Municipal and Industrial Dredging Enviro Contractors Clearing Dallas Treatment Plant Pond
International Dredging Review
June/July 1991
Enviro Contractors, Inc. (ECI) is cleaning a waste treatment lagoon for the City of Dallas using two VMI Piranhas - track mounted cutterhead pumping units. The 14-acre pond at the South Side Treatment Facility is 15 to 18 feet deep and had filled up to about three feet of water with digested human waste - about 250,000 cubic yards
A VMI Dredges Piranha moving sludge from an Illinois lime pit.
Beginning on May 10, 1991, ECI used a Piranha on the bank to pump off the layer of water, moving it a half mile away to a filtrate screen where the solids were removed into Gehl fertilizer spreaders. The clear water returned to another pond.
The larger dredging unit is a ACAT231 Super Wide pad track hoe with modified low ground pressure swamp pads. The DS6 HN Piranha uses a Cummins 6CTA 8.3 Diesel engine and Hazelton 6-16 HNR 28 percent chrome sludge pump.
Both units pump through flexible tubing to J-stand at the disposal area, where the spreaders are loaded. Pulled by four-wheel-drive John Deere tractors, the spreaders haul the material to a disposal field and spread it to be disced under.
"The material is flowing to the Piranhas easily on this project," sayd Don Plyburn, Vice President of ECI's Industrial Division. "As we get to the bottom of the pond we have to use a long stick track hoe to drag the material over to the machines."
The Piranhas are pumping from several locations around the pond. When the crane can no longer reach the material from the bank, a pedestal of clay is dropped into the pond for the machine to sit on while dredging the area.
Before going to the Dallas job, ECI's CAT 231 Piranha was pumping sludge from a holding pond at the Star Enterprise Refinery in Port Arthur, Texas.
ECI was formed in 1989 to provide sludge handling sub-contract services in the Golden Triangle of East Texas. The founders had supervised the design development and field production of the long chain hydro-carbon sludge waste solidification system now in used on select environmental design closures.
In October 1989, the company expanded its operation to provide specialized heavy equipment and various field operations while developing the Enviro line of technical systems for handling petrochemical sludge and contaminated soil material at the Star Enterprise/Texaco refinery in Port Arthur.
The company set a new course in 1990 by introducing the integrated Systems Approach TM expanding its base into a full service environmental contractor offering a wide range of services to the private and public sectors around the world. This plan ties the company's functions together to provide a reasonable, cost effective, safe and timely way to solve difficult environmental cleanup problems.
The company operates with the following divisions: Environmental, Industrial/Mechanical Services, Civil, Municipal Waste and Affiliates.
The Environmental Division has hauled and processed more than three million cubic yards of petrochemical sludge, contaminated soils and industrial waste materials. They have remediated and reconstructed more than 10 miles of contaminated specialty water ways, flood control and drainage ditches, pacing more than one million cubic yards of sand, clay and other materials to rebuild ditches and levees in preparation for about 35,000 cubic yards of Enviro-Crete (concrete, shotcrete and /or gunite) placement.
The Industrial Division holds an annual routine preventative maintenance agreement and is engaged in a major retrofitting project a the Chevron, USA refinery in Port Arthur, Texas.
The Municipal Waste Division specialized in all phases of waste handling as well as a range of general construction services tailored for waste water treatment plants. The company's bonding abilities allow it to pursue publicly-funded projects.
The Affiliates Division provides specialized contracting and professional services for EFI on a worldwide basis. The E.E.S.I affiliate provides state of the art hydrocarbon waste separation processing used in conjunction with storage tank cleaning and contaminated lagoon cleanup projects. The ESI affiliate provides environmental engineering services and turnkey air and water pollution projects.
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