Proctor Information for IENG 431/531 Industrial Hygiene Exam

This article provides all the necessary information for serving as a proctor for IENG 431/531 Industrial Hygiene Exam. It includes details about the time limit, rules, and regulations for the exam. Contact details of the instructor are also provided. The article also includes solved questions related to the exam.

Proctor Information
IENG 431/531 – Industrial Hygiene
Instructor: Dr. Carter Kerk
 Thank you for your willingness to serve as a proctor for a student in my course. We both appreciate you!
 Please print one copy of the exam and then delete the file when completed.
 The time limit is 50 minutes.
 Closed Book
 Closed Notes
 No computer access. Computer must be stowed far out of reach and out of sight.
 No phone of any kind or computer watch. Phone must be stowed far out of reach and out of sight.
They may not have a phone in a pocket, include coat pocket, in a purse or bag within reach, etc.
 If you spot a phone or computer, they fail the exam. The students know this.
 Calculator allowed as follows. The students know this.
o Casio: All fx-115 and fx-991 models (Any Casio calculator must have “fx-115” or “fx-991”
in its model name.)
o Hewlett Packard: The HP 33s and HP 35s models, but no others
o Texas Instruments: All TI-30X and TI-36X models (Any Texas Instruments calculator
must have “TI-30X” or “TI-36X” in its model name.)
 When completed, my preference is for you to mail (US Mail) the exam (without appendices) to
 Carter Kerk, IE Dept, SDSMT, 501 E St Joseph St, Rapid City, SD 57701
 Please print and sign your name across the seal.
o If this is not convenient, I will accept a legible electronic copy of exam (without appendices) to
 [e-mail]
 Save the original until you receive confirmation, then shred
 If you have any questions, please contact me at
o [e-mail]
o Cell: 605-415-5801
 Thank you!
Revision: 2/13/20

IENG 431/531
Industrial Hygiene
Exam I
100 Points
February 19, 2020
Time Limit: 50 minutes
Name (print): (XC 0.5)
I understand and am in compliance with the Academic Integrity Policy. (This means you will not and did not cheat.)
Signature (XC 0.5)
Show your work and state your assumptions. Multiple-choice questions may have more than one correct answer. Closed book. Closed
notes. No crib sheets. Approved calculators are allowed. Be sure to familiarize yourself with the reference materials at the end of the
exam. Do not discuss this exam with anyone other than the instructor or other students who have also completed this exam.
1. IH Pioneer Matching. I’m giving you one to get started. [9]
IH Pioneers Code Description
A) Alice Hamilton A An occupational physician that helped foster the credibility of the field of industrial
hygiene in the early 1900s.
B) Bernardino Ramazzini F Created the Mad Hatter character in “Alice in Wonderland” as one with mercury
poisoning from the leather processing industry in 1865.
C) Georgius Agricola Described mercury poisoning of miners in 1587. Stated, “All substances are poisons,
there is none which is not a poison. The right dose differentiates a poison and a
remedy”.
D) Herbert & LH Hoover K Linked “Devonshire colic” to lead in cider around 1770.
E) Hippocrates H Linked soot exposure and scrotal cancer in chimney sweeps around 1770.
F) Lewis Carroll C Published a 12-volume set in 1556 called “De Re Metallica”. Described diseases of the
lungs, joints, and eyes in silver miners.
G) Paracelsus J Recorded zinc and sulfur hazards in 3rd century BC.
H) Percival Pott E Studied lead poisoning among miners in 4th century BC.
J) Pliny the Elder D Translated De Re Metallica from Latin to English and published it in 1912.
K) Sir George Baker B Wrote the book, “Diseases of Workers”, starting the field of occupational medicine.
Urged physicians to ask of their patients, “Of what trade are you?”

760
mm
Hg
758
mm
H
IN8PIRATI
DN
2. Use letters A, B, C, D, E, F, G, and H to correspond to the features in the diagram. Full credit if you
mix up the intercostals, extra credit if you don’t. [8 + 2XC]
Air
Flow:H
Diaphragm
:E
External
Intercostals:F
Internal
Intercostals :G
Rib & Costal
Cartilage: B
Sternum:C
Thoracic Vertebrae:D
Thoracic Wall: A

3. Use letters A, B, C, D, E, F, G, H!, H 2
, R, S, T, and U to correspond to the features in the diagram. [13]
Absorptive Cell:H2
Artery:R
Ascending (4th )
Part of Duodenum Capillary: E
Descending (2nd)
Part of Duodenu:C
Duodenum-A
Horizontal (3’ d )
Part of Duodenum: D
Ileum:G
Jejunu:F
Nerve:
U
Superior (1”) Part of Duodenum: B
Vein
:T
Villi:
H1

4. Air samples for a worker’s exposure to styrene on the day of sampling were found as follows. Evaluate with respect to the
appropriate OSHA regulation. Show all your work. [8]
Sample Measured Amount (ppm) Duration of Sample (min)
1 5 45
2 10 60
3 22 75
4 58 90
5 114 120
6 270 90
For sample 1, calculated time in hour (45/60) = 0.75 hours
For sample 2, calculated time in hour (60/60) = 1 hours
For sample 3, calculated time in hour (75/60) = 1.25 hours
For sample 4, calculated time in hour (90/60) = 1.5 hours
For sample 5, calculated time in hour (120/60) = 2 hours
For sample 6, calculated time in hour (90/60) = 1.5 hours
C1T1 = 5ppm*0.75 hours = 3.75
C2T2 = 10ppm*1 hour = 10
C3T3 = 22ppm*1.25 hours = 27.5
C4T4 = 58ppm*1.5hours = 87
C5T5 = 114ppm*2hours = 228
C6T6 = 270ppm*1.5hours = 405
8 hours TWA for exposure to styrene= (C1T1+ C2T2+ C3T3+ C4T4+ C5T5+ C6T6)
= (3.75+10+27.5+87+228+405)/8
=761.25/8
= 95.16ppm
As per the OSHA, the maximum limit of 8 hours TWA for exposure to styrene is 100 ppm. However as per the above assessment
the TWA of 8 hours is 95.16ppm, which is acceptable
5. A process involves worker exposure to a mixture of the following materials at the given levels averaged over 8 hours.
Assume these agents synergistically affect a target organ. Evaluate with respect to the appropriate OSHA regulation. Show your
work. [8]
Agent 8-Hr Measured TWA
Acetone 400 ppm
Ammonia 28 ppm
Ethylene dibromide 8 ppm
PEL for Acetone PEL1= 1000ppm
PEL for Ammonia PEL2=50 ppm
PEL for Ethylene dibromide PEL3= 50ppm
Hence, PPL of mixture= (C1/PPL1)+ (C2/PPL2)+ (C3/PPL3)
= (400/1000)+(28/50)+(8/50)
=1.12
The worker’s exposure exceeds 1.0 and therefore the OSHA PEL for the mixture of these three material also exceeded.

6. Identify these acronyms. Extra credit given for perfect spelling. [8]
 ACGIH- American Conference of Governmental Industrial Hygienists
 AIHA- American Industrial Hygiene Association
 IDLH- Immediately dangerous to life or death
 NIOSH The National Institute of Occupation Safety and Health
 PEL- Permissible exposure limit
 PPE- Personal Protective Equipment
 REL: Recommended Exposure Limit
 TLV- Threshold limit value
7. As discussed in class, our prioritized strategy for dealing with hazards is as follows. I’m giving you one to get started. [5]
1. Identification
2. Evaluation
3. Control
3.1 To engineer out the hazards
3.2 Implement administrative controls
3.3 Provide protective equipment
8. Name the three types of OSHA regulation variances and describe one. (4)
Three types of OSHA regulation variances include temporary variance, permanent variance and experimental variance. Permanent
variance is the condition when an employer has an alternative method or practice which is as safe as the standard method
9. Name two specific biological agents. (4)
Two specific biological agents include bacteria and fungi

10. Define and describe medical surveillance. (5)
Medical surveillance is described as the systematic process of evaluation of employees to assess whether they are exposed to any
health hazards within their scope of practice or not. The main intention is to identify risk of adverse health due to exposure to any
hazardous materials. The ultimate goal is to prevent occupational illness and injury.
11. Sketch and label the Dose-Response Curve. [6]
The graph above is showing dose response relationship using simple dose response relationship. Dose is recorded for any toxic agent
and response is given for any exposed organism.
12. Write a complete, detailed sentence that fully describes this: LD50, 14 mg/kg, skin, mouse, morphine sulfate. [6]

LD50 is a term used to denote the toxicity of various materials. LD50 is defined as the amount of substance needed to produce death in 50% of
the exposed population. The above words in the question can be framed in the following ways:
Morphine sulphate has an of 14mg/kg of body weight when administered orally to mouse

13. The OSHA Act was passed by the US Congress and signed into law by President Richard Nixon in the year 1970 . [2]
14. The delay between the exposure to a toxin and the disease caused by the toxin is called the latency period . [4]
15. Name five routes of entry for toxins into the body. Label the undisputed #1 and #2 routes. [7]
 Oral
 Subcutaneous
 Intramuscular
 Intraperitoneal
 Intravenous
16. The process by which your body can convert a lipid soluble substance to a water-soluble substance is called
Lipid solubity . The primary organ for this process is the liver . The primary organ
for elimination of water-soluble substances is the kidney . [3]
17. List the four ways toxins move through the body. Describe two in detail with sketches [XC 8]
1. Inhalation
2. Ingestion
3. Absorption
4. Injection
Inhalation is the major route of entry for most chemicals and after inhalation, toxins are deposited in the respiratory tract. Damage can occur
through direct contact or via the diffusion of the toxin into the blood through the livers. Contact with tissue may lead to adverse effects like
irritation, whereas distribution through blood stream can affect different organs.
Absorption of toxins may occurs through skin contact and it may lead to symptoms of redness.
Many toxins cross the skin barrier and get absorbed into the blood stream. This may lead to
adverse changes in internal organ of the body.

Some Potentially Useful Information
1 inch = 2.54 cm 1 kg = 2.205 lbs 1 liter = 0.264 gallons 1 cubic foot = 7.48 gallons
1 gallon of water = 8.35 lbs
8 Hour TWA = [(CxTx) + . . . + (CnTn)] / 8
Cx = concentration measured during time interval Tx
n = total number of intervals measured
PELmixture = (C1/PEL1) + (C2/PEL2) + . . . + (Cn/PELn)
C1 = 8-hour TWA measured for substance 1
C2 = 8-hour TWA measured for substance 2
n = number of substances in the mixture
• Part Number: 1910
• Part Title: Occupational Safety and Health Standards
• Subpart: Z
• Subpart Title: Toxic and Hazardous Substances
• Standard Number: 1910.1000 TABLE Z-1
• Title: TABLE Z-1 Limits for Air Contaminants.
TABLE Z-1 LIMITS FOR AIR CONTAMINANTS
NOTE: Because of the length of the table, explanatory Footnotes applicable to all substances are given
below as well as at the end of the table. Footnotes specific only to a limited number of substances are
also shown within the table.
Footnote(1) The PELs are 8-hour TWAs unless otherwise noted; a (C) designation denotes a ceiling limit.
They are to be determined from breathing-zone air samples.
Footnote(a) Parts of vapor or gas per million parts of contaminated air by volume at 25 degrees C and
760 torr. Footnote(b) Milligrams of substance per cubic meter of air. When entry is in this column only,
the value is exact; when listed with a ppm entry, it is approximate.
Footnote(c) The CAS number is for information only. Enforcement is based on the substance name. For
an entry covering more than one metal compound measured as the metal, the CAS number for the metal
is given - not CAS numbers for the individual compounds.
Footnote(d) The final benzene standard in 1910.1028 applies to all occupational exposures to benzene
except in some circumstances the distribution and sale of fuels, sealed containers and pipelines, coke
produ ction, oil and gas drilling and production, natural gas processing, and the percentage exclusion for
liquid mixtures; for the exce pted subsegments, the benzene limits in Table Z-2 apply. See 1910.1028 for
specific circumstances.
Footnote(e) This 8-hour TWA applies to respirable dust as measured by a vertical elutriator cotton dust
sampler or equivalent instrument. The time-weighted average applies to the cotton waste processing
operations of waste recycling (sorting, blending, cleaning and willowing) and garnetting. See also
1910.1043 for cotton dust limits applicable to other sectors.
Footnote(f) All inert or nuisance dusts, whether mineral, inorganic, or organic, not listed specifically by
substance name are covered by the Particulates Not Otherwise Regulated (PNOR) limit which is the same
as the inert or nuisance dust limit of Table Z-3.
Footnote(2) See Table Z-2.
Footnote(3) See Table Z-3
Footnote(4) Varies with
compound.
Footnote(5) See Table Z-2 for the exposure limits for any operations or sectors where the exposure limits
in 1910.1026 are stayed or are otherwise not in effect.

TABLE Z-1. - LIMITS FOR AIR CONTAMINANTS
| | | |
| | | mg/m(3) | Skin
Substance |CAS No. (c) |ppm (a)(1)| (b)(1) |designation
| | | |
| | | |
Acetaldehyde...........| 75-07-0 | 200 | 360 |
Acetic acid............| 64-19-7 | 10 | 25 |
Acetic anhydride.......| 108-24-7 | 5 | 20 |
Acetone................| 67-64-1 | 1000 | 2400 |
Acetonitrile...........| 75-05-8
2-Acetylaminofluorene; |
see 1910.1014........| 53-96-3
|
|
|
40 |
|
|
70 |
|
|
Acetylene dichloride; |
see |
1,2-Dichloroethylene.|
Acetylene tetrabromide.| 79-27-6
|
|
|
| 1
|
|
|
| 14
|
|
|
|
Acrolein...............| 107-02-8 | 0.1 | 0.25 |
Acrylamide.............| 79-06-1
Acrylonitrile; |
see 1910.1045........| 107-13-1
|
|
|
........ |
|
|
0.3 |
|
|
X
Aldrin.................| 309-00-2 | ........ | 0.25 | X
Allyl alcohol..........| 107-18-6 | 2 | 5 | X
Allyl chloride.........| 107-05-1
Allyl glycidyl ether...|
|
|
1 |
|
3 |
|
(AGE)................| 106-92-3 | (C)10 |(C)45 |
Allyl propyl disulfide.| 2179-59-1 | 2 | 12 |
alpha-Alumina..........| 1344-28-1
Total dust..........|
|
| ........
|
| 15
|
|
Respirable fraction..| | ........ | 5 |
Aluminum Metal (as Al).| 7429-90-5
Total dust..........|
|
| ........
|
| 15
|
|
Respirable fraction..|
4-Aminodiphenyl; |
see 1910.1011........| 92-67-1
|
|
|
........ | 5
|
|
|
|
|
2-Aminoethanol; |
see Ethanolamine. . . .|
2-Aminopyridine........| 504-29-0
|
|
| 0.5
|
|
| 2
|
|
|
Ammonia................| 7664-41-7 | 50 | 35 |
Ammonium sulfamate.....| 7773-06-0
Total dust..........|
|
| ........
|
| 15
|
|
Respirable fraction..| | ........ | 5 |
n-Amyl acetate.........| 628-63-7 | 100 | 525 |
sec-Amyl acetate.......| 626-38-0 | 125 | 650 |
Aniline and homologs...| 62-53-3
Anisidine |
(o-,p-isomers).......| 29191-52-4
|
|
|
5
........
| 19
|
| 0.5
|
|
|
X
X
Antimony and compounds |
(as Sb)..............| 7440-36-0
|
| ........
|
| 0.5
|
|
ANTU (alpha |
Naphthylthiourea)....| 86-88-4
|
| ........
|
| 0.3
|
|
Arsenic, inorganic |
compounds (as As); |
see 1910.1018........| 7440-38-2
|
|
|
|
|
|
|
|
|
Arsenic, organic | | | |
compounds (as As)....| 7440-38-2 | ........ | 0.5 |
Arsine.................| 7784-42-1
Asbestos; |
see 1910.1001........| (4)
|
|
|
0.05 | 0.2
|
|
|
|
|
Azinphos-methyl........| 86-50-0
Barium, soluble |
compounds (as Ba)....| 7440-39-3
|
|
|
........
........
| 0.2
|
| 0.5
|
|
|
X

Barium sulfate.........|
Total dust..........|
7727-43-7 |
| ........
|
| 15
|
|
Respirable fraction..| | ........ | 5 |
Benomyl................| 17804-35-2 | | |
Total dust..........| | ........ | 15 |
Respirable fraction..| | ........ | 5 |
Benzene; See 1910.1028.| 71-43-2 | | |
See Table Z-2 for | | | |
the limits | | | |
applicable in the | | | |
operations or | | | |
sectors excluded | | | |
in 1910.1028(d) | | | |
Regulations (Standards - 29 CFR)
TABLE Z-2 - 1910.1000 TABLE Z-2
• Part Number: 1910
• Part Title: Occupational Safety and Health Standards
• Subpart: Z
• Subpart Title: Toxic and Hazardous Substances
• Standard Number: 1910.1000 TABLE Z-2
• Title: TABLE Z-2
TABLE Z-2
Substance
8-hour
time
weighted
average
Acceptable
ceiling
concentratio
n
Acceptable maximum peak above the acceptable
ceiling concentration for an 8-hr shift
Concentratio
n
Maximu
m
duration
Benzene (a)
(Z37.40- 1969)
10 ppm 25 ppm 50 ppm 10
minutes.
Beryllium and
beryllium
compounds
(Z37.29-1970)
2 ug/m(3) 5 ug/m(3) 25 ug/m(3) 30
minutes.
Cadmium
fume (b) (Z37.5-
1970)
0.1 mg/m(3) 0.3 mg/m(3) .........
Cadmium
dust (b) (Z37.5-
1970)
0.2 mg/m(3) 0.6 mg/m(3)
Carbon
disulfide
(Z37.3-1968)
20 ppm 30 ppm 100 ppm 30
minutes.
Carbon
tetrachloride
(Z37.17-1967)
10 ppm 25 ppm 200 ppm 5 min. in
any 3 hrs.
Chromic acid and
chromates (Z37-
7- 1971) (c)
.......... 1 mg/10
m(3)
Ethylene
dibromide
(Z37.31-1970)
20 ppm 30 ppm 50 ppm 5 minutes.
Ethylene
dichloride
50 ppm 100 ppm 200 ppm 5 min. in
any 3 hrs.

(Z37.21-1969)
Fluoride as
dust (Z37.28-
1969)
2.5 mg/m(3) ........... .........

Formaldehyde:
see 1910.1048
........... ........... .........
Hydrogen
fluoride
(Z37.28-1969)
3 ppm .......... .........
Hydrogen
sulfide (Z37.2-
1966)
.......... 20 ppm 50 ppm 10 mins.
once only
if no other
meas.
exp.
occurs.
Mercury (Z37.8-
1971)
.......... 1
mg/10m(3)
........
Methyl
chloride
(Z37.18-
1969)
100 ppm 200 ppm 300 ppm 5 mins. in
any 3 hrs.
Methylene
Chloride: see
1910.1052
Organo (alkyl)
mercury
(Z37.30- 1969)
0.01mg/
m(3)
0.04
mg/m(3)
.........
Styrene (Z37.15-
1969)
100 ppm 200 ppm 600 ppm 5 mins. in
any 3 hrs.
Tetrachloroethylene 100 ppm 200 ppm 300 ppm 5 mins. in
any 3 hrs.
Toluene
(Z37.12- 1967)
200 ppm 300 ppm 500 ppm 10
minutes
Trichloroethyle
ne (Z37.19-
1967)
100 ppm 200 ppm 300 ppm 5 mins. in
any 2 hrs.
Footnote(a) This standard applies to the industry segments exempt from the 1 ppm 8-hour TWA
and 5 ppm STEL of the benzene standard at 1910.1028.
Footnote(b) This standard applies to any operations or sectors for which the Cadmium standard,
1910.1027, is stayed or otherwise not in effect.
Footnote(c) Footnote(c) This standard applies to any operations or sectors for which the exposures limit
in the Chromium (VI) standard, Sec. 1910.1026, is stayed or is otherwise not in effect.