Hydrogeological Level 1 and Level 2 Assessments
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HYDROGEOLOGICAL LEVEL 1 AND LEVEL 2 ASSESSMENTS PROPOSED MAES PIT Part Lots 1 and 2, Concession 2, Township of Middlesex Centre (Forme rly Lobo Township), County of Middlesex, Ontario JOHNSTON BROS. (BOTHWELL) LIMITED Prepared for: Johnston Bros. (Bothwell) Limited 21220 Johnston Line, RR1, Wardsville, Ontario N0L 2N0 Prepared by: Novaterra Environmental Ltd. 39 Winship Close London, Ontario N6C 5M8 May 24, 2017 HYDROGEOLOGICAL LEVEL 1 AND LEVEL 2 ASSESSMENTS PROPOSED MAES PIT Part Lots 1 and 2, Concession2, Township of Middlesex Centre (Formerly Lobo Township), County of Middlesex, Ontario JOHNSTON BROS. (BOTHWELL) LIMITED Prepared for: Johnston Bros. (Bothwell) Limited 21220 Johnston Line, RR1, Wardsville, Ontario N0L 2N0 Prepared by: Novaterra Environmental Ltd. 39 Winship Close London, Ontario N6C 5M8 May 24, 2017 ______________________________ Cover page photograph: Aerial photograph showing the Site and surrounding area, obtained from Google Earth. Imagery date: October 22, 2015. Eye altitude 2.43 km. Hydrogeological Level 1 and Level 2 Assessment Proposed Maes Pit –Township of Middlesex Centre May 24, 2017 TABLE OF CONTENTS Page 1.0 INTRODUCTION..............................................................................................................1 1.1 Background..................................................................................................................... 1 1.2 Scope and Methodology ................................................................................................. 1 1.2.1 Aggregate Resource Act Requirements ................................................................ 1 1.3 The Current Use of the Site ............................................................................................ 2 2.0 SITE PHYSICAL FEATURES ........................................................................................2 2.1 Location and Site Description......................................................................................... 2 2.2 Topography and Drainage............................................................................................... 3 2.3 Natural Heritage Feature................................................................................................. 3 2.4 Adjacent Land Use.......................................................................................................... 3 2.5 Field Investigation and Instrumentation ......................................................................... 4 3.0 GEOLOGY.........................................................................................................................5 3.1 Bedrock Geology ............................................................................................................ 5 3.2 Quaternary Deposits........................................................................................................ 5 3.3 Subsurface Condition at the Site..................................................................................... 5 3.3.1 Aggregate Material Thickness .............................................................................. 6 3.3.2 Structure Contours on Sandy Silt.......................................................................... 6 4.0 HYDROGEOLOGY..........................................................................................................6 4.1 Regional Hydrogeology.................................................................................................. 6 4.2 Site Hydrogeology and Water Table Aquifer ................................................................. 6 4.3 Shallow Groundwater Flow and Hydraulic Gradient .................................................... 7 4.4 Water Level Fluctuations................................................................................................ 8 4.5 Surface Water Courses and Water Bodies ...................................................................... 8 4.6 Relationship Between Groundwater and Local Watercourse ......................................... 9 4.7 Groundwater and Surface Water Use ............................................................................. 9 4.8 Groundwater Temperature Profiles............................................................................... 10 4.9 Chemical Quality of Groundwater................................................................................ 11 5.0 PROPOSED OPERATION AND POTENTIAL IMPACT .........................................12 5.1 Proposed Mining of Aggregate Deposits...................................................................... 12 5.2 Final Land Use.............................................................................................................. 12 5.3 Water Budget and Assessment of Potential for Groundwater Impact .......................... 13 5.4 Thermal Condition in Komoka Creek and On-Site Ponds............................................ 14 5.5 Potential for Thermal Impact on Komoka Creek.......................................................... 14 5.6 Potential for Cumulative Impact................................................................................... 15 6.0 CONTINGENCY PLAN AND MITIGATION MEASURES......................................15 7.0 MONITORING PROGRAM..........................................................................................16 8.0 CONCLUSIONS ..............................................................................................................17 ii Hydrogeological Level 1 and Level 2 Assessment Proposed Maes Pit –Township of Middlesex Centre May 24, 2017 9.0 RECOMMENDATIONS.................................................................................................18 10.0 REFERENCES.................................................................................................................20 11.0 LIMITATIONS................................................................................................................22 LIST OF FIGURES Figure 1 Subject site, well locations, topography and hydrology map .................................... 24 Figure 2 Existing features......................................................................................................... 25 Figure 3 Quaternary geology map............................................................................................ 26 Figure 4 Regional cross-s ection A-A ’...................................................................................... 27 Figure 5 Local cross-sections B-B ’ and C- C’ .......................................................................... 28 Figure 6 Thickness of sand and gravel..................................................................................... 29 Figure 7 Surface elevations of sandy silt and silty sand........................................................... 30 Figure 8 Inferred depth to groundwater below ground surface................................................ 31 Figure 9 Thickness of saturated sand and gravel...................................................................... 32 Figure 10 Inferred high groundwater table configuration (March 2017)................................... 33 Figure 11 Inferred low groundwater table configuration (October 2016).................................. 34 Figure 12 Depth to groundwater hydrographs and precipitation................................................ 35 Figure 13 Water level elevation hydrographs and precipitation ................................................ 36 Figure 14 Groundwater temperature profiles for MW1 and MW2 ............................................ 37 Figure 15 Groundwater temperature profiles for MW3 and MW4 ............................................ 38 Figure 16 Groundwater temperature profiles for MW5 ............................................................. 39 Figure 17 Water temperature in Komoka Creek and onsite ponds at Maes Pit ......................... 40 Figure 18 Final rehabilitation plan ............................................................................................. 41 iii Hydrogeological Level 1 and Level 2 Assessment Proposed Maes Pit –Township of Middlesex Centre May 24, 2017 Page LIST OF TABLES Table 1 Summary of information on local domestic wells obtained during door-to- door survey in the vicinity of Maes Pit................................................................... 43 Table 2 Wells construction data and depths to water levels in monitoring wells, Komoka Creek, and Ponds at Maes Pit ................................................................... 44 Table 3 Water level elevations in monitoring wells, Komoka Creek, and Ponds at Maes Pit ................................................................................................................... 46 Table 4 Geological and hydrogeological data at monitoring wells and test pits at Maes Pit used to construct five figures in the hydrogeological report .................... 47 Table 5 Groundwater temperature profiles in monitoring wells at Maes Pit ....................... 48 Table 5.1 Thermal Condition in Komoka Creek and on-site ponds........................................ 14 Table 6 Water level and temperature measurements in surface water bodies and watercourse at Maes Pit........................................................................................... 51 Table 7 Results of groundwater quality analyses in MW2, MW3 and MW5 at Maes Pit ... 52 APPENDICES APPENDIX A Figure 6 Vegetation Communities from Natural Environment