Prøvetaking og analyser av sideterreng langs vei

The side terrain along a highly trafficked stretch of E6 by Skullerud south of Oslo has been examined for contamination. Soil samples along the stretch and a sample of drainage water from the stretch were analyzed for metals, THC, aliphatic and aromatic compunds, BTEX, PAH, PCB, organophosphorus flame retardants, DEHP and bisphenol A and F. In addition, the water sample was analyzed for benzothiazoles, benzotriazoles and microplastics. The leaching potential of pollutants from the masses closest to the road was measured by a leaching test. BTEX, PCB, organophosphorus flame retardants and DEHP were not detected in the soil or water samples. The highest concentration of metals was Zn >> Cu > Cr > Ni > Pb > As ≈ Sb > Cd > Hg in the soil samples, and Zn >> Cu > Cr > Pb ≈ Sb ≈ Ni in the water sample. The leaching test showed highest leaching of Zn > Cu > Pb ≈ Sb ≈ As. The content of THC and aliphatic compounds comprised mainly of compounds >C16-C35, while hydrocarbons <16C, and aromatics, were not detected. Bisphenol A was detected in all the samples, bisphenol F was detected in some of the soil samples and in the water sample. All the PAH substances that were analyzed, except acenaphthylene, were detected in one or more of the soil samples. Highest concentrations were detected of benzo(b,k)fluoranthene, fluoranthene, pyrene and benzo(ghi)perylene. Only pyrene was detected in the water sample. Of the benzothiazoles and benzotriazoles, 2-methylmercaptobenzothiazole, 1H-benzotriazole and 5-methyl-1Hbenzotriazole were detected. The analysis showed that the water contained >1500 microplastic particles per liter water, indicating that the road could be a source of microplastic emission. The side terrain along the southbound direction of the road stretch showed a tendency to contain higher concentrations of Zn, Cu, Pb, Sb, THC and aliphatic compounds compared to the side terrain along the northbound direction. There was no clear trend regarding the variation of pollutants from south to north along the road. The results indicated that the areas closest to the road (0–1.5 m) and the upper soil layer (0–5 cm) had the highest concentration of Cu, Zn, Sb, THC and aliphatic compounds, while the areas furthest from the road (3–4.5 m) and the deepest soil layer (5–10 cm) had the highest concentration of As, Pb, Hg and Ni. The concentration of PAH and Cd was highest furthest from the road, and the concentration of Cr was highest closest to the road, but there was no clear trend regarding the distribution of these substances in the soil profile. There was generally relatively high uncertainty related to the results as only one composite sample from each area was analyzed. To avoid such uncertainties, it is recommended to analyze several replicate samples. The masses in some of the areas, especially the areas closest to the road, contained concentrations of Zn, Cu, aliphatics >C16-35, PAH and benzo(a)pyrene above the normative soil quality criteria. The concentrations of the substances were below the upper limit of class 3 "moderate" in TA-2553/2009. Based on this classification, the masses do not constitute any health risk for use in traffic areas, and it is allowed to reuse the masses on the property. The masses did not contain concentrations of pollutants indicating that the masses should be classified as hazardous waste. The leaching potential and the content of organic substances in the masses indicated that they can be deposited on landfills for inert waste.