groundwattr at a shallowgroundwater residential property is contaminated with naphthalene. henry's law constant at $15$ degree celcius is $2\mathrm{.}7\backslash$times $10^-4$ atm$-$m$3/$mol$.$ odour threshold for naphthalene is $0\mathrm{.}04pp{m}_v$ at $25C($the temperature indoors$).$

What is the maximum groundwater concentration for naphthalene before we will get an odour problem indoors?