We currently perform these engineering services related to natural gas transmission, distribution main design, station design (M&R, gate stations, & regulator stations) & customer services (residential and commercial) for a variety of natural gas customers throughout the Northeast. DDS Engineering & Surveying, LLP (DDSE), is an experienced and highly qualified natural gas/civil engineering, permitting and survey firm that has been performing consulting engineering and construction services in the natural gas industry for many years.