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Stevens Creek Bank Erosion & Outfall Repairs, Whisman Park Reach

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Contract Overview

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AI Contract Overview

The project addresses severe bank erosion and failed storm drain outfalls along approximately 700 linear feet of Stevens Creek near Whisman Park in Mountain View, California, about 2.5 miles upstream of San Francisco Bay. Erosion caused by the 2022/2023 winter season has created near-vertical 15-foot-high scarps within 8 to 10 feet of the Stevens Creek Trail, a paved pedestrian pathway separating the creek from State Highway 85, posing a direct risk to trail integrity and public access. Additional deterioration threatens the Hetch Hetchy Trail pedestrian bridge and could lead to its closure. The work will focus on three distinct areas containing four erosion zones and two failed storm drain outfalls, each requiring tailored stabilization measures. Construction will include installing planted and non-planted log-crib structures, compacted soil slopes covered with biodegradable fabric, and two buried storm drain culvert downdrains designed to discharge onto rock-filled log-crib faces. Work Area 1 involves stabilizing an exposed sakrete slope armor that is compromising a concrete downdrain, while Work Area 2 addresses erosion that has encroached into a gravel maintenance road within the Santa Clara Valley Water District easement. Work Area 3 targets critical erosion that has retreated to within eight feet of the trail and four feet of the pedestrian bridge abutment, while also reinforcing a downstream storm drain failure. The effort aims to protect infrastructure, preserve public access, and prevent further environmental degradation along this sensitive stretch of the creek.

General Info

Stabilize 700 feet of eroding Stevens Creek bank, repair storm drain outfalls, protect trail and bridge from collapse.

Agency

California → Regional Water Quality Control Board, Region 2 - San Francisco Bay, Oakland

NAICS

237990 - Other Heavy and Civil Engineering Construction

Place of Performance

Mountain View, CA

Set-Aside

NONE

Documents

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Timeline

PostedDec 16

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Organization & Contact Information

AgencyCalifornia → Regional Water Quality Control Board, Region 2 - San Francisco Bay, Oakland

Contacts1 person available

OfficeN/A

Organization / Agency

California → Regional Water Quality Control Board, Region 2 - San Francisco Bay, Oakland

Office AddressN/A

Contacts

Nathaniel GoetzWater Resource Control Engineer

contact@example.gov

+1 (555) 000-0000

Full Description

The Project is located at Stevens Creek (Creek) near Whisman Park and about 2.5 miles upstream of San Francisco Bay in Mountain View, Santa Clara County (Lat. 37.40095; Long. -122.06939). Project work will involve bank stabilization and outfall repairs from erosion that occurred at three areas along approximately 700 linear feet (LF) of the Creek during the 2022/2023 Winter season. The bank erosion caused a near-vertical 15-ft-high scarp within about 8-10 horizontal feet from the edge of a paved pedestrian pathway along Stevens Creek Trail (Trail), which separates the Creek from State Highway 85 to the west. Additional bank erosion could result in damage and public access closure to both the Trail and/or the Hetch Hetchy Trail pedestrian bridge. The Project will install planted and non-planted log-crib structures, planted biodegradable fabric-covered compacted soil slopes, and two buried storm drain culvert downdrains discharging onto rock-filled log-crib structure faces. Project work will be implemented at three work areas that include four bank erosion areas and two failed storm drain outfall areas. Work Area 1 is experiencing ongoing severe bank erosion (Bank Erosion Area 1) and features an exposed section of existing sakrete slope armor along the Creek bank, which is undermining the structural integrity of an existing cast-in-place steel-reinforced concrete downdrain (Bank Erosion Area 2 and Failed Storm Drain Outfall 1). Work Area 2 has severe bank erosion (Bank Erosion Area 3) that includes retreatment of the Creek top of bank into the existing gravel maintenance access road within the Santa Clara Valley Water District (SCVWD) easement. At Work Area 3, severe bank erosion (Bank Erosion Area 4) has retreated the Creek top of bank to within eight feet from the Trail and four feet from the pedestrian bridge abutment and is undermining a downstream storm drain outfall (Failed Storm Drain Outfall 2).