CABRILLO Historic Structures Report

REPAIR PROCEDURES (continued)

Graffiti

Description

Graffiti refers to non-original surface markings. Common media include chalk, ink, pencil, spray paint, and felt-tip pen. Many of the bunker interiors along the Bayside Trail have serious graffiti problems. Some structures also feature painted or penciled markings from the period of significance. These marks may have aided in the use of the structures.

• Graffiti. Examples: Lower Base-End Station at Billy Goat Point, Base End Station Battery McGrath.

• Historic Graffiti. Examples: Markings at the Battery-End and Base-End Stations, Calef & Wilkeson, which presumably marked orientation data.

Figure 40. Transit graffiti at the Base-End Station, Batteries Calef & Wilkeson.	Figure 41. Transit graffiti at the Battery Commander Station, Battery Humphreys.	Figure 42. Graffiti on corrugated metal at Battery Point Loma Bunker Complex.

Recommendations

1. Conduct a survey to locate and determine the extent of graffiti. Retain and preserve significant graffiti.

2. Remove non-historic graffiti using the gentlest means possible. Test the area first to make sure the substrate is not harmed and that significant paint surfaces are not removed. Begin with tri-sodium-phosphate and water and then try other chemical removers if necessary.