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SIGNET STL Project No. 0010771 <br /> Page 6 <br /> R!m ng Labs <br /> This compaction effort will stabilize the upper soils and locate any unsuitable or pliant areas not found <br /> during our field investigation. <br /> Groundwater Influence on Structures/Construction <br /> Based on our findings and historical records, it is not anticipated that groundwater will rise within the <br /> zone of structural influence or affect the construction of foundations and pavements for the project. <br /> However, if earthwork is performed during or soon after periods of precipitation, the subgrade soils <br /> may become saturated, pump or not respond to densification techniques. Typical remedial measures <br /> included discing and aerating the soil during dry weather, mixing the soil with dryer materials; <br /> removing and replacing the soil with an approved fill material; or mixing the soil with an approved <br /> time or cement product. Our firm should be consulted prior to implementing remedial measures to <br /> observe the unstable subgrade conditions and provide appropriate recommendations. <br /> Site Preparation <br /> General site clearing should include removal of vegetation, existing utilities, structures including <br /> foundations, basement walls and floors, existing stockpiled soil, trees and associated root systems, <br /> rubble, rubbish and any loose and/or saturated materials. Site stripping should extend to a minimum <br /> depth of two to four inches, or until all organics in excess of 3 percent by volume are removed. <br /> Deeper stripping may be required in localized areas. These materials will not be suitable for use as <br /> Engineered Fill. However, stripped topsoil may be stockpiled and reused in landscape or non- <br /> structural areas. <br /> Following stripping operations, the upper 18 inches of existing soils should be scarified, properly <br /> moisture conditioned, and compacted to a minimum of 90 percent of the maximum density as <br /> determined by ASTM Test Method D1557, If import fills are required to achieve the appropriate final <br /> grades, they should be placed as Engineered Fill. Engineered Fill should be placed in 6 to 8-inch loose <br /> lifts, properly moisture conditioned, and compacted to a minimum of 90 percent of the maximum <br /> density as determined by ASTM Test Method D1557. <br /> The upper soils, during wet winter months, become very moist due to the absorption characteristics of <br /> the soil. Earthwork operations performed during winter months may encounter very moist unstable <br /> soils, which may require removal to grade a stable building foundation. Project site winterization <br /> consisting of placement of aggregate base and protecting exposed soils during the construction phase <br /> r should be performed. <br /> Excavations, depressions, or soft and pliant areas extending below planned finished subgrade levels <br /> should be cleaned to firm, undisturbed soil and backfilled with Engineered Fill. Any buried structures <br /> encountered during construction should be properly removed and backfilled. In general, any septic <br /> tanks,_ debris pits cesspools or srml ar structures should be entirely removed. Concrete footings <br /> should be removed to an equivalent depth of at least 3 feet below proposed footing elevations or as <br /> recommended by the Soils Engineer. Any other buried structures should be removed in accordance <br /> with the recommendations of the Soils Engineer. Resulting excavations should be backfilled with <br /> Engineered Fill. <br /> '— 1417 No.Market Blvd.,Suite 1 • Sacramento,CA 95834 • (916)568-5858 • Fax: (916)568-5813 <br />