ICC California UST Inspector Exam
Questions and Answers 100% Correct
2025/2026 Version.
Which agency approves a site-specific variance which allows for an alternative method of
construction or monitoring:
a.) The Regional Water Quality Board
b.) The State Water Resources Control Board
c.) The Department of Toxic Substance Control
d.) The local agency - Correct Answer - a.) The Regional Water Quality Board
CCR Title 23, Sec 2681(a)
The regulations to enforce compliance of underground storage tank systems in the state are found
in?
a.) Code of Federal Regulations, 40 CFR Part 281
b.) California Code of Regulations, Title 23, Chapter 16
c.) Code of Federal Regulations, 40 CFR Part 280
d.) California Code of Regulations, Title 23, Chapter 17 - Correct Answer - b.) California Code
of Regulations; Title 23, Chapter 16
By definition an "underground storage tank system" includes
a.) The tank, all connected piping and dispensers
b.) The tank, all connected piping, ancillary equipment and containment system
c.) Only the tank
d.) Only tanks totally beneath the surface of the ground - Correct Answer - b.) The tank, all
connected piping, ancillary equipment and containment system
(H&SC, Sec 25281(z))
,The written report submitted to the local agency after an unauthorized release is required to
include the following except:
a.) Description of actions taken to stop the release
b.) Cause of the release
c.) Method of disposal of released product
d.) Date on which the release was discovered - Correct Answer - b.) Cause of the release
CCR Title 23, Sec 2652(c)
An unauthorized release which does not escape from secondary containment only requires a
record on the operator's monitoring reports provided:
A. It did not increase the hazard of fire
B. It did not cause any deterioration of the secondary containment
C. It was cleaned up within 8 hours of detection
D. All of the above - Correct Answer - D. All of the above
H&SC, Sec 25294
The annual monitoring certification may be performed by:
A. A person possessing the appropriate contractors licenses
B. An individual trained and certified by the manufacturer of the monitoring equipment
C. A designated UST operator
D. A person who meets the requirements of both a and b - Correct Answer - D. A person who
meets the requirements of both a and b
CCR Title 23, Sec 2715(i)
When an automatic tank gauge is utilized for single-walled tank leak detection, it shall generate a
post-test hard copy data report of the following information, except:
a.) Liquid volume
b.) Fuel depth
c.) Outside air temperature
d.) Time and date of test - Correct Answer - c.) Outside air temperature
CCR Title 23, Sec 2643(b)(1)
If a UST system is utilizing an overfill alarm, the alarm must be triggered to alert the transfer
operator when the tank is no more than ___________ full
,a.) 85%
b.) 95%
c.) 90%
d.) 80% - Correct Answer - c.) 90%
An automatic stank sgauge sis sutilized sfor sleak sdetection sof sthe s______________.
a.) sTank
b.) sTank sand sPiping
c.) sPiping
d.) sInterstitial sspace s- sCorrect s sAnswer s- sa.) sTank
CCR sTitle s23, sSec s2643(b)(1)
After scompletion sof senhanced sleak sdetection s(ELD) stest, sthe sELD stest sresults smust sbe
ssubmitted sto sthe s_________________.
a.) sThe slocal sagency
b.) sThe sSWRCB
c.) sOwner sof sthe sUST ssystem
d.) sTo sboth sthe sSWRCB sand sthe slocal sagency s- sCorrect s sAnswer s- sd.) sTo sboth sthe
sSWRCB sand sthe slocal sagency
CCR sTitle s23, sSec s2644.1(a)(5)
A spermit sto soperate sa sUST ssystem smust shave sall sof sthe sfollowing slisted son sthe spermit,
sEXCEPT:
a.) sThe sstate sUST sidentification snumber(s)
b.) sName sof sthe stank smanufacturer sand stank scapacity
c.) sPermit sexpiration sdate
d.) sMonitoring srequirements s- sCorrect s sAnswer s- sb.) sName sof sthe stank smanufacturer sand
stank scapacity
CCR sTitle s23, sSec s2712(c)
A stemporary sclosure sis sappropriate sfor swhich sof sthe sfollowing:
a.) sThe sUST ssystem sis sempty sand swill sbe sremoved sfrom sservice sindefinitely
b.) sThe sUST ssystem shas sceased sto sstore shazardous smaterials sbut swill sbe sused swithin sthe
snext s12 sconsecutive smonths
, c.) sThe sUST ssystem sis sunable sto smeet scompliance srequirements sand swill sbe sremoved
d.) sThe sUST ssystem shas sbeen sred-tagged s- sCorrect s sAnswer s- sb.) sThe sUST ssystem shas
sceased sto sstore shazardous smaterials sbut swill sbe sused swithin sthe snext s12 sconsecutive
smonths
CCR sTitle s23, sSec s2671 s& s2670
A slocal sagency sdetermines sthat sa sUST sfacility swithin sthe slast syear shad scompliance sissues.
sPrior sto sissuing sa snew spermit sor srenewal sto soperate san sUST sthe slocal sagency sshall:
a.) sAsk sthe sstate sto sassist sin sa sjoint sinspection
b.) sRequest sthe sowner/operator sto ssubmit sa s"Return sto sCompliance" sform.
c.) sRefer sto sa sDistrict sAttorney sInvestigator
d.) sInspect sthe sfacility sand sdetermine scompliance s- sCorrect s sAnswer s- sd.) sInspect sthe
sfacility sand sdetermine scompliance
CCR sTitle s23, sSec s2712(c)
All sthe sfollowing scomponents srequire sthird sparty scertification, sexcept:
a.) sAutomatic stank sgauging ssystems
b.) sStatistical sinventory sreconciliation smethods
c.) sSpill sContainment slids
d.) sLiquid sphase sout-of-tank sproducts s- sCorrect s sAnswer s- sc.) sSpill sContainment slids
The sexterior ssurface sof san sunderground sstorage stank smust sbear sa smarking sor slabel swhich
sshows sthe sfollowing sinformation, sexcept:
a.) sDesign spressure sin spsig
b.) sUseable scapacity sin sgallons.
c.) sWidth sof sthe sinterstitial sspace
d.) sIdentity sof smanufacturer s- sCorrect s sAnswer s- sc.) sWidth sof sthe sinterstitial sspace
CCR sTitle s23, sSec s2631(b)
Which sof sthe sfollowing sis snot sa sconfined sspace:
a.) sA sreally sdeep sturbine ssump
b.) sA sspace snot sdesigned sfor scontinuous semployee soccupancy
c.) sAn sarea swith slimited saccess
Questions and Answers 100% Correct
2025/2026 Version.
Which agency approves a site-specific variance which allows for an alternative method of
construction or monitoring:
a.) The Regional Water Quality Board
b.) The State Water Resources Control Board
c.) The Department of Toxic Substance Control
d.) The local agency - Correct Answer - a.) The Regional Water Quality Board
CCR Title 23, Sec 2681(a)
The regulations to enforce compliance of underground storage tank systems in the state are found
in?
a.) Code of Federal Regulations, 40 CFR Part 281
b.) California Code of Regulations, Title 23, Chapter 16
c.) Code of Federal Regulations, 40 CFR Part 280
d.) California Code of Regulations, Title 23, Chapter 17 - Correct Answer - b.) California Code
of Regulations; Title 23, Chapter 16
By definition an "underground storage tank system" includes
a.) The tank, all connected piping and dispensers
b.) The tank, all connected piping, ancillary equipment and containment system
c.) Only the tank
d.) Only tanks totally beneath the surface of the ground - Correct Answer - b.) The tank, all
connected piping, ancillary equipment and containment system
(H&SC, Sec 25281(z))
,The written report submitted to the local agency after an unauthorized release is required to
include the following except:
a.) Description of actions taken to stop the release
b.) Cause of the release
c.) Method of disposal of released product
d.) Date on which the release was discovered - Correct Answer - b.) Cause of the release
CCR Title 23, Sec 2652(c)
An unauthorized release which does not escape from secondary containment only requires a
record on the operator's monitoring reports provided:
A. It did not increase the hazard of fire
B. It did not cause any deterioration of the secondary containment
C. It was cleaned up within 8 hours of detection
D. All of the above - Correct Answer - D. All of the above
H&SC, Sec 25294
The annual monitoring certification may be performed by:
A. A person possessing the appropriate contractors licenses
B. An individual trained and certified by the manufacturer of the monitoring equipment
C. A designated UST operator
D. A person who meets the requirements of both a and b - Correct Answer - D. A person who
meets the requirements of both a and b
CCR Title 23, Sec 2715(i)
When an automatic tank gauge is utilized for single-walled tank leak detection, it shall generate a
post-test hard copy data report of the following information, except:
a.) Liquid volume
b.) Fuel depth
c.) Outside air temperature
d.) Time and date of test - Correct Answer - c.) Outside air temperature
CCR Title 23, Sec 2643(b)(1)
If a UST system is utilizing an overfill alarm, the alarm must be triggered to alert the transfer
operator when the tank is no more than ___________ full
,a.) 85%
b.) 95%
c.) 90%
d.) 80% - Correct Answer - c.) 90%
An automatic stank sgauge sis sutilized sfor sleak sdetection sof sthe s______________.
a.) sTank
b.) sTank sand sPiping
c.) sPiping
d.) sInterstitial sspace s- sCorrect s sAnswer s- sa.) sTank
CCR sTitle s23, sSec s2643(b)(1)
After scompletion sof senhanced sleak sdetection s(ELD) stest, sthe sELD stest sresults smust sbe
ssubmitted sto sthe s_________________.
a.) sThe slocal sagency
b.) sThe sSWRCB
c.) sOwner sof sthe sUST ssystem
d.) sTo sboth sthe sSWRCB sand sthe slocal sagency s- sCorrect s sAnswer s- sd.) sTo sboth sthe
sSWRCB sand sthe slocal sagency
CCR sTitle s23, sSec s2644.1(a)(5)
A spermit sto soperate sa sUST ssystem smust shave sall sof sthe sfollowing slisted son sthe spermit,
sEXCEPT:
a.) sThe sstate sUST sidentification snumber(s)
b.) sName sof sthe stank smanufacturer sand stank scapacity
c.) sPermit sexpiration sdate
d.) sMonitoring srequirements s- sCorrect s sAnswer s- sb.) sName sof sthe stank smanufacturer sand
stank scapacity
CCR sTitle s23, sSec s2712(c)
A stemporary sclosure sis sappropriate sfor swhich sof sthe sfollowing:
a.) sThe sUST ssystem sis sempty sand swill sbe sremoved sfrom sservice sindefinitely
b.) sThe sUST ssystem shas sceased sto sstore shazardous smaterials sbut swill sbe sused swithin sthe
snext s12 sconsecutive smonths
, c.) sThe sUST ssystem sis sunable sto smeet scompliance srequirements sand swill sbe sremoved
d.) sThe sUST ssystem shas sbeen sred-tagged s- sCorrect s sAnswer s- sb.) sThe sUST ssystem shas
sceased sto sstore shazardous smaterials sbut swill sbe sused swithin sthe snext s12 sconsecutive
smonths
CCR sTitle s23, sSec s2671 s& s2670
A slocal sagency sdetermines sthat sa sUST sfacility swithin sthe slast syear shad scompliance sissues.
sPrior sto sissuing sa snew spermit sor srenewal sto soperate san sUST sthe slocal sagency sshall:
a.) sAsk sthe sstate sto sassist sin sa sjoint sinspection
b.) sRequest sthe sowner/operator sto ssubmit sa s"Return sto sCompliance" sform.
c.) sRefer sto sa sDistrict sAttorney sInvestigator
d.) sInspect sthe sfacility sand sdetermine scompliance s- sCorrect s sAnswer s- sd.) sInspect sthe
sfacility sand sdetermine scompliance
CCR sTitle s23, sSec s2712(c)
All sthe sfollowing scomponents srequire sthird sparty scertification, sexcept:
a.) sAutomatic stank sgauging ssystems
b.) sStatistical sinventory sreconciliation smethods
c.) sSpill sContainment slids
d.) sLiquid sphase sout-of-tank sproducts s- sCorrect s sAnswer s- sc.) sSpill sContainment slids
The sexterior ssurface sof san sunderground sstorage stank smust sbear sa smarking sor slabel swhich
sshows sthe sfollowing sinformation, sexcept:
a.) sDesign spressure sin spsig
b.) sUseable scapacity sin sgallons.
c.) sWidth sof sthe sinterstitial sspace
d.) sIdentity sof smanufacturer s- sCorrect s sAnswer s- sc.) sWidth sof sthe sinterstitial sspace
CCR sTitle s23, sSec s2631(b)
Which sof sthe sfollowing sis snot sa sconfined sspace:
a.) sA sreally sdeep sturbine ssump
b.) sA sspace snot sdesigned sfor scontinuous semployee soccupancy
c.) sAn sarea swith slimited saccess
