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Project No. JB-569 20 June 2006 Page 4 4.2 Geotechnical Hazards Risk of geotechnical hazards will always exist due to uncertainties of geologic conditions and the unpredictability of seismic activity in the area. However, in our opinion, based on available data, there are no indications of geotechnical hazards that would preclude use of the site for the proposed development. The proposed structures should be designed to meet current Uniform Bui/ding Code (UBC) requirements to limit potential damage from ground shaking. 4.2.1 Liquefaction It is our opinion, based on our review of hazard maps, the soil conditions encountered, and laboratory testing, that the site soils encountered have a low potential of soil liquefaction. 4.2.2 Landslides Native slopes on the site are generally mild 13H:1 V or less). The fill slopes north of the existing residence and in the northwest corner of the site appear to over- steepened. These areas should be graded in accordance with our recommendations. The slope immediately south of Lot 1 is the backyard for an adjacent residence. The slope is mild (approximately 4H:1 V) and has a 10 to 1 5- foot bench with a concrete drainage ditch at the property boundary. Based on this information, it is our opinion that the site has a low potential for landslides. Some minor sloughing may be expected as soils are saturated during the winter months. 4.2.3 Flooding The site is not located within the 100-year flood zone according to FEMA National Flood Insurance Program Hazard maps (www. esri.com/hazards). 5.0 DISCUSSIONS 5.1 General The recommendations contained in this report are based on the assumption that the soil conditions encountered during construction are similar to those disclosed by our exploration. If variations are noted during construction, Korbmacher Engineering, Inc. should be notified so that we can supplement our recommendations, as applicable. Final grading plans were not available at the time of preparing this report. We recommend the final grading plans be reviewed by our office prior to starting the earthwork operations. Korbmacher Engineering, Inc.