729 100TH ST SE 2018-01-02 MF Import

�S'� . Ya�e Four The peaty muck deposit is expected to extenQ. under the proposed building �ite as extrapolated on the attached f;eneralized croes aections, and probably underlies eoils below the 581 foot con- tour to a point estimated to be 35 feet north of thP proposed southeast building corner. Overlying the peaty muck depoeit in places, uncontrolled fill was observed and logged. Foth these materiala r,ould be subfect- ed to eignificant differential and total aettlemente vrhich could be detrimental to performance of the atructure. Thus it is recom �ended to over excavate the propoeed building are�e ar�d access drivev�ays to remove the peai;, Backfill to above wF.ter table should be clean gravel or quarry spalle of eix inct minus rock having little or no fine fraction. Thia materia] requires no compactive effort. The e�xcavation should be a mit�imum of four feet wider on all sidee than the anticipa- ted foo•ting locationn. The backfill materiel, as described above, sh.ould be placed ae soon ae pocsible after e�cavation to pz•eclude th� buildup of excess vrater end water loosened materials. D�ie to the presence of thie water, conventional compaction of a i'ine grained mater- ial inetead of the recommended backfill vroul2 be impoesible. Upon completion of the bacicfill, a normal spr�ead footing design may be used with an allowable soil bearing ce�pacity of 1,500 P.S,F. Alternative methode include the use of pil� foundations� or surchargin� with fill exceedin� the weifht of the building through a dry aeason prior to construction o.f shallow spread footin�;s, If the surcharge method ie to be used, the fill should be placed beginning at the ed�ea of the peaty muck depoeit, and spread tovaard the southeast to rol.l the mobile fractions away from the propoaed building site, Upon conpletion of the surcha- rge, a shallow spread footing design may be used with en allov�- able soil bearine canacity of 1,000 P.S.F. Additional Con.ments � The sandy loam and loamy sand eoils encounterec� below ttie top- coils and above the weathered till layer he.ve �ood compactive qualities, and may be uti].ized as strveturF�l fill when corapact- ed at the proper moiRture content. If the recoremended over excavation method is to be used, a aed- ' imentation control far.ility will have to be engineered, The conclusione and recommendations pres�nted herein are pro- fessional epinions. These op9nions are based on generally acc- epted soil.a en�ineering principlea and prnctice, and no v�arrant is e>�presced or frr�plied. EA.9T!/ AMILYS/S