The Mallory Valley Utility District operates a two million gallon water supply tank. The tank was constructed partly on cut and partly on fill. The fill slopes began moving and cracks were observed adjacent to the tank. GA engineers designed a non-conventional slope stabilization system consisting of reinforced concrete reaction blocks supported by tendon anchors socketed in rock. This method had been used successfully to stabilize embankments for the railroad industry. The system was installed by specialty contractor Hayward Baker at a lower cost than a conventional tied-back retaining wall.