HYDROGEOLOGIC, INC.

CHANGE ORDER NO. CO-06/RFI-016 RFI-016, DISPOSAL OF CONCRETE SLAB FROM FORMER BEAMHOUSE. RES CREESE AND COOK TANNERY (FORMER) SUPERFUND SITE REMEDIAL ACTION (RA) RA001 AND RA002.

R7 DES: GARVEY ELEVATOR OPERABLE UNIT (OU) 2 AND THE WEST HIGHWAY 6 AND HIGHWAY 281 OU2 REMEDIAL DESIGN MOD P00005 - THE PURPOSE OF THIS MODIFICATION IS TO EXTEND THE PERIOD OF PERFORMANCE AND FUND THE EXTENSION

NEWTON COUNTY MINE WASTE SUPERFUND SITE

R7 DES CONTRACT FOR RI/FS FOR MADISON COUNTY MINES OU7. MOD P00014: ADD FUNDING TO FULLY FUND TASK ORDER

DES BARITE HILLS RD, REGION 4 - DE-OBLIGATION OF FUNDS

DES TASK ORDER - MAIN STREET GROUND WATER PLUME (DES) RI/FS

RES SCOVILL RA LANDFILL SUPERFUND SITE, STORE AVENUE WATERBURY, CT 06705 CHANGE -- DPT DRILLING WITHIN WETLAND AREAS

REMEDIAL ACQUISITION FRAMEWORK (RAF)-DES WOOLFOLK CHEMICAL SUPERFUND SITE REMEDIAL INVESTIGATIONS/FEASIBILITY STUDY (RI/FS) FOR OPERABLE UNIT 5 (OU5), REGION 4

REMEDIAL ACQUISITION FRAMEWORK (RAF)-DES WOOLFOLK CHEMICAL SUPERFUND SITE REMEDIAL INVESTIGATIONS/FEASIBILITY STUDY (RI/FS) FOR OPERABLE UNIT 1 (OU1), REGION 4

ROCKAWAY BOROUGH WELL FIELD OU4 SF - MODIFICATION FOR SCOPE CHANGE DECREASING CLIN 0002.

THE PURPOSE OF THIS FUNDING MOD IS TO ADD FUNDING ON SIBW TO CORRECT THE FUNDING FOR THE OPTION YEAR.

THE PURPOSE OF THIS FUNDING MOD IS TO DEOB FUNDING ON SIBW TO CORRECT THE FUNDING.

NEWTON COUNTY MINE WASTE SUPERFUND SITE

RES SCOVILL RA LANDFILL SUPERFUND SITE, STORE AVENUE WATERBURY, CT 06705

THE PURPOSE OF THIS DES TASK ORDER IS TO PROVIDE TECHNICAL SUPPORT TO ADDRESS HUMAN HEALTH RISKS FROM WIDESPREAD MERCURY CONTAMINATION IN SEDIMENTS AT THE CARSON RIVER MERCURY SUPERFUND SITE (SSID 09R6), PURSUANT TO CERCLA SECTION 104. THE END-PRODUC

DES - STANDARD CHLORINE OF DE (OU4) REMEDIAL ACQUISITION FRAMEWORK (RAF), DESIGN AND ENGINEERING SERVICES (DES)

THIS IS A REMEDIATION ACTION FRAMEWORK (RAF) REMEDIATION ENVIRONMENTAL SERVICES (RES) TASK ORDER (TO) TO PROVIDE REMEDIATION TO SOURCE MATERIAL AND PRINCIPAL THREAT WASTE IN OPERABLE UNIT 2 (OU2) CONTAMINATED SOILS AND SEDIMENTS AT THE BAGHURST DRIVE

STRASBURG LANDFILL (03T6) OU04 $2,440,442.44 CONTRACT: DES/HYDROGEOLOGIC, CONTRACT: 68HE0318D0006, TASK ORDER: NEW GOVT RIFS: NEW TASK ORDER TO START THE REMEDIAL INVESTIGATION/FEASIBILITY STUDY (RI/FS) FOR OPERABLE UNIT 4 (PFAS/SITEWIDE GROUNDWAT

TASK ORDER FOR EAST HELENA OU2 SUPERFUND SITE, RI/FS

RAF, NEW DES TASK ORDER NEEDED FOR MOUAT SUPERFUND SITE. RI/FS WORK

ESO TASK ORDER TITLE: CHEVRON QUESTA MINE SITE THE PURPOSE OF THIS MODIFICATION IS TO EXERCISE THE OPTION FROM NOVEMBER 22, 2025 TO NOVEMBER 21, 2026 USING FY25 FUNDING.

REMEDIAL ACQUISITION FRAMEWORK (RAF), DESIGN AND ENGINEERING SERVICES (DES)POST & LUMBER WOOD PRESERVING SUPERFUND SITE OU1; REMEDIAL DESIGN (RD) FOR THE POST & LUMBER WOOD PRESERVING SUPERFUND SITE OU1; REGION 4

RAF-DES CONTRACT FOR RI/FS FOR MADISON COUNTY MINES OU7. MOD P00012: INCREASE LOE FOR AN ADDITIONAL TREATABILITY STUDY TO COMPLETE THE FS

MODIFICATION P00020 - EXTENDS THE TASK ORDER BY 6-MONTH IAW FAR 52.217-9 AND INCREASE THE CEILING IN THE AMOUNT OF $17,986.90 FOR PROJECT MANAGEMENT COSTS. PANTASOTE 68HE0318D00006/68HE0320F0082 (RAF/DES)

CHANGE ORDER CO-002/RFI-007, ABANDONED WELLS (UNFORESEEN CONDITION) AT CREESE & COOK PROJECT SITE. CHANGE AMOUNT: $17,899.36. RES CREESE AND COOK TANNERY (FORMER) SUPERFUND SITE REMEDIAL ACTION (RA) RA001 AND RA002.

THE PURPOSE OF THIS FUNDING MOD IS TO EXERCISE AND FUND NIBW OPTION YEAR 3 AND ADD FUNDING TO CORRECT PAYMENT ISSUE FROM PREVIOUS YEAR OPT YEAR MOD.

TASK ORDER - FORMERLY USED DEFENSE SITES (FUDS) AT WALLOPS FLIGHT FACILITY, WALLOPS ISLAND, VA. ISSUED UNDER - KSC NASA ENVIRONMENTAL RESTORATION AND COMPLIANCE CONTRACT (NERCC).

CCC-USDA RD AND EDC

DES - CAPE FEAR SITE - REMEDIAL ACQUISITION FRAMEWORK (RAF), DESIGN AND ENGINEERING SERVICES (DES)

LEEDS METAL SUPERFUND SITE, ESO OVERSIGHT TASK ORDER MOD 003 - POP EXTENSION

THE PURPOSE OF THIS ADMINISTRATIVE MODIFICATION IS ADD FUNDS FOR SIBW.

ENVIRONMENTAL SERVICES AND OVERSIGHT TECHNICAL SUPPORT FOR THE CTS PRINTEX SUPERFUND SITE

PRICE ADJUSTMENT BASED ON A CHANGE IN THE APPLICABLE SERVICE CONTRACT ACT WAGE DETERMINATION.

ARROWHEAD PLATING SUPERFUND SITE REMEDIAL DESIGN.

RES CREESE AND COOK TANNERY RA001 AND RA002. CONTRACT: 68HERH19D0010

PR FOR RAF DES TASK ORDER FOR BARKER HUGHESVILLE OU1 SUPERFUND SITE, FS/ROD/RD

TASK 3A ACREAGE CHANGE

DES CONTRACT RD SUPPORT DURING RA AT LCP CHEMICALS OU2

SMALLEY PIPER SITE REMEDIAL ACQUISITION FRAMEWORK (RAF), DESIGN AND ENGINEERING SERVICES (DES)

3RS (RECOGNIZE, RETREAT, AND REPORT) OF EXPLOSIVES SAFETY EDUCATION PROGRAM ARMY INSTALLATIONS AND ARMY NATIONAL GUARD LOCATIONS, VARIOUS LOCATIONS

NASA LANGLEY RESEARCH CENTER ENVIRONMENTAL REMEDIATION SUPPORT SERVICES AND LONG-TERM MONITORING PLAN FOR THE CONSTRUCTION DEBRIS LANDFILL (CDL) SITES. INCLUDES ENVIRONMENTAL REMEDIATION GROUNDS MAINTENANCE OF THE SOIL/CAP COVER OF THE CDL SITE.

DES BARITE HILLS RD, REGION 4

G&L SUPERFUND SITE REMEDIAL ACQUISITION FRAMEWORK (RAF), DESIGN AND ENGINEERING SERVICES (DES)

FORMER CUSTOM CLEANERS DES RI/FS - OPERABLE UNIT 2 IN MEMPHIS, TN

PARTIALLY EXERCISE CLINS 0003, 0010, AND 0014

ADD TASK 4C AND 4D

WCLD-RICHWOODS OU3, WCLD-RICHWOODS OU4, WCLD-OLD MINES OU3, WCLD-OLD MINES OU4, WCLD-POTOSI OU3 AND WCLD-POTOSI OU4 RI/FS RAF/DES. MOD P00012- CHANGE ORDER TO INCREASE LOE FOR ADDITIONAL FLOODPLAIN SAMPLES AND ADD ATOCOR

EXERCISE OPTIONS CONTRACT LINE ITEM NUMBERS 0002AC, 0003AC, 0004AC, 0005AB, 0006AC AND 0007AC FOR FORT BELVOIR RESTORATION, MILITARY MUNITIONS RESPONSE PROGRAM, COMPLIANCE CLEANUP PERFORMANCE-BASED ACQUISITION 23 FORT BELVOIR, VA

RAM LEATHER-REMEDIAL ACQUISITION FRAMEWORK (RAF) - INCREMENTALLY FUND TASK ORDER TO CLIN 0003/SUBTASK 3.1.2 BENCH SCALE TREATABILITY STUDY.

DES DOVER GAS LIGHT CO. REMEDIAL ACQUISITION FRAMEWORK (RAF), DESIGN AND ENGINEERING SERVICES (DES)