Fish & Wildlife 5 (San Diego)
(California Department of Fish and Wildlife, Region 5)
Interstate 805 South Geotechnical Studies Project
NOE - Notice of Exemption
SAA #1600-2014-0059-R5 - The Applicant proposes to drill fifteen 4.25 inch diameter mud-rotarty (MR) borings to be drilled beneath the I-805 Bridge in the channel of the Sweetwater River using a self-contained mud circuit consisting of a mud tub at the surface and a mud pump, and a drill bit approximately 4.25 inches in diameter, which will be cooled and lubricated by drilling mud. The project will drill approximately 150 feet below the surface of the lagoon soil surface. The drilling mud will be pumped through the hollow bit, and recovered using in 55 gallon drums, and transported off-site. The hole will be allowed to collapse in on itself as the drill rod is retracted.
The geotechnical investigation is for the purpose of information gathering for the design of foundations for the proposed bridge expansion overt eh Sweetwater River.
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