TPD coordinated extensively with local utility companies to review existing utility plans and identify any potential conflicts that could arise during design. The team worked closely with the project surveyor, reviewing CAD files and preparing markups to request additional survey information needed for the water main replacement design. Using this data, TPD designed a proposed network of water mains while determining whether each segment of the existing main should be removed, abandoned, or remain active.

As part of the design process, TPD identified proposed service lateral locations and developed typical sections illustrating temporary travel lanes and the approximate positions of both existing and proposed water mains beneath the roadway. The team also prepared detailed plan and profile sheets showing pipe lengths, sizes, bends, tees, tap sleeves, and gate valves.

Environmental and construction considerations were also addressed, including the design of erosion and sediment control best management practices such as inlet protection, bypass pumping, compost filter socks, rock construction entrances, and stockpile areas. TPD calculated quantities for all bid items to support accurate contractor pricing and developed site‑specific traffic control plans showing work zones, temporary lanes, and channelizing device tapers, while determining when NJDOT or Warren County standard details were sufficient.

Throughout design development, TPD established construction sequencing, estimated phase durations, and provided utility company with regular project status updates and coordination meetings. The team prepared the full water main replacement plan for review by the Town of Phillipsburg, Warren County, and the Upper Delaware Soil Conservation District, addressing all comments to secure necessary approvals. TPD also attended pre‑construction meetings to answer contractor questions related to the water main design, ensuring a smooth transition from design to construction.