Current through Register Vol. 54, No. 44, November 2, 2024
(a)
The leachate detection zone shall meet the following performance standards. The
leachate detection zone shall:
(1) Rapidly
detect and collect liquid entering the leachate detection zone, and rapidly
transmit the liquid to the leachate treatment system.
(2) Withstand chemical attack from waste or
leachate.
(3) Withstand anticipated
loads, stresses and disturbances from overlying waste, waste cover materials
and equipment operation.
(4)
Function without clogging.
(5)
Prevent the liner from puncturing, cracking, tearing, stretching or otherwise
losing its physical integrity.
(6)
Cover the bottom and sidewalls of the facility.
(b) Unless alternative design requirements to
meet the performance standards in subsection (a) are approved as part of the
permit under §
287.231 (relating to equivalency
review procedure), the leachate detection zone of a liner system shall meet the
following design requirements. The leachate detection zone shall:
(1) Be at least 12 inches thick.
(2) Contain no material exceeding 0.5 inches
in particle size.
(3) Create a flow
zone between the subbase and the liner equal to or more permeable than 1.0 x
10-2 cm/sec. based on laboratory testing, and when
required by the Department, field testing.
(4) Contain a perforated piping system
capable of detecting and intercepting liquid within the leachate detection zone
and conveying the liquid to a collection sump for storage, processing or
disposal. The sump shall be separate from the leachate collection sump and
shall be of a sufficient size to transmit leachate that is generated. The
piping system shall also meet the following requirements:
(i) The slope, size and spacing of the piping
system shall assure that liquids drain from the leachate detection
zone.
(ii) The pipes shall be
installed primarily perpendicular to the flow and shall have a minimum
postsettlement grade of at least 2%.
(iii) The minimum diameter of the perforated
pipe shall be 4 inches with a wall thickness of Schedule-80 or greater as
specified by ASTM or equivalent.
(iv) The pipes shall be cleaned and
maintained as necessary.
(5) Have a minimum bottom slope of
2%.
(6) Contain noncarbonate stones
or aggregates with no sharp edges.
(c) The operator shall monitor the leachate
detection zone weekly to determine whether liquid is flowing from the
zone.
(d) If liquid is flowing from
the leachate detection zone, the operator shall immediately do the following:
(1) Notify the Department in
writing.
(2) Estimate, on a weekly
basis, the volume of liquid flowing from the zone.
(3) Sample and analyze the liquid quarterly,
unless a more frequent basis is required by the Department, for pH, specific
conductivity, total organic carbon, chlorides and other parameters specified in
the permit. The Department may also require sampling and analysis for other
constituents expected to be found in the waste.
(4) Provide written copies of flow and
analysis data to the Department.
(e) If leachate flow is greater than 100
gallons per acre of lined collection area per day, or more than 10% of leachate
generation the operator shall do the following:
(1) Submit to the Department a plan within 30
days for locating the source of leachate in the leachate detection zone, and
for determining the severity and cause of leachate penetration.
(2) Implement the plan upon Department
approval, and complete the plan in a reasonable time not to exceed 6
months.
(3) Submit to the
Department within 45 days after completion of the plan a report containing the
new data collected, analysis of the data and recommendations concerning a
remedial plan.
(4) Conduct
quarterly sampling and analysis for the parameters in §
289.264(a)(1)
(relating to sampling and analysis), and submit copies of the results of the
analysis to the Department.
(f) If sampling results indicate the presence
of constituents at concentrations that could result in groundwater degradation,
the operator shall submit the following to the Department:
(1) A remedial plan for controlling the
source of leachate in the leachate detection zone and correcting a malfunction
or defect in that liner system, and implement the plan upon Department
approval.
(2) A permit modification
application under §
287.222 (relating to permit
modification) for increased groundwater monitoring, giving consideration to
monitoring frequency, number of wells and other factors, and conduct increased
groundwater monitoring upon Department approval of the
application.
This section cited in 25 Pa. Code §
287.114 (relating to interim
operational requirements for unpermitted processing or disposal facilities); 25
Pa. Code §
287.116 (relating to interim
operational requirements); 25 Pa. Code §
289.512 (relating to liner system
and leachate control plan); 25 Pa. Code §
289.521 (relating to limitations);
25 Pa. Code §
289.531 (relating to scope and
requirements); and 25 Pa. Code §
299.144 (relating to operating
requirements).
