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06-096DEPARTMENT OF ENVIRONMENTAL PROTECTION

possible, have detection limits which do not exceed one half the MCL or the MEG for each respective parameter.

C.Types of Water Quality Monitoring Programs. The information below describes the various types of monitoring programs and when they must be implemented. The detection and assessment parameters to be analyzed at a landfill must be based upon those found to be present during characterization of the leachate generated by the solid waste facility, those found to be present through ground and/or surface water characterization monitoring, and those identified by the Department as reliable indicator parameters. For a solid waste facility other than a landfill, the water quality monitoring program must be based on the specific types of wastes handled at the facility.

The parameter list for water quality monitoring is found in Appendix 405.

(1)Site Characterization Monitoring. A site characterization monitoring program must be conducted at any new, expanded or existing active, inactive or closed solid waste landfill at which water quality monitoring is required, to establish the parameters to be monitored, and their concentrations as currently found in ground and surface water in the vicinity of the solid waste facility. At existing landfills, site characterization monitoring is required prior to performing detection monitoring. Existing landfills which have previously conducted site characterization monitoring and have ongoing ground and surface water quality monitoring programs found by the Department to have met the applicable water quality monitoring requirements of the May, 1989 solid waste regulations, are exempt from the ground and surface water characterization requirements of this subsection. The site characterization monitoring program at solid waste facilities other than landfills must be determined on a case-by-case basis based on the siting, design, and operations plan, and the physical and chemical characteristics of wastes to be handled at each solid waste facility.

(a)Four or more independent samples from each ground and surface water sample point approved by the Department for the characterization program are required for proper characterization of water quality. The actual number of independent samples required for water quality characterization at a sample point must be based on the rate of ground water flow, data quality and/or variability of results. Sampling events must include the extremes of seasonal water level fluctuation (yearly high and low ground water).

(b)For existing solid waste landfills which accept exclusively MSW, characterization analyses of samples from the first two sampling rounds must be conducted for the Appendix 405.A, Column 2 parameters. Subsequent sampling rounds must be for the Column 1 parameters, plus any Column 2 parameters detected in the first two sampling rounds.

(c)For all other existing solid waste landfills, characterization analyses for the first two sampling rounds must be conducted for the Column 2 parameters, less any Column 2 parameters demonstrated by analyses not to be present in or derived from leachate generated at the facility which is being characterized. Such demonstration must consist of "non-detect" results, using laboratory methods approved by the Department for the given parameter(s) for the four most recent sampling rounds of analyses for representative and independent samples of leachate generated by the solid waste facility. For landfills without the capability of monitoring a leachate detection system and/or a leachate collection system, characterization analyses for the first two sampling rounds must be conducted for the Column 2 parameters.

(d)For proposed solid waste landfills, analyses must be conducted for the Column 2 parameters during the first two sampling rounds. Subsequent sampling rounds must be for the Column 1 parameters plus any Column 2 parameters detected in the first two sampling rounds. Results of

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

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