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11 ' <br /> � rf. . <br /> Mr. Richard Sullivan <br /> � July 25, 1981 <br /> � Page 2 <br /> a '"� <br /> ��w <br /> N � On Mukilte�o Boulevard at the intersection with Ridgemont Drive north of the <br /> � � subject p. �oerty is a sand pit. Exposeo in this pit is a tan, dense to fine <br /> O pC o to medi ur ;and. <br /> � N H <br /> No in�ications of springs or aroimdwater were observ=d on the subject property <br /> � x� or in the ezposur=s. No water .�as flowina in the rav`.ne bottom at the times <br /> ,� d of my visit but may fl ow intermittently during the rairy szason. <br /> O i-+ <br /> �+ t'�� g The siope of nosz of th? property, with the exception of :he extrene eastern <br /> Q` � the soils <br /> zH edge, is 1 vertir_al on 2 hori�ontal (1Y on 2H) . Considerir�g <br /> y y obszrved in the exposures, it is my opinion that these slope_ may be locally <br /> t' oversteepened by ex.cavation to provide driveways and residence founAations. <br /> � Finished excavated slopes of not steeper than i`! on 1 .5H are re�sonable. <br /> �� Slopes ste�per than Lhis will require support by a retaining structure. <br /> H� Filis may be pianned on the 14 on 2H hillside pr�vided topsoil and loose upper <br /> O t�o soils, probably to an averaae depth of 2 feet, are stripped and fill placed in <br /> horizontal layers, :ompacted, and bonded to the hillside. i3onding is achieved <br /> � by cutti�g into the hillside with a dozer blade as each layer is placed, thus • <br /> providing a series of alt2rnating bench2s and vertical cuts beneath the `ill . <br /> All grading and site preparaCion work must be performed during the dry sur.��er <br /> ' months. Fiil mzteriai probabl! will require wettina or drying to achieve <br /> �� satisfactory compaction. Al1 compacted fills should be observed and test2d by <br /> 1 a geetechni :al engineer or hi : representative. <br /> Cut slooes as si=ep as 1V on ? .SH may be used. These slopes must be protected <br /> against erosion. Slopes steeaer than 1V on 1 .SH will require a retaining <br /> '� �� structure. <br /> � Residences may be sited or the ridaes or on the slopes. Foundatiors on 1'J on <br /> � � 2H slopes may consi;t of stepped footing rralls generally oriented normal and <br /> I � ��� parallel to the contour. Footings buried a minimum of 2 feet probably will be <br /> needed :o reach throuoh surficial loose soils. 9elow ground livina space <br /> ;hould be protected from water seepage by a footing drain, clean sand and <br /> .., gravel wa� l backfill to within 18 inches o` around surface, and a water <br /> ��� � repellent treatment on the outside of the wall . <br /> Residences may be 2levated above the ground sur`ace, such as a poie house or � <br /> � house on piers. Piers or poles should be rein`orced and imbedded helow the <br /> ���� ground sur`ace a d=pth su"ic�ent to resist downslope soil cr2ep, ?robabl,• a <br /> minimum o` six Peet. <br /> 5 <br /> ;' <br /> i 51�' <br /> � '.yE�ebn <br /> i': ' <br /> t r '�y iY <br /> - :. �� �r �� ��t � <br />