PMR Remediation Project Action Plan

8/8/2019 PMR Remediation Project Action Plan

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01 November 2001

of the

Action Plan Feasibility Studyfor a

BRITANNIA MINE REMEDIATION PROJECT

Government of British ColumbiaMinistry of Water, Land and Air Protection


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November 23, 2001

Mr. J.W. McCrackenRegional DirectorGovernment of British ColumbiaMinistry of Water, Land and Air Protection10470 152 StreetSurrey BC V3R 0Y3

Dear Jim:

RE: ACTION PLAN for a FEASIBILITY STUDY of theBRITANNIA MINE REMEDIATION PROJECT

The attached Action Plan was developed by 33 representatives of MWLAP, MELP, MEM, SLRD,Environment Canada, Fraser Basin Council, B.C. Museum of Mining, UBC, Golder Associates, SRKConsulting, URS, CH2M Hill, Klohn Crippen, and Water Management Consultants during a two-dayfacilitated ESP (Enhanced Systematic Planning) Session held in the offices of AMEC Simons Mining& Metals in Vancouver BC on November 1 st and 2 nd , 2001.

The document describes the development of MWLAPs plan for remediation of the Britannia Minesite, including a detailed feasibility study for a water treatment plant and an associated watermanagement system.

The Feasibility Master Schedule included in this Action Plan has 135 work packages distributed oversixteen work areas. It is a high-level schedule with a solid project perspective, suitable foradministration of the program. It intentionally does not include the level of information that will benecessary to manage the details of the Feasibility Study or the associated programs.

It is expected that this Action Plan will prove to be a valuable baseline document to guide theexecution of the Feasibility Study and the overall advancement of the Britannia Mine RemediationProject.

Distribution: Planners: Gerry O Hara, Ray Robb, Peggy Evans, David Sellars, Peter Healey, Daryl Hockley, Tom Field, Jim Mavis,

D Whiti St Sibbi k


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ACTION PLAN for a FEASIBILITY STUDYof theBRITANNIA MINE REMEDIATION PROJECTGovernment of B.C. Ministry of Water, Land and Air Protection

SUMMARY

INTRODUCTION

The attached Action Plan was developed by 33 representatives of MWLAP, MELP, MEM,SLRD, Environment Canada, Fraser Basin Council, B.C. Museum of Mining, UBC, GolderAssociates, SRK Consulting, URS, CH2M Hill Canada Limited, Klohn Crippen, and WaterManagement Consultants during a 2-day interactive ESP (Enhanced Systematic Planning)Session held in AMECs offices in Vancouver on November 1 st and 2 nd , 2001.

The planning session was facilitated and documented by AMEC Simons Mining & Metals.

NAME OF PROJECT

The name of the project is the Britannia Mine Remediation Project .

OBJECTIVE OF PROJECT

MWLAPs representatives, with the participation and endorsement from the other provincialand federal representatives identified the objective of the project as an intent ... to developand implement a project that:

will reduce environmental impacts on fisheries (including other aquatic organisms, the

fish habitat, and sediment and water quality) resulting from water and sedimentsoriginating from the mine site, by meeting site-specific risk-based provincial and federalrequirements.

will construct a water treatment plant and other works to treat drainages to meet site-specific provincial and federal requirements.

will reduce contamination-related human health risks on, and emanating from, themine site by meeting site-specific risk-based provincial requirements.

will consider future sustainable development, compatible with land use designations inSLRDs official community plan.


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SUMMARY

PLANNING TEAM

The Action Plan defined in this document was developed by the 33 planning sessionparticipants identified below. The full planning team functioned on an interactive,participative basis, without stringent regard for their government or corporate alignments,although these affiliations are identified below. These same planners also wrote the scopedescriptions in Section 2 of this document; there, their initials identify the authors of eachwork package.

Business cards for the participants are included in this report commencing on Page 1-08.

Planners Initials Areas of Contribution MWLAP

Gerry OHara GCOH Geol Eng; Mine Ops; HydroGeol; RemediationRay Robb RHR Chem/Enviro; Prov OversightPeggy Evans PLE HydroGeol; Contam Sites; Tech Advisor; Waste Mgt

WMC

David Sellars CDS Civil; Water Resources; Flood Mgt; Flood HazardSRK

Peter Healey PMH Civil; Proj Mgt; Mine Reclamation Projects; HydroGeolDaryl Hockley DEH Civil/Chem; Mine Closures; ARD

CH2MTom Field TF Hydrology; PM Infra Projects; Planning & ImplementationJim Mavis JDM Phys Chem; Mine Remediation; Water Treatment Chem; Ops

URS

Doug Whiticar DMW Enviro Eng; Remedial; WWT; HydroGeolSteve Sibbick SJS Geochem; Fieldwork; Proj Mgt

AMEC Terry Lee TDL Facilitator

Sponsor Initials Areas of Contribution MWLAP

Jim McCracken JWMcC Civil; Water Mgt; Regional Water; MWLAP Owners Rep


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SUMMARY

Observers Initials Areas of Contribution MWLAP

Doug Pope DTP Civil/Enviro; Prov RegsTechnical Advisory Committee

Walter Kuit WJK WTP Process; Chem R&DRob McCandless RGM Geol; Mine Ops; Fed Regs (Fisheries Act)Gregg Stewart GGS Geol; MEM Regulator; Mine Permitting; Mines ActBarry Azevedo BDA Chem/Enviro; Tech Support; Prov Regs

Steering CommitteeTed Hall TJH Civil; MEM; Mines Act PermittingMike Nassichuk MDN Biol; EnviroCanada; Marine Sediments

MEMChris Carr CAC Geotech; MEM; Permitting Tech Support

SLRDSteve Olmstead SDO SLRD Planning; Land Use Planning & RegsPam Tattersfield PST Chem; Fisheries; BB Resident

UBC

John Meech JAM Mine Eng; 2200L Plug;Tech ResourceFraser Basin Council

Bob Purdy BP Corp Dev, Fraser Basin Council; NGO; Proj FacilitatorMining Museum

Terry Johnson TWJ Mine Eng; Britannia Mine Ops; BC Mining MuseumYale Simpson YRS Geol Eng; Mine Museum Planning; LT Site Planning

Golder Associates

Reidar Zapf-Gilje RZGRoss Hammett RDH Mine Geotech & HydroGeol SupportJim McCrea JLM Mineral Process; Proj Mgt SupportRick Peleshytyk RRP Enviro Eng; PM SupportDon Chorley DWC Contam Sites; Closure Plans; HydroGeol Tech Supp

Klohn Crippen

Graham Parkinson JGP Geo Science; Mine Enviro; Water Mgt; Plug GeotechCH2M Hill

Tom Robinson STR Civil/Enviro; Proj Mgt; Civil & Process Design

Note: Two representatives of Copper Beach Estates were invited to participate in this planningi b t ith Al T k i Ti D d i tt d


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SUMMARY

WORK BREAKDOWN STRUCTURE (WBS)

The Britannia Mine Remediation Project has numerous administrative and asset themes thatwill be developed during the feasibility study phase; and designed, procured andconstructed during the implementation phase of the project. These themes, or Work Areas,were defined by the planning team prior to the start of the active planning session; they formthe primary structure of the plan:

A Project AdministrationB Mine Inspection And RehabC HydrologyD Flood RiskE Mine Water CollectionF Mine Water StorageG Water QualityH Water Treatment PlantJ Sludge ManagementK Fan HydrogeologyL Contaminated SoilsM Risk AssessmentN Remediation PlansP SedimentsQ ComplianceR Site Wide Monitoring

OUTSTANDING ISSUES

Several outstanding issues, with potential impact on the feasibility study and/or theimplementation of the project, were identified during the course of the two-day planningsession:

Potential impact of winter on study schedule Accessibility (road maintenance) through winter period


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SUMMARY

SCHEDULE CALENDAR

The ESP Master Schedule in this document was prepared using the Primavera softwarepackage. It was based on the precedence [logic] network developed during the planningsession, and used a start date of November 5th, 2001.

The schedule uses one-day time units, with five days per calendar week. No allowanceswere provided for statutory holidays or vacation periods, apart from a one-week impact overthe Christmas period.

SCHEDULE RESULTS

During the ESP Session, the 33-member planning team identified 135 key work packagesand established the logic relationships that integrated the evolution of the feasibility study.They also estimated the duration of each work package.

The as-developed schedule forecast a completion date for the Draft WTP Feasibility Report(Work Package H-25) of December 9 th, 2002. AMECs Facilitator subsequently made anumber of carefully rationalized adjustments to the schedule, and improved the issue date ofthe draft report by almost two months, to October 18 th.

The schedule included in this document has been modified slightly by AMECs Facilitator toimprove the duration of the program. The changes were faithful to the intent of the planningteam, and are a normal part of the planning process.

These ten adjustments were made to the original schedule:

ADJUSTMENTITEM WP or RELATIONSHIPFrom To

1 F-08 20 152 F-09 75 703 F-09/F-11 FS FF 10 4 F-09/K-08 FS FF 10 5 G-07/G-08 FS FF 12 6 H-22/H-24 FS FF 20


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SUMMARY

SCHEDULE FORMATS

The Feasibility Master Schedule for the Britannia Mine Remediation Project is presented inthis report in three different formats:

A 5-page tabulation of the work packages which describes the early start and finishdates, the late start and finish dates, the duration, and the total float for each activity; it isincluded on Pages 3-02 to 3-06 of this report.

A 7-page detailed bar chart, in color, of all work packages sorted by project areas. It is asimple and clear presentation of all of the work packages, sorted in the usual early start-early finish fashion; it can be found following Page 3-06.

A large Time-Scaled Logic Diagram of all work packages, grouped by Work Area. Thisformat is similar to the bar charts above, but the logic links have been included. Theschedule was created in landscape format, and can be found in the plastic pocket at theback of this report.

In addition, a 1-page Project Overview Schedule is included in this Action Plan. It can befound following Page 1-06 in the Summary.


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SUMMARY

BUSINESS CARDS (Page 1 of 5)

For the convenience of Planners and others using this Action Plan, the business cards forthe attendees are included on these five pages.

Water, Landand Air Protection

Regional Operations

Lower Mainland

Region

J.W. (Jim) McCrackenRegional Director

Location and Maining Address:10470 - 152 StreetSurrey BC V 3R 0Y3

Telephone: (604) 582-5265Facsimile: (604) 582-5380e-mail:[email protected]

Mailing Address:2080B Labieux RoadNanaimo, BC V9T 6J9

Telephone: (250) 751-7375(604) 660-9363

Facsimile: (250) 751-7373Cellular: (250) 741-7856e-mail: [email protected]

Ministry ofEnergy and Mines

Mailing Address:10470 - 152 StreetSurrey BC V3R 0Y3

Telephone: (604) 582-5284Facsimile: (604) 584-9751e-mail: [email protected]

Ministry ofEnvironment,

Lands and Parks



Ministry ofEnvironment,

Lands and Parks



Ministry of

Environment,Lands and Parks

Mailing Address:10470 - 152 StreetSurrey BC V 3R 0Y3

Telephone: (250) 356-8386

Facsimile: (250) 387-9935e-mail: [email protected]

Location:2975 Jutland Road, Victoria

Ministry of

Environment,Lands and Parks


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SUMMARY



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Fax (416) 982 [email protected]

500 - 4260 Still Creek DriveBurnaby, British ColumbiaCanada V5C 6C6Tel: (Ma in) (604) 296-4200

(Direct) (604) 296-4216(Cell) (604) 728-7940

Fax: (604) 298-5253E-mail: go'hara@gold er.com

0


500 - 4260 Still Creek DriveBurnaby, British ColumbiaCanada V5C 6C6

Tel: (60 4) 298-66 23Fax: (604) 298-5253


500 - 4260 Still Creek DriveBurnab y, British Col umb ia

Canada V5C 6C6Tel: (Ma in) (604) 296-4200(Direct) (604) 296-4281(Cell) (604) 617-6623

Fax: (604) 298-5253E-mail: rzapf-gilje@g older.com

0


500 - 4260 Still Creek Drive

Burna by, British Columb iaCanada V5C 6C6Tel: (Ma in) (604) 296-4200

(Direct) (604) 296-4235Fax: (604) 298-5253E-mail: rpeleshytyk@gold er.com


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SUMMARY



Peter M. Healey P.Eng.

Suite 800, 580 H ornby StreetVancouver, BCCanada V6C 3B6

[email protected]

Phone: +1.604.681.4196Direct: +1.604.601.8420Fax: +1.604.687.5532Home: +1.604.985.6751

Daryl Hockley M.Eng., P.Eng.

Suite 800, 580 Hornby StreetVancouver, BCCanada V6C 3B6

[email protected]

Phone: +1.604.681.4196Direct: +1.604.601.8427Fax: +1.604.687.5532

T. (Tom) Field, P.Eng., M.Eng., FEICVice President

CH2M HILL Canada Limited920 - 475 W. Georgia StreetVancouver, British Columbia V6B 4M9Tel 604.684.3282 Ext. 304Fax 604.684.3292Cell [email protected]

James D. Mavis, Jr.

CH2M HILL777 108th Avenue, NESuite 800Bellevue, WA 98004-5118P.O. Box 91500Bellevue, WA 98009-2050Tel 425.453.5000Direct 425.453.5005 Ext. 5116Fax 425.468.3100E-Mail [email protected]

S. Thomas Robinson, P.Eng.Senior Project Engineer

CH2M HILL Canada Limited920 - 475 W. Georgia StreetVancouver, British Columbia V6B 4M9Tel 604.646.2766 Ext. 312Fax 604.684.3292

Cell [email protected]

Dougla s M. Whit ica r, P.Eng., CEA Steve Sib bick , M.Sc., P.Geo.


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SUMMARY



P a m Ta t t e r s f i e l d

SQUAMISH-LILLOOET REGIONAL DISTRICT

[email protected]

S t e v e n O l m s t e a d , MCIP

SQUAMISH-LILLOOET REGIONAL DISTRICT

[email protected]

J ohn A. Meech, P.Eng. Professor of Mineral Processing

Department of M ining andMineral Process EngineeringRoom 517, 6350 Stores RoadVancouver, B.C. Canada V6T 1Z4

Bob Purdy Director, Corporate Development

Fraser Basin Council


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SUMMARY



G r a h a m Pa r k i n s o n P.Geo.Senior Geophysicist

(604) 279 4405(604) 279 [email protected]

10200 Shellbridge WayRichmond, B.C., CanadaV6X 2W7

Wa l t e r J . K u i tDirector, Environmental Affairs

Te c k C o m i n c o M e t a l s L t d .

500 - 200 Burrard Street, Vancouver, BC Canada V6C 3L7telephone: (604) 685-3011 facsimile: (604) 685-3019

email: [email protected]

111 Dunsmuir StreetSuite 400Vancouver, British ColumbiaCanada V6B 5W3

TD (Terry) LeeConsultantFacilitated PlanningProject ManagementAMEC Simons Mining & Metals

www.amec.com


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SCOPE DESCRIPTION

The scope description of each work package on the following pages is brief, but it highlightsthe essential content and context of the work for each activity. The key persons whoattended the planning session also wrote the scope descriptions for the individual workpackages. For convenience, the initials of each Planner have been placed adjacent to thescope descriptions, which he or she prepared; note that the initials are not intended to imply

a responsibility for execution of the work package.

* * * * *

A PROJECT ADMINISTRATION

A-01 Mobilize Project Website (GCO'H)

A collaborative website will be developed by Golder to assist in communicationsamong members of the project team. The website will include data posting,scheduling, messages, tasks, contact lists and links to other relevant sites. Thepossibility of inclusion of a database functionality will also be reviewed.

A-02 Establish Expenditure Guidelines (GCO'H)

Expenditure Guidelines will be established to provide the technical contractors with

information regarding the type and level of expenditures that are considered tohave been pre-approved in the technical contracts. These guidelines will alsodefine the procedures to be followed in obtaining approval from the Province forother expenditures. The guidelines will be coordinated with Activity A-06.

A-03 Develop Health and Safety Plans (GCO'H)

A general Health & Safety protocol will be developed to comply with the Mines Act

and define the procedures for obtaining access to the site. Each technicalcontractor will develop its own Health & Safety Plan to, as a minimum, comply withthe contractors health & safety procedures, WCB requirements and, whereappropriate, specific requirements under the Mines Act and other relevantlegislation.


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SCOPE DESCRIPTION

A-04 Resolve Contracts (GCO'H)

The existing scope of work in the technical contracts will be compared to the scopeof work in the Action Plan. Differences between the initial scope, as contained inthe RFP and the contracts, and the scope in the Action Plan, will be identified anddiscussed with the technical contractors. A revised scope of work will bedeveloped with emphasis on the total contracted amount staying within the totalvalue of the technical contracts. Areas where there is some discretion in theAction Plan will be identified for discussion with the Province. Upon reaching aconsensus, the existing contracts will be modified to reflect the changes sinceaward of the contracts.

A-05 Develop Consultation Plan (GCO'H)

In order to achieve the required level of stakeholder input and buy-in to theremediation plans and their implementation, a Consultation Plan will be developedthat will identify stakeholder group(s), meeting forum(s), committee(s), and theirappropriate interface to the project management and coordination.

A-06 Develop Standing Offer Eligibility List (GCO'H)

Implementation of the Action Plan will require construction contractors to performservices that are outside the scope of services provided by the technicalcontractors. The development of a Standing Offer Eligibility List, and associatedcontracts, will enable the Province to have a listing of pre-approved contractorsand agreed upon pricing for construction activities. Development of this List will becoordinated with the Activity A-02.

A-07 Develop Economic Model (GCO'H)

An economic model will be developed to integrate and rationalize the capital andoperating costs. In particular, it will address the long-term operation andmaintenance of the remedial works, including the water treatment plant.Development of this model will influenceTasks A-09 and A-10.

A-08 Develop Project Execution Strategy (GCO'H)


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SCOPE DESCRIPTION

A-09 Develop WTP Operating Strategy (JLMcC)

The operating strategy will define means for funding of operating costs andreplacement capital costs for all facilities including the water treatment plant, watermanagement systems, facilities installed as a result of implementing theremediation plans and all related facilities.

A-10 Establish Operating Philosophy (JLMcC)

The operating philosophy will establish criteria to guide the design of the watertreatment plant and ancillary facilities by providing criteria for the trade-off betweencapital and operating costs, a project staffing philosophy, desired operating factorsfor the major components of the plant, operating reliability and other factors that

must be considered in the design of the water treatment plant and related facilities.

A-11 Acquire Land Rights (GCO'H)

Once the Province concurs with the recommendations of the technical consultantsregarding the location of the water treatment plant, water management systemsand other facilities, the Province will initiate a program to acquire the appropriateland rights, where they have not already been acquired. Acquisition of land rightswill be required prior the construction phase, and has been included in the designphase to ensure that construction work can proceed.


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SCOPE DESCRIPTION

B MINE INSPECTION and REHAB

B-01 Develop Mine Inspection Plan (PMH)

Based on a review of the available information, a detailed plan to carry outinspections of the mine workings and mine infrastructure (including openings atthe 3250, 3100, 2700 (both), 2200, 1200, and 1000 Levels; the site of the Victoriashafts; and adits on the Furry Creek side) will be prepared in accordance withMines Act Safety requirements and safe entry as needed for mine work. Theinspection will focus on openings that will effect flow and chemistry of the minewater to the 4100 tunnel. However, other openings will be inspected, if accessible,in the interest of long term public safety.

B-02 Approve Mine Inspection Program (PMH)

The Inspection Plan will be submitted to the B.C. Ministry of Mines for approval bythe chief inspector of Mines under the Mines Act and the Health, Safety andReclamation Code for Mines in British Columbia.

B-03 Execute Mine Inspection Program (PMH)

Once approval of the inspection plan has been received, the mine inspection willbe completed as per the approved inspection plan. Both underground and surfaceareas identified in the plan will be inspected. All inspections will be carried out by ageotechnical engineer and a specialist familiar with the design and construction ofrehabilitation measures. A certified shift boss will accompany the inspection teamfor underground work.

B-04 Develop Phase 1 Rehabilitation Plan (PMH)

On completion of the inspection, a detailed Phase I rehabilitation plan and costestimate will be prepared. The plan will consider only those items that pertain tothe pre-plug test investigation and the execution of the plug test. Rehabilitation willfocus on the 4100 and 4150 Level tunnels. A number of contractors will be shortlisted at this stage to avoid delay in awarding the work.


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SCOPE DESCRIPTION

B-06 Implement Phase 1 Mine Rehabilitation (PMH)

Once approval of the plan has been received, tender documents will be preparedand a quote will be solicited from selected contractors to complete the work.Following approval of the quote, the work will be awarded and a contract signedwith the successful contractor. The contractor will mobilize equipment to the siteand commence the work. Supervision of the rehabilitation will be provided byexperienced geotechnical and mining engineers.

B-07 Prepare Mine Rehabilitation Program (PMH)

A detailed rehabilitation plan for the remaining phases and a cost estimate will beprepared for work required to ascertain safety of the mine workings and mine

infrastructure as determined by the inspection. The plan will include the itemslisted in B-01 and the stability of waste dumps and existing timber culverts.

B-08 Approve Mine Rehabilitation Program (PMH)

The plan will be submitted to the B.C. Ministry of Mines for approval by the ChiefInspector of Mines under the Mines Act and the Health, Safety and ReclamationCode for Mines in British Columbia. Approval will also be sought from MWLAP.


Once approval of the plan has been received, the proposed work will be advertisedand tender documents will be prepared. The project team will assist in theselection of a rehabilitation contractor by preparing a detailed specification,recommending bidders (if required), recommending proposal evaluation criteria,and participating in the proposal evaluation. The rehabilitation will be carried outunder direct contract to MWLAP and the project team will assist in contractorselection and inspecting contractor progress. This phase of the work will focus onwork that can be carried out during the execution of the plug test.


The process will mirror B-09, however, the work will focus on rehabilitation that can


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SCOPE DESCRIPTION

C HYDROLOGY

C-01 Review Hydrology Data (PMH)

Consultants will review and evaluate the available hydrologic information for theBritannia Creek Basin, including creek and adit flows, climate records, and historichydroelectric generation data.

C-02 Upgrade Flow Monitors (PMH)

A detailed reconnaissance of the existing flow monitoring sites will be carried outduring a site reconnaissance of the Britannia Creek Basin, including Jane Basinand the Apex and Victoria Mines area. The sites will be assessed for remote data

access and security. A detailed plan, schedule and budget for remote data accessand security of existing monitoring stations and provision of additional monitoringstations will be prepared based on the results of the review of the historicalrecords. Following approval of the plan, upgrading of existing gauge stations andinstallation of new stations will be implemented.

C-03 Prepare Base Maps (PMH)

Digital base maps will be prepared of the Britannia Creek and Furry Creekdrainage basins including Jane Basin and the Apex and Victoria Mine areas tied tothe historic mine survey grid and the NAD 83 UTM coordinate system. Maps willhave a 10-metre contour interval. A more detailed 5-metre contour map will beprepared for the Jane Basin catchment.

C-04 Estimate Mine Inflows (PMH)

Peak mine inflows and return periods will be estimated from available historicalmine flows and meteorological records. The work will involve developing a seriesof annual hydrographs that represent the inflows to the mine workings duringextreme wet years.

C-05 Finalize Hydrology Report (PMH)


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SCOPE DESCRIPTION

D FLOOD RISK

D-01 Review Precipitation and Flow Data (CDS)

Precipitation and flow data will be collected and reviewed. Regional stations willprovide the long-term data, and site data will be used for correlation analysis. Aregional flood frequency analysis will be carried out to estimate the 200-year floodfor Britannia Creek. This will comprise flood frequency analyses using flowrecords for basins in the region and developing a relationship between watershedcharacteristics and flood peaks.

D-02 Calibrate Hydrologic Model (CDS)

For developing an estimate of the Probable Maximum Flood, an HEC-1 orequivalent watershed model will be developed of the basin. The model will use adesign precipitation hyetograph and generate a flood hydrograph. The model willbe calibrated using recorded events such as the August 1991 event. Verificationof the model will be based on a different flood event.

D-03 Execute Site Surveys (CDS)

A review of the watershed will be carried out to assess the influence ofdevelopment on the flood hydrology. The dams constructed for hydroelectricdevelopment will be inspected. The extent of logging and road construction in thewatershed will be assessed. Surveys of the reservoir areas behind the dams andtypical downstream cross sections will be conducted.

D-04 Assess Debris Flow (CDS)

The debris flow, debris torrent and debris flood assessment will be based on visualand air photo inspections of likely source and run out zones in the watershed. Ahelicopter reconnaissance will be conducted as part of this work. The downstreamrisk from debris flow events will be assessed.

D-05 Develop Sedimentation Analysis (CDS)


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SCOPE DESCRIPTION

D-06 Route Flood Flows (CDS)

Precipitation events of different return periods will be routed using the hydrologicmodel and a flood routing model, MIKE 11. The probable maximum precipitationwill be input to the model to produce the probable maximum flood design flood

hydrograph. An assessment of dam freeboard will be carried out using the floodrouting model. The output will be design flows and flood levels in the lower valley.

D-07 Execute Dam Breach Analysis (CDS)

The dam breach analysis will be carried out using the MIKE 11 model. Theexisting mapping of the town site area will be used to assess the potential impactsdownstream of a potential dam failure. The dam failure will be combined with a

flood event to simulate the likely simultaneous occurrence of both of these events.D-08 Execute Downstream Flood Assessment (CDS)

An assessment will be provided of the flood hazards to siting of the treatmentplant, the required floodproofing elevations and possible mitigating actions againstflooding. The options will be presented at a conceptual level. The results of theFlood Risk Assessment will be provided as a stand-alone appendix to the MineStudy and Hydrogeology Report.


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SCOPE DESCRIPTION

E MINE WATER COLLECTION

E-01 Review Water Quality Data (DEH)

Water quality data will be reviewed with the specific intent of identifying sourcesand/or sinks in the Jane Basin and 2200 Portal areas. Data collected byEnvironment Canada will be collated and reviewed.

E-02 Review 2200L and Jane Basin Flow Paths (DEH)

The Jane Basin and 2200 Portals will be inspected and surface flow patternsdelineated. Samples of water from the area will be taken and analyzed forsignature elements and isotopes. The amount and quality of water entering the

mine by each flow path will be estimated.

E-03 Assess Possible Diversions (PMH)

An assessment will be made of whether works within Jane Basin (such as surfacediversions, soil covers or recontouring) could reduce annual 4100 Level flowsenough to warrant their permitting and construction. If the study proves positive, awork plan and budget for this work will be prepared.

E-04 Review Structural Geology (PMH)

Using geological maps supplemented by air photographs and mapping, astructural model of the project area, including mine workings will be developed.The hydrogeological significance of the main tectonic features will be evaluated. Itis expected that the most significant concern will be whether there are structuresthat could allow uncontrolled discharges when the mine is used to store water.Targets for groundwater monitoring during the pump test will be identified.

E-05 Create Mine/Geology Model (PMH)

Available mine data will be identified and reviewed and, as appropriate tounderstand and interpret the hydrological regime of the mine, a 3D digital modelwill be prepared of the surface and underground mine workings. The model will


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SCOPE DESCRIPTION

E-06 Identify Mine Water Flow Paths (PMH)

Flow paths will be determined of all contributions to 4100 Level and 2200 Leveldrainage flows by considering groundwater; seasonal and storm events; inflows toJane Basin workings or other mine openings; and inflows to the 2200 Level from

Furry Creek, or the Victoria shafts.

E-07 Estimate Mine Water Flows (PMH)

Preliminary estimates of Water Treatment Plant feed flows from the mine will beprepared. The estimates will be based on results of the mine water inflow and flowpath studies. The data will be compiled with data collected from the plug test andresults incorporated into the overall water management plan (F-13).


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SCOPE DESCRIPTION

F MINE WATER STORAGE

F-01 Close 2200L Plug (GCO'H)

The 2200 Level plug is currently under construction. It is anticipated that the plugwill become operational in mid-December, 2001. The closure of the plug drainpipe will be coordinated with monitoring activities at the mine site, in particular inBritannia Creek and the 4100 Level.

F-02 Review Plug Construction Records (JGP)

Records relevant to the 4100 Level plug test will be reviewed to determine the as-built plug configuration and performance of the plug during subsequent pressure

testing. The review of records will also extend to relevant geology and miningrecords for the 4100 Level to 3250 Level zones that will be flooded. The recordsinclude documents held by CBEL, Environment Canada, Klohn Crippen and theB.C. Mines Branch. The review will include discussions with personnel involved inthe plug construction.

F-03 Develop 4100L Plug Test Plan (JGP)

A plan of works and procedures will be developed to encompass the safety,regulatory, geotechnical, operational and hydraulic modeling aspects involved indetermining the integrity of the plug and the amount of water storage availablebehind the plug. A preliminary part of the plan will be the outline of the methodsused in the investigation works necessary for the safety review of the geotechnicalcondition of the plug. This section of the plan will be submitted to the Mines Branchfor early approval of the drilling component of the safety review. A second, morecomprehensive plan will then be developed to cover the entire plug test withseparate protocols for the hydraulic testing, water sampling, emergency and

contingency procedures.

F-04 Approve 4100L Plug Safety Review (JGP)

Since any works in a mine require Mines Branch approval, the drilling andremediation works associated with the investigations into the geotechnical


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SCOPE DESCRIPTION

F-05 Execute 4100L Plug Safety Review (JGP)

The objective of the investigation will be to determine the quality of the rock masssurrounding the plug and the nature of the cement-rock contact. This will be doneby extracting six diamond cores from holes angled into the tunnel wall through the

front face of the plug. Permeability will be measured using packer testing; fracturefrequency will be estimated by the logging and plotting of core discontinuities. Corefrom the plug will be tested for concrete strength and for signs of deterioration.Holes will be grouted shut with high quality non-shrinking grout. Data from theinvestigation will be used in the engineering report on the stability of the plug,forming part of the plug test application.

F-06 Develop 4100L Test Release Plan (JGP)

Since the stored mine waters may carry significantly more metal loading than therun-of-mine water, contingency plans for the release of these waters will bedeveloped. They may involve staged releases when impact is lowest. The releaseplan will consider a release schedule minimizing impact on aquatic life (salmonruns) and will be co-ordinated with monitoring programs.

F-07 Install 4100L Plug Instruments (JGP)

Instrumentation needed for the plug test will include a 10 inch magnetic flow meterinstalled downstream of the existing gate valve and a remote controlled valvesuitable for throttling the mine water flows under expected pressures. In addition, aremote indicating pressure sensor will be included to monitor reservoir head.Seepage past the plug will be collected and routed to a small remote indicatingflow measuring station on the floor of the tunnel. A strain gauge type instrumentwill monitor deformation of the plug relative to the tunnel wall. Data from theseinstruments will be gathered in a data logger/controller and transmitted periodically

or on command by telephone modem.

F-08 Obtain 4100L Plug Test Approvals (JGP)

The comprehensive plug test plan and engineering report on the plug stability willbe submitted for Owners review and for approval by Mines Branch and other


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SCOPE DESCRIPTION

F-09 Execute 4100L Plug Test (JGP)

The plug test will consist of a co-ordinated filling of the reservoir and themonitoring or estimation of mine inflows/outflows, monitoring of any internal andexternal mine seepages and continual water quality monitoring of water samples at

the plug, in the creeks and at nearby boreholes. The primary data will consist ofsystematically-acquired pressures and flow rates during filling and draining.Additional information on inflows will be obtained from staged level balancing testswhich will develop mine inflow data relative to mine head. Seepage data will beused to evaluate measures required for the long term stability of the plug duringwater treatment plant operation. Since water inflow will be variable, the exactduration of the plug test is unknown. If natural inflow is too slow, diverting MineralCreek into the 2700 Level may be required to meet project schedules.

F-10 Finalize Hydrogeology Report (JGP)

A combined Mine Study and Hydrogeology Report will be prepared. The report willpresents results from the investigations of hydrology (C-01 to C-05), mine watercollection (E-01 to E-07), and mine water storage (F-01 to F-13).

F-11 Assess 4100L Plug Test (JGP)

By integrating measured inflows versus time, an overall mine storage volume willbe determined. Tracking the rate of rise versus time during periods of equivalentinflows will allow determination of the sectional area versus elevation of the mineworkings. Based on these two analyses, a volume elevation curve will beestablished for the mine. In addition to assessing the hydraulic capacity of themine, an evaluation will be made of the geotechnical performance of the plugunder pressure.

F-12 Finalize 4100L Plug Test Report (JGP)

The results of the plug test will be combined with the results of the hydrogeologyand mine geology to assess the suitability of the plug/reservoir system forregulating seasonal water flows. The final report will include recommendations forsafe operation of the reservoir including operational limits and procedures.

AC O A f AS S


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SCOPE DESCRIPTION

F-13 Develop Water Management Plan (DEH)

A feasibility level plan will be developed for management of water at the site. Theplan will consider and make recommendations for diversions of clean water,routing of mine water, collection of contaminated groundwater, and storage of

mine water and groundwater to equalize flows and water quality. Long termchanges in flows and/or water quality will be taken into consideration.Uncertainties that could lead to problems in the Water Treatment Plant will beidentified. Contingency measures will be developed.

ACTION PLAN f FEASIBILITY STUDY


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SCOPE DESCRIPTION

G WATER QUALITY

G-01 Establish Preliminary WTP Feed Quality (DEH)

Preliminary estimates of Water Treatment Plant feed quality will be prepared. The

estimates will be based on a detailed review of data from previous monitoring ofthe 4100 and 2200 Level outflows. Those data will be provided by EnvironmentCanada. Any available data from the fan groundwater studies will be taken intoconsideration.

G-02 Assess Mine Contaminant Sources (DEH)

Possible sources of copper and zinc in flows entering the mine will be identified

and investigated. Air photos will be examined first. Then a detailed ground levelreconnaissance will be completed in the Jane Basin and 2200 Level portal areas.The reconnaissance will include mapping of waste rock deposits and otherpossible sources, and sampling and analysis of surface flows.

G-03 Predict Mine Storage Effects (DEH)

An initial prediction will be developed of the chemical effects of storing water in themine. Data from the previous flooding tests will be reviewed and compared to datafrom experience at other sites (Baker, Holden). A limited sampling and testing ofreadily accessible mineralized rock will be completed to identify acid salts andother oxidation products, as well as possible solubility controlling phases. Athermodynamic model will be used to assess the possible effects of redoxchanges.

G-04 Assess Mine Routine Effects (DEH)

The effects or re-routing the 2200 Level flows through the mine will be assessed.Historical records and the mine model will used to identify possible flow paths, andto identify areas where the flow could contact mineralized and oxidized zones.Initial predictions of possible increases in contaminant loads will be prepared.Outflow at the 4100 Level plug will be monitored before and after the 2200 Levelplug is closed. The outflow monitoring results will be compared to the initial

ACTION PLAN for a FEASIBILITY STUDY


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SCOPE DESCRIPTION

G-06 Install Mine Water Quality Monitors (DEH)

The mine water quality monitoring system procured In Task G-05 will be installedand commissioned.

G-07 Monitor Mine Storage Effects (DEH)

The effects of storage on mine water quality will be monitored during the plug test.Samples and/or data will be collected from the monitoring system installed in TaskG-06, and samples will be taken from the 4100 Level plug discharge. Theresulting data will be analyzed to estimate average water quality and to identifytrends that could indicate deterioration or improvement of water quality over time.

G-08 Establish Feasibility WTP Water Feed Quality (DEH)Results from the assessments of mine water and fan groundwater quality will becombined to estimate ranges of Water Treatment Plant feed quality. Thepossibility of equalizing contaminant loads by mixing the two flows will beassessed. The possibility of long term changes in Water Treatment Plant feedquality will be estimated.



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SCOPE DESCRIPTION

H WATER TREATMENT PLANT

H-01 Develop Interim Improvement Opinion (JDM)

After a preliminary review of surface water flow paths across the site, streambed

amendments will be considered and recommended if site conditions support theiruse. The considerations will focus on copper concentration in surface water, sitetopography, types of amendments that might be used, and potential improvementsto surface water runoff that might reasonably be achieved. A brief summary reportwill be prepared describing expected improvements to surface water runoff fromthe site.

H-02 Assess Interim Improvement (JDM)

The summary report from Task H-01 will be reviewed by decision-makers and byother interested parties. Written comments and questions will be addressed. If acost estimate is needed to support decision-making, the site will be visited to verifysurface water streambed locations, construction access, and (potentially) toidentify actively weathering deposits that might be treated. The technical feasibilitywill be re-evaluated, a conceptual-level cost estimate will be prepared, andrecommendations will be re-assessed. Written and verbal questions will be fieldedand a meeting will be held to discuss the findings and clarify any outstandingissues. (Design criteria and performance goals will be established in a new andseparate task if implementation is to be pursued).

H-03 Review Existing Permit Criteria (JDM)

The existing discharge permit will be examined. Other agencies that have jurisdiction over or input into the establishment of discharge limits will be identifiedand contacted, and opinions will be obtained about desired and probable required

discharge water quality criteria. A table of potential discharge criteria will becompiled according to agency; it will be submitted to the Project Manager fordistribution to and comment from the various agencies.

H-04 Establish Discharge Objectives (JDM)



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SCOPE DESCRIPTION

H-05 Establish Preliminary WTP Feed Rate (TF)

Early estimates of the flow-equalized hydraulic feed rate from mine drainage willbe obtained from previous minewater investigations (by SRK) and an earlyestimate of required seasonal hydraulic pumping rates from site remediation

activities will be obtained from previous groundwater investigations (provided byURS). These data will be used to establish the preliminary feed flow rate for theWater Treatment Plant. The chemical composition of mine water and groundwaterwill also be obtained from previous studies.

H-06 Execute Lab Sulphide Assessment (JDM)

A sample of the existing acid rock drainage water will be collected from the siteand sent out for analysis and simulated treatment to achieve two objectives. Thefirst objective will be to test cadmium removal (to protect offshore aquatic life).The second objective will be to verify that copper sulphide (and zinc sulphide) canbe selectively precipitated and that the recovered by-product(s) will meet theacceptance criteria of smelter(s) that may buy the by-products.

H-07 Develop Preliminary WTP Design (TF)

The Water Treatment Plant design will be developed to the preliminary levelbased upon the discharge objectives, the preliminary Water Treatment Plant feedrate, and the sludge management concepts. Preliminary Water Treatment Plantprocess design will be based on the HDS process as outlined in the RFP. It willinclude an estimate of required hydraulic retention time, recycle ratio, andpreliminary sizing of major plant equipment, such as thickeners and sludge storagefacilities.

H-08 Develop Pilot Program (JDM)

The pilot program will be developed based on the preliminary Water TreatmentPlant process design. The pilot testing program will also draw on previous pilottesting of the HDS process at Britannia in 1997. The program will establish therequired retention time, recycle ratio, and determine the anticipated underflowdensity, sludge characteristics, optimal pH, lime consumption, and flocculant



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of theBRITANNIA MINE REMEDIATION PROJECTGovernment of B.C. Ministry of Water, Land and Air Protection

SCOPE DESCRIPTION

H-09 Execute Pilot Program (JDM)

The pilot plants will be shipped to the site, set up and commissioned prior to testexecution. The physical-chemical (primary) process will be tested first, without thepretreatment system in operation. While the primary process is undergoing this

initial period of testing, the pretreatment process will be started up, optimized, andstabilized. Feed to the primary process will revert to pretreated water after thepretreatment process has stabilized and the initial tests of primary process havebeen completed to establish baseline conditions. Follow up testing of eachprocess will be carried out until the essential test objectives have been achieved.After field tests are finished, data from the primary and pretreatment process testswill be analyzed.

H-10 Assess Sulphide Market (JDM)

Physical and chemical characteristics of the pretreatment sulphide by-products willbe provided to metal buyers at appropriate smelters to solicit their willingness totake the recovered sulphide concentrate. The smelter(s) response(s) will bedocumented and forwarded with recommendations to the Project Manager forreview and consideration by the Ministry and other Stakeholders. The Ministry willprovide direction on how to incorporate by-product recovery into the overall project.

H-11 Assess Preliminary PFS and Failure Mode (JDM)

A summary report will be written on results of pilot testing, including identificationof fulfilled and outstanding objectives. In addition, the initial process flowsheet onwhich pilot testing was based will be revisited to assess how well the pilot plantsperformed compared to initial expectations. Deviations from expectedperformance will be carefully documented and the process will be revised toaddress these departures. A qualitative failure mode analysis will be performed on

the main elements of the primary treatment and pretreatment processes. Thefailure mode analysis will consider the nature of failure, the consequences of thefailure, the severity of failure, preventive or corrective measures, and how thefailure would manifest itself or be detected. The report will cover all the foregoingaspects.



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SCOPE DESCRIPTION

H-13 Develop Conceptual Site Layout (TF)

A conceptual treatment plant site layout (i.e. footprint) will be developed based onthe discharge objectives, the preliminary feed rate, sludge management concepts,and the preliminary Water Treatment Plant design. It will be based on the

preliminary sizing of the larger process equipment, and will include sufficient spacefor plant ancillary facilities.

H-14 Hold Stakeholder Workshop (TF)

In order to develop a single set of siting criteria acceptable to all parties, astakeholder workshop will be held in Britannia to seek input from all affectedparties. The workshop will attempt to identify conflicting objectives quickly andresolve as many as possible. The objective for the meeting will be to develop thesiting criteria by identifying the musts, and establishing the basis for rating thewants concerning Water Treatment Plant siting and design. This will becomethe framework for the site selection analysis.

H-15 Identify Potential WTP Sites (TF)

A list of potentially-feasible sites for the Water Treatment Plant will be identifiedbased on the conceptual plant site layout (footprint). Information will be collectedthat will enable the potentially-feasible Water Treatment Plant sites to beevaluated and short listed. This information will include utility requirements,potential impacts on nearby residential and commercial areas, impacts ofincreased traffic and requirements for roadworks, architectural requirements, andorder-of-magnitude costs.

H-16 Develop Preliminary Plant Layout (TF)

A preliminary-level Water Treatment Plant layout will be developed, based on theselected site, the preliminary Water Treatment Plant process design, and the sizeof larger process equipment, such as the sludge thickener and the short-termsludge storage facilities. The equipment will be arranged in a plant layout that alsoincludes plant ancillary facilities, chemical delivery, sludge handling, employee andvisitor parking, etc.



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SCOPE DESCRIPTION

H-17 Select WTP Plant Site (TF)

A preliminary screening of potentially-feasible Water Treatment Plant plant siteswill be conducted using the must and want criteria developed at the Stakeholderworkshop. For the short-listed Water Treatment Plant sites, utility requirements,

potential impacts on nearby residential and commercial areas, impacts ofincreased traffic and requirements for roadworks, architectural requirements, andorder-of-magnitude costs will be estimated. Each of the short-listed sites will bescored against the evaluation criteria, and the ranking will be reviewed with theProject Manager.

H-18 Finalize Discharge Criteria (JDM)

With input from pilot testing, projections of future mine water and groundwaterquality and quantity, the Ministry, and requirements and preferences of affectedagencies and from stakeholders in general, the discharge objectives will berevised, if warranted, and redistributed for independent review. After review andcomment by affected parties, a meeting will be held to discuss any outstandingissues in order to arrive at a (proposed) set of finalized discharge criteria that canbe submitted for formal acceptance.

H-19 Establish WTP Design Criteria (JDM)

Other activities that are conducted in parallel with work on the Water TreatmentPlant will provide information about the nominal and maximum hydraulic flow ratesof mine water and groundwater that must be treated in the Water Treatment Plant .Related parallel work will supply the nominal and extreme concentrations ofconstituents expected in mine water and groundwater. Sludge disposal options,pilot plant test results (design data), discharge criteria, good engineering practices,and prior experience will be used in connection with mine and ground water

characteristics to establish preliminary design criteria for the Water TreatmentPlant . These preliminary criteria will be summarized and distributed for reviewand comment before being finalized in a brief design basis memorandum.

H-20 Finalize PFD (TF)



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SCOPE DESCRIPTION

H-21 Execute Site Investigations (TF)

Following approval of the selected site by the Project Manager and regulators,geotechnical site investigations will be executed to determine the foundationrequirements for the Water Treatment Plant . The investigation will include a

drilling program and a site survey. The program will deliver recommendations forfoundation types, acceptable bearing pressures, and an assessment of thepotential for seismically-induced liquifaction. This information will feed into thecapital cost estimates and the Water Treatment Plant feasibility report.

H-22 Develop WTP Infrastructure Design (TF)

Feasiblity-level design will be developed for infrastructure requirements for theselected site. The design will include utilities, feed water delivery pipelines,discharge pipelines, access for vehicles delivering reagents, access for vehicleshauling sludge, and access for plant workers and the public. An investigation willbe made of the potential need for improved intersection design to address trafficissues related to truck traffic entering from Highway 99. The SLRD will beconsulted to determine how to connect with community water and sewer lines, andfor recommendations on other planning and zoning issues.

H-23 Develop WTP Feasibility Design (TF)

Feasibility-level design will be developed to address the following Water TreatmentPlant issues: flexibility of Water Treatment Plant design capacity in relation tofuture flow changes; control of mine flows during plant shutdowns; location, size,and general appearance of the Water Treatment Plant; instrumentation and O&Mrequirements which affect the Water Treatment Plant feasibility; location, size andcapacity of supply and discharge pipelines; sources for, cost, and expected life ofkey plant equipment and components; sources of lime, on site handling and the

disposal of slaker grit; means of handling and management of HDS sludge; andchanges needed for highway access, zoning, and planning issues.

H-24 Estimate WTP Costs (TF)

Detailed feasibility-level capital and operating cost estimates will be developed for

ACTION PLAN for a FEASIBILITY STUDYf th


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SCOPE DESCRIPTION

H-25 Develop Draft WTP Report (TF)

A draft Water Treatment Plant Feasibility Report will be developed. It will addressadvance planning for provision of electrical and utilities services; evaluation ofcapital costs versus operating cost strategy tradeoffs; required staffing levels and

potential operation by museum staff; facility safety and security; and steps neededto secure approvals under the Mines Act, Waste Management Act, and others, ifnecessary.

H-26 Execute CEO Review (TDL)

A Capital Efficiency Optimization review of the project will be made to identifypotential cost opportunities and risks. The CEO review will be based on the DraftWater Treatment Plant Report for the project. The magnitude of the opportunitiesand risks will be estimated and evaluated using NPV engineering principles, and apath-forward will be developed for each item. The CEO review will promote adisciplined balance between the operating and capital costs, and will be a rationalbasis of a risk mitigation plan.

H-27 Review Draft WTP Report (TF)

Draft Water Treatment Plant Feasibility Report will be reviewed by Project

Manager and others as appropriate.

H-28 Issue WTP Feasibility Report (TF)

The review comments will be addressed, the report will be revised as necessary,and the final Water Treatment Plant Feasibility Report will be issued.

ACTION PLAN for a FEASIBILITY STUDYof the


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SCOPE DESCRIPTION

J SLUDGE MANAGEMENT

J-01 Develop Sludge Concepts (TF)

Earlier work will be reviewed, and screening-level concepts will be developed for

storage and management of HDS sludge on Britannia lands. The concepts mayinclude short-term storage at the Water Treatment Plant site, and longer-termstorage elsewhere on Britannia lands. These concepts will be further developedinto options after the completion of the pilot study.

J-02 Assess Sludge Quality and Quantity (JDM)

Pilot and laboratory test results and preliminary water quality projections will bereviewed to estimate the mass, volume, composition, and characteristics of sludgefrom the treatment process(es). The characteristics will be compiled in a brieftechnical memorandum and distributed for information and further evaluation.

J-03 Develop Sludge Options (TF)

The sludge management concepts (developed in J-01) will be developed furtherinto options for short, medium and long-term storage/management of sludge onBritannia lands or off-site as appropriate. The options may include short-termstorage at the Water Treatment Plant site, and longer-term storage elsewhere onBritannia lands or off-site. Development of these options will be in relation to thepreliminary Water Treatment Plant design performed in relation to preliminarysulphide by-product assessments under lab sulphide assessment (H-06),preliminary Water Treatment Plant design (H-07), and the results from pilot testing(H-09, H-10).

J-04 Evaluate Sludge Options (TF)

To gain broad-based acceptance of the objectives, evaluation criteria, evaluationprocess, and final selection of sludge management scheme, the Stakeholders willbe engaged early to identify musts and establish the basis for rating the wantsconcerning sludge management. This exercise will establish the framework for theselection analysis. It is expected that this will include, at a minimum, an analysis of



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SCOPE DESCRIPTION

K FAN HYDROGEOLOGY

K-01 Execute Historical Review (DMW)

A historical review of the Britannia Mine site will be conducted under the guidelines

of a CSR Stage I PSI (Preliminary Site Investigation). The goal of the historicalreview will be to identify potential compounds and areas of contamination that werecreated during the life of the mine. The review will include both the fan area andthe additional areas outside of the fan. Results of the review will be used todevelop work plans for the Fan DSI (Detailed Site Investigation) and the AdditionalAreas PSI.

K-02 Develop Surface Work Plan (DMW)

Using the findings of the Historical Review, the results of the Screening Level RiskAssessment and any other relevant information, work plans will be developed tofurther assess the contaminated sites and potentially contaminated sites potentialof the Britannia Mine area. Two work plans will be developed; a Detailed SiteInvestigation (DSI) for the fan area (including the adjacent intertidal zone), and aPreliminary Site Investigation (PSI) for areas outside of the fan (including theintertidal zone) suspected of contamination originating from the Britannia Mine site.

K-03 Install Fan Aquifer Test Wells (DMW)

Eleven groundwater monitoring wells will be installed at pre-determined locationson the Britannia fan. In addition, two groundwater extraction wells will be installedin the fan area west of Highway 99. Where possible, monitoring and extractionwells will be installed using the high frequency Vibra Sonic drilling method, whichwill enable the collection of continuous soil cores throughout the drilling profile.Continuous soil cores will be logged in the field by a geologist. Field logs will

include observations of soil texture, colour, moisture content, and the degree ofoxidation or staining, which will be useful in the interpretation of whether anysubsurface materials may comprise tailings or other mine waste materials.

K-04 Conduct Fan Baseline Aquifer Study (DMW)



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SCOPE DESCRIPTION

K-05 Execute Fan Pump Tests (DMW)

The extraction well(s) will be pumped at a maximum rate of 100 USgpm(545 m 3 /d). The pump test will be run for several hours, sufficient time to producemeasurable drawdowns in adjacent monitoring wells while generating a lower

volume of contaminated water that would need to be either re-injected or disposedof in the mine. Approval will be sought from BCMWLAP for the disposal of thepump test water. In addition, slug tests will be performed in up to ten monitoringwells to supplement the information gained through the pumping tests. Similarmethods for filtering tidal signals as those used for the pumping tests will beapplied to slug test data to ensure that tidal interference is minimised.

K-06 Develop Fan Groundwater Model (DMW)

The data obtained from the hydrogeological assessment will be used for fluxcalculations, and to assess the pumping rates required to achieve the control andcontainment of contaminant plumes, based on a predictive numerical model(MODFLOW/MODPATH) that will be calibrated to the pump test data. Thenumerical model will also be used in the evaluation of alternative remedialstrategies for the site (e.g., pump and treat with barriers, pump and treat with re-injection). The model will also be used to simulate plume behaviour with seasonallyvariable pumping rates.

K-07 Monitor Fan Test Wells (DMW)

Prior to the start of the 4100 Level plug test, continuous groundwater elevationmeasurement will be initiated in monitoring wells across the fan area usingpressure transducers. Monitoring will continue for the duration of the plug test.The transducer data will be downloaded weekly. Groundwater quality monitoringmay also be used to quantify impacts from the plug test and will be utilized in theFan Area DSI. Near-bottom water samples will be obtained from the fan areaforeshore, to infer the degree to which groundwater seepage is impacting theintertidal zone of the foreshore.

K-08 Assess Impact of 4100L Plug Test (DMW)



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BRITANNIA MINE REMEDIATION PROJECTGovernment of B.C. Ministry of Water, Land and Air Protection

SCOPE DESCRIPTION

K-09 Execute Additional Areas (AA) PSI (DMW)

Following the work plan developed for the Additional Areas PSI, fieldwork will beconducted to investigate and collect samples from terrestrial and intertidal sites inthe additional areas suspected of being contaminated. The goal of the Additional

Areas PSI is to identify contaminated sites locations that will require a detailedinvestigation for remediation under the CSR.

K-10 Develop DSI Work Plan (DMW)

Using the results of the Additional Areas PSI, a work plan will be created to carryout a detailed site investigation in the Additional Areas. Detailed site investigationsgenerally involve a more in-depth characterization of contamination at a site thatwill lead to the development of remediation techniques to remove or mitigate thesource of contamination.

K-11 Execute Additional Area Water Tests (DMW)

As part of the Additional Areas DSI, porewater and surface water suspected ofcontamination will be sampled and tested. The work will provide data for theidentification and remediation of any suspected contaminant sources. Theprogram may involve the installation of piezometers in selected location across the

site for groundwater sampling, and the sampling and analysis of surface streamsand seepages.



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SCOPE DESCRIPTION

L CONTAMINATED SOILS

L-01 Sample Britannia Creek (DMW)

As part of the Fan Area DSI, stream sediment and water samples will be collected

from the streambed of Britannia Creek and analysed for metals. Analytical resultswill be used to determine the present day metal concentrations in the creek, and topotentially identify any groundwater sources in the fan that may be contributingmetals load to the creek. These results will be incorporated into the fan area riskassessments.

L-02 Sample Fan Surficial Soils (DMW)

A screening surficial soil sampling program will be completed in the fan area. Thiswill consist of the collection of approximately 500 shallow soil samples fromrandomly stratified coordinates within a grid consisting of 20 x 20 m cells. Thegoal of the survey will be to identify metal contaminated hot-spots and to clarifywhich parts of the near-surface fan may be source areas for metallic contaminants.The hot-spots will be re-evaluated by a step-out test pit program.

L-03 Execute Fan Test Pit Program (DMW)

A test pit program will be used to further define the extent of hot-spots identifiedthrough the surficial screening program, and through any relevant informationfound during the historical review. A backhoe will be used to excavate, in locationsacceptable to stakeholders, up to 25 test pits in the fan area. Samples will beanalysed for metals, acid-base accounting parameters, hydrocarbons and/or otherparameters as necessary. Intertidal sediments and tailings will be sampled, ifdetermined to be necessary in the planning stage, to provide data in support of riskassessment.

L-04 Prepare Fan DSI Report (DMW)

A Detailed Sites Investigation (DSI) report will be prepared containing the results ofthe investigations carried out in the Fan Area. A draft DSI report, in a formatconsistent with MWLAP CSR requirements, will be prepared and submitted for



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SCOPE DESCRIPTION

L-05 Sample Additional Areas Soils and Waste Rock (DMW)

As part of the Additional Areas DSI, soils and waste rock will be collected andanalysed. The sites will be identified during the Additional Areas PSI, but will likelyfocus on the Mt. Shear/2200 Level portal area. Soils analysis may include totalmetals, leachable metals and/or hydrocarbons. Waste rock samples will becollected from waste dumps and analysed for acid-base accounting parametersplus total and leachable metals. Drilling and test pitting may be utilized tounderstand the extent and variability of contamination.

L-06 Execute Additional Areas Test Pit Program (DMW)

A test pit program will be used to further define the extent of potentialcontamination identified in the Additional Areas PSI. A backhoe will be used toexcavate, in locations acceptable to stakeholders, up to 25 test pits in theadditional areas, likely to be focussed on the Mt. Shear/2200 Level portal area.Samples will be analysed for metals, acid-base accounting parameters,hydrocarbons and/or other parameters as necessary.

L-07 Prepare Additional Areas DSI Report (DMW)

A Detailed Sites Investigation (DSI) report will be prepared containing the results of

the investigations carried out in the additional areas. This will include the results ofinvestigations carried out both in the uplands and marine areas, as required. Adraft DSI report, in a format consistent with MWLAP CSR requirements, will beprepared and submitted for review. Following the review process, a final DSIreport will be prepared and submitted to MWLAP.



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SCOPE DESCRIPTION

M RISK ASSESSMENT

M-01 Execute Risk Screening Assessment (DMW)

The Screening Level Risk Assessment screens representative concentrations of

contaminants found in soil, groundwater and intertidal sediment media againstappropriate standards and guidelines. The result of this effort will be a descriptionof the contaminants that present the potential for risk to humans and ecologicalreceptors, as well as an understanding of the magnitude by which these PCOCsexceed relevant standards and guidelines. This information will be used to helpdesign a more focused and cost-effective Fan Area DSI and Additional Areas PSI.Information on subtidal sediment contamination will also be reviewed to allow forintegration with the Sediment Geophysical Survey (P-01) and Marine SedimentDSI (P-07) carried out by others.

M-02 Execute Fan Ecological Risk Assessment (DMW)

A Tier 1 risk assessment will be conducted using the B.C. Tier 1 Guidelines forEcological Risk Assessment (ERA) and appropriate USEPA guidance documents.The intertidal sediments will be included in this assessment. The risk assessmentwill also provide an indication of risk inherent to both on-site and off-site aquaticlife from exposure to contaminated surface waters or groundwater, and the degree

of control/capture or treatment required to mitigate these risks.

M-03 Execute Fan Human Health Risk Assessment (DMW)

A Tier 1 Human Health Risk Assessment will be conducted using the B.C. Phase 1Guidelines for Human Health Risk Assessment (HHRA), for the fan area asoutlined above. Intertidal sediments will be included in this assessment.

M-04 Develop Subtidal Sediment Risk Assessment (DMW)Ecological Risk Assessments will be carried out on subtidal marine sediments byothers.

(Although integral to the overall remedial work associated with the Britannia Mine

ACTION PLAN for a FEASIBILITY STUDYof theBRITANNIA MINE REMEDIATION PROJECT


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SCOPE DESCRIPTION

M-06 Execute Additional Areas Human Health Risk Assessment (DMW)

Human Health Risk Assessments will be carried out on the terrestrial componentsof the Additional Areas. The risk assessment will be conducted using the B.C.Tier 1 Guidelines for Human Health Risk Assessment. Upcoming guidance onconducting risk assessments for mine sites may be applied if available.



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SCOPE DESCRIPTION

N REMEDIATION PLANS

N-01 Develop Fan Remediation Plan (DMW)

A Remediation Plan will be developed for the fan area consistent with the definition

provided in CSR Section 1, including a summary of areas and contaminants ofconcern, evaluating various remedial options that may be applicable from atechnical and cost perspective, an evaluation of the applicability and effects of theremediation on regulatory aspects, and a proposed monitoring program.

N-02 Develop Additional Areas Remediation Plan (DMW)

A remediation plan will be developed for upland and intertidal Additional Areasbased on information gathered in previous phases of work. The plan will addressthe requirements of the Waste Management Act and Contaminated SitesRegulation. Remediation options will be quantified and assessed for suitabilitybased on practicality, cost, integration with plans from the mine watermanagement and treatment projects, long-term performance, regulatory and socialacceptability, future land use, and other criteria considered relevant in consultationwith BCMWLAP and their representatives. Options will be compared andassessed based on conceptual designs.



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SCOPE DESCRIPTION

P SEDIMENTS

P-01 Execute Sediment Geophysical Surveys (RGM)

The distribution of subtidal mine tailings within a depth of thirty metres will be

mapped by others. It is anticipated that this program will include micro-seismicand sidescan sonar arrays with the signals integrated in a GIS platform alreadydeveloped for existing seabed imaging. Cores will be collected during thegeophysical survey to confirm interpretations of sediment character and allowestimation of sedimentation rates using isotope dating techniques.

(Although integral to the overall remedial work associated with the Britannia MineRemediation Project, this work package will be undertaken outside the Provincesscope of work. It is included here to indicate interaction and relationship withremedial activities included in the Provinces scope of work).

P-02 Assess Sediments Effects (DMW)

The potential risks posed by tailings and sediments in the intertidal zone will beevaluated on the basis of a literature review. Findings from the screening level riskassessment (M-01) will be incorporated. The potential risks posed by tailings andsediments in the subtidal zone will be evaluated (by others) on the basis of a

literature review.

Others will assess potential risks posed by tailings and sediments in the subtidalzone and available results from this work will be integrated into the AdditionalAreas risk assessment, M-05. (Although integral to the overall remedial workassociated with the Britannia Mine Remediation Project, this component of thiswork package will be undertaken outside the Provinces scope of work. It isincluded here to indicate interaction and relationship with remedial activitiesincluded in the Provinces scope of work).



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SCOPE DESCRIPTION

P-03 Execute Sediment Biological Surveys (RGM)

A subtidal benthic invertebrate community survey will be designed by others. It isanticipated that this will form part of the subtidal DSI (P-07) and will use existingdata on sediment chemistry and seabed imaging to select locations for replicatesediment grab samples. Taxonomic identification and numeration of thesecollections together with control samples from an uncontaminated or control sitewill assess the health of the benthic community, and provide samples for sedimentand porewater chemistry, particle sizing, and toxicity using laboratory invertebratetest species.

(Although integral to the overall remedial work associated with the Britannia MineRemediation Project, this work package will be undertaken outside the Provincesscope of work. It is included here to indicate interaction and relationship with

remedial activities included in the Provinces scope of work).

P-04 Review Existing Subtidal Information (DMW)

Information available on physical and chemical fate and behaviour of subtidalsediments will be evaluated by others. Information considered in this review willinclude data on studies completed to date (by others) and from the screening levelrisk assessment.

(Although integral to the overall remedial work associated with the Britannia MineRemediation Project, this work package will be undertaken outside the Provincesscope of work. It is included here to indicate interaction and relationship withremedial activities included in the Provinces scope of work).

P-05 Identify Gaps in Subtidal Information (DMW)

Available information pertinent to the risk evaluation of subtidal sediments will becompiled and evaluated for data gaps by others. Deficiencies will be identified andresolution incorporated into the Subtidal DSI Work Plan. The full extent of the Off-Site Waterbodies DSI will be determined (by others) following review of theupcoming DOE sediment data and the Screening Level Risk Assessment forAdditional Areas.



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SCOPE DESCRIPTION

P-06 Develop Subtidal Work Plan (GCOH)

Environment Canada (EC) and Department of Fisheries and Oceans (DFO) are jointly developing a work plan for investigation of the subtidal sediments (aworkshop was conducted on September 21, 2001). This work plan will include M-04, P-01, P-02 (part), P-03, P-04, P-05, P-07 (part), P-08 and P-09. The work planwill be consolidated into a Statement of Work (SOW) for selecting and hiring acontractor to perform the work. The plan will encompass benthic communitysurveys, bioassays and sediment chemistry. The focus will be on the near-shoreareas with the purpose of providing information for the subsequent aquatic riskassessment and sediment management plan.

P-07 Execute Marine Sediments DSI (DMW)

Execution of the subtidal DSI (scope to be determined), will be undertaken byothers.

(Although integral to the overall remedial work associated with the Britannia MineRemediation Project, this component of this work package will be undertakenoutside the Provinces scope of work. It is included here to indicate interaction andrelationship with remedial activities included in the Provinces scope of work).

The Fan Area/Additional Areas intertidal sediments investigation is expected torequire collection of 30 surface sediments and 5 one metre deep subsurfacecores. Surficial samples (0 ~ 10 cm) will be collected using a full sized Ponar grab.Deep cores will be collected using a gravity corer or vibracorer at predeterminedintervals. Surficial and subsurface sediments will be leach tested for their potentialto release metals. If necessary, toxicity testing of surficial sediments at 8 stationsbe conducted on areas demonstrating more severe metal contamination (fromDOE data review) using the marine amphipod Eohaustorius estuarius andpolychaete Neanthese arenaceodenta , with chronic lethal/sublethal(growth/reburial) test-endpoints for both organisms. For comparison, toxicitytesting will also be performed on sediments from two non-mine-impacted referenceareas in Howe Sound. Benthic macroinvertebrate surveys (density and diversity)may be included as a tertiary line of evidence for the Tier 1 ERA, if determined tobe necessary.



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Government of B.C. Ministry of Water, Land and Air Protection

SCOPE DESCRIPTION

P-08 Develop Subtidal Sediments DSI Report (DMW)

A Subtidal Sediments DSI report will be prepared (by others).

(Although integral to the overall remedial work associated with the Britannia MineRemediation Project, this component of this work package will be undertakenoutside the Provinces scope of work. It is included here to indicate interaction andrelationship with remedial activities included in the Provinces scope of work).

The Additional Areas (intertidal) sediments investigation report will be submittedwith the remediation plan for the Additional Areas. This report will meet therequirements of the Waste Management Act and Contaminated Sites Regulation.

P-09 Develop Sediment Management Plan (DMW)

A sediment management plan will be developed for the intertidal sediments in amanner consistent with CSR requirements for a remediation plan, incorporatingthe available findings of the subtidal sediment DSI and Risk Assessment phases ofwork. Options and costs for management of subtidal sediments will beconsidered.

A sediment management plan will be developed for the subtidal sediments by

others.(Although integral to the overall remedial work associated with the Britannia MineRemediation Project, this component of this work package will be undertakenoutside the Provinces scope of work. It is included here to indicate interaction andrelationship with remedial activities included in the Provinces scope of work).


Documents

PMR Remediation Project Action Plan