11020 19TH AVE SE BARTELL DRUGS 2016-01-01 MF Import

i f ' � ' Subsurface Erplorarion and Silvcr Lake�1(nll Bnrtcl!Drug Store Geotethnirn!Enginecring Reporr Everett, R'nshii!etnn DesiRn Rccon:mendations IrVl footing areas should be inspected by ALSI prior to placing concrete to verify that the rock trenches and natural soil bearing surfaces are undisturbed and construction conforms to [he ( recommendations contained in this report. Sucl� inspections may be required by the governine municipaliry. Ferimerer footing drains should be provided as discussed under the section on � Drui��age Coitsitlerntlo�ts. [t should bc noted that dte area bounded by lines extending downward at IIL•1V fr� n �ny I footing must not intersect another footing or intersect a filled area which has not becn compacted to at least 95 percent of ASTM:D 1�57. In addition, a 1.51{:iV line estending down from any footing must not daylight because slou��hing or raveling may eventu�lly � undennine the footim�. Thus, footi;igs should not he placed ncar the edge of steps or cuts in thc bcaring soils. � 9.0 PLOOR SUPPOR"I' I A slab-on-grade �loor may be used over structural fill or pre-rolled dense naturaf ground. Yeat � and loose sand fill should be removed from beneath all slaU areas. i hz tloor sliould be cast I atop a minimum of �4 inches of pea gravel or other suitable material approved by the geoteclmical en�ineer as a capillary break. tt should also be prorected fro��i dampness by an impervious mois[ure barrier at least 10 mils in thichness or other��isc sealed. � 10.0 DI2AINAGG CONSIDBR:�'1'IONS � 7lie underlying glacially compacted soils arc relatively imperuieable and water will tend to perch atop this stratum. Additionally, traftic across Uiese soils �vhen diey are damp ur wet will ( result in disturbance of die otherwisc finn stramm. Therefore, prior to si[e work and � construction, the contractor should Uc prepared to provide drainage and suUgrade protection, as necessary. � All retaining ai�d footine walls should be provided �vith a ilrain at [he footing elevation. Draios sliould consist of rigid, perforated, polyvinyl chloride (PVC) pipe surrounded by washed pea i ��ravel. 11�e level of the perforations in the pipe should be set do�vn at die bottom of the footing at all locations and die drains should be constructed with sufficient gradient to allow � graviry dischargc away from tl�e building. In addition, all retaining walls should be lined with a minimum 12-inch-thick �vashed gra��el blanket or drainage mat approved by the �eotec}tnical en�.'ineer provided over die full hcight of the wall to �vithin 12 inches of final erade, and wliich tics into the footing drain. Roof and surface runo(f should not discharee inro [he footing drain system but should be handled by a seParate, ri�,id, tighdine drain. In planning, exterior grades aJjacent to walls sl�ould be sloped dowmvard away from the structure for a minimum distance � of 6 fect measured horirontally fr��m tlie �vall to achieve surface drain:�,e. � Dece�nl�er 30, '004 dSSOC1:ITED E:IRTH SC/EAS:'ES, INC. \�� 1 Page 10 � /`.y:;,!.p"p:';Jh4/d=�Yro)easl:.IX)Jn9/IKFiII'P