Ordering activities shall establish the BPA with the schedule contractor(s) that can provide the supply or service that represents the best value. This Blanket Purchase Agreement (BPA) addresses the recurring needs of the Forest Service for various petroleum and hazardous materials related services.A statement of work is necessary to communicate the needed service so that the contractor can develop solution and quotes. A Pennsylvania residential purchase agreement establishes a legal arrangement between a buyer and a seller in a real estate transaction.