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Central Lake Ontario Conservation Authority

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Central Lake Ontario Conservation Authority CCeennttrraall LLaakkee OOnnttaarriioo CCoonnsseerrvvaattiioonn AAuutthhoorriittyy RReeggiioonnaall GGrroouunnddwwaatteerr MMaappppiinngg SSttuuddyy Groundwater Resource Inventory Paper Technical Report-May 2004 Prepared by: G. SooChan (CLOCA) Disclaimer Every effort has been made to ensure the accuracy of the information contained in this report. The Central Lake Ontario Conservation Authority, however, assumes no responsibility for the correctness of the information contained in this study, nor liability to any user of the information regardless of the purpose. CLOCA Regional Groundwater Mapping Study Executive Summary Under the Province of Ontario’s Clean Water Strategy, the Ontario Geological Survey (OGS) of the Ministry of Northern Development & Mines (MNDM) has established a program of groundwater mapping to delineate and characterize the major groundwater aquifers in southern Ontario. The program is intended to generate information in support of initiatives such as watershed management, land use planning and source water protection. One of the projects under this program is the generation of a series of watershed-based Groundwater Resource Inventory Papers (or GRIPs). The goal of the GRIP project is to generate and distribute a series of final reports that describe the groundwater systems and their interactions within individual watersheds. Each GRIP report contains a series of maps with basic hydrogeological mapping information of the watershed, along with a description of these maps within the watershed. The prototype for GRIP studies is the long-term groundwater study completed by the Grand River Conservation Authority (GRCA) (Grand River Regional Groundwater Study, 2001). The CLOCA Groundwater Study represents one of the first of these studies to be completed under the GRIP project. The CLOCA Groundwater study made use of the newly developed YPDT (York Peel Durham Toronto) Groundwater Study hydraulic database as well as several map products developed under that initiative. CLOCA is one of the participants in the YPDT study. The large proportion of groundwater data stored within the database came from the Ministry of Environment (MOE) Water Well Information system (WWIS). The geographical location and elevation attributes of the WWIS were systematically reviewed and corrected prior to its use in this study. Several general characterization maps were produced plotting attribute data stored within the water well records. These maps provide general information about the groundwater systems and the use of groundwater resources within the study area. Additionally, a series of interpolated surface maps for the study area were produced. These maps are intended to provide geological, hydrogeological and aquifer sensitivity information to aid decision makers in: • locating of new sources of potable groundwater; • delineating sensitive ecological areas; and • developing environmental policies for land-use planning. The study area can be divided into three physiographic settings, which include: • The Oak Ridges Moraine trending west-east along the northern part of the study area; • The South Slope till plain situated south of the Oak Ridges Moraine; and • The Lake Iroquois shoreline and plain situated in the southern part of the study area along the Lake Ontario shore. i CLOCA Regional Groundwater Mapping Study The Oak Ridges Moraine is an interlobate glacial deposit meaning that it was deposited between two lobes of a glacier (Ontario and Simcoe ice lobes). This rhythmically bedded interlobate deposit consists mainly of sand and gravel though areas of clay till overlying the sands have been observed. The South Slope physiographic region lies at the base of the moraine. The South Slope is described as a drumlinized area, which consists of thin (~1 m thick) aeolian sand deposits underlain by glacial till. The most southerly physiographic region within the study area is the Lake Iroquois Plain. The Plain is made up of a band of beach deposits formed at the shoreline of the ancestral lake and a lacustrine plain extending to Lake Ontario that represent lake bottom deposits smoothed by wave action. The major findings of this report are as follows: • The Oak Ridges Moraine is a feature of great importance to the flow system throughout the study area. The absence of surficial drainage over much of the Oak Ridges Moraine supports statements regarding the importance of this area to recharge functions. Groundwater discharge occurs along the flanks of the Oak Ridges Moraine where the infiltrating waters of the sandy moraine come in contact with underlying less permeable materials. This discharge is important in the development of headwaters to all of the major watersheds in the study area. Depletion or contamination of the resource in this area could lead to impacts throughout the study area. • The Iroquois Beach deposits locally represent a shallow aquifer system along the south- central part of the watershed that still serves as a potable drinking water source for many smaller communities in the study area. These deposits also provide groundwater discharge to streams in areas where stream valleys cut through the deposits into the underlying till. Groundwater seeps are often observed along Lake Iroquois shoreline slopes. These deposits are, however, thin with very high water tables and can be easily contaminated, which in turn can result in impacts to the streams and aquatic life. • Geological modeling and mapping for the study area indicates that the geological formations in the area represent a complex sequence of deposition and erosion. Erosional channels have been delineated both on the surface of the Newmarket Till aquitard and on the bedrock surface. Groundwater flow through the channels in the Newmarket Till is dependent on the nature of the infill materials, which range from clay to gravel. Bedrock channels are important controls on the deeper flow systems and may provide a source for municipal supplies as some of these bedrock valleys may be filled with coarse-grained permeable material. • Vulnerability mapping based on the Ontario Ministry of the Environment AVI methodology for the study area generally confirms earlier report findings. According to the MOE’s AVI method, the most vulnerable areas are the Oak Ridges Moraine and the Iroquois Beach physiographic regions. There are areas within those regions, however, that map as less sensitive. Factors discussed such as the type and thickness of geological material and the depth to the water table, account for these variations. Previously it was common for these regions to be completely labelled as vulnerable. ii CLOCA Regional Groundwater Mapping Study Acknowledgements Appreciation is expressed to the YPDT study group and the staff of Earthfx Inc. whose advice during the development of this report proved invaluable. Assistance with the analysis of the water quality snapshot data and the preparation of this section of the report, was provided by Steve Davies (CAMC). Acknowledgement and thanks are extended. Special thanks are extended to The Ontario Federation of Agriculture (Baseline Water Well Quality Program) and Dr. Mary Jane Conboy for assistance provided under the GRIP water Quality Snapshot Program. Thanks are extended to the following individuals who reviewed and provided comments during the development of this report: P. Lapcevic (Grand River Conservation Authority), P. Sarvas (MNDM), S. Davies & S. Holysh (CAMC), R. Gerber (Gerber Geosciences Inc.) Finally, the author wishes to acknowledge CLOCA staff that provided assistance during the preparation of this report. Special mention goes to Aidan McConkey, Jonathan Staples, James Booth and Margaret Stauffer for their help in the preparation, review, formatting and editing of the report as well as in the formatting and preparation of maps. iii CLOCA Regional Groundwater Mapping Study C O N T E N T S 1.0 Introduction ........................................................................................................... 1 1.1 Physical Setting ............................................................................................ 3 1.2 Physiography ................................................................................................ 4 1.3 Drainage ........................................................................................................ 5 1.4 General Land Use ......................................................................................... 5 1.5 Surficial/Quaternary Geology ....................................................................... 6 1.5.1 Glaciolacustrine Deposits ................................................................ 7 1.5.2 Glaciofluvial Deposits ...................................................................... 8 1.5.3 Glacial Deposits ............................................................................... 8 1.5.4 Recent Deposits ................................................................................ 9 1.5.5. Structural Geologic Model ............................................................... 10 1.6 Bedrock Geology .......................................................................................... 15 2.0 Groundwater Mapping ......................................................................................... 17 2.1 Introduction................................................................................................... 17 2.1.1 Data Sources ...................................................................................
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