Authorities are back excavating an abandoned well in search of more human remains believed to be victims of the notorious "Speed Freak Killers."

San Joaquin Sheriff's Department Les Garcia says the search outside the farming town of Linden resumed Tuesday after rains forced a daylong postponement.

Authorities found more than 300 bone fragments at the site over the weekend.

Death row inmate Wesley Shermantine led authorities there after a bounty hunter offered him money for information about victims of his killing spree in the 1980s and 1990s. Investigators believe Shermantine and childhood friend Loren Herzog may have killed as many as 20 people.

Sheriff's officials set up a hotline for families that believe a loved one may have been a victim. Officials say they've received more than two dozen calls.