The city's Department of Environmental Services will be working on seven sewer projects during March that will affect traffic on O'ahu.

The projects are:

• Halona Street Relief Sewer - Installation of a new sewer line and manholes along Olomea Street and Kohou Street, from Olomea Street to North King Street.

• Sand Island Basin Miscellaneous Sewer Improvements - Installation of cured-in-place pipes within Ala Moana Beach Park, on Nimitz Highway near Lagoon Drive and on Pali Highway near Hawaii Baptist Academy.

• Waipahu Street/Plantation Village Sewer Reconstruction - Installation of a new gravity sewer line near Plantation Village. Work on Waipahu Street is expected to be completed next month.

• Wanaao Road/Keolu Drive Reconstruction Sewer - Installation of a gravity sewer line along Wanaao Road between Palawiki and Papalani streets.

• Kailua Road Sewers Improvement District No. 276 - Installation of a new 8-inch sewer line along Kailua Road between Hahani Street and Aoloa Road).

• St. Louis Heights Sewer Rehabilitation - Installation of cured-in-place pipes along roads and easements, rehabilitation of sewer laterals and manhole rehabilitation in the areas along Peter Street, between Noah Street and Ruth Street.

• Ilimalia Loop/Mokapu Boulevard Sewer Rehabilitation - Installation of cured-in-place pipes and sewer manhole rehabilitation on Ilimalia Loop and along Mokapu Boulevard between Ililani Street and Kalaheo Avenue.