Looking for Gravesite of Modena F Woodcock

I am looking for the gravesite of my ggrandfather, Modena Francis Woodcock who died in Mussel Slough, Calif. May 29, 1880 from injuries that he had obtained in the Civil War. Once I am able to locate his grave site then the Sons of the Confederate soldiers will be able to place a permanet marker. Any help will be appreciated.

After his death, my ggrandmother took the children back to Arkansas via the train.

Thank You,
Betty