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Project No. JB -314 24 March 2003 Page 4 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. Laboratory test results indicate the near surface soils are highly expansive and could be subject to movements with increased moisture content. These surface soils are not the best material for support of foundations, building floor slabs, and exterior flatwork/sidewalks in their present state. To help reduce the potential for heaving clayey soils, the on-site soils should be over -excavated, moisture - conditioned, and recompacted in the convenience store area as recommended in the earthwork section of this report. In addition, we recommend placing imported non -expansive fill, Class 4 material, lime -treated fill or an approved equivalent beneath concrete slabs -on -grade for the building pad area. Provided the earthwork recommendations are followed, it is our opinion that the proposed kiosk, canopy structure, and sign/monuments may be supported on a conventional foundation system established on compacted, engineered fill. As an alternate, the canopy structure and sign/monuments may be supported on drilled, cast -in place pier foundation or a deep isolated footing system established in the native soil. Proper drainage must be provided to prevent moisture from penetrating beneath foundations, concrete slabs -on -grade, and pavements. If moisture penetrates the soils beneath these areas, there could be some movement and resulting cracking/distress. Recommendations to help reduce the movement of the foundations and concrete slab -on -grade floors/flatwork are discussed in later sections of this report. 5.2 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 MKorbmacher Engineering, Inc.