Finally! Union City Sink Hole Repair Almost Finished

UNION CITY, CA - Union Sanitary District officials said repairs to a sewer line and part of Alavardo Boulevard damaged late fall by a sinkhole in Union City will wrap up this month.

Crews are now filling and compacting the dirt where the sinkhole occurred. Street paving should be complete by mid-April and then the road will reopen.

Lane and crosswalk striping will be complete a week later, district officials said.

The road collapsed above the sewer line Oct. 14, 2015.

Previous Coverage:

• Commuter Alert: Sinkhole Closes Major Intersection in Union City
• Union City Sinkhole Repair to Last Indefinitely

The westbound lanes of Alvarado Boulevard between Fredi Street and Fair Ranch Road have been closed during repairs, according to district officials. The sinkhole damaged a 33-inch diameter sewer pipe that runs 20 feet below Alvarado Boulevard. The sinkhole also damaged a manhole, district officials said. Both have been repaired and flows returned to normal in the middle of last month.

Crews have repaired other utilities in the area and service will be restored next week, according to district officials. Sanitary district officials do not know what caused the sinkhole, but said a number of factors may have played a part. Infrastructure for several utilities and lots of groundwater and sandy soils are in the area, district officials said. The water table is higher than normal in the area.

--Bay City News; Photo of repair work on Oct. 16 courtesy Alameda County Water Department