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� <br /> March 14. 3010 <br /> /�dditiun to Slccvcs Rcsidcncc <br /> Lfin .lob No. 10-OOR <br /> Vagc 1� <br /> fill. Wc rcconuncnd that an cyuivalcnt (luid dcnsity (rFD) of 325 pcf(pounds per cubic <br /> foot) liir thc p�ssivc carth pressurc bc used for latcral resistance. 'fhc abo��c passivc <br /> pressure assumes that thc backlill is Ievcl or inclines up���ard bchind the foundations for a <br /> horizontal Jistancc at Icast twicc thc dcpth of thc foundations bclow final grade. A <br /> cocf7icicnt of Iriction of 0.50 bciwccn thc ti�undations and thc subgradc soils may bc <br /> uscd. "I�hc abovc soil paramctcrs arc unfactorcd ultimate valucs. and a proper fi�ctor of <br /> salcty should bc uscd in calculating thc resisting f'orces against latcral loads on thc ncw <br /> addition and dcck. <br /> SLAB-ON-GRADE FLOORS <br /> Slab-ai-graJc floors, if uscd, should bc placcd on linn subgradc soils prcparcd as <br /> outlincd in thc Sitc Vrcp�r�tion and Gcncral Gradine and thc Struclural Fill scctions of <br /> this rcporL Whcrc moisturc control is critical, thc slab-on-gradc tloors should bc poured <br /> on a capillary break which is in turn placcd on Uic compactcd subgradc soils. 'I hc <br /> capillary brcak should consist of a minimum liwr-inch-thick la��cr of frcc-draining gravel <br /> or crushed rock containing no morc than 5% by �veight passing tlie No. 4 sieve. Wc <br /> recommcnd that a vapor barricr, such as t� 6-mil plastic mcmbranc, bc placcd ovcr thc <br /> capillan� brcak lo kccp moisture li•om mi��ratin�� upwards. <br /> DR[VEWAY PAVEMENT <br /> Pcr�iirmancc of drivcway pavcmcnt is critically rclatcd to thc conditions uf thc undcrlying <br /> suUgradc soils. Wc cccommcnd that thc suberade soils undcr lhc roadway bc trcatcd and <br /> prcpurcd as dcscribcd in Uic Sitc Prcparation und Gcncral Gradink scction of this rcport. <br /> LIU & ASSOCIATES, INC. %����=�� <br />