CITY PROJECT - 1821 & 1823 E Chestnut Ave - Plan

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ASSOCIATED SOILS ENGINEERING, INC. Project No.: 7160.23 2860 Walnut Avenue, Signal Hill CA 90755 January 23, 2024 Tel: (562) 426 -7990 * Fax: (562) 426 -1842 Page 26 chloride corrosion under Exposure Class “C0” stipulated in Tables 19.3.1.1 and 19.3.2.1 of ACI 318- 19 may be required as a result of the soluble chloride content tested. However, the compliance with the corrosivity criteria stipulated in Section 5.2.8 above will ensure that no other particular reinforcement protection. 5.9 Utility Trenches All trenches should be backfilled with approved fill material compacted to relative compaction of not less than 90 percent. Care should be taken during backfilling to prevent utility line damage. The on-site soils may be used for backfilling utility trenches from one (1) foot above the top of pipe to the surface, provided the material is free of organic matter and deleterious substances. Any soft and/or loose materials or fill encountered at pipe invert should be removed and replaced with properly compacted fill or adequate bedding material. The on-site soils may be considered suitable for bedding or shading of utilities. Site or imported soils for pipe bedding should consist of non-expansive granular soils. Bedding materials should consist of sand with a tested Sand Equivalent, SE, value (ASTM D 2419-22 Test Method) not less than 30. If sandy soils are used for trench backfill, the backfill should be topped with a minimum 2-foot thick cap of compacted fine-grained, cohesive soil. Also, a minimum 10-foot length of trench at the entrance and exit points of structures should be backfilled with fine-grained soils to serve as a plug to prevent water migration into structure foundation support zones. The walls of temporary construction trenches may not be stable when excavated nearly vertical due to potential for caving. Shoring of excavation walls or flattening of slopes will be required if excavation depths greater than 4 feet are necessary. Trenches should be located so as not to impair the bearing capacity of soils or cause settlement under foundations. As a guide, trenches parallel to foundations should be clear of a 45-degree plane extending outward and downward from the edge of the foundations. All work associated with trenches, excavations and shoring must conform to the State of California Safety Code (CAL-OSHA). 5.10 Plan Review, Observations and Testing Once foundation and grading plans are completed, they should be forwarded to the Geotechnical Consultant for review of conformance with the intent of these recommendations and criteria presented in the pertinent sections of this report. All excavations should be observed by a representative of this office to verify minimum embedment depths, competency of bearing soils and that the excavations are free of loose and disturbed materials. Such observations should be made prior to placement of any fill, reinforcing steel or concrete. All grading