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10/5/14
1
LEACHATE Good To the Last Drop
WHAT ARE WE GOING TO COVER What is Leachate? Where does Leachate come from? How do we manage Leachate? How do we measure Leachate levels? How to identify the Point of Compliance? How to calculate Compliance? What happens to the Leachate collected?
10/5/14
2
WHAT IS LEACHATE?
Coffee?
Organic Vegetable Soup?
Garbage Juice?
ALL OF THE ABOVE!!
WHERE DOES LEACHATE COME FROM?
Rain
Incoming Waste
Recirculated Liquids
Introduced Liquids
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How Much Leachate Is Generated
A 1-inch Rainstorm
Falling on an Active Working Face
(50-feet by 100-feet)
Generates 3,116 Gallons of Leachate
Liners
Collection Layer
Collection Trenches
Collection Lines
Leachate Sumps
Leachate Collection Risers
Leachate Pumps
Geosynthetic Clay Liner
Geocomposite
Flexible Membrane Liner
Compacted Soil Subgrade
Protective Soil Cover
HOW DO WE MANAGE LEACHATE? Solid Waste
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Liners
60-mil High Density Polyethylene
Collection Layer
200-mil Geonet with 10-oz Geotextile or Soil Drainage Layer
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Collection Trench Geotextile wrapped and Aggregate filled
Collection Lines
Perforated HDPE Pipe placed in Trench
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Leachate Sump
Geotextile wrapped, Aggregate filled
Leachate Collection Riser
HDPE Pipe up slope from Leachate Sump
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Leachate Pump
MEASURING LEACHATE
Level Indicator
Sounding
Water Tape
Dedicated Transducer
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MEASURING LEACHATE DEPTH
Level Indicator Sounder
Water Tape
Most Accurate CHEAPEST Alternative
MEASURING LEACHATE DEPTH Dedicated Transducer
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A Demonstration
How To Measure Leachate Compliance SUMP 1
Riser Length = 65-Feet
ALWAYS MEASURE THIS Compliance Length = 50.0 Feet Provided by Site Design Engineer
SUMP
PROTECTIVE SOIL LAYER 1-Foot
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Leachate Level Calculations GIVEN: Riser Length = _____ Feet Compliance Length = _____ Feet
MEASURE: Riser Length = _____ Feet Length to Leachate = _____ Feet
CALCULATE: Compliance Length =_____ Feet -Length to Leachate =_____ Feet
Compliance Calculation ____ Feet
65.0 50.0
65.0 CHECKED
(Non-Compliant if Positive)
SUMP 1
Provided by Site Engineer
How To Measure Leachate Compliance SUMP 1
Measure Length to Leachate = 47.5 Feet
SUMP
PROTECTIVE SOIL LAYER
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Leachate Level Calculations GIVEN: Riser Length = _____ Feet Compliance Length = _____ Feet
MEASURE: Riser Length = _____ Feet Length to Leachate = _____ Feet
CALCULATE: Compliance Length =_____ Feet -Length to Leachate =_____ Feet
Compliance Calculation Feet
65.0 50.0
65.0 47.5
50.0 47.5
(Non-Compliant if Positive)
NOT COMPLIANT
MORE THAN ONE FOOT
OF LECHATE ON LINER
+2.5
SUMP 1
How To Measure Leachate Compliance SUMP 2
Riser Length = 33.1-Feet
ALWAYS MEASURE THIS
SUMP
PROTECTIVE SOIL LAYER
Compliance Length = 25.6 Feet Provided by Site Design Engineer
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Leachate Level Calculations GIVEN: Riser Length = _____ Feet Compliance Length = _____ Feet
MEASURE: Riser Length = _____ Feet Length to Leachate = _____ Feet
CALCULATE: Compliance Length =_____ Feet -Length to Leachate =_____ Feet
Compliance Calculation ____ Feet
33.1 25.6
33.1 CHECKED
(Non-Compliant if Positive)
SUMP 2
Provided by Site Engineer
How To Measure Leachate Compliance SUMP 2
Measure Length to Leachate = 31.5 Feet
SUMP
PROTECTIVE SOIL LAYER
10/5/14
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Leachate Level Calculations GIVEN: Riser Length = _____ Feet Compliance Length = _____ Feet
MEASURE: Riser Length = _____ Feet Length to Leachate = _____ Feet
CALCULATE: Compliance Length =_____ Feet -Length to Leachate =_____ Feet
Compliance Calculation Feet
33.1 25.6
33.1 31.5
25.6 31.5
(Non-Compliant if Positive) -5.9
COMPLIANT
LESS THAN ONE FOOT
OF LECHATE ON LINER SUMP 2
How To Measure Leachate Compliance Manhole 3
Compliance Length = 54.5 Feet Provided by Site Design Engineer
SUMP
PROTECTIVE SOIL LAYER
Riser Length = 57.5-Feet ALWAYS MEASURE THIS
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Leachate Level Calculations GIVEN: Riser Length = _____ Feet Compliance Length = _____ Feet
MEASURE: Riser Length = _____ Feet Length to Leachate = _____ Feet
CALCULATE: Compliance Depth =_____ Feet -Length to Leachate =_____ Feet
Compliance Calculation Feet
57.5 54.5
57.5 CHECKED
MANHOLE 3
(Non-Compliant if Positive)
Provided by Site Engineer
How To Measure Leachate Compliance MANHOLE 3
Measure Length to Leachate = 55.1 Feet
SUMP
PROTECTIVE SOIL LAYER
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COMPLIANT
LESS THAN ONE FOOT
OF LECHATE ON LINER Leachate Level Calculations
GIVEN: Riser Length = _____ Feet Compliance Length = _____ Feet
MEASURE: Riser Length = _____ Feet Length to Leachate = _____ Feet
CALCULATE: Compliance Length =_____ Feet -Length to Leachate =_____ Feet
Compliance Calculation _____ Feet
57.5 53.5
57.5 55.1
53.5 55.1
-1.6 (Non-Compliant if Positive)
MANHOLE 3
LEACHATE DISPOSAL
Evaporation
Recirculation
Off-Site Disposal
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Leachate Evaporation Pond
Leachate Recirculation
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Off-Site Disposal
WHAT WE COVERED
What is Leachate? Where does Leachate come from? How do we manage Leachate? How do we measure Leachate levels? How to identify the Point of Compliance? How to calculate Compliance? What happens to the Leachate we collect?
10/5/14
18
QUESTIONS
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