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r <br /> April 7, 2005 <br /> Mr. Don Lc�in <br /> L&A Job No. SA037 <br /> Pagc 7 <br /> SITE PRF.PARATION AND GF.NF.RAL GRADING <br /> Sitc prcparation shoidd indudc cicaring and gnibbing ���ithin construction limits of thc ncw <br /> residencc. 'I'hc cxisting housc to bc dcmolishcd should also havc its foundations rcmoved. <br /> Surficial topsoil mid wcak soils in thc root zonc should bc strippcd down to dcnsc sand and/or <br /> hard silt soil laycr within thc building pad of thc ncw garagc and thc ncw driveway. Thc czposcd <br /> soils aftcr stripping should bc compactcd to a non-yidding statc with a mcchanical compaclor. <br /> During construction, onc or multiplc lincs of intcrccptor trcnch drains should bc installcd along <br /> thc uphill side of thc sitc and bchind thc crest of thc stecp slopc, as rcyuircd, to intcrccpt and <br /> drain away surfacc runoff and ncar-surfacc groundwalcr scepagc to facilitatc grading and <br /> foundation construction work. Wcdcr collcctcd in such intcrceptor trcnch drains should bc <br /> convcycd into a ncarby strcct sidc slonn inlcL 'I'hc stonn inlct should bc covcrcd with a filtcr <br /> sock to prcvent scdiiucnl Gom cnlcring thc stomi sewcr systcm. Thc filtcr sock should bc <br /> cicancd periodically to prevent it from clogging, and should bc rcmovcd aficr thc construction <br /> ���ork is contplcted. <br /> 'fhc onsitc surlicial soils contain a high perccntagc of lincs and aro scnsiti��c to moislurc. r� laycr <br /> of cican yuarry spalls should bc placcd, as rcyuircd, ovcr cxca��atcd arcas and arcas of frequcnt <br /> u•affic to protcct thc subgradc soils from disturbanca Silt fcnccs shoulJ bc crccted along thc <br /> do���nhill sidc boundarics of thc sitc to prcvcnt scdimcnt from bcing transportcd by stomi nmoff <br /> onto adjoining propertics, thc slrccl or thc adjaccnt stccp slopc. Thc hottom of silt fencc filtcr <br /> labric should bc anchored in a trcnch fillcd ���ith gra��cl. <br /> GXG�VATION SI.OPF.S <br /> Under no cirewnstance should exc:nation slopes be grcater than the limits specificd by local, <br /> st:uc and Icdcral safcty rcgul:itions if �eorkcrs h.i�•c to perlonn conslniction ���ork in cxcavatcd <br /> � <br /> LIU & ASSOCIATES, INC. �\�� j <br /> ���, � / <br />