Oregon Administrative Rules
Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY
Division 122 - HAZARDOUS SUBSTANCE REMEDIAL ACTION RULES
Section 340-122-0355 - Evaluation of Analytical Results
Current through Register Vol. 63, No. 3, March 1, 2024
(1) The results of the soil analyses shall be interpreted as follows:
(2) A site shall be considered sufficiently clean when all of the sampled areas have concentrations less than or equal to the required matrix cleanup level, and when the possibility of any human contact with the residual soil contamination remaining on the site has been precluded.
(3) If water is present in the tank pit, the Department shall decide if cleanup may proceed under these rules or if further action must be taken pursuant to OAR 340-122-0240. This decision shall be based on, but is not limited to:
(4) If a pocket of contamination exceeding the required Matrix cleanup level is located under a building or other structure where further removal would endanger the structure or be prohibitively expensive, the Department must be notified of this situation. The Department shall then decide whether such contamination can remain without threatening public health, safety, and welfare or the environment. If not, the Department shall require further remediation.
(5) For waste oil contaminated sites, all detectable levels of volatile chlorinated solvents, volatile aromatic hydrocarbons, PCBs, or leachable metals shall be reported to the Department as soon as these results are known. The Department shall then decide whether the cleanup shall continue under these rules or whether further investigation is warranted under OAR 340-122-0205 through 340-122-0260 or 340-122-0010 through 340-122-0115.
Stat. Auth.: ORS 465.400 & ORS 466.746
Stats. Implemented: ORS 465.200 - ORS 465.455 & ORS 466.706 - ORS 466.835