The Alpharetta City Council has approved contracts totaling $700,000 for repairs to pipes and other infrastructure that carry away stormwater.

More than 10 miles of corrugated metal pipes in the city have met or exceeded their life expectancy of roughly 25 years, a staff memo says, but pipe-lining could fix problems and prolong pipe life by 50 years.

The $500,000 budgeted for this task would treat about 2,500 feet of pipe in 30 work orders over five years, staff said. Three companies – IPR Southeast, Utility Asset Management Inc. and Chase Plumbing & Mechanical Inc. – will split the job.

A fourth company, Georgia Earth and Pipe LLC, won a $200,000 contract to make on-call storm structure and drainage repairs. Junction boxes, catch basins, grate inlets and other structures will be repaired over the next five years.