7431 EVERGREEN WAY TACO BELL 2018-01-01 MF Import

( GEOTECHNICAL ENGINEERING STUDY Taco Bell Corporation April 29, 1993 ( E-6140 Page 5 Following the stripping and overexcavation procedures, tha ground surface where structural fill, foundations (i.e., trash enclosure), asphaltic pavements or concrete slabs are to be placed should b� proofrolled. All proofrolling should be performed under the observation of a representative from this office. Soil �n any lousa or soft areas, if recompacted and still yielding, should be overexcavated and replaced with structural fill to a depth that �,vill prov;de a stabie base beneath the applicable structural loading condition. The use of a geotextile fabric piaced directly on the overexcavated surface will help to bridge unstabie areas when �ncountered. Alternatively, about six inches of 4inch to 6-inch quarry spalis can be used in lieu of the geotextile fabric. Structurai fill is defined as any fill placed under buiidings, pavements, slabs or ar.�� other load bearing areas. Structural fill placed under floor slabs and footin� should be placed in thin horizontal lifts not exceeding eight inches, and compacted to a minimum 95 percent of its maximum dry �iensity in accordance with ASTM Test Designation D-1557-78 (Modified Proctor). The fill material should be placed at or near the optimum maisture contont. Fill under pavements, trash enclosure and walks should also be placed fn lifts approximntely 8 inches in thickness, anci compacted to a minimum of 90 percent of its maximum dry density, except for the top twelve (12) inches which shouid be compacted to S5 percent of the maximum dry density. Laboratory tests indicate that the on-site fill encountered from approximately three to fourteen feet below the existing ground surtace (soil beneath the surficial layer of loose saturated saii stockpiled across the site) were above the optimum moisture content and are not suitable for use as structural fill. Therefore, it wiil be necessary tn import a granular mat�rial for use as a structural fill. Laboratory tests indicate that the fill soils contain approximately 18 to 41 percent fines, based on the minus 3/4 inch fraction, and are moisture sensitive. Thus, compaction and grading wili be difficult because the soil moisture of the sxistinp fill is above the optimum. If necessary, the moisture content can be reduced by aeration in dry weather, or by intermixing lime or cement to absorb eaccess moisture. Laboratory tests indicate that the native soils contain 13 to 43 percent fines based on the minus 3/4inch fraction, and were above the optimum moisture content. Therefore, the native soils are rtSaisture sensitive and are not suitable for use as structural fill. Structural fill which is to be placed in wet weather should consist of a granular material with a maximum size of three inches and no more than 5 percent fines psssing the No. 200 sieve based on the minus 3/4inch fractiun. During dry weather, exclusive of the open excavation� most compactible non-organic granular soil can he used as structural fill. It is recommended that any structural fill planned for on site c+se be submitted for approval prior to import. Earth Consultants, Inc.