Lower Mainland Surficial Geology From Wisconsin Ice Age to Protocol 21
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1 Lower Mainland Surficial Geology From Wisconsin Ice Age to Protocol 21 BCEIA BEST Conference 2018 Whistler, BC Kalina Malowany and Virginie Brunetaud
2 Presentation Outline 1. Surficial Geology it s more than just a map! 2. Wisconsin Glaciation Present: A brief synopsis of sediments in the Lower Mainland 3. Distribution of Sediments and determining the Stratigraphy 4. Why consider the detailed geology of your site and P21 applicability? 5. Key Conclusions
3 Introduction Surficial Geology It s more than what you see at the surface! Complex surficial geology in the Lower Mainland Thick sedimentary package overlying bedrock Glacial, fluvial and bog deposits; varying porosity, organic content and mineralogy. GSC Map 1486A, Surficial Geology, 1980
4 Wisconsin Glaciation 75,000 to 11,000 BP Cordilleran ice sheet Covered all of BC Ice more than 2km thick Ice sheet repeatedly advancing and receding Tide water glaciers/ice sheets in the Straight of Georgia Sea level is low due to water locked on land in ice sheet Glacial maximum approximately 25,000 years ago Cordilleran ice sheet 25,000 years ago (Clague, J., & Turner, B., 2003)
5 Glacial Maximum Advance 25,000 years ago Homathko Icefield, BC Ice Cover in Lower Mainland, at its maximum extent (Clague, J., & Turner, B., 2003)
6 Cordilleran Ice Sheet Retreat Rapid glacial melting to deglaciation between 18,000 and 11,000 years ago Lower Mainland during retreat of Cordilleran Ice Sheet (Clague, J., & Turner, B., 2003)
7 Meltwaters and Glacial Outwash Receding Glacier Bridge Glacier Outwash Plain, BC Till Unsorted materials (silt, sand, gravel and boulders) produced by glacial erosion, entrained by glacial drift and dumped as glacier melts Outwash Sands and gravel transported by rivers (melted ice) and deposited ahead of glacier (Diagram from Girard, F., Ghienne, J. F., and Rubino, J. L., 2012)
8 After the Ice Age Most glaciers retreated into mountains. Sea level was 200 m higher than present, at end of Ice Age. Sea retreat caused by rebound of land. After ice disappeared, the Fraser River extended its floodplain and delta as sea retreated. Pitt Meadows towards Pitt Lake. Fraser River floodplain advanced and filled Pitt Valley, isolating Pitt Lake from the Straight of Georgia.
9 Sediments in the Lower Mainland GSC Map 1486A, 1484A, 1485A, and 1487A, Surficial Geology of New Westminster, Mission and Chilliwack, 1980
10 Lower Mainland Surficial Geology North Richmond Burnaby Delta Coquitlam Surrey Pitt Meadows Mission Chilliwack Lithostratigraphic Units (Armstrong, 1984) Langley Abbotsford Vashon Drift Glacial till, glaciofluvial and glaciolacustrine (lake) deposits. Till is grey hardpan/dense silt with sand lenses. Glaciofluvial sandy gravel outwash. 30 to 60 m thick. Vashon Drift till Stanley Park
11 Lower Mainland Surficial Geology North Richmond Burnaby Coquitlam Surrey Pitt Meadows Mission Chilliwack Delta Langley Abbotsford Capilano Sediments Raised marine, deltaic and fluvial deposits; beach sands, marine and non marine silts, and river sands, with gravel; typically 3 to 30 m thick but can be as thick as 60 m. Outcrop Stanley Park
12 Lower Mainland Surficial Geology North Richmond Burnaby Delta Coquitlam Surrey Pitt Meadows Mission Chilliwack Lithostratigraphic Units (Armstrong, 1984) Langley Abbotsford Fort Langley Formation Ice contact, outwash, glacial and marine sediments; composing sandy loam, silty sand, sandy gravel and marine shales; similar to the Capilano deposits; typically found in the east of Langley and is 8 to 90 m thick.
13 Lower Mainland Surficial Geology North Richmond Burnaby Delta Coquitlam Surrey Pitt Meadows Mission Chilliwack Lithostratigraphic Units (Armstrong, 1984) Langley Abbotsford Sumas Drift Glacial outwash deposits containing sands and gravels with lenses of silt; typically 5 to 40 m thick.
14 Lower Mainland Surficial Geology North Richmond Burnaby Delta Coquitlam Surrey Pitt Meadows Mission Chilliwack Lithostratigraphic Units (Armstrong, 1984) Langley Abbotsford Fraser River Sediments Deposits from the Fraser River, including: sand channels, organic silt and sand over bank deposits; up to 40 m thick. Fraser River organic silt (top) and sand channel deposit (bottom), Coquitlam
15 Lower Mainland Surficial Geology North Richmond Burnaby Delta Coquitlam Surrey Pitt Meadows Mission Chilliwack Lithostratigraphic Units (Armstrong, 1984) Langley Abbotsford Salish Sediments Bog and Lake deposits; silty loam and peat; typically 2 14 m thick. Salish peat, Coquitlam
16 Lower Mainland Surficial Geology Pre Vashon Deposits Glacial, non glacial and glaciomarine sediments: Quadra glaciofluvial and fluvial channel sand and gravel; Coquitlam till, glaciomarine and glaciolacustrine deposits; Cowichan Head fluvial, organic colluvial and swamp sediments; Pre Vashon Deposits Semiahmoo till, glaciofluvial, glaciomarine and glaciolacustrine deposits; Highbury fluvial and swamp deposits; Westlyn glaciofluvial sandy gravel. Lithostratigraphic Units (Armstrong, 1984)
17 Lower Mainland Surficial Geology North Richmond Burnaby Delta Coquitlam Surrey Pitt Meadows Mission Chilliwack Mount Seymour, BC Langley Abbotsford Bedrock Sandstone, siltstone and shale at low elevations (near sea level); granites and other volcanic rocks form the uplands and the North Shore Mountains.
18 Why Is It Important? Planning for field investigation CSR Protocol 21 Drinking Water Applicability In the field Report writing Other considerations
19 Know What to Expect Before You Go Check surficial geology maps AND cross sections. You will encounter units that are not at the surface. What is the elevation? Lowland or Upland? What is the target depth? Fluvial or glacial deposits? How close is the Fraser River? Till or outwash deposits? Is bedrock expected?
20 Lowlands or Uplands? North Burnaby Coquitlam Pitt Meadows Richmond Surrey Mission Chilliwack Delta Langley Abbotsford Distribution of the three majors landscapes in the Lower Mainland
21 Know What to Expect Before You Go Check surficial geology maps AND cross sections. You will encounter units that are not at the surface. What is the elevation? Lowland or Upland? What is the target depth? Fluvial or glacial deposits? How close is the Fraser River? Till or outwash deposits? Is bedrock expected?
22 Lowlands Stratigraphy Upland Lowland Richmond SEA LEVEL Bedrock Pre Vashon Sediments Vashon Drift Capilano Sediments Fraser River Sediments Salish Sediments Diagrammatic North South Cross Section of the Fraser River Delta at (GSC Map 1486A, Surficial Geology, 1980) Mitchell Island
23 Uplands Stratigraphy Quadra Sands Outcrop UBC Schematic East West Stratigraphic Cross Section through Surrey (Gartner Lee Limited, 2004)
24 Know What to Expect Before You Go Check surficial geology maps AND cross sections. You will encounter units that are not at the surface. What is the elevation? Lowland or Upland? What is the target depth? Fluvial or glacial deposits? How close is the Fraser River? Till or outwash deposits? Is bedrock expected?
25 CSR Protocol 21 Drinking Water Applicability Is there an aquifer present? Drinking Water Aquifer: Saturated unconsolidated geological units with yields greater or equal to 1.3L/min or hydraulic conductivity greater or equal to 1 x 10 6 m/s. Is the aquifer protected? Natural confining barrier: Type A: Geological unit with hydraulic conductivity less than 1 x 10 7 m/s and minimum thickness of 5 m. Type B: Geological unit with hydraulic conductivity between 1 x 10 7 m/s and 1 x 10 6 m/s and ratio thickness/hydraulic conductivity greater than 5 x 10 7 s.
26 Lowlands Aquifers and Aquitards Upland Aquifer Aquitard Lowland Richmond SEA LEVEL Bedrock Pre Vashon Sediments Vashon Drift Capilano Sediments Fraser River Sediments Salish Sediments Diagrammatic Cross Section of the Fraser River Delta at Mitchell Island (GSC Map 1486A, Surficial Geology, 1980)
27 Uplands Aquifers and Aquitards Aquifer Aquitard Water Table Schematic east west stratigraphic cross section through Surrey (Gartner Lee Limited, 2004)
28 In the Field Is what you see what you expected? Is it consistent with regional surficial geology? Does what you see make sense? There is very little clay in till; if you think it s clay, it s probably silt! Capilano Sediments or Vashon Drift? Capilano Sediments and Fort Langley Formation were former marine deposits; look for gypsum and shells!
29 Report Writing Link field observation with regionally mapped stratigraphic units. Is site geology consistent with regionally mapped aquifers? Check on imap BC or Water Resources Atlas. Unit Core Sample Field Description Logged Geologic Unit 1 Dark grey silt, minor sand and gravel, trace roots Regional Geological Interpretation Hydrostratigraphic Unit FILL Fill Fill Aquitard 2 Organic peat, reddish brown, fibrous, stiff, wet PEAT Salish bog sediments Peat Aquitard 3 Organic silt, dark brown, trace wood debris, stiff, wet SILT Fraser River overbank sediments Silt Aquitard 4 Fine to medium grained sand grey, well sorted, loose, wet SAND Fraser River channel sediments Sand Aquifer 5 Grey fine sand, some silt, minor gravel, very dense, wet TILL Vashon Drift Till Aquitard
30 Other Considerations Natural background concentrations: Geological units can provide some information on groundwater geochemistry. Groundwater flow and contaminant Fraser River migration. Salish Sediments Sediments Drilling methods can vary depending on geological units. Clay Peat Sand & Fill Remediation remediation techniques. Silt Dissolved Arsenic Concentrations (µg/l) in Groundwater by Screened Soil Type (Goddard, 2017)
31 Key Conclusions Complex depositional processes. Lower Mainland surficial geology comprised of glacial, fluvial and marine deposits. Check surficial geology maps AND cross sections. You will encounter units that are not at the surface. Saturated outwash deposits represent good aquifers. Link field observations with regional geology. Fraser River Delta
32 References Armstrong, J.E, Environmental and Engineering Applications of the Surficial Geology of the Fraser Lowland, British Columbia. Geological Survey of Canada, Paper Clague, J. and Turner, B., 2003., city on the edge: living with a dynamic geological landscape. Gartner Lee Limited, Surrey Groundwater Strategy Phase II Part 1 Groundwater Exploration Plan. GLL Prepared for City of Surrey. Geological Survey of Canada Surficial Geology. MAP 1484A, 1485A, 1486A and 1487A. Compiled by Armstrong J.E. & Hicock S.R. Department of Energy, Mines, and Resources. Girard, F., Ghienne, J. F., and Rubino, J. L., Channelized sandstone bodies ( cordons ) in the Tassili N Ajjer (Algeria & Libya): snapshot of a Late Ordovician proglacial outwash plain. Geological Society, London, Special Publication, 368, Goddard, M.L., The baseline arsenic concentration in the groundwater of the Fraser River Delta, British Columbia, Canada. Master thesis.
33 Thank You! Questions? Presenters Contact Information: Kalina Malowany, MSc/GIT Hydrogeologist Core6 Environmental Ltd., Virginie Brunetaud, MSc/AAg Hydrogeologist Core6 Environmental Ltd.,
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