Action Resources, a hazardous and solid waste and environmental services firm, has acquired a solid waste firm and a hazardous waste company.

Action, based in Birmingham, Ala., purchased Stella Environmental Services, a Houston-based firm which specializes in municipal solid waste processing.

Action also bought Triad Transport, which hauls hazardous waste and other materials. The company is based in McAlester, Okla.

Both deals were for undisclosed amounts, according to statements on the firm’s website.

Stella provides waste transfer station management, including the loading and transportation of tractor-trailer loads of waste from in-town processing facilities to remote landfills.

Action Resources said the purchase of Stella gives the company a complementary specialized transportation services footprint; service and geographic expansion with no overlap; and several new key customers.

Wilf Roth leads Stella and joins Action as the president and general manager of the new business unit–Action Transfer Services. It operates in 13 locations with a fleet of about 120 owner-operators and six company drivers.

Triad Transport hauls a range of materials led by hazardous waste. With the addition of Triad Action expands its geographic footprint to McAlester; Phoenix; Houston, Salt Lake City; Columbus, Ohio; and satellite facilities in Fontana, Calif.; Pendergrass, Ga.; Benton, Ark. Triad also adds 150 tractors to increase Action’s total to more than 470.

Action Resources includes Action Environmental; Action Transfer Services; and Stone Trucking Co. The CEO of Action is Dean Flint.

It’s been a busy beginning of August for the industry’s hazardous waste firms. Boise, Idaho-based US Ecology Inc. sold off one of the businesses it acquired with its purchase of EQ Holdings Inc.–Allstate Power-Vac Inc., an environmental cleaning firm. US Ecology bought Allstate and other industrial services businesses in its 2014 purchase of EQ.

Meanwhile, hazardous waste giant Clean Harbors Inc. reported a significant drop in net earnings in its latest quarter, primarily because of business struggles in its oil and gas segment.