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2422 W. Marty Lane <br /> October 2, 2025 <br /> Page: 2 <br /> <br /> <br /> <br />Field Exploration and Laboratory Testing <br /> <br />Field Exploration. The subsurface conditions were explored by drilling one boring by means of a <br />handheld auger. The depth of the boring is about 5 feet below the existing ground surface. The <br />approximate location of the boring is shown on the Boring Location Map in Figure 2. Groundwater <br />was not encountered during our drilling. Details of the field exploration, including the log of the <br />boring, are presented in Appendix A. <br /> <br />Laboratory Testing. Soil samples considered representative of the subsurface conditions were tested <br />to obtain or derive relevant physical and engineering soil properties. Laboratory testing included <br />moisture content and insitu density, expansion index and sieve analyses. <br /> <br />Moisture content and insitu density test results are shown in the Boring Logs in Appendix A. The <br />remaining laboratory test results are presented in Appendix B. Descriptions of the test methods are <br />also included in Appendix B. <br /> <br /> <br />Subsurface Soil Conditions <br /> <br />The subject site of the proposed ADU is predominantly underlain by silty sand with trace of fine <br />gravel. The consistency of the encountered subsurface soils materials is medium dense with damp <br />moisture content. No groundwater was encountered during our drilling. <br /> <br /> <br />Conclusions and Recommendations <br /> <br />1. Foundation and Slab Design <br /> <br />The proposed development will not have an adverse impact on the existing nearby structures. The <br />proposed site is suitable for the intended use provided all the following recommendations are <br />implemented. <br /> <br />The following foundation recommendations were prepared without any information about the <br />maximum and average column loads of the new building. Once the information is available, the <br />following recommendations may be revised to reflect the actual conditions of the proposed building. <br />The foundation criteria given below have been generally observed to be practical in mitigating the <br />potential structural damage due to very low soil expansion. <br /> <br /> <br /> <br /> <br />