Pierre River Mine Project

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WATER ERCB SIRS 46 – 79 Section 7.1 Figure ERCB 75-4: Piezometer Locations – McMurray Formation – Basal Aquifer April 2010 Shell Canada Limited 7-33 CR029
WATER ERCB SIRS 46 – 79 Question No. 76 Request Appendix 4-1, Section 1.2.2.2, Page 26. Section 7.1 Shell states, “The Sewetaken Fault property zone (Figures 10 to 12) was introduced to reflect the possible influence of this fault on the groundwater flow regime.” Shell further states, “A uniform specific storage value of 3.5 x 10-5 m-1 was applied to all model layers” and “The base of the local and regional groundwater flow models was also defined as a no-flow boundary condition.” 76a Does the Sewetaken Fault extend to the Fort McMurray formation and further to the top overburden formations? Response 76a The Sewetakun Fault does not extend to the McMurray or overburden formations. Since the Sewetakun Fault occurs on the Precambrian surface and appears to influence hydraulic heads in the Middle Devonian aquifers, the Sewetakun Fault property zone was only implemented in the model layers (layers 10 through 12) representing Devonian Formations (see EIA, Appendix 4-1, Section 1.2.2.3, page 26). Request 76b What were the geophysical techniques used to delineate the vertical and horizontal geological structures within the project area? Response 76b The Sewetakun Fault occurs at a depth below that expected for hydrogeological interaction with project activities, so no delineation of this structural feature was deemed necessary. Request 76c How does a low specific storage value of 3.5 x 10-5 m-1 reflect the higher Storativity values for the Quaternary formations (unconfined aquifers)? Response 76c In the numerical model (MODFLOW), the layer type for the upper three of four layers representing the Quaternary formations was specified to be Type 3. In MODFLOW, a Type 3 model layer means that the transmissivity of the layer varies based on the saturated thickness and hydraulic conductivity of the aquifer and that the storage coefficient can vary between confined (specific storage) and unconfined (specific yield) values. Therefore, if the model calculated the water level in a cell to be below the top of the cell, the storage value would be represented by the specific yield. In the upper three layers of the model, the specific yield value was 0.1. Request 76d Why were constant head values not assigned to the local and regional model boundaries instead of the no-flow boundary? 7-34 Shell Canada Limited April 2010 CR029
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Application for Approval of the Pie
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PIERRE RIVER MINE SUPPLEMENTAL INFO
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CONTENTS LIST OF ILLUSTRATIONS Tabl
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INTRODUCTION OVERVIEW Table 1-1: Gu
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INTRODUCTION NAVIGABLE WATERS Secti
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INTRODUCTION NAVIGABLE WATERS Secti
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Section 2.2 ERRATA EIA, EIA UPDATE
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Section 2.2 ERRATA EIA, EIA UPDATE
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Section 2.3 ERRATA SUPPLEMENTAL INF
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Section 2.3 ERRATA SUPPLEMENTAL INF
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MINING AND PROCESSING ERCB SIRS 3 -
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AIR ERCB SIRS 40 - 45 Request 41b B
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AIR ERCB SIRS 40 - 45 Table ERCB 41
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WATER AENV SIRS 15 - 43 Decay Rates
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WATER AENV SIRS 15 - 43 Section 12.
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WATER AENV SIRS 15 - 43 Question No
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WATER AENV SIRS 15 - 43 Data Type N
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WATER AENV SIRS 15 - 43 Figure AENV
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WATER AENV SIRS 15 - 43 Figure AENV
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WATER AENV SIRS 15 - 43 • tempera
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TERRESTRIAL AENV SIRS 44 - 78 Refer
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TERRESTRIAL AENV SIRS 44 - 78 Revis
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TERRESTRIAL AENV SIRS 44 - 78 Commo
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TERRESTRIAL AENV SIRS 44 - 78 Schne
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HEALTH AENV SIRS 79 - 89 Question N
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EPEA APPROVALS AENV SIRS 90 - 96 Qu
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GLOSSARY CEAA The abbreviation for
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GLOSSARY ESR The abbreviation for e
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GLOSSARY landform The configuration
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GLOSSARY OSDG The abbreviation for
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GLOSSARY SEWG The abbreviation for
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