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M98177GE <br />Surface water should not be allowed to cascade over the face of <br />any cut or fill slopes. Cut and fill slopes should be constructed <br />with surface diversion ditches at the top and possibly also at the <br />mid slope to intercept surface water and divert it off of and away <br />from the slopes. The surface drain ditch concept is presented on <br />Figure 5. <br />The face of the slope should be contoured and tailored to promote <br />rapid runoff of surface water. Surface water should not be allowed <br />to pond or puddle on the face of or in the vicinity of any slope. <br />Slopes faces should be protected from erosion by vegetation or <br />other appropriate erosion protection methods. <br />6.0 FOUNDATION RECOMMENDATIONS <br />Geotechnical engineering considerations which influence the <br />foundation design and construction recommendations presented below <br />are discussed in Appendix C. <br />6.1 Truck Loadout Surge Bin <br />i We have analyzed drilled piers and spread footings as potential <br />foundation systems for the proposed truck load out surge bin <br />structure. These are discussed below. We are available to discuss <br />other foundation types. <br />we recommend that the entire structure be supported on only one <br />foundation type. Combining foundation types will result in differ- <br />ential and unpredictable foundation performance between the varying <br />i foundation types. <br />i All of the design parameters presented below are based on tech- <br />niques performed by an experienced contractor, high quality crafts- <br />manship, care during construction and post construction cognizance <br />of the potential soil volume change hazard, with appropriate post <br />construction maintenance. The spread footing recommendations <br />include recommended design and construction techniques to reduce <br />the influence of volume changes of soil materials supporting the <br />foundation but should not be interpreted as solutions for complete- <br />ly mitigating the potential for movement from volume changes of <br />~ soil material supporting footings. <br />6.1.1 Drilled Piers, Truck Loadout Surge Bin <br />Drilled piers or caissons that are drilled into stiff clay <br />material may be used to support the proposed structure. The piers <br />9 <br />~Lam6ert ana ~.~,~oriate~ <br />GONSULnND GEOTECNNIGL ENGINEERS wND <br />MATE RIAL TESTING <br />