Aggregate Industries Billingsley
Road HMA Production Facility


Retaining wall at the cold feed system is constructed from salvage
materials originally incorporated in the Georgetown Trolley Line.

This new Astec double barrel, four hundred ton per hour, portable plant is located near Waldorf Maryland. The facility is ideal for the production of stone matrix asphalt. The twenty-acre site was designed by Gary Stillmunkes and the Astec engineers. All of the stockpile areas are fully paved and are on a 3% grade to insure rapid drainage of stored materials.

Access into the facility is controlled by an internal routing system that directs incoming traffic across a seventy-five foot long truck scale; while all exiting traffic leaves after loading by way of a one-hundred foot long truck scale. This scale is positioned under three, three-hundred ton storage silos. There are provisions for a fourth silo if volume warrants its construction.


New 400 ton per hour portable Astec Double Barrel Plant
with vertical oil tanks and 900 tons of HMA capacity.

Supplies for the new facility include four vertical storage tanks, two individual thirty-thousand gallon asphalt tanks and an agitated twenty-thousand gallon asphalt tank. In addition to that, there is another twenty-thousand gallon vertical tank used to fuel the production facility. Seven cold feeds and a rap feeder control the aggregate being sent to the plant. A seventy-two thousand cubic foot per minute baghouse controls particulate emissions.

Louis Ebert is the HMA Production Manager for this new facility and was the operator of the drum plant that this new facility replaced. The old facility was the Maryland State Highway Administration HMA Plant of the Year in 1999. This new facility will easily qualify for the NAPA Diamond Achievement Award. Paul Stonestreet is the Quality Control Manager of the completely new facility and operates a state of the art laboratory. This lab includes a Troxler gyratory compactor and an NCAT oven for precise quality control testing.

The plant was delivered on February 7, 2002 and produced its first ton of HMA on April 1, 2002. A final occupancy permit and a major SMA project are all that is necessary to allow Gary Stillmunkes to feel that he has successfully completed construction of a facility which we already know is a winner.


New plant utilizes seven cold feeds and a rap feeder.


Fully equipped state of the art QC facility includes Troxler SGC.