During the construction activities at an industrial facility, it was observed th

Question

During the construction activities at an industrial facility, it was observed that some damage occurred to the two underground storage tanks (USTs) releasing some contaminants to the vadose zone as follows:

a. The 250-gallon underground storage tank damaged releasing chlorobenzene (in the vadose zone).

At the time of incident, neither of the tanks was full, but had some material stored in them.

During site investigations, the vapor concentrations in the vadose zone were measured as:

Chlorobenzene 8 ppmV

Assume: The porosity of soil is 30% and 35% of the porosity is occupied by water.

Assume: Ambient temperature is 20C

Assume: 1 mole of ideal gas occupies 24 liters at 20C

Bulk density of soil: 1.8 g/cm3

Fraction of organic carbon in soil : 8 % (f=0.08)

7.48 gal = 1 ft3

1 m3 = 1,000 liters

Using 1 m3 of contaminated soil as the basis for your calculations, determine the following in the units indicated: (refer to the example on p. 53) practical design calculations for ground water and soil remediation.

c. Liquid volume (m3)

d. Concentration of chlorobenzene in the liquid phase (mg/m3)

The selected properties of the contaminants are as follows:

Relevant properties of the contaminants are as follows:

Parameter                       Contaminants

                 

                                      

                                    Chlorobenzene                                                       

                  Benzene

Henry’s constant (dimensionless)

1.52x10-1

2.28x10-1

Molecular weight

112.6

78.1

Koc (L/Kg)

2.19x102

5.89x10

Density (at 20oC) (g/cm3)

1.106

0.876

Solubility (at 20oC) (mg/L)

4.90 x102

1.78 x103

Vapor pressure (mm Hg)

1.36

76

Note: The values provided above are from Chem Eng Handbook. Please use these values in your calculations.

Required information:

A. Summarize your results in a table listing the results (from a-i above) for each contaminant.

B. Estimate the maximum concentration of benzene (ppmV) (in the gas in vadose zone) if there was any free product (as benzene) above the groundwater. (refer to example on p.42)practical design calculations for ground water and soil remediation.

C. Comment on:

- Behavior and distribution of the two contaminants in the vadose zone (DNAPL, LNAP, Kp etc)

-

Relevant properties of the contaminants are as follows:

Parameter                       Contaminants

                 

                                      

                                    Chlorobenzene                                                       

                  Benzene

Henry’s constant (dimensionless)

1.52x10-1

2.28x10-1

Molecular weight

112.6

78.1

Koc (L/Kg)

2.19x102

5.89x10

Density (at 20oC) (g/cm3)

1.106

0.876

Solubility (at 20oC) (mg/L)

4.90 x102

1.78 x103

Vapor pressure (mm Hg)

1.36

76

Explanation / Answer

In some cases, emergency response actions must be taken ... Guidance from EPA on how to prevent UST releases, including spill protection, ... Releases may also be identified during tank upgrades or replacements as these activities

Groundwater is not in underground lakes, nor is it water flowing in ... When rain falls or snow melts on the surface of the ground, some water may run off ... The water table is the level at which theunsaturated zone and the saturated zone,. The Utah State Underground Storage Tank (UST) program is a regulatory

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