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 dtank dgauge dis dutilized dfor dleak ddetection dof dthe d______________.
a.) dTank
b.) dTank dand dPiping
c.) dPiping
d.) dInterstitial dspace d- dCorrect d dAnswer d- da.) dTank
CCR dTitle d23, dSec d2643(b)(1)
After dcompletion dof denhanced dleak ddetection d(ELD) dtest, dthe dELD dtest dresults dmust dbe
dsubmitted dto dthe d_________________.
a.) dThe dlocal dagency
b.) dThe dSWRCB
c.) dOwner dof dthe dUST dsystem
d.) dTo dboth dthe dSWRCB dand dthe dlocal dagency d- dCorrect d dAnswer d- dd.) dTo dboth dthe
dSWRCB dand dthe dlocal dagency
CCR dTitle d23, dSec d2644.1(a)(5)
A dpermit dto doperate da dUST dsystem dmust dhave dall dof dthe dfollowing dlisted don dthe dpermit,
dEXCEPT:
a.) dThe dstate dUST didentification dnumber(s)
b.) dName dof dthe dtank dmanufacturer dand dtank dcapacity
c.) dPermit dexpiration ddate
d.) dMonitoring drequirements d- dCorrect d dAnswer d- db.) dName dof dthe dtank dmanufacturer dand
dtank dcapacity
CCR dTitle d23, dSec d2712(c)
A dtemporary dclosure dis dappropriate dfor dwhich dof dthe dfollowing:
a.) dThe dUST dsystem dis dempty dand dwill dbe dremoved dfrom dservice dindefinitely
b.) dThe dUST dsystem dhas dceased dto dstore dhazardous dmaterials dbut dwill dbe dused dwithin dthe
dnext d12 dconsecutive dmonths
, c.) dThe dUST dsystem dis dunable dto dmeet dcompliance drequirements dand dwill dbe dremoved
d.) dThe dUST dsystem dhas dbeen dred-tagged d- dCorrect d dAnswer d- db.) dThe dUST dsystem dhas
dceased dto dstore dhazardous dmaterials dbut dwill dbe dused dwithin dthe dnext d12 dconsecutive
dmonths
CCR dTitle d23, dSec d2671 d& d2670
A dlocal dagency ddetermines dthat da dUST dfacility dwithin dthe dlast dyear dhad dcompliance
dissues. dPrior dto dissuing da dnew dpermit dor drenewal dto doperate dan dUST dthe dlocal dagency
dshall:
a.) dAsk dthe dstate dto dassist din da djoint dinspection
b.) dRequest dthe downer/operator dto dsubmit da d"Return dto dCompliance" dform.
c.) dRefer dto da dDistrict dAttorney dInvestigator
d.) dInspect dthe dfacility dand ddetermine dcompliance d- dCorrect d dAnswer d- dd.) dInspect dthe
dfacility dand ddetermine dcompliance
CCR dTitle d23, dSec d2712(c)
All dthe dfollowing dcomponents drequire dthird dparty dcertification, dexcept:
a.) dAutomatic dtank dgauging dsystems
b.) dStatistical dinventory dreconciliation dmethods
c.) dSpill dContainment dlids
d.) dLiquid dphase dout-of-tank dproducts d- dCorrect d dAnswer d- dc.) dSpill dContainment dlids
The dexterior dsurface dof dan dunderground dstorage dtank dmust dbear da dmarking dor dlabel dwhich
dshows dthe dfollowing dinformation, dexcept:
a.) dDesign dpressure din dpsig
b.) dUseable dcapacity din dgallons.
c.) dWidth dof dthe dinterstitial dspace
d.) dIdentity dof dmanufacturer d- dCorrect d dAnswer d- dc.) dWidth dof dthe dinterstitial dspace
CCR dTitle d23, dSec d2631(b)
Which dof dthe dfollowing dis dnot da dconfined dspace:
a.) dA dreally ddeep dturbine dsump
b.) dA dspace dnot ddesigned dfor dcontinuous demployee doccupancy
c.) dAn darea dwith dlimited daccess
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 dtank dgauge dis dutilized dfor dleak ddetection dof dthe d______________.
a.) dTank
b.) dTank dand dPiping
c.) dPiping
d.) dInterstitial dspace d- dCorrect d dAnswer d- da.) dTank
CCR dTitle d23, dSec d2643(b)(1)
After dcompletion dof denhanced dleak ddetection d(ELD) dtest, dthe dELD dtest dresults dmust dbe
dsubmitted dto dthe d_________________.
a.) dThe dlocal dagency
b.) dThe dSWRCB
c.) dOwner dof dthe dUST dsystem
d.) dTo dboth dthe dSWRCB dand dthe dlocal dagency d- dCorrect d dAnswer d- dd.) dTo dboth dthe
dSWRCB dand dthe dlocal dagency
CCR dTitle d23, dSec d2644.1(a)(5)
A dpermit dto doperate da dUST dsystem dmust dhave dall dof dthe dfollowing dlisted don dthe dpermit,
dEXCEPT:
a.) dThe dstate dUST didentification dnumber(s)
b.) dName dof dthe dtank dmanufacturer dand dtank dcapacity
c.) dPermit dexpiration ddate
d.) dMonitoring drequirements d- dCorrect d dAnswer d- db.) dName dof dthe dtank dmanufacturer dand
dtank dcapacity
CCR dTitle d23, dSec d2712(c)
A dtemporary dclosure dis dappropriate dfor dwhich dof dthe dfollowing:
a.) dThe dUST dsystem dis dempty dand dwill dbe dremoved dfrom dservice dindefinitely
b.) dThe dUST dsystem dhas dceased dto dstore dhazardous dmaterials dbut dwill dbe dused dwithin dthe
dnext d12 dconsecutive dmonths
, c.) dThe dUST dsystem dis dunable dto dmeet dcompliance drequirements dand dwill dbe dremoved
d.) dThe dUST dsystem dhas dbeen dred-tagged d- dCorrect d dAnswer d- db.) dThe dUST dsystem dhas
dceased dto dstore dhazardous dmaterials dbut dwill dbe dused dwithin dthe dnext d12 dconsecutive
dmonths
CCR dTitle d23, dSec d2671 d& d2670
A dlocal dagency ddetermines dthat da dUST dfacility dwithin dthe dlast dyear dhad dcompliance
dissues. dPrior dto dissuing da dnew dpermit dor drenewal dto doperate dan dUST dthe dlocal dagency
dshall:
a.) dAsk dthe dstate dto dassist din da djoint dinspection
b.) dRequest dthe downer/operator dto dsubmit da d"Return dto dCompliance" dform.
c.) dRefer dto da dDistrict dAttorney dInvestigator
d.) dInspect dthe dfacility dand ddetermine dcompliance d- dCorrect d dAnswer d- dd.) dInspect dthe
dfacility dand ddetermine dcompliance
CCR dTitle d23, dSec d2712(c)
All dthe dfollowing dcomponents drequire dthird dparty dcertification, dexcept:
a.) dAutomatic dtank dgauging dsystems
b.) dStatistical dinventory dreconciliation dmethods
c.) dSpill dContainment dlids
d.) dLiquid dphase dout-of-tank dproducts d- dCorrect d dAnswer d- dc.) dSpill dContainment dlids
The dexterior dsurface dof dan dunderground dstorage dtank dmust dbear da dmarking dor dlabel dwhich
dshows dthe dfollowing dinformation, dexcept:
a.) dDesign dpressure din dpsig
b.) dUseable dcapacity din dgallons.
c.) dWidth dof dthe dinterstitial dspace
d.) dIdentity dof dmanufacturer d- dCorrect d dAnswer d- dc.) dWidth dof dthe dinterstitial dspace
CCR dTitle d23, dSec d2631(b)
Which dof dthe dfollowing dis dnot da dconfined dspace:
a.) dA dreally ddeep dturbine dsump
b.) dA dspace dnot ddesigned dfor dcontinuous demployee doccupancy
c.) dAn darea dwith dlimited daccess
