2422 W Marty Ln Unit 2 & 3 - Plan

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2422 W. Marty Lane October 2, 2025 Page: 3 Additional expansion index tests need to be performed after completion of pad to verify that the expansion index of the underlying soils is as stated above. If the test results indicate that the underlying soils are not classified as very low expansive soils for the area of the proposed slab-on- grade, the recommendations below should be adjusted accordingly. Other professionals in the design team may have different concerns depending on their own discipline and experience. Therefore, our recommendations should be considered as minimum and should be superseded by more restrictive recommendations of other members of the design team or the governing agencies, if applicable. Footing Design. The following minimum criteria should be adopted for the footing design: a. Allowable Bearing Capacity: qall = 1,500 psf b. Minimum Footing Width: 12 inches c. Minimum Footing Depth: 18 inches d. Minimum Reinforcement: 2 # 5 bars at both the top and bottom in continuous footings Notes: i. Depth of footing is measured from the lowest adjacent grade. ii. Allowable bearing capacity may be increased by one-third for short-term wind or seismic loads. iii. The above-mentioned footing dimensions recommendations should not be considered to preclude more restrictive criteria of regulating agencies or by the structural engineer/architect. iv. The design of the foundation system should be performed by the project structural engineer, incorporating the geotechnical parameters described above. Slab Design. The following recommendations should be incorporated for the slab-on-grade design: a. The minimum thickness of slab-on-grade should be 5 inches. b. The minimum steel reinforcement for slab-on-grade should be # 4 located at mid- height on 18-inch centers both ways (or equivalent). c. A modulus of subgrade reaction of 100 lb/in2/in may be utilized for the slab design d. Moisture barrier (visqueen) of a minimum 10-mil thick should be placed-in below the slab; and located in middle of a minimum of 4 inch thick of sand that is placed underneath the slab in accordance with an equivalent method specified in Section 4.505.2.1 of the California Green Code. Concrete Flatworks. The minimum thickness for concrete flatworks is 4 inches in order to minimize potential for excessive cracks. In addition, construction joints or weakened plane joints should be provided at 6-foot frequent intervals.