Yes. the school sits on top of the former Mill Valley Dump.
The Biggio Brothers owned the property from the 1920s into the 1950s and accepted wastes from the city of Mill Valley and private haulers. Mill Valley Middle School, Mill Valley Recreation Center, soccer and baseball fields all now occupy the old dumping ground. Soil testing done in the 1980s and 1990s revealed that chemicals, including antimony, arsenic, benzene, toluene and heavy metals had contaminated the soil and groundwater. Alarm systems were installed in the school and recreation center to alert people if landfill gases into the buildings. Pipes installed in the dumpsite collect the chemical gases and release them into the air at the rooftops.
I'm surprised and saddened that the community isn't more concerned about the health and safety of residents, especially children. who spend long hours on this toxic dumpsite.