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7 <br />1 <br />• 1 • <br />tr <br />% <br />! <br />■ <br />GORDON R COFrIN <br />LASO SUPVtVOR ASD PLASStR <br />3025 V* At t RT r/. N ROAD <br />LONG LAKE Mf*4N S5356 <br />^5^ <br />/Csy/^-7-^ <br />473 4141 12-4-78 <br />15rs, Alexander Holzer <br />2677 Casco Point Road <br />Vaj-zata, Minn, 55391 <br />Dear Mrs, Holzer:IT <br />V^» ry <br />/-A* •o <br />The following comments are Intended to expand upon the brief stateoente <br />Dade in the letter to you dated October 31, 1978, <br />Nature is constantly at work trying to reduce steep slopes to a flatter <br />pade. Remedial works are carried out with the object of stabilizing the por- <br />wons of the slope where slips have occurred or where they are likely to occur. <br />This can be achieved by the following measures: <br />(1) by providing some external support; <br />(2) by removing some of the weight tending to cause slipping; <br />(3) by Increasing the strength of the soil within which the slip <br />surface occurs. <br />Not all of these measures are required in every sitxiation. The most ex­ <br />pensive and safe measure would bo to construct a retaining wall at the bottoa <br />of the slope. In order to bo sufficient, however, the wall would have to be <br />high compared with the height of the slope in question, When the <br />height of the wall represents only a small proportion of the hei^t of the <br />embanknent, little support can bo expected, and slides at the top could still <br />occiu. The foundations for the wall would also have to extend below the slip <br />surface in order not to be undermined. I feel this would be too costly a <br />measure for your situation. <br />Another measure available would be to remove some of the weight of the soil <br />at the top which could cause slippage. This coidd be accomplished by construct­ <br />ing one or more berms to reduce the weight in the upper portion of the bank. <br />Small retaining walls would be needed to hold back the steep slopes between the <br />flat berms. The retaining wall that you have partisdly constructed, and the <br />removal of some of the material at the top of the bank, as evidenced by the <br />flat berm, have helped in this respect. I feel a series of berms and retaining <br />walls would be safer but probably more costly for your situation than required. <br />Most slips occur in cohesive material and take place because the soil has <br />become weakened by an increase in moisture content. This is what appears to <br />have happened on your neighbor's property to the south, and considering the <br />similar soil conditions, slope of land, and vegetation present, a similar <br />result could occxu* on your property unless remedial steps are taken. <br />The measures needed to remedy this sitiuition are providing surface drains <br />to direct the vater in s desired manner, and establishing ground cover to bind <br />the soil and provide transpiration and shedding of moisture.