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a <br />- Boettcher Mine Acreage Release Request ~ - - - ~ - - <br />_ - -_ October-17,2005 -_ - ~ ~ ~ ~ - - - - - ~-~ - ~ - - - <br />' Pdge 2 oj2 <br />much as possible. A road- base material available on-site is' largely."made up -of angular- <br />, ' - 3/a" rock with smaller. rock- and fnes: It is, proposed that the material be used as a <br />substitute for UDFCD Type I "and Type; II bedding. The material will be placed along the <br />graded.slope to a depth of 4 - 8 inches. Under the-site conditions, the proposed bedding <br />' material will- effectively. assist in preventing the removal of the. fine material from <br />.. underneath the riprap. _ <br />It is also proposed -that additional rock- available on-site be used as riprap protection for <br />the headcut areas. ' The rock is a hard, angular sandstone materiah not native to -the site: <br />Although it is not know if .the rock is equivalent to UDFCD Type M riprap, it is a hazd <br />. and competent material that"will persist in the applied ephemeral drainage conditions. <br />The rock consists of angular pieces from 4 - 16-inches with-some as large as 36 inches. . <br />"The rock will be placed over the bedding material and-cover the-apron area as described <br />in the attached design materials. <br />If you have questions or require additional information, please callme of (303) 452-6611. <br />Sincerely, <br />APPlegate„Group,~incF !' <br />it // / <br />/jJ , <br />William Schenderlein; P:E. <br />Project Engineer <br />cc: Gordon, Benton, Holcim (US) Inc. - , <br />AGFile #02-199. <br /> <br />