For the 17th year, we are pleased to present in this issue the Top 50 Trenchless Technology Design Firms.The No. 1 ranked firm again is CH2M Hill, with 2011 trenchless engineering work of $135.6 million. Looking at the top 10 firms on the list, it is interesting to note that Stantec Consulting Services moved up from up No. 14 in 2011 to No. 7 in this year's rankings. Looking again at these Top 10 firms, Cardno TBE generates the highest percentage of billings at 39.8 percent from trenchless work followed by Hatch Mot McDonald with trenchless billings of 25.1 percent of its total revenue.
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机译：第17年，我们很高兴在本期中评选出50家最佳非开挖技术设计公司。再次排名第一的公司是CH2M Hill，其2011年的非开挖工程工作为1.356亿美元。在名单上排名前十的公司中，有趣的是，斯坦泰克咨询服务公司从2011年的第14名上升到今年的第7名。再次看一下这十大公司，Cardno TBE的开槽业务产生的开票比例最高，达到39.8％，其次是Hatch Mot McDonald，开槽业务产生的开票收入占其总收入的25.1％。
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