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Valota Raad 5-Lot ResidentiaJ Developmer�t Decer$�B� - Page 135 <br /> � <br /> 1i <br /> be at tl�e direction o�the architect/engineer. <br /> U#iliLy Trenches <br /> 1. A select, noncorrosive, graz�ular, easiiy compacted material should be used as bedding <br /> and shading immediately around utiliiy pipes. The srte soils �nay �e used for trench <br /> backfill above the select material. �f obtaining compaction is difficult with the site soils, <br /> use of a more easily compacted sand may be aESirable. The upper �oot a�backfill shau�d <br /> consist of native material to reduce the potential for seepage of vvater into the backfill. <br /> 2. Trench backfill in the upper 8 inches of subgrade beneath pavement areas should be <br /> compacted to a rninimum of 92 percent of rna.ximum dry density. Trench bac�Cfill in other <br /> areas should be compacted to a minimurn of 90 percent of maxim�.un dry density. Jetting <br /> of utiliry trench backfill should not be allowed. <br /> 3. Where utility �renches extend under perimeter foundatians, the �renches should be <br /> backfilied entire�y with native soil compacted to a minirnum of 90 percent of maximum <br /> dry density. The zone of native soil should e�tend to a miniznum d'zst�ce of 2 feet on <br /> both sides of the faundation. If utility pipES pass through sleeves cast into the pezixneter <br /> foundations, the annulus betvaeen�Y�e�ipes and sieeves should be compietely sealed. <br /> Srte Drain�.ge and Finish Improvements <br /> l. Unpaved gxound surfaces should be finish graded to direct surface runoff away frorn site <br /> improvezxaents at a z�ninixnum 2 percent grade for a nnin.iz�n.uzn distance of 5 �eet. If this is <br /> not practicable due to the terrain or other szte �eatures, swales with improved surfaces <br /> shoutd be provided to divert drainage away from irnprovements. The landscaping shouid <br /> be planned and installed to maintain proper surface drainage conditions. <br /> 2. Runoff froixa dri�eways, rao�gutters, downspou�s, planter drains and other improvements <br /> should discharge in a non-erosive mannex away from foundations, pavements, and o�er <br /> irnprovements. <br /> 3. Stabilization of suxface soils, particul�rly those dzstuxbed during construction, by <br /> vegetatio� or ather means during and following cpnstruction zs essential to protect the site <br /> from erosion damage. Care should be talcen to establish and mainkaan vegetation. <br /> 15 <br />