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The referenced reports also indicate that angles of internal friction ((�V) of between <br />33.5° and '14' have been used in various analyses Im {framed collditions. However, Ille <br />maJority of the analyses used a value of 34 °. <br />Based upon the available data, the following parameters were utilized for the <br />compacted gob. <br />® � = 104.6 pef <br />® c' = 0 psf <br />�' = 34° <br />Mat ye Foun(lation Soils <br />In general, the soil parameters utilized for the native foundation soils have been <br />fairly consistent within the reviewed documentation. As a result, based upon the <br />available data, the following parameters were utilized for the native foundation soils. <br />• y — 125 pcf <br />• c' = 100 psf <br />0 �' = 34° <br />Cover ill <br />Based upon information provided to HBET, the coverfill consists of native <br />overburden soils. As indicated above, the in -place native soils have a moist unit weight <br />of 125 pef. However, the in -place native soils are anticipated to generally be normally <br />consolidated. The coverfill stockpiles will not be compacted and as a result, a lower unit <br />weight is likely. The following parameter was utilized for the coverfill soils. <br />® y= 115 pef <br />3.3 Piezoinetiric Surface <br />In general, based upon our review of the available data, HBET does not believe <br />that there is a free water surface, such as a static groundwater table, within the gob pile. <br />However, the pore pressures recorded by the vibrating wire piezometers are not zero. As <br />a result, the pore pressure data from the piezometers was used to generate a piezometric <br />surface consistent with that data in order to evaluate the impacts of the pore pressures on <br />the stability of the gob, HBET utilized data from VWP -05, VWP -06, and VWP -08 to <br />generate the piezometric surface. It is important to note that VWP -10 is closer to the <br />Cross section lines and is at a similar elevation to VWP -05; however, the pore pressures <br />in VWP -10 are negative. Therefore, the use of the VWP -05 data is conservative. <br />Beyond the limits of the available piezometer data, HBET assumed a phreatic <br />surface for the area of gob pile ##2 below VWP -05. Beyond tile toe, the ph- reatic surface <br />was assumed to intersect and follow the ground surface. This is a conservative <br />assumption. <br />\'2003 ALL PROJECTS 01 349 -uw,ie Mwrtc:. LLC O1349 -001 Bimie Mme`300 • Geo'.Gob 3- Cotitr$ll Stability 01349 -6,491 R091914 doe 3 <br />