2232 12TH ST 2016-01-01 MF Import

, Everett C.anci Association E-2554 Fel�ruary 2?, 1y85 P�ye 3 . infi_ 1Cratin�; � he sur(ac�� snils rn��„int �:�rs a r��l .3r_ iveiy iripenneable � glacia]. ly c��n5�lidateu soil. Thi� uroundwa�er seep,aye level is not static, thus one may expect ( J.uctuaci�ns in the level dapen�ing on the amounC ��f rainfall , surface �a,iter runoff, am-1 nCher fact��rs. ��enerally the water levul is hiqhec- in ttie wecl��r winter mon�hs . � UISCUSSION AND RECpMMENDAI'IONS General As previously aescribed, tho� yrouna s�rEace is yenerally underlain by silts above dense, ylacially consolidated soils. Shallow fi11 soils exist in the northeast ,�ortion of tne site. To provide aaequate sup�:ort, the pro,�r�sed buildinys may b�; supportec� on conventional continuous and individual spread f.00tinys beariny on native soils or on structural fill place�� abc�va native soils. An allowable beariny ca��acity of Cwo chou,:�n�i five hundred ( 250U ) pounds per square foot (psf ) may be used for footinys beariny on native silts or on structural till. An allowable bearing capacity of four thoueand (4000) psf may be used for footings b�nring on dense, giacially consolioated till and hard silts . Slabs-orgrade and pavement areas may be supported on native soils, or on at least one foot of. structur3l Eill placed above existing fill soils. Moisture contents of on-site soils encountered during our exploration were greater than the optimum moisture content and the soiis contain appreciable fines . It is our e�;perience that grading will be difficult if c�m ducted dur.ing wet weather and it Would probably be necessary to im��ort clean, granular fill from an outside source. If. constr.uction is performe�i duriny dry weatiier, it is possible that the on-siCe soils may be dried by aaration thus becominy suitable for us�; as structural fill. In addition, if constr�ction takes place in the rainy se:ason, we suggest that six inches of clean yi-avel be placed under the foo[inys to protect the beariny surface . Foundat:ons The propos�d sCructure may be supported on conventional conCi- nuous and spread footinys beariny on the native soil or on strucCural fill placed above , competent native soils. Uverexcavation of soil below the f.00tiny may be reyuired in exi�ring fill areas depending on final site grades. Fill placeci under footings should extend outwards from the edge uf the footings at least a distance equal to the depth of fili . Exterior footinys should be bortomed at a minimum depth of Lwelve ( 12 ) inches below the lowest adjacent outside finish yrade. Interior f�otinys may be at a depth o` twelve ( 12) inches below the top of Eanh Consultants, Inc.