20 <br />1.61 <br />1.13 <br />6.07 <br />0.51 <br />19.79 <br />August <br />13.0 <br />5.85 <br />1.93 <br />1.35 <br />4.50 <br />0.37 <br />14.66 <br />September <br />11.0 <br />4.95 <br />1.62 <br />1.14 <br />3.81 <br />0.32 <br />12.43 <br />October <br />7.5 <br />3.38 <br />1.71 <br />1.20 <br />2.18 <br />0.18 <br />7.09 <br />November <br />4.0 <br />1.80 <br />1.21 <br />0.85 <br />0.95 <br />0.083.10 <br />December <br />1.5 <br />0.68 <br />1.34 <br />0.94 <br />0.00 <br />0.00 <br />0.00 <br />Annual <br />100 <br />45.00 <br />16.00 <br />11.20 <br />34.65 <br />2.89 <br />112.90 <br />Column Notes <br />(1) From SEO's Guidelines (2/28/95) for sites with elevation above 6,500 ft. <br />(2) Annual value from NOAA Technical Report NWS 33 (source Aquamap, http://water.state.co.us/pubs/aquamap.asp). <br />(3) Contour of precipitation through study site (source Aquamap, http://water.state.co.us/pubs/aquamap.asp). <br />(4) Equals Column 3 x 0.70. <br />(5) Column 2 - Column 4. <br />(6) Column 5 / 12 inches per foot. <br />(7) Column 6 x number of exposed groundwater surface acres. <br />*Equals the currently permitted surface area of 39.1 acres, permit no. 77713-F, which is greater than the current exposed groundwater area but <br />has been used conservatively and is also the maximum build -out amount. <br />General Note: Values are calculated based on the formulas; numbers shown in this table are rounded to the nearest hundredth. <br />P:\031-007\100- Pine River\Bayfield Facility\SWSP\SWSP Renewal 2015\ <br />Bayfield Pit SWSP 2015 Tables and Appx Wright Water Engineers, Inc. Des by: RKH <br />Table 1 Evap March 2015 Ckd by: PRF <br />