The Warren County Landfill is a lined landfill (approximately 18 acres of liner) and is currently active with top grade at about 580 ft of elevation. Grades at the top vary from typically 450 feet along the north side to nearly 550 feet along the south side. The total area capped is about 22 acres. OEI provided slope stability evalutation and quality control and quality assurance services during construction of the landfill cap. Services included preparation of the geotechnical specifications, observation of installation of cap layer fill materials and geomembrane liner.