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, , <br /> Testing Results <br /> There were two borings taken on the site ( , , � , , _ <br /> ��� ) near the top of the slope. The borings confirm that the slope is <br /> made up of predominantly Sandy Lean Clay (CL), in agreement with Gray. There is a 6' pocket of <br /> Poorly Graded Sand w/Silt (SP-SM) found in boring 2. CDP assumes this to be localized pocket, <br /> for none of Gray's hand augers exposed Poorly Graded Sand and there was no Poorly Graded Sand <br /> found in boring 1. Therefore Poorly Graded Sand was not used in the analysis. <br /> As soil borings 1 and 2 indicate, there were three (3) thinwall samples secured by Independent <br /> Testing Technologies, Inc. (ITT). One sample (Sample C) was taken from Boring 1@ 20' and was <br /> classified as Sandy Lean Clay (CL) by ITT. Two samples (Samples A and B) taken from Boring 2 <br /> @ 15' and 20' respectively, both were also classified as Sandy Lean Clay (CL) by ITT. <br /> Direct Shear Tests were run on samples A and C by Soil Engineering Testing, Inc. (SET). SET <br /> classified samples A and B as Sandy Lean Clay (CL) and sample C as a Clayey Sand (SC). Two <br /> direct shear tests were authorized for the project, so CDP instructed SET to run Direct Shear tests on <br /> samples A and C to obtain representative strengths of each material. The direct shear tests yielded <br /> the following results: <br /> • Sample A: Sandy L.ean Clay with little Gravel (CL): <br /> cp = 32.7° <br /> C = 226 psf. <br /> • Sample C: Clayey Sand with little Gravel (SC): <br /> cp = 31.7° <br /> C = 316psf. <br /> Slope Stability Analysis <br /> CDP ran a serious of four (4) global stability analysis (see attached) using the same GSLOPE Limit <br /> Equilibrium Slope Stability Analysis software used by Gray. The two different shear test results <br /> obtained from SET were modeled both with and without the timber retaining wall in the slope. <br /> Following is the summary of the results: <br /> Slope Stability Analysis (Cont) <br /> • Sample A: Sandy Lean Clay with little Gravel (CL): <br /> With retaining wall: SF= 1.63 <br /> Without any retaining wall: SF= 1.61 <br /> • Sample C: Clayey Sand with little Gravel (SC): <br /> With retaining wall: SF= 1.76 <br /> Without retaining wall: SF= 1.76 <br /> Civil Design Professionals • 8609 Lyndale Ave. S.,Suite 200 Bloomington, MN 55420 • Office 952-303-5312 • www.cdp-us.com <br /> 4 <br />