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06-096DEPARTMENT OF ENVIRONMENTAL PROTECTION

these analyses must be submitted with the application.

(e)For a solid waste facility, other than a landfill, that is required to have a water quality monitoring program, analyses must be conducted during the first two sampling rounds for the Column 2 parameters reasonably expected to be present in any wastes to be handled at the solid waste facility in a manner which could allow leachate to enter ground or surface water. Subsequent sampling rounds must be for the Column 1 parameters plus any Column 2 parameters detected in the first two sampling rounds.

(2)Detection Monitoring. The data obtained through the site characterization monitoring program and, for landfills, the nature of leachate generated by the same or a similar landfill, must be used to establish the list of detection parameters for the solid waste facility. The purpose of detection monitoring is to detect changes in water quality throughout the active life of the facility and through the closure and post closure periods.

(a)Detection monitoring at a landfill must be conducted for the parameters listed in Column 1 of Appendix 405.A, plus any Column 2 parameters determined to be present during leachate characterization, site characterization monitoring, and as required in subparagraph (e) or (f), below.

(b)Detection monitoring at a solid waste facility other than a landfill must be conducted for the parameters listed in Appendix 405.A, Column 1 plus any Column 2 parameters determined to be present during site characterization monitoring.

(c)Sampling frequency for detection monitoring at an active solid waste facility must include three sampling events per year collected during spring (March/April), summer (July/August) and fall (October/November), unless an alternative frequency is approved or required by the Department, based on site-specific characteristics.

(d)Sampling frequency may be reduced to twice yearly (spring and fall) at an active solid waste facility at which ground water velocity is calculated to be less than 10 feet/year using conservative assumptions. Conservative assumptions must include the steepest gradient observed for the hydrogeologic unit, the maximum hydraulic conductivity measured in the hydrogeologic unit, and a maximum effective porosity for flow of 0.1, unless site-specific information or other pertinent data exists to establish a greater porosity.

(e)A landfill without the capability of monitoring a leachate detection system and/or a leachate collection system must include annual monitoring of the Column 2 parameters in the landfill’s detection monitoring program.

(f)A landfill having the capacity to monitor a leachate detection system and/or a leachate collection system must monitor the leachate for the Column 2 parameters in the facility's leachate detection system and/or leachate collection system at least annually.

(g)Parameters consistently undetected in a facility’s leachate, or in results from its ground water monitoring network, may be deleted from detection monitoring upon approval by the Department. Certain major ions and complex ions (sodium, potassium, magnesium, calcium, iron, bicarbonate, sulfate, and chloride) may not be deleted from a detection monitoring program.

(h)Sampling frequency and parameters for detection monitoring at a landfill which does not qualify for closure under the reduced closure procedure of 38 MRSA. Section 1310-E(2) or the

Chapter 405: Water Quality Monitoring, Leachate Monitoring, and Waste Characterization

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