1625 ENGLAND AVE 2016-01-01 MF Import

Gcotcchnical 1'aiginccring L'valuation I G25 Gngland Avcnuc Gvcrctt, �Vashington NGA Pilc No. 781 G08 Pcbruary 30, 2008 Pagc 7 ITemporury :�nd Pcrmanent Slopcs I Wc undcrstand that tcmporary cut slopes arc planned for thc construction of the residencc. Stability of cut slopes is a function of many factors, sucli as the rype nnd consistency of soils, depth of the cut, I surchargc loads adjncent to thc cxcavation, Icngth of timc a cut remains open, and the prescnce of surfacc or groundwatcr. It is cxccedinbly difticult undcr thcsc vnriablc conditions to pro-cstablish a "safc and maintcnancc-frec" temporary cut slope anglc. Thercf�rc, it should bc thc responsibility of the contractor Ito maintain safc slopc configurations, sincc thc contractor is continuously nt thc job sitc, nblc to obscrvc thc naturc mid condition of tlic cut slopcs, and ablc to monitor thc subsurface matcrials and eroundwatcr Iconditions cncountcrcd. ( 7'hc following irformation is providcd solcly for thc bcnefit of ihc o��ncr and othcr dcsien constdtants mid should not hc construcd to imply Ihat Ncison Gcotechnical Associatcs, Ina assumes responsibility forjob Isitc safcty. Job sitc safcty is Ihc solc responsibility of thc projcct contnctor. Wc recommend that tcmporary cuts in tlic mcdium clensc on-sitc soils hc no stccper than 2 Florizontal to I IVertical (2FI:IV). Stecper inclinatiais may bc fcasible if dcnse soil is e�posed. If loosc soil or groundwater is encountered, wc �vould c�pect that (lattcr inclinations would be necessary. \Vc Irccommend tliat cut slopes bc protecicd from erosion. Grosion control mcnsures may incluJc covering cut slopcs with plastic shccting and divcrting surfacc runoff:way Gom thc top of cut slopcs. We do not I recommend vertical slopes for cuts dceper U�an four tcet, if��orker xcess is necessary. We recommcnd that cut slopc hcighls and inclinations conform to all appropriatc OSIiA/WISfIA regulations. If thcsc temporary inclinations are not fensiblc due to bounclary constraints ancllor soft and ��ct condilions, icmporary shoring or a combination of safc slopc inclination and shoring shoulJ bc considcrcd. A ncar vcrtical cut ovcr four feet in hcight is located along thc �vcstcrn sidc of thc proposed building. Althougli this cut appears stable, we do not reconunend worker access within ten fcct of this cut �vithout temponrily shoring this cut. All OSIiA/NISIiA snfery rcquircments should be observed on this site at all timcs during consvuction. Maintnining safc sitc conditions is a solc responsibility of�hc contractor. NGA assumes no responsibiliry for thc stabiliry of this cut and/or any othcr safcty issucs. Permanent cut and fill slopcs should bc no steeper than 2II:1V. liowevcr, Oatter inclinations mny bc rcquircd in areas whcrc loose soils are encountered. Pennancnt slopes should be plantcd �nd the plants should bc maintaincd until thcy arc cstablishcd. NELSON GEOTECHN/CAL ASSOC/ATES, /NC. I ��v