North Carolina Administrative Code › Title 15A - Environmental Quality › Chapter 13 - SOLID WASTE MANAGEMENT › Subchapter B - SOLID WASTE MANAGEMENT › Section .0500 - DISPOSAL SITES › Section 13B .0544 - MONITORING PLANS AND REQUIREMENTS FOR C&DLF FACILITIES

Current through Register Vol. 39, No. 2, July 15, 2024
(a) The owner or operator of a C&DLF unit
				  shall submit a water quality monitoring plan to the Division in the application
				  for the permit to construct in accordance with Rule .0535(a)(1) of this Section
				  that shall apply to all C&DLF units. The water quality monitoring plan
				  shall be prepared in accordance with this Rule, and shall include information
				  on the proposed groundwater monitoring systems, surface water sampling
				  locations, sampling and analysis requirements, and detection monitoring
				  requirements provided in Paragraphs (b) and (c) of this Rule.
(b) Groundwater monitoring shall be as
				  follows:
(1) A groundwater monitoring system
				  shall be installed that consists of no less than one background and three
				  downgradient wells installed at locations and depths that yield groundwater
				  samples from the uppermost aquifer that:
(A)
				  represent the quality of the background groundwater that has not been affected
				  by leakage from the unit. Determination of background water quality shall be
				  based on sampling of a well or wells that are hydraulically upgradient of the
				  waste management area. However, the determination of background water quality
				  may include sampling of wells that are not hydraulically upgradient of the
				  waste management area where hydrogeologic conditions do not allow the owner and
				  operator to determine which wells are hydraulically upgradient, or
				  hydrogeologic conditions do not allow the owner and operator to place a well in
				  a hydraulically upgradient location, or sampling at other wells will provide an
				  indication of background groundwater quality that is as representative as that
				  provided by the upgradient well(s); and
(B) represent the quality of groundwater
				  passing the relevant point of compliance as approved by the Division. The
				  downgradient monitoring system shall be installed at the relevant point of
				  compliance to ensure detection of groundwater contamination in the uppermost
				  aquifer. The relevant point of compliance shall be established no more than 250
				  feet from a waste boundary, or shall be at least 50 feet within the facility
				  property boundary, whichever point is closer to the waste boundary. In
				  determining the relevant point of compliance, the Division shall consider
				  recommendations made by the owner and operator based upon consideration of at
				  least the hydrogeologic characteristics of the facility and surrounding land;
				  the quantity, quality, and direction of flow of the groundwater; the proximity
				  and withdrawal rate of the groundwater users; the existing quality of the
				  groundwater, including other sources of contamination and their cumulative
				  impacts on the groundwater, and whether the groundwater is currently used or
				  expected to be used for drinking water; public health, safety, and welfare
				  effects; and practicable capability of the owner and operator.
(C) A water quality monitoring plan shall
				  include consistent sampling and analysis procedures that are designed to ensure
				  monitoring results that provide an accurate representation of groundwater
				  quality at the background and downgradient wells. The plan shall include
				  procedures and techniques for sample collection; sample preservation and
				  shipment; chain-of-custody control; and quality assurance and quality
				  control.
(D) The detection
				  groundwater monitoring program shall include sampling and analytical methods
				  for groundwater sampling that accurately measure target constituents and other
				  monitoring parameters in groundwater samples. Detection monitoring shall be
				  conducted at C&DLF units at all groundwater monitoring wells that are part
				  of the detection monitoring system as established in the approved water quality
				  monitoring plan. The detection groundwater monitoring program shall include
				  monitoring for the constituents listed in Appendix I of
				  40 CFR
				  258, and the following constituents: mercury,
				  chloride, manganese, sulfate, iron, specific conductance, pH, temperature,
				  alkalinity, and total dissolved solids. The monitoring frequency for all
				  detection monitoring constituents shall be no less than annual during the
				  active life of the facility, and during closure and the post-closure period. To
				  establish baseline, no less than four independent samples from each background
				  and downgradient monitoring well shall be collected within a twelve-month
				  period and analyzed for the constituents required in this Paragraph, with no
				  less than one sample collected from each new monitoring well before waste
				  placement in each new cell or phase. The water quality monitoring plan shall
				  include a description of the procedures used to establish baseline at the
				  C&DLF unit. No less than one sample from each background and downgradient
				  monitoring well shall be collected and analyzed during subsequent annual
				  sampling events. C&DLF units shall comply with the groundwater quality
				  standards and interim maximum allowable concentrations (IMACs) set forth in
				  15A NCAC
				  02L .0202 and the groundwater protection
				  standards established in Rule .0545(c) of this Section.
(E) The sampling procedures and frequency
				  shall be protective of human health and the environment.