Texas Administrative Code › Title 30 - ENVIRONMENTAL QUALITY › Part 1 - TEXAS COMMISSION ON ENVIRONMENTAL QUALITY › Chapter 330 - MUNICIPAL SOLID WASTE › Subchapter J - GROUNDWATER MONITORING AND CORRECTIVE ACTION › Section 330.417 - Groundwater Monitoring at Type IV Landfills

Current through Reg. 49, No. 28; July 12, 2024
(a) The requirements in this section apply to
				  Type IV landfills, as defined in §
										330.5(a)(2)
				  of this title (relating to Classification of Municipal Solid Waste Facilities),
				  except as provided in §
										330.5(b)
				  of this title, and in subsection (b) of this section.
(b) At the discretion of the executive
				  director, the owner or operator of a Type IV landfill may be required to
				  install groundwater monitoring systems and to monitor on a regular basis the
				  quality of groundwater at the point of compliance.
(1) The factors to be considered by the
				  executive director in determining the need for groundwater monitoring shall
				  include: relationship of the facility to drinking water intakes (both surface
				  and subsurface); hydrogeology of the shallow water-bearing zones in the
				  facility area; use of shallow groundwater in the facility area; type of waste
				  being or to be taken; types of liner; likelihood of leakage of contaminants
				  from the facility; and protection of human health and the
				  environment.
(2) A groundwater
				  monitoring system shall be installed in accordance with §
											330.403
				  of this title (relating to Groundwater Monitoring Systems) except for the point
				  of compliance monitoring well spacing requirement of §
											330.403(a)(2)
				  of this title.
(3) Groundwater
				  sampling and analysis requirements shall be in accordance with §330.405(a)
				  - (d) of this title (relating to Groundwater Sampling and Analysis
				  Requirements).
(4) Each monitoring
				  well or other sampling point shall be sampled and analyzed annually, or on some
				  other schedule but not less frequently than annually as determined by the
				  executive director, for the following constituents: chloride, iron, manganese,
				  cadmium, zinc, total dissolved solids, specific conductance (field and
				  laboratory measurements), pH (field and laboratory measurements), and
				  non-purgeable organic compounds.
(5) Not later than 60 days after each
				  sampling event, the owner or operator shall determine whether the landfill has
				  released contaminants to the uppermost aquifer. The owner or operator shall
				  provide an annual detection monitoring report within 60 days after the
				  facility's annual groundwater monitoring event that includes the following
				  information determined since the previously submitted report:
(A) the results of all monitoring, testing,
				  and analytical work obtained or prepared in accordance with the requirements of
				  this permit, including a summary of background groundwater quality values,
				  groundwater monitoring analyses, any statistical calculations, graphs, and
				  drawings;
(B) the groundwater flow
				  rate and direction in the uppermost aquifer. The groundwater flow rate and
				  direction of groundwater flow shall be established using the data collected
				  during the preceding calendar year's sampling events from the monitoring wells
				  of the Detection Monitoring Program. The owner or operator shall also include
				  in the report all documentation used to determine the groundwater flow rate and
				  direction of groundwater flow;
(C)
				  a contour map of piezometric water levels in the uppermost aquifer based at a
				  minimum upon concurrent measurement in all monitoring wells. All data or
				  documentation used to establish the contour map should be included in the
				  report;
(D) recommendation for any
				  changes; and
(E) any other items
				  requested by the executive director.
(6) The executive director may require
				  additional sampling, analyses of additional constituents, installation of
				  additional monitoring wells or other sampling points, and/or other
				  hydrogeological investigations if the facility appears to be contaminating the
				  uppermost aquifer.
(7) If the owner
				  or operator finds the facility to have contaminated or be contaminating the
				  uppermost aquifer, the executive director may order corrective action
				  appropriate to protect human health and the environment up to and including
				  that in §§
											330.411,
				  330.413, and
				  330.415
				  of this title (relating to Assessment of Corrective Measures; Selection of
				  Remedy; and Implementation of the Corrective Action Program).