The Long Island Rail Road’s (LIRR) Double Track Project will dramatically increase capacity of the Ronkonkoma Branch along 18 miles between Farmingdale and Ronkonkoma. The addition of the second track will allow the LIRR to provide more frequent off-peak service to the Ronkonkoma Branch in both directions and will increase flexibility and reduce delays associated with service disruptions. Phase I of this project includes the design and construction of 7.4 miles of track between Farmingdale and Central Islip. The project will eliminate current LIRR operational limitations and increases service reliability and on- time performance along the main line. All work was done within the right of way, including clearing and grubbing, excavation and backfill, construction of infiltration trenches, construction of retaining walls to support the future second track (cut walls and fill walls), placing of subgrade and sub ballast, installation of fences, rebuilding four crossings, relocation of an existing pedestrian bridge and wetland mitigationat the adjacent park.
JPCL worked as the prime for providing all 3rd party special inspections and material testing services for soil compaction, sub ballast and ballast placement, lab analyses, gradation and proctor determination. In addition, JPCL performed re-bar and concrete placement inspections including concrete strength testing in the lab. JPCL also provided sampling and chemical analyses of the excavated soil for reuse and disposal as a contaminated non-hazardous soil. This project was a fast paced project and JPCL, ensured code compliance and timely completion of all required inspections.