Caltrans District 4
Harry Y. Yahata, District Director
FOR IMMEDIATE RELEASE
November 30, 2000
CONTACT: Lauren E. Wonder, 408/232-0228
SB 280 SINKHOLE REPAIRS TO CLOSE THREE LANES FRIDAY
Three lanes on southbound Interstate 280 between Bird Avenue and Route 87 will be closed Friday, December 1 from 9:30 AM until 3 PM in order to repair road slabs around the previous sinkhole. The closure will affect the three right lanes—Interstate 280’s slow lane and the two dedicated lanes leading to the Route 87 connector.
Motorists are advised to expect delays and plan accordingly. They will still be able to access Route 87 at the back end of the gore point.
Crews will inject foam under the roadbed to support road slabs. The pump temporarily failed and some of the natural drainage material placed earlier this year slipped away causing the slabs to crack and a dip to form at the connector. After the foam is placed and secure, crews will return within a few weeks to pave the lanes.
A two-foot wide, three-foot deep sinkhole developed February 29. Crews then placed a permeable blanket of layered rock that connected up to existing drains. When the pump recently failed, the water table rose and carried away some of the supporting rock. The foam will provide additional support to the rock.
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