The Denver Federal Center is located on land previously occupied by the Denver Ordnance Plant, a munitions manufacturing plant, during WWII. Due to the history of use of the land, the Colorado Department of Public Health and Environment and the U.S. General Services Administration formally agreed to investigate any lasting impacts on the environment. Soil contaminants such as pesticides, herbicides, metals, ploynuclear aromatic hydrocarbons, and asbestos were found on site. The Downing Reservoir on site was also found to contain contaminated sludge and sediment with elevated levels of copper, zinc, lead, silver, and chromium. Other contaminants in the reservoir included petroleum related chemicals and asbestos. DS Environmental has been working with the General Service Administration on the Federal Center cleanup project that has been unfolding over the past 10 years. The Federal Center employs about 6,200 employees and covers an area of about 670 acres. DS Environmental has assisted in the breakdown and careful combing and testing of those 670 acres to ensure that a thorough cleanup of hazardous materials takes place.