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• Landscape irrigation should conform to the recommendations of the landscape architect and <br />should be performed judiciously to preclude either soaking or excessive drying of the foundation <br />soils. This should entail regular watering during the drier portions of the year and little or no <br />irrigation during the rainy season. Automatic sprinkler systems should, therefore, be switched to <br />manual operation during the rainy season. Good irrigation practice typically requires frequent <br />application of limited quantities of water that are sufficient to sustain plant growth, but do not <br />excessively wet the soils. Ponding and/or run-off of irrigation water are indications of excessive <br />watering. <br />Other provisions, as determined by the landscape architect or civil engineer, may also be <br />appropriate. <br />Groundwater <br />The static groundwater table at this site is considered to exist at a depth in excess of 22* feet. <br />Therefore, groundwater is not expected to impact grading or foundation construction activities. <br />6.5 Foundation Design and Construction <br />Based on the preceding grading recommendations, it is assumed that the new building pad will <br />be underlain by new structural fill soils used to replace the existing undocumented fill soils. <br />These structural fill soils are expected to extend to depths of at least 2 feet below proposed <br />foundation bearing grade. Based on the presence of potentially liquefiable soils which could <br />contribute 5 inches of total settlement, it is recommended that the building be supported on a <br />specialized foundation system. The most feasible method of foundation support is considered to <br />be a mat foundation. <br />Mat Foundation Design Parameters <br />The mat foundation may be designed using the following parameters: <br />• Maximum, net allowable soil bearing pressure: 1,500 lbs/ftz. 40·iSOO <br />• Modulus of subgrade reaction (kv,): 125 lbs/in3 <br />• It is recommended that the mat foundation incorporate a perimeter turned-down <br />edge embedded at least 18 inches below adjacent exterior grade. <br />• Minimum mat thickness: 10 inches. 4---* (9 <| <br />• If moisture sensitive floor coverings will be used within the interior of the building, <br />then the entire mat foundation should include a moisture vapor barrier below the <br />entire area of the proposed slab. The moisture vapor barrier should meet or exceed <br />the Class A rating as defined by ASTM E 1745-97 and have a permeance rating less <br />than 0.01 perms as described in ASTM E 96-95 and ASTM E 154-88. Stego® Wrap <br />Vapor Barrier, 15 mils in thickness, meets this specification. The moisture vapor <br />barrier should be properly constructed in accordance with all applicable manufacturer <br />73:9:87> SOUTHERN G&M Convenience Store #72 - Santa Ana, CA <br />CALIFORNIA -9 Project No. 16G 123-1R <br />GEOTECHNICAL Page 21