SCH Number 2007031035

Project Info

Title

San Jose Creek Capacity Improvement Project

Description

The Applicant intends to alter the streambed modify the existing conrete lined channel to provide flood protection and fish passage. Components of the project include the removal and replacement of 80 linear feet of the existing trapezoid concrete lining with new poured in place vertical walls above Hollister Avenue. In the 70 ft downstream of Hollister Bridge, and under the bridgem the existing conrete will be removed and replaced with transition from vertical walls under the bridge to the existing trapezoid section on the west bank and a new section on the east bank. The areas of transition and the area along the bottom of the channel will consist of various sized rock revetment with joint willow plantings. No changes will be made to the west bank for 3,000 linear feet. the concrete on the east bank will be removed and replaced with a new concrete channel that will be widened 7 to 12 feet to include the fish passage component. The east bank will include a 4 to 4 ft high vertical flood wall on the top of the bank. An existing steel vehicle bridge 100 feet downstream of Hollister Avenue will be removed, along with a sewer line. The new sewer line will be relocated under State Route 217 using a jack and bore method. From 3,000 ft downstream to 4,000 feed from Hollister Avenue, both banks will be altered to widen the channel to ~75 ft, and due to a sewer line, the low flow channel will transition from 2 to 3 ft deep, to construction of 8 to 12 inch high concrete berms along the bottom. A new 42 inch high flood wall will be constructed along the west bank from 2,000 ft downstream of Hollister Avenue, to South Street. Excavation for the wall footings will be 3 to 5 ft deep. The fish passage component consists of the low flow channel, about 10 to 12 ft wide, 2 to 3 ft deep, with notches and/or slotted weirs, for the entire length of the project area.

3 documents in project