When Creek Meets Valley Wall: Prioritizing Erosion Mitigation alongside the Oshawa Landfill
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2 When Creek Meets Valley Wall: Prioritizing Erosion Mitigation alongside the Oshawa Landfill Robin McKillop 1, Dan McParland 1 & Cassie Scobie 2 TRIECA conference March 22-23, Palmer Environmental Consulting Group Inc. 2 Regional Municipality of Durham
3 Outline Background Assessment approach Erosion site inventory Prioritization and design of mitigation
4 BACKGROUND 4
5 Oshawa Landfill Operational from 1960s until 1979 Located in former sand/gravel pit Capped in 1980; now just site of transfer station City of Oshawa Lake Ontario CH2MHILL (2013)
6 Ritson Road North Oshawa Landfill Transfer station Oshawa Landfill Approximate refuse limit Clovers Road
7 Durham s role Responsible for monitoring and maintenance since closure in 1979 Ensure continued protection of surrounding natural environment Durham/CLOCA identified local instabilities and seepage areas along Oshawa Creek and tributary Seepage inventory Isolated seepage mitigation and erosion protection works ( Green Wall ) Recognized need to inventory, assess and mitigate erosion risks
8 ASSESSMENT APPROACH 8
9 Objective To conduct an integrated fluvial and slope erosion assessment alongside the Oshawa Landfill as a basis for inventorying, prioritizing and mitigating erosion sites determined to pose long-term risk to integrity of landfill perimeter
10 Channel-valley wall interaction 1. Creek erodes material at base of valley wall 3. Lower valley wall fails and deposits material 2. Valley wall oversteepens
11 Procedure 1. Background review Surficial geology mapping, borehole logs, groundwater data Historical and recent aerial photography Reach delineation Reach-scale field reconnaissance Fluvial processes focus, modes of adjustment, erosion site ID, channel stability Site-specific investigations Examination and characterization of contributory failure mechanisms e.g. seepage/undercutting (integration of consideration of geotechnical principles) Measurement of failure geometry
12 Geological setting From: Ontario Geological Survey Glacial Lake Iroquois shoreline B B From: CH2MHILL (2013) B B
13 Procedure 1. Background review Surficial geology mapping, borehole logs, groundwater data Historical and recent aerial photography Reach delineation 2. Reach-scale field reconnaissance Fluvial processes focus, modes of adjustment, erosion site identification, channel stability assessment 3. Site-specific investigations Examination and characterization of contributory failure mechanisms (e.g. seepage/undercutting) Measurement of failure geometry
14 EROSION SITE INVENTORY 14
15 Erosion site inventory
16 Erosion site inventory 16 sites, representing three forms of instability 2 creek cut-banks 9 slope-toe failures 5 gullies Principal drivers of instability Channel down-cutting and migration Groundwater seepage and piping of fine sediments Uncontrolled surface runoff
17 Erosion = lateral + vertical
18 SITE CHARACTERISTICS SLOPE EROSION DIMENSIONS Type Slope failure width (m) Toe-slope failure 20 Proximity to approx. refuse limit (m) Slope failure height (m) Property Slope failure steepness ( o ) Region 45 Material Interbedded outwash sand/gravel Seepage influence Moderate [Seep B (i), (ii)] Gully top width (m) n/a Gully depth (m) n/a Watercourse Reach Gully bottom steepness ( o ) 3 - Headwater Tributary (Upper) n/a Bankfull channel dimensions (m) Gully length (m) 3.7 (W) & 0.9 (D) n/a Description Undercutting of the toe of the valley wall, along the outer bank of a meander, has led to shallow slumping within interbedded glaciofluvial sands and gravels underlain by laminated glaciolacustrine silt. Groundwater seeps from the bank at the contact between the glaciofluvial and glaciolacustrine sediments. Without intervention, continued erosion of the valley wall may pose a risk to landfill embankment stability. Site-specific data summaries Project: Oshawa Landfill Erosion Mitigation Project number: Client: Regional Municipality of Durham Site 1
19 PRIORITIZATION AND DESIGN OF MITIGATION 19
20 Basis for prioritization Proximity to refuse limit Severity of slope erosion Valley wall cross-sectional geometry
21 SITE 1 SITE 7 5 high-priority sites SITE 10 SITE 11 SITE 15
22 Design criteria Ensure long-term stability of valley wall surrounding landfill Arrest existing erosion Avoid exacerbating or triggering new erosion (as consequence of mitigative works) Minimize impacts to, or enhance, aquatic and riparian ecosystems
23 Evaluation of alternatives 3 alternatives per site + do nothing Evaluation criteria In-stream and floodplain hydraulics Fluvial processes and slope erosion Valley wall seepage and aesthetics Ecological sensitivities Environmental permitting requirements Capital and maintenance costs
24 Communication with CLOCA Early engagement (study approach) Key findings and report available Detailed and simplified evaluation tables Concept plans detailed designs
25 Site 1 concept plan Grade-control riffles Slope-toe protection & habitat complexing Drainage stone to intercept seepage Minor realignment away from valley wall Compensatory cut along inner bank
26 Next steps Detailed design, permitting & tendering Underway Implementation Summer 2017 construction Sites 1, 10 & 11? Summer 2018 Sites 7 & 15? Construction supervision
27 Questions?
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