Geotechnical Report review

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School

Rio Hondo College *

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Course

140

Subject

Civil Engineering

Date

Dec 6, 2023

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pdf

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Uploaded by DrFreedom12043

Rio Hondo College – CIV 140 assignment: Geotechnical Report review due date: (per Canvas) points possible: 40 Background: As the work of Civil Engineers relates to the planning, constructing, maintaining, and effects of infrastructure and other built components, it is necessary to have an understanding of certain aspects of our natural world. This is important in order to be aware of how such components are Engineered to operate in the world. Chapter 2 of the course text provides initial insight into aspects of the natural world and highlights how Civil Engineers may have to consider such aspects. Task: Using the last 4 digits of your student ID, identify the Geotechnical Report that you are assigned to according to the “assignment list” document attached to the homework assignment. Then, use the appropriate Geotechnical Report – numbered 1 through 5 – to answer the following questions. (If a question is identified as “n/a” for your report, you may leave that answer blank without penalty.) Submittal: Report #4 1. Who is the Geotechnical Engineer responsible for the report? (This is not to be confused with the Engineering Geologist but may be a registered Civil Engineer and not a "Geotechnical".)? The Geotechnical Engineer responsible for report #4 is Juan A. Vidal 2. What is the scope of proposed development work? (This is not asking for the scope of efforts expected of the Geotechnical Engineer. Instead, please give a brief description of what the client will ask a contractor to build/repair/etc.)? The client is asking for geotechnical information for residential improvements to include a 2-story addition to the existing 1-story residence of the client.

3. Describe the on-site exploratory efforts accomplished by the Geotechnical Engineer. (In other words, tell me the extent of what they did at the site to gather their information.) The Geotechnical Engineer did a review of previous investigations performed by the offices in the vicinity, explored the subsurface which consisted in one hollow stem auger boring, detailed logging of the boring, testing sample collection in the laboratory of the boring, engineering interpretation of site conditions, and they also prepped reports with maps and other graphics to present the findings and recommendations for the improvement. 4. Did the Geotechnical Engineer accomplish any additional research in his analysis efforts? In the additional consulting part of the report the Geotechnical Engineer talks about how the foundation reviews, grading reviews, meetings, response to the review sheets, etc., will be on time and expense basis. 5. What comments are made within the report concerning the presence of groundwater under the site? [This question is n/a for Report #2.] The comments that were made concerning the presence of groundwater under the site was that the depth of it was about 8 feet below the existing ground surface. The Geotechnical Engineer also talks about how the ground water level may fluctuate because of seasonal changes, due to the natural causes. 6. Considering exposure to seismic phenomena, indicate the nearest fault(s) to the site as reported. [This question is n/a for Reports #2 and 4.] N/A 7. An important value used in seismic design calculations, identify the value of "SDS" as contained within the report. The engineer said that it was necessary for the contractor to provide shoring and safety equipment as required by the State or Federal OSHA regulations, also if excavations are during rainy seasons there should be extra care given to the berms or other devices from preventing surface water from flowing over the top of the excavation or ponding at the top of the excavations. 8. What is the allowable bearing pressure (and corresponding minimum depth) of the soils supporting shallow foundations? (This tells us how much we can push down on the soil before it fails.) The allowable bearing pressure has the capacity footing for found fill or natural soils of a maximum of 2500 lbs./sq.ft. , the recommended soil bearing pressure may be increased by one-third when designing for wind and seismic force.

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