TETRA TECH, INC.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). INITIATE NEW TASK ORDER AND FUNDING FOR EQUIPMENT CALIBRATION, REPAIR, MAINTENANCE, PPE.

TASK ORDER #02 - TECHNICAL SUPPORT AND TRAINING ACTIVITIES

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). INITIATE NEW TASK ORDER AND FUNDING FOR TRAINING AND EXERCISE SUPPORT.

MODIFICATION P00079 REVISES CLAUSE H.25 KEY PERSONNEL (EPAAR 1552.237-72) TO ADD AND REMOVE KEY PERSONNEL ON THE CONTRACT. REGION 3 SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI)

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 P00020: RFI 15

MODIFICATION P00079 ADDS FUNDING IN THE AMOUNT OF $6,689.00 FOR TECHNICAL ASSISTANCE TO COMPLETE THE GROUNDWATER SAMPLING TRIP REPORT (1, 4-DIOXANE AND PFAS) AT THE GREENWOOD CHEMICAL (03P5) OU00 SITE TASK ORDER #05 - REMEDIAL ASSESSMENT SUPPORT A

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI).

MODIFICATION P00029 EXTENDS THE TASK ORDER AND ITS ASSOCIATED TECHNICAL DIRECTIONS FOR FOR SIX (6) MONTHS FROM 07/01/2026 TO 12/31/2026 IAW FAR PART 6.103-2 (DEVIATION), UNUSUAL AND COMPELLING URGENCY TASK ORDER #03 - SITE ASSESSMENT SUPPORT ACTIV

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI).

MODIFICATION P00050 FUNDING FOR FIELD SAMPLING, LABORATORY TESTING AND/OR FIELD STAFF PERFORMING REMEDIATION WORK IN SUPPORT OF DISASTER OPERATIONS AT THE POTOMAC INTERCEPTOR SEWER LINE COLLAPSE SITE. TD: T601-26-03-003 TASK ORDER #01 - REMOVAL

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI); TARGETED BROWNFIELDS ASSESSMENT TASK ORDER. THE PURPOSE OF THIS ADMINISTRATIVE MODIFICATION IS TO ADMINISTER TOLINS.

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

ALLIED PAPER CONTRACTOR SUPPORT SERVICES UNDER THE NATIONAL RESPONSE SYSTEM, CERCLA, AND OTHER AUTHORITIES; SITE ID: 059B.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI).

SUPERFUND AND GREAT LAKES ARCHITECTURE & ENGINEERING SERVICES (SFGLAES) P00006 - 1) INCORPORATE FAR 52.222 90, ADDRESSING DEI DISCRIMINATION BY FEDERAL CONTRACTORS (APR 2026) INTO THE CONTRACT IN ACCORDANCE WITH EXECUTIVE ORDER 14398

TAR LAKE SUPERFUND SITE THE PURPOSE OF MODIFICATION P00004: 1) APPROVE RFI 004 FOR ADDITIONAL SURVEY SERVICES IN TASK 6.6.1 CLIN 0001 (MANAGED WITHIN EXISTING BUDGET) AND EXERCISE OPTION YEARS.

RRT5.ORG MAINTENANCE SUPPORT TASK ORDER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), TASK ORDER FOR CHEMICAL EMERGENCY PREPAREDNESS AND PREVENTION (CEPP).

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). THE PURPOSE OF THIS MODIFICATION IS TO DE-OBLIGATE/OBLIGATE FUNDS.

SHIAWASSEE RIVER RIFS SUPERFUND SITE. SSID 051D.

ACME STEEL COKE PLANT SUPERFUND SITE (B5AY): R5, SFGLAES, SEMD, TETRA TECH (68HE0523D0004), RI TASK ORDER

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). MODIFICATION 4 OBLIGATES FUNDS, CHANGES THE INVOICE APPROVER AND THE ALTERNATE INVOICE APPROVER.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). MODIFICATION 2; ADD COR.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), DATA MANAGEMENT SUPPORT ACTIVITIES TASK ORDER. MODIFICATION 1: CHANGE COR AND ADD ACOR.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI). THE PURPOSE OF THIS MODIFICATION IS TO OBLIGATE FUNDS.