Approval 14/5/19

National Offshore Petroleum Safety and Environmental Management Authority 1 of 2Acceptance decisionWA-523-P drilling exploration and appraisal environment planThis document provides notification of NOPSEMA’s decision made under regulation 10 of the OffshorePetroleum and Greenhouse Gas Storage (Environment) Regulations 2009 (Environment Regulations) toaccept an environment plan.Submission informationTitleholder1: Carnarvon Petroleum LtdEnvironment plan: WA-523-P drilling exploration and appraisal, BUF-ENV-PLN-0001, Revision 2Petroleumtitle(s)/Applicationnumber(s):WA-523-PDate first submittedto NOPSEMA:28/11/2018Activities type(s)2:  DrillingActivity overview:As described in theaccepted environmentplan.Carnarvon Petroleum Ltd. (CVN) has an active exploration focus onAustralia’s North Western Shelf (NWS), Western Australia (WA). Holding over35,000 km2 of exploration acreage, including the 2009 awarded Phoenixblocks (WA-435-P, WA-436-P, WA-437-P and WA-438-P), which contain thePhoenix South, Roc and Dorado discoveries.CVN intend to undertake drilling of one exploration well (Buffalo East-1) andup to two appraisal wells Buffalo East 2 and 3) in the Buffalo field inAustralian waters, directly adjacent to the Joint Petroleum DevelopmentArea (JDPA). The wells will be drilled within permit area WA-523-P,approximately 560 km northwest of Darwin. Drilling is planned to becompleted by end Q4 2021.CVN are the titleholder of permit area WA-523-P and will be the operator forthe proposed activity.Decision: AcceptedDecision date: 14/05/2019Decision made by: Representative of NOPSEMA: Environment Manager - Drilling & DevelopmentsDecision notificationAcceptance decision Decision notificationNational Offshore Petroleum Safety and Environmental Management Authority 2 of 2Basis of decisionNOPSEMA has assessed the environment plan in accordance with its assessment policies and procedures.Having regard to all information provided by, and referred to in the environment plan, NOPSEMA isreasonably satisfied that the environment plan meets the criteria set out in regulation 10A of theEnvironment Regulations.Next steps for the petroleum activityAn environment plan summary must be provided to NOPSEMA within 10 days of this acceptance.regulation 11(4) requires that this document provide material from the accepted environment plan.Once the summary document has been prepared to NOPSEMA satisfaction it will be published onNOPSEMA’s website. NOPSEMA aims to have all environment plan summary documents published within20 days of acceptance. This timeframe may vary should the document require amendment by thetitleholder.The titleholder is required to notify NOPSEMA 10 days prior to the commencement of the activity. Thisnotification will be published on NOPSEMA’s website.Titleholder environmental performance requirementsA titleholder is required to undertake a petroleum activity in accordance with the accepted environmentplan. It is an offence under the Environment Regulations to act in a manner contrary to the acceptedenvironment plan. A titleholder must submit a revision to the environment plan in response to a new orincreased environmental impact or risk, or a significant modification or stage of the activity not providedfor in the accepted environment plan.How to get further informationIf you have any further questions regarding the activity it is suggested you contact the titleholder’snominated liaison person for the activity.If you would like to access any further information regarding this decision, or would like to contactNOPSEMA please email [email protected] A titleholder includes an applicant for a petroleum access authority, petroleum special prospecting authority,pipeline licence, greenhouse gas search authority or greenhouse gas special authority under sub-regulation 9(2).2 Activity type as listed in the Offshore Petroleum and Greenhouse Gas Storage (Regulatory Levies) Regulations 2004