03-25-1996 Council Packet - Laserfiche WebLink

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f ^ Mr. David Kline February 29, 1996 Alternatively, the upper wall could be restrained by installation of earth anchors. You indicated that the anchors you plan to use for this project would be 4 feet long, having a single 6-inch diameter helix. We recorrunend two rows of earth anchors. The lowest row of anchors should be located along the wall face at a height of 25% of the wall height up from the grade in front of the wall. The upper row of auichors should be located a distance of 25% of the wall height down from the top of the wall. We recommend that the anchors be spaced 3.5 feet on center with the upper row of anchors off-set from the lower row of anchors by 1.75 feet (21 inches). The anchors should be carefully rotated into the clay soil at an angle of about 10® down from horizontal. Careful installation of the anchors will be required to reduce disturbance of the clay as the helix and shaft enter the soil. The anchors should be advanced by mechanical means. Each anchor must be installed so that the entire 4 foot length is embedded into the soil. The amchor should be properly tensioned and appropriate secured to the timbers. An important component of the retaining wall will be pedestrian safety. Our scope of services is limited only to the design of the timber retaining walls. The owner will be responsible to provide adequate pedestrian safety devices such as railings or fencing. We recommend that you complete of the "Project Quality Contractor - Project Completion Form" after construction. It is understood by all parties that the contractor will be responsible for the methods and results of their work. We will not warrant, assure or guarantee the work of the contractor. The contractor must comply with the latest OSHA regulations for trench and slope excavation, and general construction site safety. The contractor must designate one of field person as the OSHA "Competent Person" who must be capable of identifying existing and predictable hazards on site, including temporary slope stability. The Competent Person must have authorization to direct prompt corrective measures to eliminate hazards. GME will not accept any responsibility or liability for construction safety on this project. The recommendations contained in this report are based on our understanding of the project and represent our professional opinions. These opinions were arrived at in accordance with currently accepted engineering practices at this time and location. Other than this, no warranty is implied or intended. Our recommendations are based on certain assumptions stated in this letter. If different soil conditions are observed during construction, we must be notified so that we can review our recommendations. CMf COMSULTAMTS. INC