WASHINGTON, Aug. 9 -- AZTEC CONTRACTING, Omaha, Nebraska, won a federal contract award for $240,000 from the Department of the Interior National Park Service, Omaha, Nebraska, for plumbing, heating, and air-conditioning contractors. Contract Award Number: 140P6026P0039; NAICS Code: 238220; Product Service Code (PSC): N063; Solicitation Number: 140P6026Q0044  more