Supporting Technical Assessments

FLOW DEPTH VARIES. MIN FREEBOARD 300mm 1 4 VARIES (1mTYP) A - TYPICAL DIRTY WATER CHANNEL SECTION SCALE 1:25 @ A1 VARIES 2m MINIMUM 550 MINIMUM 300 ORIGINAL GROUND FLOW EXISTING VEGETATION TO REMAIN UNDISTURBED SPECIFIC DESIGN CROSS SECTION COMPACTED EARTH BUND HYDROSEEDED AND MULCHED OR TOP SOILED AND SEEDED B - TYPICAL CLEAN WATER DIVERSION BUND SECTION SCALE 1:25 @ A1 C - SFA DETENTION POND SPILLWAY AND OUTLET SECTION SCALE 1:50 @ A1 SCRUFFY DOME MANHOLE RISER OUTLET PIPE 0.30 TOP OF BUND EMERGENCY SPILLWAY 1 3 1 3 2210835-CD-1510 WAIHI NORTH PROJECT STORMWATER TYPICAL SECTIONS WAI-981-000-DWG-CI-1510 B BKH KW - AS SHOWN 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 FOR INFORMATION NOT FOR CONSTRUCTION 1510 100-YEAR FLOOD LEVEL EMERGENCY SPILLWAY LEVEL 10-YEAR VOLUME 2-YEAR VOLUME WQ VOLUME TO MATAURA STREAM 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-1510.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: NOTES 1. WHERE CHANNEL SLOPE EXCEEDS 5%, EROSION PROTECTION WILL BE INSTALLED. NOTES 1. WHERE CHANNEL SLOPE EXCEEDS 5%, EROSION PROTECTION WILL BE INSTALLED.

RkJQdWJsaXNoZXIy MjE2NDg3