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<br />' San Luu Project Phase E Raise I Expansion -Final Conatn~clion Report <br />5.2 Extent o[ Liner Placement <br />t The approved amendment discussed expansion of the disposal azea in two phases associated with <br />each embankment raise. <br />1 <br />To reduce the disruption to operations which would be associated with two phases of liner placement <br />during Raise 1 and 2 construction and limit the seaming of liner sections, BMRI elected to line the <br />entire ultimate impoundment area in a single liner campaign during Raise 1 construction (57 acres). <br />' The ultimate area lined is depicted on Figure C-6 in the Permit Amendment, dated September 1989 <br />and Drawing 14719-102. This change was noted in a letter dated September 13, 1993 from Alana <br />Scott, BMRI, to Larry t~ehler, Division. <br />5.3 Subgrade Preparation <br />t In areas where the insitu soil received overlying fill materials, the soil was moisture conditioned to <br />provide a damp workable material and compacted with 3 to 4 passes of a CAT' CP-553 vibrating <br />sheepsfoot compactor. Although no specification for compaction of this material was included in <br />the original Earthwork Technical Specifications, compaction to 95 percent of maximum dry density <br />' determined in accordance with ASTM D-698 was adopted during all constructian. <br />' S.4 Fill Materials <br />1 Surveys for potential borrow sources for construction fill materials were performed prior to the <br />initiation of work. In general, the available borrow sources consist of variable colluvial and alluvial <br />soils which tend to vary in gradation with depth and location. As a result the seazch for suitable <br />' borrow materials was constantly ongoing. A source of silty sandy gravel is also available from the <br />open pit mining activities at the site. Previous material specifications used for construction of Phase <br />' I were tailored to the sources also borrow known to be available at that time. The original Phase <br />II specifications adopted these material specifications; however, revision of some of these <br />specifications was necessary during actual Phase II construction to incorporate borrow materials <br />which were readily available at the site without altering the original intent and function of the <br />facility. These revisions are discussed in detail in the following sections. <br />1 ay 6 sec[ o. - <br /> <br />