Oily contaminated soils are soils that have oil spills on them from different source (either crude or refined oil). Normally they are transported to certain landfills. The treatment might be costly. So, they can be treated from hydrocarbons to certain level and then reused in some useful applications. Sometimes, they can be reused directly.
Dear Mahad,
If there is still some residual contamination, then it will be a case of assessing the risk for the end use. Low risk end uses such as fill for road or car park construction is a good option if the material is geotechnically suitable. Use for fill under or around housing commercial construction projects would require a higher degree of assessment and may not be suitable for some materials. The Australian Guidelines I think I may have referred to in a previous post provide risk assessment and remediation targets for particular end uses (see below). I think if you can find an organic matter source to promote bioremediation, you have good conditions in Oman (I imagine many soils are free draining, you can control moisture content and have little risk of run off from remediation facilities).
http://www.nepc.gov.au/system/files/resources/93ae0e77-e697-e494-656f-afaaf9fb4277/files/schedule-b1-guideline-investigation-levels-soil-and-groundwater-sep10.pdf
Regards
Andrew
Thanks Andrew. how about using such materials in constructing roads in desert areas which are far from residential houses? Have you seen similar cases? (TPH >5%) and groubdwater groundwatermore than 50m beliw belowground level
Mahad, I dont have a specific example, but if you did a risk assessment with your scenario you have very little leaching potential (low rainfall, high evaporation rate), you have capped the contamination (making sure the edge of the bitumen extends beyond the extent of the fill) and effectivly reduced leaching poteltial to as close to zero as is practicable and groundwater is deep. If the alternative is dumping in a hole in the ground (closer to groundwater and with potentil for leachate production from putricible waste ) I think the risk would be less. if used under roads and removed access to people and wldlife
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