NASHVILLE, Tenn. (AP) _ A utility is cleaning up a drilling slurry spill at a state natural area where it is laying a gas pipeline in Nashville.

Piedmont Natural Gas spokesman David Trusty told The Tennessean on Tuesday that the company regrets the spill and is working with state environmental officials to remove about 300 gallons of a clay mixture from Otter Creek in the Radnor Lake Natural Area.

Radnor advocate Clark Tidwell, a longtime Nashville attorney, said the mishap is what environmentalists feared when Piedmont got permission to cross the preserve.

An incident report from Piedmont stated the hydraulic pressure of boring was too great for soft soil conditions to withstand.