HAZ EXAM UPDATED Flashcards
What is the maximum width of a trench before a bridge is required ?
30”
What is the maximum DEPTH of a trench before a bridge is required ?
6’
You have encountered asbestos while working on site with a HAZWOPER training person, what should you do ?
contact DOSH for directions
What action should be taken prior to the transportation of a removed UST?
provide a vent hole in a tank plug
If a respirator has been contaminated and must be thrown out, what kind of waste is it considered to be ?
Hazardous waste
What is the first thing a contractor should do once his bid has been accepted for a hazardous waste removal project ?
Contact the local regulatory agencies
Why is pea gravel a preferred fill?
It does not need to be compacted
How long must a hazmat site be open before you need a shower station ?
6 months
How is radioactive waste classified ?
Mixed waste
When is a shipping manifest required for transporting hazardous material ?
A. Shipment by rail
B. Shipment by water
C. Shipment by roadway
D. Always
C. Shipment by roadway
How is pea gravel backfill protected from infiltration of fines ?
Install filter fabric between the pea gravel and soil
Which of the following is NOT recommended backfill material for steel UST installations?
A. Topsoil
B. Sand
C. Crushed Rock
D. Pea Gravel
A. Topsoil
Which of the following is NOT a recommended backfill material for nonmetallic UST installations ?
A. Peagravel
B. Crushed rock
C. Crushed gravel
D. Sand
D. Sand
When using pea gravel as backfill material for steel or nonmetallic UST installations, the largest particle should be no more than ____ in diameter .
3/4”
When using crushed rock for backfill material, the largest particle should not be more than ___ in diameter .
1/2”
What hazards apply to the removal of above-ground oil storage tanks ?
Benzene, asbestos, explosions, lead
What should the operator do if the sling for lifting a tank is found to be too horizontal to the tank top ?
Use a spreader beam
A countercurrent packed tower is used in air stripping to remove:
Volatile organic components from aqueous waste
A major disadvantage of a countercurrent packed tower is:
It has high energy cost
Gasoline vapors are lighter or heavier than air?
Heavier
During UST removal, keep the tank vented at least ___ above ground.
12 feet
During excavation for installation or removal of a UST, maintain at least ___ from the edge of the excavation to the bottom of an adjacent building foundation.
5 feet
When excavating to remove a UST, a public barricade should be erected at least _____ from the edge of the excavation.
50 feet
When excavating to remove a UST, allow at least ____ at the side and ends to leave room for a one-yard bucket.
3 feet
When excavating to remove a UST, the best type of fire extinguisher to be placed at the job site is:
40:B
When preparing a site for UST removal, you have disconnected all electrical service going to , under or through the UST area, the next step is:
Pull the breakers and confirm total interruption of power with a voltmeter
When draining the product in the piping of a UST being removed:
Drain the product back in to the tank
When draining the product remaining in the piping of a UST being removed, if the piping system is pressurized or if it is a suction-type:
Remove the check valve
When pumping liquids and residue from a UST, the main danger is:
Fresh air may enter the tank and make its atmosphere flammable
Because of the danger from static electricity during UST removal, you should:
A. Ground all pump motors and suction hoses
B. Use low air or gas pressures
C. Ground equipment to the tank as well as the earth
D. All of the above
D. All of the above
When purging flammable vapors in a UST with a diffused air blower:
Ground the diffuser to the tank bottom and to earth
When inerting ( removing/displacing oxygen) a UST with dry ice, how much is typically added per 100 gallons of tank capacity ?
1.5 to 2 lbs
True or false:
Dry ice should be stored in an airtight container
False
When inerting flammable vapors in a UST by introducing an inert gas which of the following should you not do ?
A. Introduce the gas through the tank opening at the end opposite from the vent
B. Place the supply line near the bottom of the tank.
C. Use low pressure ( below 5 psi) to avoid creating static electricity.
D. Discharge a CO2 fire extinguisher into the tank before introducing the gas.
D. Discharge a CO2 fire extinguisher into the tank before introducing the gas.
CO2 could result in an explosion if the tank contains flammable vapor-air mixtures.
A UST being removed must first be reviewed and certified clean by:
The local fire marshall
Contaminated soil removed from a UST abatement site:
Must be hauled to an approved sanitary landfill for disposal
An owner/operator of a UST temporarily closes it for 3 months to 1 year, what must they do ?
- Make sure the tank vent lines are open and functional and 2. Cap and secure all other lines, pumps, manways and ancillary equipment.
Workers are wearing protective equipment consisting of semi-permeable or impermeable suits. They should be monitored for heat stress when temperatures in the work area are above:
70 degrees
Monitoring is done mainly by measuring the heart rate and oral temp. Shorten the next work cycle if heart rate exceeds 110 bpm or if oral temp exceed 99.6 degrees F.
If a workers temperature exceed 100.6 degrees, do not allow him or her to wear semipermeable or impermeable garment.
A worker at a level-A decontamination site needs to exchange an air tank, when leaving the exclusion zone for a tank change-over, what should not be removed or left behind ?
Outer garment suit and SCBA
Where high strength is required of a subsurface barrier, the best choice is :
A pre-cast or cast-in-place concrete panel
When closing an abandoned well, the EPA requires:
A. Disconnecting the drain lines and pressure-washing them
B. Filling the drains and lines with grout or cement
C. Permanently sealing the drain lines.
D. All of the above
D. All of the above
What is the most common type of subsurface barrier?
Soil-bentonite slurry wall
Which type of slurry wall has the lowest installation cost, chemical compatibility and lowest permeability, but also the lowest strength?
Soil-bentonite slurry wall
What is the most common configuration for a soil-bentonite slurry wall?
Circumferential
You are given a set of plans for UST. The plans are drawn to scale: 1/4” per foot. If the tank measures 6-1/2” long on the plane, how long is the actual tank ?
26 ft
6.5” ÷ 0.25in/ft = 26 ft
Which of the following refers to the vapor monitoring well ?
3
Which of the following refers to the groundwater monitoring well ?
5
The depth of the groundwater monitoring well (shown at No.7) must be between ___ and ___ of the water table.
5 feet below and 30 feet below
Which of the following refers to the line leak detector ?
2
Which of the following refers to the secondary containment with an interstitial monitor ?
6
What does No.4 refer to ?
An inventory probe for automatic tank gauging.
Steps should be taken to reduce or eliminate the possibility of evaporation of volatile components from samples when sampling groundwater. Which of the following is not recommended to use for collecting groundwater samples?
A. A gas-actuated displacement pump.
B. A submersible pump
C. A Teflon or stainless steel bailer
D. Peristaltic pumps or airlift pumps
Peristaltic pumps or airlift pumps
Which of the following sampling devices is best for determining whether soil is contaminated with gasoline?
A. Soil auger
B. Veihmeyer sampler
C. Coliwasa
D. Sampling trier
B. Veihmeyer
When taking samples of free-floating product in well water, sampling on the surface of the groundwater should not be performed until the well has been allowed to stabilize for at least ___ after development or other withdrawal procedures .
24 hours
When taking samples of dissolved product in well water, the well should be purged by removing ___ well volumes by bailing or pumping after substantially removing as much product as possible.
3-4
What test are run before moving a tank ?
Oxygen and LEL
How many times do you rinse a tank before moving ?
3
If you are pulling out the tank what would you look at before starting ?
Site history
Which of the following is least toxic ?
A. Lead
B. Chromium
C. Selenium
D. Calcium
D. Calcium
In a 5-ft deep trench, you must space ladder no more than ___ apart to enable workers to get out in an emergency
50 feet
How much time do utility companies have to come out after contacting USA ?
2 business days
