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� <br /> Exploration Ground Surface Topsoil Fill Thickness Weathered Tili Unweathered Till <br /> Elevation(ft) Thickness(in) (ft) Elevation(ft) Elevation(ft) <br /> TP-12* 4241/2 6 31/2 421 4171/� <br /> TP-13 413 8 1 412 411 <br /> TP-14 408i/z 12 4 404�h 403 <br /> TP-15 394 6 1/z 3931h 391 <br /> TP-16 408 12 1 407 406 <br /> TP-17* 4171/z 12 2 4151/2 413 <br /> Notes: <br /> *PIT conducted at about Elevation 4201/z feet in TP-12 and Elevation 4141/2 feet in TP-17 <br /> Groundwater Condition� <br /> �-- We observed slow groundwater seepage at various depths in borings B-1, B-3, B-4, and B-S and in test <br /> . �� pits TP-2, TP-3, TP-7, TP-S, and TP-10. The observed groundwater appears to be perched within the fill, <br /> weathered till, and/or small sand lenses within the unweathered glacial till. Perched groundwater may be <br /> encountered within and overlying the denser glacial till during the wet season (October through May). <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Based on the results of our subsurFace exploration program, it is our opinion that the proposed Beverly <br /> Park Substation Expansion project may be constructed satisfactorily as planned with respect to <br /> geotechnical elements. Recommendations pertaining to the geotechnical aspects of the project are <br /> presented in the following sections. <br /> Earthquake Engineering <br /> 2012 IBC Seismic Design Information <br /> We recommend the 2012 International Building Code (IBC) parameters for Site Class, short period <br /> spectral response acceleration (Ss), 1-second period spectral response acceleration (S1), and Seismic <br /> Coefficients Fa and Fv presented in Table 2. <br /> TABLE 2. 2012 IBC SEISMIC PARAMETERS <br /> IBC Parameter Recommended Value <br /> Site Class C <br /> Short Period Spectral Response Acceleration,Ss(percent g) 139 <br /> 1-Second Period Spectral Response Acceleration,S�(percent g) 53 <br /> Seismic Coefficient, Fn 1.0 <br /> Seismic Coefficient, Fv 1.3 <br /> Liquefaction <br /> Liquefaction refers to a condition where vibration or shaking of the ground, usually from earthquake <br /> forces, results in development of excess pore pressures in saturated soils and subsequent loss of <br /> GEOENGINEER� October24,2014 Page 5 <br /> File No.0482-027-02 <br />