TETRA TECH, INC.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). THIS TASK ORDER IS FOR WORK AT THE LASALLE ELECTRICAL UTILITIES SITE. MODIFICATION 2; OBLIGATE FUNDS.

2025 CALIFORNIA WILDFIRES AND STRAIGHT-LINE WINDS EVENT R5 CROSSOVER SUPPORT FOR R9 FOR EMERGENCY SUPPORT FOR SOCAL WILDFIRES FOR THE REMOVAL OF HAZARDOUS MATERIALS AND HOUSEHOLD WASTE. MODIFICATION 2: DEOBLIGATE FUNDS AND CLOSE OUT TASK ORDER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). THE PURPOSE OF THIS MODIFICATION IS TO OBLIGATE FUNDS IN THE AMOUNT OF $100,000.00 AND ADMINISTER 10-TOLINS TO THIS TASK ORDER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). MODIFICATION 5; OBLIGATION OF FUNDS.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), TASK ORDER FOR PROGRAM AND ADMINISTRATIVE OVERHEAD (PAO). MODIFICATION 3; OBLIGATE FUNDS.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). RADIOLOGICAL STABILIZATION DEMONSTRATION SUPPORT TASK ORDER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), DATA MANAGEMENT SUPPORT ACTIVITIES TASK ORDER.

DEOBLIGATE REMAINING EXCESS FUNDS IN THE AMOUNT OF $660,910.48 CLOSE TASK ORDER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). THE PURPOSE OF THIS MODIFICATION IS TO OBLIGATE FUNDS IN THE AMOUNT OF $250,000.00 TO THIS TASK ORDER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI); TARGETED BROWNFIELDS ASSESSMENT TASK ORDER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), RRT5.ORG MAINTENANCE SUPPORT TASK ORDER.

MODIFICATION P00047 PROVIDES ADDITIONAL FUNDING IN THE AMOUNT OF $90,000.00 FOR CONTINUED REMOVAL SUPPORT AND PREPAREDNESS/PREVENTION ACTIVITIES UTILIZING HOMELAND SECURITY FUNDS. TASK ORDER #01 - REMOVAL SUPPORT AND PREPAREDNESS/PREVENTION ACTIVI

EAST TROY CONTAMINATED AQUIFER SUPERFUND SITE: REMEDIAL ACQUISITION FRAMEWORK (RAF), DESIGN AND ENGINEERING SERVICES (DES), CLIN 0002 REMEDIAL DESIGN (RD) TASK ORDER THE PURPOSE OF MODIFICATION P00019: 1. ADDITIONAL SERVICES FOR TASKS 2.2.2.2; 6.1

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $2,275.91. CLOSE TASK ORDER.

MODIFICATION P00074 ADDS FUNDING IN THE AMOUNT OF $32,151.34 FOR THE COLLECTION OF SAMPLES FROM MUNICIPAL AND COMMERCIAL DRINKING WATER SUPPLY WELLS AT THE EAST BASIN ROAD (A36K) OU01 SITE. TD NUMBER: T605-25-09-002 TASK ORDER #05 - REMEDIAL ASSES

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). THE PURPOSE OF THIS MODIFICATION IS TO OBLIGATE FUNDS IN THE AMOUNT OF $5,000.00 TO THIS TASK ORDER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). THE PURPOSE OF THIS MODIFICATION IS TO OBLIGATE FUNDS IN THE AMOUNT OF $50,000.00 AND ADMINISTER 6-TOLINS TO THIS TASK ORDER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). THE PURPOSE OF THIS MODIFICATION IS TO OBLIGATE FUNDS IN THE AMOUNT OF $500,000.00 AND ADMINISTER TDTOLINS TO THIS TASK ORDER.

MODIFICATION P00046 PROVIDES ADDITIONAL FUNDING IN THE AMOUNT OF $100,000.00 FOR CONTINUED REMOVAL SUPPORT AND PREPAREDNESS/PREVENTION ACTIVITIES UTILIZING REIMBURSABLE OIL FUNDS. TASK ORDER #01 - REMOVAL SUPPORT AND PREPAREDNESS/PREVENTION ACTIVI

MODIFICATION P00073 ADDS FUNDING IN THE AMOUNT OF $52,834.00 FOR CONTRACTOR SUPPORT TO PERFORM GROUNDWATER SAMPLING FOR THE PRESENCE OF PFAS AT THE GREENWOOD CHEMICAL 03P5 OU00 SITE AS A FOLLOW-UP RECOMMENDATION DOCUMENTED IN THE FIVE-YEAR REVIEW. TD

MODIFICATION P00044 ADDS FUNDING IN THE AMOUNT OF $4,000.00 FOR CONTINUED TECHNICAL SUPPORT AND TRAINING ACTIVITIES UTILIZING EXTRAMURAL (H) OIL FUNDS. TASK ORDER #02 - TECHNICAL SUPPORT AND TRAINING ACTIVITIES REGION 3 SUPERFUND TECHNICAL ASSESS

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). THE PURPOSE OF THIS MODIFICATION IS TO OBLIGATE FUNDS IN THE AMOUNT OF $9,197.00 AND TO ADMINISTER A TDTOLIN TO THIS TASK ORDER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), ADAM'S PLATING SITE TASK ORDER; SITE ID: 05DJ.

MODIFICATION P00044 ADDITIONAL FUNDING IN THE AMOUNT OF $131,108.00 FOR THE REMOVAL AND OFF-SITE DISPOSAL OF TENORM IMPACTED SOIL, SLAG, CONCRETE AND OTHER HAZARDOUS SUBSTANCES, POLLUTANTS OR CONTAMINANTS. TASK ORDER #01 - REMOVAL SUPPORT AND PRE

MODIFICATION P00043 ADDITIONAL FUNDING IN THE AMOUNT OF $80,000.00 FOR CONTINUED REMOVAL SUPPORT AND PREPAREDNESS/PREVENTION ACTIVITIES UTILIZING REIMBURSABLE OIL FUNDS. TASK ORDER #01 - REMOVAL SUPPORT AND PREPAREDNESS/PREVENTION ACTIVITIES

MODIFICATION P00043 ADDS FUNDING IN THE AMOUNT OF $38,000.00 FOR CONTINUED TECHNICAL SUPPORT AND TRAINING ACTIVITIES UTILIZING SUPERFUND PREPAREDNESS FUNDS. TASK ORDER #02 - TECHNICAL SUPPORT AND TRAINING ACTIVITIES REGION 3 SUPERFUND TECHNICAL A

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $100.98. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $25,071.55. CLOSE TASK ORDER

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $4,895.81. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $5,192.34. CLOSE TASK ORDER

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $34,609.22. CLOSE TASK ORDER.

(START) START V, REGION 5, TASK ORDER FOR TOWN OF PINES SITE. THE PURPOSE OF THIS MODIFICATION IS TO EXTEND THE PERIOD OF PERFORMANCE.

START V, REGION 5, TO FOR CITY WATER LIGHT AND POWER CPCR (CLOSURE/POST-CLOSURE REVIEW), ADMIN MOD TO EXTEND THE POP AND CHANGE THE CONTRACTING OFFICER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $10,376.87. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $83,854.88. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $752,164.30. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS. ALIGN CEILING CAPACITY TO EXPENDED AMOUNT. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $24.43. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $89,772.66. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $78,080.49. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $364,954.04. CLOSE TASK ORDER.

TO 68HE0519F0069, REMOVAL CERCLA ACTIVITIES, START V, REGION 5. THE PURPOSE OF THIS MODIFICATION IS TO ADMINISTER A TDTOLIN.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $106,227.37. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $155,223.26. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $16,121.42. CLOSE TASK ORDER

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $16.40

(BUY-IN) TO R5 START V TETRA TECH, INC CONTRACT #68HE0519D0005. THE PURPOSE OF THIS MODIFICATION IS TO ADMINISTER TDTOLINS TO THIS TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $81.61. CLOSE TASK ORDER.

DEOBLIGATE EXCESS FUNDS IN THE AMOUNT OF $4,974.16. CLOSE OUT TASK ORDER

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). THE PURPOSE OF THIS MODIFICATION IS TO OBLIGATE FUNDING IN THE AMOUNT OF $500,000.00 AND ADMINISTER TDTOLINS TO THIS TASK ORDER.