California Designated Operator Study
Guide with Complete Solutions
1. Automatic Tank Gauge - ANSWER-a. Test must be conducted at least once a month
with the tank when the product level in the tank is at least 3 feet
b. Must detect a 0.2 gallon/hour leak
c. The tank gauge system must generate a hard copy of all data reported
1. Each tank is monitored individually in accordance with the following procedures -
ANSWER-a. Separate measurements are taking daily of the fuel and water levels in the
tanks
b. Daily reading must be taken of the input (fuel deliveries) and withdrawals (gasoline
dispensed)
c. Product must be allowed to stabilize prior to taking measurements
d. Product must be delivered to the tank through a drop tube that extends within 12
inches of the bottom of the tank
2. Automatic Tank Gauge Plus Manual Inventory Reconciliation - ANSWER-a. Test
must be conducted at least once a month with the tank filled within 10% of the highest
operating level
b. Must detect a 0.1 gallon/hour leak
c. The tank gauge system must generate a hard copy of all data reported
d. Manual inventory reconciliation must be performed in accordance with appropriate
requirements (see section Title 23 section 2646)
2. The daily variation shall be calculated and, at the end of the month totaled to
determine the monthly variation. If the absolute value of the total monthly variation
exceeds 1% of the total input or withdrawal (throughput) plus 130 gallons, the following
steps shall be taken: - ANSWER-a. Within 24 hours, the local agency must be notified
of a potential unauthorized release.
b. Within 24 hours, inventory records for the previous 30 days shall be reviewed to
determine if a calculation error was made
c. Within 24 hours, all readily accessible equipment must be inspected
d. As appropriate, verify the calibration of all dispenser meters within 24 hours of
inspecting all equipment
e. Continue to conduct inventory reconciliation. If a second 30 period confirms initial
results, an unauthorized release must be reported in accordance with regulatory
requirements
f. Conduct additional tests as required by the local agency
3. On an annual basis, submit written confirmation to the local agency of the monthly
reporting results - ANSWER-
, 3. Statistical Inventory Reconciliation Plus Tank Integrity Testing - ANSWER-a.
Statistical inventory reconciliation shall be conducted at least once per month in
accordance with the appropriate requirements (see Title 23 section 2646.1)
b. A tank integrity test shall be conducted once every 2 years in accordance with the
appropriate requirements (see Title 23 section 2643.1)
4
4. Manual Inventory Reconciliation Plus Tank Integrity Testing - ANSWER-a. Manual
inventory reconciliation shall be conducted at least once per month in accordance with
appropriate requirements (see Title 23 section 2646)
b. Manual inventory reconciliation must be able to detect a release of 1.0 gallons/hour
c. A tank integrity test shall be conducted once every year in accordance with the
appropriate requirements (see Title 23 section 2643.1)
5. Other Methods Approved by the State Water Board - ANSWER-upon approval
A monitoring program that relies on the mechanical or electrical detection in the
interstitial space shall include: - ANSWER-1. Continuous monitoring of the interstitial
space
2. An audible and visual alarm system approved by the local agency
3. For methods where that use indirect monitoring to determine if a release has
occurred (e.g., wet annular or continuous vacuum), the monitoring program shall specify
the proposed methods for determining if a release has occurred
A secondary containment system for a new tank which is not an integral part of the of
the primary containment shall be - ANSWER-designed and constructed according to an
engineering specification approved by a state registered professional engineer or
according to a nationally recognized industry code or engineering standard.
A tank integrity test that is used as part of a monitoring program shall meet appropriate
regulatory requirements and shall be conducted using one of the following methods: -
ANSWER-1. A volumetric Test
a. Shall be capable of detecting a release of 0.1 gph from any portion of the tank
b. The tank must be at least 65% full or the tank can be at any product level if the entire
tank is tested under pressure equivalent to a full tank
c. If the test is conducted at a product level lower than the overfill protection device set
point, a nonvolumetric test must be performed on the ullage portion of the tank
2. Nonvolumetric Test
a. Must be capable of detecting a 0.1 gph leak from any portion of the tank at any
product level
A visual interstitial monitoring plan for new tanks shall include: - ANSWER-1. Inspection
of all tank surfaces and the floor beneath the tank by direct viewing
2. Daily inspections except on weekends or recognized state and federal holiday. (This
requirement can be reduced at the discretion of the local agency depending but shall
not be less than weekly).
Guide with Complete Solutions
1. Automatic Tank Gauge - ANSWER-a. Test must be conducted at least once a month
with the tank when the product level in the tank is at least 3 feet
b. Must detect a 0.2 gallon/hour leak
c. The tank gauge system must generate a hard copy of all data reported
1. Each tank is monitored individually in accordance with the following procedures -
ANSWER-a. Separate measurements are taking daily of the fuel and water levels in the
tanks
b. Daily reading must be taken of the input (fuel deliveries) and withdrawals (gasoline
dispensed)
c. Product must be allowed to stabilize prior to taking measurements
d. Product must be delivered to the tank through a drop tube that extends within 12
inches of the bottom of the tank
2. Automatic Tank Gauge Plus Manual Inventory Reconciliation - ANSWER-a. Test
must be conducted at least once a month with the tank filled within 10% of the highest
operating level
b. Must detect a 0.1 gallon/hour leak
c. The tank gauge system must generate a hard copy of all data reported
d. Manual inventory reconciliation must be performed in accordance with appropriate
requirements (see section Title 23 section 2646)
2. The daily variation shall be calculated and, at the end of the month totaled to
determine the monthly variation. If the absolute value of the total monthly variation
exceeds 1% of the total input or withdrawal (throughput) plus 130 gallons, the following
steps shall be taken: - ANSWER-a. Within 24 hours, the local agency must be notified
of a potential unauthorized release.
b. Within 24 hours, inventory records for the previous 30 days shall be reviewed to
determine if a calculation error was made
c. Within 24 hours, all readily accessible equipment must be inspected
d. As appropriate, verify the calibration of all dispenser meters within 24 hours of
inspecting all equipment
e. Continue to conduct inventory reconciliation. If a second 30 period confirms initial
results, an unauthorized release must be reported in accordance with regulatory
requirements
f. Conduct additional tests as required by the local agency
3. On an annual basis, submit written confirmation to the local agency of the monthly
reporting results - ANSWER-
, 3. Statistical Inventory Reconciliation Plus Tank Integrity Testing - ANSWER-a.
Statistical inventory reconciliation shall be conducted at least once per month in
accordance with the appropriate requirements (see Title 23 section 2646.1)
b. A tank integrity test shall be conducted once every 2 years in accordance with the
appropriate requirements (see Title 23 section 2643.1)
4
4. Manual Inventory Reconciliation Plus Tank Integrity Testing - ANSWER-a. Manual
inventory reconciliation shall be conducted at least once per month in accordance with
appropriate requirements (see Title 23 section 2646)
b. Manual inventory reconciliation must be able to detect a release of 1.0 gallons/hour
c. A tank integrity test shall be conducted once every year in accordance with the
appropriate requirements (see Title 23 section 2643.1)
5. Other Methods Approved by the State Water Board - ANSWER-upon approval
A monitoring program that relies on the mechanical or electrical detection in the
interstitial space shall include: - ANSWER-1. Continuous monitoring of the interstitial
space
2. An audible and visual alarm system approved by the local agency
3. For methods where that use indirect monitoring to determine if a release has
occurred (e.g., wet annular or continuous vacuum), the monitoring program shall specify
the proposed methods for determining if a release has occurred
A secondary containment system for a new tank which is not an integral part of the of
the primary containment shall be - ANSWER-designed and constructed according to an
engineering specification approved by a state registered professional engineer or
according to a nationally recognized industry code or engineering standard.
A tank integrity test that is used as part of a monitoring program shall meet appropriate
regulatory requirements and shall be conducted using one of the following methods: -
ANSWER-1. A volumetric Test
a. Shall be capable of detecting a release of 0.1 gph from any portion of the tank
b. The tank must be at least 65% full or the tank can be at any product level if the entire
tank is tested under pressure equivalent to a full tank
c. If the test is conducted at a product level lower than the overfill protection device set
point, a nonvolumetric test must be performed on the ullage portion of the tank
2. Nonvolumetric Test
a. Must be capable of detecting a 0.1 gph leak from any portion of the tank at any
product level
A visual interstitial monitoring plan for new tanks shall include: - ANSWER-1. Inspection
of all tank surfaces and the floor beneath the tank by direct viewing
2. Daily inspections except on weekends or recognized state and federal holiday. (This
requirement can be reduced at the discretion of the local agency depending but shall
not be less than weekly).
