A typical geotechnical engineering project begins with a review of the project needs to define the required material properties. Then follows a review of published geological data and potential impacts of the same. From here, a site investigation program will be generated for the study of soil, rock, fault distribution and bedrock properties on and below an area of interest to determine their engineering properties including how they will interact with, on or in a proposed construction. Site investigations are needed to gain an understanding of the area in or on which the engineering will take place. Investigations can include the assessment of the risk to humans, property and the environment from natural hazards such as earthquakes, landslides, sinkholes, soil liquefaction, debris flows and rockfalls.

A geotechnical engineer then determines and designs the type of foundations, earthworks, and/or pavement subgrades required for the intended structures to be built. Foundations are designed and constructed for structures of various sizes such as high-rise buildings, bridges, medium to large commercial buildings, and smaller, medium or larger structures. Renaissance Geotechnical Engineering, PLLC can provide a range of subsurface investigation and geotechnical evaluation services in the following major areas:

  • Transportation: Highways, Bridges, Retaining Walls, Rock Protections, and more
  • Developments: Commercial, and Residential
  • Energy: Solar, Natural Gas Compressor Stations, Gas Plants, High Transmission Lines
  • Airports: Subsurface Investigation and Pavement Design per FAA Guidelines
  • Miscellaneous Evaluation or Mitigation: Soil Stabilization or Reinforcement, Slope Stability and Settlement Analyses, Percolation or Infiltration
  • Dams: Engineering Assessment, Emergency Action Plans, Inspection and Maintenance
  • Construction Geotechnical Special Inspection and Testing
  • Construction Administration



Our Team

Alseny Diop, PE: Managing Member

Mr. Diop is the Owner and Principal Geotechnical Engineer of RENAISSANCE GEOTECHICAL ENGINEERING, PLLC (RENAISSANCE) established in January 2020. Mr. Diop is a registered Professional Engineer in OK, TX, NY, NJ, CT, RI, CO, and MD. With over 17 years of combined experience in geotechnical engineering, construction material inspection and testing, Mr. Diop obtained a bachelor’s degree in civil engineering in 2002, and a master’s degree with geotechnical engineering concentration in 2011 from the University of Oklahoma.  Over the years, Mr. Diop has served as the lead geotechnical engineer in completing numerous projects for foundation design to support single- and multi-span bridges, water tanks, single and multi-family residences, commercial buildings, parking garages, compressor stations, sub-stations, high voltage transmission lines, cell towers, wind turbines, retaining walls, and other transportation related structures including culverts and bridges mainly in NY, OK and TX. Prior to starting RENAISSANCE, Mr. Diop worked as the Senior Geotechnical Engineer & Department Manager for C.T. Male Associates, Engineering, Surveying, Architecture, Landscape Architecture & Geology, D.P.C., a New York State based company and EST, Inc., an Oklahoma and Texas based company. Mr. Diop’s experience also expands into the inspection and maintenance of dams, the evaluation and design of wastewater lagoon liners, the structural design of pavements to support both heavy duty and light duty traffic, as well as the analysis of the stability of embankment slopes. He also completed numerous pedological and geological surveys in accordance with NRCS for the Oklahoma Department of Transportation (ODOT). A few sample projects completed by Alseny between the three companies are shown:

  • Thompson Island Suspension Bridge – Saratoga County, New York
  • Single-Span Bridge Crossing a Tributary of Coeymans Creek – Albany County, New York
  • County Road 65 Bridge over Hunns Lake Road – Dutchess County, New York
  • Covanta Span Bridge – Nassau County, New York
  • County Road 21 (Noxon Road) Bridge Over Jackson Creek – Dutchess County, New York
  • County Road 412 (Airport Road) Culverts Over Hannacrois Creek (2 Sites) – Albany County, New York
  • Bog Meadow Trail, Single-Span Pedestrian Bridge Replacement – Saratoga County, New York
  • 84 Lumber Company Pavement Evaluation and Design – Albany County, New York
  • Newbury Hotel – Coxsackie, Greene County, New York
  • Woodstock Development – Single Family Residence including rock stability evaluation – Ulster County, New York
  • SUNY Oneonta Excavation Support Design – Otsego County, New York
  • SUNY Potsdam – Carson Hall Renovation Elevator Shafts & Stairs – St. Lawrence County, New York
  • Lake Walton Preserve Phase 1 – Dutchess County, New York
  • Youth Parents United Transitional Housing for Young Moms – Schenectady County, New York
  • Lofts at Harmony Mills Segmental Retaining Wall and Pavement Evaluation – Albany County, New York
  • Subsurface Exploration and Geotechnical Evaluation of the Proposed Saratoga Springs City Center Parking Garage – Saratoga Springs, New York
  • Affordable Housing, Cottage Place Gardens (CPG 4 and 5) – Yonkers, New York
  • Glens Fall Hospital Addition – Glens Fall, New York
  • Ulster County & Ulster Landing Fire Training Facility and Proposed Multi-Story Burn Building
  • KAPL Water Storage Tank – Niskayuna
  • St. Gobain Oxidizer Pad – Hoosicks Fall, New York
  • Spillway Rehabilitation and Engineering Assessment of Washington Lake Dam – Newburgh
  • Engineering Assessment of the West Albany and Lake Ridge Dams – Albany County
  • Bethlehem Slope Stability Evaluation at the Verizon Building – Albany County
  • Lamson Causeway CR-11 Culvert Replacement – Orange County
  • Binghamton Campus Pavement Rehabilitation and Reclamation
  • Schroon Lake Shore Stabilization Study and Design – Essex County
  • South Shore Road, Bridge Replacement over the Oswegatchie River – St. Lawrence County
  • Reconstruction of the Single-Span Bridges 243 and 269 – Sullivan County
  • Single-span bridge replacement over Oquaga Creek – Broome County
  • Fall Kill Dam Engineering Assessment – Dutchess County
  • Washington lake dam Spillway Rehabilitation for the City of Newburgh – Orange County
  • Wheeler District Phase 2 – Oklahoma County, Oklahoma
  • The 16-span bridge over the red river between Oklahoma and Texas
  • The South Duncan bypass Roadways and Bridges – Duncan, Oklahoma
  • US Highway 75 Roadway and Bridges in Okmulgee County, Oklahoma
  • Multiple Compressor Stations across Oklahoma and some in Texas
  • A variety of Solar Sites across New York State
  • Airport pavement design in accordance with FAA Guidelines for different airports across Oklahoma


  • MBE and DBE

Our Team

Donald J. Sipher, PE: Senior Geotechnical Engineer

Mr. Sipher is a well-rounded, experienced, senior engineering executive having progressive responsibility and technical/business leadership roles . His leadership development within F&R (Froehling &Robertson) started as a Lead Geotechnical Engineer where he oversaw more than half of the office’s revenues. He then progressed to Office Manager for 13 years where he was responsible for operations, securing new work and financial accountability for a 40-person person office. This was followed by 13 years as Regional Vice President with responsibility for operations of half of the company, and two years as Chief Operating Officer. From 2014 to 2019, as President of F&R, he oversaw net revenues growth from $32M to $42M. As part of reorganization, he assumed a Senior VP/Regional Manager role with a number of the firm’s offices under his direction and control.

In late 2019 he was brought onto the Executive Team with Atlantic Testing Laboratories as Vice President of Engineering with responsibility to grow engineering services across the company and to mentor young engineers in pursuit of professional licensing, among other responsibilities. Mr. Sipher is now part of Renaissance’s team as a Senior Engineer providing oversight and quality control on geotechnical reports. Don also assists in mentoring young geotechnical professionals. A few sample projects completed under the supervision of Mr. Sipher between these companies are shown next:

  • SUNY Potsdam – Renovation of Carson Hall Elevator Shafts and Stairs – St. Lawrence County, New York
  • Laurel Bed Dam, Russell Co, VA – designed a grouting plan to reduce excessive seepage 80%.
  • Nelson County Dam, Nelson Co, VA – designed a baffle block spillway to increase capacity to 0.5 PMF.
  • Lake Merriweather Dam – designed new PMF spillway.
  • Lake Burke – designed sheet pile extension and resized emergency spillway,
  • Kent Lake – designed overflow concrete spillway to replace undersized structure.
  • Ticonderoga Historic Sawmill Reconstruction, Ticonderoga, NY
  • Colton DPW Salt Dome, S. Colton, NY
  • Georgia Pacific Slab Reconstruction, Plattsburg, NY
  • Rensselaer County Fire Training Facility, Rensselaer County, NU
  • Port Ewen Water Tank, Port Ewen, NY
  • Kingston Bridge Replacement. Kingston, NY
  • Port of Albany Bridge, Bethlehem, NY
  • Marcy Nanotech Building, Utica, NY
  • Fairmont Water Reservoir, Syracuse, NY
  • Delanson WWTP Addition, Delanson, NY
  • Soway Facility, Massena, NY
  • Clinton County School Addition, Champlain, NY


We are committed to upholding our most cherished values that are first and foremost the protection of the public while providing cost-effective, sound geotechnical engineering services