Worksheets400
Total questions: 34
Worksheet time: 17mins
What is the difference between the DOD and AF Assessment Models?
There is no difference.
The AF model is an “iterative” approach.
The DOD model does not include a control plan.
Each process is designed to yield different results.
Which would it be prudent to accomplish if the time weighted average (TWA) is already above the occupational and environmental exposure limit (OEEL)?
Resample and recalculate TWA.
Compute the compliance factor.
Calculate the lower confidence limit (LCL).
Re-calculate the upper confidence limit (UCL).
If any of your sampling equipment was contaminated it could cause
Invalid sampling results.
Skin contact hazard to the user.
Damage to the sampling equipment.
No problem as long as the contamination was minimal.
Which of these is not a consideration when comparing analysis results to a standard?
Ensure the correct laboratory analysis method was conducted.
Ensure the results are compared to the correct type of standard.
Ensure all individuals potentially affected are listed in supportive documentation.
Ensure the correct units of measurement for sample and standard are being used.
When comparing your sample results to a standard, what is the generally accepted practice?
Use the most current Environmental Restoration Program (EPA) standard.
Use the most current Occupational Safety and Health Act (OSHA) standard.
Use the most current standard listed in the Threshold Limit Value (TLV) Booklet.
Use the most current and stringent occupational and environmental exposure limit (OEEL).
When considering the type of analysis and sampling goal for environment health data, what strategy is used for identifying changes over time?
Collect multiple samples at a single location over time.
Collect multiple samples over an area.
Develop a time series plot.
Develop a scatter plot.
Which is not an AFI 48-146 guideline for performing exposure screening assessments?
Documentation is not necessary.
A minimum of three samples is recommended.
Samples should be taken on three different days.
Samples should be random, collected over time, and from different workers.
Fluid transfer is best accomplished using
Pasteur pipet.
40 ml glass vial.
Cubitainer sampler.
Whirl-Pak sample bag.
Which statement describes grab sampling?
Sample collected over a period of time.
Instantaneous sample to provide quick estimate.
Samples must be analyzed by a certified laboratory.
Samples taken to demonstrate compliance with health standards.
When collecting potable water samples for bacteriological analysis, you should adhere to all of the following guidelines except which one?
Never hold the bottle by the neck.
Always used good personal hygiene.
Never lay the bottle down on the ground.
Always flush out the bottle before taking the sample.
Which phrase most accurately describes the American Industrial Hygiene Association (AIHA) Exposure Model?
Does not establish controls for exposures.
The AIHA model strives for continuous improvement.
The AIHA model is very different from the AF model.
The AIHA model is best used as an initial assessment.
Why do you need to use caution when using reagents to decontaminate sample equipment?
Reagents can damage the soil if not collected after use.
Reagents can leave residue on the sampling equipment.
Reagents must be stored separate from any non-compatible materials.
Reagents can cause inhalation hazards if not used in a well-ventilated area.
What is the major concern when sampling for volatile organic compounds?
Ensuring the sample is analyzed within 24 hours of collection.
Properly preserving the sample at the collection site.
Minimizing air contact with the soil sample.
Collecting the correct amount of soil.
The reason you need make sure historical data and recent data are obtained and analyzed in the same manner for trend analysis is to
identify inaccurate conclusions.
increase the standard deviation.
assure accurate, comparative results.
identify the Occupational and Environmental Exposure Limit (OEEL).
When performing a detector tube system check, how long should you wait after squeezing the pump to look for the end of stroke indicator?
Five minutes.
10 minutes.
15 minutes.
40 minutes.
What type of sampler is best suited to collecting a water sample at various levels of a large tank containing an unknown liquid?
Bacon bomb.
Long pipette.
Handheld dipper.
Plastic polypropylene line glass jar attached to a rope.
When should gas and vapor meters be field calibrated?
Monthly.
After use.
Before use.
Before and after use.
What key indicators are measured by indoor air quality monitors?
Contaminants, saturation, and air flow.
Flammability, volume, and conductivity.
Compound(s), density, and metallic oxide.
Temperature, relative humidity, and carbon dioxide.
What type of sampling strategy would be used to investigate large sites that encompass a number of soil types, topographical features, or land uses?
Hot spot.
Simple random.
Systematic grid.
Stratified random.
Water sample result interpretation is conducted by
conducting a thorough QA/QC process.
comparing results to a selected standard.
comparing current results to previous survey(s).
using your chain of command for their decision.
Which statement best describes chain of custody?
Samples must be verified prior to analysis.
Samples must be traceable from collection through analysis.
Samples should be redundantly labeled according to 49 CFR Part 172.
Samples should be sent by standard United States Postal Service (USPS) mailing procedures.
After the results from mass/volume concentration air sampling are received you find the results are reported in grams. Before you can use the formula to determine mass/volume concentration, you will have to convert the results reported in gram into what measure?
ml.
mg.
m2.
No conversion required.
A 15-minute time weighted average (TWA) short-term exposure limit is known as a
Permissible Exposure Limit (PEL).
Short-term Exposure Limit (STEL).
Excursion Limit.
Ceiling Limit.
Drinking water with a high pH level (above 8.5) indicates to you the water
is soft.
is corrosive.
is a health risk.
can cause aesthetic problems.
What type of sampling is being conducted if a technician is using a HAPSITE to sample at a specific time?
Area
Grab
Swipe
Active
In addition to being a required mandate, sampling is performed to
Provide accurate documentation for reporting in DOEHRS
Comprehensively complete a Conceptual Site Model (CSM)
Increase confidence in characterizing and controlling potential threats
Provide information to fill the “gaps” inherent in HRA data gathering.
Sampling holding times, preservatives, and collection tool hygiene are things that a technician should be aware of when conducting which type of sampling?
Integrated
Passive
Area
Grab
What action should be taken before collecting any surface or subsurface soil samples?
Separate the area to be sampled into grids
Clear the sampling area of any debris
Have your sample containers ready
Clear your sampling device
When developing an occupational exposure strategy, the purpose of evaluating existing controls is to
Determine workforce size
Determine if they are effective
Determine the maximum risk employee(s)
Acquire funding for additional Personal Protective Equipment (PPE)
If air sampling showed that a worker is exposed to concentrations of 35 ppm xylene (OEEL, 100 ppm), 20 ppm methyl chloride (OEEL, 50 ppm), and 25 ppm perchloroethylene (OEEL, 50 ppm), if these chemicals have a similar toxicological effect what would be their total atmospheric concentration?
45 ppm
80 ppm
200 ppm
280 ppm
What item must be field checked but cannot be calibrated?
Toxic gas monitors
Personal sampling pumps
Hand-held sampling pumps
Combustible gas monitors
The goal of a case-control epidemiological study is to
Estimate the expected death rate for a given disease
Evaluate the effectiveness of controls for an agent
Understand whether exposures increased the risk of a disease
Define the physiological mechanisms between the agent and the body
When should you take pH and chlorine measurements of the base swimming pool?
Before anyone enters the pool
Doing minimum load conditions
During the busiest time of the day
Wen requested by the swimming pool facility manager
The purpose of calibrating water sampling and analysis equipment is to
Collect as many samples as possible for each water source
Know how the water sampling equipment should be operated
Ensure accurate results from drinking water sampling
Determine ranges for water contaminants
