lecture08

lecture08 - LECTURE 8 SOURCE CONTROL AND MANAGEMENT OF...

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Unformatted text preview: LECTURE 8 SOURCE CONTROL AND MANAGEMENT OF MIGRATION Classes of Site Remediation Source control Technologies to contain or treat sources of contamination (wastes or contaminated soil) Management of migration Technologies to control the movement of contaminants away from sources (usually in ground water) Cover systems (caps) Prevent physical contact and exposure to waste Sufficient cap may be enough thickness of soil to prevent humans or animals from digging into waste Reduce (or almost eliminate) precipitation infiltration Reduces/prevents transport of contaminants to ground water by infiltrating water Landfill Cover Layers Source: Federal Remediation and Technologies Roundtable, February 12, 2003. 4.30 Landfill Cap (Soil Containment Remediation Technology). ederal Remediation and Technologies Roundtable, February 12, 2003. 4.30 Landfill Cap (Soil Containment Remediation Technology). ttp://www.frtr.gov/matrix2/section4/4_30.html . Accessed February 26, 2003. Cap layers: Vegetation Purposes: Erosion control Infiltration reduction by evapotranspiration Characteristics: Shallow rooted plants Low nutrient needs Drought and heat resistant Source: Federal Remediation and Technologies Roundtable, February 12, 2003. 4.30 Landfill Cap (Soil Containment Remediation Technology). Cap layers: soil layer Purposes: Support vegetation Protect underlying layers Typically 60-cm thick Crushed stone or cobbles may substitute in arid environments Source: Federal Remediation and Technologies Roundtable, February 12, 2003. 4.30 Landfill Cap (Soil Containment Remediation Technology). Cap layers: Protection layer Also called biotic barrier 90-cm layer of cobbles to stop burrowing animals and deep roots Not always included Source: Federal Remediation and Technologies Roundtable, February 12, 2003. 4.30 Landfill Cap (Soil Containment Remediation Technology). Cap layers: Filter layer Prevents clogging of drainage layer by fines from soil layer May be geosynthetic filter fabric or 30-cm sand Source: Federal Remediation and Technologies Roundtable, February 12, 2003. 4.30 Landfill Cap (Soil Containment Remediation Technology). Cap layers: Drainage layer Minimizes contact between infiltrated water and low K layers below Prevents ponding of water on geomembrane liner Drains by gravity to toe drains At least 30 cm of sand with K = 10-2 cm/sec or equivalent geosynthetic Source: Federal Remediation and Technologies Roundtable, February 12, 2003. 4.30 Landfill Cap (Soil Containment Remediation Technology). Cap layers: Low K layer Composite liner: both geomembrane and low-K soil (clay) Low K prevents infiltration of water into waste: hydraulic barrier Geomembrane: at least 0.5 mm (20-mil ) thick Compacted clay: at least 60 cm with K 10-7 cm/s Source: Federal Remediation and Technologies Roundtable, February 12, 2003. 4.30 Landfill Cap (Soil Containment Remediation Technology). Cap layers: Gas vent layer Needed if waste will generate methane (explosive) or toxic gas...
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lecture08 - LECTURE 8 SOURCE CONTROL AND MANAGEMENT OF...

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