During site investigations of a former gas station, a soil sample was collected

Question

During site investigations of a former gas station, a soil sample was collected in unsaturated silt at 2 meters below ground surface. The water table is located at 4 meters below ground surface. A laboratory analysis of the soil sample for TCE found a concentration of 1 mg/kg in this sample. The owner states he never used TCE on the site and the soil must have been contaminated by the underlying ground water, which is contaminated by a neighboring business. If the measured TCE concentration in the ground water is 10,000 mug/L, show mathematically if it is a reasonable hypothesis that the soil was contaminated by the underlying ground water. You can assume steady-state conditions, a temperature of 298K, that the soil has a porosity of 0.4, that the soil saturation is 0.25, that the bulk density of the soil is 1.65 g/mL, and that the soil fraction organic carbon (f_OC) is 0.001. Assume that the soil gas concentration follows a linear profile through the unsaturated zone, with C_g = 0 at land surface. You can also assume that there is no soil gas advection or biodegradation within the vadose zone.

Explanation / Answer

answer- Trichloroethylene (TCE) is halogenated aliphatic hydrocarbon compound. it is used as ingredient in industrial cleaning solution and universal decresing agents. it is most volatite organic chemical in groundwater. it is hazardous of human being it have direct impact on human liver. it is occured in vadose zone where pore spaces are partially filled with water and also in saturated zone where pore spaces are completely filled with water.

depth of sample is 2m

depth of water table is 4m

and amount of TCE concentration is 1mg/kg

contamination of TCE in groundwater 10,000 ug/L

soil porosity = 0.4

soil saturation is = 0.2

bulk density of soil is 1.65g/mL

soil fraction organic carbon (foc) = 0.001

TCE do not transformed to environmentally safe compound. Bioremidiation is requite for the elimination of TCE from groundwater

Related Questions

Navigate

• Browse (All)
• Browse D
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.