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Technical Modelling Report BIOMASS AND CHEMOTHERAPEUTANT TECHNICAL MODELLING REPORT BALTA ISLE CAR/ L/ 1003872 Author: Report date: 17 May 2017 Cooke Aquaculture Scotland Crowness Rd, Hatston Industrial Estate, Kirkwall, Orkney, KW15 1RG T: + 44 ( 0) 1856 876101 www. cookeaqua. com Balta Isle Technical Modelling Report May 17, 2017 Table of Contents 1. Summary................................................................................................................................ 2 2. Introduction...........................................................................................................................3 3. Input data............................................................................................................................... 4 3. 1 Site data............................................................................................................................ 4 3. 2 Hydrographic data............................................................................................................ 5 3. 3 Bathymetric data.............................................................................................................. 6 3. 4 Bath modelling................................................................................................................. 7 4. Results.................................................................................................................................... 8 4. 1 Biomass............................................................................................................................ 8 4. 1. 1 Transects and sampling stations............................................................................... 9 4. 1. 2 Fate Assessment of Exported Material................................................................... 12 4. 2 In -feed treatments......................................................................................................... 15 4. 2. 1 Slice — Emamectin Benzoate.................................................................................... 15 4. 3 Bath treatments............................................................................................................. 19 4. 3. 1 Salmosan Vet — Azamethiphos................................................................................ 19 4. 3. 2 Excis - Cypermethrin................................................................................................ 20 4. 3. 3 Alphamax - Deltamethrin........................................................................................ 20 4. 3. 4 Alternative bath model — "Loch" scenario.............................................................. 20 5. Discussion............................................................................................................................. 21 6. References........................................................................................................................... 23 7. Appendices........................................................................................................................... 24 7. 1 Appendix 1 - Changeover to Salmosan Vet.................................................................... 24 7. 2 Appendix 2 — Data comparison of three Balta Isle hydrographic data sets ( 15 days)... 26 7. 3 Appendix 3 — Model outputs generated using the three Balta Isle hydrographic data sets....................................................................................................................................... 27 Cooke Aquaculture Scotland Page 1 1 27 Balta Isle Technical Modelling Report May 17, 2017 1. Summary Cooke Aquaculture Scotland Ltd. ( CAS) has undertaken biomass and chemotherapeutant modelling work for the marine cage fish farm site, Balta Isle in Shetland. The site is located off the west coast of the island of Balta in Balta Sound, a water body which runs between the islands of Unst and Balta. The proposed new set up at the site is for two groups of 10x100m circular cages arranged in 5x2 cage configurations. The site was modelled to determine the maximum biomass and the recommended consent limits of in -feed treatments and bath treatments in regards to the new infrastructure and the biomass being proposed. Site specific benthic monitoring transects were defined with a primary sampling transect originating from the north east cage on the northern cage group on a bearing of 21. 7° G. The recommended consent limits achieved are detailed in Table 1. Table 1 Summary of the Recommended Consent Limits for the Balta Isle site. Maximum Biomass 2, 184. 8t Stocking density 19. 6kg/ m3 In - Feed Treatments DCIILUd LC TAQ MTQ Mass ( g) 3, 823. 4 764. 7 Equivalent Treatable 10, 924 2, 184. 8 Biomass ( t) Bath treatments Azamethiphos Cypermethrin Deltamethrin 3hr 24hr 3hr 3hr Mass ( g) 130. 58 109 23. 64 8. 86 Equivalent Treatable 1, 306 1, 090 4, 727 4, 432 Volume ( m3) Cooke Aquaculture Scotland Page 2 1 27 Balta Isle Technical Modelling Report May 17, 2017 2. Introduction The proposed new cage setup at the Balta Isle site is to consist of 20x100m circumference cages. The cages will be split into two groups of ten cages arranged in 5x2 configurations. The cage groups will run parallel to the Balta coastline with the north site orientated to 319° and the south site orientated to 50°. The cages will be housed in 60m square grids with a net depth of 7m. The site centre of the north cage group is 60o45. 180' N 00°47. 895' W ( HP 65603 08370) and the site centre for the south cage group is 60°44. 955' N 00° 47. 966' W ( HP 65546 07951). Figure 1 illustrates the location of the Balta Isle site. The proposed new set up at the Balta Isle fish farm has been modelled to determine the maximum permissible biomass at the site and to produce a monitoring protocol recommendation for submission to SEPA. In addition, the quantities of the in -feed treatment Slice and the bath treatments Salmosan Vet, Excis and Alphamax have been determined ensuring they are compliant with the required standards set by SEPA under The Water Environment ( Controlled Activities) ( Scotland) Regulations 2011 ( CAR). Burrahrlr 81 7 Hdrpld5rck' " ' I R Thg , Pr yo- it l\ 77 y 2 ` 14 4arnivs 4ik ST r I Baltasoun3 ' s i Byr t i stord Beta TAl431 nW 1I1A[. r('_ 215 I $ I FI, WR, 1ps18rn10r$ n p 17 J, W?Ok gra 4 Uyeasuund 47 Mull K5 Crown copyright SeaZon e Sol ubo n s_ All rights reserved_ Licence No_ 052006. 001 31st Ju ly 2011_ Not to be used for navigation_ 0 • Balta Isle A( CULTURE SCOTLAND— Refusing to go with the flow Ma Figure 1 Site location Cooke Aquaculture Scotland Page 3 1 27 g1 Balta Isle Technical Modelling Report May 17, 2017 3. Input data 3. 1 Site data AutoDEPOMOD version 2. 0. 52 is used to simulate the release and deposition of waste feed and faecal material on the seabed from which the benthic impact is predicted. For in -feed treatments the area and concentration of chemical deposition are derived via simulation of the chemical load associated with this material. Residual discharge concentrations are calculated using aqueous discharge models for bath treatments ( BathAuto version 5. 1). The distance to shore parameter is taken as the distance from a site centre position located between the two cage groups 60045. 065' N 00047. 746W ( HP 65742 08159) to the nearest shoreline on Balta to the east. The average water depth is determined from the AutoDEPOMOD bathymetry grid file utilising the Surfer volume calculations. Background information on the techniques employed are detailed in a separate methods report Biomass and Chemotherapeutant Modelling Methods Report' which can be found on the USB flash drive. Site specific data for the Balta Isle site required by AutoDEPOMOD are presented in Table 2. Table 2 Site Input Data Site name Balta Isle Consent Number CAR/ L/ 1003872 Company Cooke Aquaculture Scotland Receiving water Balta Sound Site NGR 465742 1208159 Current meter NGR 465557 1208195 Distance to shore ( km) 0. 163 Average water depth ( m) 10. 3 Number of cages 20 Shape of cages Circular Circumference of cages ( m) 100 ( Radius— 15. 92m) Cage group configuration 2 groups - 5x2 Grid size ( ml) 60 Cage group orientation (* Grid) N group - 319° / S group - 50° Working net depth ( m) 7 Treatment net depth ( m) 1. 64 Cooke Aquaculture Scotland Page 4 1 27 Balta Isle Technical Modelling Report May 17, 2017 3. 2 Hydrographic data A hydrographic survey at the Balta Isle site was carried out in March 2016. The data and report was accepted by SEPA as being suitable for modelling purposes. A 15 day subset of data was selected running from 2 to 17 March 2016 using data from three specified depths that represented near surface, cage bottom and near seabed layers. Direction data are supplied pre -corrected to Grid North. Intermediate spring and neap tides were identified from tidal heights for the port of Baltasound Pier. Raw current velocity data was formatted for use in AutoDEPOMOD using the SEPA template ' temp- 20min- HGv3. xls' ( files created Balta Isle- HG. xls', ' Balta Isle- NS- b. dat', ' Balta Isle- NS- m. dat', ' Balta Isle- NS- s. dat'). The hydrographic input data is shown in Table 3 below: Table 3 Hydrographic Data Input Depth of current meter ( m) 14. 25 Height of surface cell from the seabed ( m) 8. 7 Height of middle cell from the seabed ( m) 6. 7 Height of bottom cell from the seabed ( m) 3. 7 Date Spring Tide commence 07/ 03/ 2016 Data record number) 121) Date Neap Tide commence 14/ 03/ 2016 Data record number) 289) Current Speed unit m/ s Mean Sea Level ( m)* 1. 42
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