CONTENTS August 2021 / Vol. 76 No. 8 FEATURES 14 Taming a Mammoth Innovative interconnect improves Houston water operations 18 Five Steps to a Successful Sewer Bypass Project Sewer overfl ows are a daily occurrence. Clearing, repairing or replacing a pipe usually requires a temporary sewer bypass to divert the discharge from point A to point B and create a work area. 20 Creative Construction Sequencing Aids Light Rail Construction The LA Metro is in the fi nal stages of constructing an underground light rail trunkline that will allow riders to travel through downtown LA with far fewer transfers and more direct service. 22 CURRENTLY @ CUIRE CUIRE completes NCHRP pool-funded project on structural design for spray-applied pipe liners SPECIAL SECTION: Vacuum Excavators 29 Today's Do-It-All Machines As one of the hottest technologies in underground construction and rehabilitation, vacuum excavators off er tremendous opportunities for contractors. Find out how your peers viewed this market. 30 Vacuum Excavators for Utility Construction: Air or Water? Vacuum excavators are a common sight on utility construction project sites today. 31 What's Better for Your Vacuum Application: Truck or Trailer? Whether a vacuum excavator's digging system is high-pressure water or high-pressure air, equipment buyers must consider whether the equipment is best mounted on a trailer or a truck. REHABTECHNOLOGY 36 NASSCO Tech Tips Working with CIPP in environmentally sensitive areas-Part 2 38 Rehab News 39 2021 Buyer's Guide The 2021 Buyer's Guide is a comprehensive list of equipment and services for the underground utility infrastructure industry. Published annually in Underground Construction, this valuable resource features an interactive version that is available year-round at UCONonline.com. ON THE COVER A creative construction plan was used for the Broadway Station rebuild portion of the new Los Angeles County Metropolitan Transportation Authority underground light rail line. Concrete storm drain pipe was replaced with lighter Hobas pipe and suspended during the construction sequence. (Photo courtesy of Hobas Pipe USA) UCONonline.com | AUGUST 2021 3 SPECIAL VAC EX SECTION Buyer's Guide Taming a Mammoth Steps to Successful Sewer Bypass Tech Tips DEPARTMENTS 4 Exclusive from UCONonline.com 6 Editor's Log 8 Newsline 12 Washington Watch 47 Business 48 New Products 49 Business Cards 50 Calendar of Events / Ad Index / Sales Offi ces August 2021 UCONonline.comhttp://www.UCONonline.com http://www.UCONonline.com http://www.UCONonline.com http://www.UCONonline.com