SAN DIEGO (CBS 8) - A 20-year-old man who drove under the influence of alcohol and drugs and caused a fiery single-car crash on Friars Road that killed two female passengers has been sentenced to 13 years in state prison.

Antony Schoenle pleaded guilty to gross vehicular manslaughter while intoxicated and other counts.

San Diego police investigators said Schoenle was behind the wheel of a 2000 Dodge Stratus that struck a curb in the 4800 block of Friars Road, veered onto an embankment and struck a large boulder, causing a fire which engulfed the car about 7:30 a.m. Saturday.

Schoenle was able to free himself from the wreckage, but his passengers - - best friends Lizzy Garcia and Lupe Acosta, in their early 20s -- were trapped in the car and burned to death.

Acosta's puppy also died in the accident.

Deputy District Attorney Steven Schott said Schoenle's blood-alcohol level was measured at .09 percent about two hours after the crash.

The defendant had consumed alcohol, marijuana and cocaine prior to the accident during a night of partying that began nearly 12 hours before the crash, the prosecutor alleged.