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kn KLEINFELDER <br /> File No. 20-2182-24 <br /> February 20, 1990 <br /> outside building areas may be jetted. However, if jetting is <br /> performed, sufficient time should be set aside to allow <br /> consolidation to occur. In addition, density tests should be taken <br /> to confirm the recommended compaction. <br /> Generally if construction is performed during the winter or early <br /> spring months, December through April, the surface and near surface <br /> soils are usually adequately moisture conditioned due to rainfall . <br /> However, if moisture conditioning is necessary, long-term <br /> sprinkling, with dikes to control runoff, generally produces <br /> uniform results . This method can take time, however, often on the <br /> order of several days . We recommend that moisture conditioning be <br /> performed immediately prior to placement of floor slabs . Moisture <br /> tests should be taken to confirm that the increased moisture <br /> content has been achieved. <br /> It is important that the subgrade soils under exterior concrete be <br /> moisture conditioned in the same manner as suggested for floor <br /> slabs . Moisture conditioning should extend at least 2 feet beyond <br /> such areas . It is also recommended that exterior concrete such as <br /> walkways be placed in approximately square patterns not more than <br /> approximately 200 square feet in size. Suitable divider strips <br /> should be used at placement joints . Where concrete curbs are used <br /> to isolate landscaping in or adjacent to the parking areas, we <br /> recommend the curbs extend a minimum of 6 inches into the soils to <br /> provide a moisture barrier. <br /> 11 <br />