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� Geotcchnical Enginccring Gvalu:�tiun <br /> Engl:md Avenuc I.ot <br /> � Junc 2, 2005 <br /> NGA File No.41 I805 <br /> Pagc G <br /> � Rockcry structums may also bc used to Ficc grading cuts. Wc havc pro��idcd reconuncndations for <br /> constniction of rockcrics to facc grading cuts in thc drivew:ry and lawn arcas. <br /> ' Erosion Control Mcasures <br /> � Thc crosion hazard for thc on-sitc soils is considcrcd hi�h, but will be depcndent on how thc sitc is graded <br /> and how water is allowed to concentr.�te. Best Management Practices (BMPs) should be used to control <br /> ( erosion. Are:�s disturbed during conswction slioulJ Ue protected from erosion. Frosion control measures <br /> may include Jiverting surface water away from the slripped arcus. Silt fences or str.iw bales should be <br /> Icrected to prevent muddy watcr from Icaving the sitc. <br /> I Sitc Preparation and Grading <br /> After erosion conu�ol measures are impletnented, site preparation should consist of stripping any topsoil <br /> or loosc soils to espose medimn dcnsc or bcttcr nativc matcrial in foundation, slab-on-grade, and <br /> Ipavcment arcas. The stripped materials should bc removed from the sita Only very limited amounts of <br /> materi:d should bc stockpiled on this site. Stockpiles should be kept :�way from the top of the steep slope <br /> ! and thc excavation walls,and should bc covcred with plastic. <br /> IIf thc ground surfacc aftcr stripping should appcar to bc loosc, it should bc compacted to a non-yiclding <br /> condition. Areas observed to pump or weave durine compaction should be rcworked to structural fill <br /> � specifications or over-excavated and replaced with swcwral fill or rock ti�1IIti. I� SIoIl1IlCant sur(acc <br /> water Oow is encountercd during coi:��niction, this flow should be divened around arcas ro be developed <br /> Iand:nvay from the stecp slope. and the e�poscd subgrades should be maintained in a semi-dry condition. <br /> � IC wet conJitions are encountered, altemalive site stripoing and grading techniques might be necessary. <br /> � These could includc using large exca��ators equipped with wide tracks and :t smooth bucket to complete <br /> site grading and covering exposed subgrade with a layer of cn�shed rock for protection. If«�et conditions <br /> are encountered or construction is attempted in wet �veather, the subgrade should not be compacted as this <br /> could cause further suberade diswrbance. In wet conJitions i� may be necessary to cover the exposed <br /> subgrade wilh a I;tyer of crushed rock as soon as it is e�poseJ to protect the moisture sensitive soils from <br /> disturb�mce by machine or foot traffic du�ing conswction. Thc prepared sub,rade should be protected <br /> from construction traf(ic and surface water should be diverted around prepared suhgradc. Shallow <br /> I <br /> NELSOfV GEOTECHN/CAL ASSOC/ATES, INC. <br /> f <br />