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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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Presentation Transcript
slide2

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
slide3

INFORMATION GATHERING

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