The contractor shall provide all personnel, equipment, material, tools, supervision, quality control, and other items necessary to properly perform Geophysical surveying at Isabella Dam. The contractor shall also input all existing geotechnical and geophysical data provided by the Corps into a database (or other useable format) in order to build a 3-dimensional (3-D) presentation of these data. The primary goals of these surveys are to characterize material properties below the median ridge along the right abutment of the auxiliary dam and to identify shear zones to aid in designing the new Borel Canal tunnel alignment. To aid in evaluating the final tunnel alignment the lines will extend across the plateau to the west of the median ridge to provide complete coverage and overlap onto the emergency spillway alignment. Maximum depth of investigation is 60 m (200 ft). Information will be used to define rock properties. Direct measurements of Vp and Vs are to be made while Vp/Vs, Poisson's Ratio, elastic moduli (e.g., shear modulus (G), Young's modulus (E), & bulk modulus (K)), and Vs30 are to be calculated and presented in 2-dimentional (2-D) profiles. Furthermore, high resolution Time-Domain (or Frequency-Domain) electromagnetic (TDEM/FDEM) surveys will be co-located along these seismic lines to look for thin shear zones.
Optional geophysical surveys downstream of the Auxiliary dam.

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