Top 100 Contractors in PSC B510: Environmental Studies and Assessments, FY2021

Name: Top 100 Contractors in PSC B510: Environmental Studies and Assessments, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 36% of FY2021 PSC B510 contract dollars

Contract obligations: $113,150,587 Net of deobligations, by contracts coded PSC B510
Contractors: 304 Parent companies with an obligation
Largest contractor: Stantec Incorporated $7.86 million, 6.0% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Stantec Incorporated 4 awardees, including Stantec Consulting Services Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$7,857,951	6.0%	Rank history: #22 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
2	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) GSA (General Services Administration)	$5,543,139	4.3%	Rank history: #12 in FY2022, #13 in FY2023, #7 in FY2024 and #6 in FY2025; up 6 since FY2020.
3	Environmental Management & Planning Solutions LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$5,045,988	3.9%	Rank history: #4 in FY2022, #2 in FY2023, #70 in FY2024 and not on the FY2025 list; down 2 since FY2020.
4	Pact, Inc. Top agencies USAID (US Agency for International Development)	$5,000,000	3.8%	Rank history: #17 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
5	ICF International, Inc. Through ICF Incorporated, L.L.C. Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$4,622,152	3.6%	Rank history: #3 in FY2022, #8 in FY2023, #26 in FY2024 and not on the FY2025 list; up 6 since FY2020.
6	Gulf South Research Corp Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$4,212,758	3.2%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
7	Tetra Tech, Inc. 7 awardees, including Tetra TECH EC, Inc. Top agencies EPA (Environmental Protection Agency) DOE (Department of Energy) DHS (Department of Homeland Security)	$4,177,722	3.2%	Rank history: #2 in FY2022, #1 in FY2023, #3 in FY2024 and #2 in FY2025; down 5 since FY2020.
8	WSP USA Solutions Inc. Top agencies DOI (Department of the Interior) DOE (Department of Energy) DOJ (Department of Justice)	$4,096,523	3.2%	Rank history: #8 in FY2022, #14 in FY2023, #21 in FY2024 and not on the FY2025 list; up 30 since FY2020.
9	Consolidated Safety Services Incorporated Top agencies EPA (Environmental Protection Agency)	$3,783,899	2.9%	Rank history: #14 in FY2022, #15 in FY2023, #15 in FY2024 and #10 in FY2025; up 1 since FY2020.
10	State of California Controllers Office Through University of California, Davis Top agencies EPA (Environmental Protection Agency)	$2,854,838	2.2%	Rank history: #19 in FY2022, #11 in FY2023, #25 in FY2024 and not on the FY2025 list; up 11 since FY2020.
11	T1 Construction LLC Top agencies DOI (Department of the Interior)	$2,518,070	1.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
12	Horsley Witten Group, Inc. Top agencies EPA (Environmental Protection Agency)	$2,214,383	1.7%	Rank history: #41 in FY2022, #40 in FY2023, #32 in FY2024 and #38 in FY2025; up 16 since FY2020.
13	EA Engineering, Science, and Technology, Inc., PBC Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency)	$2,212,959	1.7%	Rank history: #20 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
14	General Dynamics Corporation Through Csra LLC Top agencies EPA (Environmental Protection Agency)	$1,986,191	1.5%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
15	Industrial Economics Inc. Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency) DOE (Department of Energy)	$1,742,886	1.3%	Rank history: #32 in FY2022, #43 in FY2023, #93 in FY2024 and not on the FY2025 list; down 9 since FY2020.
16	Windjammer Environmental LLC Top agencies Army (Department of the Army) SSA (Social Security Administration)	$1,673,380	1.3%	Rank history: not on the FY2022–FY2025 lists; up 232 since FY2020.
17	Ahtna, Incorporated 2 awardees, including Ahtna Global LLC and Ahtna Environmental, Inc. Top agencies Army (Department of the Army)	$1,671,889	1.3%	Rank history: #11 in FY2022, #19 in FY2023, #91 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
18	Anamar Environmental Consulting, Inc. Top agencies Army (Department of the Army)	$1,553,771	1.2%	Rank history: #28 in FY2022, #32 in FY2023, #33 in FY2024 and #18 in FY2025; up 46 since FY2020.
19	Land IQ, LLC Top agencies DOI (Department of the Interior)	$1,465,808	1.1%	Rank history: #26 in FY2022, #38 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
20	LG2 Environmental Solutions, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$1,379,954	1.1%	Rank history: #57 in FY2022, #49 in FY2023, #69 in FY2024 and #27 in FY2025; up 73 since FY2020.
21	Swca, Incorporated Top agencies DOI (Department of the Interior)	$1,317,717	1.0%	Rank history: #9 in FY2022, #5 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2020.
22	AECOM 3 awardees, including AECOM Technical Services, Inc. and AECOM Italia S.P.A. Top agencies DOI (Department of the Interior) DHS (Department of Homeland Security) Army (Department of the Army)	$1,286,264	1.0%	Rank history: #5 in FY2022, #3 in FY2023, #12 in FY2024 and #30 in FY2025; up 40 since FY2020.
23	Southeastern Archaeological Research, LLC Top agencies Army (Department of the Army)	$1,251,312	1.0%	Rank history: #35 in FY2022, #48 in FY2023, #54 in FY2024 and #15 in FY2025; down 6 since FY2020.
24	Blue World Research Institute Inc. Top agencies DOI (Department of the Interior)	$1,229,259	0.9%	Rank history: #72 in FY2022, #16 in FY2023, #38 in FY2024 and #40 in FY2025; new, not ranked in FY2020.
25	Coastal Frontiers Corporation Top agencies DOI (Department of the Interior)	$1,111,901	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
26	Salas O'brien Federal, LLC Top agencies Army (Department of the Army)	$1,097,236	0.8%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
27	Cogstone Resource Management Top agencies DHS (Department of Homeland Security)	$1,081,927	0.8%	Rank history: not on the FY2022 list, #64 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2020.
28	The Clark Group. Llc Top agencies DOJ (Department of Justice)	$1,035,946	0.8%	Rank history: #15 in FY2022, #29 in FY2023, #9 in FY2024 and not on the FY2025 list; up 1 since FY2020.
29	Red River Resources LLC Top agencies DOI (Department of the Interior)	$1,006,259	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
30	Panamerican Consultants Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$999,376	0.8%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; up 40 since FY2020.
31	Kgsne JV, LLC Top agencies EPA (Environmental Protection Agency)	$970,000	0.7%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
32	Wood Environment & Infrastructure Solutions Inc. Through WSP USA Environment & Infrastructure Inc. Top agencies EPA (Environmental Protection Agency)	$967,469	0.7%	Rank history: #37 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; up 11 since FY2020.
33	Northland Research, Inc. Top agencies DHS (Department of Homeland Security)	$894,743	0.7%	Rank history: #18 in FY2022, #23 in FY2023, #27 in FY2024 and not on the FY2025 list; down 11 since FY2020.
34	Ecosystem Research Group LLC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$892,613	0.7%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
35	Dawson Solutions, Inc. Top agencies DHS (Department of Homeland Security)	$866,634	0.7%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; up 122 since FY2020.
36	Environmental Science Corporation Top agencies Army (Department of the Army)	$863,941	0.7%	Rank history: #36 in FY2022, #46 in FY2023, #62 in FY2024 and #25 in FY2025; up 1 since FY2020.
37	Summitec Corp Top agencies EPA (Environmental Protection Agency)	$848,849	0.7%	Rank history: #61 in FY2022 and not on the FY2023–FY2025 lists; up 20 since FY2020.
38	Alaniz Associates Corp Top agencies Army (Department of the Army)	$842,692	0.6%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
39	Mabbett & Associates, Inc. Top agencies GSA (General Services Administration) VA (Department of Veterans Affairs)	$834,528	0.6%	Rank history: #33 in FY2022, not on the FY2023 list, #55 in FY2024 and #59 in FY2025; up 219 since FY2020.
40	GLE Associates, Inc. Top agencies Army (Department of the Army)	$823,509	0.6%	Rank history: not on the FY2022 list, #42 in FY2023, #65 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
41	Redhorse Corporation Top agencies DHS (Department of Homeland Security) GSA (General Services Administration)	$806,528	0.6%	Rank history: not on the FY2022–FY2025 lists; up 70 since FY2020.
42	Hazair Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$795,674	0.6%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
43	Envirosystems Management Inc. Top agencies DHS (Department of Homeland Security)	$761,751	0.6%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
44	Anderson Environmental Contracting LLC Top agencies USDA (Department of Agriculture)	$755,217	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
45	Swift River Versar JV Top agencies Navy (Department of the Navy)	$749,534	0.6%	Rank history: #38 in FY2022, #44 in FY2023, #24 in FY2024 and #81 in FY2025; down 29 since FY2020.
46	Recon Environmental,Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$721,983	0.6%	Rank history: #24 in FY2022, #55 in FY2023, #14 in FY2024 and not on the FY2025 list; down 12 since FY2020.
47	TTL Associates Inc. Top agencies VA (Department of Veterans Affairs)	$694,792	0.5%	Rank history: not on the FY2022–FY2025 lists; up 39 since FY2020.
48	Continental Shelf Associates Incorporated Through CSA Ocean Sciences Inc. Top agencies DOI (Department of the Interior)	$662,899	0.5%	Rank history: not on the FY2022–FY2025 lists; up 113 since FY2020.
49	Weston Solutions Holdings, Inc. 2 awardees, including Weston Solutions Inc. Top agencies EPA (Environmental Protection Agency)	$662,138	0.5%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
50	Bowhead Total Enterprise Solutions, LLC Top agencies Army (Department of the Army)	$653,396	0.5%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 17 since FY2020.
51	Transcon Environmental Inc. Top agencies USDA (Department of Agriculture)	$652,298	0.5%	Rank history: not on the FY2022–FY2025 lists; up 41 since FY2020.
52	Engineering / Remediation Resources Group, Inc. Top agencies USDA (Department of Agriculture)	$632,924	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Cardno Emerging Markets USA Ltd. 2 awardees, including Stantec GS Inc. and Cardno, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$627,716	0.5%	Rank history: not on the FY2022–FY2025 lists; up 239 since FY2020.
54	S C & A Inc. 2 awardees, including EC / R Incorporated Top agencies EPA (Environmental Protection Agency)	$611,100	0.5%	Rank history: not on the FY2022–FY2023 lists, #35 in FY2024 and #36 in FY2025; down 34 since FY2020.
55	Shekar Engineering, P.l.c Top agencies DLA (Defense Logistics Agency)	$601,581	0.5%	Rank history: not on the FY2022 list, #78 in FY2023, #98 in FY2024 and not on the FY2025 list; up 32 since FY2020.
56	Lehigh University Top agencies DOS (Department of State)	$576,518	0.4%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; up 69 since FY2020.
57	Arcadis N.V. 2 awardees, including Arcadis of New York, Inc. Top agencies DHS (Department of Homeland Security)	$564,285	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	MBK Engineers Top agencies DOI (Department of the Interior)	$561,000	0.4%	Rank history: #69 in FY2022, #67 in FY2023, #13 in FY2024 and #53 in FY2025; up 2 since FY2020.
59	Water & Air Research, Inc. Top agencies Army (Department of the Army)	$546,540	0.4%	Rank history: #88 in FY2022, #100 in FY2023, #71 in FY2024 and #58 in FY2025; up 262 since FY2020.
60	Meadows Cmpg, Inc. Top agencies Navy (Department of the Navy)	$527,040	0.4%	Rank history: #68 in FY2022 and not on the FY2023–FY2025 lists; up 24 since FY2020.
61	Neptune and Company, Incorporated Top agencies DOE (Department of Energy)	$488,133	0.4%	Rank history: #52 in FY2022, #18 in FY2023, #28 in FY2024 and #13 in FY2025; down 46 since FY2020.
62	The NDN Sundance JV LLC Top agencies Army (Department of the Army)	$487,662	0.4%	Rank history: #21 in FY2022, #56 in FY2023, #58 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
63	The University Court of the University of ST Andrews Top agencies DOI (Department of the Interior)	$474,728	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Tepa, LLC Through Tehama ECS LLC Top agencies DOI (Department of the Interior)	$448,905	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Advanced Technologies and Laboratories (Atl) International, Inc. Top agencies SSA (Social Security Administration)	$422,406	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	OCH JV Top agencies EPA (Environmental Protection Agency)	$416,087	0.3%	Rank history: not on the FY2022–FY2024 lists and #69 in FY2025; up 17 since FY2020.
67	Global Consulting Inc. Top agencies HHS (Department of Health and Human Services)	$411,018	0.3%	Rank history: #73 in FY2022, #65 in FY2023, #53 in FY2024 and #41 in FY2025; up 103 since FY2020.
68	Brown and Caldwell Top agencies DOI (Department of the Interior)	$407,192	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Dj&A, P.C. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$405,220	0.3%	Rank history: #82 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
70	The CNA Corporation Top agencies DOS (Department of State)	$400,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Gryphon Environmental, LLC Top agencies VA (Department of Veterans Affairs)	$393,519	0.3%	Rank history: not on the FY2022–FY2025 lists; down 52 since FY2020.
72	Aspen Environmental Group Top agencies DOI (Department of the Interior)	$385,827	0.3%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; up 48 since FY2020.
73	Rjrudy LLC Top agencies DOI (Department of the Interior)	$362,740	0.3%	Rank history: not on the FY2022–FY2025 lists; up 39 since FY2020.
74	University of Wisconsin System 2 awardees Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$361,617	0.3%	Rank history: not on the FY2022–FY2025 lists; up 178 since FY2020.
75	Arctic Slope Regional Corporation Through Asrc Federal Field Services, LLC Top agencies DHS (Department of Homeland Security)	$358,134	0.3%	Rank history: not on the FY2022 list, #34 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
76	Apec Co., Ltd Top agencies Army (Department of the Army)	$354,903	0.3%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
77	Cardno Tec-Gmi Joint Venture Top agencies USAF (Department of the Air Force)	$348,487	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Hsg, LLC Top agencies DOI (Department of the Interior) GSA (General Services Administration)	$347,346	0.3%	Rank history: not on the FY2022–FY2024 lists and #79 in FY2025; up 39 since FY2020.
79	Environmental Solutions & Innovations, Inc. Top agencies USDA (Department of Agriculture) Army (Department of the Army)	$342,539	0.3%	Rank history: #70 in FY2022, #52 in FY2023, #56 in FY2024 and not on the FY2025 list; up 86 since FY2020.
80	Etegra, Inc. Top agencies USDA (Department of Agriculture)	$322,269	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Geomorph Information Systems, LLC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$313,052	0.2%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
82	Asir LLC Top agencies DOI (Department of the Interior)	$305,610	0.2%	Rank history: #78 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
83	Hdr, Inc. 2 awardees, including HDR Environmental, Operations and Construction, Inc. Top agencies Navy (Department of the Navy)	$302,594	0.2%	Rank history: #47 in FY2022, #31 in FY2023, #4 in FY2024 and #4 in FY2025; down 56 since FY2020.
84	Southern California Coastal Water Research Project Authority Top agencies DOI (Department of the Interior)	$300,000	0.2%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
85	Cardinal Point Captains, Inc. Top agencies DOI (Department of the Interior)	$299,960	0.2%	Rank history: not on the FY2022–FY2025 lists; down 35 since FY2020.
86	Southall Environmental Associates Inc. Top agencies DOI (Department of the Interior)	$299,688	0.2%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
87	Avanti Corporation Top agencies DOI (Department of the Interior)	$292,445	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Marstel-Day, LLC Top agencies USAF (Department of the Air Force)	$278,893	0.2%	Rank history: #58 in FY2022, #47 in FY2023, #77 in FY2024 and #49 in FY2025; up 3 since FY2020.
89	Axiom Data Science LLC Top agencies DOI (Department of the Interior)	$274,948	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Arcgeo Inc. Top agencies Army (Department of the Army)	$258,598	0.2%	Rank history: not on the FY2022–FY2025 lists; down 35 since FY2020.
91	Quaternary Resource Investigations, L.L.C. Top agencies GSA (General Services Administration)	$257,009	0.2%	Rank history: #23 in FY2022, #24 in FY2023, #43 in FY2024 and not on the FY2025 list; down 14 since FY2020.
92	NA Alii Consulting & Sales LLC Top agencies Army (Department of the Army)	$252,467	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Procon Consulting LLC Top agencies DOT (Department of Transportation)	$250,527	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Marsh & Associates LLC Top agencies DOI (Department of the Interior)	$250,521	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Vernadero Group Inc. Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico) USAF (Department of the Air Force) Army (Department of the Army)	$247,862	0.2%	Rank history: not on the FY2022–FY2024 lists and #5 in FY2025; up 80 since FY2020.
96	Great Lakes Environmental Center, Inc. Top agencies Army (Department of the Army)	$242,011	0.2%	Rank history: not on the FY2022–FY2025 lists; down 44 since FY2020.
97	The Verification Research Training and Information Centre (Vertic) Top agencies DOS (Department of State)	$234,601	0.2%	Rank history: #46 in FY2022, #83 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
98	Applied Intellect LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$233,330	0.2%	Rank history: not on the FY2022–FY2025 lists; down 42 since FY2020.
99	Paleowest LLC Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$232,699	0.2%	Rank history: not on the FY2022–FY2023 lists, #94 in FY2024 and #37 in FY2025; new, not ranked in FY2020.
100	Assc Inc. Top agencies USDA (Department of Agriculture)	$232,560	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 304 contractors listed here. See the rest on GovTribe.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $130 million obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC B510 contractors in FY2021?

1. Stantec Incorporated ($7.86M), 2. Eastern Research Group Inc. ($5.54M), 3. Environmental Management & Planning Solutions LLC ($5.05M), 4. Pact, Inc. ($5M), 5. ICF International, Inc. ($4.62M), 6. Gulf South Research Corp ($4.21M), 7. Tetra Tech, Inc. ($4.18M), 8. WSP USA Solutions Inc. ($4.1M), 9. Consolidated Safety Services Incorporated ($3.78M), 10. State of California Controllers Office ($2.85M).

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