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MONITORING SYSTEM EVALUATION

MONITORING SYSTEM EVALUATION. INFORMATION GATHERING. Review previous LFG inspection reports Identify specific probes to be sampled Obtain monitoring system maps & as-built drawings Check probe depths & location with respect to extraction wells. INFORMATION GATHERING.

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MONITORING SYSTEM EVALUATION

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  1. MONITORING SYSTEM EVALUATION

  2. INFORMATION GATHERING • Review previous LFG inspection reports • Identify specific probes to be sampled • Obtain monitoring system maps & as-built drawings • Check probe depths & location with respect to extraction wells

  3. INFORMATION GATHERING • Review LFG monitoring probe design • Consider type, quantity & depth of waste • Consider proximity of receptors • Make sure all probes are functional

  4. INFORMATION GATHERING Determine if probes are properly placed • At (within 2 feet) the permitted (property boundary) • At a point of compliance • At a point approx. midway between LFG control wells • At a proper spacing & depth • Adjacent to critical receptors

  5. LFG SCREENING MONITORING

  6. Basic Conversions • 5% Methane in air = 50,000 PPM Remember that 1% = 10,000 ppm • 1.25% Methane in air = 12,500 PPM • 100% of the Lower Explosive Limit (LEL)= 5% Methane in Air • 25% of the LEL=1.25% Methane in Air

  7. ACRONYMS AND SYMBOLS CONT. • PPM - PARTS PER MILLION • % O2 - PERCENT OXYGEN • CO - CARBON MONOXIDE • H2S - HYDROGEN SULFIDE • LEL - LOWER EXPLOSIVE LIMIT • UEL - UPPER EXPLOSIVE LIMIT

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