Driveway washout repair

Got a call from a long time client in January that his propane tank was undermined. went out to the property and was able to move the propane tank near the house and re plumbed it to the house. that night the driveway wall fail and slide down the canyon. the next break in the rains we have to clean another slide on the driveway to gain access. we installed a curtain or french drain on the uphill side to re leave some of the ground water that was traveling under the road. next we hauled in boulders and staked them in the slide to stabilize it for the rest of winter. Though the winter we planed and designed the permanent fix witch was to build an I-beam wall with concrete lagging wall below the block driveway wall and tie back into the existing block wall to re build it as well. All this brought the driveway back to full wide and the propane tank back to it original spot.