How often should landfill gas be checked?

Quarterly for routine parameters like Methane, Carbon Dioxide, and Oxygen as per Clause 4.3.

What is the action level for methane detected in a monitoring probe at the landfill boundary?

The action level is 1% methane by volume (10,000 ppm) as per Clause 4.4.2.

What is the minimum requirement for groundwater monitoring wells?

A minimum of one monitoring well in the upgradient direction and two in the downgradient direction of the landfill are recommended for the uppermost aquifer (Clause 6.3.1).

How frequently should leachate quality and quantity be monitored?

Leachate quantity should be monitored monthly, and quality should be monitored quarterly according to Clause 5.3.

IS 15411

: 2004

Municipal Solid Waste Management - Guidelines for environmental monitoring of landfills

CurrentSpecializedGuidelinesEnvironmental · Environmental and Sanitation

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This standard provides comprehensive guidelines for the environmental monitoring of municipal solid waste (MSW) landfills. It specifies the parameters, frequency, and methods for monitoring landfill gas, leachate, groundwater, surface water, and ambient air to detect and assess any adverse environmental impact during the active life and post-closure period of a landfill.

Specifies guidelines for environmental monitoring of landfill sites, including air, water, and soil monitoring.

Quick Reference Values

Minimum monitoring frequency for groundwater levelsMonthly

Minimum monitoring frequency for landfill gas (CH4, CO2)Quarterly

Action level for Methane (CH4) at landfill surface500 ppm above background

Action level for Methane (CH4) in perimeter monitoring probes1% by volume

Action level for Volatile Organic Compounds (VOCs) at landfill surface50 ppm above background

Minimum number of groundwater monitoring wells1 upgradient, 2 downgradient

Practical Notes

While this is a key guideline, the legally binding requirements are stipulated in the latest Solid Waste Management (SWM) Rules, which must be followed for compliance.

Establishing accurate pre-operational 'background' levels for groundwater, surface water, and air quality is critical for meaningful comparison with operational data.

The proper location, design, and installation of monitoring infrastructure (gas probes, leachate collection points, monitoring wells) is paramount for obtaining representative samples and reliable data.