Supporting Technical Assessments

> > > > > > > > UP UP UP UP 1.5% SLOPE 1.5% SLOPE HEAVY VEHICLE WASHBAY SEDIMENTATION PIT SLOPE 1.5% SLOPE 1.5% SLOPE > > SHELTER STORES WASH BAY > > > > > > > > CW CW > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > MINE ACCESS ROAD This Drawing must not be used for Construction unless signed as Approved Date Check Drafting Date Drawn Revision No A1 Rev: Drawing No: Original Size Title Project Check Designer Drafted Scale Design Note: * indicates signatures on original issue of drawing or last revision of drawing Approved Checked Appvd. Cad File No: 27 May 2022 - 3:03 PM P:\221\2210835\CAD\C3D\Design_WKP Mine\Production Drawings\2210835-CD-1506.dwg Plotted By: Hamish Kerr PRC No.: PTR No.: TIN No.: Date issued.: Date issued.: Issued at.: Sheet No. Drawings as an instrument of service are the property of OceanaGold, and, as such, must not be reproduce or copied in part or in full without permission. All drawing are to be return when no longer in use. BECA DWG No: 2210835-CD-1506 WAIHI NORTH PROJECT INFRASTRUCTURE GENERAL ARRANGEMENT ROCK STACK AND MINE ACCESS FACILITIES WAI-981-000-DWG-CI-1506 B BKH HEK JvZ - 1:1000 @ A1 A FOR INFORMATION BKH HEK JvZ 06.04.22 B FOR INFORMATION: UPDATED PROJECT NAME RTS HEK EG 26.05.22 2210835 Engineer: P. GLOWREY ROCK STACK (DRAINAGE DESIGN BY OTHERS) FOR INFORMATION NOT FOR CONSTRUCTION PROPERTY BOUNDARY. SURFACE FACILITIES AREA 2210835-CA-1111 WETLAND (SURVEYED) Meters 0 60 120 1506 WETLAND 20m OFFSET (NOTE 10m REQUIREMENT) MAIN COLLECTION POND (TO WATER TREATMENT PLANT) WILLOWS PORTAL ROCK STACK COLLECTION POND FOR LOWER ROCK STACK AND SEEPAGE WATER 600DIA CONCRETE PIPE NETWORK FROM LOWER ROCK STACK POND TO COLLECTION POND. REFER NOTE 2 EMERGENCY SPILLWAY MATAURA STREAM CLEAN WATER DIVERSION BUND JOIN LINE - REFER SHEET 2210835-CD-1505 2% MAJOR CONTOUR MINOR CONTOUR MAJOR CONTOUR MINOR CONTOUR DESIGN LEGEND > > EXISTING SERVICES NOTES 1. REFER TO GEOTECHNICAL ENGINEER DESIGN DRAWINGS FOR PROPOSED CLEAN WATER AND DIRTY WATER DIVERSION DETAILS 2. SIZING OF PROPOSED GRAVITY PIPE NETWORK CONNECTION BETWEEN ROCK STACK COLLECTION PONDS SUBJECT TO CONFIRMATION OF SEEPAGE FLOWS AND STAGED ROCK STACK DRAINAGE AREA 3. SIZING OF CONTACT POND EMERGENCY SPILLWAY SUBJECT TO CONFIRMATION OF 100-YR DESIGN FLOW. 4. REFER TO SHEET 2210835-CD-1510 FOR TYPICAL DRAINAGE CROSS-SECTION DETAILS 5. REFER TO SHEET 2210835-CD-1515 FOR TYPICAL DRAINAGE DETAILS 6. CLEAN WATER DIVERSION DRAINS ARE INDICATIVE ONLY AND WILL BE INSTALLED ALONG CONTOUR LINES WHERE PRACTICAL. 7. INLET AND OUTLET PROTECTION TO BE PROVIDED AT CULVERTS WHERE SCOUR RISK IS PRESENT. RIP RAP IS INDICATIVE ONLY, WITH APRON AND BOULDER SIZING TO BE CONFIRMED. 8. FISH PASSAGE THROUGH PROPOSED CULVERTS TO BE CONFIRMED BY OTHERS. ROCK STACK CONTACT WATER PIPELINE > RISER WITH BUBBLE UP OUTLET. DETAILS TO BE CONFIRMED REFER TO GOLDER CHANNEL CHARACTERISTIC REFERENCE PLAN FOR PROPOSED ROCK STACK DRAINAGE LAYOUT RIP RAP / EROSION PROTECTION CW POLYETHYLENE PIPE LAYDOWN AREA CLEAN WATER DIVERSION / CHANNEL. REFER NOTE 6 AND 7 PROPOSED SWALE (GRASSED). REFER NOTE 7 ROCK STACK CONTACT WATER CHANNEL. TYPICALLY ROCK LINED N CW-C6A NEW CULVERT UNDER ACCESS TRACK. SIZE TBC NEW CULVERT UNDER MINE ACCESS ROAD. SIZE TBC

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