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SOIL - LANDFILL DESIGN solutions During the mid-1980's, landfill construction underwent numerous design changes promulgated by federal regulation. Materials of construction have continued to improve, however, basic landfill design has not changed in ten years. Two-thirds of existing landfills in the United States have closed since 1990. Landfills which remain in operation are being expanded, either vertically or horizontally with new cell design. Surface impoundments or waste lagoons, have also grown in popularity as opposition to full scale landfill designs has increased. Read about one of these projects here. Call us at (302) 798-3100 to discuss your landfill questions.    Path: Concern > Soil > Landfill Design