Cleanup at the Guadalupe oil field has been halted for as long as 2 1/2 years while Unocal Corp. and government officials try to find a new way to dispose of huge amounts of contaminated sand.
Unocal has discovered that its system of bioremediation, in which the contamination is allowed to naturally decompose to safe levels, is not working fast enough to allow the oil-tainted sand to be safely placed back into the ground.
