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`z <br /> •.,e <br /> i <br /> ,`� <br /> �� <br /> I i� <br /> t,. � �. �-`�� <br /> . � . . ��.7i�' <br /> i <br /> . ' _ I •1`vf , <br /> CASCADE GEOTECHNICAL I `:`;G <br /> December 2 , 19II7 ' �'�'� <br /> I �"' <br /> Job No. 8711-20G ;� <br /> Seattle Mortgage ; <br /> Page 5 <br /> The slab suhgrade may be undisturbed native soil or structural <br /> fill which has been placed on undisturhed native soil , free of <br /> organic material . <br /> Structural Fill <br /> If stcuctural fi11 is required to obtain desired grade�� , we recom- <br /> mend that the fill material be placed on a base of firm, native <br /> soil. in eight ( B ) inch loose lif.ts and compacted to 95,� of the ASTM <br /> D-7557 maximum dry density value under structures and to 90g of the <br /> maximum dry density value under paved areas. I <br /> i <br /> -'�. <br /> If fill is to be used ��nder the footinqs, a bearing value of 2000 ' 1� <br /> p,s . f . may be used for fill placed in the above mentioned manner . I <br /> We recommend against placing footings partially upon structural , <br /> fill and partially upon native soil . ' <br /> The native, gray-brown silty sand with some gravel and gray silty <br /> sand with gravel appear suitable for use as structural fill if they � <br /> are free of organic material and the moisture content of the fill <br /> soil is carefully contro.11ed. <br /> If fi!.1 is required on a wet subgrade or during wet weather , we <br /> recommend that the fill soil conform to the following gradation for <br /> an all weather fill. <br /> Sieve Size Pe�rc:ent Passinq <br /> 4 inch 100 <br /> #4 25 — 75 <br /> #200 5 .0 maximum. eas?d <br /> on the fraction pass- <br /> ing the #4 sieve. <br />