We were fortunate to have partnered with Cornerstone Earth Group, since their firm was established in 2007. Cornerstone has adeptly provided all the geotechnical related services for our municipal engineering projects regardless of the scope, which has included: pavement engineering, bridges, sound walls, retaining walls, slide repairs, creek structures, geomorphology, bioretention basins, hazardous waste handling guidance, and telecommunications towers. They continue to be our “go to” geotechnical engineer without hesitation.
— President, Harrison Engineering, Inc.