EGL Ref: 8983 23 June 2022 Page 39 WAI-985-000-REP-LC-0004_Rev0.docx This report shall only be read in its entirety. 16.0 DAM SAFETY MANAGEMENT 16.1. General Water and tailings storage dams constitute a potential danger to people, property and environment located downstream. A dam safety management system is required to ensure the dam is maintained in a safe condition to protect life, property and the environment downstream, and to avoid severe economic loss or loss of facility to the public. The NZDSG (Ref.4) provides guidance for developing appropriate dam safety management systems. A dam safety management program should ensure that: • The dam is operated with safe procedures; • A routine preventative maintenance program is in place; • Effective surveillance and inspection procedures are followed; • All responsible people are kept informed of the status of the dam through an effective reporting system; • Any incidents are managed with proper procedures and a clear plan • Responsibilities for all aspects of the dam safety program are clearly defined; • A validation or review system exists to check that all aspects of the program are effective; and • All personnel involved in the program are properly trained in dam safety procedures. The existing Operations, Maintenance and Surveillance (OMS) Manual for Storage 1A and 2 (Ref. 6) will be updated to include Storage 3 and be consistent with the NZDSG and Global Industry Standards on Tailings Management (GISTM - Ref. 23). It will include surveillance requirements for the dam as well as guidance on management of surveillance records, presentation of data, performance evaluation, and reporting. The most important activities in the dam surveillance program are frequent and regular inspections for abnormalities or deterioration in conditions and the recording, collection, analysis and evaluation of monitoring data. Existing resource consents for Storage 1A and Storage 2 require a Tailings Storage Facility Monitoring Plan (TSFMP). The TSFMP covers monitoring for structural integrity (dam safety) as well as monitoring for groundwater and environmental effects. The structural integrity monitoring in the TSFMP duplicates the monitoring elements included in the OMS Manual. An important element of a dam safety management programme is regular dam safety reviews. The regular reviews outlined in Section 2.4 for the existing TSFs will include Storage 3 in future. The annual inspection report, (prepared by EGL as mentioned in Section 2.3), will also be undertaken for Storage 3 and reviewed by the PRP. The overall responsibility for dam safety management lies with OGNZL. All personnel involved in dam safety are required to be trained and be familiar with dam safety procedures. The Building (Dam Safety) Regulations 2022 will take effect from 13 May 2024. They are concerned with the safety of existing dams. They will require dam owners to submit a PIC assessment for all large dams to the Regional Authority. The PIC assessment must be certified by a Recognised Engineer. If they classify as Medium or High they
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