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ENVIRONMENTAL

TOP 20 IN WATER SUPPLY
RANK*	FIRM	$US MIL.
1	Layne Christensen Co.	355.5
2	Black & Veatch	322.8
3	Kiewit Corp.	270.8
4	The Walsh Group Ltd.	248.6
5	Garney Holding Co.	238.7
6	Earth Tech Inc.	212.0
7	Oscar Renda Contracting Inc.	183.1
8	PCL Construction Enterprises Inc.	181.0
9	Barnard Construction Co. Inc.	172.9
10	CB&I	160.0
11	CH2M HILL Cos.	148.4
12	Shimmick Construction Co. Inc.	139.8
13	URS Corp.	135.7
14	TIC Holdings Inc.	135.0
15	Alberici Corp.	121.9
16	MWH Global	95.2
17	Skanska USA Inc.	86.4
18	Sundt Construction Inc.	79.5
19	Traylor Bros. Inc.	72.0
20	Lyles Construction Group	70.3
*Based on 2007 contracting revenue from water supply as reported in ENR's survey of leading contractors and design firms.

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