Laserfiche WebLink
material consists of sandstone, claystone, and mudstone particles with small amounts of fines largely <br />consisting of clay fines with a noticeable amount of carbonaceous material. Refuse and colluvium <br />were tested for geotechnical modeling purposes, as reported in Section 2. Test results were used to <br />establish HELP model input parameters. Soil material types and characteristics used in modeling are <br />identified in Table 3. <br />Land Use <br />The following assumptions for land use were calculated in the HELP model based on soil type, slope, <br />and slope length: <br />• Reclaimed Refuse Pile at 40% Slope- CN =88 for a clay soil material with a fair stand of <br />vegetation and a slope length of 150 -feet <br />• Reclaimed Refuse Pile at 3% Slope- CN =87 for a clay soil material with a fair stand of <br />vegetation and a slope length of 150 -feet <br />• Unreclaimed Refuse Pile at 40% Slope- CN= 97 for compacted refuse pile with no <br />vegetative cover and a slope length of 150 -feet <br />• Unreclaimed Refuse Pile at 3% Slope- CN= 97 for compacted refuse pile with no vegetative <br />cover and a slope length of 150 -feet <br />3.1.2 Model Parameters <br />The refuse pile was modeled for eight different conditions. The conditions that were varied included <br />reclaimed and unreclaimed surface conditions, slope grades for top slope and steep side slope, and <br />refuse thickness depths. The assumed refuse pile design has a maximum refuse thickness of 350 -feet <br />and an average thickness of 130 -feet. The final graded surface has slopes at 40 percent and 3 <br />percent. The slope on the drainage layer is estimated at 54 percent with a slope length of 820 -feet. <br />The reclaimed refuse conditions include a 24- inch -thick cover soils layer and the refuse layer. The <br />unreclaimed refuse conditions include the refuse layer only. <br />The HELP model requires a lateral drainage layer and a barrier layer at the bottom of the fill to <br />calculate drainage that would be collected by an underdrain. To satisfy the model requirements, the <br />lower five feet of refuse was modeled as a lateral drainage layer, and the native colluvium was <br />Revised July 21, 2011 e4s <br />-) LIT 0 <br />PAMpls \06 CO \26106261003 RPE E Permit Mod support \WorkFiles \Permit Application \Text \Exhibit 82 RPEE design 2011 -07 -21 TR 127,doc 13 <br />