Specifications include, but are not limited to: The Consultant shall perform consultation, research, professional and technical services required for Hazardous Waste Site Investigation and Design Services, including, but not limited to, field sampling, construction materials testing, analysis, reports, plant inspection and work related to testing equipment calibration, on an “as-needed” basis to support the Department of Transportation (Caltrans, Division of Environmental, Environmental Engineering Program, District 12, from PA&ED phase to Construction Technical Support phase completion of various Project, in the maintenance, development and construction of proposed Caltrans transportation facilities. The Caltrans Contract Manager shall assign specific work to the Consultant to assist the Caltrans work force through the issuance of Task Orders describing in detail the services to be performed.