sanborn, head & associates, inc. (sha) is a privately held, multi-disciplinary firm of consulting engineers and scientists providing geoenvironmental and geotechnical services to clients across the united states and internationally. at present our firm includes approximately eighty professionals and support personnel. we are based in office locations in new england, the midwest, and the united kingdom. environmental, geoenvironmental, geotechnical, consulting, engineers, hydrogeology, remediation, professional engineer, professional geologist, project management, civil engineer, boston area, westford, massachusetts, ma, new hampshire, nh, ohio, portland, maine, me, vermont, vt, international