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Attachment 2 - Tables <br /> Table 1 <br /> Brannan Sand and Gravel Company-Morton Lakes Mine <br /> Net Evaporation Rate <br /> 2020 SWSP Amendment and 2021 SWSP Renewal Accounting <br /> Gross Gross Ft Lupton/ Effective Net Net <br /> Evaporation Evaporation Brighton Precipitation Evaporation Evaporation <br /> Distribution Rate Precipitation Rate Rate Rate <br /> Month % (inches) (inches) (inches) (inches) (feet) <br /> [1] [2] [3] [4] [5] [6] <br /> Jun 14.5% 6.42 1.52 1.07 5.35 0.45 <br /> Jul 15.0% 6.64 1.48 1.03 5.61 0.47 <br /> Aug 13.5% 5.98 1.46 1.02 4.96 0.41 <br /> Sep 10.0% 4.43 1.21 0.84 3.58 0.30 <br /> Oct 7.0% 3.10 0.88 0.62 2.48 0.21 <br /> Nov 4.0% 1.77 0.65 0.45 1.32 0.11 <br /> Dec 3.0% 1.33 0.42 0.29 1.03 0.09 <br /> Jan 3.0% 1.33 0.43 0.30 1.03 0.09 <br /> Feb 3.5% 1.55 0.38 0.27 1.28 0.11 <br /> Mar 5.5% 2.44 1.01 0.71 1.73 0.14 <br /> Apr 9.0% 3.98 1.53 1.07 2.91 0.24 <br /> May 12.0% 5.31 2.26 1.58 3.73 0.31 <br /> Total 100.0% 44.27 13.22 9.25 35.02 2.92 <br /> Notes: <br /> [1] SB 89-120 Guidelines monthly distribution of gross evaporation for elevations below 6,500 feet. <br /> [2] Gross evaporation rate equals 44.27 inches(3.69 ft)per year,based upon NOAA NWS 33 Evaporation Atlas. <br /> Monthly distribution given in column[1]. <br /> [3] 1950 to 2014 average precipitation at the Fort Lupton 2 SE(ID:3027,record: 1950-1976)and Brighton 1 NE(ID: <br /> 950,record: 1976-2014)NOAA weather stations. <br /> [4] Effective precipitation rate equals 70%of total precipitation given in column[3]. <br /> [5] Net evaporation rate equals[2]-[4]. <br /> [6] Net evaporation rate in feet equals[5]/12 inches. <br /> BBA <br /> toco�sult nts BISHOP-BROGDEN ASSOCIATES, INC. 9/29/2020 <br />