30 pts Ethylene dibromide (ETB) has been found in some welsin state College, PA,

Question

30 pts Ethylene dibromide (ETB) has been found in some welsin state College, PA, ETB has a specific eavity of 22, and has a solubility of 42100e of water. The oral potency factor is 85 (m/kg day) and the Rrois 9,3 x 10 mg/kg-day. 1 What is the solubility of ETB in meu? (5 pts) 2. Calculate the safe concentration of ETB in the water considering both the RID and the oral potency factor. 10 pts) mg/L, 3. You decide to use pump and treat to remove the ETB from the groundwater. You are told that the aquifer is contaminated for 1000 ft. The groundwater has a concentration of 1 ppb and you need to remove it down to 0.05 ppb. The aquifer has a hydraulic conductivity of 1000 galVft -day, a hydraulic gradient of 0.003 and an area of 50 fta. Calculate how long it will take to remove the ETB to acceptable levels if you pump the water at the same rate as the flow in the aquifer. (10 pts) days 4. You are brought in as an engineer to remove the ETBfrom the groundwater. Your boss recommends that you look into bioremediation and soil/vapor extraction. What information would you need to know to determine if either of these techniques will work? (5 pts)

Explanation / Answer

And 1- solubility in mg/l

Solubility=.4 gr/100 gr

= 4 gr/ liter (1000 gr/ l)

= 4000 mg/ l

Answer 2-

Safe concentration = I/RFD

I- 85mg/kg-day

RFD- 9.3*10^3

=85/9.3*10^3

= 9.1*10^-3 mg/ kg- day

And 3-

T= KB

K- 1000 gal/ft ^3- day (Hydraulic conductivity)

b- 50 ft^3 (thickness)

=1000*50 ft^3-day

=50000 ft^3- day

Considering the contamination of 1000 ft only

Pumping hours = (1000)/(50000/24) hours

= 4.8 hours

4- Factors

Vapour pressure

Contaminant nature

Subsurface temperature

Permeability, Hydraulic conductivity

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