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Mr. Max Ramey <br />June 17, 2003 <br />Page I 1 <br />temperahtre case (420°F). (The reduced strength analysis was not completed for the hot <br />temperature case.) <br />The worst-case scenarios in this study cause yielding 113 ft into the roof, while a yielding <br />distance greater than 169 ft into the roof would be required to cause caicern for crown pillar <br />stability for Well 29-24. <br />CONCLUSIONS <br />Modeling results from this study suggest that a mature cavern will maintai^ structural <br />integrity under conditions of temperatures as high as 420°F and pressures ranging from 100 to <br />900 psi. Model results also suggest cavity stability will not be compromised due to pressure <br />cycling. Currently, Well 29-24 is estimated to be within 12% of maturity (as of April 30, 2003). <br />No indications of structural failure have been observed or monitored to the present. Model <br />results are rather conservative considering [hat rock mass strengths used in the model are at 34% <br />to 14% of laboratory values obtained at cool and hot temperatures, respectively, and that a <br />further 20% strength reduction was used to account for possible strength reduction associated <br />with cyclic loadings. <br />Based on the model, there is no reason to believe that exposing Well 29-24 to pressures <br />as low as 100 psi or to temperatures as high as 420°F would compromise the stability of the <br />cavity. <br />Please call if you have any questions or matters for discussion. <br />Sincerely. <br />//~!_ <br />/ M. Y. Hardy Kyle Free <br />Principal Project Engineer <br />MPFI/KF/KLG <br />Attachments(13): Figures I-13 <br />Cc: E. Cooley. American Soda (5 copies w/attachments, 3 unbound) <br />Agapito Associates, Inc. <br />