phase 4 report - DNV

RN07 // APPENDIXBarents 2020Appendix 3. Chemical analysisStandards for analysis:––Total organic matter: NS-4764 Determination of dry matter and burn residue in water, sludgeand sediments (Bestemmelse av tørrstoff og gløderest i vann, slam og sedimenter)––Grain size: Bale & Kenny (2005): Bale, A.J. & Kenny, A.J. 2005. Sediment analysis andseabed characterisation. In: Eleftheriou, A.; McIntyre, A.D. “Methods for the study of marinebenthos”. 3rd edition. Blackwell Science. Oxford, UK. ISBN 0-632-05488-3. pp. 43-86.––Total Hydrocarbons (THC), and 16 EPA-PAH and NPD: ANON, 1982. Manual and Guides No.11 (1982). The determination of petroleum hydrocarbons in sediments. IOC/UNESCO, Paris.––Metals:––NS-EN ISO 15587-2 ;––Hg : NS-EN 1483––GOST 17.15.01-80––GOST 17.1.3.08-82Components/species:Table A3-1 Sediment samples, sample sizes and analyses (Source: KLIF, 2011)Parameter Sample depth Benthic baseline andfirst monitoring surveysSubsequent benthicmonitoring surveys (2 ndand 3 rd etc.) 3Sample storage andsizeTOM 0–1 cm 1 sample(from the mixed samplefor grain size)1 sample -20° C100 gGrain size 0–5 cm Mixed sample from 3grab samples at thestationMixed sample from 3grab samples at thestation300 gHydrocarbons0–1 cm- THC1–3 cm-Synth. drilling fluid3–6 cm- NPD and PAHs 13 samples3 samples - 20° C1 sample 21 sample 2300 gMetals-Ba 4 , Cd, Cr, Cu,Pb, Zn, Hg0–1 cm1–3 cm3–6 cm3 samples3 samples - 20° C1 sample 21 sample 250 gMacrofauna 5 5 samples 5 samples 10% formalinBengal Red/ Eosin1 If THC exceeds 50 mg/kg, analyses of NPD and PAH are also required (in the upper 0–1 cm of the sediment only).2 Only the two downstream stations closest to the discharge point, if THC exceeded 50 mg/kg in the previous survey. Applies to NPD, PAHs and metals.3 The number of parameters to be analysed may vary depending on the degree of contamination and the level of activity on the field in question.4 Or an equivalent weighting agent (e.g. Ti).5 In the longer term, samples of the sediment meiofauna may be required in addition to the macrofauna, for example in areas that are inaccessible with conventionalsampling equipment.Report no 2012-0690 257