|(a) Components of an alternative collection system
must be tested for water tightness by one of the methods shown in
the following table:
(b) Hydrostatic Head Test for Pipe. The total infiltration
or exfiltration, as determined by the hydrostatic head test, must
not exceed 10 gallons per inch diameter per mile of pipe per 24 hours
at a minimum head of 2.0 feet. If the quantity of infiltration or
exfiltration exceeds the maximum quantity specified, the owner shall
take remedial action to reduce the infiltration or exfiltration to
an amount below the specified maximum limits.
(c) Hydrostatic Head Test for Tanks. The test consists
of filling the tank to the top and holding the water for 24 hours
to determine whether the tank is leaking.
(1) The hydrostatic head test must demonstrate that
the tank is not leaking before the placement of backfill around a
(2) The hydrostatic head test for a tank constructed
from flexible or semi-rigid material is required after placement and
backfilling according to the tank manufacturer's recommendations.
(d) Low-Pressure Air Test. The low-pressure air test
must conform to the requirements of §217.57 of this title (relating
to Testing Requirements for Installation of Gravity Collection System
(e) Pressure Pipe Test.
(1) The test pressure must be a minimum of 25 pounds
per square inch or 1.5 times the maximum pipe design pressure, whichever
is larger. The maximum allowable leakage must be calculated using
the following equation:
(2) If the leakage exceeds the maximum amount calculated,
the owner shall take remedial action to reduce the leakage to an amount
within the allowable limit from paragraph (1) of this subsection.
(f) Vacuum Test for a Tank.
(1) The test may begin only after establishing an initial
stable vacuum of 4.0 inches of mercury.
(2) The total vacuum loss during a vacuum test must
not exceed 1.0 inch loss of mercury vacuum after five minutes.
(3) A tank constructed of flexible or semi-rigid material
must not allow more than a 3% change in tank dimensions in any direction
while under vacuum.
(4) If the quantity of vacuum loss or if tank deformation
equals or exceeds the maximum quantity specified in paragraph (2)
of this subsection, then the owner shall take remedial action to reduce
the amount of vacuum loss or amount of deformation to comply with