S.S. PAPADOPULOS & ASSOCIATES, INC.

GEOS4 SUPPORT FOR SOUTHEAST ROCKFORD GROUNDWATER CONTAMINATION SUPERFUND SITE SOURCE AREA 9/10; (SSID 05DK).

REGION 5, GROUNDWATER EVALUATION AND OPTIMIZATION SUPPORT (GEOS) PRIMARILY FOR SUPERFUND REMEDIAL PROJECT MANAGERS (RPMS). GEOS4 SUPPORT FOR FOREST WASTE PRODUCTS SUPERFUND SITE (SSID: 05D5).

MOD 13: INCREMENTAL FUNDING

GEOS4 CALL ORDER FOR REILLY TAR & CHEMICAL CORP., ST. LOUIS PARK PLANT (SSID: 0506).

GEOS4 SUPPORT FOR UNION CARBIDE, SITE B LANDFILL SUPERFUND SITE (SSID 05F4). MODIFICATION 1; EXERCISE OPTION PERIOD 1 AND ADMINISTRATIVE ACTION TO CHANGE THE INVOICE APPROVER AND ALTERNATE INVOICE APPROVER.

GARDEN CITY GROUNDWATER PLUME SUPERFUND SITE SUPPORT UNDER GEOS4 BPA. MODIFICATION 5; EXERCISE OPTION PERIOD 1.

ST. REGIS PAPER COMPANY SUPERFUND SITE (SSID 05J2); MODIFICATION 4; EXERCISE OPTION PERIOD 1.

GEOS4 SUPPORT FOR BENDIX CORP./ALLIED AUTOMOTIVE SUPERFUND SITE (SSID 05AS); MODIFICATION 4; EXERCISE OPTION PERIOD 1.

GEOS4 CALL ORDER FOR ACME SOLVENT RECLAIMING SUPERFUND SITE IN ROCKFORD ILLINOIS; SITE 0579. MODIFICATION 1; OBLIGATE FUNDS.

BPA CALL ORDER FOR THE (EAST PALESTINE TRAIN DERAILMENT EPTDR) SITE UNDER GEOS4 BPA#68HE0524A0002. MODIFICATION 2; EXTEND THE PERIOD OF PERFORMANCE.

SOUTHEAST ROCKFORD GROUNDWATER CONTAMINATION SUPERFUND SITE SITEWIDE SUPPORT UNDER GEOS4 BPA. MODIFICATION 2; EXERCISE OPTION PERIOD 1.

GARDEN CITY GROUNDWATER PLUME SUPERFUND SITE SUPPORT UNDER GEOS4 BPA. MODIFICATION 4; OBLIGATE FUNDS.

GEOS4 CALL ORDER FOR ACME SOLVENT RECLAIMING SUPERFUND SITE IN ROCKFORD ILLINOIS; SITE 0579.

MOD 12: DE-OB

THE PURPOSE OF THIS MODIFICATION IS TO EXERCISE OPTION YEAR 3 OF THE CONTRACT- PERIOD OF PERFORMANCE IS EXTENDED FROM 01 OCT 2025 TO 30 SEP 2026. CLINS 3001, 3004, AND 3006 ARE FULLY FUNDED- THE TOTAL AMOUNT OF THE ORDER IS INCREASED BY $171,616.38.

THE PURPOSE OF THIS MODIFICATION IS TO EXERCISE OPTION YEAR 2 OF THIS TASK ORDER- CLINS 2001 - 2005 ARE OBLIGATED IN THE TOTAL AMOUNT OF $123,414.56 AND PERIOD OF PERFORMANCE IS EXTENDED THROUGH 30 SEP 2025.

GEOS4 SUPPORT FOR UNION CARBIDE, SITE B LANDFILL SUPERFUND SITE (SSID 05F4).

MOD 11: INCREMENTAL FUNDING

MOD 10: INCREMENTAL FUNDING

MOD 09: EXERCISE OY2 WITH FUNDING & TASK COST REALIGNMENT_REV#5

SOUTHEAST ROCKFORD GROUNDWATER CONTAMINATION SUPERFUND SITE SITEWIDE SUPPORT UNDER GEOS4 BPA.

MOD 08: DE-OBLIGATION

EPA REGION 5 GROUNDWATER EVALUATION AND OPTIMIZATION SYSTEM TASK ORDER; MODIFICATION 56; DEOBLIGATE FUNDS

ST. REGIS PAPER COMPANY SUPERFUND SITE (SSID 05J2)

EPA REGION 5 GROUNDWATER EVALUATION AND OPTIMIZATION SYSTEM TASK ORDER; MODIFICATION 55; OBLIGATE FUNDS.

GEOS4 SUPPORT FOR BENDIX CORP./ALLIED AUTOMOTIVE SUPERFUND SITE (SSID 05AS)

MODIFICATION PS0005 IS ISSUED FOR THE PURCHASE OF ADDITIONAL WETLANDS NEEDED FOR THE DUNSEITH LAND PORT OF ENTRY CONSTRUCTION PROJECT IN DUNSEITH, ND

EXPERT WITNESS SERVICES

MODIFICATION PS0005 IS ISSUED FOR THE FY25 METRO WATER RECOVERY TASKS ASSOCIATED WITH THE WASTEWATER SAMPLING ON THE DENVER FEDERAL CENTER IN LAKEWOOD, COLORADO.

EXPERT WITNESS SERVICES

EXPERT WITNESS

EXPERT WITNESS SERVICES

BPA CALL ORDER FOR THE (EAST PALESTINE TRAIN DERAILMENT EPTDR) SITE UNDER GEOS4 BPA#68HE0524A0002.

GARDEN CITY GROUNDWATER PLUME SUPERFUND SITE SUPPORT UNDER GEOS4 BPA.

THE PURPOSE OF THIS MODIFICATION IS TO INCREASE THE CAPACITY OF CLIN CHEMICAL RECOVERY SUPERFUND SITE SSID: 0521 AND OBLIGATE FUNDS.

MOD PS0004 IS HEREBY ISSUED TO ADD $250,000.00 FOR CLIN 1001 AND 1004, FOR THE WORK TO BE DONE ON THE SE CORNER ON THE DENVER FEDERAL CENTER IN LAKEWOOD, COLORADO.

MODIFICATION PS0004 IS ISSUED FOR THE DRILLING OF WELLS IN DUNSIETH, NORTH DAKOTA AND TO ADD THE LONG TERM MONITORING PORTION TO THE TASK ORDER FOR REGION 8.

EXPERT WITNESS SERVICES

THE PURPOSE OF THIS MODIFICATION IS TO INCREASE THE CAPACITY OF CLIN SPRINGFIELD TOWNSHIP DUMP SUPERFUND SITE SSID: 05A7 AND OBLIGATE FUNDS.

THE PURPOSE OF THIS MODIFICATION IS TO INCREASE THE CAPACITY OF CLIN 0001AR, EAST PALESTINE TRAIN DERAILMENT SUPERFUND SITE (EPTD) AND OBLIGATE FUNDS.

THE PURPOSE OF THIS MODIFICATION IS TO DECREASE THE CAPACITY OF CLIN 0001AM, HAGEN FARM SUPERFUND SITE, DEOBLIGATE FUNDS, AND CLOSE OUT THE SITE.

EXPERT WITNESS

THE PURPOSE OF THIS MODIFICATION IS TO INCREASE THE CAPACITY OF CLIN 0001AN, SPRINGFIELD TOWNSHIP DUMP SUPERFUND SITE AND OBLIGATE FUNDS.

MT3D-USGS SOFTWARE MODERNIZATION

THE PURPOSE OF THIS MODIFICATION IS TO DEOBLIGATE FUNDS IN THE AMOUNT OF $1,573.07 FROM CLIN 0001AK.

THE PURPOSE OF THIS MODIFICATION IS TO OBLIGATE FUNDS IN THE AMOUNT OF $69,709 AND INCORPORATE NEW CLIN 0001AR, EAST PALESTINE TRAIN DERAILMENT SITE.

MODIFICATION PS0003 IS FOR ADDITIONAL FUNDING TO COMPLETE WCR 08 FOR THE GEO THERMAL WELLS IN THE AMOUNT OF $20,000.00. CLIN 0004 IS INCREASED BY $20,0000.00. THE TASK ORDER IS INCREASED BY $20,000.00 FROM $1,282,967.81 TO $1,302,967.81.

STIBNITE GOLD PROJECT HYDROLOGIC REVIEW THE PURPOSE OF THIS MODIFICATION IS TO DEOBLIGATE $30,997.02 IN REMAINING FUNDS FROM THE TASK ORDER. ALL SERVICES HAVE BEEN COMPLETED AND ALL INVOICES HAVE BEEN PROCESSED. THIS DEOBLIGATION MODIFICATION WI

MOD IS TO DEOBLIGATE AND RECONCILE REMAINING FUNDS FOR CONTRACT CLOSEOUT

MOD; EXERCISE OY1