Trenchless Technology

SEP 2018

Trenchless Technology is the premier communications vehicle for the trenchless industry. Through our multiple platforms, readers receive insights into the trenchless industry, as well as keep connected to the latest news, products and projects.

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T H E C I T Y O F S A N D I EG O'S M E T R O P O L I TA N WA S T E WAT E R D I V I S I O N H A S B E E N R E H A B I L I TAT I N G I T S D E T E R I O R AT E D S E W E RS F O R N E A R LY 20 Y E A RS. Before 2000, the City had a chronic problem of sanitary sewer spills with hundreds of sewer overlows each year, largely due to root intrusion and deteriorating pipe joints. As part of an agreement with the U.S. EPA agree- ment , the City embarked on an aggres- sive Sewer Spill Reduction Program. The key elements of this program included cleaning all 3,000 miles of the Municipal Sewerage System. Oth- er initiatives included developing a system-wide cleaning schedule, tele- vising and assessing the condition of more than 1,200 miles of the oldest and most problematic sewer lines in the system and increasing the number of miles of sewer lines replaced or re- habilitated from 15 miles per year to 45 miles per year. Since the program was implement- ed, the City has reduced the problem dramatically. In 2001 the City had 365 sewer spills – an average of one a day. By 2015 that number was down to 35; which is more than a 90 per- cent reduction . " We've reduced the problem dramatically and anticipate even fewer overlows as we contin- ue to renew our sewers," said Craig Whittemore, P.E., senior engineer for San Diego's Metropolitan Wastewater Division . According to the City, the current estimate for dig and replace projects is approximately $2.3 million per mile. However, by utilizing modern trench- less methods, the cost drops to about $800,000 per mile; a difference of $1.5 million every mile. Looked at another way, San Diego can rehabilitate almost three miles with trenchless technolo - gies for every mile they dig and re- place. 56 T R E N C H L E S S T EC H N O LO GY S E P T E M B E R 2018

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