One of the major interceptor sewer serving the Los Angeles areas is the North Outfall Sewer (NOS), Extreme wet weather events caused several overflows within the City’s residential neighborhoods. The California Regional Water Quality Control Board issued a Cease and Desist Order (CDO) that required the City of Los Angeles to mitigate the overflow problems by upgrading sewers throughout the City. Two major projects, the East Central Interceptor Sewer (ECIS) and the Northeast Interceptor Sewer (NEIS) formed the basis for much of the upgrading effort. The Bureau of Engineering of the City of Los Angeles performed the design work of the replacement pipelines. Jacobs Associates, in association with Montgomery Watson and URS Greiner/Woodward Clyde, provided additional engineering support services for the design of the NEIS.
Given the project’s location in an urban setting and having significant impact on the local community, MORGNER was retained by Jacobs Associates to conduct pre-construction surveys for the Northeast Interceptor Sewer (NEIS) project along the 10-mile tunnel extending from the terminus of the E/W at Mission and Jesse Street to the one mile north of the Los Angeles/Glendale Water Reclamation Plant. The NEIS is part of a sewer system that provided hydraulic relief for the existing North Outfall Sewer (NOS), located in the northeat communities of Los Angeles.
The project involved a massive pre-construction survey encompassing about 400 commercial structures. The project route covers an extended area with a commercial real estate value of over $1 Billion in downtown Los Angeles.