Lysimeter Study Approach

Lysimeter Study Approach

• Simulate landfill disposal of CCA

• 6 PVC Columns

• 22 feet high, 1-Foot diameter

• Natural Precipitation or DI water infiltrates through a cap and creates leachate

Disposal Scenarios

• CCA Monofill

• Construction and Demolition (C&D) Landfill

• Municipal Solid Waste (MSW) Landfill

FRONT LYSIMETER VIEW SIDE LYSIMETER VIEW

CONCRETE

BLOCKS

SUPPORT

POST

STRAPPING STRAPPING

TREATMENT

PLANT RAILING

GROUND LEVEL

12” 12”

21’

CONCRETE

PAD

20’ WASTE

20’ WASTE

CATCHMENT

BASINS

DRAINAGE

MATERIAL DRAINAGE

MATERIAL

12”

Lysimeters

• Lysimeter 1 – Untreated wood

• Lysimeter 2 – CCA: 50% old, 50% new

• Lysimeter 3 – Typical C&D mix

• Lysimeter 4 – C&D w/CCA

• Lyimeter 5 – MSW w/untreated wood

• Lysimeter 6 – MSW w/CCA

Monitoring

• Lysimeters began operation on August 28 (Wood, C&D) and September 27, 2001 (MSW)

• Weekly temperature taken inside the lysimeters at 3 different depths (5, 10, 19 feet from the top of waste)

• Record volume and characterize gas produced– Test gas with Landtec Gem 500 (methane,

CO2)

Leachate Collection

• Collect leachate twice monthly and analyze for general water quality parameters and As, Cu, and Cr

Preliminary Results

• Weekly Temp monitoring fluctuates with ambient temps

• Weekly gas monitoring – methane detected up to 60% in MSW lysimeters

• Leachate generated from all lysimeters

• Metals found in Lysimeters w/CCA– Lys 2 - 9/28/2001– Lys 4 - 6/25/2002– Lys 6 - 7/17/2002

Lysimeter 2 – 100% CCA

0

10

20

30

40

50

60

mg

/L

Arsenic

CopperChromium

Lysimeter 4 – C&D w/ 10% CCA

0

0.5

1

1.5

2

2.5

mg

/L

ArsenicCopper

Chromium

Lysimeter 6 – MSW w/ 2% CCA

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

7/3/

2002

7/23

/200

2

8/12

/200

2

9/1/

2002

9/21

/200

2

10/1

1/20

02

10/3

1/20

02

11/2

0/20

02

12/1

0/20

02

12/3

0/20

02

mg

/L

ArsenicCopperChromium

Lysimeter Leachate pH

3

4

5

6

7

8

9

7/28/2001 11/5/2001 2/13/2002 5/24/2002 9/1/2002 12/10/2002 3/20/2003

pH

Lys 1

Lys 2

Lys 3

Lys 4

Lys 5

Lys 6

CCA

UT Wood

C&D

MSW

Arsenic

0.1

1

10

100

mg

/L

CCA

MSW-CCA

C&D-CCA

Chromium

0.1

1

10

100

7/28

/200

1

9/16

/200

1

11/5

/200

1

12/2

5/20

01

2/13

/200

2

4/4/

2002

5/24

/200

2

7/13

/200

2

9/1/

2002

10/2

1/20

02

12/1

0/20

02

1/29

/200

3

mg

/L

CCA

MSW-CCA

C&D-CCA

Copper

0.01

0.1

1

10

7/28

/200

1

9/16

/200

1

11/5

/200

1

12/2

5/20

01

2/13

/200

2

4/4/

2002

5/24

/200

2

7/13

/200

2

9/1/

2002

10/2

1/20

02

12/1

0/20

02

1/29

/200

3

mg

/L

CCA

MSW-CCA

C&D-CCA

Operation

• Lysimeters will continue operation through spring and summer– DI water added as needed– Temp and Gas readings taken weekly– Leachate collection twice monthly and

continued analysis for general water quality parameters and As, Cu, Cr