Pierre River Mine Project

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WATER AENV SIRS 15 – 43 Section 12.1 • ongoing and potentially increased instantaneous diversion of groundwater sources • use of untreated recycle water for gland water • reducing bitumen production to reduce water consumption These options individually or in combination could be used to complement Shell’s proposed raw water storage. Request 16b Discuss their feasibility and rank them. Response 16b Each of the contingency options discussed in the response to AENV SIR 16a may be technically feasible. However, the choice and ranking will be highly dependent on the prevailing environmental and mine operating circumstances. Currently, it would be speculative to comment on the preferred ranking. Question No. 17 Request Volume 2, SIR 271, Page 21-11. Shell states An evaluation of options for ETDA subsurface seepage control was conducted for the closure stage of the facility. 17a Provide a comparable assessment of various subsurface seepage control alternative (including liners) against interception pumping wells option taking into consideration its sustainability, efficiency, and maintenance requirements. Response 17a Shell’s proposed seepage management plan involving a series of recovery wells was determined to provide a high degree of efficiency in permeable soils and a wide degree of operational flexibility. Table AENV 17-1 compares the ETDA seepage management alternatives against the requirements for sustainability, efficiency, and maintenance. April 2010 Shell Canada Limited 12-5 CR029
WATER AENV SIRS 15 – 43 Table AENV 17-1: Comparison of ETDA Seepage Management Alternatives Method Characteristics Sustainability Pumping wells • Appropriate in gravel to silty fine sand soils. • Unrestricted depths using submersible pumps. • Costs are relatively moderate. Slurry wall • Appropriate in silts, sands, gravels and cobbles. • Depths generally limited to 40 to 60 m, depending on soil and site conditions. • Requires relief wells upgradient of slurry wall. • Costs are relatively high for deep cut-off walls. Clay liners • Requires large volumes of clay. • Requires substantial site preparation, detailed quality control, and protection against dry/wet and freeze/thaw cycles. • Requires installation of horizontal drains in ETDA to alleviate ETDA pore pressure. • Cost is relatively high, and can be even more costly if clay source not close to the ETDA site. Synthetic liners • Requires intense site preparation, detailed quality control. • Requires installation of horizontal drains in ETDA to alleviate ETDA pore pressure. • Cost is relatively high. • Temporary measure. • Affects groundwater flows while in operation. • Once pumps are decommissioned, the groundwater levels and flow directions will recover. • Permanent and passive measure. • Permanently affects groundwater levels and flow directions. • Permanent and passive measure. • Does not affect underlying groundwater flows, as seepage is contained above natural surface. • Permanent and passive measure. • Does not affect the underlying groundwater flows as seepage is contained above natural surface. Performance Efficiency • High efficiency in permeable soils (gravel to silty fine sand) as it creates a cone of depression that works as a hydraulic barrier. • High efficiency in containing seepage as it provides low permeability barriers as a result of bentonite or clay slurry. • High efficiency in containing seepage when constructed properly and protected. • High efficiency in containing seepage when properly installed and protected. • Resistant to variety of chemicals. Section 12.1 Operational Maintenance • High. Requires monitoring of drawdown and pumping rates, systematic adjustment of pumping rates, monitoring of well efficiency and cleanup, pump replacement and well replacement. • No maintenance for slurry wall and relief well system. • No maintenance once covered by tailings. • No maintenance once covered by tailings. Request 17b Shell describes details that demonstrate a high confidence in the likelihood of successful mitigation of ETDA seepage water, anticipated seepage rates, and other aspects. The predicted seepage rate from the Pierre River Mine ETDA during operations was 240 L/s (Response 271b). i. How was this rate determined? 12-6 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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MINING AND PROCESSING ERCB SIRS 3 -
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AIR ERCB SIRS 40 - 45 Request 41b B
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WATER ERCB SIRS 46 - 79 Section 7.1
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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 SEWG The abbreviation for
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