BASE YEAR, INDEFINITE DELIVERY/INDEFINITE QUANTITY CONTRACT FOR ENVIRONMENTAL SERVICES FOR TULSA DISTRICT, U.S. ARMY CORPS OF ENGINEERS PROJECTS IN SUPPORT OF VARIOUS MILITARY, CIVIL WORKS, AND INTERAGENCY AND INTERNATIONAL SERVICES (IIS) WITHIN THE SOUTHWEST DIVISION (SWD) BOUNDARIES AND FOR CUSTOMERS APPROVED IN ACCORDANCE WITH EFAR SUBPART 7.1 AND ER 5-1-11