TETRA TECHNOLOGIES, INC. 25025 Interstate 45 North Suite 600 The Woodlands, TX 77380 Fax: (281) 364-4306 US$90,000,000 Due April 30, 2016 PPN: 88162FA#2 FIRST SUPPLEMENT TO MASTER NOTE PURCHASE AGREEMENT DATED AS OF SEPTEMBER 27, 2004First Supplement to Master Note Purchase Agreement • April 20th, 2006 • Tetra Technologies Inc • Industrial inorganic chemicals • New York
