Laserfiche WebLink
. 1 <br /> � � , � <br /> . .�ID L. NELSON AND ASSOCU7E5, INC. � <br /> � Consulting Engineering Geolo�y <br /> AprTl 7, 1989 <br /> ProJect No. 3989 <br /> � Page 5 <br /> � Materiels: <br /> Structurel fill should tonsist of a good quality free-dralning granular soil, <br /> � free of organics and other deleterious material , and be we11 graded to a <br /> maximum si2e of ahout 3 inches. imported, all weather fill should contain �o <br /> more that about 5Z fines (soil finer that a U.S. No. 200 sieve). <br /> � <br /> Fill Placement: <br /> � Following subgrade preparation, placement of the structural fi11 may proceed. <br /> All backf111ing should be eccomplished in 6 to 8 inch thick uniform 11fts. <br /> � Each lift should be spread evenly and be thoroughly compacted prior to <br /> p)acement o! subsequent lifts. A m?nlmum relative compaction of 95� (ASTM D- <br /> � 1557) should be achieved for all �tructural fill underlying the building <br /> area. Minimum values of 90� (ASTM D-1557) sh�uld be achieved for filis <br /> beneath sidewalks, and pavements. The moisture content of the so11s to be <br /> ' compacted should be within about 2� of optlmum so that a readily compactable <br /> condition exists. Compaction and moisture content criteria should be <br /> � established by the moisture-density relationship curve, ASTM 0- 1557 (modified <br /> proctor). All compaction should be accomplished by equlpment of a type and <br /> ' slze sufficient of attain the desired degree of compaction. <br /> I Embankments: <br /> Permanent fil� embankments are expected to stand at various slopes depending <br /> on the material and compaction effort used. For structural fill , that is f111 <br /> � comprised of clean imported or on slte soils with a reiative compaction in <br /> excess of 90� (ASTM D-1557), emDankment slopes should be no steeper than <br /> � 2H:1V. 7his criteria applles to the sloping of structural fill beyond the <br /> horizontal extension margin for the building site. <br /> Foundations <br /> In our opinion, the use of shallow spread or continuous footings founded in <br /> the prepared structural fill soils should prove suitable for suppart of ihe <br /> proposed dwelling. Bottom of footing elevation should De established at <br /> depths below grade no deeper than 2 feet above the hlghest perched water level <br />