General Glossary

This is a method of external leak detection that involves the use
of one or more monitoring wells placed close to the piping that
can be monitored visually or by electronic sensors. The wells
are checked monthly for the presence of product that has leaked
from the piping and is floating on to the groundwater. The wells
are checked monthly for the presence of product that has leaked
from the piping and is floating on to the groundwater. Also,
there are a number of criteria that must be met to use this as a

A leak detection method used to check the area between the pipe
and the secondary containment for leaks and alert the operator if
a leak is suspected.

This is a device that is connected to a probe inside an
underground storage tank. A float on the probe detects product
level inside the tank and triggers a bell or whistle that alerts
a delivery person that the tank is 90 percent full.

This signifies that the 30-day notification form submitted by the
tank owner indicated that a tank has a form of overfill
protection, but the specific type is unknown. On older MPCA
notification forms, the type of overfill protection did not have
to be indicated.

This indicates an alternative form of leak detection that is not
specifically defined in the UST or AST rules.

This is a precision or integrity test used to determine if a pipe
is leaking at a volume of at least 0.1 gallons per hour.

This indicates an alternative form of leak detection that is not
specifically defined in the in the UST or AST rules.

This is the date that the annual leak SIR report is due to MPCA.
The date is February 15th.

This is any other form of leak detection used for piping that is
not specifically mentioned in the UST or AST rules.

This is a precision or integrity test used to determine if a tank
is leaking.