Current through Register Vol. 63, No. 3, March 1, 2024
(1) An owner or operator of a source that
chooses to perform toxic air contaminant monitoring under OAR 340-245-0050 must
submit an application for a Toxic Air Contaminant Permit Addendum and a Toxic
Air Contaminant Monitoring Plan, developed in consultation with and approved by
DEQ in a Toxic Air Contaminant Permit Addendum, before beginning toxic air
contaminant monitoring. Toxic air contaminant monitoring must be conducted for
a period of not less than 12 months with at least 12 months of valid data with
greater than 75 percent data completeness per quarter.
(2) Public involvement requirements. DEQ
shall work with the owner or operator to develop public information concerning
an approved Toxic Air Contaminant Monitoring Plan and the timeline for the
approved Toxic Air Contaminant Monitoring Plan.
(3) Toxic air contaminant monitoring
requirements. The owner or operator must submit a Toxic Air Contaminant
Monitoring Plan in accordance with OAR 340-245-0030 that includes but is not
limited to:
(a) Identification of all toxic
air contaminants that will be monitored;
(b) A description of all proposed monitoring
locations;
(c) A description of the
monitoring and analysis protocols for each toxic air contaminant to be
monitored, including at a minimum:
(A) The
monitoring equipment and methods to be used for each toxic air
contaminant;
(B) The sampling
methods, including sample handling and custody storage requirements;
(C) The frequency of sampling at each
monitoring location; the duration of each sample (i.e., the length of time in
hours that each sample runs), and time of year;
(D) Analytical methods and the analytical
method detection limits and reporting limits to be used for each toxic air
contaminant;
(E) Quality assurance
and quality control measures to be taken and who will be performing these
measures; and
(F) Descriptions of
security measures to protect the monitoring equipment;
(d) A description of how to determine and
account for the ambient concentration of each toxic air contaminant being
monitored that results from all causes other than the source under
consideration, including natural and unknown causes;
(e) A description of how and where
meteorological monitoring will be performed and the meteorology equipment used;
and
(f) A description of how the
data will be reduced and how often the results will be reported to
DEQ.
(4) Reporting
Requirements. The owner or operator of a source that has been issued a Toxic
Air Contaminant Permit Addendum or operating permit that includes air
monitoring requirements must report to DEQ the following information:
(a) Monthly monitoring result reports, no
more than 30 days after all monitoring data becomes available for the month to
which the data applies. The reports must include but is not limited to:
(A) Ambient toxic air contaminant
concentrations, all daily risks and all monthly average risks from all
monitoring locations specified in the Air Monitoring Plan;
(B) Meteorological data summary;
(C) Daily production data; and
(D) A description of any excess emissions or
upset conditions that may have affected the ambient toxic air contaminant
concentrations monitored, including conditions outside the property boundary
that may affect ambient air (i.e., forest fires, house fires, train
derailments, accidental spills, etc.);
(b) An air monitoring final report, no more
than 60 calendar days after completing all Toxic Air Contaminant Monitoring
Plan requirements that also includes a description of any process changes that
have occurred during the air monitoring period that may affect the results of
the monitoring.
(5) Air
monitoring results.
(a) Upon completion of the
air monitoring, the owner or operator must submit to DEQ an assessment of risk
based on the air monitoring data and other relevant information;
(b) For all toxic air contaminants that are
not monitored, or for which monitoring results were inconclusive, the owner or
operator must use the modeled concentrations of those toxic air contaminants
and add the risk from the modeled concentrations to the risk from the monitored
concentrations to arrive at a total risk from the source; and
(c) Upon receipt of air monitoring data and
assessment of risk under subsections (a) and (b), DEQ will review the submittal
and approve or deny it in accordance with the procedures OAR
340-245-0100(4).
Statutory/Other Authority: ORS
468.020,
468.065,
468A.025,
468A.040,
468A.050,
468A.070,
468A.155,
468A.135
& 468A.337
Statutes/Other Implemented: 468.065, 468A.025, 468A.040,
468A.050, 468A.070, 468A.155, 468A.010, 468A.015, 468A.035, 468A.337 &
468A.335
