(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.
(b) Integrated Surface Monitoring. Any
reading exceeding the limit specified in OAR 340-239-0200(1)(b) must be
recorded as an exceedance and all of the following actions must be taken:
(A) The owner or operator must record the
average surface concentration measured as methane for each grid along with
retest dates and results. The location of the grids and the gas collection
system must be clearly marked and identified on a topographic map of the
landfill drawn to scale. 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) Within 10 days of
a measured exceedance, corrective action must be taken by the owner or operator
such as, but not limited to; cover maintenance or repair, or well vacuum
adjustments and the grid must be remonitored. The owner or operator must comply
with all of the following requirements:
(i) If
the remonitoring of the grid shows a second exceedance, additional corrective
action must be taken and the location must be re-monitored again no later than
10 days after the second exceedance.
(ii) If the remonitoring in subparagraph
(1)(b)(B)(i) of this rule shows a third 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.
(C) 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)(b) after four consecutive quarterly integrated surface
monitoring periods, may shift to annual integrated surface
monitoring.
(D) An owner or
operator that has shifted to annual integrated surface monitoring under
paragraph (1)(b)(C) of this rule must return to quarterly integrated surface
monitoring upon the occurrence of any exceedances of the limits specified in
OAR 340-239-0200(1)(b) during annual monitoring or detected during any DEQ
inspection.