The oil well is the first one to use pumping cement to aid in installing a shutoff valve.

The well is located at Unocal Corporation facility in the Mission Hills District of Lompoc.

The California Historical Landmark plaque and the well are 1.6 miles behind the gated facility in a canyon.

[1] The well is named after engineer Frank E. Hill who was the leader of the first successful pumping cement cap.

[2] The California State Historical Landmark reads: