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AMENDMENT #4 TO CONTRACT - EXTEND TERM TO 10/1/2008, $83,830.35 HAS BEEN ADDED TO AMENDMENT #4 FOR A TOTAL AMOUNT NOT TO EXCEED $475,217.46 (ALSO ATTACHED: LETTER OF AMENDMENT #1 DATED 12/20/2004; LETTER OF AMENDMENT #2 DATED 1/20/2006; & LETTER OF AMENDMENT #3 DATED 1/19/2006)