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

66 -- SEISMOGRAPHS DUE 093097 POC Maribel Torres (650)329-4171 E-MAIL: Maribel Torres, (650)329-4171, mtorres@isdmnl.wr.usgs.gov. This notification is to modify solicitation No. 123485 to read as stated below: The U.S. Geological Survey (USGS) Menlo Park, California, intends to place on a sole-source basis a purchase order with Terra Technology, Redmond, Washington. The seismographs will be deployed as part of the University of Washington strong-motion seismograph network in the Puget Sound region. The UW and the USGS have a formal coperative agreement to conduct earthquake hazard research in Washington and Oregon. The University's strong-motion Network currently consists of three (3) Terra Technology Corporation (Redmond, WA) IDS-24 digital data recorders. The UW technical staff has invested a substantial amount of electronics and software engineering to install these instruments in the field and get them working. The staff has become familiar with the total Terra Technology system, both hardware and software. Because of this, we believe that repesents the best use of USGS and University resources to purchase three more seismographs that are fully compatible with the seismographs already in the field. (0260)

Loren Data Corp. http://www.ld.com (SYN# 0228 19970919\66-0006.SOL)