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April 10, 2005 <br />Proposcd Singlc-Pamily Residcnce <br />L&A Job No. 5 f1014 <br />Page 14 <br />A vertics�l draina,e Ulanlcet consisting of m Icnst 12-incl�-thick fi�ce-draining pea gravel or w,ished <br />gravel should be placed against foundation and retaining walls to prevent accumulation of <br />groundwatcr bci,ind and buildup of hydrost�tic pressure against the walls. The remnining <br />backfll shaald consist o�structur�l fill constructed per recommendations in the STRUCTURAL <br />rILL section oi'this rcport. "Che tor 12 inches of b�cklill should consist of compacted, cle�n, on- <br />site soils. 7lie backfill matcrial fo!� ihe foundation and retaining �valls shotild be compacted with <br />a liand-operated compactor. 1-leavy compa���c;: e�uipment shoulcl not be ullowed closer to the <br />�valls than a horizontal distancc cqual to lhc �vall heights. A I'ooting cirsin, �s recommended in <br />the S17'Is DRAINA�I: scciion of this rcport, should �Iso hc providc� f�r foundation and relaining <br />walls. <br />SLA13-ON-GRAI)I's I�LOORS <br />SIaU-on-grade iloors, if uscrl, should bc placccl un linn subgrade prepared as outlined in thc S17'B <br />PIZI3PARA'I'ION AND GLNrRAL f:ARTA\'�'ORK and thc STRUC'I'URAL PILL scctions of <br />this rcport. Whcrc tnoisturc conirol is critical, the slab-on-grade Iloors should be placed on a <br />c.ipillary brcak which is in lurn placed on thc couipactcd subgradc. '1'hc capillary Urc1h should <br />consist of .i miniiuum four-inch-thick layer of clean, frec-draining, 7/8-incl� cnished rock, <br />conlaining no morc than 5 perccnt by weighl pnssing thc No. 4 sicvc. A vapor barricr, such as a <br />6-mil plaslic mcmbranc, may Uc placed over thc capillan� break, as required, to kecp moisttvc <br />fi�ont migrating up�v.�rds. <br />SI'CI's 1)RAINAGIi, <br />Buildiug Footprinl Lacavatiou <br />Some runoff and nenr-surface perched groundwalcr ma�� bc encountered in tlie upper portion of <br />tl�e silc during and aflcr periods oC hcavy rain. If encountercd, a ditch or curtain drai�� mav be <br />installed along thc uphill side of the building footprint exc�vation to interocpt and drain away <br />sm•face runoff aud nenr-surf�ce groundwater. Also, the Uottom of Uuilding footprint cxcavation <br />LIU & ASSOCIA,T�S, INC. <br />