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I <br /> Project No. 90161.e <br /> 7 June 1990 <br /> ` k General gradinq <br /> 1. After the native soil has been properly prepared, material <br /> ,::: <br /> generated from excavations on the site excluding deleterious <br /> material may be utilized as engineered fill. The expansive <br /> ' materials must be placed in thin horizontal lifts not to exceed 8 <br /> L4 inches in -uncompacted thickness. The fill should be moisture <br /> t <br /> conditioned as necessary and compacted to a minimum of 87% <br /> F <br /> IN relative compaction but not more than 92% relative compaction and <br /> at a moisture content at least 3% above optimum, based on the <br /> ASTM D1557-78 Test Method. Non-expansive soils should be <br /> compacted to at least 9o% relative compaction at above moi.sture <br /> content. <br /> s <br /> f 2. Seasonal limits - The near-surface soils may become partially <br /> or completely saturated during the rainy season. Commencement of <br /> may be difficult since <br /> grading operations during this time period <br /> the saturated materials may not be compactable. and they may not <br /> support normal construction equipment. It is therefore <br /> recommended that consideration be given to the seasonal limit of <br /> k <br /> the grading operations on the site. <br /> 3. Excavation - Except for the presence of underground <br /> - -- - - - <br /> appurtenanceaj--no difficulties are anticipated for excavation <br /> � ration should be given to seasonal moisture <br /> operations. Conside . <br /> E <br />