1725 GRAND AVE 2018-01-02 MF Import

( . . INovember ]0, 2000 G-1266 Gillette Residence Page 7 5.7 Conventional Retainin6 W�IIa IRetaining walls restrained horizontally on top(such as basement walls)are considered unyielding � and should be dPsigned for a lateral soil pressure under the at-rest condition;while conventional roinforced cont ;te walls free to rotate on top should be designed for an active lateral soil pressure. Active E�rth Pre.��ure i Conventional reinforced wncrete walis that are designed to yield an amount equal to 0.002 times the wall height, should be designed to resist the lateral earth pressure imposed I by ur,equivalent fluid with a unit weight of 30 pcf for level back611 behind yielding retaining walls. At-Reat Earth Presaure Walls supported horizontally by floor slabs are considered unyielding and shoufd be designed for lateral soil pressure under the at-rest condition. 'fhe design lateral soil pressure should have an equivalent fluid pressure of 45 pcf for level ground behind permanent unyielding retaining walls. Paaaive E�rth Preaaure � 350 pcf equivalent fluid weight for st�vctural fiL' and dense na�.ive soil. Baae Coerficient of Friction r fill and dense native soil. , 0.35 for structu al We recommend that a vertica! drain mat, Mirndrain 6000 or equivalent, be used to facilitate drainage behind permanent concrete retaining walls. The drain mat core is placed against the wall with the filter fabric side facing the backfill. The drain mat extends from the finished surface grade, down to the footing drain pipe. A minimum of 18 inches of clean, free-draining, washed rock, cnished rock, or pea gravel should be placed in the bottom of the footing trench. With the above exceptions, perimetcr foundation drainage recnmmendations and installation procedures should be followed in Section 5.8: Drain�ge Conaiderxtiona. Please also refer to Plate 3 - Typical Retaining Wall Backfill and Drainage. Geo Group Northwest, Inc. 12�2d