California utility company Southern California Edison on Thursday said its equipment “may be associated with” the ignition of the Hurst Fire, which burned alongside the Eaton and Palisades fires during January’s Los Angeles firestorms.

Southern California Edison (SCE), a subsidiary of Edison International , said on Thursday that it was probing whether its equipment was associated with the ignition of two Los Angeles-area wildfires this year.

Contractors test soil samples for contaminants like lead or mercury and remove tainted soil. If a section still tests high, crews remove 3 to 6 more inches of soil and retest. The goals of soil testing are to leave a property safe for families, children and pets as well as protect groundwater, wildlife and air quality.