A Northern California family continued an excruciating wait for answers Wednesday as investigators continued excavation for human remains at the mass grave made by the "Speed Freak Killers."

Investigators said they have hit bottom at the site in San Joaquin County near the town of Linden where they've been digging out a well.

The work continued Wednesday, with the dig approaching 50-feet in depth. Investigators said it appears to be nearing an end. But so far, no victims have been identified from the site.

"What I'm being told is there's very little remains in those piles," said San Joaquin County Sheriff’s Department spokesman Les Garcia.

About 1,000 bones and bone fragments have been unearthed along with women's shoes, a purse and jewelry.

And closely following reports from the grim excavation are Alisa Baca and her 100-year-old grandmother Eva Baca.

KTVU talked exclusively to the family that is waiting for answers from this dig decades after their loved one disappeared.

"It's hard growing up when you don't know where your mother is," said Alisa.

Alisa was 8-months-old when her then 34-year old mother Sylvia Standly went missing in downtown Modesto in 1986.

Standley had called her family to say she would be home soon, but never arrived.

"And I never saw her again," said Eva Baca, Standly’s mother.

They learned of the dig site in Linden from a relative. Investigators were led here by a map drawn by Death Row inmate Wesley Shermantine.

He and Loren Herzog are believed responsible for 20 or more murders in the '80s and '90s. There's no direct link to Standly, but Alisa thinks there may be a connection.

"Just the fact that they disappeared at the same time," said Alisa. "A lot of people had families that just disappeared and never came back."

They will have to wait for answers. The bones brought up here must be DNA tested for matches. There's also another nearby well that could contain more remains.

A private investigator in the Stockton area has a list of women he believes were victims of the "Speed Freak Killers."

Rob Dick says he has been compiling a list of missing person cases for the last decade and that eight of the women in his binder could be victims of Shermantine and Herzog.

He said the women just disappeared and the cases were never solved.

"Vanishing. Out alone. Late at night a lot of the times and just kind of vanish, said Dick. Not to get families hopes up, but I do think we're on the right track."

Among them are Susan Bender, who was last seen getting into a green van in April of 1986 outside a bus station in Modesto.

People who believe they have a loved one who fell prey to Loren Herzog or Wesley Shermantine are asked to call (209) 468-5087 or email their name, phone number, the name of the missing person and case number to coldcase@sjgov.org.