The U.S. Army Corps of Engineers, Rock Island District, intends to procure hydrologic instruments and related maintenance services on a sole source basis from YSI Incorporated. The procurement includes water quality monitoring sondes, river and stream velocity measurement instrumentation, and stream gaging equipment, along with necessary maintenance, calibration, and repair services to comply with Army regulations. This equipment is crucial for effective water quality monitoring and management, and the contract, valued at approximately $725,000, is expected to be awarded in September 2024, covering a base year and four option years. Interested small businesses may submit capability statements to John Wysocki at john.j.wysocki@usace.army.mil, as no competitive quotes will be solicited.