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Mikc Vance � i <br /> April 9 2004 <br /> }'agc 5 <br /> Thc contractor should be prcpamd to case �hc cxca�ations for the found�tion picrs if sccpage or caving <br /> occurs. ConUol of surfacc water runoff is also critical. Collec�ed surface or subsurface waler should not <br /> bc dischargcd on slope faces. Roof dr•rins should be cannected tu a tightline system, which is <br /> hydraulically indcpcndcnt Gom subgradc wall drains. The ground surface adjacent lo Ihe building should <br /> bc slopcd so that surfacc runoff�ows away Gom thc structurc. <br /> Erosion Control Measures <br /> Brosion control mcasures should 6= implcmcnted during project construction to mitigate thc hnnsport <br /> oC suspcnded solids in sitc runol'f stormwatcr. As a minimum, thc following mcasures mus: bc <br /> accomplishcd: <br /> • Prevem erosion from occurring by minimizing the arca of vegetative diswrbance, providing blanket <br /> protcction of diswrbcd arcas, and grading to avoid concenhation o(surfacc runoff onto or off of cut <br /> or fill slopes or nawral slopcs. <br /> • Interccpt surface runoff onto or off of disWrbed areas to control scdiment transport. This mo.• be <br /> accomplishcd by usc of intcrccptor swalcs,perimetcr dikes, brush barriers,ctc. <br /> • Provide crosion control system rcdundancics. For examplc, the abovc prcventativc measures should <br /> be combined with installation uf silt fences, straw bales, and rock check dams wherc appropriate. A <br /> rock stabdized lcmporary cntrance pad shauld also be providcd at all construction cntrances to the <br /> si�c. <br /> • Implcment permanent crosion control facilitics and hydrosecd all finished slopcs as soon as practical <br /> during the projcct. '1'emporary crosion protection may be necessary until permanent crosion <br /> protcction is cstablishrd. <br /> Prelimtnary Foundation Considerations <br /> E3ascd on our gcologic rcvicw and sitc rccrnuiai�sancc, cumpctcnt glacial soils aill likcly bc <br /> cncountcrcd at a dcpih of about 5 to G.5 fcct bclow cxisting ground srrfacc. \Vc recommcnd that thc <br /> foundation shafts supporting the new deck picrs bc founded below the upper loose/soR soils with a <br /> minimum cmbcdmcnt of 2 fcct into t • sc glacial till. An allowablc cnd bcaring pressurc for drillcd <br /> shatts is expectcd io be aPlcast G kips per squar� foot dcpeni.:�g on spccific soil con lrtions encountcred at <br /> thc lip clevation. Provided the bottom of the shafis is cicaned of all loosc soils, scttlements af thc sha(is <br /> will bc small (Icss than 'h inch)and shauld occur within t���o�vccks alicr loads arc applicd. <br /> \Vc rccommcnd Iha� a rcprescntaticc from our firm ubsc:ec thc bottom of shaR cxcavations pnor to <br /> conerc�c placemcnt to contirni th:u �ubsurface conditions are as expccted and �o rccommend <br /> modilications lo Ihe cmbcdmcnt dcp�h, ifappropriatc. <br /> LIMITATIONS <br /> �Vc ha�c prcpucd this rcpor� �Jr usc by I�4ikc Vancc. Our scrviccs ��crc providcd lo assist in thc <br /> e��aluation of soils for a proposcd deck to bc consiructed on rclati��cly tlat ground but ncar sloping tercain. <br /> Our recummcn�ia�ions are micndcd to impro�c �he o��crall stability of the site and to reducc the potcntial <br /> for tiiturc prupc�ty d:unagc rclatcd to carth mo�rmcnts, drainagc or crosion. I lo�vevcr, all construction on <br /> G c o li n g i n c c r s 1107R-0OI-0O �I'� <br />