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Prima Deshecha Odor Study Summary Presentation
(10-15-2013)
Thomas J. Rappolt Vice President and Project Director
SCS Tracer Environmental
Proposed Tasks
• Source Characterization • Wind Analysis (Local and Regional) • Odor Complaints • Odor Impact Modeling – VaLinda Community • Air Transport and Dispersion Analysis • Upgrade/Repair of Met Station • Mitigation Strategies and Recommendations • Community Meetings
Source Characterization Areas of Potential Odor
Source Characterization Other Point Sources of Odors
Odor Sampling of Sources
Surface Media Dispersion Tests INITIAL CONDITIONS
GAS CHROMATOGRAPH
ZER
O
AIR
PLASTIC BUCKET CONTAINING PGM
GAS CHROMATOGRAPH
ZER
O
AIR
Surface Media Dispersion Tests INTRODUCTION OF SMALL AMOUNT OF TRACER
PLASTIC BUCKET CONTAINING PGM
GAS CHROMATOGRAPH
ZER
O
AIR
Surface Media Dispersion Tests DISPERSION OF TRACER THROUGH MEDIA
PLASTIC BUCKET CONTAINING PGM
GAS CHROMATOGRAPH
ZER
O
AIR
Surface Media Dispersion Tests DISPERSION OF TRACER THROUGH MEDIA
PLASTIC BUCKET CONTAINING PGM
GAS CHROMATOGRAPH
ZER
O
AIR
Surface Media Dispersion Tests DISPERSION OF TRACER THROUGH MEDIA
PLASTIC BUCKET CONTAINING PGM
GAS CHROMATOGRAPH
ZER
O
AIR
Surface Media Dispersion Tests BREAKTHROUGH INTO HEADSPACE AND FIRST DETECTION
PLASTIC BUCKET CONTAINING PGM
GAS CHROMATOGRAPH
ZER
O
AIR
Surface Media Dispersion Tests FULL BREAKTHROUGH AND MAXIMUM
CONCENTRATION IN HEADSPACE
PLASTIC BUCKET CONTAINING PGM
GAS CHROMATOGRAPH
ZER
O
AIR
Surface Media Dispersion Tests DECREASE IN CONCENTRATION AFTER PEAK
PLASTIC BUCKET CONTAINING PGM
GAS CHROMATOGRAPH
ZER
O
AIR
Surface Media Dispersion Tests DECREASE IN CONCENTRATION AFTER PEAK
PLASTIC BUCKET CONTAINING PGM
CONCENTRATION vs TIME PLOT OF VERTICAL DIFFUSION
THROUGH WET AND DRY PGM
0
10
20
30
40
50
60
0 50 100 150 200 250 300
Con
cent
ratio
n
Minutes
Vertical Diffusion of Tracer Trough 9" of PGM
Dry
Wet
CONCENTRATION vs TIME PLOT OF VERTICAL DIFFUSION
THROUGH TWO DEPTHS OF CLAY CAP SOIL
0
5
10
15
20
25
30
35
40
45
0 10 20 30 40 50 60 70 80
Con
cent
ratio
n
Minutes
Vertical Diffusion of Tracer Through Clay Soil
3" soil column
6" soil column
SUMMARY OF ESTIMATED VERTICAL DIFFUSION THROUGH THREE LANDFILL CAP MATERIALS
Material Velocity (m/sec)
Dry PGM 0.005
Wet PGM 0.015
Cap Soil 0.006
Solid Waste 0.500
Odor Source Strength Profile
40,085
537,941
1,123,274
16,892 64,968
247,408
7,565 15,525 8,600
SludgeDeposit Area
Working Face Wetted PGM -Covered
Working Face
Dried PGM -Covered
Working Face
Wetted Soil -Flat Area
AsphaultDeposit Area
Service Road CompostOperations(Corrected)
SewerManholeCovers
(Corrected)
Source Strength (D/T*m3/sec) Source Strength (D/T*m3/sec)
Odor Source Strength Profile (Omit Wet PGM)
40,085
537,941
16,882 16,892 64,968
247,408
7,565 15,525 8,600
SludgeDeposit Area
Working FaceWetted PGM -Covered
Working Face
Dried PGM -Covered
Working Face
Wetted Soil -Flat Area
AsphaultDeposit Area
Service Road CompostOperations(Corrected)
SewerManholeCovers
(Corrected)
Source Strength (D/T*m3/sec) Source Strength (D/T*m3/sec)
Annual Wind Rose Plots El Toro Mission Viejo
1st Quarter Wind Rose Plots El Toro Mission Viejo
2nd Quarter Wind Rose Plots El Toro Mission Viejo
3rd Quarter Wind Rose Plots El Toro Mission Viejo
4th Quarter Wind Rose Plots El Toro Mission Viejo
Meteorological Monitoring Summary Existing Weather Station: • Installed New WS And WD Sensors And Sensor Cables At Existing Weather Station. • Reprogrammed Data Logger To Operate With New Sensors. • Reprogrammed Data Logger To Record 5-min Averages. • Calibrated Sensors And Verified Proper Operation Of Data Logger.
Temporary Weather Station: • Installed Temporary Weather Station In “The Saddle” For The Purpose Of Comparing The Existing Locations Weather Parameters To That In The Saddle As Well As To Better Understand Transport Characteristics From The Landfill To The Community. • SCS Tracer and OCWR Determined That The Existing Weather Station Is Not Adequate For Describing Transport From The Facility To The Community.
Weather Station Relocation
• The Sensors/Data Loggers/Solar Power Assembly/Cables From The Current Fixed Weather Station Have Been Removed From The Existing Tower Following An “As Is” Calibration. • SCS Tracer Will Re-install And Calibrate The System Following Re-installation Of The Tower In “The Saddle” by OCWR. At That Point, The Temporary Weather Station Will Be Removed.
Data Comparisons: 9/4/13
0
50
100
150
200
250
300
350
0:00 2:24 4:48 7:12 9:36 12:00 14:24 16:48 19:12 21:36 0:00
Site #1: Wind Direction
Site #2: Wind Direction
0
2
4
6
8
10
12
14
0:00 2:24 4:48 7:12 9:36 12:00 14:24 16:48 19:12 21:36 0:00
Site #1: Wind Speed
Site #2: Wind Speed
Data Comparisons: 9/5/13
0
2
4
6
8
10
12
14
0:00 2:24 4:48 7:12 9:36 12:00 14:24 16:48 19:12 21:36 0:00
Site #1: Wind Speed
Site #2: Wind Speed
0
50
100
150
200
250
300
350
0:00 2:24 4:48 7:12 9:36 12:00 14:24 16:48 19:12 21:36 0:00
Site #1: Wind Direction
Site #2: Wind Direction
Estimated Trajectories Sea Breeze Regime
Estimated Trajectories Sea Breeze Regime
Terrain Influences on Turbulence
Tracer Gas Release Locations
Sampling Locations
Tracer Study Results
0.00E+00
1.00E-05
2.00E-05
3.00E-05
4.00E-05
5.00E-05
6.00E-05
7.00E-05
8.00E-05
9.00E-05
Site Impacts Working Face Emissions
Sept 5, 2013
Site 2
Site 3
Site 4
Site 5
Site 6
Site 7
Site 8
Site 9
(sec
/m^3
)
Tracer Study Results
0.00E+00
1.00E-05
2.00E-05
3.00E-05
4.00E-05
5.00E-05
6.00E-05
7.00E-05
8.00E-05
9.00E-05
Site Impacts Cell C -1 Emissions
Sept 5, 2013
Site 2
Site 3
Site 4
Site 5
Site 6
Site 7
Site 8
Site 9
Site 10
(sec
/m^3
)
Tracer Study Results
-2.00E-06
0.00E+00
2.00E-06
4.00E-06
6.00E-06
8.00E-06
1.00E-05
1.20E-05
1.40E-05
(sec
/m^3
)
Chi/Q (sec/m^3) Averages of All Sites Except #2
Sept 4, 2013
Cell C - 3
Working Face
2 per. Mov. Avg. (Cell C - 3)
2 per. Mov. Avg. (WorkingFace)
Tracer Study Results
• Dispersion increases as a function of distance – as expected.
• Impacts at the Saddle are at Maximum • Once Airflow Breaches Saddle then Mixing is
Enhanced – helps lower impacts. • Odors from Gate Area do not Impact Community • Odors from the Compost Facility do not Impact the
Community. • Modeled Dispersion Rates are Slightly Lower than
the Tracer Data Indicate – Models Over-predict.
Odor Modeling Summary • AERMOD Model
– Developed by the U.S. EPA – Approved by the SCAQMD
• Source Information – Locations and Dimensions – Odor Emission Rates (Odor Concentration * Flow Rate) – Total of 17 Sources Modeled
• 5 Years of Meteorological Data (SCAQMD Mission Viejo Station 2005-2009)
• Shuttle Radar Topography Mission (SRTM) Terrain Data • Modeling Predicted the Worst Case Odor Impacts at the Key
Residential Area North of the Facility
Modeled Scenarios
• Scenarios Examined: 1. Entire facility with wet PGM on the working area 2. Same as #1 except switched from wet PGM to dry PGM
on the working area 3. Same as #2 except reduced the area of the working face
by 50% 4. Same as #2 except relocated the working area &
working face to the east 5. Same as #3 except reduced the dry PGM odor
concentration by about 50% 6. Same as #2 except completely eliminated the working
face odors
Modeled Results Summary Maximum Potential Impacts – 5 years
Scenario Scenario Notch Residential
Ave Max.
No. Description (%) (%)
1 All sources (Wet PGM) – Present Status 100 100
2 All sources (Dry PGM) 74 52
3 All sources (50% Working Face Area, Dry PGM) 69 28
4 All sources (Relocated Full Working Face/Areas, Dry PGM) 81 45
5 All sources (50% Working Face Area, 50 D/T Dry PGM) 69 28
6 All sources (Dry PGM, No Working Face) 69 5
Note: Highest Measured Odor Concentration at Notch is 10 D/T
Recommendations • Dry vs Wet PGM • Lay-down Area for New PGM in Eastern areas of the Landfill. • Reduce the Exposed Size of the Working Face – Garbage
Placement Area. • Increase Thickness of the Cover Material – Dried PGM or
multiple layers. • Some Timing Considerations to Waste Handling, but may not
provide net benefits. • Use Some Type of Air Stripping Systems to Slow Venting of
Working Face. • Reduce the Amount of Bio-Solid Sludges Deposited into the
landfill (minimal effect).
