the ability to communicate effectively in English, and comprehend in English is an important factor in the application process...
while a 30 on the RC section may not guarantee you an "in" at a school and a 14 may gaurentee your application be thrown away...do not discredit the section.
although English is not the offical language of the US, it is one of the most spoken languages and that is why it is important to know it
there are also writing samples (at interviews) and an interview you have to think about, i hope that you are able to communicate effectively in English to get through these hurdles should you get an interview
with that said GOOD LUCK! 🙂