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Conclusions: <br /> Each of the boulder walls have adequate size, as the minimum boulder wall depth(�20") is more than <br /> adequate for the given site surcharge conditions (no dead load, no live load, or top slope), minimum wall <br /> batter(10°), and the maximum wall height(3.8'). A 12" minimum boulder would actually meet minimum <br /> safety requirements of: <br /> SF sliding= 1.50 <br /> SF overturning= 1.50 <br /> SF bearing= 2.0 <br /> The walls have adequate spacing between them to avoid surcharging the lower wall, creating a global <br /> stability issue. The minimum spacing requirement is 2H1, where H1 is the height of the lower wall. The <br /> case for an acceptable margin of safery is further strengthened by the fact there is no slopes above, between <br /> or below the walls, the soil on the site is good material, and the boulders are oversized relative to the <br /> maximum wall heights. <br /> Therefore, it is my professional opinion that the boulder retaining walls meet all minimum industry safety <br /> factors, and will function properly and safely. These conclusions retained are based on my professional <br /> opinion. These opinions are arrived in accordance with accepted engineering practices in this time and <br /> location. No other warranty is implied or intended. Should additional information become available, this <br /> report may be modified based on the new data. <br /> Respectfully, <br /> Michael. R.Johnson, PE <br /> President/CEO <br /> Civil Design Professiona/s • 8609 Lynda/e Ave.5.,Suite 200 8/oomington,MN 55420 • O�ce 612-284-3696 • www.cdp-us.com <br />