7425 HARDESON RD BASE FILE 2016-01-01 MF Import

�i � � GEOTECHNICAL ENGINEERING STUDY Trace and Associates E-11 R80 Jul�� 19, 2005 Page G � This report has been prepared for specific application te this project only and in a manner consistent with that level of care and skill ordinarily exercised by other members of the profession currently practicing under similar conditions in this area for the exclusive use � of Trace and Associates and their representatives. No warranty, expressed or implied, is made. This report, in its entirety, should be included in the project contract documents for the information of the contractor. `I � __I � � � � � � � W W CT �� Site Preparation and General Earthwork At the time of our fieldwork, the site was being rough graded and did not contain a topsoil horizon or surface vegetation. Prior to construction, the ground surface where structural fill, foundations, slabs, or pavements are to be placed should be observed by a representative of ECI. Proofrolling may be necessary to identify soft or unstable areas. Proofrolling should be performed under the observation of a representative of ECI using a fully loaded dump truck. Soil in loose or soit areas, if recompacted and still yieiding, should be overexcavated and replaced with a granular structural fill to a depth that will provide a stable base beneath the general structural fill. The optional use of a geotextile fabric placed directly on the overexcavated surface may also help to bridge unstable areas. ECI can provide recommendations for c+eotextiles, if necessary. Structural fill is defined as compactcd fill placed under buildings, roadways, slabs, pavements, or other load-bearing area::. Structural fill under floor slabs and footings should be placed in horizontal lifts no� exceeding 12 inches in loose thickness and compacted to a minimum of 90 percent of its laboratory rr:aximum dry density determined in accordanr,e with ASTM Test Designation D-1557 (Modified Proctorl. The fill materials should be placed at or near tlieir optimum moisture content. During dry weather, most granular soils that are compactable and non-organic can bc: used as structural fill. Based on the results of our Iaboratory tests, the on-site soils at ihe time of our exploration were generally at or near their optimum moisture content and should be suitable for use as structural fill, provided the grading is conducted during dry weatlier and the soils remain near optimum levels. Based on the results of our laboratory testing on representative samples collected at our test pit locations, the site soils have a iines content in the range of 28 to greater than 50 percent passing the No. 200 sieve. Soil with fines in excess of approximately 5 percent will degrade if exposed to excessive moisture. Compaction and grading will be difficult if the soil moisture increases significantly above its optimum level. ,:,�,�, �o„s�,�,,,,�s. �„�.