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WP_Query Object ( [query] => Array ( [sector] => federal ) [query_vars] => Array ( [sector] => federal [error] => [m] => [p] => 0 [post_parent] => [subpost] => [subpost_id] => [attachment] => [attachment_id] => 0 [name] => [pagename] => [page_id] => 0 [second] => [minute] => [hour] => [day] => 0 [monthnum] => 0 [year] => 0 [w] => 0 [category_name] => [tag] => [cat] => [tag_id] => [author] => [author_name] => [feed] => [tb] => [paged] => 1 [meta_key] => [meta_value] => [preview] => [s] => [sentence] => [title] => [fields] => all [menu_order] => [embed] => [category__in] => Array ( ) [category__not_in] => Array ( ) [category__and] => Array ( ) [post__in] => Array ( ) [post__not_in] => Array ( ) [post_name__in] => Array ( ) [tag__in] => Array ( ) [tag__not_in] => Array ( ) [tag__and] => Array ( ) [tag_slug__in] => Array ( ) [tag_slug__and] => Array ( ) [post_parent__in] => Array ( ) [post_parent__not_in] => Array ( ) [author__in] => Array ( ) [author__not_in] => Array ( ) [search_columns] => Array ( ) [ignore_sticky_posts] => [suppress_filters] => [cache_results] => 1 [update_post_term_cache] => 1 [update_menu_item_cache] => [lazy_load_term_meta] => 1 [update_post_meta_cache] => 1 [post_type] => [posts_per_page] => 10 [nopaging] => [comments_per_page] => 5 [no_found_rows] => [taxonomy] => sector [term] => federal [order] => DESC ) [tax_query] => WP_Tax_Query Object ( [queries] => Array ( [0] => Array ( [taxonomy] => sector [terms] => Array ( [0] => federal ) [field] => slug [operator] => IN [include_children] => 1 ) ) [relation] => AND [table_aliases:protected] => Array ( [0] => ph_term_relationships ) [queried_terms] => Array ( [sector] => Array ( [terms] => Array ( [0] => federal ) [field] => slug ) ) [primary_table] => ph_posts [primary_id_column] => ID ) [meta_query] => WP_Meta_Query Object ( [queries] => Array ( ) [relation] => [meta_table] => [meta_id_column] => [primary_table] => [primary_id_column] => [table_aliases:protected] => Array ( ) [clauses:protected] => Array ( ) [has_or_relation:protected] => ) [date_query] => [queried_object] => WP_Term Object ( [term_id] => 1293 [name] => Federal [slug] => federal [term_group] => 0 [term_taxonomy_id] => 1293 [taxonomy] => sector [description] => [parent] => 0 [count] => 22 [filter] => raw [term_order] => 0 ) [queried_object_id] => 1293 [request] => SELECT SQL_CALC_FOUND_ROWS ph_posts.ID FROM ph_posts LEFT JOIN ph_term_relationships ON (ph_posts.ID = ph_term_relationships.object_id) WHERE 1=1 AND ( ph_term_relationships.term_taxonomy_id IN (1293) ) AND ((ph_posts.post_type = 'project' AND (ph_posts.post_status = 'publish' OR ph_posts.post_status = 'acf-disabled'))) GROUP BY ph_posts.ID ORDER BY ph_posts.menu_order, ph_posts.post_date DESC LIMIT 0, 10 [posts] => Array ( [0] => WP_Post Object ( [ID] => 19281 [post_author] => 1 [post_date] => 2026-02-05 19:57:58 [post_date_gmt] => 2026-02-05 19:57:58 [post_content] => The U.S. Army Corps of Engineers, New York District (USACE), in partnership with the New Jersey Department of Environmental Protection (NJDEP), conducted a comprehensive study to identify ecosystem restoration and flood-damage-reduction solutions for the Millstone River Basin in New Jersey. Project stakeholders included the U.S. Geological Survey, the USDA Natural Resources Conservation Service, Mercer and Middlesex Counties, Princeton University, and the Stony Brook–Millstone Watershed Association. During the study, Carnegie Lake, a freshwater impoundment of the Millstone River located in Mercer and Middlesex Counties, was identified as a significant natural resource within the watershed. As the project’s lead agency, USACE contracted Princeton Hydro to develop a detailed lake and watershed restoration plan for Carnegie Lake. The Carnegie Lake and Watershed Restoration Plan focused on three primary objectives. First, it involved collecting a wide range of site‑specific in‑lake and watershed data. Second, it quantified the hydrologic and non‑point‑source pollutant budgets for the lake, including total suspended solids and the nutrients nitrogen and phosphorus. Third, it used the findings from the first two objectives to develop a comprehensive lake and watershed restoration plan. The first objective was completed in 2003, during which extensive data were collected throughout the growing season. A major component of this effort was a detailed bathymetric survey that measured water depths and the volume of unconsolidated sediments. Additional tasks included collecting physical, chemical, and biological in‑lake data; conducting macrophyte and fisheries surveys; and collecting and analyzing baseline and stormwater samples. Hydrologic and pollutant budgets for Carnegie Lake and its watershed were then developed using standardized and widely accepted models calibrated with the collected baseline and stormwater data. These budgets informed water‑quality models used to predict in‑lake conditions under various climatic and pollutant‑loading scenarios. All water‑quality and watershed data, along with model results, were used to evaluate and prioritize feasible, cost‑effective in‑lake and watershed management techniques aimed at improving water quality and reducing pollutant loads. The project was finalized in March 2005. [gallery link="none" ids="19279,19277,19276"] [post_title] => Carnegie Lake Phase I Lake and Watershed Restoration Plan [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => carnegie-lake-phase-i-lake-and-watershed-restoration-plan [to_ping] => [pinged] => [post_modified] => 2026-04-08 16:26:56 [post_modified_gmt] => 2026-04-08 16:26:56 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=19281 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [1] => WP_Post Object ( [ID] => 18815 [post_author] => 1 [post_date] => 2025-12-08 21:44:59 [post_date_gmt] => 2025-12-08 21:44:59 [post_content] => Princeton Hydro was contracted by the United States Army Corps of Engineers (USACE) Philadelphia District to perform laboratory testing on vibracore samples collected as part of the State wide beach replenishment project. Vibracore samples were collected by the USACE Wilmington District vessel, Brandy Station, at existing and potential borrow areas located offshore near Cape May, Hereford to Townsends Inlet, Absecon Inlet, Long Beach Island, and Manasquan to Barnegat Inlet. Seventy-nine (79) total vibracore samples were collected, each extending approximately twenty (20) feet below the mudline at each location. Following the completion of the field investigation, the samples were collected directly from the Government vessel and delivered to Princeton Hydro’s AASHTO accredited and USACE validated soils laboratory for logging and materials testing. From the vibracores, a total of four-hundred and fifty (450) samples were selected for grain size analysis. A summary report was provided to USACE upon completion of the laboratory testing detailing the methodologies used for laboratory testing, results of the grain size analysis, detailed vibracore logs, and a summary of the soils observed in each of the retrieved vibracore samples. [post_title] => New Jersey Borrow Area Vibracores Subsurface Investigation [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => new-jersey-borrow-area-vibracores-subsurface-investigation [to_ping] => [pinged] => [post_modified] => 2025-12-08 21:44:59 [post_modified_gmt] => 2025-12-08 21:44:59 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=18815 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [2] => WP_Post Object ( [ID] => 18800 [post_author] => 1 [post_date] => 2025-12-02 20:22:29 [post_date_gmt] => 2025-12-02 20:22:29 [post_content] => The New Jersey Department of Military and Veteran Affairs (NJDMAVA) retained Princeton Hydro to implement ecological services at the Sea Girt National Guard Training Center in the Borough of Sea Girt, Monmouth County, New Jersey. To facilitate portions of the 2025-2029 Integrated Natural Resources Management Plan (INRMP), Princeton Hydro conducted a series of tasks such as delineating the extent of the northern and southern dune protection areas, where suitable habitat for the federally threatened, state endangered piping plover (Charadrius melodus) is present and confirming the extent of wetlands associated with a prior Letter of Interpretation. The project team also conducted an ecological assessment of the existing ecological communities with a focus on identifying the presence/extent/type of invasive species present to inform future targeted habitat management efforts identified within the INRMP and procured, on behalf of NJDMAVA, a Letter of Interpretation – Line Verification, Freshwater Wetlands General Permit 16 – Creation, restoration, and enhancement of habitat and water quality functions and values, and Coastal Zone Management General Permit 24 – Habitat creation, restoration, enhancement, and living shoreline activities. [gallery link="none" columns="2" size="large" ids="18801,18803"] [post_title] => Sea Girt Nation Guard Training Center Habitat Enhancement Project [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => sea-girt-nation-guard-training-center-habitat-enhancement-project [to_ping] => [pinged] => [post_modified] => 2025-12-08 21:44:33 [post_modified_gmt] => 2025-12-08 21:44:33 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=18800 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [3] => WP_Post Object ( [ID] => 16980 [post_author] => 1 [post_date] => 2025-01-30 15:01:20 [post_date_gmt] => 2025-01-30 15:01:20 [post_content] => Liberty State Park is located on the west bank of Upper New York Bay and is one of the most visited state parks in the nation with over 5.1 million visitors in 2018. Princeton Hydro was contracted to design a resilient coastal ecosystem within 235 acres of this highly urbanized setting that provides both ecological and social benefits. This includes the restoration of over 80 acres of tidal and non-tidal wetlands and creation of several thousands of feet of intertidal shoreline and shallow water habitat hydrologically connected to the Upper New York Bay. Historically, the site contained intertidal mudflats and shallow water habitat, which were filled and developed as a railroad yard. Once constructed, this project will expand public access, improve water quality, restore native plant communities, and improve coastal resiliency for urban communities that are vulnerable to storm events. The site design includes a trail network for the park interior that will provide access to the newly established habitat zones and views of the Statue of Liberty and New York City skyline. This trail network will enhance pedestrian connectivity between the existing portion of Liberty State Park, Liberty Science Center, Jersey City, and local public transit hubs. To inform the design development, our team conducted design charrettes with various stakeholders and a myriad of monitoring tasks focused on site characterization including a wetland delineation; bio-benchmarking surveys of the tidal marsh vegetation communities; topographic, bathymetric, and utility surveys; and geotechnical sampling such as SPT borings and test pits. Field data and observations were incorporated into various analyses to support the engineering design including a 2D Hydrologic and Hydraulic model and wave analysis, and a detailed Sea Level Rise Analysis to inform the design of various project elements to accommodate sea level rise projections through 2070. The tidal channel geometry, culvert width, and tidal marsh were designed to address increased flows and water surface elevations. Groundwater levels and flow direction were also characterized through the installation of monitoring wells and continuous measurements of the groundwater level using piezometers. To support the design process, the team developed interim construction cost estimates for various design milestones and coordinated and advanced the local, state, and federal permit process and applications. As part of NJDEP’s public outreach campaign, our team participated in an open house interacting directly with members of the public. We produced a 4-minute video simulating the expected visitor experience using detailed engineering design renderings. When completed, this will be one of the largest ecosystem habitat restoration projects in New Jersey. Click below to watch the video now: [embed]https://youtu.be/XbzQ08o7b5Y[/embed] [post_title] => Liberty State Park Ecosystem Restoration [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => liberty-state-park-ecosystem-restoration [to_ping] => [pinged] => [post_modified] => 2025-01-30 16:01:12 [post_modified_gmt] => 2025-01-30 16:01:12 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=16980 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [4] => WP_Post Object ( [ID] => 15996 [post_author] => 1 [post_date] => 2024-12-02 15:28:32 [post_date_gmt] => 2024-12-02 15:28:32 [post_content] => The Spring Creek (North) Ecosystem Restoration Project is located in the boroughs of Brooklyn and Queens, New York. In the early 1900’s, the salt marsh community of Spring Creek was part of the extensive coastal wetland community of Jamaica Bay, known for the abundance and diversity of its shellfish as well as its ecological importance as a nursery and feeding ground for countless species of birds and fish. The intertidal salt marsh and uplands have since been degraded by historic placement of dredged spoils and municipal waste, the construction of a sanitary sewer trunk line, ditching of the marsh, and urbanization of the watershed. When completed, the project will restore approximately 43.2 acres of degraded habitat to 0.7 acres of low marsh, 12.9 acres of transitional and high marsh, 5.2 acres of scrub shrub wetland and 24.4 acres of maritime upland in an overall project footprint of 67 acres. Primary construction activities will include excavating and re-contouring uplands to intertidal elevations, thin layer placement of sand on the marsh platform to restore areas of degraded tidal wetland, removing invasive plant species, and replanting with native plant species. The overall project purpose is to improve the environmental quality (water, diversity, and wildlife habitat) of Spring Creek and its associated salt marshes as part of the overall Jamaica Bay Ecosystem. [gallery link="none" ids="15997,15998,16000"] Princeton Hydro was contracted by the US Army Corps of Engineers, New York District to lead the design and engineering. To inform the design development, a variety of site-specific data was collected including topographic, bathymetric, utility and tree surveys. Wetland delineation and vegetation characterization were performed, along with a bio-benchmark survey to establish marsh habitat boundaries; hydrodynamic data; and geotechnical borings. The data collected was analyzed and incorporated into the design, including a sea level change analysis; slope stability analysis; development of a hydrologic model and an unsteady 1-D hydraulic model; stormwater design; and wetland restoration design. A concept design was developed in coordination with the US Army Corps of Engineers and New York City Parks, and the design was advanced via the preparation of 30%, 60%, 90%, and 100% design plans and technical specifications. Additionally, the required local, state, and federal permits were obtained, and a detailed construction cost estimate was developed. [post_title] => Spring Creek North Ecosystem Restoration Project [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => spring-creek-north-ecosystem-restoration-project [to_ping] => [pinged] => [post_modified] => 2024-12-02 15:29:53 [post_modified_gmt] => 2024-12-02 15:29:53 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=15996 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [5] => WP_Post Object ( [ID] => 15954 [post_author] => 1 [post_date] => 2024-11-08 19:07:55 [post_date_gmt] => 2024-11-08 19:07:55 [post_content] => The New Jersey Back Bay (NJBB) Coastal Storm Risk Management (CSRM) feasibility study is focused on the approximately 100 miles of interconnected tidal water bodies and coastal lakes located landward of the New Jersey Ocean coastline from the Manasquan Inlet to the Cape May Inlet. These areas were subject to recent flooding, storm surge, and damages as a result of Hurricane Sandy and other storm events. As part of this study, the United States Army Corps of Engineers (USACE) Philadelphia District developed a preliminary alignment for a storm surge barrier located in Great Egg Harbor Inlet in Atlantic and Cape May Counties. This preliminary barrier would serve as the representative design for all planned storm surge barriers as part of the project. Through an existing contract with USACE Philadelphia District, Princeton Hydro was tasked with performing a water-based subsurface exploration along the preliminary barrier alignment. This exploration consisted of nine (9) Cone Penetration Tests (CPTs) with continuous pore pressure measurements to a maximum depth of 150 ft below the mudline or until refusal was encountered. To perform the testing, Princeton Hydro required subcontracted services provided by Northstar Marine Services, Inc., ConeTec, and Boring Brothers, Inc. CPT soundings were performed from Northstar Marine Services’ 70 ft Lift Boat, the Vision. A rubber track mounted, low- clearance drill rig was provided by Boring Brothers, Inc. to socket casings into the mudline by way of the moon pool of the barge. Once casings were set, ConeTec utilized their Direct Push Overwater Ramset to continuously advance the CPT soundings to the termination depth. During the entire operation, Princeton Hydro provided continuous oversight as well as regular Health and Safety Inspections. The information collected during the investigation was provided to USACE for use in the design of the storm surge barrier. [gallery columns="2" link="none" size="medium" ids="15956,15955"] [post_title] => NJ Back Bays Coastal Storm Risk Management Feasibility Study & Subsurface Exploration [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => nj-back-bays-coastal-storm-risk-management-feasibility-study-subsurface-exploration [to_ping] => [pinged] => [post_modified] => 2024-11-08 19:08:12 [post_modified_gmt] => 2024-11-08 19:08:12 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=15954 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [6] => WP_Post Object ( [ID] => 14826 [post_author] => 1 [post_date] => 2024-04-18 14:55:52 [post_date_gmt] => 2024-04-18 14:55:52 [post_content] => Connecticut Fund for the Environment (FE) and Save the Sound (STS), in partnership with USFWS and CTDEEP Inland Fisheries Division, secured federal funding to remove the Hyde Pond Dam, restoring Whitford Brook, the primary in-flowing stream to the Mystic River estuary, to a natural free-flowing condition. This created unobstructed fish passage from Mystic River up through the project site, and removed a threat to public safety. The existing dam was an earthen embankment with a concrete capped masonry spillway 4.8 feet high that created a 12-acre impoundment. A fishway installed at the dam by CT DEEP to support a regionally-important river herring run and sea-run brook trout fishery was known to be ineffective due to its outlet location, beaver interference, and frequent low flows due to leakage through the dam. The dam removal restored fish passage to 4.1 miles of stream and provide access for alewife, blueback herring, American eel, American shad, and sea-run brook trout. [gallery link="none" size="medium" ids="14819,14821,14820"] Princeton Hydro confirmed through impoundment probing and bathymetric survey that the impoundment contained significant quantities of impounded sediments that had become densely vegetated as scrub-shrub vegetation. Sediment management and wetland impacts became driving factors in the project design and regulatory process. Princeton Hydro coordinated with CT DEEP Planning and Standards Division to develop and approve a sediment sampling plan that included multiple samples throughout the site as well as downstream and upstream. Results indicated some elevated contaminant levels in some areas. Princeton Hydro developed a sediment management plan and construction sequence, informed by the sediment analysis that balanced active sediment management and passive river restoration. The design entailed excavation of a portion of the sediment prone to mobilization that was then replaced, stabilized, and vegetated on-site. Princeton Hydro coordinated closely with CFE/STS to negotiate with US Army Corps of Engineers and CT DEEP regulatory divisions to minimize impacts to wetland resources as much as practicable, protect downstream water quality, restore river and riparian functions to the site, and stay within grant cost limits. RiverLogic Solutions provided construction services, and Princeton Hydro provided construction supervision to remove the dam within budget and on schedule in 2015. Since removal, the site has undergone a gradual transition in vegetation but remains a vibrant stream-floodplain wetland complex. [gallery link="none" ids="14824,14823,14825"] [post_title] => Hyde Pond Dam Removal [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => hyde-pond-dam-removal [to_ping] => [pinged] => [post_modified] => 2024-04-18 15:07:19 [post_modified_gmt] => 2024-04-18 15:07:19 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=14826 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [7] => WP_Post Object ( [ID] => 14431 [post_author] => 1 [post_date] => 2024-01-17 15:02:39 [post_date_gmt] => 2024-01-17 15:02:39 [post_content] => Princeton Hydro was contracted by the US Army Corps of Engineers (USACE), New York District to perform a Dam Engineering Assessment for the Lower Cragston Dam at West Point. The multidisciplinary approach to this engineering assessment consists of: Geotechnical and Geophysical Investigation & Reporting; Bathymetric and Topographic Survey; Hydrologic & Hydraulic Analysis; Structural Analysis; Seepage and Stability Analysis; and Dam Break Analysis. In order to successfully and safely perform geotechnical soil borings and rock coring within the dam embankment, a Drilling Program Plan (DPP) was developed by Princeton Hydro. In order to develop a proper drilling scope and methodology, a thorough review of existing documentation was performed including historic engineering plans, dam inspection reports, and Emergency Action Plan. The DPP also required a comprehensive understanding of bedrock and surficial geologic formations in the area. A risk analysis was also performed and the DPP was ultimately approved by the USACE Dam Safety Officer and executed successfully in the field. Laboratory soil testing was performed at Princeton Hydro’s AASHTO-accredited and USACE-validated soil laboratory. Ultimately, the geotechnical investigation and subsequent soil analysis was used to inform a slope stability and seepage analysis. The geotechnical analyses, H&H study, structural inspection, bathymetry, and dam break analysis were used to provide USACE, and in turn, West Point, with recommendations for repair options, replacement options, and decommissioning options for the dam. [gallery link="none" size="medium" columns="2" ids="14432,14433"] [post_title] => USACE Lower Cragston Dam Engineering Assessment [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => usace-lower-cragston-dam-engineering-assessment [to_ping] => [pinged] => [post_modified] => 2024-01-31 16:34:59 [post_modified_gmt] => 2024-01-31 16:34:59 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=14431 [menu_order] => 0 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [8] => WP_Post Object ( [ID] => 13279 [post_author] => 1 [post_date] => 2023-07-21 18:25:25 [post_date_gmt] => 2023-07-21 18:25:25 [post_content] => Princeton Hydro was contracted by the United States Army Corps of Engineers (USACE) Philadelphia District to perform a geotechnical evaluation in support of the proposed site improvements at the Letterkenny Army Depot in Chambersburg, Pennsylvania. The base focuses on the maintenance, modification, storage, and demilitarization of equipment for the United States Army. The base consists of numerous buildings/warehouses and parking/storage lots for military equipment spanning over 18,000 acres. The area in which the site work was conducted is approximately 10 acres in size and is the proposed area for a new consolidated Shipping and Receiving Warehouse for receipt of items and component materials being inducted into the depot for recapitalization or reset. For this field investigation project, Princeton Hydro was tasked with coordination and oversight of a Geophysical survey of the project area to identify, delineate, and characterize subsurface targets; performance of fourteen (14) geotechnical borings with associated rock coring to supplement USACE design of the site improvements; and performance of three (3) test pits to determine the depth to groundwater/seasonal high groundwater as well as the rippability of the bedrock on site. For the geophysical survey, Princeton Hydro subcontracted Hager-Richter Geoscience. This survey included ground penetrating radar (GPR), time domain electromagnetic induction metal detection (EM61), and precision utility location. During the geophysical survey, Princeton Hydro was on site to act as a point of contact with the client as well as the Site Safety and Health Officer as outlined in USACE EM 385-1-1. For the geotechnical borings and test pits, Princeton Hydro subcontracted CGC Geoservices. Borings were completed by way of a CME-55 truck mounted drill rig. In each boring advanced, sampling was performed continuously until the target depth was achieved. If bedrock was encountered before each target depth, rock coring was performed until a minimum of 10 feet of recovered core sample was observed to be competent rock. Test pits were completed by way of a John Deere 310L EP rubber tire backhoe. Test pits were advanced to bedrock, at which time the backhoe would attempt to progress until bucket refusal to determine the rippability of the rock. Princeton Hydro was on site during all geotechnical borings and test pits to prepare descriptive boing/test pit logs as well as act as the Site Safety and Health Officer as outlined in USACE EM 385-1-1. Upon completion of the field investigation, Princeton Hydro performed laboratory testing on select soil sampling representative of the stratigraphy observed at the site in our in-house AASHTO-accredited and USACE-validated materials testing laboratory. The results of the lab testing were utilized to establish subsurface strata to aid USACE with the design of the proposed site features. [post_title] => Letterkenney Army Depot Site Investigation [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => letterkenney-army-depot-site-investigation [to_ping] => [pinged] => [post_modified] => 2024-10-03 12:25:23 [post_modified_gmt] => 2024-10-03 12:25:23 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=13279 [menu_order] => 7 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) [9] => WP_Post Object ( [ID] => 12290 [post_author] => 1 [post_date] => 2023-02-14 18:59:08 [post_date_gmt] => 2023-02-14 18:59:08 [post_content] => In 2006, The United States Army Corps of Engineers, New York District (USACE) subcontracted Princeton Hydro, LLC and Monmouth University to perform a Microbial Source Tracking study (MST) of the Bronx River watershed by using Antibiotic Resistance Analysis (ARA). The watershed includes nearly 1.8 million people and encompasses 36,096 acres in 13 municipalities of Westchester County. Princeton Hydro partnered with Monmouth University to perform the following tasks: • Spring, summer and fall pathogen surveys • Validation of the Monmouth County ARA database • Creation of a Bronx River ARA Database • Evaluation of land uses and analytical data for pathogens and nutrient loading • Evaluation of stormwater management problem areas • Best Management Practices (BMP) recommendations While geese, pets, and horses contribute to the bacteria counts in the Bronx River, the impacts from 1.8 million people are a likely dominant source. This population also relies upon aging infrastructure and combined conveyance systems for stormwater and wastewater that were built in 1900. This infrastructure is undersized, fraught with leaks, and is subject to breaks, illicit connections, direct discharges, and combined sewer outfalls. Stormwater management in the watershed consists mainly of street drains and storm sewer connections to the river and its tributaries, with little or no retention. Potential BMPs recommended for the Bronx River included source control via some of the following: • Regulatory Activities • Redevelopment and Green Building • Stormwater Management BMPs • Infrastructure Remediation Water quality improvement recommendations included addressing illicit connection problems and reducing stormwater loading of bacteria. These recommendations were designed in concert with the project partners and looked for real world, achievable solutions towards river improvement. [post_title] => USACE Microbial Source Tracking of the Bronx River Watershed [post_excerpt] => [post_status] => publish [comment_status] => closed [ping_status] => closed [post_password] => [post_name] => usace-microbial-source-tracking-of-the-bronx-river-watershed [to_ping] => [pinged] => [post_modified] => 2023-02-14 18:59:08 [post_modified_gmt] => 2023-02-14 18:59:08 [post_content_filtered] => [post_parent] => 0 [guid] => https://princetonhydro.com/?post_type=project&p=12290 [menu_order] => 26 [post_type] => project [post_mime_type] => [comment_count] => 0 [filter] => raw ) ) [post_count] => 10 [current_post] => -1 [before_loop] => 1 [in_the_loop] => [post] => WP_Post Object ( [ID] => 19281 [post_author] => 1 [post_date] => 2026-02-05 19:57:58 [post_date_gmt] => 2026-02-05 19:57:58 [post_content] => The U.S. Army Corps of Engineers, New York District (USACE), in partnership with the New Jersey Department of Environmental Protection (NJDEP), conducted a comprehensive study to identify ecosystem restoration and flood-damage-reduction solutions for the Millstone River Basin in New Jersey. Project stakeholders included the U.S. Geological Survey, the USDA Natural Resources Conservation Service, Mercer and Middlesex Counties, Princeton University, and the Stony Brook–Millstone Watershed Association. During the study, Carnegie Lake, a freshwater impoundment of the Millstone River located in Mercer and Middlesex Counties, was identified as a significant natural resource within the watershed. As the project’s lead agency, USACE contracted Princeton Hydro to develop a detailed lake and watershed restoration plan for Carnegie Lake. The Carnegie Lake and Watershed Restoration Plan focused on three primary objectives. First, it involved collecting a wide range of site‑specific in‑lake and watershed data. Second, it quantified the hydrologic and non‑point‑source pollutant budgets for the lake, including total suspended solids and the nutrients nitrogen and phosphorus. Third, it used the findings from the first two objectives to develop a comprehensive lake and watershed restoration plan. The first objective was completed in 2003, during which extensive data were collected throughout the growing season. A major component of this effort was a detailed bathymetric survey that measured water depths and the volume of unconsolidated sediments. Additional tasks included collecting physical, chemical, and biological in‑lake data; conducting macrophyte and fisheries surveys; and collecting and analyzing baseline and stormwater samples. Hydrologic and pollutant budgets for Carnegie Lake and its watershed were then developed using standardized and widely accepted models calibrated with the collected baseline and stormwater data. These budgets informed water‑quality models used to predict in‑lake conditions under various climatic and pollutant‑loading scenarios. All water‑quality and watershed data, along with model results, were used to evaluate and prioritize feasible, cost‑effective in‑lake and watershed management techniques aimed at improving water quality and reducing pollutant loads. The project was finalized in March 2005. 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The U.S. Army Corps of Engineers, New York District (USACE), in partnership with the New Jersey Department of Environmental Protection (NJDEP), conducted a comprehensive study to identify ecosystem restoration and flood-damage-reduction solutions for the Millstone River Basin in New Jersey. Project stakeholders included the U.S. Geological Survey, the USDA Natural Resources Conservation Service, Mercer and Middlesex Counties, Princeton University, and the Stony Brook–Millstone Watershed Association.
During the study, Carnegie Lake, a freshwater impoundment of the Millstone River located in Mercer and Middlesex Counties, was identified as a significant natural resource within the watershed. As the project’s lead agency, USACE contracted Princeton Hydro to develop a detailed lake and watershed restoration plan for Carnegie Lake.
The Carnegie Lake and Watershed Restoration Plan focused on three primary objectives. First, it involved collecting a wide range of site‑specific in‑lake and watershed data. Second, it quantified the hydrologic and non‑point‑source pollutant budgets for the lake, including total suspended solids and the nutrients nitrogen and phosphorus. Third, it used the findings from the first two objectives to develop a comprehensive lake and watershed restoration plan.
The first objective was completed in 2003, during which extensive data were collected throughout the growing season. A major component of this effort was a detailed bathymetric survey that measured water depths and the volume of unconsolidated sediments. Additional tasks included collecting physical, chemical, and biological in‑lake data; conducting macrophyte and fisheries surveys; and collecting and analyzing baseline and stormwater samples.
Hydrologic and pollutant budgets for Carnegie Lake and its watershed were then developed using standardized and widely accepted models calibrated with the collected baseline and stormwater data. These budgets informed water‑quality models used to predict in‑lake conditions under various climatic and pollutant‑loading scenarios. All water‑quality and watershed data, along with model results, were used to evaluate and prioritize feasible, cost‑effective in‑lake and watershed management techniques aimed at improving water quality and reducing pollutant loads.
The project was finalized in March 2005.
Princeton Hydro was contracted by the United States Army Corps of Engineers (USACE) Philadelphia District to perform laboratory testing on vibracore samples collected as part of the State wide beach replenishment project. Vibracore samples were collected by the USACE Wilmington District vessel, Brandy Station, at existing and potential borrow areas located offshore near Cape May, Hereford to Townsends Inlet, Absecon Inlet, Long Beach Island, and Manasquan to Barnegat Inlet. Seventy-nine (79) total vibracore samples were collected, each extending approximately twenty (20) feet below the mudline at each location.
Following the completion of the field investigation, the samples were collected directly from the Government vessel and delivered to Princeton Hydro’s AASHTO accredited and USACE validated soils laboratory for logging and materials testing. From the vibracores, a total of four-hundred and fifty (450) samples were selected for grain size analysis.
A summary report was provided to USACE upon completion of the laboratory testing detailing the methodologies used for laboratory testing, results of the grain size analysis, detailed vibracore logs, and a summary of the soils observed in each of the retrieved vibracore samples.
The New Jersey Department of Military and Veteran Affairs (NJDMAVA) retained Princeton Hydro to implement ecological services at the Sea Girt National Guard Training Center in the Borough of Sea Girt, Monmouth County, New Jersey. To facilitate portions of the 2025-2029 Integrated Natural Resources Management Plan (INRMP), Princeton Hydro conducted a series of tasks such as delineating the extent of the northern and southern dune protection areas, where suitable habitat for the federally threatened, state endangered piping plover (Charadrius melodus) is present and confirming the extent of wetlands associated with a prior Letter of Interpretation.
The project team also conducted an ecological assessment of the existing ecological communities with a focus on identifying the presence/extent/type of invasive species present to inform future targeted habitat management efforts identified within the INRMP and procured, on behalf of NJDMAVA, a Letter of Interpretation – Line Verification, Freshwater Wetlands General Permit 16 – Creation, restoration, and enhancement of habitat and water quality functions and values, and Coastal Zone Management General Permit 24 – Habitat creation, restoration, enhancement, and living shoreline activities.
Liberty State Park is located on the west bank of Upper New York Bay and is one of the most visited state parks in the nation with over 5.1 million visitors in 2018. Princeton Hydro was contracted to design a resilient coastal ecosystem within 235 acres of this highly urbanized setting that provides both ecological and social benefits. This includes the restoration of over 80 acres of tidal and non-tidal wetlands and creation of several thousands of feet of intertidal shoreline and shallow water habitat hydrologically connected to the Upper New York Bay.
Historically, the site contained intertidal mudflats and shallow water habitat, which were filled and developed as a railroad yard. Once constructed, this project will expand public access, improve water quality, restore native plant communities, and improve coastal resiliency for urban communities that are vulnerable to storm events. The site design includes a trail network for the park interior that will provide access to the newly established habitat zones and views of the Statue of Liberty and New York City skyline. This trail network will enhance pedestrian connectivity between the existing portion of Liberty State Park, Liberty Science Center, Jersey City, and local public transit hubs.
To inform the design development, our team conducted design charrettes with various stakeholders and a myriad of monitoring tasks focused on site characterization including a wetland delineation; bio-benchmarking surveys of the tidal marsh vegetation communities; topographic, bathymetric, and utility surveys; and geotechnical sampling such as SPT borings and test pits. Field data and observations were incorporated into various analyses to support the engineering design including a 2D Hydrologic and Hydraulic model and wave analysis, and a detailed Sea Level Rise Analysis to inform the design of various project elements to accommodate sea level rise projections through 2070. The tidal channel geometry, culvert width, and tidal marsh were designed to address increased flows and water surface elevations. Groundwater levels and flow direction were also characterized through the installation of monitoring wells and continuous measurements of the groundwater level using piezometers.
To support the design process, the team developed interim construction cost estimates for various design milestones and coordinated and advanced the local, state, and federal permit process and applications. As part of NJDEP’s public outreach campaign, our team participated in an open house interacting directly with members of the public. We produced a 4-minute video simulating the expected visitor experience using detailed engineering design renderings. When completed, this will be one of the largest ecosystem habitat restoration projects in New Jersey. Click below to watch the video now:
The Spring Creek (North) Ecosystem Restoration Project is located in the boroughs of Brooklyn and Queens, New York. In the early 1900’s, the salt marsh community of Spring Creek was part of the extensive coastal wetland community of Jamaica Bay, known for the abundance and diversity of its shellfish as well as its ecological importance as a nursery and feeding ground for countless species of birds and fish. The intertidal salt marsh and uplands have since been degraded by historic placement of dredged spoils and municipal waste, the construction of a sanitary sewer trunk line, ditching of the marsh, and urbanization of the watershed.
When completed, the project will restore approximately 43.2 acres of degraded habitat to 0.7 acres of low marsh, 12.9 acres of transitional and high marsh, 5.2 acres of scrub shrub wetland and 24.4 acres of maritime upland in an overall project footprint of 67 acres. Primary construction activities will include excavating and re-contouring uplands to intertidal elevations, thin layer placement of sand on the marsh platform to restore areas of degraded tidal wetland, removing invasive plant species, and replanting with native plant species. The overall project purpose is to improve the environmental quality (water, diversity, and wildlife habitat) of Spring Creek and its associated salt marshes as part of the overall Jamaica Bay Ecosystem.
Princeton Hydro was contracted by the US Army Corps of Engineers, New York District to lead the design and engineering. To inform the design development, a variety of site-specific data was collected including topographic, bathymetric, utility and tree surveys. Wetland delineation and vegetation characterization were performed, along with a bio-benchmark survey to establish marsh habitat boundaries; hydrodynamic data; and geotechnical borings. The data collected was analyzed and incorporated into the design, including a sea level change analysis; slope stability analysis; development of a hydrologic model and an unsteady 1-D hydraulic model; stormwater design; and wetland restoration design.
A concept design was developed in coordination with the US Army Corps of Engineers and New York City Parks, and the design was advanced via the preparation of 30%, 60%, 90%, and 100% design plans and technical specifications. Additionally, the required local, state, and federal permits were obtained, and a detailed construction cost estimate was developed.
The New Jersey Back Bay (NJBB) Coastal Storm Risk Management (CSRM) feasibility study is focused on the approximately 100 miles of interconnected tidal water bodies and coastal lakes located landward of the New Jersey Ocean coastline from the Manasquan Inlet to the Cape May Inlet. These areas were subject to recent flooding, storm surge, and damages as a result of Hurricane Sandy and other storm events. As part of this study, the United States Army Corps of Engineers (USACE) Philadelphia District developed a preliminary alignment for a storm surge barrier located in Great Egg Harbor Inlet in Atlantic and Cape May Counties. This preliminary barrier would serve as the representative design for all planned storm surge barriers as part of the project.
Through an existing contract with USACE Philadelphia District, Princeton Hydro was tasked with performing a water-based subsurface exploration along the preliminary barrier alignment. This exploration consisted of nine (9) Cone Penetration Tests (CPTs) with continuous pore pressure measurements to a maximum depth of 150 ft below the mudline or until refusal was encountered. To perform the testing, Princeton Hydro required subcontracted services provided by Northstar Marine Services, Inc., ConeTec, and Boring Brothers, Inc.
CPT soundings were performed from Northstar Marine Services’ 70 ft Lift Boat, the Vision. A rubber track mounted, low- clearance drill rig was provided by Boring Brothers, Inc. to socket casings into the mudline by way of the moon pool of the barge. Once casings were set, ConeTec utilized their Direct Push Overwater Ramset to continuously advance the CPT soundings to the termination depth. During the entire operation, Princeton Hydro provided continuous oversight as well as regular Health and Safety Inspections. The information collected during the investigation was provided to USACE for use in the design of the storm surge barrier.
Connecticut Fund for the Environment (FE) and Save the Sound (STS), in partnership with USFWS and CTDEEP Inland Fisheries Division, secured federal funding to remove the Hyde Pond Dam, restoring Whitford Brook, the primary in-flowing stream to the Mystic River estuary, to a natural free-flowing condition. This created unobstructed fish passage from Mystic River up through the project site, and removed a threat to public safety. The existing dam was an earthen embankment with a concrete capped masonry spillway 4.8 feet high that created a 12-acre impoundment. A fishway installed at the dam by CT DEEP to support a regionally-important river herring run and sea-run brook trout fishery was known to be ineffective due to its outlet location, beaver interference, and frequent low flows due to leakage through the dam. The dam removal restored fish passage to 4.1 miles of stream and provide access for alewife, blueback herring, American eel, American shad, and sea-run brook trout.
Princeton Hydro confirmed through impoundment probing and bathymetric survey that the impoundment contained significant quantities of impounded sediments that had become densely vegetated as scrub-shrub vegetation. Sediment management and wetland impacts became driving factors in the project design and regulatory process. Princeton Hydro coordinated with CT DEEP Planning and Standards Division to develop and approve a sediment sampling plan that included multiple samples throughout the site as well as downstream and upstream.
Results indicated some elevated contaminant levels in some areas. Princeton Hydro developed a sediment management plan and construction sequence, informed by the sediment analysis that balanced active sediment management and passive river restoration. The design entailed excavation of a portion of the sediment prone to mobilization that was then replaced, stabilized, and vegetated on-site.
Princeton Hydro coordinated closely with CFE/STS to negotiate with US Army Corps of Engineers and CT DEEP regulatory divisions to minimize impacts to wetland resources as much as practicable, protect downstream water quality, restore river and riparian functions to the site, and stay within grant cost limits. RiverLogic Solutions provided construction services, and Princeton Hydro provided construction supervision to remove the dam within budget and on schedule in 2015. Since removal, the site has undergone a gradual transition in vegetation but remains a vibrant stream-floodplain wetland complex.
Princeton Hydro was contracted by the US Army Corps of Engineers (USACE), New York District to perform a Dam Engineering Assessment for the Lower Cragston Dam at West Point. The multidisciplinary approach to this engineering assessment consists of: Geotechnical and Geophysical Investigation & Reporting; Bathymetric and Topographic Survey; Hydrologic & Hydraulic Analysis; Structural Analysis; Seepage and Stability Analysis; and Dam Break Analysis.
In order to successfully and safely perform geotechnical soil borings and rock coring within the dam embankment, a Drilling Program Plan (DPP) was developed by Princeton Hydro. In order to develop a proper drilling scope and methodology, a thorough review of existing documentation was performed including historic engineering plans, dam inspection reports, and Emergency Action Plan. The DPP also required a comprehensive understanding of bedrock and surficial geologic formations in the area. A risk analysis was also performed and the DPP was ultimately approved by the USACE Dam Safety Officer and executed successfully in the field.
Laboratory soil testing was performed at Princeton Hydro’s AASHTO-accredited and USACE-validated soil laboratory. Ultimately, the geotechnical investigation and subsequent soil analysis was used to inform a slope stability and seepage analysis.
The geotechnical analyses, H&H study, structural inspection, bathymetry, and dam break analysis were used to provide USACE, and in turn, West Point, with recommendations for repair options, replacement options, and decommissioning options for the dam.
Princeton Hydro was contracted by the United States Army Corps of Engineers (USACE) Philadelphia District to perform a geotechnical evaluation in support of the proposed site improvements at the Letterkenny Army Depot in Chambersburg, Pennsylvania. The base focuses on the maintenance, modification, storage, and demilitarization of equipment for the United States Army. The base consists of numerous buildings/warehouses and parking/storage lots for military equipment spanning over 18,000 acres.
The area in which the site work was conducted is approximately 10 acres in size and is the proposed area for a new consolidated Shipping and Receiving Warehouse for receipt of items and component materials being inducted into the depot for recapitalization or reset.
For this field investigation project, Princeton Hydro was tasked with coordination and oversight of a Geophysical survey of the project area to identify, delineate, and characterize subsurface targets; performance of fourteen (14) geotechnical borings with associated rock coring to supplement USACE design of the site improvements; and performance of three (3) test pits to determine the depth to groundwater/seasonal high groundwater as well as the rippability of the bedrock on site.
For the geophysical survey, Princeton Hydro subcontracted Hager-Richter Geoscience. This survey included ground penetrating radar (GPR), time domain electromagnetic induction metal detection (EM61), and precision utility location. During the geophysical survey, Princeton Hydro was on site to act as a point of contact with the client as well as the Site Safety and Health Officer as outlined in USACE EM 385-1-1.
For the geotechnical borings and test pits, Princeton Hydro subcontracted CGC Geoservices. Borings were completed by way of a CME-55 truck mounted drill rig. In each boring advanced, sampling was performed continuously until the target depth was achieved. If bedrock was encountered before each target depth, rock coring was performed until a minimum of 10 feet of recovered core sample was observed to be competent rock. Test pits were completed by way of a John Deere 310L EP rubber tire backhoe. Test pits were advanced to bedrock, at which time the backhoe would attempt to progress until bucket refusal to determine the rippability of the rock. Princeton Hydro was on site during all geotechnical borings and test pits to prepare descriptive boing/test pit logs as well as act as the Site Safety and Health Officer as outlined in USACE EM 385-1-1.
Upon completion of the field investigation, Princeton Hydro performed laboratory testing on select soil sampling representative of the stratigraphy observed at the site in our in-house AASHTO-accredited and USACE-validated materials testing laboratory. The results of the lab testing were utilized to establish subsurface strata to aid USACE with the design of the proposed site features.
In 2006, The United States Army Corps of Engineers, New York District (USACE) subcontracted Princeton Hydro, LLC and Monmouth University to perform a Microbial Source Tracking study (MST) of the Bronx River watershed by using Antibiotic Resistance Analysis (ARA). The watershed includes nearly 1.8 million people and encompasses 36,096 acres in 13 municipalities of Westchester County.
Princeton Hydro partnered with Monmouth University to perform the following tasks: • Spring, summer and fall pathogen surveys • Validation of the Monmouth County ARA database • Creation of a Bronx River ARA Database • Evaluation of land uses and analytical data for pathogens and nutrient loading • Evaluation of stormwater management problem areas • Best Management Practices (BMP) recommendations
While geese, pets, and horses contribute to the bacteria counts in the Bronx River, the impacts from 1.8 million people are a likely dominant source. This population also relies upon aging infrastructure and combined conveyance systems for stormwater and wastewater that were built in 1900. This infrastructure is undersized, fraught with leaks, and is subject to breaks, illicit connections, direct discharges, and combined sewer outfalls. Stormwater management in the watershed consists mainly of street drains and storm sewer connections to the river and its tributaries, with little or no retention.
Potential BMPs recommended for the Bronx River included source control via some of the following: • Regulatory Activities • Redevelopment and Green Building • Stormwater Management BMPs • Infrastructure Remediation
Water quality improvement recommendations included addressing illicit connection problems and reducing stormwater loading of bacteria. These recommendations were designed in concert with the project partners and looked for real world, achievable solutions towards river improvement.
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