A total of 66 artifacts, including, two whole bottles, 11 bone fragments, and three shellfish pieces were recovered in the 1976 restroom block excavation.
At the request of local State Park staff, archaeologists from State Parks headquarters under the direction of Senior State Archaeologist D. Felton conducted archaeological excavations within the Casa de Estudillo yard plus one unit against the garden wall on the Casa de Pedrorena side in February and March 1989.
An artifact-rich feature was uncovered along the north yard wall that dated between 18. 1909 construction grade lies from six inches to one foot below the present-day grade, and that a “substantial” wall foundation of river cobbles and mortar was employed in the 1909 Waterman restoration.
According to Larry Felton, the 1989 excavations found neither clear evidence of the north wing addition seen in an 1869 photograph nor evidence of 19th century yard/garden walls.
A garage/storage building, measuring approximately 28 feet by 20 feet, stood at this spot then, but was demolished just prior to the 1976 archaeological excavations.
Archaeologists from California State Parks, Southern Service Center (a State Parks office located in San Diego California), under the direction of Michael Sampson, conducted archaeological and documentary investigations for the restroom replacement project in late 2007 and monitored construction of the replacement restroom during the summer of 2008.
was recovered during the 2007 excavations, from five units and two shovel test pits placed around the old restroom; these items have been cataloged under State Parks Accession P1554.
This yield of artifacts seemed remarkably good given the considerable amount of disturbance observed in all the 2007 excavation units.
Casa de Estudillo was sold by José Guadalupe and Salvador Estudillo to John Spreckels, a wealthy businessman, in 1906; the Estudillo family had ceased residing there by the late 1870s.
Wanting to restore the house as a tourist attraction, Spreckels’ company hired local architect Mrs.