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� � <br /> (�eotechnical Engineering Report <br /> Prorosed Ahn Warehouse <br /> h1uv I1, 2001 <br /> CG File No. I I21 <br /> Page 8 <br /> test is very important te evaluate the existing fill and how it will perform if left in place. If[he <br /> existing fill is Ieft in place and the proof-roll test is adequate, Ihere w�ll always be nsk of long <br /> term setdement, �h�ch may appear as pavement disness or cracks. We should be retained to <br /> obsen�e the proof roll prior to placement of the asphalt or hard surfaces and comment on the <br /> future ricks. <br /> 7'he site soils are considereci poorly draining and will tend to pond water. Therefore, a drainage <br /> layer under the asphalt is very important for the performance of the pavement. <br /> We recommend that a paveinent section consisting of 6 inches of crushed rock be overlain by 2 <br /> inches of Class B Asphalt be placed on the prepared sub grade. This pavement c:esign is based on <br /> less than 10 trucks per day at[he site. If more than 10 trucks per day are expected or if the trucks <br /> are heavily loaded, we recommend that 3 inches of Class B Asphalt be placed over the 4 inches of <br /> crushed rock. <br /> Temporary and Permanent Slopes <br /> Temporary cut slope stability is a func[ion of many factors, such as the type xnd consistency of <br /> soils, depth of the cut, surcharge loads adjacent to the excavation, length of time a cut remains <br /> open, and the presence of surface or ground water. It is exceedingly difficult under these vanable <br /> conditions to estimate a stable temporary cu[ slope geometry. Therefore, it should be the <br /> responsiblity of the contractor to maintain safe slope configurations, since the contractor is <br /> continuousl��at the job site, able to observe the nature and condition of the cut slopes,and able to <br /> monilor the subsurface materials and ground water conditions encuuntered. <br /> We anticipate temporary cuts for installation of utilities and excavation for th2 dayhght basement. <br /> For planning purposes; �+�e rewmmend that temporary cuts in the existing fill be no steeper than <br /> 15 Ilonzontal to 1.0 Vertical (1.SH:1.OV). Cuts in the dense native soils may stand at a steeper <br /> inclination. If ground water seepage is encountered, we would expect that flatter inclinations <br /> would be necessary. <br /> � � <br /> Cornerstone Geotechnical, Inc. c '�J,�� <br /> � <br />