Geotechnical Services When the services of geotechnical engineers are reasonably required for the Project, HISD may elect to have the A/E obtain these services as an Additional Service as provided for in Article 3. Otherwise, HISD shall furnish the services of geotechnical engineers. HISD’s written approval is necessary before the services of geotechnical engineers can be enlisted. Such services may include, but are not limited to, test borings, test pits, determinations of soil bearing values, percolation tests, evaluations of hazardous materials, ground corrosion and resistivity tests, including necessary operations for anticipating subsoil conditions, with reports and appropriate professional recommendations. The A/E shall review the completeness and confirm in writing to HISD the sufficiency of the type of tests and information, whether furnished through the A/E or furnished by HISD.