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This is a notice of intent to solicit from a single source for the USGS Pacific Coastal and Marine Science Center, Santa Cruz, CA. The US Geological Survey (USGS) intends to award a Purchase Order to ... This is a notice of intent to solicit from a single source for the USGS Pacific Coastal and Marine Science Center, Santa Cruz, CA. The US Geological Survey (USGS) intends to award a Purchase Order to Nortek USA Inc. The facility requires the purchase of six (6) acoustic doppler profilers with the below specific salient characteristics. Nortek USA Inc. is, to the USGSs knowledge, the only source who can provide required equipment that possesses these specific salient characteristics. Required features and specifications: Pacific Coastal & Marine Science Center (PCMSC) requires six 1MHz Broadband and pulse-coherent acoustic Doppler profilers for autonomous deployment to acquire long-term measurements of current velocity profiles and waves for an Independent Verification and Validation study of artificial reefs. Acoustic Doppler Current Profilers (ADCPs) are the standard in current measurement, replacing older, more man hour intensive technologies. Current measurements throughout the water column are an integral part of this field program, and in particular, the ability to take multiple, precise measurement of the currents within a single meter with high frequency is necessary to resolve wave velocities and turbulence in the vicinity of artificial reef structures. A 1 MHz unit is required for the water depth and desired depth resolution at the proposed deployment site. The size and shape of the instrument itself is important for mounting considerations and can significantly affect the measurements of other instruments and must be considered. High resolution measurements of acoustic backscatter and vertical velocity are critical to studies of turbulence and sediment transport. The essential required characteristics are: A. Broadband acoustic Doppler measurements of currents and waves B. 5 acoustic beams with one oriented vertically C. Instrument housing to be less than 6 inches in diameter, and 6.5 inches tall to fit mounting constraints D. Ability to record high-resolution pulse-coherent profiles of currents (<0.05m cell size) on at least one acoustic beam E. Ability to record very high-resolution profiles of backscatter (<0.005m) on at least one acoustic beam F. Ability to record broadband profiles of average currents interleaved with bursts of pulse-coherent profiles of currents. G. Ability to measure currents up to 16 Hz H. Burst data collection capability I. 64Gb of internal memory J. Ability to write data into netCDF format for data dissemination and archival Award will be made in accordance with Federal Acquisition Regulation (FAR) 13.106-1(b) and the procedures at FAR Part 12 entitled, Acquisition of Commercial Items and FAR Part 13 entitled, Simplified Acquisition Procedures. The NAICS code for this action is 334513 Instruments and Related Products Manufacturing for Measuring, Displaying, and Controlling Industrial Process Variables, with the associated size standard of 750. Responses or inquiries shall only be accepted through electronic mail addressed to thuot@usgs.gov and must be uploaded and received in their entirety no later than 05/11/2022 1700 PD. Responses submitted by hardcopy or through SAM.gov shall not be accepted or considered.