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Geotechnical Engineering Investigation Page 10 of 24 New Residential Subdivision 2706 Pock Lane Stockton, CA 95205 March 30, 2021 CTE Job # 25-1097G 4.12 Flooding Hazard Potential Based on FEMA flood zone maps for San Joaquin County Unincorporated Areas, California,Map No. 06077C0490F, (2009)to assess the potential for flooding of the site. Based on a review of the noted map, the parcel is designated as "OTHER FLOOD AREAS — ZONE X", areas of 0.2% annual chance flood; areas of 1% annual chance flood with average depths of less than 1 foot or with drainage less than 1 square mile; and areas protected by levees from 1%annual chance flood. 5.0 CONCLUSIONS AND RECOMMENDATIONS We conclude that the proposed construction is feasible from a geotechnical standpoint, provided the recommendations in this report are incorporated into the design of the project. Based on our investigation, the major geotechnical factor affecting the development of the site is the existence of near surface highly expansive soils. Based on the soil properties, the near surface will exhibit post construction shrinkage and swelling upon drying and wetting possibly resulting in structure and improvement distress if not treated. It should be noted that the remedial grading and pre- saturation of the site soils will substantially reduce but not eliminate the potential for post construction cosmetic distress of structures and improvements. Recommendations for the design and construction of the proposed structures and associated improvements are included below. Continuous and isolated spread footings or post tensioned slab foundations are considered suitable for the site to support the proposed structures if the site preparation, grading and earthwork are performed as described in Sections 5.1, and 5.2. All structure footings should be supported entirely on engineered and/or treated fill. 5.1 Site Preparation Project site stripping should include the demolition, removal and disposal of all asphalt and concrete debris, vegetation, other organic material in all proposed building pad and improvement areas. Visible concrete debris and refuse were identified in the central area of the site, suggesting that similar material may be encountered in proposed improvement areas. Loose,wet or otherwise unstable soil in the proposed improvement area should be excavated and evaluated by CTE for r^1 INC