Challenge: Since 2010, GZA has performed investigation and post remedial action monitoring on behalf of the New Hampshire Department of Environmental Services (NHDES) at the New Hampshire Plating Company (NHPC) Superfund Site on the bank of the Merrimack River. NHPC had operated an electroplating facility there from 1962-1985 resulting in groundwater contamination that... more
Challenge: Firmenich retained GZA to complete a large-scale ecological restoration project on its active industrial property adjacent to Newark Bay, an area impacted by a long history of industrial use. The fragrance manufacturer was eager to re-establish a robust ecosystem supporting pollinators, migrating songbirds, raptors, small mammals and northern diamondback... more
Challenge: The client’s proposed 150-acre, mixed-use development is adjacent to an industrial site at which plastics and coatings were used. The adjacent site has been identified by the state as a source of per- and poly fluoroalkyl substances (PFAS) contamination contributing to soil and groundwater impacts. Because PFAS have been identified as a potential hazardous... more
Challenge: Emery & Garrett Groundwater Investigations, a division of GZA (EGGI/GZA), has provided groundwater consulting services to a former military base for 15 years as part of the base’s redevelopment. The mixed-use development proposed for the site will be exclusively reliant upon groundwater resources to meet its current and anticipated potable water supply... more
TransCanada, owner and operator 17 FERC-regulated hydropower dams in New England, asked GZA to provide dam engineering and resiliency consulting services to protect these critical sites. CHALLENGE Emergency Action Plan (EAP) updates were required for each of TransCanada’s 17 hydropower dams to conform with 2015 updates in the FERC Engineering Guidelines for the Evaluation... more
GZA’s forensic engineering to determine the causal mechanisms associated with Superstorm Sandy flood impacts at a critical New York City structure was integral to the building owner’s insurance recovery efforts. CHALLENGE   GZA was retained by the owner’s legal counsel to conduct forensic engineering that would determine the sequence of flooding caused by Superstorm Sandy... more
On November 22, 2016, more than 40 government officials, engineers, scientists, civic planners, non-profit leaders, and finance professionals gathered at the Metro Boston office of GZA, an engineering and applied science firm with expertise in climate change resilience and adaptation planning and design. GZA sponsored the New England Environmental Business Council (EBC)... more
GZA GeoEnvironmental, Inc. (GZA) recently completed design/build  project for a new industrial wastewater treatment system (WWTS) to pretreat metal finishing and metal working industrial wastewaters generated at GE Aviation’s jet engine components manufacturing campus in Hooksett, New Hampshire.  The system was designed to improve the performance, capacity, and operating... more
The Award-Winning OneNYC Retail Waterfront project entailed revitalization of an historic solid-waste landfill on a blighted, 10.6 acre peninsula in Lower New York Bay into an appealing retail center, waterfront esplanade and park with a spectacular view of the Verrazano Narrows Bridge.  The project included restoration of eroded shoreline, peninsula stabilization,... more
The Village of Woodridge and the Woodridge Park District planned to redevelop a strip mall, adjacent to a park, into an Athletic Recreational Center. Huff & Huff (H&H), a subsidiary of GZA was tasked with remediating the site on a tight timeline to keep construction on schedule. H&H utilized its license from NASA for Emulsified Zero-Valent Iron, or EZVI, to... more
New England East-West Solution (NEEWS) is comprised of multiple related high voltage electric transmission projects designed to provide stronger interconnections across Massachusetts, Rhode Island and Connecticut and allow more power to be moved between east and west in New England. National Grid is responsible for the design and construction of those portions of NEEWS,... more
GZA was the geotechnical engineer for the Block Island Wind Farm, which was the first offshore U.S. wind farm. The project consisted of 5 wind turbines located within Rhode Island state waters approximately 3 miles southeast of Block Island, Rhode Island.  The wind turbines will be constructed upon a jacket foundation anchored with steel pipe piles. In the Fall of 2008,... more
GZA served as geotechnical engineer for the design-build team to reconstruct Veteran’s Memorial Bridge, which crosses the Fore River between Portland and South Portland, Maine for the Maine Department of Transportation (Maine DOT). The new bridge will replace a deteriorated, 200-foot long circa-1950 steel bridge with a trapezoidal-box, segmental precast concrete structure... more
Huff & Huff, a subsidiary of GZA, based in Oak Brook, Illinois, was part of the team that recently completed this award-winning, sustainable, first of its kind interchange project for The Illinois Tollway. The Project Team was tasked with the unique challenge of developing a “green” interchange so that a variety of sustainable concepts could be evaluated for... more
GZA GeoEnvironmental, Inc. (GZA) was retained to perform design and demolition activities associated with the complete demolition and removal of an existing 21,000-square-foot industrial building, 9,500-square-foot industrial building, and six multi-family apartment buildings in Dorchester, Massachusetts. The work was performed on a firm fixed price basis with an... more
The Maine Turnpike Authority completed the 5-year, $135 million widening and modernization of the southern end of the Maine Turnpike/Interstate 95.  The project entailed adding a third travel lane and wider shoulders along 30 miles of interstate highway; reconstructing one interchange; reconstructing 18 bridges (Turnpike underpasses) to accommodate the additional width of... more
GZA's Chicago subsidiary, Huff & Huff (H&H), assisted Citgo with design and installation of rain gardens for stormwater management, which is consistent with the National Pollutant Discharge Elimination System (NPDES) Stormwater Permit requirements.  Prior to rain garden design, a feasibility analysis was completed, which estimated the runoff volume from the... more
GZA has worked at numerous airports in New England on stormwater permitting related projects.  GZA has prepared and peer reviewed SWPPPs under the NPDES MSGP program for many airports including Martha’s Vineyard Airport, Beverly Municipal Airport, Mansfield Airport, Westfield Barnes Airport, New Bedford Regional Airport, Taunton Municipal Airport, and Orange Municipal... more
GZA worked with the Connecticut Department of Transportation (CT DOT) to prepare an Environmental Impact Statement for the 32-mile Interstate 84 Corridor from Waterbury, CT to the New York State Line in conformance with NEPA and CEPA requirements.  GZA interfaced directly with DEEP, USACE, EPA and FWS in preparing Least Environmentally Damaging Practicable Alternative (... more
GZA, working as a subconsultant, was contracted by the New York City Economic Development Corporation (NYCEDC) on several elements of the demolition of Yankee Stadium, the construction of the new stadium, and the environmental analysis and permitting for the development of new riverfront parkland.  The Bronx Terminal Market Park was an important environmental mitigation... more
Since 2002, GZA has been performing an on-going, annual Invasive Aquatic Control Plan for the Springfield Parks & Recreation Department in 6 lakes and ponds.  Services included: Annual Aquatic Plant Survey Evaluation & Design of Alternative Control Methods to Maintain Desirable Aquatic Plants in Littoral Zone Environmental Permitting Annual Monitoring of Herbicide... more
GZA was contracted by a golf course Owner who was hit with enforcement actions by state and federal agencies after off-site sediment discharges and complaints by a neighboring property owner resulted in inspections onsite and the determination that the Owner had numerous Wetlands Protection Act and Clean Water Act violations.  Violations included the unauthorized filling... more
GZA worked with the Connecticut Department of Transportation to prepare an Environmental Impact Statement for the 32-mile Interstate 84 Corridor from Waterbury, CT to the New York State Line in conformance with NEPA and CEPA requirements.  GZA assessed existing conditions and impacts to wetlands, watercourses, rare species, contaminated sites, and prime farmlands over... more
GZA performed the environmental evaluations under CEQR relative to the Master Plan improvements for the 160 acre Fort Washington Park located along the Hudson River, under the George Washington Bridge.  As part of these studies, GZA environmental scientists completed botanical surveys for invasive species and normal flora within the parkland, as well as assess wildlife... more
GZA provided engineering, permitting and construction support services to the Town of Marshfield for the Bass Creek Restoration Project.  The project consisted of the removal of invasive vegetation (Phragmites australis) and dredging of approximately 1,500 CY of sediments to help alleviate flooding, remove invasive species, and improve tidal flushing, water quality and... more
As part of a Conservation & Management Permit for a runway extension project at Turners Falls Airport, GZA conducted rare species surveys for grasshopper sparrow, box turtle and several plant and lepidoptera species. Working with Gale Associates, GZA then used the results of those surveys to provide the basis for permitting and mitigation planning for the airport. ... more
Historically, jet fuel spills, and leaks in storage tanks and/or underground distribution systems resulted in frequent discharges of petroleum to tidal creeks of the Wood Island Marsh from the North Outfall at Logan Airport.  Those discharges resulted in the accumulation of visible oil in surficial sediment over an area of approximately 3.5 acres of the tidal creeks and... more
In late August 2010, GZA responded within one day to the site to make an initial assessment and recommendations for emergency response to a roadway embankment that had experienced a rotational slope movement during construction activities.  GZA supported the Maine DOT team in assessing stabilization activities to protect an adjacent house threatened by the movement and to... more
When the Resident Engineer noted that the widened roadway would be in close proximity to the existing rock cut slopes, GZA was called in to visit the site and made the preliminary assessment that several slopes presented a risk of rock fall to the new travelway. GZA mobilized a two-person crew for a total of 23 days of field mapping from the ground surface and on a ladder... more
The New NY Bridge (Tappan Zee Bridge Replacement) is a Design-Build project with the New York State Thruway Authority.  The project consists of the design and construction of two new 3-mile long multiple span structures that carry I-87/287 across the Hudson River between Rockland and Westchester Counties.  The twin bridges each include approximately 2 miles of approach... more
The Massachusetts Water Resources Authority (MWRA) owns numerous dams throughout the Commonwealth of Massachusetts.  MWRA engaged GZA to perform  breach analysis, develop inundation maps and develop Emergency Action Plans for the following structures: Chestnut Hill Reservoir Dam, Fells Reservoir Dam #6, #7 and #8, Spot Pond Dam No. 1, Spot Pond Dike #4 and #5. GZA used... more
The Challenge: GZA was retained to evaluate ground conditions and design the rock support system for the 34th Street cavern, the Tunnel Boring Machines (TBMs) and three access shafts. During construction, GZA performed geologic mapping and observed installation of ground support for compliance with the design drawings. GZA also provided geotechnical and structural... more
GZA evaluated flood hazards at 23 U.S. nuclear power plants after a directive was issued to the nuclear power industry by the U.S. Nuclear Regulatory Commission (NRC), prompted by the 2011 earthquake and tsunami that triggered a nuclear accident at the Fukushima, Japan plant. CHALLENGE The NRC issued a three-year deadline by which all U.S. nuclear plants were required to... more
The Challenge: While managing the demolition of a former industrial facility that manufactured liquid, granulated and powdered sodium silicate products, GZA was engaged as an owner’s agent to manage the repair and replacement of siding on a separate manufacturing facility located at the same site. Activities in that building, which remained operational, could not be... more
The Challenge: Ecological constraints required seven environmental permits in order to provide vital improvements for an airport abutting the Massachusetts coastline. The runways were surrounded by wetlands and rivers, and supported various rare species. A Wetlands Restriction Order existed at the airport, impeding future development. Our Solution: Creative wetland and... more
GZA provided engineering services for the rehabilitation of the waterfront facilities for a 3,160-acre multimodal industrial and commercial business park located within a prominent and active bay. At 250-feet wide and 1200-feet long, the former Navy Pier constructed in the early 1950’s is currently used for berthing Roll on/Roll off vehicle transport vessels and as a... more
This project started in 2004 with design and construction phase services for a two level precast concrete garage at Concord Hospital in Concord, NH.  This original Lot F parking structure was built in 2005 and offered space for up to 470 vehicles.  In 2008 a third level to the garage was designed but not built. In 2013 GZA was asked by Concord Hospital to update the 2008... more
The Chelsea Street Bridge was originally built in 1936.  It crosses Chelsea Creek and connects East Boston in Suffolk County with Chelsea in Middlesex County via Chelsea Street.  The Bridge is a rare Strauss heel trunnion type Bascule Bridge.  The Bridge has had many repairs over the years.  The latest repairs being done in the mid-1990s. The riveted steel frame Chelsea... more
As part of the FERC Potential Failure Mode Analysis (PFMA) process at a large gravity dam associated with a hydropower project, the project Owner identified potential for dissolution of gypsum from the dam foundation.  The uplift control system at the dam includes a line of relief wells which collect seepage from the foundation and discharge it into an internal gallery. ... more
Since 2007, under an existing Task Order Contract with The Metropolitan District (Hartford, CT), GZA has been conducting detailed dam safety inspections and engineering evaluations for the Nepaug Reservoir Dams. This work has included the Nepaug Reservoir Dams situated in New Hartford, Canton and Burlington, CT and is comprised of Nepaug Dam, a 156-foot-high (max), 650-ft... more
  The New York City Department of Environmental Protection (NYCDEP) - Bureau of Water Supply, Quality and Protection engaged GZA GeoEnvironmental of New York (GZANY) to provide engineering consulting services for its Detailed Study/Investigation for the Catskill and Delaware System Dams. The focus of this $4.3 million engineering contract, with design and oversight of a $... more
GZA was retained by the Town of Hamburg to evaluate the Town’s existing closed landfill and develop a remedial design for the 11-acre landfill. The landfill was identified by the New York State Department of Environmental Conservation (NYSDEC) to have waste protruding through the existing cap, leachate outbreaks, and have flat top slopes inhibiting stormwater runoff from... more
GZA was retained by one of the largest Cogeneration facilities in the world to evaluate planned changes to the combined cycle natural gas fired turbines with respect to the federal New Source Review (NSR) program requirements as well as State-specific requirements.  GZA concluded that the changes would require review under the federal NSR/PSD program and prepared a permit... more
GZA GeoEnvironmental, Inc. (GZA) was selected through a competitive bid process from six consulting firms to provide geotechnical, environmental and hazardous building materials services for the Manchester Municipal Complex currently under construction.  The project involves the redevelopment of three parcels in the center of Manchester.  The parcels have experienced... more
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... more
GZA was able to assist the City of Woonsocket, Rhode Island obtain regulatory closure within 1 year for an impacted site using an innovative green bioremediation technology. Using federal Brownfield funding, Rhode Island Department of Education Grants, municipal bonds and former owner contributions, the City of Woonsocket purchased a former manufacturing site that had... more
  In addition to pursuing a LEED Gold rating, this 60,000 SF building is one of three demonstration projects for the Commonwealth of Massachusett’s Zero Net Energy Building (ZNEB) program. As such, the design incorporated energy efficiency strategies including a geothermal-based HVAC system. Fifty wells to a depth of 500 feet facilitate the thermal exchange with the earth... more
GZA provided engineering services for design of the proposed Second Avenue Subway along the east side of Manhattan. The project is approximately 8.5 miles long and extends from 125th Street to Hanover Square.  The new line includes sixteen new stations, renovation of an existing at 63rd Street and two tunnels.  A connection to the Broadway Line at 63rd Street will also be... more
During the last five years, GZA has provided a wide array of dam engineering services to the Massachusetts Department of Conservation and Recreation (DCR). GZA has assisted both the DCR Office of Dam Safety in its capacity as the agency charged with implementing state dam safety regulation and the DCR Dam Maintenance Program in its capacity as owner of more than 250 dams... more