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Stream Depletion Factor = <br />Stream. Depletion Analysis Using Stream Depletion Factors <br />Lafarge West, Inc. <br />Rich Pit, M -85 -218 <br />Mining Stream Depletions - <br />Freshwater Pond at Old Aggregate Sales Area Unused Wash Pond <br />120 days <br />3/3/11 <br />Applegate <br />;' Group. <br />Cumulative <br />Time <br />(months) <br />1 <br />2 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />11 <br />12 <br />13 <br />14 <br />15 <br />16 <br />17 <br />18 <br />19 <br />20 <br />21 <br />22 <br />23 <br />24 <br />25 <br />26 <br />27 <br />28 <br />29 <br />30 <br />31 <br />32 <br />33 <br />34 <br />35 <br />36 <br />37 <br />38 <br />39 <br />40 <br />41 <br />42 <br />43 <br />44 <br />45 <br />46 <br />47 <br />48 <br />Month <br />Apr -08 <br />May-08 <br />Jun -08 <br />Jul -08 <br />Aug -08 <br />Sep -08 <br />Oct -08 <br />Nov -08 <br />Dec -08 <br />Jan-09 <br />Feb -09 <br />Mar-09 <br />Apr -09 <br />May -09 <br />Jun -09 <br />Jul -09 <br />Aug -09 <br />Sep-09 <br />Oct -09 <br />Nov -09 <br />Dec -09 <br />Jan-10 <br />Feb -10 <br />Mar-10 <br />Apr -10 <br />May -10 <br />Jun -10 <br />Jul -10 <br />Aug -10 <br />Sep-I0 <br />Oct -10 <br />Nov -10 <br />Dec -10 <br />Jan-11 <br />Feb -11 <br />Mar-11 <br />Apr -11 <br />May -11 <br />Jun -11 <br />Jul -11 <br />Aug -11 <br />Sep-11 <br />Oct -11 <br />Nov -11 <br />Dec -11 <br />Jan-12 <br />Feb-12 <br />Mar-12 <br />Consumed <br />Volume <br />Pumped <br />(ac -ft) <br />0.15 <br />0.21 <br />0.26 <br />0.26 <br />0.22 <br />0.18 <br />0.12 <br />0.07 <br />0.05 <br />0.05 <br />0.06 <br />0.09 <br />0.15 <br />0.21 <br />0.26 <br />0.26 <br />0.22 <br />0.18 <br />0.12 <br />0.07 <br />0.05 <br />0.05 <br />0.06 <br />0.09 <br />0.15 <br />0.21 <br />0.26 <br />0.26 <br />0.22 <br />0.18 <br />0.12 <br />0.07 <br />0.05 <br />0.05 <br />0.06 <br />0.09 <br />0.15 <br />0.21 <br />0.26 <br />0.26 <br />0.22 <br />0.18 <br />0.12 <br />0.07 <br />0.05 <br />0.05 <br />0.06 <br />0.09 <br />Cumulative <br />Volume <br />Pumped <br />(ac -ft) <br />0.152 <br />0.359 <br />0.621 <br />0.877 <br />1.098 <br />1.282 <br />1.406 <br />1.474 <br />1.526 <br />1.580 <br />1.644 <br />1.733 <br />1.885 <br />2.092 <br />2.354 <br />2.611 <br />2.831 <br />3.015 <br />3.139 <br />3.207 <br />3.260 <br />3.313 <br />3.377 <br />3.467 <br />3.618 <br />3.825 <br />4.087 <br />4.344 <br />4.564 <br />4.748 <br />4.872 <br />4.941 <br />4.993 <br />5.046 <br />5.110 <br />5.200 <br />5.352 <br />5.559 <br />5.821 <br />6.077 <br />6.298 <br />6.482 <br />6.606 <br />6.674 <br />6.726 <br />6.780 <br />6.844 <br />6.933 <br />Cumulative <br />Volume of <br />Depletion <br />(ac -ft) <br />0.009 <br />0.050 <br />0.123 <br />0.226 <br />0.345 <br />0.468 <br />0.586 <br />0.689 <br />0.776 <br />0.849 <br />0.915 <br />0.980 <br />1.052 <br />1.140 <br />1.250 <br />1.382 <br />1.527 <br />1.672 <br />1.810 <br />1.931 <br />2.033 <br />2.120 <br />2.199 <br />2.276 <br />2.358 <br />2.456 <br />2.576 <br />2.717 <br />2.870 <br />3.023 <br />3.168 <br />3.296 <br />3.404 <br />3.498 <br />3.583 <br />3.665 <br />3.753 <br />3.856 <br />3.980 <br />4.127 <br />4.284 <br />4.441 <br />4.590 <br />4.722 <br />4.834 <br />4.931 <br />5.020 <br />5.106 <br />Volume of <br />Depletion <br />This Step <br />(ac -ft) <br />0.0088 <br />0.0408 <br />0.0734 <br />0.1025 <br />0.1190 <br />0.1231 <br />0.1180 <br />0.1038 <br />0.0863 <br />0.0734 <br />0.0663 <br />0.0649 <br />0.0713 <br />0.0879 <br />0.1102 <br />0.1327 <br />0.1446 <br />0.1452 <br />0.1375 <br />0.1211 <br />0.1019 <br />0.0875 <br />0.0792 <br />0.0767 <br />0.0823 <br />0.0981 <br />0.1196 <br />0.1414 <br />0.1528 <br />0.1529 <br />0.1447 <br />0.1280 <br />0.1084 <br />0.0937 <br />0.0850 <br />0.0823 <br />0.0876 <br />0.1031 <br />0.1244 <br />0.1461 <br />0.1573 <br />0.1572 <br />0.1488 <br />0.1320 <br />0.1122 <br />0.0974 <br />0.0886 <br />0.0857 <br />Volume of <br />Stream <br />Depletions <br />(ac -ft) <br />Year 1 <br />0.98 <br />Year 2 <br />1.30 <br />Year 3 <br />1.39 <br />Year 4 <br />1.44 <br />Steady state <br />0.1116 <br />0.1278 <br />0.1501 <br />0.1728 <br />0.1844 <br />0.1840 <br />0.1749 <br />0.1567 <br />0.1354 <br />0.1194 <br />0.1098 <br />0.1065 <br />Year 2 <br />1.73 <br />Rich Pit Unused Wash Pond <br />page 1 of 1 <br />