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(YT(Jn/Vw 1600 Awt A«t, <br /> pONSULTINO ENOiNEFAS Ahoat, Uwz <br /> August 9, 1990 1f"pffewm <br /> °t""mvem 1017 <br /> WASM <br /> San Juan County Mining Venture <br /> Sunnyside Mine <br /> P.O. Boa 177 <br /> Sdverton, CO 81433 <br /> For Attention Mr. Mice Foutz <br /> Re: No. 4 Tani= Pond - Survev Data <br /> Dear Mike: <br /> We have analyzed the recent survey of the No. 4 tailings pond and have reduced the data <br /> on the attached plots. <br /> Within the accuracy of the survey, which has not been stated but is assumed to be within <br /> plus or minus 0.02 ft., the movements do not indicate any particular adverse trend and the <br /> vertical settlement velocity has reduced between 6/14/90 and 3/14/90,showing a positive <br /> trend <br /> The maximum vertical settlement of 0.2 ft. is not excessive for an upstream constructed <br /> embankment. <br /> We recommend that quarterly surveys of the facility continue to be taken. <br /> Sincerely, <br /> Donald R. East, P.E. <br /> Partner <br /> DRE:gp <br /> Attachments <br /> MEMBER OF <br /> " AMERICAN CONSULTING <br /> ENGINEERS COUNCIL <br />