to purchase passive soil gas samplers, drill bits, analysis of passive soil gas samplers, delivery of Leve IV data package, and delivery of isopleth maps

Statement of Work: Multibeam sonar repair Introduction: The U. S. Geological Survey (USGS) Woods Hole Coastal & Marine Science Center (WHCMSC) has the need to repair the multibeam sonar that was sent in for annual inspection and service. The proposed repair is needed to maintain the capability of digital acoustic seafloor mapping of U.S. near shore coastal waters and inland waterways.

Collection of bathymetry and backscatter data, when coupled with an understanding of sub-surface geology, is fundamental to USGS research and provides a framework for addressing coastal erosion, coastal evolution, shoreline/coastal response to large-scale storm systems, offshore resources, and sediment transport studies. The WHSC requires a precision multibeam sonar system to conduct digital acoustic mapping of our coastal oceans, estuaries and coastal shoreline. The repair to the existing system is a more cost-efficient means to maintain these capabilities than procuring an entirely new system.

System Requirements and Salient Characteristics: ¿ This work requires the following measurements and specifications: Light weight (< 8 kg) sonar head assembly 190 ¿ 420kHz wide band frequency range 1 degree center beam across track beam width at 400kHz 2 degree center beam across track beam width at 200kHz 1 degree along-track beam width at 400kHz 2 degree along-track beam width at 200kHz Minimum 10 beams to maximum 1024 beams 0.5 to 150 meter typical depth rating at 400kHz 0.5 to 375 meter typical depth rating at 200kHz 300 meter max depth rating at 400kHz 575 meter max depth at 200kHz 50 pings/s max ping rate Pulse length 15 to 300 microseconds Depth resolution 6mm Sonar head depth rating 50 meters Normalized backscatter Integrates with existing multibeam sonar hardware.