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JO& <br />•R ENGINEERING <br />• Foundations: Shallow conventional isolated or continuous spread footings could be supported <br />on properly compacted structural fill placed directly over the dense Vashon Till deposits or on <br />the undisturbed dense Vashon Till deposits using a maximum allowable pressure of 2,500 psf or <br />3,000 psf, respectively. <br />• Floors: Soil -supported slab -on -grade floors can be used for the proposed structures contingent <br />on proper subgrade preparation. The concrete slab would need to be supported on capillary <br />break material overlyingfrm, unyielding native soils or on suitable structural fill soils. <br />• On -site Soil Considerations: Most of the on -site soils are highly moisture -sensitive and would be <br />readily disturbed when wet, the contractor should install appropriate temporary drainage <br />systems at the construction site and should minimize traffic over exposed subgrades. Ideally, <br />earthwork would be scheduled for the summer and fall months, when drier weather will <br />maximize the potential for reusing on -site soils and when groundwater levels will likely at their <br />seasonal low. <br />MP ENGINEERING, PLLC MPGEOTECH.COM <br />