Taken from:http://www.spl.usace.army.mil/cms/index.php
LOS ANGELES--Whether simple letters or elaborate, colorful designs, tagging--or graffiti--is considered vandalism and is getting a cover-up along some 100 miles of rivers, creeks, washes and channels of the Los Angeles County Drainage Area and Santa Ana River Basin. Crews from Corps of Engineers contractor BJD Resourcing are removing graffiti by water blasting rock-grouted surfaces. According to the project manager, the process helps keep the natural look of the surface.
"Other areas, where it’s a concrete wall or concrete embankment, we go ahead and cover it over with an approved paint, a waterway-safe paint," said Jeff Vaughn, project manager, BJD Resourcing.