Department of the Army, US Army Engineer District, Buffalo, 1776 Niagara Street, Buffalo, NY 14207-3199

S -- OPEN-END CONTRACT FOR RISK ASSESSMENT AND MODELING SERVICES WITHIN THE BOUNDARIES OF THE GREAT LAKES AND OHIO RIVER DIVISION POC Contract Officer, Mary E. Price, (716) 879-4252 CNT DACW49-00-D-0001 (DACW49-00-R-0006) AMT Base period $1,000,000.00 for 2 years and 1 $1,500,000.00 3- year option DTD 010900 TO SBA/HydroGeologic Inc., Suite 900, 1155 Herndon Parkway, Herndon, VA 20170-5534 (AC0204003-05) Posted 02/04/00 (I-SN422216). (0035)

Loren Data Corp. http://www.ld.com (SYN# 0358 20000208\S-0001.AWD)