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<br /> <br />ASSOCIATED SOILS ENGINEERING, INC. Project No.: 7160.23 <br />2860 Walnut Avenue, Signal Hill CA 90755 January 23, 2024 <br />Tel: (562) 426 -7990 * Fax: (562) 426 -1842 Page 13 <br />5.2.3 Remedial Grading: <br />a) Proposed Building and Ancillary Improvements: <br />To provide competent bearing support for the proposed restroom building and to reduce <br />potential static settlements, it is recommended that on-site soils within the footprint of the <br />restroom building be overexcavated and removed uniformly to a minimum depth of four (4) <br />feet below existing grade or finish grade, whichever is lower, and replaced with properly <br />compacted fill such that the building foundation is supported on a re-engineered, compacted <br />fill layer. The excavation bottom should be near uniform. The overexcavation should extend <br />laterally to a minimum distance of four (4) feet beyond the restroom perimeters, wherever <br />possible. The fill should be compacted to at least 90 percent relative compaction with minimum <br />moisture content of two (2) percentage points above optimum moisture content. On-site <br />subgrade soils at their present state generally exhibit an EI within the preferred value and, thus, <br />are deemed suitable for re-use as fill. <br /> <br />For foundations supporting ancillary improvements, it is recommended that on-site soils within <br />the footprints of the ancillary improvements be overexcavated and removed uniformly to a <br />minimum depth of three (3) feet below existing grade or finish grade, whichever is lower, and <br />replaced with properly compacted fill such that the foundations for ancillary improvements are <br />supported on a re-engineered, compacted fill layer. The excavation bottoms should be near <br />uniform. The overexcavation should extend laterally to a minimum distance of three (3) feet <br />beyond structure perimeters, where possible. <br /> <br />Soils exposed at excavation bottoms to a depth of one (1) foot should be scarified, reworked <br />and recompacted to exhibit a minimum 90 percent relative compaction with a minimum <br />moisture content of two (2) percentage points above optimum moisture content, prior to <br />receiving fill placement. The exposed excavation bottom should be observed, tested, and <br />approved by the Geotechnical Consultant prior to placing compacted fill. <br /> <br />b) Exterior Slab-on-Grade/Concrete Flatwork/Hardscape/Pavement Support: <br />For the purpose of reducing future unsightly and uneven movements and cracks of any exterior <br />slab-on-grade, concrete flatwork, hardscape, or pavement, it is recommended that subgrade <br />soils to a minimum depth of eighteen (18) inches below the bottom of and eighteen (18) inches <br />laterally beyond the footprint of exterior concrete slab-on-grade/concrete flatwork/hardscape/ <br />pavement should be overexcavated then backfilled and recompacted with suitable fill soils <br />consisting of “Very Low” to “Low” expansive site or import material (EI ≤ 35), compacted to at <br />least 90 percent relative compaction with a minimum moisture content of two (2) percentage <br />points above optimum moisture content. Prior to placement of compacted fill, the upper six (6)