TETRA TECH, INC.

SUPERFUND TECHNICAL ASSESSMENT&RESPONSE TEAM (START), REGION 4, PROGRAM AND ADMINISTRATIVE TASKS: CONTRACT TASKS, RESPONSE AND READINESS TASKS.

R4 START VI WESTSIDE LEAD TASK ORDER

SOUTHSIDE CHATTANOOGA LEAD REMEDIAL ACTION (START). THE PURPOSE OF THIS MODIFICATION IS TO EXTEND THE TASK ORDER PERIOD OF PERFORMANCE FROM 7/14/2026 TO 10/14/2026, PER THE AUTHORITY OF RFO FAR 52.237-3, CONTINUITY OF SERVICES

REGION 4. SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START). MODIFICATION 7; THE PURPOSE OF THIS MODIFICATION IS TO EXTEND THE TASK ORDER FROM 07/14/2026 TO 10/14/2026.

GEOSPATIAL SUPPORT (START V) THE PURPOSE OF THIS MODIFICATION IS TO EXTEND THE TASK ORDER PERIOD OF PERFORMANCE FROM 7/14/2026 TO 10/14/2026, PER THE AUTHORITY OF RFO FAR 52.237-3, CONTINUITY OF SERVICES

R4 SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START): WESTSIDE LEAD REMEDIAL INVESTIGATION/FEASIBILITY STUDY. THE PURPOSE OF MOD 8: EXTEND THE TO PERIOD OF PERFORMANCE FROM 7/14/2026 TO 10/14/2026, PER RFO FAR 52.237-3 CONTINUITY OF SERVICES

REGION 4, (START); MODIFICATION 12; THE PURPOSE OF THIS ADMINISTRATIVE MODIFICATION IS TO CORRECT THE LINE-ITEM END DATE FROM 01/14/2026 TO 07/14/2026.

SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START) - REGION 4 - FACILITY RESPONSE PLANS/SPILL PREVENTION CONTROL AND COUNTERMEASURES FRP/SPCC. THE PURPOSE OF THIS MOD IS TO EXTEND THE TASK ORDER PERIOD OF PERFORMANCE FROM 7/14/26 TO 10/14

ALARIC TASK ORDER 68HE0420F0048 UNDER THE START V CONTRACT 68HE0519D0006. THE PURPOSE OF THIS MOD IS TO EXTEND THE TASK ORDER PERIOD OF PERFORMANCE FROM 7/14/2026 TO 10/14/2026, PER THE AUTHORITY OF RFO FAR 52.237-3, CONTINUITY OF SERVICES

SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START); MODIFICATION 7; THE PURPOSE OF THIS ADMINISTRATIVE MODIFICATION IS TO CORRECT THE CLIN LINE-ITEM END DATE FROM 01/14/2026 TO 07/14/2026.

SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START), REGION 4 MODIFICATION 16: EXTEND 3-MONTH PERIOD OF PERFORMANCE FROM 7/14/2026 TO 10/14/2026.

REGION 4 SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI CONTRACT - PROGRAM AND ADMINISTRATIVE TASK ORDER

REGION 4 SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI CONTRACT

START REGION 4 ABC CLEANERS

SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START) - REGION 4

SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START), REGION 4; CONTRACT 68HE0519D0006 68HE0525F0022 - HURRICANE HELENE RESPONSE TENNESSEE.

SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START), REGION 4. MISSION ASSIGNMENT 4827DR-NC-EPA-02 FOR THE HURRICANE HELENE RESPONSE.

SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START) REGION 4- SUPERFUND OFFICE.

SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START), REGION 4 (SITE ASSESSMENT ACTIVITIES) STONE'S THROW LANDFILL (SITE ASSESSMENT ACTIVITIES)

START CRISTEX DRUM SITE

SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START), REGION 4: DISTLER BRICKYARD

SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM (START), REGION 4

START V CONTRACT WELLS CLEANER

R429: PROFESSIONAL EMERGENCY RESPONSE FOR R4 TASK ORDER UNDER START 5 SITE ASSESSMENT ACTIVITIES FOR FAIRFIELD NEIGHBORHOOD

REGION 4, (START); ALAMO CONTAMINATED GROUNDWATER (A4TA); MODIFICATION 12; THE PURPOSE OF THIS ADMINISTRATIVE MODIFICATION IS TO CORRECT THE LINE-ITEM END DATE FROM 01/14/2026 TO 07/14/2026.