Pierre River Mine Project

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WATER ERCB SIRS 46 – 79 Section 7.1 Request 47b Provide Shell’s plans and timelines for completion of the 2018 demonstration lake. Response 47b See the response to ERCB SIR 47a. Request 47c Provide an update on the status of Shell’s demonstration lake. Response 47c See the response to ERCB SIR 47a. Question No. 48 Request Volume 1, Section 13.1, Page 13-22, Supplemental Information Responses. Shell states, “Shell would consider several options if either insufficient water storage capacity or insufficient recycle water quality affected its ability to meet its water requirements.” 48a Discuss Shell’s options to meet water requirements during exceptional low-flow periods. Response 48a See the response to AENV SIR 16. Question No. 49 Request Volume 1, Section 13.1, Page 13-23, Supplemental Information Responses. Shell states, “Evaporation associated with the processing facilities accounts for about 2% of total water consumption. There are no plans to reduce such evaporation.” 49a Why did Shell include “reducing losses to evaporation” in its water management strategies list if there are no plans to reduce such evaporation? Response 49a The conceptual design took into account minimizing losses and developing an efficient production facility. Currently, there are no plans to make changes to the project’s conceptual design. However, during detailed design and operations there will be further opportunities to potentially improve on the overall efficiency of the process, including reducing losses to evaporation. Request 49b Where and how could Shell implement this water management strategy (reducing losses to evaporation)? April 2010 Shell Canada Limited 7-3 CR029
WATER ERCB SIRS 46 – 79 Section 7.1 Response 49b Most of the evaporative losses within the process area result from operating the open-loop cooling tower. During detailed design and operations, opportunities will be sought to find a use for this low-grade heat before it is sent through the cooling tower. This would result in lower evaporative losses. Request 49c Confirm which of the strategies listed in Shell’s water management plan will be implemented. Response 49c Shell intends to implement all of the strategies listed in its water management plan. Question No. 50 Request Volume 1, Section 13.1, Page 13-23, Supplemental Information Responses. Shell states, “The simulation results showed that a system of recovery wells would be effective in capturing the ETDA seepage plume in the surficial deposits and would prevent seepage migration to the Athabasca <strong>River</strong> valley.” 50a Elaborate on the effectiveness of the proposed system to capture vertical seepage underneath surficial deposits. Response 50a Groundwater interception measures for the external tailings disposal area (ETDA) focuses on lateral groundwater flow in the surficial deposits. Vertical seepage from the surficial deposits beneath the ETDA is not predicted to occur at appreciable rates because of the low hydraulic conductivity of the underlying McMurray Formation, as reported in EIA, Volume 4A, Section 6.3.6.2, page 6- 212. Request 50b Elaborate on the additional mitigation measures (besides additional interception wells) that Shell would implement to increase the capture of ETDA seepage into surficial deposits and greater depths. Response 50b The current interception wells are predicted to adequately capture ETDA seepage. However, if further monitoring indicates additional mitigation measures are necessary, these measures would be to: • increase pumping rates, to increase the radius of influence of the interception well or wells • use slurry walls or grouting or both, to provide a barrier to groundwater flow which could be directed to installed interception wells 7-4 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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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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TERRESTRIAL AENV SIRS 44 - 78 Refer
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TERRESTRIAL AENV SIRS 44 - 78 Schne
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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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