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Outlet for any accumulated water. The drains should be provided with cicanouts at easily <br /> accessible locations, These cleanouts should be serviced at least once every;year. The wall <br /> drainage material should be capped at the ground surface with I.-foot of relatively impermeable soil <br /> to prevent surface intrusion into the drainage zone. Alternatively,the 12-inch wide drainage layer <br /> placed against.the back of the wall.can be replaced with a Mirafi MOON Drainage'Board,or an <br /> approved equivalent. If drainage board is used,the 4-itch perforated PVC pipe should.be covered <br /> with at least 12 inches of clean washed gravel and the drainage board should be hydraulically <br /> connected to drainpipe and surrounding gravel. <br /> With wall. backhll .placed and.compacted as .recommended and the wall drainage properly <br /> installed, unrestrained walls can be designed for an active earth..pres:sure equivalent to a #Auld <br /> weighing 35 pcf, For restrained walls, an additional uniform lateral.pressure of IOU psf should be <br /> included. '.1`Itcse values assume a horizontal backt%ll condition anti that no!other surcharge <br /> loading,such as fraffte,sloping embankments,or adjacent buildings,will act on the wall. If such <br /> conditions exist, then the imposed loading must be included in the; wall design. Friction at the <br /> base of the wall foundation and passive earth pressure will provide resistance to these lateral <br /> loads. Values for these partineters area provided in the"Foundations"section of this report. <br /> Lower Level Building and Retaining W411 Porannieter Summar <br /> Description Condition *Design Vauae <br /> Earth Pressure Unrestrained 35 cf <br /> Earth Pressure Restrained T Additional I.00 sf <br /> Earth Pressure. Surchar,e_ De cridcnt u . n ma etude <br /> 'ttaetains regart ing the use of(bust parameters.are provided in the sectkut above. <br /> i <br /> 5.7 Permanent Slaves and Embankments <br /> All perntartent cut and fill slopes should be}graded with.a finished inclination of.no greater than <br /> 2:1 (i-lorizontal:Vertical). Upon completion of grading, the slope face should be appropriately <br /> vegetated or provided with other physical means to guard against.erosion. Final grades at the top <br /> of the slope must proinote surface drainage away front. tho.slope crest. Writer tntetit nut be <br /> allowed to flow in tin sincontrolled'fashion over the slope.face. if it is necessary to direct surface <br /> runoff towards the slope, it should be controlled at that top of the slope,piped in a closed conduit <br /> installed on the slope face,and taken to an appropriate point of discharge beyond the foe. <br /> All fell used for slope and embankment construction should meet the structural fill requirements <br /> s described in the Site Preparation and Clrading section of this report. 1n.additioo,if new fills will <br /> be,plared over existing slope~of.20 pet�cent or greater,the structural fill s iould be keyed and <br /> benched into competent slob:toils. <br /> I; <br /> A$es Engineering,LLB' tape n t <br /> I: <br />