Coordination is necessary between the prime construction contractor and specialty contractor(s), consultant(s) and other subcontractors, to avoid duplicated activities or unnecessary downtime. Typically, a specialty contractor or subcontractor under the guidance of an environmental consultant will execute preventive action while working with the prime construction contractor under the overall control of the Engineer. Effective coordination between these parties and their work is important. A Pre-Bid Conference or partnering meeting should be considered. The Engineer should also consider phasing (whether part of the original contract or not) to minimize scheduling conflicts between the prime construction contractor and specialty contractors.