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' <br /> 080 -Pa e 12 ' <br /> AET�#20-01 g <br /> ' <br /> exterior slabs, sidewalks, and pavements if only used in localized areas• ltead the standard data ' <br /> sheet entitled "Freezing Weather Effects on Building Construction" at the end of this report for <br /> further information regarding soil types and frost considerations. ' <br /> Re aini� Walls ' <br /> Excavadon and backfilling for support of the retaining walls should be performed as recommended <br /> in the guilding Grading Procedures section of this report. Foundation design should be as , <br /> recommended in the Foundations section of this report. ' <br /> Lateral loads will be exerted to retaining walls by the bacl�ill soils on the higher sides of the <br /> walls. To reduce these loads and to a11ow proper drainage, we recommend using free draining <br /> � , <br /> sands for backfill. The sand bacl�ill should have no more than 12°lo of the particles (by weight) ! <br /> nd ca ' the backfill with a layer of clay or other low , <br /> finer than the#200 sieve. We recomme ppuig <br /> permeability material which slopes away from the structure to min;m;�E surface water infiltration. ' <br /> We recommend designing the retainin$walls to resist the equivalent fluid weight lateral pressures ' <br /> given in the standard data sheet entifled "Basement/Retaini.ng Wall Bacl�'ill and Water Control" <br /> at the end of this report, based on the type of soil used as bacl�ill. We recommend the retaining ' <br /> wall lateral loads be based on the active condition since the top of the wall will not be braced <br /> during bac�g. ProPer drainage of the bacl�'ill soils is also recommended, using draintiles or ' <br /> weep holes. , <br /> Bacl�'ill against the walls should be placed in thin lifts and compacted with hand-operated <br /> action ' ment to reduce surfac.e subsidence. We recommend a minimum compaction level ' <br /> comp �P � <br /> of 95% of the Standard Proctor max�num �' ��i�3' �low all sidewalks, exterior slabs, and <br /> o action level of 90% can be used in landscaPed areas• `' <br /> stoops. A mimmum c mP <br />