Laserfiche WebLink
. Sep 29 00 12:37p GEOTECH COnSULTHHTS, InC. (4257747-8561 p.7 <br /> 1'eg���OA^�� JN 00378 <br /> September 27,2000 Page 7 <br /> All permanent wts irrto native soil should be inclined no steeper than 2:1 (H:�. FII slopes should <br /> not be consUucted with an inclinffiion greater than 2.5:1 (H:�. Water should not be allowed to flow <br /> uncontrolled over the top of any temporary or pertnanent slope. Also, all permanenUy exposed <br /> slopes should be seeded with an appropriate aper,ies of vegetation to reduce erosion and impiove <br /> the stability of the surficial layer of soif. <br /> DRAINAGE CONSIDERATIONS <br /> Foundation dreins should be used whsre (1) cxawl spaces or basemertts will be below a shuc�ture, <br /> (2) a stab Is below the outside grade, or (3) the outside grade does not siope downward irom a <br /> building, Dnina should also be ple�xd at th�base of aii earth-retaintng wa0s. These drains ahould <br /> be surrounded by at leaet 8 inches of 1-fich-minus, washed rodc and then wrapped in non-woven, <br /> 9eotexb'b flfter fabric (Mirafl 140N, Supec 4NP, or aim8ar material). At iG+ hiQhest poir�t, a <br /> Perfaated pfpe fnvert ahould be at kast 6 inches belpYv the bpttom of a slab floor or the level of a <br /> crawl apeee, and k should be aloped for droinage. <br /> All roof and surface water drains muat be kept separate irom the foundation drain system. A <br /> typical drain detaG is attached to this report as Piate X For tfie best long-term performance, <br /> perForated PVC pipe is recommended(or atl subaurface drains. <br /> Groundwater was obaerved during aur field wortc. If aeepage ia encourrtered in an excavation, it <br /> should be drained from tha sfte by di�ecting it through dr�inage ditches, per{orateci pipe, or French <br /> dtains, or by pumping it from sumps intercanneded by shellow eonrroctor trenches at the bottom of <br /> tha exqva6on. <br /> ' The exwvation and site should be graded so that surface water is dirocted off the site and away <br /> from fhe tops of slopes. Water should not be aUowed to atand in any aroa where foundaUons, <br /> siabs, or pavements are (o be cor�slruded. Fnal site grading in areaa adjaeent to the residanes <br /> shouid slope away at least 2 percent, except where the area is paved. Surface drair�a should be <br /> provided where neceasary to prevent ponding ot water behind foundation or rehaining vralls, <br /> AddiGonally, a drainage swale ahould be provided upslope of qie residence to intertxpt wrface rurr <br /> off and direct it around Uie residence. Water irom roof, storm water, and foundation drains should <br /> not be discharged oMo siopes; it should be tighUined to a suitable outiaN Iocated away from any <br /> slopes. <br /> OENERAL EARTIiWORK AND STRUCTURAL FJLL <br /> All buiiding and pavement areas shoutd ye�trfpped a wAace wgoqaon, topeoil, w8ank aoil, and <br /> other dekterious material. The slripped or removed materials should not be mixed xrith any <br /> materials to be used as structurai fili, but they could be used in norrstrudural areas, such as <br /> landscape beds. <br /> Strudural fill is defined as any fill piaced under a building, behind pertnanent retaininp or foundation <br /> walls, or in other areas where the underiyring soil needs to support toads. All structural fiil should be <br /> piaced in horizonfal Iifts with a moisfuro content at, or near, the optimum moisture content. The <br /> optimurt; moisture content is that moisture content that results in the greateat compacted dry <br />