GZA performed a State Environmental Quality Review Act (SEQRA) permit application for an 84-acre landfill expansion. The proposed expansion involves remediation/removal of long-existing industrial fill to allow landfilling operations for 15 to 20 years. Excavation of a former on-site hazardous waste treatment facility with disposal off-site at a permitted hazardous waste facility is one of the benefits of the project. The landfill expansion will effectively transform this industrial “Brownfield” into an aesthetically pleasing “Greenspace”. These positive aspects of the project allowed Allied to procure the expansion permit with little to no public opposition.
Our design removes about 2.2 million cubic yards of lime fill from the landfill expansion footprint and disposes of the lime back into the constructed cells. About 1 million cubic yards of lime is left in-place with the landfill cells partially constructed over the lime. The design has the surface of the lime left in-place to be graded at a steep slope (about 6 to 10 percent) to account for consolidation of the lime.
The landfill design met 6 NYCRR Part 360 regulations having a double-composite liner system consisting of a primary and secondary (drainage geocomposite) leachate collection systems and low permeability barriers covered with HDPE geomembranes.
GZA prepared contract bid documents to solicit and evaluate contractor proposals for construction of the initial phases, Subareas A & B, from 2006 through 2009. The bid documents quantified different on-site fill types for excavation and removal or use as subgrade construction material. Disposal of excavated lime into Allied’s active cell occurred concurrent with regular landfill disposal activities. Costs for constructing Subarea A came under budgeted costs and was done on schedule. Subarea C is currently being constructed in 2012 and 2013.
GZA developed 3-D electronic survey data for constructing these multi-layer, multi-planar landfill floors. This data is useful for bidding contractors, construction layout using GPS-guided heavy equipment for stake-less grading, and for estimating accurate earthwork volumes in an expedient manner.