The actual constituents in ...

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The actual constituents in the groundwater leachate and in the landfill gas emitting from any landfill will be a direct result of the materials originally buried there. Unless you took samples of both early in the degradation phase it will be very difficult to estimate to what degree the original constituents have degraded.  The US EPA has a lot of information available on their website for landfills. You might want to search there for data. I believe the primary methods utilized for characterizing the contaminants are GC and GC/MS to get most of the volatile and semi-volatile compounds.

Good Luck.