At approximately 0238, CHP and LAFD responded to reports of a semi tanker that had crashed. Arriving units found a solo semi truck with an empty fuel tanker, that had struck a wall and jackknifed on the right shoulder. The semi truck driver was ejected from the vehicle. The victim was transported to Northridge Hospital in critical condition. CHP has issued a hard closure SIGALERT for an UNKNOWN DURATION for the EB101 #3 &4 Lanes due to 100 feet of immediate hazard guardrail damage and approximately 40 gallons of diesel fuel leaking from the semi tractors fuel saddles. The cause of the crash is unknown. LACoEMS HAZMAT has been requested to the scene. CHP West Valley is handling the incident.