What major were you accepted into for UCSD? Will your transfer courses fulfill the Environmental Systems major?
http://physicalsciences.ucsd.edu/programs/esys/esys-major.html
You have until 9/22/16 to cancel your housing contract minus the $450 according to this link;
http://hdh.ucsd.edu/housing/docs/CancellationPolicy-Freshmen-Transfer-2016.pdf