SEVENSON ENVIRONMENTAL SERVICES, INC.

FORMER KIL-TONE OU2 PHASE 1 - DEFINITIZE WVNS 9-14

WACC SUPERFUND OU1 REMEDIAL ACTION

THE PURPOSE OF THIS MODIFICATION IS TO SUPPORT SCOPE GROWTH

NW009 QTY VAR CLIN 0017 CONTRACT FOR WYCKOFF DEBRIS REMOVAL & WALL REPLACEMENT AT BAINBRIDGE ISLAND, WA AT BAINBRIDGE ISLAND, WA REFERENCE NO. R00007

REMEDIATION SERVICES CONTRACT AT RAYMARK SUPERFUND SITE IN STRATFORD, CT

REMEDIATION SERVICES FOR FERRY CREEK (OU3) AND ADDITIONAL OU6 PROPERTIES AT RAYMARK SUPERFUND SITE IN STRATFORD, CONNECTICUT

GENERAL CONDITIONS TASK ORDER, RAYMARK SUPERFUND SITE, STRATFORD, CT

WACC SUPERFUND OU1 REMEDIAL ACTION

SEED TASK ORDER FOR REMEDIAL ACTION CONTRACT (RAC) FOR EXCAVATION OF WASTE CONTAMINATED SOILS AND SEDIMENTS AT THE RAYMARK SUPERFUND SITE IN STRATFORD, CT

REMEDIATION SERVICES FOR FERRY CREEK (OU3) AND ADDITIONAL OU6 PROPERTIES AT RAYMARK SUPERFUND SITE IN STRATFORD, CONNECTICUT

GENERAL CONDITIONS TASK ORDER AT RAYMARK SUPERFUND SITE IN STRATFORD, CONNECTICUT

REMEDIATION SERVICES FOR FERRY CREEK (OU3) AND ADDITIONAL OU6 PROPERTIES AT RAYMARK SUPERFUND SITE IN STRATFORD, CONNECTICUT

DIAMOND HEAD OU1 AND OU2 REMEDIAL ACTION MODIFICATION FOR SUPPLEMENTAL INVESTIGATION

MODIFICATION P00013 IS TO EXERCISE CLIN 0015.

THE PURPOSE OF THIS BILATERAL MODIFICATION IS TO DE-OBLIGATE $100,000.00 FROM LINE ITEM 0001.

DIAMOND HEAD OU1 AND OU2 REMEDIAL ACTION TO DEFINITIZE WVNS 11 THROUGH 16.

NW005 TEMP FENCING & RIP RAP CONTRACT FOR WYCKOFF DEBRIS REMOVAL & WALL REPLACEMENT AT BAINBRIDGE ISLAND, WA AT BAINBRIDGE ISLAND, WA REFERENCE NO. R00006

WACC SUPERFUND OU1 REMEDIAL ACTION

19M - NCBC GULFPORT SITE 7 REMEDIAL ACTION

NW003 TILTMETER CABLE CONTRACT FOR WYCKOFF DEBRIS REMOVAL & WALL REPLACEMENT AT BAINBRIDGE ISLAND, WA AT BAINBRIDGE ISLAND, WA REFERENCE NO. R00005

NW002 QAPP/SAP REQUIREMENTS CONTRACT FOR WYCKOFF DEBRIS REMOVAL & WALL REPLACEMENT AT BAINBRIDGE ISLAND, WA AT BAINBRIDGE ISLAND, WA REFERENCE NO. R00003

WVN 6

OPTION 13

GENERAL CONDITIONS TASK ORDER #4 AT RAYMARK SUPERFUND SITE IN STRATFORD, CONNECTICUT

FY25 - MODIFICATION LTM, LTO, FYR BRAC FORMER NAS CECIL

FORMER KIL-TONE OU2 PHASE 1 - WVN 8

REMEDIATION SERVICES FOR FERRY CREEK (OU3) AND ADDITIONAL OU6 PROPERTIES AT RAYMARK SUPERFUND SITE IN STRATFORD, CONNECTICUT

GENERAL CONDITIONS TASK ORDER AT RAYMARK SUPERFUND SITE IN STRATFORD, CONNECTICUT

WACC SUPERFUND OU1 REMEDIAL ACTION

FORMER KIL-TONE OU2 PHASE 1 - WVN 7

EXCAVATION

FORMER KIL-TONE OU2 PHASE 1 - MODIFICATION FOR WVN 6

CUYAHOGA GORGE DAM SEDIMENT REMEDIATION - GLNPO - TASK ORDER AWARD UNDER GLNPO-RRS MATOC

GREAT LAKES NATIONAL PROGRAM OFFICE - REMEDIATION AND RESTORATION SERVICES (GLNPO-RRS) II SEVENSON ENVIRONMENTAL SERVICES, INC INDEFINITE DELIVERY INDEFINITE QUANTITY CONTRACT ONE OF FOUR MULTIPLE AWARDS

FORMER KIL-TONE OU1 PHASE 3 WVNS 0032

REMEDIATION SERVICES FOR FERRY CREEK AND ADDITIONAL PROPERTIES AT RAYMARK SUPERFUND SITE IN STRATFORD, CONNECTICUT

FORMER KIL-TONE OU2 PHASE 1 - MODIFICATION TO INCORPORATE WVN 5.

DIAMOND HEAD OU1 AND OU2 REMEDIAL ACTION

GENERAL CONDITIONS TASK ORDER, RAYMARK SUPERFUND SITE, STRATFORD, CONNECTICUT

MODIFICATION RES SCORPIO RECYCLING OU2 REMEDIAL ACTION

FORMER KIL-TONE OU2 PHASE 1 - DEFINITIZE WVN 1 AND 4.

REMEDIATION SERVICES FOR FERRY CREEK AND ADDITIONAL PROPERTIES AT RAYMARK SUPERFUND SITE IN STRATFORD, CONNECTICUT

FORMER KIL-TONE OU1 PHASE 3 WVNS 023-026

SEED TASK ORDER - MOBILIZATION AND REMEDIATION SERVICES AT FORMER DUPONT CHAMBERS WORKS FUSRAP IN DEEPWATER, NJ

FORMER KIL-TONE OU2 PHASE 1

FORMER KIL-TONE OU1 PHASE 3 WVNS 030 AND 031

GENERAL CONDITIONS TASK ORDER, RAYMARK SUPERFUND SITE, STRATFORD, CT

DIAMOND HEAD OU1 AND OU2 REMEDIAL ACTION

FORMER KIL-TONE OU2 PHASE 1 - WVN 2

RES SCORPIO RECYCLING OU2 REMEDIAL ACTION