Sorption Question

Mr$.$ Smith bought Evergreen Farm in $2000.$ As shown in Figures $1$ and $2,$ an underground fuel tank and Well

$9821$ are located $50($m$)$ and $90($m$)$ North of the Blue River, respectively. The well is used only for land scape

irrigation with maximum pumping rate of $2\mathrm{.}52$ L$/$s $(60$ Usgpm$)$ during summer.

The local Authority Having Jurisdiction has recently $($January $2022)$ launched a water quality monitoring

program. The collected water sample downhill of Evergreen Farm showed higher than normal value of benzene

in the water sample. Further investigations revealed that the fuel tank is leaking. The tank was emptied

immediately and the remediation plan is ongoing.

You have been hired by Evergreen Farm to provide a professional environmental review. You met with Mr$.$

Smith. He brought you a package that he received from the previous owner relevant to the construction work

of Well $9821.$ It includes the following information:

The hydraulic conductivity of the aquifer is $2\mathrm{.}1($m$/$d$)$

The porosity of the media is $27\%$

The depth to water at Well $9821($static water table$)$ from the surface is $6\mathrm{.}4($m$).$ The Blue River water

surface is $38($m$)$

fraction of organic carbon in the aquifer sediments from drilling, foc$=0\mathrm{.}62\%$

bulk density of the soil or aquifer material, b $=1\mathrm{.}62($g$/$cm$3)$

For Benzene Log Kow is $2\mathrm{.}13$

For Benzene Log Koc $=0\mathrm{.}937$ Log Kow $-0\mathrm{.}006$

Mr$.$ Smith wants to know whether he could be responsible