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Phelan Development Holly Master Plan - Buildings H & 1 <br /> 15188.000.006 Geotechnical Exploration <br /> 3.3.5 Lateral Spreading <br /> Lateral spreading is a failure within a nearly horizontal soil zone (possibly due to liquefaction)that <br /> causes the overlying soil mass to move toward a free face or down a gentle slope. An existing <br /> canal exists along the eastern portion of the site likely used for drainage and previous site use. <br /> Based on the CPT subsurface data, it is our opinion that liquefiable or sensitive materials in the <br /> vicinity of the canal are not continuous and/or are deeper than the bottom canal elevation. Based <br /> on our analysis, it is our opinion the potential for lateral spreading to negatively impact the site is <br /> low. <br /> 3.4 FLOODING <br /> Based on our review of FEMA-issued Flood Maps, the subject site is mapped within a special <br /> flood hazard area, subject to inundation by the 1% annual chance flood. Based on the flood map, <br /> the subject site is located in Zone AE with a flood elevation of 13 feet(NAVD88). The civil engineer <br /> should review pertinent information relating to possible flood levels for the subject site based on <br /> final pad elevations and provide appropriate design measures for development of the project, if <br /> necessary. <br /> 3.5 SOIL CORROSION POTENTIAL <br /> As part of this study, we obtained representative soil samples and submitted them to a qualified <br /> analytical lab for determination of pH, resistivity, sulfate, and chloride. The results are included in <br /> Appendix B and summarized in the table below. <br /> TABLE 3.5-1: Corrosivity Test Results <br /> CHLORIDESAMPLE DEPTH PH RESISTIVITY <br /> • • • <br /> West Side, CR-1 0-2 ft 7.81 720 47.9 395.7 <br /> East Side, CR-2 0-2 ft 7.70 1050 42.5 76.1 <br /> The 2019 CBC references the 2014 American Concrete Institute Manual, ACI 318-14, <br /> Section 19.3.1 for concrete durability requirements. ACI Table 19.3.1.1 provides the following <br /> exposure categories and classes, and Table 19.3.2.1 provides requirements for concrete in <br /> contact with soil based upon the exposure class. <br /> TABLE 3.5-2: ACI Table 19.3.1.1: Exposure Categories and Classes <br /> CATEGORY • . • <br /> Not Applicable FO Concrete not exposed to freezing-and-thawing cycles <br /> Moderate F1 Concrete exposed to freezing-and-thawing cycles and <br /> F occasional exposure to moisture <br /> Freezing and Severe F2 Concrete exposed to freezing-and-thawing cycles and in <br /> thawing continuous contact with moisture <br /> Concrete exposed to freezing-and-thawing cycles and in <br /> Very Severe F3 continuous contact with moisture and exposed to deicing <br /> chemicals <br /> ENGEOPage J 10 December 13, 2021 <br /> Expect Exceltence <br />