GLEC provides environmental engineering, monitoring and technical services to the U.S. Army’s Pine Bluff Arsenal, one of the Army’s largest (21 sq. miles) chemical weapons production and storage facilities. GLEC has provided services to Pine Bluff Arsenal (PBA) since 1996 through multiple contracts as the prime contractor. Integrated environmental research and engineering services include biological and groundwater assessments, water quality testing and permit compliance. GLEC’s environmental services are used to determine the potential for adverse environmental effects, both acute and chronic, from PBA’s operations and regulated storage sites. Ecological surveys on the arsenal including fish and benthic macroinvertebrate surveys, bioaccumulation studies on fish, and water and sediment monitoring. Ecological Risk Assessments have been performed to evaluate potential groundwater impacts venting to surface water bodies and an ongoing evaluation of groundwater practical quantification limits in conjunction with USEPA Region 6 drinking water quality criteria. Semi-annual groundwater monitoring is conducted at regulated sites and annual groundwater monitoring reports are prepared for the Arkansas Department of Environmental Quality that involve statistical evaluation of groundwater quality data, GIS interpolation of groundwater data, and evaluation of groundwater flow and direction. GLEC also assists the PBA facility GIS geodatabase and mapping services, including archiving environmental documents and georeferencing historical imagery of the Arsenal going back to the 1940’s.