PERMFILE56512 - Laserfiche WebLink

Home Browse Search

2. Appropriate construction procedures are maintained • I as will be discussed later. ~~ 3. The final, non-[oxic cover is installed as an imper- meable cover to prevent seepage of the direct precipitation in ICI the pile. Prior to construction, all topsoil should be removed from the foundation area and stored for subsequent use. In addi- tion, any materials which could weaken or otherwise adversely influence the foundation should be removed. These include such material (in addition to topsoil) as unusually loose materials, vegetation matter including stumps and roots, and any other perishable or objectionable materials that could re- duce the strength of the foundation. After the topsoil removal, the foundation should be grad- . ~ ed so that no slope exceeds the gradient of 1(v):2.8(h). The ~ entire area should be free-draining and without any local de- ll pressions srherc water could pond or accumulate either i prior to or during the construction of the pile. Waste rock should not be placed directly on ponded water, saturated soil, I ~ snow or ice during construction of the pile. i~ ~, The waste rock should be adequately compacted during con- e struction to insure against spontaneous combustion, to obtain i adequate strength, and to prevent excessive settlements. The material should be spread in uniform layers of not more than 24 inches in loose thickness and then compacted to at least 90 percent of the maximum dry density as determined by the AASHTO'° T99-74 or equivalent test method ("Standard Proctor"). This may be achievable by selectively routing re- fuse haulage equipment over the pile. If the waste rock is too • coarse to allow compaction as a soil, the rock should not be ''American Association of State Highway and Transportation Officials - 31 - I, GE6MYDR0 CONSUIfING, INC.