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Geotechnical Investigation <br />^ <br />Proposed Courthouse Square - Salem, Oregon <br />is 20 feet, use an active pressure of 72 pcf. For other ground water levels, <br />' relative to wall height, active pressure should be determined from the table <br />~~ below (use the ~= 30 ° graph line). We recommend a coefficient of slidin <br />g <br />resistance, at the base of concrete foundations, placed on native granular soils, <br />of 0.50 for use in analysis. It is imperative that basement walls be adequately <br />water proofed. <br />~ <br />0 <br />1.0 1.2 1.4 1.6 <br />RATIO (PA+ PW)/PA <br />INCREASE OF WALL <br />FORCE w/RISING <br />WAT R <br />_ _ .~.~3 ... ~~ 0. <br /> <br /> ~= 30' <br /> Y =125 PFC <br />YT =62.5 PFC <br />SUB <br /> <br />1.8 2.0 <br />~ ' <br />~ 9. For low unrestrained retaining walls the following design criteria should be utilized <br />in the design: Where anticipated wall movements may be greater than 0.5 percent of <br />the wall height, walls backfilled with import sand and gravel material, crusher reject, <br />~ or approved on site materials, should be designed for an equivalent fluid lateral earth <br />pressure of 38 pcf for a level back fill condition. We recommend a coefficient of <br />sliding resistance, at the base of concrete foundations placed on granular soils, of <br />~ 0.50. <br />The above-stated design criteria is a minimum and may be increased by the structural <br />engineer. <br />~ <br />~~~ <br />~; centurywest <br />ENGINEERING CORPORATION ~ O <br />March 7, 1997 40808.OD1.08 <br />s <br />~ <br />~.o <br />.:8 - <br />~ <br />; .6 <br />_ <br />0 <br />~ .a <br />¢ <br />~ <br />.2 <br />~ <br />