Delaware Water Gap National Recreation Area Natural Gas Pipeline Enlargement Act

Delaware Water Gap National Recreation Area Natural Gas Pipeline Enlargement Act - Authorizes the Secretary of the Interior to grant an easement to the Columbia Gas Transmission Corporation to enlarge the diameter of a specified natural gas pipeline from 14 inches to not more than 20 inches, consistent with the recreational values and protection of the resources of the Delaware Water Gap National Recreation Area in Pennsylvania.

Authorizes the Superintendent of the Recreation Area to issue a permit to the Corporation for the use of the Recreation Area in accordance with specified procedural requirements for the temporary construction and staging areas required for the construction of the enlarged pipeline.

Requires the Corporation to comply with Federal Energy Regulatory Commission certification requirements for the increase in pipeline size.

Prohibits the Secretary from granting additional increases in the diameter of, or easements for, the pipeline within the boundary of the Recreation Area after the date of enactment of this Act.

Authorizes the Attorney General, at the Secretary's request, to bring against the Corporation a civil action for damages and response costs if the Corporation violates easement or permit provisions, fails to submit or timely implement an approved restoration and mitigation plan, or the violation or failure destroys, results in the loss of, or injures park system resources.