5. In Table Z-1 of the list of air contaminants regulated in 29 CFR 1910.1000 (General Industry standard), what is the 8-hour Permissible Exposure Limit (PEL) in parts per million (ppm) for a worker exposed to acetone on a production line:

What is the overall efficiency for the removal with the fabric filter for a distribution of particles where 0.05% of the particles are of 0.1 microns diameter, 0.2% of particles are of 0.3 microns diameter, 2.8% of the particles are 0.7 microns and remaining particles are in the particle diameter range of 1 to 50 microns.

Suggestions please.

Land use and transport infrastructure relationship: what method(s) and factors (variables) to be considered when measuring accessibility of activities (education, hospital, shopping mall, employmeny, etc) in regional (suburb) and urban areas using transport network (railway).

Determine the saturation flow rate for a left-turn lane that operates in a protected/permitted mode, under the following conditions: Opposing demand flow rate = 1100 veh/h Lane width = 11 ft Heavy vehicles = 3% of the traffic stream Approach grade = –2% No on-street parking No bus stops Bicycle and pedestrian traffic conflicting with this lane group is negligible Intersection is not in a central business district.

Problem 2:
Initial mixture proportions for a concrete with the following requirements and properties is needed:
28 Day Design Strength = 4000 psi
It is for a parking lot deck and columns, so it is not in contact with sulfates from soil or saltwater
Slump should be 4”
Aggregate properties are:
Coarse Fine
SGSSD 2.60 2.55
Absorption (%) 0.8% 1.9%
Fineness Modulus N/A 2.90
Nominal Size ¾” x #8 N/A
Dry Rodded Unit Weight (lbs/ft3) 91.3 N/A
Description Rounded Gravel N/A
No reliable records for the relationship between w/c and compressive strength are available for the
specific cement and aggregate combination being used, so use Table 12-3 or Figure 12-3 for the
relationship between compressive strength and w/c.
Not using any chemical admixtures other than air-entrainment, determine the mixture proportions (per yd3
of concrete with aggregates in the SSD state if the freeze/thaw exposure classification is
a) Class F0 (not exposed to freezing and thawing, but use a minimal amount to improve workability
or just in case it is exposed to frost once in awhile…for example San Luis Obispo)
b) Class F3 (exposed to freezing and thawing while wet and exposed to de-icing chemicals…typical
of a parking structure in New York, Minnesota, Illinois, Indiana, Massachusetts, etc.)
c) Compare your proportions for the two, and what governed the w/c?

A rectangular footing (0.75m∙0.75m), embedded 0.5 m, carries a downward column load of 200 kN. The footing is supported on an overconsolidated clay with the following properties:

Cr = 0.05         e = 0.7             OCR = 2.0

PI = 55            cu = 200 kPa ϒsat = 16.2 kN/m3

The ground water table is at a depth of 1.0 m below the ground surface.

a) Calculate the primary consolidation settlement for this footing.

b) Is the calculated Sc within tolerable limits?

Hint: This clay deposit is very deep. Assume that the portion (or thickness) of the clay layer that will consolidate is between z = Df and z = Df + 2B.

§Problem 1: Two meters of fill (=2.04 Mg/m3) are compacted over a large area (thus 100% of its influence is felt throughout the depth). Above the compacted fill, a 3*4m spread footing loaded with 5000 kN is placed. Assume that the average density of the soil is 1.68 Mg/m3, and the water table is very deep. Then it is required to (a) compute and plot the profile of effective vertical stresses at the middles of five 2m intervals or layers of depth, prior to fill placement. (b) compute and plot the stresses at the same intervals due to adding the fill. (c) compute and plot the stresses with depth due to the addition of 3*4 m footing, using the equations below, for the increase in stresses below the corner of a rectangular area of width B and Length L. (assume that, the weight of footing plus backfill equals weight of soil removed).

§Problem 2 For the previous problem. It was assumed that the settlement of the footing would occur from settlement in the 2m fill below the footing and the 10m layers of medium sand. Consider that, the values of E and ν are 20 MPa and 0.3, respectively, (for both materials). Assuming a linear, isotropic, elastic material behaviour, calculate and plot The Total Elastic Settlement Profile.

Assessment 4.0: Management of Quality

Produce a report (min 300 words) detailing construction methodology and the process for the management of quality of installation and progress reporting for either of the following:

• Plain line track renewals
• S&C Installation

Include in the report an outline the management of quality of high output techniques for the following:

• Plain line track renewals
• Ballast cleaning
• S&C Modular Installation methods

Also include the management of quality of track renewals process for special circumstances including:

• Tunnels
• Viaducts
• Other local areas of specific constraint (if appropriate)

You are assigned to design the decision table of the year-end bonus. Everyone has a basic amount of $500. Anyone who worked for over 5 years would have an addition $2000. Anyone who got top sales at any month during the year would have an extra $1000. However, if anyone who got a warning from the company would drop all the bonuses. Draw the decision table based on the above information.

Question 5 (5 + 3 + 2 Marks)
a) What is unified classification of soil? Explain the classification and
nomenclature of Gravels, Sands, Silts and Clays.
b) Explain well-graded, poorly graded and gap-graded soil showing the graph
between percentage passing and grain size.
c) The grain size analysis was conducted and following results are obtained from
graph. The d 10 = 0.15, d 30 =0.425 & d 60 =1.5. Determine the grading of the soil.

A rectangular laboratory channel has a bottom width of 6.0 in, a Manning roughness coefficient of n = 0.010, longitudinal slope of 2% (So = 0.02). The discharge is 180 gpm. Assume α = 1. The water depth is 2.5 inches at Point A, and 3.0 inches at Point B. The normal depth is 2.066 in and critical depth is 3.228 in.

(a) Use the direct step method with one step (Δy = 0.5 in) to determine the distance from Point A to Point B. Do this by hand, using a calculator. Show all work.

(b) Which point is upstream, A or B? Explain the reason for this answer.