8327 5TH AVE W 2016-01-01 MF Import

r� Mr. Alan Aramaki Page two �, February 13, 7981 Only one basic soil type was found; this is a glacial fine sandy silt till . The different soil layers shown on the logs represent various states of weathering and loosening by plant roots. The uppermost one ' half to one foot is slightly organic topsoil but retains some of the characteristics of the deeper parent material . Below the trpsoil and extendin9 down to an average �epth of about three feet, the soil is medium brown in color and only slightly affected by weathering and vegetation. 7he deepest soil explored is tan in color and in a con- dition essentially unaltered from the time of its deposition. G No gro�ndwater was observed in any of the test holes and it is un- likely t�at any seepa9e will be noticed during construction. The impervious nature of the soil would prevent rapid groundwater movement. ( •Conclusions and Recommendations So long as no onsite macerials are used in fills to support improve- ments, the soil conditions are well suited to development as your client proposes. Because of the basement beneath the existing house and apparent underground structures including a septic tank and a fuel � tank, it may be recessary to found part of the proposed buildin9s on structural fill ; '.he fill used should consist of well compacted select ag9regate. A11 tc �soil duwn to an average depth of eight-to-ten inches the buildingt3nd pa�kinghareasaandetruckedtoffdthe�sitebe removed from +' s should be poured on undisturbed native soil � � Wherever possible, fo� ,�ng ' aS least six inches bel:w the topsoil and at least 18 inches below finished grade. At isola::�d spots, good judgement and common sense may dictate even deeper excav�`��^' .' case of doubt, the owner or his representative should have me inspect. For those footings wfiich bear on native soil , allowable bearing pressures of 40U0 psf are recomme�ded. H ~: ' � No footing, however, should be less than 14 inches wide. o � Wherever field conditions dictate that areas of structural fill are � � necessary, the footing widths should be doubled. The select granular � F aggregate should be built up from the stripped surface in individually compacted lifts of six-inch maxinum thickness. Each lift should be � F ' � compacted to at least 95 percent of maximum density as defined by the ASTtd D1557 procedure ur to the satisfaction of an inspecting engineer. � F If sr �? of the parking area is to bear on fill , the same general >trippin9 � c a n d itilin g procedure should be foilowed but a less stringent 90 to 95 percent compaction would suffi�e. o Y, � � �, �S '- ". i � � � , ; • � ? �. ; .__..