| Certification |
Leak rate of 0.05 gph with PD = 99.2310% and PFA =
0.5451%. |
| Leak Threshold |
0.02587 gph.
A tank system should not be declared tight
if the test result indicates a loss or gain that equals or exceeds this
threshold. |
| Applicability |
Gasoline, diesel, aviation fuel, fuel oil #4. |
| Tank Capacity |
Maximum of 6,000 gallons. Tank must be minimum 100% full. |
| Waiting Time |
Minimum of 36 hours between delivery and testing.
Minimum
of 1.5 hours between "topping off" and testing.
Total minimum
waiting time is 36 hours.
There must be no dispensing or delivery during
waiting time. |
| Test Period |
Minimum of 1 hour, 48 minutes.
Volume data is collected
and recorded by a computer.
Leak rate is calculated from 1 minute of test.
There must be a minimum of 10 tests performed to conclusively declare a
tank tight or declare a leak.
There must be no dispensing or delivery
during test. |
| Temperature |
Average for product is determined by a resistance
temperature sensor. |
| Groundwater |
Depth to groundwater in tank excavation backfill must be
determined.
If groundwater is above bottom of tank, product level must be
adjusted to provide a height difference of 6 feet between product and
water level. |
| Calibration |
Level sensors must be calibrated before each test.
Temperature sensor must be checked and, if necessary, calibrated in
accordance with manufacturer's instructions. |
| Comments |
Not evaluated using manifolded tank system. |
