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GEOSY EC CONSULTANTS Page 7, . <br />Written by: M. Minch Date: 99/ 9 / 29 Reviewed by: Date: ✓.i / to / %O <br />W MM DD YY MM DD <br />Client: Allied Waste Project: Forward Proj. No. WS0264 Task No. 2 <br />Landfill Settlement Estimate <br />Secondary compression of the landfill was estimated based on the following equation: <br />Ss=HCa'I09(t2/t1) (Sowers, 1983 "Settlement of Waste Disposal Fills." <br />Proceedings of the 8th International Conference of Soil <br />Mechanics and Foundation Engineering, Moscow) <br />Assume Ca = 0.025 (Average of 0.01 and 0.04 from Oweis and Khera, 1990) <br />Assume two layers: <br />75 feet of MSW placed from 1999 to 2001 - assume t0=2000 <br />65 feet of MSW placed from 1978 to 1988 - assume t0=1 983 <br />Compute Secondary compression from 2002 to 2031 <br />o Ole - <br />J <br />L �.- ✓'l4rt <br />� d L&t60- <br />F**OD <br />C <br />Notes: [1] Percent of the total secondary compressi expected during the <br />30 year post -closure care period. <br />S condary Com ression(fft) <br />Percent <br />Top <br />Bottom <br />Cumulative <br />Year <br />Layer <br />Layer <br />Total <br />Total <br />Complete <br />2002 <br />0.564 <br />0.038 <br />0.603 <br />0.603 <br />17% <br />2003 <br />10.330 <br />0.036 <br />0.366 <br />0.969 <br />28% <br />2004 <br />0.234 <br />0.034 <br />0.269 <br />1.238 <br />35% <br />2005 <br />0.182 <br />0.033 <br />0.215 <br />1.452 <br />42% <br />2006 <br />0.148 <br />0.031 <br />0.180 <br />1.632 <br />47% <br />2007 <br />0.126 <br />0.030 <br />0.156 <br />1.788 <br />51% <br />2008 <br />0.109 <br />0.029 <br />0.138 <br />1.925 <br />55% <br />2009 <br />0.096 <br />0.028 <br />0.124 <br />2.049 <br />59% <br />2010 <br />0.086 <br />0.027 <br />0.112 <br />2.161 <br />62% <br />2011 <br />0.078 <br />0.026 <br />0.103 <br />2.264 <br />65% <br />2012 <br />0.071 <br />0.025 <br />0.096 <br />2.360 <br />68% <br />2013 <br />0.065 <br />0.024 <br />0.089 <br />2.449 <br />70% <br />2014 <br />0.060 <br />0.023 <br />0.083 <br />2.533 <br />73% <br />2015 <br />0.056 <br />0.022 <br />0.079 <br />2.611 <br />75% <br />2016 <br />0.053 <br />0.022 <br />0.074 <br />2.685 <br />77% <br />2017 <br />0.049 <br />0.021 <br />0.070 <br />2.756 <br />79% <br />2018 <br />0.047 <br />0.020 <br />0.067 <br />2.823 <br />81% <br />2019 <br />0.044 <br />0.020 <br />0.064 <br />2.887 <br />83% <br />2020 <br />0.042 <br />0.019 <br />0.061 <br />2.948 <br />85% <br />2021 <br />0.040 <br />0.019 <br />0.059 <br />3.006 <br />86% <br />2022 <br />0.038 <br />0.018 <br />0.056 <br />3.063 <br />88% <br />2023 <br />0.036 <br />0.018 <br />0.054 <br />3.117 <br />89% <br />2024 <br />0.035 <br />0.017 <br />0.052 <br />3.169 <br />91% <br />2025 <br />0.033 <br />0.017 <br />0.050 <br />3.219 <br />92% <br />2026 <br />0.032 <br />0.017 <br />0.049 <br />3.268 <br />94% <br />2027 <br />0.031 <br />0.016 <br />0.047 <br />3.315 <br />95% <br />2028 <br />0.030 <br />0.016 <br />0.045 <br />3.360 <br />96% <br />2029 <br />0.029 <br />0.016 <br />0.044 <br />3.404 <br />98% <br />2030 <br />0.028 <br />0.015 <br />0.043 <br />3.447 <br />99% <br />2031 <br />0.027 <br />0.015 <br />0.042 <br />1 3.489 <br />100% <br />Notes: [1] Percent of the total secondary compressi expected during the <br />30 year post -closure care period. <br />