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1 <br /> • �: <br /> µv Pr- <br /> � <br /> r. I. <br /> I ' <br /> L � <br /> � 1 <br /> 1 <br /> t"y� . ` <br /> ��� I <br /> ��� � <br /> ��� ,..� ��'► ! <br /> �d i <br /> Q 4 <br /> ��,8 � i <br /> Q. � <br /> �Z H Kelvin and PTtti Farton JN 91322 i <br /> �:y� October ?_2 . '991 Page 7 <br /> �r � <br /> ��fq � <br /> O�tO <br /> section enti �. ed ��$A1._''AFTHWORK AND L�TRUCTUI�.AI FILL <br /> � contains recommendationa regarding placement and <br /> y o y compaction of structural �ill behind retaining and � <br /> foundation Halls . <br /> i <br /> $�AVATIONS AND SLOPES f� <br /> In no r.ase should excavar.ior, slopes h,e greater than the limit:c <br /> specified in loc�i , state, and national government safety <br /> regulations . Temporary cuts to a depth of about four (4) fee'c i <br /> in unsaturated soils may be attempted 'rertically. eased upon <br /> n'ashington Adininistrative Code (wAC) 296 , Part n�, the soil <br /> type at the sita wculd be classified as Typp B, and therefore , <br /> slopes grea�.er than four fe::t cannot be excavated steeper than <br /> 1 : 1 (Horiz_ntal :vertical ) , <br /> �'f��� qll peri�anent cuts into naCive soils should be inclined no <br /> ` steeper tlian 2:1 (H:V) . Fill slepes should not be constructed <br /> i with an � nclination greater than 2 : 1 !H:Vi . Water should not <br /> 1 ' be alloMed to flow uncontrolled over the top of any slope. <br /> �� Also, al � permanently e:cposed slopes should be seeded with an <br /> �� appropriate species of vegetatinn to reduce erosion and <br /> i improve stability of the surficial layer of so: l . <br /> Any disturbance to the existing slope outside of the building <br /> I ��� � li .nits may reduce the stability of the slope. Damage to the <br /> � � existing vegetation and ground should be minimized, and any <br /> disturbed areas should be revegetated as soon as possible. <br /> Soil from the excavation should not be placed on the slope, <br /> whidi may require off-site disposal of surplus soil . <br /> r� <br /> DRAINACE GONSIDFRATIONS <br /> �� We recommend the use of footing drains at tfie base of all <br /> footings and backfilled earth retaining walls. These drains <br /> should be surrounded by at least six (6) inches of one-inch- <br /> � min��s washed rock wrapped in non-woven geotextile filter <br /> fahr-ic (Mirafi 140N, Supac 4NP, or similar material ) . At the <br /> ��'� highest point, the perforated pioe invert should be at least <br /> as low as the bottom of the footing and it should be sloped <br /> for drainage. All roof and surface water drains must be kept <br /> separate from the foundation drain systein. A typical drain <br /> detail is attached to this report as Plate 5 . <br /> � GEOTECH CONSULTANTS , INC. <br />