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Questions and Answers
What is the primary purpose of the Standard Penetration Resistance Test during borehole drilling?
What is the primary purpose of the Standard Penetration Resistance Test during borehole drilling?
What depth does the sampler need to be driven to before measuring the N value?
What depth does the sampler need to be driven to before measuring the N value?
How is the 'N' value determined during the Standard Penetration Resistance Test?
How is the 'N' value determined during the Standard Penetration Resistance Test?
What is a consideration when planning borehole spacing for a project?
What is a consideration when planning borehole spacing for a project?
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Which factor directly impacts the bearing capacity of soil according to the N value?
Which factor directly impacts the bearing capacity of soil according to the N value?
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What is the primary advantage of Cone Penetration Testing (CPT) over traditional borehole methods?
What is the primary advantage of Cone Penetration Testing (CPT) over traditional borehole methods?
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What type of sampler is used in the Standard Penetration Resistance Test?
What type of sampler is used in the Standard Penetration Resistance Test?
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What is one of the key records included in borehole logs?
What is one of the key records included in borehole logs?
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What is a key advantage of Cone Penetration Testing (CPT) compared to borehole drilling?
What is a key advantage of Cone Penetration Testing (CPT) compared to borehole drilling?
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Which of the following is true about the speed of Cone Penetration Testing (CPT)?
Which of the following is true about the speed of Cone Penetration Testing (CPT)?
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What factor makes borehole drilling more time-consuming than Cone Penetration Testing (CPT)?
What factor makes borehole drilling more time-consuming than Cone Penetration Testing (CPT)?
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Why can Cone Penetration Testing (CPT) be considered more cost-effective than borehole drilling?
Why can Cone Penetration Testing (CPT) be considered more cost-effective than borehole drilling?
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What is a disadvantage of borehole drilling in relation to soil sample integrity?
What is a disadvantage of borehole drilling in relation to soil sample integrity?
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How does the accuracy of Cone Penetration Testing (CPT) compare to borehole drilling?
How does the accuracy of Cone Penetration Testing (CPT) compare to borehole drilling?
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Which soil condition is particularly challenging for borehole drilling?
Which soil condition is particularly challenging for borehole drilling?
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What is the impact of sample transportation on borehole drilling's lab testing?
What is the impact of sample transportation on borehole drilling's lab testing?
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Why must additional geotechnical testing be performed by the site superintendent?
Why must additional geotechnical testing be performed by the site superintendent?
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What is one responsibility of the site superintendent regarding the geotechnical report?
What is one responsibility of the site superintendent regarding the geotechnical report?
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What does compliance with the geotechnical report during the building permit process ensure?
What does compliance with the geotechnical report during the building permit process ensure?
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Which limitation is commonly found in a geotechnical report?
Which limitation is commonly found in a geotechnical report?
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What must city staff do during the review process of the geotechnical report?
What must city staff do during the review process of the geotechnical report?
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What should the site superintendent be particularly vigilant about during grading and excavation?
What should the site superintendent be particularly vigilant about during grading and excavation?
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Which of the following is NOT a type of pavement mentioned in the recommendations?
Which of the following is NOT a type of pavement mentioned in the recommendations?
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What action will city staff take if the geotechnical report's guidance is not adequately addressed?
What action will city staff take if the geotechnical report's guidance is not adequately addressed?
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What is the primary purpose of conducting an ESA Phase 1 investigation?
What is the primary purpose of conducting an ESA Phase 1 investigation?
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Which stage of the Environmental Site Assessment involves implementing remedial measures?
Which stage of the Environmental Site Assessment involves implementing remedial measures?
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Which of the following is NOT a method used in the ESA Phase 1 investigation?
Which of the following is NOT a method used in the ESA Phase 1 investigation?
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What information is typically gathered during a Phase 1 assessment?
What information is typically gathered during a Phase 1 assessment?
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Which aspect is NOT typically part of the visual inspection in ESA Phase 1?
Which aspect is NOT typically part of the visual inspection in ESA Phase 1?
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What would trigger the necessity to proceed to ESA Phase 2?
What would trigger the necessity to proceed to ESA Phase 2?
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Why might banks require an investigation prior to financing a property?
Why might banks require an investigation prior to financing a property?
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What is the primary purpose of conducting soil chemical analysis at sites that do not require a Phase II site investigation?
What is the primary purpose of conducting soil chemical analysis at sites that do not require a Phase II site investigation?
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Which of the following is a special attention item in ESA Phase 1?
Which of the following is a special attention item in ESA Phase 1?
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What must soil conform to in order to be used on a specific site according to the chemical analysis report?
What must soil conform to in order to be used on a specific site according to the chemical analysis report?
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What must a site do if soil is to be disposed of?
What must a site do if soil is to be disposed of?
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If the existing soil at a site does not meet the prescribed table requirements, what are the potential actions that can be taken?
If the existing soil at a site does not meet the prescribed table requirements, what are the potential actions that can be taken?
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Why is it important to compare chemical analysis results against the MOE tables?
Why is it important to compare chemical analysis results against the MOE tables?
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What triggers the need for ESA Phase 3 investigation?
What triggers the need for ESA Phase 3 investigation?
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What consequence can arise from improperly managing soil disposal at a contaminated site?
What consequence can arise from improperly managing soil disposal at a contaminated site?
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What implications can the adherence to soil table regulations have on contractors?
What implications can the adherence to soil table regulations have on contractors?
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Study Notes
Geotechnical Investigations
- Borehole Drilling is a common method to collect soil samples for analysis.
- Borehole Logs are detailed records of soil types, penetration resistance values, and moisture content.
- Standard Penetration Resistance (N-value) is used to estimate soil strength (bearing capacity) during borehole drilling.
- N-value is measured by driving a split-barrel sampler into the soil with a hammer.
- Higher N-values indicate greater soil bearing capacity.
- Number of Boreholes and spacing is determined by the project scope and expected soil variations.
- Cone Penetration Testing (CPT) is a modern alternative to borehole drilling, providing a continuous profile of soil properties.
- CPT involves pushing a cone-shaped penetrometer into the ground at a constant rate and measuring resistance.
- Borehole Drilling provides information at specific depths, while CPT offers a continuous profile, allowing for detailed profiling.
- CPT is generally more cost-effective and faster than borehole drilling.
- CPT provides more accurate and precise data compared to potentially inaccurate borehole samples.
Geotechnical Report Recommendations
- The Geotechnical Report provides recommendations for pavement types, thicknesses, and compaction equipment based on soil conditions.
- Municipalities review geotechnical reports for project approval, ensuring adequate investigation scope and implementation of recommendations in design.
- Site Superintendents must be vigilant during grading and excavation works, as significant soil variations can occur.
- Additional Geotechnical Testing is crucial to confirm bearing capacity at various locations before placing footings.
- Site Superintendents should coordinate with geotechnical consultants during construction for review and inspection.
Environmental Site Assessment (ESA)
- ESA aims to identify and assess potential environmental contamination on a site.
- Financial Implications of site contamination include loss of property value and remediation costs.
- Prospective Purchasers can use ESA to avoid unforeseen financial liabilities.
- ESA is often required by banks to ensure no hidden contamination liability exists.
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ESA is conducted in three phases:
- Phase 1: Visual investigation without sampling.
- Phase 2: Detailed investigation based on sampling and laboratory analysis.
- Phase 3: Remedial measures and Remedial Action Plan (RAP).
- Phases must proceed sequentially, with further phases triggered by the recommendations of prior phases.
ESA Phase 1
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Phase 1 investigates visible signs of past or present contamination through:
- Site Inspection: Observing property use, hazardous materials, unidentified substances, storage tanks, odors, and other signs.
- Review of Historical Databases: Obtaining information about past and present site uses.
- Interviews: Gathering information from relevant persons.
Soil Chemical Analysis
- Chemical Analysis determines the quantity of each chemical constituent of soil by testing samples in a laboratory.
- Certificate of Analysis (CoA) is a tabular form summarizing the chemical analysis results.
- MOE Tables are used to compare the chemical analysis results with permissible contaminant levels for different land uses.
Onsite Soil Management
- MOE Guidelines determine the relevant MOE Table based on current and intended uses of the site.
- Soil Conforming to the MOE Table is permissible for onsite use.
- Non-Conforming Soil must be remediated, replaced, or disposed of at a designated dump site.
- Imported Soil must also comply with the applicable MOE Table for the site.
ESA Phase 3
- Phase 3 is triggered when Phase 2 identifies contamination and remediation is required.
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Description
This quiz covers the fundamental aspects of geotechnical investigations, focusing on borehole drilling techniques and cone penetration testing. Key concepts such as borehole logs, the N-value, and soil sampling methods will be explored. Assess your understanding of soil properties and testing methods used in geotechnical engineering.
