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...ns rely on bottled or filtered water. The steel pipeline being laid along Sepulveda Blvd., will replace an existing riveted-steel trunk line installed in 1913 that will be rehabilitated. The Los Angeles region is historically arid; thus the water supply is of keen interest. Workers with the Los Angeles Department of Water and Power are using pipe segments that vary from 54 to 102 inches in diameter. Aiming to bring the project in on schedule by the end of the year, workers install isolation joints to prevent the pipe from corroding. The cement-lined steel pipeline sections are welded together. The LADWP's goal is "to assure a reliable and high-quality water supply throughout the city." After each section of pipe is positioned, the excavated soil is reused to backfill the 16-feet-wide trench running down the centerline of the roadway. The Sepulveda Trunk Line lies only 4 feet below the ground. While Los Angeles awaits the completion of the pipeline, some ...