Since the operating and maintenance (O&M) costs of the facilities being procured form a major part of the life cycle cost of the facilities, these costs will be evaluated according to the principles given hereafter, including the cost of spare parts for the initial period of operation stated below and based on prices furnished by each Bidder in Price Schedule No. 1 and 2, as well as on past experience of the Employer or other employers similarly placed. Such costs shall be added to the bid price for evaluation.