1
WA UST Site Assessor Exam Questions With Complete
Solutions | 100% Pass
What is the hold time for soil and preserved GW GRO samples? - (answers)14 days
Is an ICC certification needed to install an AST? - (answers)No
Flammability limits of gasoline - (answers)1.4 to 7.6%
How many days do you have from a tank closure to report/provide the UST checklist to ECY? -
(answers)30 days
MTCA Method A lead CUL, soil - (answers)250 mg/kg
MTCA Method A lead CUL, GW - (answers)15 ug/L
Is the vadose zone saturated or unsaturated? - (answers)Unsaturated
List in order of most mobile to least mobile: Bunker C, heating oil, diesel, gasoline -
(answers)Gasoline, diesel, heating oil, Bunker C
Is oxygenated gasoline more or less likely to dissolve in water? - (answers)More likely; fuel
additives like MTBE are more soluble than gasoline
Where to sample on dispenser? - (answers)2 feet below where the piping enters the UST
Where to sample along piping? - (answers)Every 50 linear feet and along joints/elbows
, 2
How many GW samples are needed after decommissioning if a release to GW is confirmed, and
where relative to the tank? - (answers)3; 1 upgradient, 2 downgradient
What vapor is an FID used to measure? - (answers)Methane
What is a PID measuring? - (answers)Mixture of all volatiles
What conditions might impede a PID? - (answers)Moisture/humidity, dust, transformers, power
lines
What UST capacity does not require a site assessment at closure? - (answers)Less than 110
gallons
Purpose of a site check - (answers)To investigate a UST site for the presence of a release when
evidence indicated that a release may have occurred
Purpose of a site assessment - (answers)To investigate a UST site at the time of closure or
change-in-service to determine if a release has occurred
Site check vs. site assessment - (answers)A site check is an investigation of a UST site for a
release when evidence indicates that one many have occurred; a site assessment determines if a
release has occurred
If a confirmed release is identified and reported within 24 hours, what is and is not required? -
(answers)A site assessment is not required; a site characterization is required
What is the historical date before which a UST system may have been permanently closed or
abandoned that ECY may require a site assessment? - (answers)December 22, 1988
WA UST Site Assessor Exam Questions With Complete
Solutions | 100% Pass
What is the hold time for soil and preserved GW GRO samples? - (answers)14 days
Is an ICC certification needed to install an AST? - (answers)No
Flammability limits of gasoline - (answers)1.4 to 7.6%
How many days do you have from a tank closure to report/provide the UST checklist to ECY? -
(answers)30 days
MTCA Method A lead CUL, soil - (answers)250 mg/kg
MTCA Method A lead CUL, GW - (answers)15 ug/L
Is the vadose zone saturated or unsaturated? - (answers)Unsaturated
List in order of most mobile to least mobile: Bunker C, heating oil, diesel, gasoline -
(answers)Gasoline, diesel, heating oil, Bunker C
Is oxygenated gasoline more or less likely to dissolve in water? - (answers)More likely; fuel
additives like MTBE are more soluble than gasoline
Where to sample on dispenser? - (answers)2 feet below where the piping enters the UST
Where to sample along piping? - (answers)Every 50 linear feet and along joints/elbows
, 2
How many GW samples are needed after decommissioning if a release to GW is confirmed, and
where relative to the tank? - (answers)3; 1 upgradient, 2 downgradient
What vapor is an FID used to measure? - (answers)Methane
What is a PID measuring? - (answers)Mixture of all volatiles
What conditions might impede a PID? - (answers)Moisture/humidity, dust, transformers, power
lines
What UST capacity does not require a site assessment at closure? - (answers)Less than 110
gallons
Purpose of a site check - (answers)To investigate a UST site for the presence of a release when
evidence indicated that a release may have occurred
Purpose of a site assessment - (answers)To investigate a UST site at the time of closure or
change-in-service to determine if a release has occurred
Site check vs. site assessment - (answers)A site check is an investigation of a UST site for a
release when evidence indicates that one many have occurred; a site assessment determines if a
release has occurred
If a confirmed release is identified and reported within 24 hours, what is and is not required? -
(answers)A site assessment is not required; a site characterization is required
What is the historical date before which a UST system may have been permanently closed or
abandoned that ECY may require a site assessment? - (answers)December 22, 1988
