At NOA, our focus is on assisting our clients through project planning, construction and operation while maintaining project schedule and budget, and meeting management and maintenance expectations.

Driven by a global appetite for clean renewable energy coupled with local, state, and federal financial incentives, the market for wind and solar power generation has exploded.  NOA remains on the leading edge of engineering consulting in this dynamic industry.  Wind turbines which can reach 450 feet high, weigh 350 tons with 700-ton reinforced concrete foundations, and cost upwards of $3.5 million each. PV solar arrays can cover acres of virgin land, often trading valuable energy resources for sensitive habitat.  NOA specializes in providing Geotechnical, Geologic, Structural Foundation and Environmental consulting, and additionally, materials testing and inspection services throughout construction.



  • Geotechnical Engineering
  • Structural Foundation Engineering
  • Quality Assurance/Quality Control during Construction
  • Environmental Impact Studies, CEQA and NEPA
  • Drilling and Exploration
  • Site geology characterization including geophysical soundings
  • HSA, mud rotary wash, and rock core drilling
  • Geothermal and Soil resistivity sampling and testing
  • Multichannel Analysis of Surface Waves (MASW)
  • Refraction Micro-tremor Analysis (ReMi),
  • 2D Seismic Refraction Analysis
  • Engineering Geology and  Mapping

NOA field activities include accessing each individual proposed remote site. By using the latest in technology NOA geologists and engineers, through geotechnical and geophysical processing, utilize two-dimensional shear wave velocity profiles that are used for differential settlement, void detection, rippability, and similar engineering uses across large foundation areas.  This technology is used in lieu of drilling where challenging and difficult access conditions exist across bedrock formations such as limestone, basalt, and/or granite.

The geophysical soundings also provide shear wave velocity, primary compression wave velocity and stratum depth and thicknesses along each survey line.  From these geophysical soundings supplemented with strategically placed boring locations, the data gathered in the field is used to produce the required geotechnical data along each survey line for the purpose of providing recommendations for design and constructing the foundation systems.

In accordance with Section 1802.2.6 and Section 1802.2.7 of the 2010 California Building Code, the seismically induced ground motion hazards are addressed in each NOA geotechnical investigation. These include: slope instability, liquefaction, and surface rupture due to faulting or lateral spreading.  Data obtained from NOA field and laboratory test programs are used to make geotechnical and geologic recommendations for each turbine, solar array, substation and transmission lines, road access alignments, Met towers, and/or support buildings to develop the most feasible engineering solution for each project.

Utilizing NOAs’ innovative approach to geotechnical and geologic investigations can result in clients’ savings of up to $200,000 per foundation element, resulting in millions of dollars in realized savings on multi installation facility projects, and has the added benefit of starting the design process much earlier than with traditional drilling.  It is with this philosophy, using a common sense approach with technical resources and a proactive approach in the design solutions, that has rewarded NOA with many repeat clients.