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Z <br />Stevan L. O'Brian September 26, 2003 <br />Page 5 <br />Suburban Sand and Gravel -Road Runners Rest II Pit (M-79-195) <br />MONTHLY DISTRIBUTION FOR DEPLETION & REPLACEMENT REQUIREMENTS <br />(All Values in Acre-Feet) <br /> <br />Month Unit <br />Evaporation <br />(AF/AC) Depletions Due <br />to EvaporationZ <br />From 19 Acres Operational <br />Losses3 Total <br />Depletions° Required <br />Replacements5 <br />Jan 0.08 1.54 0.15 1.69 1.77 <br />Feb 0.10 1.81 0.15 1.96 2.05 <br />Mar 0.13 2.41 0.27 2.68 2.81 <br />A r 0.23 4.37 0.94 5.31 5.57 <br />Ma 0.30 5.70 1.03 6.73 7.05 <br />Jun 0.43 8.12 1.87 9.99 10.47 <br />Jul 0.44 8.33 1.87 10.20 10.69 <br />Au 0.41 7.73 1.12 8.85 9.28 <br />Se 0.29 5.59 0.94 6.53 6.84 <br />Oct 0.20 3.79 0.74 4.53 4.75 <br />Nov 0.10 1.82 0.15 1.97 2.06 <br />Dec 0.07 1.38 0.15 1.53 1.60 <br />Total 2.77 52.59 9.38 61.97 64.96 <br />1) Determined using gross evaporation rate of 44 inches from NOAH Technical Report NWS-33. <br />2) Item 1 multiplied by a pond surface area of 19 acres. <br />3) Operational losses include product moisture loss (based on 250,000 tons mined annually) and 2 <br />acre-feet of water used for dust control. <br />4) Sum of items 2 and 3. <br />5) Includes transit loss of 0.5% per mile and a distance of 9.2 miles from the Metro Wastewater plant <br />outfall to the pit site. <br />