AREA A/B ENGINEERING REPORT - Waste Management

Geosyntec Consultants
updated despite the fact that a number of researchers (e.g., Sullivan & Michels, 2000; Barlaz, et
al, 2004) have demonstrated declining trends for VOC levels in LFG since that time (similar to the
case with data for XOC concentrations in leachate, as described in Section A2.1.4). Importantly,
a report by the Los Angeles County Sanitation District showed an overall exponential decline in
VOC emissions in LFG over a ten-year monitoring program (Huitric, 1999). A follow up study
(Huitric, et al, 2001) obtained test results from 75 landfills over a two year period and found that
current trace constituent levels are two to four times less than default values.
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