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�. <br /> . <br /> October ]1,20ll <br /> �1r, Harvey Jubie <br /> 1.&n Job No. 11-0(4 <br /> Page 13 <br /> ftASEMENT NALLS <br /> Bascmcnt �ealls of tlie pcoposed ne�v residence �ti�ould be resu-ained �t the tup from lateral <br /> mo�•emcut u�d should be designed for ti luterul soil pressure under ihe ut-rest �:onditiun. �Ve <br /> recommend thai mi at-rcst soil pressurc of 45 pef GPD (equivnlent fluid density) be used I'or thc <br /> design of bascmcnt �valls or extended looting wulls. l-n counter thc abovc acti�•c soil pressure, u <br /> pnssive lateral soil pressurc of 3�U pcf LPD may be used. To resist against sliding, thc friction <br /> I'orcc bcati•ccn ilie footings und the subgradc soils mtty be calculated based on a coclYicicnt of <br /> friction of 0.G0. The above soil paranuters are ultunate calues based on a fulh�drained condition <br /> of thc ���alls, and proper factors of snfety• factors s1wu1J be applicd in the design of the basement <br /> walls or extcndcd footing���ulls against sliding and o��crtunung t'ailures. <br /> A ��crtical drainage i�lanket. at least 12-inclrthick horizontally, consisting of clenn, &ce-draining, <br /> pea gruvel or washed g�'a��el a� crushed rock, should be placed agaii�st tl�e Uack oF basement or <br /> extended footing «'alls to pre��ent accumulation of growid�vater behind and buildup of <br /> hydrostatic pressure against tlic «'alls. '1'his drainUge blanket GII should bc cotupacted to a non- <br /> vi�idina statc ���ith a vibratory compactur. Structural till should bc used for b�cklilling the ��°alls <br /> bchiud`tl�c ��erticul drainage hlanket. 7�he top 12 to 18 inclies of the buck�i�� ma}' eonsist of <br /> cumpactcd, cican, on-site c:ranulnr soils. ln orJer not to damaec thc bascmcnt ���alls, only hwiJ- <br /> hcld, light-«'eight. compaction e4uipment sliould be allo�acd �ti'idiin a l�orizontul distance of the <br /> �ti�alls equul to the �+�all heigh[. A �1-inch perfornted PVC footing drain pipe, �t recummendcd in <br /> d�c lll�1lN��GE CONTROi. sectinn of tl�is rcport, should bc pro�'ided for the b:uement ur <br /> estended fouting��"alls. Thc footuic drain lines sliouW be hyJraulically connectcd to thc drainage <br /> blankct bchind the walls. <br /> LIU & ASSOCIATES, iNC. <br /> � � �� � <br /> ; :� � <br />