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M99238GE <br />operations <br />should be moisture conditioned, mixed and proof-rolled <br />prior to placement o`_ the embankment fill. Any loose, low density <br />or pumping areas exposed during the proof rolling operations should <br />be removed and replaced with compacted embankment fill. we should <br />be called to observe the soil materials exposed during the clearing <br />operations to verify the foundation conditions. <br />4.2 Foundation Drain <br />We understand that current design considerations do not include a <br />foundation drain in the proposed embankment areas. Based on this <br />understanding we assessed the slope as though the pond and embank- <br />ment slopes would be saturated for the critical condition. <br />4.3 Seepage <br />It is our understanding based on conversations with the civil <br />engineer that seepage losses of the impounded water are not of <br />significant concern for the design of the pond. <br />4.4 Exterior Embankment Slope and Stability <br />Our analysis of the exterior embankment slope was based on the <br />strength characteristics noted above of the soils likely to be used <br />for the embankment material. Our analysis indicates that an <br />xterior embankment slope of two (2) to one (1) (horizontal to <br />ertical) may be used considering steady state conditions. A <br />minimum calculated factor of safety of 1.5 was used as the steady <br />state criteria. The exterior embankment slope configuration <br />'concept is shown on Figure 9. <br />4.5 Interior Embankment Slope and Stability <br />Our analysis of the interior embankment slope was based on the <br />soil strength characteristics of the soil materials likely to be <br />used as the embankment materials and a maximum depth of water of <br />ten (10) feet. Our analysis indicted an interior embankment slope <br />of two (2) to one (1) may be used considering steady state condi- <br />tions and rapid draw-down conditions. A minimum calculated factor <br />of safety of 1.5 was used as the steady state criteria and a <br />minimum calculated factor of safety of 1.2 was used as the rapid <br />draw-down criteria. <br />We suggest that you consider protecting the upstream embankment <br />slope from erosion by wave or water acting on the slope either by <br /> <br />Lambert ana ~~s,sotiates <br />CONSULiInG GEOTECN nICAL ENGINEERS AND <br />MI'ERIAL TESTING <br />