SAM e-Rapport Seksjon for anvendt miljøforskning – marin Uni-Research e-Report nr.9-2015 Recipient survey in relation to exception from secondary treatment of sewage emissions in Lindås municipality, 2013 Stian Ervik Kvalø Ragni Torvanger Marte Haave Tone Vassdal Trond Einar Isaksen Per Johannessen Uni Research – SAM-Marin Resipientundersøkelse 2013 Side 2 av 141 P.nr 807367 Uni Research – SAM-Marin Resipientundersøkelse 2013 Side 3 av 141 P.nr 807367 Uni Research – SAM-Marin Innhold 1. Introduction ..................................................................................................................................................... 5 2. Materials and methods ........................................................................................................................................ 7 2.1 Survey area ..................................................................................................................................................... 7 2.2 Nutrients ...................................................................................................................................................... 13 2.3 Chlorophyll and secchi depth (transparency) .............................................................................................. 13 2.4 Bacteria ........................................................................................................................................................ 14 2.5 Oxygen ......................................................................................................................................................... 15 2.6 Sea Bed surveys ............................................................................................................................................ 15 Sediment surveys ........................................................................................................................................... 15 Soft bottom fauna survey .............................................................................................................................. 16 2.7 Littoral survey............................................................................................................................................... 17 Grid analysis ................................................................................................................................................... 17 Semi quantitative littoral survey .................................................................................................................... 18 Mathematic analysis for grid analysis ............................................................................................................ 19 2.8 Environmental chemistry ............................................................................................................................. 19 2.9 Measurements of currents ........................................................................................................................... 23 2.10 Deviations and changes in relation to the survey program ....................................................................... 23 3. Results ................................................................................................................................................................ 24 3.1 Nutrients ...................................................................................................................................................... 24 3.2 Chlorophyll-a and secchi depht (transparancy) ........................................................................................... 28 3.3 Bacteria ........................................................................................................................................................ 28 3.4 Oxygen ......................................................................................................................................................... 30 3.5 Sea bed survey ............................................................................................................................................. 31 Sediment examination ................................................................................................................................... 31 Bottom fauna analysis .................................................................................................................................... 32 3.6 Littoral survey............................................................................................................................................... 34 Grid analysis ................................................................................................................................................... 34 Semi quantitative survey ................................................................................................................................ 35 3.7 Environmental chemistry ............................................................................................................................. 37 Sediment ........................................................................................................................................................ 37 Biological material .......................................................................................................................................... 40 3.8 Measurements of currents ........................................................................................................................... 42 4. Summary ............................................................................................................................................................ 43 5. Thanks ................................................................................................................................................................ 51 6. Literature ............................................................................................................................................................ 52 7. Appendix ............................................................................................................................................................ 54 Appendix 1: Generell vedleggsdel ...................................................................................................................... 54 Appendix 2: Analysebevis miljøkjemi i sediment ............................................................................................... 64 Appendix 3: Analysebevis miljøkjemi biota ........................................................................................................ 67 Appendix 4: Analysebevis geologiske analyser .................................................................................................. 70 Appendix 5. CTD-målinger.................................................................................................................................. 85 Appendix 6: Næringssalter ................................................................................................................................. 90 APpendix 7: Artsliste bunndyr ............................................................................................................................ 94 Appendix 8: Geometriske klasser ..................................................................................................................... 101 Appendix 9: Topp ti artsliste ............................................................................................................................ 102 Appendix 10: Cluster-analyse ........................................................................................................................... 104 Appendix 11: Artsliste semikvantitativ littoral ................................................................................................. 105 Appendix 12: Arter og utbredelse .................................................................................................................... 107 Appendix 13: Stasjonsskisse ............................................................................................................................. 108 Appendix 14: Artsliste ruteanalyse .................................................................................................................. 109 Appendix 15: Strømmålinger ........................................................................................................................... 111 Resipientundersøkelse 2013 Side 4 av 141 P.nr 807367 Uni Research – SAM-Marin 1. INTRODUCTION In 2013 to 2014 a recipient survey was conducted to be used for an application to not have to perform secondary treatment of sewage in relation to a potential new sewage treatment facility. The survey was conducted in areas 1 and 9 (Figure 1.1) as part of a larger survey «Resipientovervåkingen av fjordsystemene rundt Bergen 2011-2015» (Kvalø et al., 2014). The area between Knarvik east and Alvermarka in Lindås Municipality is defined as a densely populated area, with approximately 8 300 person equivalents (pe). It has been estimated that in 2020 this number will reach 15 000 pe. In the central Knarvik area there are now 8 waste effluents which go to Osterfjorden and Radfjorden. In 2020 there will only be two waste effluents, one at Kvassneset (Osterfjorden) and one in Radfjorden. Figure 1.1 Map over municipalities and area designation in “Resipientovervåking