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 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 §
271.231 (relating to equivalency
review procedure), the leachate detection zone of a liner system shall meet the
following design requirements:
(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 secondary
liner and the primary liner equal to or more permeable than 1 x
10-2 cm./sec. based on a 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.
(5) The piping system shall also meet the
following:
(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.
(6) The leachate detection zone shall have a
minimum bottom slope of 2%.
(7)
Contain stone or aggregates without 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:
(1) Immediately 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, on a
quarterly basis, for pH, specific conductivity, total organic carbon, chloride,
total alkalinity, ammonia-nitrogen and chemical oxygen demand. 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 liner collection area per day or more than 10% of
leachate generation, the operator shall:
(1)
Submit to the Department within 30 days a plan 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 §
273.284 (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 degradation of groundwater, the operator shall:
(1) Submit to the Department a remedial plan
for controlling the source of leachate in the leachate detection zone, and
implement the plan upon Department approval.
(2) Submit to the Department a permit
modification application under §
271.222 (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 §
273.161 (relating to liner system
and leachate control plan); 25 Pa. Code §
273.251 (relating to scope and
requirements); 25 Pa. Code §
273.282 (relating to number,
location and depth of monitoring points); and 25 Pa. Code §
285.123 (relating to
impoundments-general).
