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V; <br />Mr. Steven Spartz <br />GME Project No. 6721 <br />.(J.O <br />■■•%. f . <br />• / • • <br />- •*. • %v ,» <br />. > <br />4t <br />h j <br />February 18, 1997 <br />Where the walls are higher than three block courses in height, we <br />recommend that each block (including the blocks below three block <br />courses) be adhered together with a high modulus outdoor construction <br />epoxy, such as Hilte ClOO or Seca 32. The use of the epoxy is required <br />since the blocks have very little block to block shear resistance. <br />Please be advised, however, that by adhering the blocks, some cracking <br />may occur over time, due to frost induced movement. <br />Where the wall is higher than four block courses in height, we also <br />recommend restraining the wall by the installation of earth anchors. <br />The anchors should be 5 feet long and have a single 6 inch diameter <br />helix at the end. Anchors should be attached to the fourth and seventh <br />block courses. We recommend that the anchors be spaced two block <br />courses horizontally. We have amended your elevation drawings to <br />indicate the location of the anchors. These amended drawings are <br />attached. The anchors should be carefully rotated horizontally into <br />the clay soil. Careful installation of the anchors will be required to <br />reduce disturbance of the clay as the helix and shaft enter the soil. <br />Each anchor must be installed so that the entire 5 foot length is <br />e.tibedded into the soil. The anchor should be properly tensioned and <br />appropriately secured to the block. In our opinion, the attachment <br />detail you indicate on your drawings would be adequate. <br />Included with this report is a diagram that you had prepared outlining <br />the bluff toe protection that you have partially implemented by the <br />installation of the 3 foot diameter boulders. During our site visit of <br />February 12, 1997, we observed that the boulders had already been <br />placed. We recommend that the voids between the boulders be filled <br />with topsoil, and that the vegetative growth be established (Mn/DOT <br />2575) on the exposed topsoil between the boulders. Some slumping of <br />the topsoil may occur with time, into the voids, and these slumped <br />zones should be backfilled with topsoil, and vegetation should be re­ <br />established. In our opinion, this toe protection should be adequate <br />for erosion control of the exposed slope face at the location of the <br />boulders, provided that adequate vegetation can be established and <br />maintained between the boulders. <br />Concludlna Comments <br />We recommend that you complete the "Project Quality Contractor - <br />Project Completion Form" after construction. It is understood by all <br />parties that the contractor will be responsible for the methods and <br />results of his/her work. We will not warrant, assure, or guarantee the <br />work of the contractor. <br />The contractor must comply with the latest OSHA regulations for trench <br />and slope excavation, and general construction site safety. The <br />contractor must designate one of his field personnel as the OSHA <br />"Competent Person" who must be capable of identifying existing and <br />predictable hazards on site, including temporary slope stability. The <br />Competent Person must have authorization to direct prompt corrective <br />measures to eliminate hazards. GME will not accept any responsibility <br />or liability for construction safety on this project. <br />GME CONSULTANTS. INC.