The corrent, operational Keystone cuts across the NE corner of the Ogalalla Aquifer. The new proposal, OKeyed by Nebraska, almost misses it.

Take a look at this map (the black and white one) wwhich shows current pipelines carrying Canadian petroleum (including batches from the Alberta bitumen sands) in the U.S.

The proposed Keystone extensions offer a more direct route to the Gulf an replace older, slower routes.

http://www.google.ca/imgres?imgurl=http://www.neb.gc.ca/clf

or just google U. S. Oil Pipelines and enlarge the images.

NOTE:Does not include other pipelines carrying product other than crude, including chemicals.

News reports ignore previous infrastructure, some of which could be more injurious to the environment than the Keystone additions.
Oklahoma is heavily covered by pipelines, some of them "antique."