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 > > > > > > > > > > > > > > UP UP UP 3 DS DS DS CT LA LA LA STAIRS SA SA SA NER > > > > > > // // // // // // // > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > // // > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > E E E E E OH OH OH OH OH OH OH OH OH OH OH OH PP PP PP PP WILLOWS ROAD MAGAZINE ACCESS ROAD TOPSOIL STOCKPILE AREA > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > JOIN LINE - REFER SHEET 2210835-CD-1506 WETLAND (SURVEYED) SURFACE FACILITIES AREA 2210835-CA-1111 OVERLAND FLOW PATH EFFLUENT DISPOSAL FIELD VEGETATION ZONE PRIVATELY OWNED RESIDENCES. OGNZL OWNED RESIDENCE. GATE NOISE BUND. DRY DETENTION POND. REFER DETAIL C FOR SERVICE OUTLET DETAIL PRIVATE VEHICLE CAR PARK NOISE BUNDS EMERGENCY SPILLWAY OVERLAND FLOW PATH DISCHARGES TO NATURAL GROUND FORM STORMWATER SWALE. OUTLETS TO RETENTION POND RIP-RAP SWALE TO CAPTURE CAR PARK RUN OFF RIP RAP ARMOURING ON FILL EMBANKMENT FOR SCOUR PROTECTION SW-C3A MIN 1200DIA CULVERT STORMWATER SWALE. OUTLETS TO DETENTION POND SW-C4B MIN 1200 CULVERT SW-C4A MIN 1200DIA CULVERT EXISTING CULVERT TO BE UPGRADED. SW-C2A MIN 1500DIA CULVERT RIP-RAP AT DRAIN OUTLET TO EXISTING WETLANDS WETLAND 20m OFFSET (NOTE 10m REQUIREMENT) EXISTING FARM TRACK TO BE SEALED. EXISTING FLOW PATHS TO BE MAINTAINED CW-C3A CW-C3C CW-C3D CW-C3B 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 - 3:02 PM P:\221\2210835\CAD\C3D\Design_WKP Mine\Production Drawings\2210835-CD-1505.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-1505 WAIHI NORTH PROJECT INFRASTRUCTURE GENERAL ARRANGEMENT SFA AREA WAI-981-000-DWG-CI-1505 B BKH HEK JvZ - 1:1000 @ A1 A FOR INFORMATION BKH JvZ 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 Meters 0 60 120 1505 OVERLAND FLOW PATH DISCHARGES AT EXISTING DRAIN RIP-RAP SCOUR PROTECTION ON EMBANKMENT 2% CLEAN WATER DIVERSION / CHANNEL. REFER NOTE 6 AND 7 MAJOR CONTOUR MINOR CONTOUR MAJOR CONTOUR MINOR CONTOUR DESIGN PROPOSED SWALE (GRASSED). REFER NOTE 7 LEGEND > > > > EXISTING SERVICES ROCK STACK CONTACT WATER CHANNEL. TYPICALLY ROCK LINED NOTES 1. IT IS ASSUMED THAT FACILITIES WHICH ARE CONSIDERED TO BE HIGHER PRODUCERS OF POTENTIAL CONTAMINANTS WILL HAVE SPECIFIC INTERVENTION AND TREATMENT METHODS IN PLACE. 2. PROPOSED SERVICE OUTLET AT SFA DETENTION POND TO RELEASE 2-YR AND 10-YR FLOWS AT PRE-DEVELOPMENT RATES. EMERGENCY SPILLWAY TO CONVEY 100-YR FLOW WITH 300mm FREEBOARD 3. DETENTION POND EMERGENCY SPILLWAY IS INDICATIVE. 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 > > RIP RAP / EROSION PROTECTION CW N MATAURA STREAM

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