2221 1%2 S Cypress Ave - Soils Report

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7.0 RECOMMENDATIONS The following recommendations should be incorporated into the design or construction phases. 7.1 Grading 7.1.1 Site Preparation Prior to initiating grading operations, any existing vegetation, trash, debris, over-sized materials (greater than '12 inches), and other deleterious materials within fill areas should be removed from the site. 7.1.2 Surficial Soil Removals For the proposed new room extension areas, after removal of existlng concrete slabs and/or vegetation including roots. lt is recommended that the top 3 feet thick near surface earth materials should be over-excavated and re-compacted. Removal should be extended at least 3 feet beyond building lines. No deeper removal is anticipated, however, if deeper loose soils are encountered, deeper removal and re-compaction will be required. This will be determined at the field by the project geotechnical/civil engineer, based on the actual conditions exposed at the time of site grading. The removed clean on-site earth materials without any debris, vegetation and roots can be re- used as fill or back fill material. Fill, back fill material or additional imported soils should be free of organic matter and oversize material, 6 inches or greater in diameter, placed in near-horizontal loose lift not to exceed 4 inches in thickness and moisture conditioned to slightly over optimum moisture content prior to compaction. lmported soil, if any, should have a very low expansion potential and should be geotechnical observed/tested and accepted by the geotechnical/civil engineer prior to using at the site. ln general, grading at the site should be performed in accordance with the requirements of the city of Huntington Beach and under the geotechnical observation and testing of the project geotechnical / civil engineer. The compaction criteria for fill and backfill material is a minimum of 90% of the maximum density determined in accordance with ASTM Test Method D1557. Page 8