Laserfiche WebLink
eh ESPEY. HUSTON & ASSOCIATES, INC. <br />• <br />after placement of the fill aze our interpretation of the likely positions of the <br />potentiometric surfaces based on our experience and on the piezometric data <br />obtained on site. <br />13.3.2.2 Potentiometric Surfaces <br />The water levels after construction of the fill are expected to be higher <br />than those observed in piezometers under preconstruction conditions because <br />potentiometric surfaces often roughly follow surface topography. The increased <br />ground surface elevation due to the addition of the fill may result in an increase in <br />the elevations of the potentiometric surfaces. <br />The soil existing over the bedrock is primarily sand and silt, and is <br />expected to be more permeable than much of the refuse material. This existing soil <br />• <br />is assumed to act as a drainage layer beneath the refuse fill. <br />In only one azea adjacent to the proposed fill were water levels observed <br />to be within five feet of the existing ground surface during the field investigation <br />(piezometer P-3). This area is near the existing creek and proposed drainage <br />improvements aze expected to maintain the water level in this azea at least five <br />feet below existing ground surface. <br />The water levels assumed in the analyses are shown on the Final Refuse <br />Section Stability Model, and the Phase I Refuse Section Stability Model exhibits <br />(Figs. 13.3.2 and 13.3.3). The water levels are assumed to be at least five feet <br />below existing ground surface, for reasons discussed, above, at all points beneath the <br />fill. <br />13.3.33 Material Parameters <br />For purposes of analysis, the materials comprising the proposed refuse <br /> <br />13-7 <br />