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homeowners association, and/or other interested parties. This office should be notified <br />in advance of any fill placement, grading of the site, or trench backfilling after rough <br />grading has been completed. This includes any grading, utility trench and retaining wall <br />backfills, flatwork, etc. <br />Tile Flooring <br />Tile flooring can crack, reflecting cracks in the concrete slab below the tile, although small <br />cracks in a conventional slab may not be significant. Therefore, the designer should <br />consider additional steel reinforcement for concrete slabs-on-grade where tile will be <br />placed. The tile installer should consider installation methods that reduce possible <br />cracking of the tile such as slipsheets. Slipsheets or a vinyl crack isolation membrane <br />(approved by the Tile Council of America/Ceramic Tile Institute) are recommended <br />between tile end concrete slabs-on-grade. <br />Additional Grading <br />This office should be notified in advance of any fill placement, supplemental regrading of <br />the site, or trench backfilling after rough grading has been completed. This includes <br />completion of grading in the street, driveway approaches, driveways, parking areas, and <br />utility trench and retaining wall backfills. <br />Footing Trench Excavation <br />All footing excavations should be observed by a representative of this firm subsequent to <br />trenching and prior to concrete form and reinforcement placement. The purpose of the <br />observations is to evaluate that the excavations have been made into the recommended <br />bearing material and to the minimum widths and depths recommended for construction. <br />If loose or compressible materials are exposed within the footing excavation, a deeper <br />footing or removal and recompaction of the subgrade materials would be recommended <br />at that time. Footing trench spoil and any excess soils generated from utility trench <br />excavations should be compacted to a minimum relative compaction of 90 percent, if not <br />removed from the site. <br />Trenchinq/Temporary Construction Backcuts <br />Considering the nature of the onsite earth materials, it should be anticipated that caving <br />or sloughing could be a factor in subsurface excavations and trenching. Shoring or <br />excavating the trench walls/backcuts at the angle of repose (typically 25 to 45 degrees <br />[except as specifically superceded within the text of this report]), should be anticipated. <br />All excavations should be observed by an engineering geologist or soil engineer from GSI, <br />prior to workers entering the excavation or trench, and minimally conform to CAL-OSHA, <br />state, and local safety codes.Should adverse conditions exist, appropriate <br />recommendations would be offered at that time. The above recommendations should be <br />provided to any contractors and/or subcontractors, or homeowners, etc., that may perform <br />such work. <br />Pacific Development Group <br />1307 West Sunflower Avenue, Santa Ana <br />File:\server\andree4900\4976al.foundshopctr <br />W.O. 4976-Al-OC <br />November 2,2005 <br />Page 19 <br />GeoSoils, Inc.