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Geotechnical Engineering Investigation Page 9 of 24 New Residential Subdivision 2706 Pock Lane Stockton, CA 95205 March 30, 2021 CTE Job # 25-1097G not likely in an area of relatively dense soil deposits and low seismic frequency and ground acceleration. 4.8 Earthquake Induced Landsliding Based on information available on the California Geological Survey (CGS) website (http://maps.conservation.ca.gov/c sg /lsi/)the subject site is not currently mapped within a State of California Seismic Hazard Zone for seismically induced landsliding. 4.9 Tsunamis and Seiche Evaluation Based on site location, elevation, and tsunami hazard mapping from the CGS website (http://maps.conservation.ca.gov/cgs/informationwarehouse/index.html?map=tsunami) the site is not in a tsunami inundation hazard zone. In addition, oscillatory waves (seiches) are considered unlikely due to the absence of large confined bodies of water in the site area. 4.10 Compressible and Expansive Soils Surficial soil materials encountered at the site are described as a very stiff to hard low plasticity sandy clays (CL). Based on our evaluation these surficial soil deposits would not be considered subject to significant compression under anticipated loads. The near surface soils encountered exhibited a high expansion potential, with an expansion index (EI) of 103. If not treated, these soils could exhibit post construction volume change upon drying and wetting and cause damage to foundations, structures, and flatwork. Treatment options to mitigate this hazard are presented later in this report. 4.11 Soil Corrosion Potential Assessment for potential of soil corrosion on construction materials was not included as part of this investigation. We recommend your corrosion engineer determine the potential corrosive characteristics of the on-site soils with respect to contact with the various underground materials that will be used for project construction.