| Certification |
Leak rate of 0.1
gph with PD = 99.86% and PFA = 0.14%. |
| Leak
Threshold |
0.05 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 15,000
gallons.
Tank must be minimum 100% full. |
| Waiting
Time |
Minimum of 6
hours between delivery and testing.
Minimum of 1 hour between "topping off" and testing.
There must be no dispensing or delivery during waiting time. |
| Test
Period |
Minimum of 1
hour.
Test data are acquired and recorded manually and by system's
computer.
Leak rate is calculated from average of the last 10 consecutive 6 minute
readings.
There must be no dispensing or delivery during test. |
| Temperature |
Average for
product is determined by a minimum of 10 temperature sensors. |
| 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 net pressure of 2-4 psi at bottom of tank during test. |
| Calibration |
Temperature
sensors must be checked annually and calibrated annually in accordance
with manufacturer's instructions. |
| Comments |
Not evaluated
using manifolded tank systems. |
