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Mr. &II Rueker W-8396 <br /> 25 Septemb�r 1992 P�pe 13 <br /> -- whichever is Iscs. Paesive resisunce within ths upper 2 fest of soil balow adjacent finished pround <br /> level should bs ne0�ected. Act'�e and at-rest e�rth pressurea ahould be essumed to aet over the eoldier <br /> _ pile spacinp above the adjacent pround surfaee and over the soidier pile diameter below thi: levet. <br /> Ws recommend lap0�np, or eoms other fo►m of eut face protection, bs ineutled in all areas. Lappinp <br /> or sttuctunl faein0 for soldier pils walls should bs desi0ned for the same lateral preasurec <br /> rscommended for rauininp wall desipn. Due tr� soil archinp effecu, the facin0 may ba desipned for <br /> — 50 psrcent of tha lateral eanh pressure: prosented for retaininp wall desi0n. Prompt and careful <br /> insuUation of the facinp will reducs ths potentiat for loss of adjacent pround. The requiremanu for <br /> , . wNi facinp should be meds the rosponsibility of tha contraetor to prevent soil failure, slouDhinp and <br /> loss of pround, and to provids s�fe workinp conditions. Ws recommend any voido behind the facinp <br /> be backfilled. Tha b�e�ll should ba psrmarbla and not allow potentiai hydrostatic pressure to build <br /> up behind ths wall. Drainape behind ths wall must bs mainUined. A parmsabta aand slu►ry or pe� <br /> pravel backfill should be conaidered for wali facinp backfill. Based on the silt content of the on-she <br /> �:� <br /> toila, ths excavated soils would not be auitable for use as wall facinp bac�ll. We recommend t at <br /> � a peotextils product such as Miradrain 6000 or aquivalent be used in conjunction with permeabie <br /> � � backfill to provide drainape and prevent hydrostatic pressure buildup behind the retaininy wall. The <br /> � � water from such a system should be collected in a pipe network at the base oi the wall and tiphtlined <br /> � ' , , to a stormwater disposal system. Altemately,the system may be connected to a seriss of weep holes <br /> I , nev the bottom of Me watl, with the collected water directed to the atormdnin system via a french <br /> drain or swale at the front of the wall. <br /> Draimpe Con�iderations <br /> ' ' Site drainape will ba a key component in maintaininp adequate slope stability durinp and after <br /> ' construction,permittinp necessary foundation and utility excavation,facilitatinp equipment access,and <br /> minimizinp pround disturbance. As recommended above, all faundations and retaininp walls should be <br /> • ptovided with appropriate permanent drainape features with collectad water directed by tiphtline <br /> connactora to a suitable discharpe point. Surface drainape and enpinaered draina0e cyatems should <br /> not be atlowed to discharpe on or abave site slopes as potential slope destabilization may result. Any <br /> surtace water or Oroundwater seepape encountered durinp construction should be collacted and <br /> disposed of similarly. Excavations in propress should be provided with positive drainape Oradients and <br /> collectors to avoid ponded or puddled water. <br /> , AGRA <br /> � Earth&Environmental Group <br />