An owner and
permittee using tightness testing in combination with a primary release
detection method or as a method for investigating a suspected release must use
a test method or procedure that:
(a) Is able
to detect a 0.1 gallon per hour leak rate from any portion of the UST system
that routinely contains a regulated substance, while accounting for the effects
of thermal expansion or contraction of the regulated substance, vapor pockets,
tank deformation, evaporation or condensation and the location of the water
(b) Meets a probability of
detection of at least 95 percent and a probability of false results (or false
alarm, depending on method used) of no more than 5 percent; and
(c) Is an approved leak detection method or
equipment as listed by a national organization (e.g., the National Work Group
on Leak Detection).
All tightness testing must be performed by a service provider or supervisor
licensed by DEQ, except as provided by OAR 340-150-0156
(3) Some automatic tank gauge equipment may
meet the leak rate and probability requirements and may be used in place of a
separate tightness test. To qualify as a tightness test, the automatic tank
gauge must meet the requirements of section (1) of this rule.
If an UST system fails a tightness test
(after the tank tester has ensured that all test protocols were properly
performed), an owner and permittee must report the failure to DEQ within 24
hours of receipt of the results as a suspected release (OAR 340-150-0500
immediately begin an investigation under OAR 340-150-0510
Or. Admin. R.
DEQ 6-2003, f. & cert.
188-2018, amend filed 05/14/2018, effective
Statutory/Other Authority: ORS
- 466.835, 466.994 & 466.995
Statutes/Other Implemented: ORS