***THE NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION'S (NOAA) ACQUISITION & GRANTS OFFICE, EASTERN ACQUISITION DIVISION-NORFOLK, NATIONAL OCEAN SERVICE (NOS) CENTER FOR OPERATIONAL OCEANOGRAPHIC PRODUCTS AND SERVICES (CO-OPS), INTENDS TO NEGOTIATE AND AWARD A PURCHASE ORDER, ON A SOLE SOURCE BASIS, UNDER AUTHORITY OF RFO FAR 6.103-1, WITH YSI INC. OUT OF YELLOW SPRINGS, OHIO FOR WATERLOG/DESIGN ANALYSIS WATER LEVEL SENSORS SPARE PARTS. NO SET ASIDE IS TO BE USED FOR THIS SOLE SOURCE REQUIREMENT. THE ASSOCIATED NAICS CODE IS 334513. ***THE SOLE SOURCE DETERMINATION IS BASED ON NOAA'S REQUIREMENT THAT YSI, INC. IS THE SOLE MANUFACTURER AND DISTRIBTOR OF THE NOAA NILE, FMR51 DESIGN ANALYSIS RADAR WATER LEVEL SENSOR SPARE PARTS. THE NOAA NILE, FMR51 DESIGN ANALYSIS RADAR WATER LEVEL SENSOR IS CO-OPS STANDARD NONCONTACT PRIMARY WATER LEVEL SENSOR USED AT ENVIRONMENTAL MONITORING STATIONS ON THE ATLANTIC COAST, THE GULF OF AMERICA COAST, THROUGHOUT THE PACIFIC, THE GREAT LAKES, THE CARIBBEAN, AND IN COASTAL AREAS OF ALASKA. AS SOLE MANUFACTURER, YSI HAS PROPRIETARY RIGHTS AND KNOWLEDGE TO PRODUCE THE SPECIALIZED OCEANOGRAPHIC EQUIPMENT SPARE PARTS REQUIRED IN THIS PURCHASE. THE SPARE PARTS ARE NECESSARY TO SUPPORT MAINTENANCE EFFORTS AT MONITORING STATIONS WITHIN THE CO-OPS NETWORK, INCLUDING LOWER MISSISSIPPI RIVER PORTS®, DELAWARE RIVER PORTS® AND JACKSONVILLE PORTS®. CO-OPS ENVIRONMENTAL MONITORING SYSTEMS ARE DESIGNED TO OPERATE WITH THE COMPONENTS IN THIS PURCHASE. IMPLEMENTING DIFFERENT COMPONENTS WILL RESULT IN COMPATIBILITY ISSUES. YSI HAS NO AUTHORIZED PARTNERS OR RESELLERS WHO CAN PROVIDE NOAA NILE, FMR51 DESIGN ANALYSIS RADAR WATER LEVEL SENSOR SPARE PARTS. ***THIS PRESOLICITATION NOTICE IS NOT A REQUEST FOR COMPETITIVE PROPOSALS AND NO SOLICITATION PACKAGE IS AVAILABLE. HOWEVER, FIRMS THAT BELIEVE THEY CAN FULLY MEET THE GOVERNMENT'S REQUIREMENTS MAY SUBMIT SUBSTANTIATING DOCUMENTATION OR A REQUEST FOR ADDITIONAL INFORMATION IN WRITING TO THE IDENTIFIED POINT OF CONTACT WITHIN 15 DAYS AFTER PUBLICATION OF THIS PRE-SOLICITATION NOTICE. SUCH REQUESTS AND DOCUMENTATION WILL BE EVALUATED SOLELY FOR THE PURPOSE OF DETERMINING WHETHER OR NOT TO CONDUCT THIS PROCUREMENT ON A COMPETITIVE BASIS. A DETERMINATION BY THE GOVERNMENT NOT TO CONDUCT A COMPETITIVE PROCUREMENT, BASED UPON RESPONSES TO THIS NOTICE, IS SOLELY WITHIN THE DISCRETION OF THE GOVERNMENT. ORAL COMMUNICATIONS ARE NOT ACCEPTABLE IN RESPONSE TO THIS NOTICE.