MONITORING SYSTEM EVALUATION
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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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Monitoring system evaluation

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


Monitoring system evaluation

INFORMATION GATHERING

  • Review LFG monitoring probe design

  • Consider type, quantity & depth of waste

  • Consider proximity of receptors

  • Make sure all probes are functional


Monitoring system evaluation

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


Monitoring system evaluation

LFG SCREENING MONITORING


Basic conversions

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


Acronyms and symbols cont

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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