Department of the Interior, U.S. Geological Survey, 345 Middlefield Road,Mail Stop 285, Menlo Park, CA 94025-3591

70 -- MULTI-FREQUENCY ACOUSTIC BACKSCATTER SYSTEM SOL 00-7440-5108 DUE 091200 POC trinidad f. biando E-MAIL: tbiando@usgs.gov, tbiando@usgs.gov. THE U.S. Geological Survey intends to procure from Aquatec Electronics, Ltd., the only source for comparable system. We require a multi-frequency acoustic backscatter system designed to measure profiles of resuspended sediment in the bottom 1-2 meters in depths less than 100m. The critical specifications are the following: 1. Multi-frequency operation at 1 to 6 mhz. 2. Integrated data logger with operating software 3. Time-variable gain 4. 1 to 2 meter range 5. Minimum 8 measured bits 6. Minimum 5-hz measurement rate 7. Commercial system (previous sales) with proven operation in sandy coastal environments. DESCRIPTIONS: 1. AQ278-STD acousstic backscatter sensor and data logger 2. 3-pin external trigger connector & cable 3. AQ278 battery pack in underwater housing Posted 08/28/00 (W-SN490805). (0241)

Loren Data Corp. http://www.ld.com (SYN# 0290 20000830\70-0012.SOL)

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