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Table 2 <br />Four Corners Materials - Bayfield Gravel Operation <br />Site Specific Evaporation Calculations (elev. 6750 ft) <br />Year Three and Four <br />Ground water exposed by mining *: 28.39 acres <br />Gross Evaporation Value: 45 inches <br />Precipitation Value: 16.0 inches <br />July <br />January <br />February <br />March <br />April <br />May <br />June <br />August <br />September <br />October <br />November <br />1.0 <br />3.0 <br />6.0 <br />9.0 <br />12.5 <br />15.5 <br />16.0 <br />13.0 <br />11.0 <br />7.5 <br />4.0 <br />December 1.5 <br />lemiri nhual- 11111111111100$00/10( <br />0.45 <br />1.35 <br />2.70 <br />4.05 <br />5.63 <br />6.98 <br />7.20 <br />5.85 <br />4.95 <br />3.38 <br />1.80 <br />0.68 <br />1.04 <br />0.73 <br />1.48 <br />1.04 <br />1.12 <br />0.78 <br />1.30 <br />0.91 <br />1.03 1 0.72 <br />0.61 1 0.42 <br />1.61 1 1.13 <br />1.93 1 1.35 <br />1.62 1 1.14 <br />1.71 1 1.20 <br />1.21 1 0.85 <br />1.34 1 0.94 <br />0.00 <br />0.57 <br />1.79 <br />3.32 <br />4.91 <br />6.55 <br />6.07 <br />0.00 <br />5100111/11111111011111111610011114111 1iM0 l 34165 <br />0.00 <br />0.05 <br />0.15 <br />0.28 <br />0.41 <br />0.55 <br />0.51 <br />4.50 <br />0.37 <br />2.18 <br />0.18 <br />3.81 <br />0.32 <br />0.95 <br />0.08 <br />0.00 <br />(P7) <br />acre -feet) <br />0.00 <br />1.34 <br />4.23 <br />7.86 <br />11.61 <br />15.50 <br />14.37 <br />10.64 <br />9.03 <br />5.15 <br />2.25 <br />0.00 <br />82:0 <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 <br />(7) Column (6) x number of exposed groundwater surface acres. <br />*equals the currently permitted surface area of 28.39 acres, permit no. 63606 -F. <br />P:W31- 007100 - Pine RlverlBayfield FacilityySWSP\SWSP Renewal 20111Red Dot\ Wright Water Engineers, Inc. <br />Bayfield PiT SWSP Tables vier Feb 17 2011\Tabie 2 Evap Year 3 March 2011 <br />Des by. BAP <br />Ckd by PRF <br />