| | BEAL MOUNTAIN MINE CERCLA PROJECT, BEAVERHEAD-DEERLODGE NATIONAL FOREST | TETRA TECH, INC. | $160,783 | FOREST SERVICE | FOREST SERVICE | — | 541330Engineering Services | H999OTHER QC/TEST/INSPECT- MISCELLANEOUS | May 29, 2026 | Jun 8, 2026 | Dec 31, 2027 |
| | LONG TERM OPERATION AND MAINTENANCE FOR NEW WORLD FORMER MINING AREA. | TETRA TECH, INC. | $101,640 | FOREST SERVICE | FOREST SERVICE | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | May 12, 2026 | May 12, 2026 | May 31, 2027 |
| | R1 BEAL MOUNTAIN MINE 2026 WATER TREATMENT | TETRA TECH, INC. | $275,250 | FOREST SERVICE | FOREST SERVICE | — | 541330Engineering Services | J046MAINT/REPAIR/REBUILD OF EQUIPMENT- WATER PURIFICATION AND SEWAGE TREATMENT EQUIPMENT | May 11, 2026 | Jun 1, 2026 | May 31, 2027 |
| | REVEGETATION AND SUBSIDENCE MONITORING AT RILEY PASS, CUSTER GALLATIN NATIONAL FOREST | TETRA TECH, INC. | $96,554 | FOREST SERVICE | FOREST SERVICE | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Apr 21, 2026 | Apr 21, 2026 | Dec 31, 2026 |
| | BLUFF B SEEP/SPRING MONITORING, CUSTER GALLATIN NATIONAL FOREST | TETRA TECH, INC. | $37,301 | FOREST SERVICE | FOREST SERVICE | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Apr 21, 2026 | Apr 21, 2026 | Dec 31, 2026 |
| | AIR MONITORING DURING CONSTRUCTION WORK AT BLUFF B FY26, CUSTER GALLATIN NATIONAL FOREST | TETRA TECH, INC. | $36,167 | FOREST SERVICE | FOREST SERVICE | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Apr 17, 2026 | Apr 16, 2026 | Oct 31, 2026 |
| | SEDIMENT TESTING AT BLUFF B, CUSTER GALLATIN NATIONAL FOREST | TETRA TECH, INC. | $17,704 | FOREST SERVICE | FOREST SERVICE | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Apr 15, 2026 | Apr 15, 2026 | Oct 31, 2026 |
| | REGION 1 CERCLA MINE RECLAMATION SUPPORT GUARANTEED MINIMUM | TETRA TECH, INC. | $2,000 | FOREST SERVICE | FOREST SERVICE | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Mar 4, 2026 | Mar 4, 2026 | Nov 30, 2027 |
| | RO ENG RILEY PASS BLUFF B NATURAL REGRADE LANDFORM CONSOLIDATION REVIEW | TETRA TECH, INC. | $20,707 | FOREST SERVICE | FOREST SERVICE | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Mar 3, 2026 | Mar 3, 2026 | Jun 30, 2026 |
| | RO ENG RILEY PASS 2026 CONSTRUCTION INSPECTION | TETRA TECH, INC. | $228,298 | FOREST SERVICE | FOREST SERVICE | — | 541330Engineering Services | C219ARCHITECT AND ENGINEERING- GENERAL: OTHER | Mar 3, 2026 | Mar 3, 2026 | Dec 31, 2026 |
| | MICRO-PURCHASE C51 ROOF ASBESTOS INSPECT | TETRA TECH, INC. | $2,177 | BUREAU OF INDIAN AFFAIRS | BUREAU OF INDIAN AFFAIRS | — | 541620Environmental Consulting Services | Q301MEDICAL- LABORATORY TESTING | Mar 4, 2025 | Mar 4, 2025 | Mar 31, 2025 |
| | IGF::CT::IGF TETRA TECH EMERGENCY ASBESTOS&ABATEMENT BLACKFEET DORMITORY | TETRA TECH, INC. | $36,974 | BUREAU OF INDIAN AFFAIRS | BUREAU OF INDIAN AFFAIRS | — | 562910Remediation Services | F101ENVIRONMENTAL SYSTEMS PROTECTION- AIR QUALITY SUPPORT | Jan 30, 2016 | Jan 30, 2016 | Sep 30, 2016 |
| | IGF::OT::IGF INSPECTION- HOUSEHOLD AND COMMERCIAL FURNISHINGS AND APPLIANCES | TETRA TECH, INC. | $2,731 | INDIAN HEALTH SERVICE | INDIAN HEALTH SERVICE | — | 541350Building Inspection Services | H372INSPECTION- HOUSEHOLD AND COMMERCIAL FURNISHINGS AND APPLIANCES | Jan 30, 2013 | Jan 30, 2013 | Mar 2, 2013 |
| | FUEL SPILL CLEANUP | TETRA TECH, INC. | $5,000 | NATIONAL PARK SERVICE | — | — | 541620Environmental Consulting Services | — | Jan 22, 2009 | Jan 22, 2009 | Jan 30, 2009 |
| | FUEL SPILL CLEANUP | TETRA TECH, INC. | $4,321 | NATIONAL PARK SERVICE | — | — | 541620Environmental Consulting Services | AJ31 | Dec 9, 2008 | Dec 9, 2008 | Dec 9, 2008 |
| | REMEDIATION OF LEAD BASE PAINT IN QUARTERS ROCKY MTN REGION | TETRA TECH, INC. | $142,358 | BUREAU OF INDIAN AFFAIRS | — | — | 541620Environmental Consulting Services | Z161 | Sep 8, 2008 | Sep 8, 2008 | Oct 31, 2009 |
| | CLEAN CONTAMINATED SUMP ELEVATOR PIT - BOZEMAN FB/PO. | TETRA TECH, INC. | $9,999 | PUBLIC BUILDINGS SERVICE | PUBLIC BUILDINGS SERVICE | — | 238990All Other Specialty Trade Contractors | Z111 | Sep 2, 2008 | Sep 2, 2008 | Oct 30, 2008 |
| | INVOICE #50148582 DATED 3/28/08 FOR ASBESTOS REINS | TETRA TECH, INC. | $9,408 | VETERANS AFFAIRS, DEPARTMENT OF | — | — | — | H312INSPECTION- FIRE CONTROL EQUIPMENT | Jun 18, 2008 | Jun 18, 2008 | Jun 28, 2008 |
| | ENGINEERING (MANAGEMENT/SUPPORT) | TETRA TECH, INC. | $39,760 | INDIAN HEALTH SERVICE | — | — | 541330Engineering Services | AJ46 | Nov 1, 2007 | Nov 1, 2007 | Nov 1, 2007 |
| | EMERGENCY - ASBESTOS REMOVAL IN BUILDING 126 | TETRA TECH, INC. | $20,894 | BUREAU OF INDIAN AFFAIRS | — | — | 541330Engineering Services | 9999MISCELLANEOUS ITEMS | Sep 20, 2007 | Sep 20, 2007 | Dec 31, 2007 |
| | SITE ASSESMENT | TETRA TECH, INC. | $5,515 | BUREAU OF INDIAN AFFAIRS | — | — | 541330Engineering Services | 9999MISCELLANEOUS ITEMS | Jul 11, 2007 | Jul 11, 2007 | — |
| | — | TETRA TECH, INC. | $3,758 | BUREAU OF INDIAN AFFAIRS | — | — | 541620Environmental Consulting Services | F101ENVIRONMENTAL SYSTEMS PROTECTION- AIR QUALITY SUPPORT | Jun 15, 2007 | Jun 15, 2007 | Sep 4, 2007 |
| | — | TETRA TECH, INC. | $2,500 | BUREAU OF INDIAN AFFAIRS | — | — | 562910Remediation Services | 6850MISCELLANEOUS CHEMICAL SPECIALTIES | Jun 28, 2006 | Jun 28, 2006 | Sep 30, 2006 |
| | LEAD PAINT ABATEMENT IN VARIOUS SCHOOL DORMS/QUARTERS | TETRA TECH, INC. | $1,454,857 | BUREAU OF INDIAN AFFAIRS | — | — | 562910Remediation Services | Z169 | Sep 8, 2005 | Sep 28, 2005 | Jan 31, 2010 |
| | — | TETRA TECH, INC. | $5,973 | BUREAU OF INDIAN AFFAIRS | — | — | 541330Engineering Services | 8999 | Sep 8, 2005 | Sep 8, 2005 | — |