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Shrinkaae/Subsidence Removal and recompaction of the near surface fill and alluvial soils is estimated to result in an average shrinkage of 8 to 13 percent. Minor ground subsidence is expected to occur in the soils below the zone of removal, due to settlement and machinery working. The subsidence is estimated to be 0.13: feet. This estimate may be used for grading in areas that are underlain by existing native alluvial soils. These estimates are based on previous experience and the subsurface conditions encountered at the boring locations. The actual amount of subsidence is expected to be variable and will be dependant on the type of machinery used, repetitions of use, and dynamic effects, all of which are difficult to assess precisely. Grading and Foundation Plan Review No grading or foundation plans were available at the time of this report. It is therefore recommended that we be provided with copies of the preliminary plans, when they become available, for review with regard to the conclusions, recommendations, and assumptions contained within this report. 6.3 Site Grading Recommendations The grading recommendations presented below are based on the subsurface conditions encountered at the boring locations and our understanding of the proposed development. We recommend that all grading activities be completed in accordance with the Grading Guide Specifications included as Appendix D of this report, unless superseded by site-specific recommendations presented below. Site Strippinq and Demolition Any existing improvements that will not remain in place for use with the new development should be removed in their entirety. This should include all foundations, floor slabs, utilities, and any other subsurface improvements associated with the existing building. Any existing pavements that will remain in place for use with the new development should be protected from damage by construction traffic. Demolition debris should be disposed of offsite. If desired, asphalt and concrete debris may be crushed to a maximum 2-inch particle size, mixed with on- site soils, and incorporated into new structural fills. Any organic materials from demolished landscape planters should be removed and disposed of off-site, or in non-structural areas of the property. The actual extent of site stripping should be determined by the geotechnical engineer at the time of grading, based on the organic content and the stability of the encountered materials. Treatment of Existing Soils: Building Pad It is recommended that remedial grading be performed within the proposed building area to remove the existing undocumented fill soils. Based on conditions encountered at the boring 1=2'SOUTHERN CALiFORNIA GEOTECHNICAL G&M Convenience Store #72 - Santa Ana, CA Project No. 16G123-1R Page 15