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SR-280 Sinkhole Repair DO (EA 04-0V800)

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State & Local

Contract Overview

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AI Contract Overview

Caltrans is undertaking emergency repairs to address critical sinkholes on State Route 280 in San Mateo County at post miles 6.82 and 7.1, which were caused by winter storms and culvert failures. The sinkhole at PM 7.1, located near San Carlos Vista Point and adjacent to a 48-inch culvert, resulted from a collapsed concrete collar and slope over-saturation, creating a 15-foot wide by 3-foot deep washout that compromised the shoulder and necessitated the closure of Lane No. 1. The sinkhole at PM 6.82, on the off-ramp at Edgewood Rd, was similarly caused by a culvert failure. Both sites pose immediate safety risks to the public and threaten the structural integrity of the roadway, with unaddressed drainage issues likely to cause further sinkholes. The project includes excavating both sinkholes, backfilling with structural material, and compacting the soil to restore stability. At PM 7.1, the damaged roadway slab and culvert collar will be replaced, while at PM 6.82, the existing culvert will be lined to prevent future failure. The repaired sections will be resurfaced with asphalt concrete, with a hot mix asphalt dike and tack coat applied for added durability. Permanent erosion controls will be installed on the slope, and all removed pavement markings and delineation will be restored. During construction, traffic control measures, including temporary K-railing, will be implemented to ensure public safety and maintain traffic flow.

General Info

Emergency repair of sinkholes on SR 280 due to culvert failures, with excavation, backfilling, culvert repair, and resurfacing.

Agency

California → Caltrans, District 4 - Bay Area/Oakland

NAICS

237310 - Highway, Street, and Bridge ConstructionView NAICS

Place of Performance

Set-Aside

NONE

Documents

(1)

0V800 NOE_Signed

PDF

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Timeline

PostedAug 3

forecast

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Organization & Contact Information

AgencyCalifornia → Caltrans, District 4 - Bay Area/Oakland

Contacts1 person available

OfficeN/A

Organization / Agency

California → Caltrans, District 4 - Bay Area/Oakland

Office AddressN/A

Contacts

Juliane SmithSenior Environmental Scientist (NEPA/CEQA Specialist)

contact@example.gov

+1 (555) 000-0000

Full Description

Caltrans proposes repairing the roadway and drainage at post miles (PM) 6.82 and 7.1 on State Route (SR-) 280 in San Mateo County. Due to winter storms, sinkholes occurred at PM 7.1 between San Carlos Vista Point and Edgewood Rd and at PM 6.82 on the off-ramp at Edgewood Rd. Both sinkholes are on the shoulder of the mainline and were covered by steel plates. The sinkholes post a risk to SR-280 and endanger the health and safety of the public. The failed drainages post a future risk of subsequent sinkholes if they are not repaired. The sinkhole at PM 7.1 is adjacent to a 48-inch diameter culvert and 42-feet south of a drainage inlet (DI). The Damage Assessment Team concluded that the slope became over-saturated during a rain event and resulted in a large washout approximately 15-feet wide by 3-feet deep. The embankment has a 1.25H:1V slope. The existing ditch at the toe of the slope connected to the drainage inlet that was covered by the washout material necessitated the closure of Lane No. 1 to traffic. A culvert inspection determined that the failure of a concrete collar created the sinkhole. The sinkhole at PM 6.82 was caused by a culvert failure near the Edgewood Rd off-ramp near Lane No. 1. Geotechnical preliminary investigation recommends excavation of both sinkholes, backfilling with structural material, and then compaction. At the PM 7.1 sinkhole, the concrete slab on the roadway will be replaced and the concrete collar at the culvert will be repaired. At the PM 6.82 sinkhole, the existing culvert will be lined. The project will also install a hot mix asphalt (HMA) dike and tack coat. The damaged roadway will be paved with asphalt concrete (AC) and any damaged or removed pavement striping and delineation will be replaced. Permanent erosion control will be placed on the slope. Traffic control and temporary k-railing will be required during construction.