Tetra Tech, INC.

UEI J8CNBANBZ6U8 · CA · subsidiary of Tetra Tech, INC. · SAM.gov record ↗

$26.3M

FY2025 obligations

Contract awards

Sep 25, 2022

First action

Aug 2, 2026

Latest action

Obligations by agency

Environmental Protection Agency$25.9M
Department Of Transportation$277K
Department Of Defense$165K

Obligations by NAICS

Monthly obligations

Oct 24

Nov 24

Jan 25

Feb 25

Mar 25

Apr 25

May 25

Jun 25

Jul 25

Aug 25

Sep 25

Oct 25

Dec 25

Jan 26

Feb 26

Mar 26

Apr 26

May 26

Jun 26

Jul 26

Aug 26

Contracts ending within 18 months (recompete watch)

68HE0923F0051 ↗$6.0M
THE PURPOSE OF THIS BILATERAL MOD IS TO ADD SCOPE AND FUNDING TO CONDUCT EE/CAS IN NAVAJO NATION'S NORTHERN AGENCY. THIS IS A MOD 3 FOR TO 07 UNDER RAES 2 CONTRACT #68HE0923D0002.
Ends
Nov 18, 2026
Started
Jul 19, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0924F0004 ↗$1.4M
THE PURPOSE OF MODIFICATION P00005 IS TO ADD NEW TASKS AND ADD ADDITIONAL FUNDING FOR THE RSE AT THE SKYLINE AUM UNDER THE RAES II CONTRACT FOR EPA FOR REGIONS 6 & 9.
Ends
Dec 30, 2026
Started
Nov 21, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0072 ↗$1.9M
THE PURPOSE OF THIS BILATERAL MODIFICATION IS TO ADD SCOPE AND FUNDING TO TO 16 UNDER RAES 2 CONTRACT #68HE0923D0002.
Ends
Dec 30, 2026
Started
Aug 15, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0925F0048 ↗$1.3M
THE PURPOSE OF THIS TASK ORDER IS ESTABLISH A TASK ORDER 27 TO PROVIDE TECHNICAL SUPPORT TO REGION 6 FOR OVERSIGHT OF AN ONGOING PRP RI/FS AND GOVERNMENT RI/FS AT THE HOMESTAKE MINING COMPANY UNDER THE RAES 2 CONTRACT.
Ends
Apr 30, 2027
Started
Jun 1, 2025
Agency
Environmental Protection Agency
NAICS
541620
68HE0925F0054 ↗$50K
TO 29 IS TO TO PROVIDE TECHNICAL ASSISTANCE FOR OVERSIGHT OF THE POTENTIALLY RESPONSIBLE PARTY (PRP) BNSF RAILWAY COMPANY (BNSF) AS THEY PERFORM A BACKGROUND STUDY, DATA GAPS ANALYSIS AND ENGINEERING EVALUATIONS/COST ANALYSES (EE/CA).
Ends
Jun 29, 2027
Started
Jun 30, 2025
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0049 ↗$907K
THE PURPOSE OF THIS BILATERAL MOD IS TO EXTEND THE POP, CHANGE ALTERNATE TOCORS, AND ADD FUNDS. THE CONTRACTOR PROVIDES TA FOR DATA AND RECORDS MANAGEMENT RELATED TO THE NAVAJO AUM PROGRAM. THIS IS MOD P00002, TASK ORDER 6 FOR THE RAES 2 CONTRACT, #6
Ends
Jul 11, 2027
Started
Jul 11, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0925F0051 ↗$540K
THE PURPOSE OF THIS TASK ORDER IS TO PROVIDE TECHNICAL SUPPORT TO EPA REGION 6 IN FULFILLMENT OF ITS RESPONSIBILITIES FOR OVERSIGHT AND ENFORCEMENT OF ARCO'S ONGOING RI/FS UNDER THE ASAOC AND TO ASSIST EPA IN COORDINATION AND COMMUNICATION WITH
Ends
Aug 3, 2027
Started
Aug 5, 2025
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0067 ↗$50K
THE PURPOSE OF THIS UNILATERAL MOD IS TO ADD INCREMENTAL FUNDING. THE CONTRACTOR SHALL PROVIDE TECH ASSIST, FOR OVERSIGHT OF PRP AS THEY PERFORM AN EE/CA FOR THE MAC & BLACKJACK MINES FOR CONTRACT 68HE0923D0002, THE (RAES)II FOR EPA FOR RGNS 6 AN
Ends
Aug 8, 2027
Started
Aug 9, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0066 ↗$0
THE PURPOSE OF THIS NO-COST BILATERAL MODIFICATION P00001 IS TO EXTEND THE PERIOD OF PERFORMANCE
Ends
Aug 8, 2027
Started
Aug 8, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0068 ↗$0
THE PURPOSE OF THIS UNILATERAL MOD IS TO CHANGE THE PRIMARY TOCOR. CONTRACTOR PROVIDES ASSISTANCE FOR OVERSIGHT OF THE PRP - WESTERN NUCLEAR AS THEY PERFORM EE/CAS AND RAS IN THE MARIANO LAKE AREA OF THE EASTERN AGENCY NAVAJO NATION.
Ends
Aug 9, 2027
Started
Aug 10, 2023
Agency
Environmental Protection Agency
NAICS
541620

PIID	Description	Agency	NAICS	Obligated	Start	End
68HE0923F0051 ↗	THE PURPOSE OF THIS BILATERAL MOD IS TO ADD SCOPE AND FUNDING TO CONDUCT EE/CAS IN NAVAJO NATION'S NORTHERN AGENCY. THIS IS A MOD 3 FOR TO 07 UNDER RAES 2 CONTRACT #68HE0923D0002.	Environmental Protection Agency	541620	$6.0M	Jul 19, 2023	Nov 18, 2026
68HE0924F0004 ↗	THE PURPOSE OF MODIFICATION P00005 IS TO ADD NEW TASKS AND ADD ADDITIONAL FUNDING FOR THE RSE AT THE SKYLINE AUM UNDER THE RAES II CONTRACT FOR EPA FOR REGIONS 6 & 9.	Environmental Protection Agency	541620	$1.4M	Nov 21, 2023	Dec 30, 2026
68HE0923F0072 ↗	THE PURPOSE OF THIS BILATERAL MODIFICATION IS TO ADD SCOPE AND FUNDING TO TO 16 UNDER RAES 2 CONTRACT #68HE0923D0002.	Environmental Protection Agency	541620	$1.9M	Aug 15, 2023	Dec 30, 2026
68HE0925F0048 ↗	THE PURPOSE OF THIS TASK ORDER IS ESTABLISH A TASK ORDER 27 TO PROVIDE TECHNICAL SUPPORT TO REGION 6 FOR OVERSIGHT OF AN ONGOING PRP RI/FS AND GOVERNMENT RI/FS AT THE HOMESTAKE MINING COMPANY UNDER THE RAES 2 CONTRACT.	Environmental Protection Agency	541620	$1.3M	Jun 1, 2025	Apr 30, 2027
68HE0925F0054 ↗	TO 29 IS TO TO PROVIDE TECHNICAL ASSISTANCE FOR OVERSIGHT OF THE POTENTIALLY RESPONSIBLE PARTY (PRP) BNSF RAILWAY COMPANY (BNSF) AS THEY PERFORM A BACKGROUND STUDY, DATA GAPS ANALYSIS AND ENGINEERING EVALUATIONS/COST ANALYSES (EE/CA).	Environmental Protection Agency	541620	$50K	Jun 30, 2025	Jun 29, 2027
68HE0923F0049 ↗	THE PURPOSE OF THIS BILATERAL MOD IS TO EXTEND THE POP, CHANGE ALTERNATE TOCORS, AND ADD FUNDS. THE CONTRACTOR PROVIDES TA FOR DATA AND RECORDS MANAGEMENT RELATED TO THE NAVAJO AUM PROGRAM. THIS IS MOD P00002, TASK ORDER 6 FOR THE RAES 2 CONTRACT, #6	Environmental Protection Agency	541620	$907K	Jul 11, 2023	Jul 11, 2027
68HE0925F0051 ↗	THE PURPOSE OF THIS TASK ORDER IS TO PROVIDE TECHNICAL SUPPORT TO EPA REGION 6 IN FULFILLMENT OF ITS RESPONSIBILITIES FOR OVERSIGHT AND ENFORCEMENT OF ARCO'S ONGOING RI/FS UNDER THE ASAOC AND TO ASSIST EPA IN COORDINATION AND COMMUNICATION WITH	Environmental Protection Agency	541620	$540K	Aug 5, 2025	Aug 3, 2027
68HE0923F0067 ↗	THE PURPOSE OF THIS UNILATERAL MOD IS TO ADD INCREMENTAL FUNDING. THE CONTRACTOR SHALL PROVIDE TECH ASSIST, FOR OVERSIGHT OF PRP AS THEY PERFORM AN EE/CA FOR THE MAC & BLACKJACK MINES FOR CONTRACT 68HE0923D0002, THE (RAES)II FOR EPA FOR RGNS 6 AN	Environmental Protection Agency	541620	$50K	Aug 9, 2023	Aug 8, 2027
68HE0923F0066 ↗	THE PURPOSE OF THIS NO-COST BILATERAL MODIFICATION P00001 IS TO EXTEND THE PERIOD OF PERFORMANCE	Environmental Protection Agency	541620	$0	Aug 8, 2023	Aug 8, 2027
68HE0923F0068 ↗	THE PURPOSE OF THIS UNILATERAL MOD IS TO CHANGE THE PRIMARY TOCOR. CONTRACTOR PROVIDES ASSISTANCE FOR OVERSIGHT OF THE PRP - WESTERN NUCLEAR AS THEY PERFORM EE/CAS AND RAS IN THE MARIANO LAKE AREA OF THE EASTERN AGENCY NAVAJO NATION.	Environmental Protection Agency	541620	$0	Aug 10, 2023	Aug 9, 2027

Largest awards

68HE0923F0051 ↗$6.0M
THE PURPOSE OF THIS BILATERAL MOD IS TO ADD SCOPE AND FUNDING TO CONDUCT EE/CAS IN NAVAJO NATION'S NORTHERN AGENCY. THIS IS A MOD 3 FOR TO 07 UNDER RAES 2 CONTRACT #68HE0923D0002.
Ends
Nov 18, 2026
Started
Jul 19, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0071 ↗$5.1M
THE PURPOSE OF THIS BILATERAL MOD IS TO INCORPORATE A REVISED SOW AND KTR WORK PLAN, INCREASE THE LOE FOR A FEW TASKS, AND ADD A NEW ALTERNATE TOCOR. THIS IS MOD P00005 FOR TO 15 THAT PROVIDES SUPPORT FOR NAUM PROGRAM TO DEVELOP PROGRAM STANDARDS UND
Ends
Apr 7, 2028
Started
Sep 11, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0074 ↗$3.3M
THE PURPOSE OF THIS UNILATERAL ADMINISTRATIVE MODIFICATION IS TO CORRECT LINE ITEM POPS. THE CONTRACTOR SHALL PROVIDE THE SUPPORT NEEDED FOR INTERIM ACTIONS AT TRONOX AUMS UNDER THE RAES II CONTRACT #68HE0923D0002 FOR EPA FOR REGIONS 6 AND 9. MOD P00
Ends
Sep 29, 2026
Started
Sep 28, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0073 ↗$2.2M
THE PURPOSE OF THIS UNILATERAL MOD IS TO ADD INCREMENTAL FUNDING. CONTRACTOR SHALL PROVIDE TECHNICAL DESIGN SERVICES FOR PLANNING & CONDUCTING CLEANUP VERIFICATION UNDER THE RAES 2 CONTRACT #68HE0923D0002 FOR REGIONS 6 & 9.
Ends
Jul 31, 2026
Started
Sep 17, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0072 ↗$1.9M
THE PURPOSE OF THIS BILATERAL MODIFICATION IS TO ADD SCOPE AND FUNDING TO TO 16 UNDER RAES 2 CONTRACT #68HE0923D0002.
Ends
Dec 30, 2026
Started
Aug 15, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0924F0004 ↗$1.4M
THE PURPOSE OF MODIFICATION P00005 IS TO ADD NEW TASKS AND ADD ADDITIONAL FUNDING FOR THE RSE AT THE SKYLINE AUM UNDER THE RAES II CONTRACT FOR EPA FOR REGIONS 6 & 9.
Ends
Dec 30, 2026
Started
Nov 21, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0925F0048 ↗$1.3M
THE PURPOSE OF THIS TASK ORDER IS ESTABLISH A TASK ORDER 27 TO PROVIDE TECHNICAL SUPPORT TO REGION 6 FOR OVERSIGHT OF AN ONGOING PRP RI/FS AND GOVERNMENT RI/FS AT THE HOMESTAKE MINING COMPANY UNDER THE RAES 2 CONTRACT.
Ends
Apr 30, 2027
Started
Jun 1, 2025
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0049 ↗$907K
THE PURPOSE OF THIS BILATERAL MOD IS TO EXTEND THE POP, CHANGE ALTERNATE TOCORS, AND ADD FUNDS. THE CONTRACTOR PROVIDES TA FOR DATA AND RECORDS MANAGEMENT RELATED TO THE NAVAJO AUM PROGRAM. THIS IS MOD P00002, TASK ORDER 6 FOR THE RAES 2 CONTRACT, #6
Ends
Jul 11, 2027
Started
Jul 11, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0045 ↗$852K
THE PURPOSE OF THIS UNILATERAL MODIFICATION IS TO EXTEND THE POP. TO IS FOR TIME-CRITICAL REMOVAL ACTION (TCRA) PLANNING AND OVERSIGHT SUPPORT ASSOCIATED WITH THE OLD CHURCH ROCK MINE SITE, AS WELL AS PLANNING AND SCOPING FOR A NON-TIME CRITICAL REMO
Ends
Sep 29, 2026
Started
Jun 6, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0070 ↗$746K
THE PURPOSE OF THIS UNILATERAL MOD IS TO ADD SCOPE AND DOGE APPROVED FUNDING. THE CONTRACTOR SHALL PROVIDE EVALUATIONS FOR KNOWN 278 UNFUNDED AUMS ON THE NAVAJO NATION UNDER RAES II FOR EPA FOR REGIONS 6 & 9.
Ends
Sep 12, 2026
Started
Sep 12, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0924F0017 ↗$647K
THE PURPOSE OF THIS NO-COST MODIFICATION IS TO EXTEND THE PERIOD OF PERFORMANCE FOR R6 SCMB- TO 23 - NAVAJO NATION AUM RESPONSE ASSESSMENT AND EVALUATION SERVICES (RAES) II FOR EPA FOR REGIONS 6 & 9.
Ends
Apr 8, 2028
Started
May 12, 2024
Agency
Environmental Protection Agency
NAICS
541620
68HE0925F0051 ↗$540K
THE PURPOSE OF THIS TASK ORDER IS TO PROVIDE TECHNICAL SUPPORT TO EPA REGION 6 IN FULFILLMENT OF ITS RESPONSIBILITIES FOR OVERSIGHT AND ENFORCEMENT OF ARCO'S ONGOING RI/FS UNDER THE ASAOC AND TO ASSIST EPA IN COORDINATION AND COMMUNICATION WITH
Ends
Aug 3, 2027
Started
Aug 5, 2025
Agency
Environmental Protection Agency
NAICS
541620
697DCK25C00133 ↗$277K
ENVIRONMENTAL ASSESSMENT REPLACEMENT OF THE AIR ROUTE SURVEILLANCE RADAR (ARSR) ON MT. KA`ALA, OAHU, HAWAII
Ends
Aug 31, 2026
Started
Apr 27, 2025
Agency
Federal Aviation Administration
NAICS
541715
68HE0923F0077 ↗$268K
THE PURPOSE OF NO COST BILATERAL MODIFICATION P00003 IS TO EXTEND THE POP. CONTRACTOR SHALL PROVIDE SUPPORT FOR NTCRA PLANNING & OVERSIGHT SUPT ASSOCIATED W/ENPRO HOLDINGS ON NAVAJO NATION UNDER THE RAES2 CONTRACT #68HE0923D0002.
Ends
Apr 29, 2028
Started
Sep 17, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0048 ↗$231K
THE PURPOSE OF THIS UNILATERAL MOD IS TO EXTEND THE POP. THE CONTRACTOR SUPPORTS AGENCY OVERSITE OF RSES,, INTERIM RAS, WATER STUDIES, EE/CAS, AND RAS AUMS IN THE PHASE 2 EXPANDED TRUST AGREEMENT UNDER THE RAES 2 CONTRACT.
Ends
Jun 5, 2028
Started
Jun 6, 2023
Agency
Environmental Protection Agency
NAICS
541620
W9123823F0036 ↗$165K
REA MODIFICATION
Ends
Jun 23, 2025
Started
Aug 1, 2023
Agency
Department Of The Army
NAICS
562910
68HE0923F0042 ↗$114K
THE PURPOSE OF THIS BILATERAL MOD ADDS SCOPE, FUNDING, AND TWO (2) OPTION YEARS. THE CONTRACTOR WILL ASSIST EPA IN COMMUNITY INVOLVEMENT OUTREACH SUPPORT INCLUDING CALLS, REMOTE MEETINGS AND FACE TO FACE ASSEMBLIES UNDER THE RAES 2 CONTRACT #68HE0092
Ends
Apr 8, 2028
Started
May 31, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0061 ↗$97K
THE PURPOSE OF THIS BILATERAL MODIFICATION EXTEND THE POP AND ADD UPDATED UAV MEMO. TO FOR UAV SUPPORT ON NAVAJO NATION IN ACCORDANCE UNDER THE RAES2 CONTRACT #68HE0923D0002 FOR EPA FOR REGIONS 6 & 9.
Ends
Apr 8, 2028
Started
Jul 24, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0925F0047 ↗$97K
THE CONTRACTOR SHALL PERFORM OVERSITE AND TECHNICAL REVIEW FOR REMOVAL SITE EVALUATIONS (RSE) AND RISK ASSESSMENT DOCUMENTS FOR WELLS CARGO ABANDONED URANIUM MINES (AUMS) UNDER THE RAES 2 CONTRACT 68HE0923D0002.
Ends
Apr 29, 2028
Started
Apr 22, 2025
Agency
Environmental Protection Agency
NAICS
541620
68HE0925F0054 ↗$50K
TO 29 IS TO TO PROVIDE TECHNICAL ASSISTANCE FOR OVERSIGHT OF THE POTENTIALLY RESPONSIBLE PARTY (PRP) BNSF RAILWAY COMPANY (BNSF) AS THEY PERFORM A BACKGROUND STUDY, DATA GAPS ANALYSIS AND ENGINEERING EVALUATIONS/COST ANALYSES (EE/CA).
Ends
Jun 29, 2027
Started
Jun 30, 2025
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0067 ↗$50K
THE PURPOSE OF THIS UNILATERAL MOD IS TO ADD INCREMENTAL FUNDING. THE CONTRACTOR SHALL PROVIDE TECH ASSIST, FOR OVERSIGHT OF PRP AS THEY PERFORM AN EE/CA FOR THE MAC & BLACKJACK MINES FOR CONTRACT 68HE0923D0002, THE (RAES)II FOR EPA FOR RGNS 6 AN
Ends
Aug 8, 2027
Started
Aug 9, 2023
Agency
Environmental Protection Agency
NAICS
541620
W912PP22D0018 ↗$0
MEGA ENVIRONMENTAL REMEDIATION SERVICES. MOD EXERCISES OPTION PERIOD.
Ends
—
Started
Sep 25, 2022
Agency
Department Of The Army
NAICS
562910
68HE0924F0001 ↗$0
THE PURPOSE OF THIS UNILATERAL MODIFICATION IS TO EXTEND THE POP. THE CONTRACTOR SHALL SUPPORT DEVELOPMENT OF THE FEDERAL ACTIONS TO ADDRESS IMPACTS OF URANIUM CONTAMINATION IN THE NAVAJO NATION 2020-2029 (TEN-YEAR PLAN) UNDER THE RAES 2 CONTRACT #68
Ends
Jun 11, 2026
Started
Nov 1, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0923F0069 ↗$0
THE PURPOSE OF THIS UNILATERAL MODIFICATION IS TO ADD ATOCOR FOR THIS TO FOR THE REMOVAL SITE EVALUATIONS (RSES) AT THE ABANDONED URANIUM MINES (AUMS) AND MINE AREAS NAMED IN THE CYPRUS AMAX MINERALS COMPANY UNDER THE RAES 2 CONTRACT # 68HE0923D0002.
Ends
Aug 13, 2026
Started
Aug 14, 2023
Agency
Environmental Protection Agency
NAICS
541620
68HE0924F0055 ↗$0
THE PURPOSE OF THIS UNILATERAL MODIFICATION IS TO EXTEND THE POP. THE CONTRACTOR SHALL PROVIDE TECHNICAL ASSISTANCE TO USEPA FOR TECHNICAL ASSISTANCE TO THE CONTAMINATED STRUCTURES PROGRAM UNDER THE RAES 2 CONTRACT.
Ends
Sep 29, 2026
Started
Jun 25, 2024
Agency
Environmental Protection Agency
NAICS
541620

PIID	Description	Agency	NAICS	Obligated	Start	End
68HE0923F0051 ↗	THE PURPOSE OF THIS BILATERAL MOD IS TO ADD SCOPE AND FUNDING TO CONDUCT EE/CAS IN NAVAJO NATION'S NORTHERN AGENCY. THIS IS A MOD 3 FOR TO 07 UNDER RAES 2 CONTRACT #68HE0923D0002.	Environmental Protection Agency	541620	$6.0M	Jul 19, 2023	Nov 18, 2026
68HE0923F0071 ↗	THE PURPOSE OF THIS BILATERAL MOD IS TO INCORPORATE A REVISED SOW AND KTR WORK PLAN, INCREASE THE LOE FOR A FEW TASKS, AND ADD A NEW ALTERNATE TOCOR. THIS IS MOD P00005 FOR TO 15 THAT PROVIDES SUPPORT FOR NAUM PROGRAM TO DEVELOP PROGRAM STANDARDS UND	Environmental Protection Agency	541620	$5.1M	Sep 11, 2023	Apr 7, 2028
68HE0923F0074 ↗	THE PURPOSE OF THIS UNILATERAL ADMINISTRATIVE MODIFICATION IS TO CORRECT LINE ITEM POPS. THE CONTRACTOR SHALL PROVIDE THE SUPPORT NEEDED FOR INTERIM ACTIONS AT TRONOX AUMS UNDER THE RAES II CONTRACT #68HE0923D0002 FOR EPA FOR REGIONS 6 AND 9. MOD P00	Environmental Protection Agency	541620	$3.3M	Sep 28, 2023	Sep 29, 2026
68HE0923F0073 ↗	THE PURPOSE OF THIS UNILATERAL MOD IS TO ADD INCREMENTAL FUNDING. CONTRACTOR SHALL PROVIDE TECHNICAL DESIGN SERVICES FOR PLANNING & CONDUCTING CLEANUP VERIFICATION UNDER THE RAES 2 CONTRACT #68HE0923D0002 FOR REGIONS 6 & 9.	Environmental Protection Agency	541620	$2.2M	Sep 17, 2023	Jul 31, 2026
68HE0923F0072 ↗	THE PURPOSE OF THIS BILATERAL MODIFICATION IS TO ADD SCOPE AND FUNDING TO TO 16 UNDER RAES 2 CONTRACT #68HE0923D0002.	Environmental Protection Agency	541620	$1.9M	Aug 15, 2023	Dec 30, 2026
68HE0924F0004 ↗	THE PURPOSE OF MODIFICATION P00005 IS TO ADD NEW TASKS AND ADD ADDITIONAL FUNDING FOR THE RSE AT THE SKYLINE AUM UNDER THE RAES II CONTRACT FOR EPA FOR REGIONS 6 & 9.	Environmental Protection Agency	541620	$1.4M	Nov 21, 2023	Dec 30, 2026
68HE0925F0048 ↗	THE PURPOSE OF THIS TASK ORDER IS ESTABLISH A TASK ORDER 27 TO PROVIDE TECHNICAL SUPPORT TO REGION 6 FOR OVERSIGHT OF AN ONGOING PRP RI/FS AND GOVERNMENT RI/FS AT THE HOMESTAKE MINING COMPANY UNDER THE RAES 2 CONTRACT.	Environmental Protection Agency	541620	$1.3M	Jun 1, 2025	Apr 30, 2027
68HE0923F0049 ↗	THE PURPOSE OF THIS BILATERAL MOD IS TO EXTEND THE POP, CHANGE ALTERNATE TOCORS, AND ADD FUNDS. THE CONTRACTOR PROVIDES TA FOR DATA AND RECORDS MANAGEMENT RELATED TO THE NAVAJO AUM PROGRAM. THIS IS MOD P00002, TASK ORDER 6 FOR THE RAES 2 CONTRACT, #6	Environmental Protection Agency	541620	$907K	Jul 11, 2023	Jul 11, 2027
68HE0923F0045 ↗	THE PURPOSE OF THIS UNILATERAL MODIFICATION IS TO EXTEND THE POP. TO IS FOR TIME-CRITICAL REMOVAL ACTION (TCRA) PLANNING AND OVERSIGHT SUPPORT ASSOCIATED WITH THE OLD CHURCH ROCK MINE SITE, AS WELL AS PLANNING AND SCOPING FOR A NON-TIME CRITICAL REMO	Environmental Protection Agency	541620	$852K	Jun 6, 2023	Sep 29, 2026
68HE0923F0070 ↗	THE PURPOSE OF THIS UNILATERAL MOD IS TO ADD SCOPE AND DOGE APPROVED FUNDING. THE CONTRACTOR SHALL PROVIDE EVALUATIONS FOR KNOWN 278 UNFUNDED AUMS ON THE NAVAJO NATION UNDER RAES II FOR EPA FOR REGIONS 6 & 9.	Environmental Protection Agency	541620	$746K	Sep 12, 2023	Sep 12, 2026
68HE0924F0017 ↗	THE PURPOSE OF THIS NO-COST MODIFICATION IS TO EXTEND THE PERIOD OF PERFORMANCE FOR R6 SCMB- TO 23 - NAVAJO NATION AUM RESPONSE ASSESSMENT AND EVALUATION SERVICES (RAES) II FOR EPA FOR REGIONS 6 & 9.	Environmental Protection Agency	541620	$647K	May 12, 2024	Apr 8, 2028
68HE0925F0051 ↗	THE PURPOSE OF THIS TASK ORDER IS TO PROVIDE TECHNICAL SUPPORT TO EPA REGION 6 IN FULFILLMENT OF ITS RESPONSIBILITIES FOR OVERSIGHT AND ENFORCEMENT OF ARCO'S ONGOING RI/FS UNDER THE ASAOC AND TO ASSIST EPA IN COORDINATION AND COMMUNICATION WITH	Environmental Protection Agency	541620	$540K	Aug 5, 2025	Aug 3, 2027
697DCK25C00133 ↗	ENVIRONMENTAL ASSESSMENT REPLACEMENT OF THE AIR ROUTE SURVEILLANCE RADAR (ARSR) ON MT. KA`ALA, OAHU, HAWAII	Federal Aviation Administration	541715	$277K	Apr 27, 2025	Aug 31, 2026
68HE0923F0077 ↗	THE PURPOSE OF NO COST BILATERAL MODIFICATION P00003 IS TO EXTEND THE POP. CONTRACTOR SHALL PROVIDE SUPPORT FOR NTCRA PLANNING & OVERSIGHT SUPT ASSOCIATED W/ENPRO HOLDINGS ON NAVAJO NATION UNDER THE RAES2 CONTRACT #68HE0923D0002.	Environmental Protection Agency	541620	$268K	Sep 17, 2023	Apr 29, 2028
68HE0923F0048 ↗	THE PURPOSE OF THIS UNILATERAL MOD IS TO EXTEND THE POP. THE CONTRACTOR SUPPORTS AGENCY OVERSITE OF RSES,, INTERIM RAS, WATER STUDIES, EE/CAS, AND RAS AUMS IN THE PHASE 2 EXPANDED TRUST AGREEMENT UNDER THE RAES 2 CONTRACT.	Environmental Protection Agency	541620	$231K	Jun 6, 2023	Jun 5, 2028
W9123823F0036 ↗	REA MODIFICATION	Department Of The Army	562910	$165K	Aug 1, 2023	Jun 23, 2025
68HE0923F0042 ↗	THE PURPOSE OF THIS BILATERAL MOD ADDS SCOPE, FUNDING, AND TWO (2) OPTION YEARS. THE CONTRACTOR WILL ASSIST EPA IN COMMUNITY INVOLVEMENT OUTREACH SUPPORT INCLUDING CALLS, REMOTE MEETINGS AND FACE TO FACE ASSEMBLIES UNDER THE RAES 2 CONTRACT #68HE0092	Environmental Protection Agency	541620	$114K	May 31, 2023	Apr 8, 2028
68HE0923F0061 ↗	THE PURPOSE OF THIS BILATERAL MODIFICATION EXTEND THE POP AND ADD UPDATED UAV MEMO. TO FOR UAV SUPPORT ON NAVAJO NATION IN ACCORDANCE UNDER THE RAES2 CONTRACT #68HE0923D0002 FOR EPA FOR REGIONS 6 & 9.	Environmental Protection Agency	541620	$97K	Jul 24, 2023	Apr 8, 2028
68HE0925F0047 ↗	THE CONTRACTOR SHALL PERFORM OVERSITE AND TECHNICAL REVIEW FOR REMOVAL SITE EVALUATIONS (RSE) AND RISK ASSESSMENT DOCUMENTS FOR WELLS CARGO ABANDONED URANIUM MINES (AUMS) UNDER THE RAES 2 CONTRACT 68HE0923D0002.	Environmental Protection Agency	541620	$97K	Apr 22, 2025	Apr 29, 2028
68HE0925F0054 ↗	TO 29 IS TO TO PROVIDE TECHNICAL ASSISTANCE FOR OVERSIGHT OF THE POTENTIALLY RESPONSIBLE PARTY (PRP) BNSF RAILWAY COMPANY (BNSF) AS THEY PERFORM A BACKGROUND STUDY, DATA GAPS ANALYSIS AND ENGINEERING EVALUATIONS/COST ANALYSES (EE/CA).	Environmental Protection Agency	541620	$50K	Jun 30, 2025	Jun 29, 2027
68HE0923F0067 ↗	THE PURPOSE OF THIS UNILATERAL MOD IS TO ADD INCREMENTAL FUNDING. THE CONTRACTOR SHALL PROVIDE TECH ASSIST, FOR OVERSIGHT OF PRP AS THEY PERFORM AN EE/CA FOR THE MAC & BLACKJACK MINES FOR CONTRACT 68HE0923D0002, THE (RAES)II FOR EPA FOR RGNS 6 AN	Environmental Protection Agency	541620	$50K	Aug 9, 2023	Aug 8, 2027
W912PP22D0018 ↗	MEGA ENVIRONMENTAL REMEDIATION SERVICES. MOD EXERCISES OPTION PERIOD.	Department Of The Army	562910	$0	Sep 25, 2022	—
68HE0924F0001 ↗	THE PURPOSE OF THIS UNILATERAL MODIFICATION IS TO EXTEND THE POP. THE CONTRACTOR SHALL SUPPORT DEVELOPMENT OF THE FEDERAL ACTIONS TO ADDRESS IMPACTS OF URANIUM CONTAMINATION IN THE NAVAJO NATION 2020-2029 (TEN-YEAR PLAN) UNDER THE RAES 2 CONTRACT #68	Environmental Protection Agency	541620	$0	Nov 1, 2023	Jun 11, 2026
68HE0923F0069 ↗	THE PURPOSE OF THIS UNILATERAL MODIFICATION IS TO ADD ATOCOR FOR THIS TO FOR THE REMOVAL SITE EVALUATIONS (RSES) AT THE ABANDONED URANIUM MINES (AUMS) AND MINE AREAS NAMED IN THE CYPRUS AMAX MINERALS COMPANY UNDER THE RAES 2 CONTRACT # 68HE0923D0002.	Environmental Protection Agency	541620	$0	Aug 14, 2023	Aug 13, 2026
68HE0924F0055 ↗	THE PURPOSE OF THIS UNILATERAL MODIFICATION IS TO EXTEND THE POP. THE CONTRACTOR SHALL PROVIDE TECHNICAL ASSISTANCE TO USEPA FOR TECHNICAL ASSISTANCE TO THE CONTAMINATED STRUCTURES PROGRAM UNDER THE RAES 2 CONTRACT.	Environmental Protection Agency	541620	$0	Jun 25, 2024	Sep 29, 2026