TETRA TECH, INC.

CROSS BROTHERS SUPERFUND SITE, SSID 0586, NEW SEMD SFGLAES TETRATECH TASK ORDER, CONTRACT 68HE0523D0004.

REMEDIAL ACQUISITION FRAMEWORK - RAF, DESIGN AND ENGINEERING SERVICES - DES. THE DES CONTRACT WILL PROVIDE SERVICES TO SUPPORT EPAS CLEANUP PROGRAMS, PRIMARILY THE SUPERFUND PROGRAM. THIS CONTRACT REQUIRES THE CONTRACTOR TO FURNISH ALL NECESSARY PERSONNEL WITH THE APPROPRIATE KNOWLEDGE AND EXPERTISE, MATERIALS, EQUIPMENT AND SERVICES OR INCIDENTAL TO PERFORMING AND COMPLETING THE WORK IN ACCORDANCE WITH THE REQUIREMENTS OF THE STATEMENT OF WORK. THESE CONTRACTS REQUIRE PERSONNEL TO DELIVER THE FOLLOWING SERVICES: FIELD WORK AND ANALYTICAL SUPPORT, TREATABILITY STUDIES, REMEDIAL INVESTIGATION-FEASIBILITY STUDIES, ENGINEERING EVALUATION-COST ANALYSIS, REMEDIAL DESIGN, OVERSIGHT OR OVERSIGHT SUPPORT AND OTHER GENERAL TECHNICAL ASSISTANCE.

TASK ORDER #02 - TECHNICAL SUPPORT AND TRAINING ACTIVITIES

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), TASK ORDER FOR REMOVAL ACTIVITIES.

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), DATA MANAGEMENT SUPPORT ACTIVITIES TASK ORDER.

TASK ORDER #05 - REMEDIAL ASSESSMENT SUPPORT ACTIVITIES

REGION 3 SUPERFUND TECHNICAL ASSESSMENT&RESPONSE TEAM VI (START VI)

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), TASK ORDER FOR PROGRAM AND ADMINISTRATIVE OVERHEAD (PAO)

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), TASK ORDER FOR LINDSAY LIGHT SITE (SSID# 05YT).

FEDERATED METALS CORP. WHITING SUPERFUND SITE: R5, SFGLAES, SEMD, TETRATECH, RI/FS & RD TO

REMEDIAL ACQUISITION FRAMEWORK (RAF) DESIGN AND ENGINEERING SERVICES (DES) DES PROJECT TITLE: BENFIELD INDUSTRIES, INC. SUPERFUND SITE OPERABLE UNIT 1 (OU1) REMEDIAL DESIGN WAYNESVILLE, HAYWOOD COUNTY, NORTH CAROLINA

SUPERFUND AND GREAT LAKES ARCHITECTURE & ENGINEERING SERVICES (SFGLAES)

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), TASK ORDER FOR PRE-REMEDIAL ACTIVITIES.

REGION 5, SUPERFUND TECHNICAL ASSESSMENT & RESPONSE TEAM VI (START VI), THIS INITIAL ORDER IS TO OBLIGATE FUNDS FOR MAIN STREET WELL FIELD SSID: 05D3 IN THE AMOUNT OF $265,011.11.

SHIAWASSEE RIVER RIFS SUPERFUND SITE. SSID 051D.

TASK ORDER #01 - REMOVAL SUPPORT AND PREPAREDNESS/PREVENTION ACTIVITIES

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

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

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 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).

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.

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).