The builders of an apartment complex have agreed to pay $335,000 to settle allegations that workers improperly handled asbestos-containing material during the redevelopment of a former mill in Lawrence, Attorney General Maura Healey said Tuesday.

The agreements entered Friday settle allegations that Washington Mills II LP – a subsidiary of Watertown-based SMC Management Corp. – and PC Construction Co., of Vermont, violated the state’s Clean Air Act and the Solid Waste Management Act.

The companies are redeveloping two former brick-and-beam mills into a large residential and commercial complex.

Healey’s office said workers illegally stockpiled and reused excavated asbestos-containing material and other solid waste without required surveys or approvals. They also failed to properly abate the asbestos-containing material and to follow any workplace safety requirements intended to prevent exposure to asbestos, the office said.

Under the terms of the settlements, Washington Mills has agreed to pay $175,000 and PC Construction has agreed to pay $160,000, with $30,000 suspended pending compliance with the consent judgment filed in Suffolk Superior Court in Boston, Healey’s office said.

Asbestos is a mineral fiber used in a wide variety of building materials. If improperly handled, it can lead to life-threatening illnesses, including asbestosis, lung cancer, and mesothelioma, Healey’s office said.