Engineering Geotechnical Studies for the Bay Delta Conservation Plan and/or Preliminary Engineering Studies for the Delta Habitat Conservation and Conveyance Pr

Engineering Geotechnical Studies for the Bay Delta Conservation Plan and/or Preliminary Engineering Studies for the Delta Habitat Conservation and Conveyance Pr

The project is limited to ~80 overwater borings, approximately 220 paired geotechnical borings, cone penetrometer soundings, and ~30 small test pits to test soils to obtain geotechnical data. 50 overwater geotechnical borings will take place in the Sacramento River to obtain information for 5 proposed intake structures. Approximately 20 overwater borings are planned at 12 major water crossings. An additional 5 to 12 geotechnical borings are proposed to obtain information for docking facilities. The depths of the borings will range between 100 and 200 ft deep below the bottom of the river and the diameter of the borings will be 3.5 to 5.5 inches. Drilling will be conducted with a rotary drilling rig mounted on a shallow-draft barge or ship. Multiple barges/ships may be operated concurrently. Upon completion of each hole, the borings will be grouted from the bottom of the borehole to within 10-15 ft of the top of the hole with 5% by weight bentonite and 95% by weight cement grout. The project is located throughout the Sacramento-San Joaquin Delta in the Counties of Sacramento, Yolo, San Joaquin, Contra Costa, and Solano.

Contra Costa, Sacramento, San Joaquin, Solano, Yolo