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MEC 209
Spring 2019
Hw:Lecture 3
Prof. Rafea Al Suhili LaGuardia Community College Lecture 3 Hw: Q1) What are the two main reasons for site characterizations
The two main reasons for site characterizations are to collect geologic and geotechnical data for engineering design and analysis. Also to Define reasonably the amount of construction work needed so that changes during construction will be minimized.
Q2) Why we do subsurface investigations for a proposed construction site Subsurface investigations are crucial for proposed construction sites as they provide vital
information for various aspects of the project. These investigations help determine the soil's bearing capacity, aiding in the design of stable foundations and allowing for accurate settlement predictions. Understanding site-specific soil properties enables tailored construction techniques and helps with excavation and fill calculations. Identification of groundwater conditions and geotechnical hazards such as landslides or sinkholes is essential.
Q3) When the designer should assume a specific method for soil excavations
When a cost estimation is needed for the excavation.
Q4) Is it true that pump well dewatering system is more adequate for excavations in clay foundation, explain
A pump well dewatering system is often more suitable for excavations in clay foundations due to the low permeability of clay soils. Clay's cohesive nature and slow drainage can lead to water accumulation during excavations, posing risks of instability and heaving. The pump well system involves wells with pumps strategically placed around the excavation site to actively remove water, effectively controlling the water table and preventing waterlogging. Q5) State the reasons for researching a prior usage of project site
To clear the site for any potential cultural or archaeological resources that are of value.
To investigate the potential of environmental contamination and hazardous waste.
To identify any buried structures that would affect the design and construction of the project.
Q6) Define GPR, NEPA, and NGVD
GPR, stands for Ground Penetration Radar. GPR is a geophysical method that is used to identify buried objects.
NEPA, stands for National Environmental Policy Act. NEPA take care of the preservation of natural resource. This becomes an important consideration in the permitting, layout, and design of most civil engineering projects.
NGVD, stands for National Geodetic Vertical Datum. Sometimes, survey controls are already established on site from previous work or from known benchmarks, and they
MEC 209
Spring 2019
Hw:Lecture 3
Prof. Rafea Al Suhili LaGuardia Community College should be used for all project survey work, so that the existing and new features can be compared in the same space.
Q7) For Fig 3-1 in lecture 3 locate point E485,100 and N1,510,700
Q8) for Fig. 3-2 lecture 3, find a- Distance between Benchmarks 1 and 2: The answer is about 112 f
b- Elevation of point E10,200 and N9900: The answer is 2165 f.
Q9) What information that the title block of a construction drawing should contain
Project identification
MEC 209
Spring 2019
Hw:Lecture 3
Prof. Rafea Al Suhili LaGuardia Community College
Sheet identification
Revision number/block
Designer and owner identifications
Responsible personnel identification
Q10) Explain the meaning of STA 6+21.0, and define offsets
The meaning of STA 6+21.0 is a point on the centerline that is 621.0 feet from an
arbitrary zero reference point (station 0+00).
Offsets are distances measured perpendicular to the baseline or centerline. Q11) state the types of drawings views that should exist in construction drawings
Plan view.
Section view is also called a cross section.
Elevation view.
Profile view.
Q12) explain the use of hidden lines and long break lines The hidden line is used for physical boundary of a feature not directly visible or covered in a particular view.
The long break lines are used to isolate only portion of a feature instead of showing the entire feature.
Q13) sketch the six principle views of the following 3-d body use the attached grid paper(use one paper for each of the six views)
MEC 209
Spring 2019
Hw:Lecture 3
Prof. Rafea Al Suhili LaGuardia Community College
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