2422 W Marty Ln Unit 2 & 3 - Plan

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2422 W. Marty Lane October 2, 2025 Page: 4 Cement Type. Based on the type of subsurface soils, Type V cement and water-cement ratio of 0.45 or less may be used for concrete in contact with the on-site soils. 2. Seismic Design The most widely used technique for earthquake-resistant design applied to low-rise structures is the California Building Code (CBC). The basic formulas used in the CBC require determination of the site class, which represents the site soil properties at the site of interest. The 2022 CBC seismic zone for use in the seismic design formula is Site Class D. The Seismic Design Maps is included in Appendix C. According to Section 1803.5.12 of 2022 CBC, the potential consequences of liquefaction and soil strength loss are total and differential settlements, lateral soil movement, lateral soil loads on foundation, reduction in foundation soil-bearing capacity and lateral soil reaction and flotation of buried structures. Each and/or combination of these potential consequences of liquefaction and soil strength loss may create significant distresses to the proposed ADU and JADU. The proposed ADU and JADU maybe inhabitable and need major repair/reconstruction. The owner should be solely responsible to repair/reconstruct due to distresses from consequences of liquefaction and soil strength loss. In the case of an earthquake event on any one of several active faults in the nearby area, the site would be subjected to strong ground motion. This hazard is not unique to this site, but is endemic to all areas in Southern California region. 3. Grading and Earthwork Overexcavation/Removals. The upper 24 to 36 inches of the subsurface soil materials under the proposed location of the proposed slabs may consist of uncertified fills, roots, organic and/or be disturbed. Therefore, we recommend that all deleterious materials including concrete are discarded off site and the upper 36 inches of the subsurface materials be removed and replaced with compacted fills. Onsite soils may be reused provided all deleterious materials are removed. The extent of the removal should be within the proposed concrete slabs footprint and 3 feet beyond it, if possible. The removal bottom and compacted fill should be prepared in accordance with the recommendations stated below. Site Preparation. Vegetation, organic soil, roots and other unsuitable material should be removed from the proposed new structure. Fill Compaction. All fill and backfill to be placed in association with site development should be accomplished at slightly over optimum moisture conditions, if any. The minimum relative compaction recommended for fill is 90 percent relative compaction based on maximum dry density performed in accordance with ASTM D-1557. Fill should be compacted by mechanical means in uniform horizontal loose lifts not exceeding 8 inches in thickness.