Are Zero Clearance Landfill Gas

Probes for Your Site?

Ambrose A. McCready, P.E.

April 12, 2016

54th Annual SWANA Western Regional

Symposium

San Luis Obispo, California

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Monitoring Requirements

• CCR Title 27 §20921

• Perimeter Compliance Monitoring Probes

• Multiple Stages

• Perforated Zones

• Depth to Perched or High Groundwater

• Cost to Replace Probe $5-10 K

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Zero Clearance

• What is Zero Clearance Condition?

• Old Landfill Units

• Waste Placed to Permitted Boundary

• No Buffer Between Waste and Boundary

• Can Not Drill Probe Without Hitting Waste

• Does Not Meet Title 27 Requirements

• What are Possible Solutions?

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Zero Clearance LFG Probes

• Large Diameter Boring with Clean Backfill

• Standard Title 27 LFG Probe in Center

• Drill with Special Boring Equipment

• Backfill with Select Material

• Monitor as Compliance Probe

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The Possible Solution

• Zero Clearance LFG Probes are a Solution

• Construct Probes on Your Site

• Approved by CalRecycle at 28th Street LF

• Talk to Agency/Obtain Regulatory Approval

• Construct With Select Materials

• Perform Like Standard Title 27 LFG Probes

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