Groundwater plagued the dedicated onsite systems serving the five buildings comprising Dartmouth Village, a senior housing complex in Columbia, Connecticut.
Each system had a septic tank and a gravity-fed drainfield of 4-by-4-foot concrete galley leaching chambers installed perpendicular to site contours and in silty clay soil. (Based on older maps, the property should not have been developed, since the area was historically wetlands.)“High groundwater kept this area wet even during the dry season,” says John Holden. His company, Holden Construction in Broad Brook, Connecticut, won the bid to replace the systems. Mark Green of Green Construction Management in Waterbury, Connecticut,
