GKN Aerospace cleanup in Garden Grove begins Monday — here’s what to expect

A hazardous materials team will begin working Monday to remove neutralized methyl methacrylate from two of three tanks at the GKN aerospace facility in Garden Grove.

Some 50,000 Orange County residents were evacuated for several days last month after one of the tanks overheated on May 21, causing fears of an explosion or a leak through the Memorial Day weekend.

The clean-up will be done in phases, until Thursday, “with multiple layers of safety protocols and oversight measures in place,” according to a press release from the Orange County Health Care Agency.

Containers that support temperature control and secure transportation will be used in the operation.

Cleanup was initially scheduled to begin June 4, but was postponed after officials said “needed resources” were unavailable.

Orange County District Attorney Todd Spitzer launched an investigation into the incident last month. The FBI and Environmental Protection Agency also seized evidence at the facility earlier this month.

Methyl methacrylate produces a fruit-like odor, Orange County Health Care Agency said residents may notice the scent during the operation. The agency said levels will remain below thresholds that could pose health risks.

Officials say environmental protection will be in place throughout the week. Air will be continuously monitored through both mobile and fixed equipment at the fence line of the facility and in the community. Air and odor monitoring based on wind conditions will also be done. Work will occur only during the daylight hours until Thursday.