N.J. Admin. Code § 7:14A-9.7 - Leak detection monitoring program
(a) Leak detection
monitoring is required at sanitary landfills at all ground water monitoring
wells installed as part of a ground water monitoring system established
pursuant to
7:14A-9.3(a)1 and
2. At a minimum, a detection monitoring program shall include the monitoring
for the constituents listed in Appendix A to this subchapter, incorporated
herein by reference.
1. The Department shall
remove any of the Appendix A monitoring parameters for a sanitary landfill if
it can be shown that the removed constituents are not reasonably expected to be
in or derived from the waste contained in the sanitary landfill unit.
2. The Department will establish an
alternative list of inorganic indicator parameters for a sanitary landfill, in
lieu of some or all of the heavy metals (constituents 1 through 15 in Appendix
A to this subchapter), if the alternative parameters provide a reliable
indication of inorganic releases from the sanitary landfill to the ground
water. In determining alternative parameters, the Department shall consider the
following factors:
i. The types, quantities,
and concentrations of constituents in wastes managed at the sanitary
landfill;
ii. The mobility,
stability, and persistence of waste constituents or their reaction products in
the unsaturated zone beneath the sanitary landfill;
iii. The detectability of indicator
parameters, waste constituents and reaction products in the ground water;
and
iv. The concentration or values
and coefficients of variation of monitoring parameters or constituents in the
ground water background.
(b) The monitoring frequency for all
constituents listed in Appendix A to this subchapter, or in the alternative
list approved in accordance with (a)2 above, shall be at least semiannual
during the active life of the facility (including closure) and the post closure
period. A minimum of four independent samples from each well (background and
downgradient) shall be collected and analyzed for the Appendix A constituents,
or the alternative list approved in accordance with (a)2 above during the first
semiannual sampling event. At least one sample from each well (background and
downgradient) shall be collected and analyzed during subsequent semiannual
sampling events. The Department will specify an appropriate alternative
frequency for repeated sampling and analysis for Appendix A constituents, or
the alternative list approved in accordance with (a)2 above during the active
life (including closure) and the post closure care period. The alternative
frequency during the active life (including closure) shall be no less than
annual. The alternative frequency shall be based on consideration of the
following factors:
1. The lithology of the
aquifer and unsaturated zone;
2.
The hydraulic conductivity of the aquifer and unsaturated zone;
3. The ground water flow rates;
4. The minimum distance between upgradient
edge of the sanitary landfill and downgradient monitoring well screen (minimum
distance of travel), and
5. The
resource value of the aquifer.
(c) If the owner or operator of a sanitary
landfill determines, pursuant to
7:14A-9.5(g), that
there is a statistically significant increase over background for one or more
of the constituents listed in Appendix A-Part A to this subchapter or in the
alternative list approved in accordance with (a)2 above, at any monitoring well
at the boundary specified under
7:14A-9.3(a)2, the
owner or operator shall:
1. Within 14 days of
this finding, place a notice in the records maintained by the facility
indicating which constituents have shown statistically significant changes from
background levels, and notify the Department that this notice was placed in the
operating record; and
2. Establish
an assessment monitoring program meeting the requirements of
7:14A-9.8 within 90 days except as
provided at (d) below.
(d) The owner or operator may demonstrate
that a source other than a sanitary landfill caused the contamination or that
the statistically significant increase resulted from error in sampling,
analysis, statistical evaluation, or natural variation in ground water quality.
A report documenting this demonstration shall be certified by a qualified
ground water scientist or approved by the Department and be placed in the
records maintained by the facility. If a successful demonstration is made and
documented the owner or operator may continue detection monitoring as specified
in this section. If, after 90 days, a successful demonstration is not made, the
owner or operator shall initiate an assessment monitoring program as required
in 7:14A-9.8.
Notes
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