The available points for each part are given in [yellow highlighting]. You have been tasked with evaluating the site described in the attached geotechnical report {see Canvas assignment for a link]. Assume the following site conditions: a] There will be a basement requiring excavation down to approximately 10 ft below the existing finished grade. See soil boring B-l through B-IS. b} The worst soil layer type defines the excavation parameters; SW. c] SW {well-graded sand} is not very cohesive and is predominately granular. d} For scale assume the excavated width to be 55 ft. e] There is a road traffic lane within 5 ft horizontal feet of the north face of the new building. Answer all the following questions using complete sentence answers: 1. OSHA Soil Classification Type: 1.1. What soil classication would OSHA categorize this type as? {3 points] Justify your answer [2 points} in a complete sentence. {1 pointsl 2. OSHA Required lay back: 2.1. What is the allowable slope forthe OSHA classification you determined to be appropriate? {3 points} Justify your answer [2 points] in a complete sentence. {1 pointsl. [Note: The Geotechnical report {page 12} does reference a slope for over excavations of shallow {c 5 ft] foundations. Do not mistake this slope with the one for OSHA-required laybacks.] 3. Sharing Requirements: 3.1. Does this excavation need to be shored'El Include the OSHA depth limit in your answer. {3 points} Justify your answer [2 points] in a complete sentence. {1 points] 3.2. Does the excavation protection system have to be custom designed by a Professional Engineer? OSHA shoring tables only work for trenches up to 15 ft wide. If open cut is allowed does it need to be designed by a PE? Include the OSHA depth limit in your answer. [3 points} Justify your answer [2 points} in a complete sentence. {1 points] [Note: page 2.9 of your textbook has a typo. Use my lecture content or go directly to the source document {OSHA Section 1925.551].] OSHA Required setbacks: Now assume you have the sEce on site for an open cut with a proper slope for the OSHA soil type and a perfectly level grade to perform the open cut excavation. 4.1. What does OSHA reguire the minimum setback to be for the excavation before the spoil pile begins accumulating? Give the horizontal dimension from the base of the excavation to the spoil pile edge. Show a calculation that adds the horizontal distance of the slope to the setback distance. [3 points] Show your calculations. [2 points] Use complete sentences to answer. [:1 points]. 4.2. What does geotechnical engineer the minimum setback to be for the excavation before the spoil pile begins accumulating? Give the horizontal dimension from the base of the excavation to the spoil pile edge. Show a calculation that adds the horizontal distance of the slope to the setback distance. [3 points} Show your calculations. {2 points} Use complete sentences to answer. [1 points}. 4.3. If there is a difference which one should govern? [3 points} Justify your answer [2 points] Use complete sentences to answer. [1 points]. Evidence of Soil Failure: Use the trench soil collapse video [found in the Module 4 folder}, PowerPoint presentations [found in the Modules 3 and 4 folders]. 5.1. Explain at least three signs of excavation slope failures that could occur. [9 points. 3 points for each sign {1 for complete sentence. 2 for correct signll 5.2. Explain at least three precautions that could be taken to avoid excavation slope failures. [9 points. 3 points for each precaution {2 for correct precaution, 1 for complete sentence]