Oregon Administrative Rules › Chapter 340 - DEPARTMENT OF ENVIRONMENTAL QUALITY › Division 239 - LANDFILL GAS EMISSIONS › Section 340-239-0600 - Monitoring Requirements

Current through Register Vol. 63, No. 7, July 1, 2024
When required as provided in OAR 340-239-0100  through
				340-239-0800, the owner or operator of a landfill must comply with the
				monitoring requirements in this rule.
(1) Surface Emissions Monitoring
			 Requirements. The owner or operator of a landfill with a gas collection and
			 control system must conduct quarterly instantaneous and integrated surface
			 monitoring of the landfill surface using the procedures specified in OAR
			 340-239-0800(3). All of the following requirements apply to such monitoring:
(a) Instantaneous Surface Monitoring. Any
			 reading exceeding a limit specified in OAR 340-239-0100(6)(b),
			 340-239-0200(1)(a), or 340-239-0400(2)(c)  must be recorded as an exceedance and
			 all of the following actions must be taken:
(A) The owner or operator must record the
			 name of the individual that conducted SEM, date, location, and value of each
			 exceedance, along with retest dates and results. The location of each
			 exceedance must be clearly marked and identified on a topographic map of the
			 landfill, drawn to scale with the location of both the grids and the gas
			 collection system clearly identified. The documentation required under this
			 subsection must be retained in the landfill's files and reported to DEQ as
			 provided in OAR 340-239-0700.
(B)
			 The owner or operator must take corrective action such as, but not limited to,
			 cover maintenance or repair, or well vacuum adjustments.
(C) The owner or operator must remonitor the
			 location of the exceedance, and the location must be remonitored within ten
			 days of a measured exceedance. The owner or operator must comply with all of
			 the following requirements:
(i) If the
			 remonitoring of the location shows a second exceedance, the owner or operator
			 must take additional corrective action and the location must be re-monitored
			 again no later than 10 days after the second exceedance.
(ii) If the remonitoring shows a third
			 exceedance, the owner or owner or operator must install a new or replacement
			 collection device and must demonstrate compliance no later than 120 days after
			 detecting the third exceedance.
(iii) Any location that initially showed an
			 exceedance but has a methane concentration at the 10-day remonitoring of less
			 than 500 ppmv methane, or 200 ppmv methane if this is to determine compliance
			 with OAR 340-239-0100(6)(b), must be re-monitored one month from the initial
			 exceedance. If the one-month re-monitoring shows a concentration less than 500
			 ppmv methane, or 200 ppmv methane if this is to determine compliance with OAR
			 340-239-0100(6)(b), no further monitoring of that location is required until
			 the next quarterly monitoring period. If the one-month re-monitoring shows an
			 exceedance, the owner or operator must install a new or replacement well to
			 achieve compliance no later than 120 days after detecting the third
			 exceedance.
(iv) For any location
			 where monitored methane concentration equals or exceeds 500 ppmv, or 200 ppmv
			 methane if this is to determine compliance with OAR 340-239-0100(6)(b), three
			 times within a quarterly period, a new well or other collection device must be
			 installed within 120 days of the initial exceedance. An alternative remedy to
			 the exceedance, such as upgrading the blower, header pipes or control device,
			 and a corresponding timeline for installation may be submitted to DEQ for
			 approval pursuant to OAR 340-239-0500.
(D) The owner or operator of a closed or
			 inactive landfill, or of any closed or inactive areas on an active landfill
			 that has no monitored exceedances of the limits specified in OAR
			 340-239-0200(1)(a)  after four consecutive quarterly instantaneous surface
			 monitoring periods, may shift to annual instantaneous surface
			 monitoring.
(E) An owner or
			 operator that has shifted to annual instantaneous surface monitoring under
			 paragraph (1)(a)(C) of this rule must return to quarterly instantaneous surface
			 monitoring upon any exceedances of the limits specified in OAR
			 340-239-0200(1)(a)  that cannot be remediated within 10 days or upon any
			 exceedances detected during a DEQ inspection.