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Problem: New wharf to be constructed in Nova Scotia, Canada and as a result will require 35,000m 3 of contaminated soil to be dredged and disposed of. Solution: Build a confined disposal facility (CDF) where the soil can be properly contained and free of harm to humans and the environment. Confined Disposal Facility Department of Civil and Resource Engineering Autodesk. AutoCAD Civil 3D 2016 [computer software]. Autodesk, Inc. San Rafael, CA, USA. Google Maps, 2019. Nova Scotia. Retrieved March 25, 2019. GAEA Technologies Ltd. POLLUTEv7 2016 [computer software]. GAEA Technologies Ltd. Napanee, Ontario, Canada. Rocscsience Inc. Slide 2016 [computer software]. Rocscience Inc. Toronto, Onatrio, Canada. US EPA. Hydrologic Evaluation of Landfill Performance (HELP) 2017 [computer software]. US EPA, Washington, USA. Acknowledgements: We would like to thank Dr. Craig Lake and Matthew Charles Jeffrey Leonard Alex Ayton Paolo Mont Nicole Deveau Kathryn Smith Dalhousie Disposal Solutions 1. Scope of Work 5. References & Acknowledgements 3. Design Process 4. Conclusion & Recommendations 2. Initial Conditions 19 test pits taken, 17 within the proposed footprint Site slopes North to South Site soil is classified as silty sand with gravel, with fracture bedrock and the water table on average 3.2 meters below the ground surface 2a. Dredged Material 2b. Site Location 3c. Leachate Collection System 3d. Cover System 3a. Earth Works Figure 1: Existing disposal cell (blue). Proposed disposal footprint (yellow). (Google Maps, 2019) 3b. Liner System B' B Interior slopes: 2.5:1 Factor of Safety = 1.7 Runout design of 2.5m for geomembrane Geomembrane must have minimum tensile strength of 5.4 kN/m Factor of safety = 1.5 Figure 4: Cell filled with dredge material. Silty sand with gravel (yellow), fractured bedrock (red), dredge material (green). Figure 7: Liner system schematic with 1.5m of silty sand with gravel and 1mm thick geomembrane. Figure 6: Infinite slope analysis components. Figure 5: Seepage analysis for total head. Figure 3: Cross section B-B’ of final design. Existing ground (dotted line). Metals exceeding the Environmental Quality Standards for Contaminated Sites: Cadmium Cobalt Iron Lead Figure 2: Civil 3D CDF Design. Soil Classification: Organic Silt & Silty Sand Hydraulic Conductivity: 10 -4 to 10 -6 cm/s Water Content: 40-50% Bulk Density: 19.8 kN/m 3 Dredged Material Geotextile Filter/Separator Blanket Gravel Layer Figure 9: Cross section from the highest to lowest elevation point. Figure 10: Leachate collection system schematic. Figure 8: Contaminant (Zinc) concentrations into the aquifer over a period of time. Top Berm width: 5m Exterior slopes: 3:1 The CDF can hold a maximum of 48,500 m 3 The berms are capable of encompassing the lateral flow and has an adequate factor of safety greater than the minimum required for permanent slopes. Estimated contamination levels in the aquifer are less than the maximum guidelines. Allowable infiltration through the cover system. Monitor leachate collection system. Collection trucks to periodically pump leachate out of the cell for treatment. Leachate Removal Pipe Model generated using HELP software by US EPA Design allows for infiltration of 15 cm per year
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Problem:
New wharf to be constructed in Nova Scotia,Canada and as a result will require 35,000m3
of contaminated soil to be dredged anddisposed of.
Solution:
Build a confined disposal facility (CDF) wherethe soil can be properly contained and free ofharm to humans and the environment.
Confined Disposal FacilityDepartment of Civil and Resource Engineering
Autodesk. AutoCAD Civil 3D 2016 [computer software]. Autodesk, Inc. San Rafael, CA, USA. Google Maps, 2019. Nova Scotia. Retrieved March 25, 2019. GAEA Technologies Ltd. POLLUTEv7 2016 [computer software]. GAEA Technologies Ltd. Napanee,
Ontario, Canada. Rocscsience Inc. Slide 2016 [computer software]. Rocscience Inc. Toronto, Onatrio, Canada. US EPA. Hydrologic Evaluation of Landfill Performance (HELP) 2017 [computer software]. US EPA,
Washington, USA. Acknowledgements: We would like to thank Dr. Craig Lake and Matthew Charles
Jeffrey LeonardAlex Ayton
Paolo MontNicole Deveau
Kathryn Smith
Dalhousie Disposal Solutions
1. Scope of Work
5. References & Acknowledgements
3. Design Process
4. Conclusion & Recommendations
2. Initial Conditions
19 test pits taken, 17 within the proposedfootprint
Site slopes North to South Site soil is classified as silty sand with gravel,
with fracture bedrock and the water table onaverage 3.2 meters below the ground surface
2a. Dredged Material
2b. Site Location
3c. Leachate Collection System
3d. Cover System
3a. Earth Works
Figure 1: Existing disposal cell (blue). Proposed disposal footprint (yellow).(Google Maps, 2019)
3b. Liner System
B'
BInterior slopes: 2.5:1
Factor of Safety = 1.7
Runout design of 2.5m for geomembrane
Geomembrane must have minimum tensile strength of 5.4 kN/m
Factor of safety = 1.5
Figure 4: Cell filled with dredge material. Silty sand with gravel (yellow), fractured bedrock (red), dredge material (green).
Figure 7: Liner system schematic with 1.5m of silty sand with gravel and 1mm thick geomembrane.
Figure 6: Infinite slope analysis components.
Figure 5: Seepage analysis for total head.
Figure 3: Cross section B-B’ of final design.Existing ground (dotted line).
Metals exceeding the Environmental QualityStandards for Contaminated Sites:
CadmiumCobalt
IronLead
Figure 2: Civil 3D CDF Design.
Soil Classification: Organic Silt & Silty Sand Hydraulic Conductivity: 10-4 to 10-6 cm/sWater Content: 40-50%Bulk Density: 19.8 kN/m3
Dredged Material
Geotextile Filter/Separator
Blanket Gravel Layer
Figure 9: Cross section from the highest to lowest elevation point.
Figure 10: Leachate collection system schematic.
Figure 8: Contaminant (Zinc) concentrations into the aquifer over a period of time.
Top Berm width: 5mExterior slopes: 3:1
The CDF can hold a maximum of 48,500 m3
The berms are capable of encompassing the lateral flow and has an adequate factor of safety greater than the minimum required for permanent slopes.
Estimated contamination levels in the aquifer are less than the maximum guidelines. Allowable infiltration through the cover system. Monitor leachate collection system. Collection trucks to periodically pump leachate out
of the cell for treatment.
Leachate Removal Pipe
Model generated using HELP software by US EPA
Design allows for infiltration of 15 cm per year
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