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ENGEO <br /> INCORPORATED <br /> <br /> <br />5150.100.101 <br />May 2, 2008 Page 7 <br />We provide the above excavatability information for general planning purposes only. This <br />information is not intended for bidding purposes. <br /> <br />5.3 STATIC AND PERCHED GROUNDWATER <br /> <br />It does not appear that the static groundwater level beneath the site will affect the proposed <br />development. However, we anticipate that a significant amount of perched water will be <br />encountered in the cuts to grade the site. Perched water can: <br /> <br />1. Impede grading activities; <br />2. Cause instability of temporary cuts; <br />3. Cause moisture damage to sensitive floor coverings; <br />4. Transmit moisture vapor through slabs causing excessive mold/mildew build-up, fogging of <br />windows, and damage to computers and other sensitive equipment. <br />5. Cause premature pavement failure if hydrostatic pressures build up beneath the section. <br /> <br />We provide recommendations to reduce the effects of perched water in the sections on Site <br />Drainage, Slab Moisture Vapor Reduction, and Cut-Off Curbs. <br /> <br />5.4 SEISMIC HAZARDS <br /> <br />Potential seismic hazards resulting from a nearby moderate to major earthquake can generally be <br />classified as primary and secondary. The primary effect is ground rupture, which is also called <br />surface faulting. The common secondary seismic hazards include ground shaking, seismically <br />induced landsliding, lurch cracking, soil liquefaction, and lateral spreading. These hazards are <br />discussed in the following sections. Based on the topographic setting, risk from tsunamis, or <br />seiches is considered negligible at the site. <br />