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625 Cypress Avenue <br />Geotechnical Investigation <br /> <br />Project No. W1895-88-01 - 18 - April 23, 2024 <br />7.4 Grading <br />7.4.1 Grading is anticipated to include excavation of site soils for proposed foundations, slabs, and <br />utility trenches, as well as placement of backfill for utility trenches. <br />7.4.2 A preconstruction conference should be held at the site prior to the beginning of excavation <br />operations with the owner, contractor, civil engineer, geotechnical engineer, and building <br />official in attendance. Special soil handling requirements can be discussed at that time. <br />7.4.3 Earthwork should be observed, and compacted fill tested by representatives of Geocon West, <br />Inc. The existing fill and alluvial soils encountered during exploration is suitable for <br />re-use as an engineered fill, provided any encountered oversize material (greater than 6 <br />inches) and any encountered deleterious debris is removed. <br /> <br />7.4.4 Grading should commence with the removal of all existing improvements from the area to <br />be graded. Deleterious debris such as wood and root structures should be exported from the <br />site and should not be mixed with the fill soils. Asphalt and concrete should not be mixed <br />with the fill soils unless approved by the Geotechnical Engineer. All existing underground <br />improvements planned for removal should be completely excavated and the resulting <br />depressions properly backfilled in accordance with the procedures described herein. Once a <br />clean excavation bottom has been established it must be observed and approved in writing <br />by the Geotechnical Engineer (a representative of Geocon West, Inc.). <br />7.4.5 Foundations should derive support in the undisturbed alluvial soils found at and below a <br />depth of 5 feet. The presence of existing artificial fill in proposed foundation excavations <br />must be field verified by Geocon during construction activities. Foundations should be <br />deepened as necessary to penetrate through the existing artificial fill at the direction of the <br />Geotechnical Engineer. <br />7.4.6 Performing open excavations adjacent to and deeper than existing foundations could <br />potentially remove lateral support and/or undermine the existing foundations and are not <br />acceptable. Excavation for grading and/or construction of new foundations adjacent to <br />existing foundations will require special excavation measures. Recommendations for <br />temporary excavations are provided in Section 7.10. <br />7.4.7 Where new concrete slab-on-grade is to be constructed, it is recommended that any soils <br />disturbed during construction activities be properly compacted for slab support.