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Annual Broadscale Monitoring Report for the Tasman Peninsula and Norfolk Bay

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Annual Broadscale Monitoring Report for the Tasman Peninsula and Norfolk Bay Annual Broadscale Monitoring Report for the Tasman Peninsula and Norfolk Bay Marine Farming Development Plan Area for the period June 2017 to May 2018 July 2018 AQUENAL www.aquenal.com.au Aquenal Pty Ltd Tasman Annual Broadscale Monitoring Report July 2018 Document Control and Distribution Document Date Name Company Version Copies Type 31/7/2018 Matt Barrenger Tassal Electronic 1.0 1 1/8/2018 Mark Churchill EPA Electronic 1.0 1 COPYRIGHT: The concepts and information contained in this document are the property of Aquenal Pty Ltd. Use or copying of this document in whole or in part without the written permission of Aquenal Pty Ltd constitutes an infringement of copyright. DISCLAIMER: This report has been prepared on behalf of and for the exclusive use of Aquenal Pty Ltd’s client and is subject to and issued in connection with the provisions of the agreement between Aquenal Pty Ltd and its Client. Aquenal Pty Ltd accepts no liability or responsibility whatsoever for or in respect of any use of or reliance upon this report by any third party. 2 Aquenal Pty Ltd Tasman Annual Broadscale Monitoring Report July 2018 Table of Contents 1. Operational Summary .................................................................................................................................... 5 2. Introduction ................................................................................................................................................... 6 3. Methods ......................................................................................................................................................... 7 3.1. Site details and chronology of monitoring programs ............................................................................. 7 3.2. Sediment sampling ................................................................................................................................ 10 3.2.1. Benthic infauna .............................................................................................................................. 10 3.2.2. Visual assessment, redox potential and sulphide concentration .................................................. 10 3.2.3. Stable Isotope and particle size analysis ....................................................................................... 11 3.3. Water Quality ........................................................................................................................................ 12 3.3.1. Physico-chemical parameters ........................................................................................................ 12 3.3.2. Nutrient determination ................................................................................................................. 12 3.3.3. Phytoplankton analysis .................................................................................................................. 13 3.4. Investigation Trigger Limits ................................................................................................................... 16 3.5 Quality Assurance and Quality Control .................................................................................................. 17 3.5.1 Duplicate samples ........................................................................................................................... 17 3.5.2 Trip/Field blanks.............................................................................................................................. 17 4. Results and Interpretation ........................................................................................................................... 18 4.1. Sediment ............................................................................................................................................... 18 4.1.1. Visual Assessment .......................................................................................................................... 18 4.1.2. Redox Potential and Sulphide Concentration ................................................................................ 18 4.1.3. Particle Size Analysis ...................................................................................................................... 18 4.1.4. Stable Isotope Analysis .................................................................................................................. 19 4.2. Water Quality: Physico-chemical measurements ................................................................................. 31 4.2.1. Temperature .................................................................................................................................. 31 4.2.2. Salinity ............................................................................................................................................ 32 4.2.3. Dissolved Oxygen ........................................................................................................................... 32 3 Aquenal Pty Ltd Tasman Annual Broadscale Monitoring Report July 2018 4.3. Water Quality: Nutrients ...................................................................................................................... 41 4.3.1. Ammonia ........................................................................................................................................ 41 4.3.2. Nitrate ............................................................................................................................................ 41 4.3.3. Total Nitrogen ................................................................................................................................ 42 4.3.4. Phosphate ...................................................................................................................................... 42 4.3.5. Total Phosphorus ........................................................................................................................... 43 4.3.6. Silicate ............................................................................................................................................ 43 4.4. Water Quality: Phytoplankton .............................................................................................................. 56 4.4.1. Chlorophyll a .................................................................................................................................. 56 4.4.2. Phytoplankton abundance ............................................................................................................. 59 4.4.3. Harmful phytoplankton species ..................................................................................................... 59 4.5. Indicative Trigger Limits ........................................................................................................................ 64 4.6. Quality Assurance and Quality Control ................................................................................................. 66 5. References ................................................................................................................................................... 69 6. Appendices ................................................................................................................................................... 70 4 Aquenal Pty Ltd Tasman Annual Broadscale Monitoring Report July 2018 1. Operational Summary Reporting Period: June 2017 to May 2018. Licence name and location: Marine Farming Licences 055, 190, 193, 194 (Tasman Peninsula and Norfolk Bay MFDP) Lease holder: Tassal Group Ltd Organisation Conducting Environmental Assessment: Aquenal Pty Ltd ABN 86 081 689 910 244 Summerleas Rd Kingston Tasmania 7050 Phone 03 6229 2334 Fax 6229 2335 e-mail: [email protected] Details of Equipment Used for Sampling: • Yeo-Kal YK-611 water quality analyser (DO concentration and saturation, temperature, salinity) • Niskin bottle (bottom nutrient samples) • Pole sampler (surface nutrient samples) • 14 m length of flexible clear plastic tubing (phytoplankton) • Van Veen grab (benthic infauna) • Craib corer (redox, stable isotopes, particle size and sulphide samples) • WTW pH 320/set-1 meter with Mettler Toledo P14805-DXK-S8/225 combination redox probe (redox analysis) • WTW pH 320/set-1 meter with uniPROBE Sulphide Ion selective Electrode Connector probe (sulphide analysis) • Garmin/Omnistar™ GPS system (site location) Vessel: Katelysia - 6.7 m aluminium twin hull Aquenal survey vessel Laboratories: Laboratory Address Analytes Aquenal Pty Ltd 244 Summerleas Rd Sediments: Benthic infauna, redox, Kingston, TAS 7050 sulphide, particle size Water: DO, salinity, temperature, DO saturation Analytical Services New Town Laboratory Water: TN, TP, Phytoplankton cell counts, Tasmania 18 St Johns Avenue, New Town, chlorophyll a, and abundance/diversity TAS 7008 Environmental PO Box 1492 Macquarie Centre C:N, stable isotopes Isotopes Pty Ltd NSW 2113 Australia 5 Aquenal Pty Ltd Tasman Annual Broadscale Monitoring Report July 2018 2. Introduction As part of marine farming licence conditions for leases MF55 (Long Bay Port Arthur), MF190 (Creeses Mistake), MF193 (Badger Cove) and MF194 (Billy Blue), broad scale environmental monitoring must be undertaken (Figure 1). A broad scale environmental monitoring program (BEMP) has been developed for assessing water and sediment quality at a number of sites within the Tasman Peninsula and Norfolk Bay Marine Farming Development Plan (MFDP)
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