the national flood insurance program - el paso county sheriff's
TRANSCRIPT
![Page 1: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/1.jpg)
JESSICA EICHHORST
SOUTHERN ILLINOIS UNIVERSITY EDWARDSVILLE
SUSTAINABLE BIORETENTION
MEDIA STUDY
![Page 2: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/2.jpg)
PROJECT BASIS
• Background
•Bioretention Soil is 60-75% Sand
•Source = “River” Sand
•Sand cost = $8-12/ton
•MSD Cost of Ash Disposal
• MSD Lemay WWTP incinerates biosolids, creates ash
•“Ash” = Non-hazardous
• Silica (sand), Aluminum (trace), Iron (trace)
• Particle size: relatively small % fines2
![Page 3: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/3.jpg)
RESEARCH OBJECTIVE
• Could Lemay ash replace river sand in bioretention
media?
•Hydraulic Conductivity?
•Export of Nutrients & Metals?
•Plant Compatibility?
•Permitting Requirements?
•Lemay Modifications?
• This Project
•Focus = Hydraulic Conductivity
3
![Page 4: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/4.jpg)
MATRIX
Set Mixed Medium Columns
A 75% Sand 25% Compost (Control) 1-3
B 75% Bottom Ash 25% Compost 4-6
C 50% Bottom Ash 50% Compost 7-9
D 75% Bottom Ash 25% Mulch Fines 10-12
E 50% Bottom Ash 50% Mulch Fines 13-15
4
![Page 5: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/5.jpg)
METHODS (1 OF 3)
Column Fabrication
• PVC pipe
• window screen
• 6” pea gravel
• geotextile fabric
• 18” mixed medium
5
![Page 6: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/6.jpg)
METHODS (2 OF 3)
6
![Page 7: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/7.jpg)
METHODS (2 OF 3)
7
![Page 8: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/8.jpg)
RESULTS (1 OF 3)
Test
Average k (in/hr)
A
Sand:Compost
75:25
B
Ash:Compost
75:25
C
Ash:Compost
50:50
D
Ash:Mulch
75:25
E
Ash:Mulch
50:50
1 54.91 ± 7.23 5.42 ± 0.58 6.94 ± 0.64 9.92 ± 1.53 27.74 ± 3.23
2 57.35 ± 7.23 4.55 ± 0.58 5.58 ± 0.64 6.82 ± 1.53 31.16 ± 3.23
3 51.99 ± 7.23 4.19 ± 0.58 6.23 ± 0.64 6.91 ± 1.53 31.83 ± 3.23
4 40.97 ± 7.23 4.19 ± 0.58 5.61 ± 0.64 6.87 ± 1.53 24.87 ± 3.23
8
![Page 9: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/9.jpg)
RESULTS (2 OF 3)
9
![Page 10: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/10.jpg)
RESULTS (3 OF 3)
Grain-size Distribution CurveAverage of Top, Middle, & Bottom 6" for Each Set
0
20
40
60
80
100
120
0.0010.010.11
Grain Diameter (in)
Pe
rce
nt
Pa
ssin
g
Set A
Set B
Set C
Set D
Set E
10
Silt & Clay
![Page 11: The National Flood Insurance Program - El Paso County Sheriff's](https://reader035.vdocument.in/reader035/viewer/2022071600/613d1775736caf36b759368b/html5/thumbnails/11.jpg)
CONCLUSION & FUTURE WORK
• Hydraulic Conductivity
• >1 in/hr (2 ft/day) met
• Conclusion: ash mix
could be acceptable
• Most Promising Mix
50% ash : 50 % mulch
• Future Research
• Plant compatibility
• Nutrient/metals export http://www.mofga.org11