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Tungatinah Conservation Management Plan 2018

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Tungatinah Conservation Management Plan 2018 Tungatinah Power Station Conservation Management Plan Review Final Report prepared for Hydro Tasmania AT0221 17 January 2018 EXECUTIVE SUMMARY This report has been prepared for Hydro Tasmania by Austral Tasmania Pty Ltd and is an updated and revised version of the Tungatinah Power Station Conservation Management Plan (CMP) 2007. Since the completion of the original report a number of changes have taken place to the fabric of the place, including a modernisation project involving the replacement or refurbishment of turbines and valves. This updated report is necessary to document these changes, document several new site locations and assess the role of the original conservation management plan (CMP) in shaping cultural heritage management outcomes. In addition to numerous minor changes that have taken place, the principal changes that have occurred include: Modifications to the exterior of the Power Station, with a roof access ladder and new signage installed. Refurbishment of the valves and upgrade of the interior of the Valve House. The replacement or refurbishment of Turbines 1, 2 and 5 as well as modifications to the Main Bay of the Power Station and the modernisation of the control system. The transformation of the Gasket Room, Gasket Room Store and associated hall way to an office and locker room. The 2007 CMP covered the power station, penstocks and valve house. This 2017 version of the CMP has been expanded to include the headworks, tunnel, as well as sites the picnic area and the remains of the concrete batching plant adjacent to the Power Station. The switchyard was excluded from the previous and current investigations, as it is not owned or operated by Hydro Tasmania. Generally the management of cultural heritage at the Tungatinah Power Station, and the external sites included in this CMP, have been undertaken in accordance with the policies of the 2007 CMP and Hydro Tasmania’s own heritage management framework. Sympathetic and considered implementation of necessary changes has been the norm rather than the exception and this is indicative of the broad success of both heritage management frameworks. However, in some instances issues have arisen because of the lack of prior preparation of Heritage Impact Assessments and the absence of a site specific movable/redundant heritage policy. The CMP has been effective in conjunction with broader Hydro Tasmania policies in protecting the heritage significance of a site which is also a functioning power station. Where Heritage Impact Assessments have been completed prior to the undertaking of works they have been effective in managing and mitigating harm to the heritage values of the site. Nevertheless, possibilities for improvement still remain and this review has identified three key points relating to the effectiveness of the CMP and its implementation: Incomplete coverage by the Heritage Impact Assessment process. Lack of a site specific movable/redundant heritage strategy. The retention of only the suite of features associated with Turbine 3 as the sole representative of the original configuration of the turbine system. These issues are addressed in the updated conservation policies presented in Section 5 and Section 6 of this report. The key activities that should take place within 12 months of the final conservation management plan being submitted should be: • Endorse this conservation management plan as the guiding document for future management and conservation of the place. • Although not included on the Tasmanian Heritage Register, as a place of State level significance, it would be desirable for copies of this document to be lodged with Heritage Tasmania. It would also be desirable for TasNetworks to be provided with a copy of this CMP to assist with management of the adjacent switchyards. • Ensure that the policies in this CMP are known and understood by relevant Hydro Tasmania staff, the relevant planning authorities and any contractors or others engaged to undertake any works at the site. It is imperative that this document is circulated to all management staff on site or associated with the day to day operation of the site. Responsibility for notification of AT0221: Tungatinah Power Station Conservation Management Plan Review i 17 January 2018 proposals that may result in a heritage impact rests with the Upper Derwent Area Production Manager. • The strategy for assessing and dealing with movable and/or redundant heritage items recommended in the original 2007 CMP has now become an urgent matter with some significant elements of the site having been lost or destroyed. It is critical that a strategy for dealing with movable/or redundant heritage items is developed as a priority. AT0221: Tungatinah Power Station Conservation Management Plan Review ii 17 January 2018 TABLE OF CONTENTS EXECUTIVE SUMMARY ................................................................................................... I TABLE OF CONTENTS .................................................................................................... III 1.0 INTRODUCTION ......................................................................................................... 1 1.1 BACKGROUND ......................................................................................................................................... 1 1.2 HERITAGE LISTINGS ............................................................................................................................... 1 1.3 HYDRO TASMANIA HERITAGE MANAGEMENT PROCEDURE ..................................................................... 1 1.4 OBJECTIVES ............................................................................................................................................ 1 1.5 STUDY AREA .......................................................................................................................................... 2 1.6 AUTHORSHIP ......................................................................................................................................... 2 1.7 LIMITATIONS AND CONSTRAINTS ............................................................................................................ 2 1.8 ACKNOWLEDGMENTS ............................................................................................................................. 2 2.0 ILLUSTRATED HISTORICAL BACKGROUND ............................................................ 6 2.1 ABBREVIATIONS USED IN THE HISTORICAL BACKGROUND ..................................................................... 6 2.2 BACKGROUND ....................................................................................................................................... 6 2.3 DESIGN & CONSTRUCTION ..................................................................................................................... 6 2.3.1 Valve House ................................................................................................................................. 11 2.3.2 Penstocks ..................................................................................................................................... 11 2.3.3 Power Station ............................................................................................................................. 12 2.4 OPERATION .......................................................................................................................................... 18 2.4.1 Power Station .............................................................................................................................. 21 2.4.2 Penstocks .................................................................................................................................... 22 2.4.3 Headworks ................................................................................................................................. 25 3.0 PHYSICAL DESCRIPTION - DATA SHEETS ............................................................. 28 3.1 INTRODUCTION .................................................................................................................................... 28 3.2 TUNGATINAH POWER STATION – EXTERNAL: INCLUDING WIDER SYSTEM ELEMENTS ......................... 29 3.2.1 Portal, Surge Tank & Valve House ........................................................................................... 30 3.2.2 Ruins & Relics in Vicinity of the Valve House & Penstocks .................................................... 32 3.2.3 Hillside Penstocks ...................................................................................................................... 34 3.2.4 Cooling Water Tank & Weir ..................................................................................................... 36 3.2.5 Power Station - Exterior ........................................................................................................... 38 3.3 POWER STATION—INTERNAL SPACES & ELEMENTS ............................................................................. 40 3.3.1 Common Internal Features/Materials .................................................................................... 40 3.3.2 Ground Floor ............................................................................................................................. 43 3.3.2.1 Foyer – S1 ................................................................................................................................ 43 3.3.2.2 Former Ladies Retiring
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