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

66 -- MAGNETOTELLURIC (MT) SURVEY SYSTEM SOL 98WRQQ1034 DUE 083198 POC Contact Sonya Baird, Contracting Officer, (650) 329-4168 The U. S. Geological Survey intends to negotiate a contract with Electromanetic Instruments, Inc. (EMI), 1301 South 46th Street, UCRFS, Bldg. 300, Richmond, CA 94804 to provide a portable magnetotelluric (MT) survey system consisting of the following: 2 ea. 2-Channel Field Acquisition Modules (P/N FAM-2), 1 ea. 3-Channel Field Acquisition Module (P/N FAM-3), 2 ea. Magnetic Field Sensor-0.01-20k Hz (P/N BG-10/HF), 1 ea. Control/Storage Unit (CSU), 1 ea. GPS, 2 ea. Chargers for FAM-2 (P/N BFPSCH), 8 ea. Electrodes, CuCuSO (P/N ELF-1), 1 ea. System Computer, Pentium Laptop with waterproof case (P/N SC-5), 3 ea. SC-5 and CSU Power Supply w/Chargers(P/N P33C), 6 ea. Cable, MT24 Telemetry-100 meters (P/N C21/100), 1 ea. Cable, MT24 Telemetry-10 meters (P/N C21/10), 2 ea. Cable, Junction for C21/100 (P/N C21/JUNC), 12 ea. Cable Dipole-50 meters (P/N C51.50), 3 ea. Cable, BF-10 to FAM-3 (P/N C23/30), and 1 ea. Acquisition Software (P/N SW-ACQ24). EMI is the only known source who can provide the following unique requirements; (1) use of an external IBM compatible PC with open-software to control data acquisition and process time-series date in real time, (2) modular design to allow reconfiguration for various survey modes which allows incorporation of technological advances and configuration for new applications, (3) use of a hardware and software 24-bit A/D, 256 channel, synchronized, MT array data acqusition at selectable MT frequencies and bandwidths which provides rapid, accurate, and continuous profiling, (4) portability, (5) EMI is the developer and the only known manufacturer of underground tensor electromagnetic sources to supplement AMT signals when natural signals are low to noisy. Estimated award date is September 2, 1998. Responses may be mailed to U. S. Geological Survey, Office of Acquisition and Federal Assistance, 345 Middlefield Rd., MS-285, Menlo Park, CA 94025-3591 or fax to (650) 329-5480. Posted 08/14/98 (W-SN237161). (0226)

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