i need help on enviromental impact

timer Asked: Sep 15th, 2015

Question description

1.  An oil-storage area was abandoned 18 years ago. Oil spilled on the ground had saturated the soil at a concentration of 400mg/Kg of soil. A fast food chain now wants to build a restaurant at the site, and samples the soil for contaminant, only to discover that the soil still contains oil residue at a concentration of 20mg/kg. You are consulted as the expert environmental engineer on biodegradation of oil spill to give advice.  Having identified the microorganism involved the biodegradation and discovered that its mode of action is zero-order reaction with a reaction rate of 20 mg/kg-year, you concluded that in one more year the site will be free of all contamination

1.  Is this a good conclusion? Show how you reached your decision.

2.  How long will it take for the soil concentration to be below the acceptable EPA Maximum Contamination Level (MCL) of oil is 1 mg/kg of soil?

4. A 1.5 million gallon water reservoir in Avila Beach in California was contaminated by oxygenated gasoline containing 0.5% by weight of MBTE when the pipeline busted. If the estimated volume of gasoline released into the reservoir was 5000 gallons and the specific gravity of gasoline is 0.870. Density of water is 1000kg/m3. Calculate in ppb the concentrations of

i.  Gasoline in the reservoir

ii.  MBTE in the reservoir

5. The recent Deepwater Horizon oil spill released crude oil into gulf of Mexico

    1. What volume of oil was released before the gushing wellhead was capped?
    1. Seventy five percent of this oil was removed by a combination of methods including burning, biological degradation, and evaporation, recovery at well, chemical dispersion and skimming at the surface. Assuming that the density of crude oil is 850kg/m3, what is the concentration of crude oil in the gulf area in ppm? (Hint: You need to find out the area affected by the spill. Assume that the depth is 16,000feet).  Give references to all data used.
    1. Irene just dumped a substantial amount of rain in the gulf and at the same time spread the residual oil over a much greater area. Assume that depth of water increased by 5% and the area of distribution of the residual oil is 25% increase over the original area. What is the concentration of residual oil in the gulf as a result of the spill assuming there is negligible degradation of oil since the spill.

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