Oregon Administrative Rules › Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY › Division 177 - RESIDENTIAL HEATING OIL UNDERGROUND STORAGE TANKS › Section 340-177-0025 - Decommissioning Standards and Reporting Requirements

Current through Register Vol. 63, No. 7, July 1, 2024
(1) Any responsible person for property where
			 a heating oil tank is located who voluntarily decommissions the tank, or a
			 licensed service provider contracted to perform the work, must conduct the work
			 in accordance with the standards set forth in this section and insure that
			 appropriate safety precautions are maintained at all times.
(2) The decommissioning must be conducted
			 using a national code of practice, such as, "Removal and Disposal of Used
			 Underground Petroleum Storage Tanks,' American Petroleum Institute (API) 1604,
			 (March, 1996) or Uniform Fire Code Article 79. The specific procedures used
			 must be stated in required reports. The following actions must be taken in all
			 cases:
(a) The tank and associated piping must
			 be cleaned as thoroughly as possible to the maximum extent practicable of all
			 product, sludge and/or water rinsate. This material must be recycled or
			 disposed of in accordance with all local, state, and federal
			 requirements;
(b) The cleaned,
			 empty tank must be: removed from the ground and disposed or recycled
			 appropriately, or the tank must be completely filled in-place with a
			 non-reactive (i.e. inert) solid material that is compacted in the tank and that
			 is appropriate for individual site conditions; and
(c) A site assessment must be conducted to
			 determine if a release has occurred using the following procedures:
(A) If the tank is removed during
			 decommissioning: collect two soil samples, one from each end of the excavation.
			 Each sample must be collected at least six inches in native soil below the
			 bottom of the excavation, but no more than one foot below the bottom of the
			 former heating oil tank.
(B) If the
			 tank is decommissioned in-place: collect two soil samples, one from each end of
			 the tank, no more than six inches from the end of the tank. Each sample must be
			 collected at least one foot, but no more than two feet, below the bottom of the
			 tank.
(C) If there are obvious
			 areas of contamination based on visual observations or odors, samples must be
			 collected from these areas of worst contamination, in addition to (A) or (B) of
			 this subsection.
(d)
			 Soil samples must be collected in accordance with OAR 340-122-0340  and
			 340-122-0345  and analyzed for Diesel/Lube Oil Range Hydrocarbons by Method
			 NWTPH-Dx (DEQ, December, 1996) in accordance with 340-122-0218.
(e) If groundwater is encountered during soil
			 boring or in the tank excavation, a water sample must be collected. The sample
			 must be collected in accordance with OAR 340-122-0340  and 340-122-0345  and
			 analyzed for benzene, toluene, ethylbenzene, and total xylenes (BTEX) and
			 polynuclear aromatic hydrocarbons (PAHs) in accordance with 340-122-0340(4)(B)
			 and (C).
(f) If contamination is
			 detected that exceeds confirmed release levels as defined in OAR
			 340-177-0005(3), the decommissioning is now considered to be a cleanup project
			 instead of a decommissioning project. 340-177-0055  outlines reporting and
			 cleanup project requirements.