An engineer is not liable for the safety of persons or property on or about a construction project site, or for the construction techniques, procedures, sequences and schedules, or for the conduct, action, errors, or omissions of any construction contractor, subcontractor, or material supplier, their agents or employees, unless the engineer assumes responsibility therefor by contract or by the engineer’s actual conduct. Nothing herein may be construed to relieve an engineer from liability for negligence, whether in the engineer’s design work or otherwise.