4102 RUCKER AVE SAFEWAY FUELING STATION 2016-01-01 MF Import

GEOTECHNICAL ENGINEERING STUDY Inform, Inc May 9, 2002 E-8493-5 Page 6 Structural fill is defined as compacted fill placed under buildings, roadways, slabs, pavements, or other load-bearing areas. Structural fill under floor slabs and footings should be placed in horizontal lifts not exceeding twelve (12) inches in loose thickness and compacted to a minimum of 90 percent of its laboratory maximum dry density determined ;n accordance vdith ASTM Test Designation D-1557-91 (Modified Proctor). The fill materials should be placed at or near their optimum moisture content. Fill under pavements and walks should also be placed in horizontal lifts and compacted to 90 percent of the maximum dry density except for the top twelve (12) inches, which should be compacted to 95 percent of the maximum dry density. During dry weather, most granular soils that are compactable and non-organic can be used as structural fill. Based on the results of our laboratory tests, some of the on-site soils at the time of our exploration were above their optimum moisture content and may not be suitable for use as structural fill if they cannot be dried back to optimum levels. In addition, laboratory testing indicates the site soils have from 13 to 62 percent fines passing the No. 200 sieve. Soil with fines in excess of approximately 5 percent fines passing the No. 200 sieve will degrade if exposed to excessive moisture. Compaction and grading will be difficult if the soil moisture increases significantly above its optimum condition. If the site soils are exposed to excessive moisture or cannot be adequately compacted, then it may be necessary to import a soil that can be compacted. During dry weather, granular compactable soil with a maximum grain size of four inches can be used. Fill for use during wet weather should consist of a fairly well-graded granular material having a maximum grain size of four inches and no more than 5 percent fines passing the No. 200 sieve based on the minus 3/4-inch fraction. A contingency in the earthwork budget should be included for this possibility. ECI should review the gradation of imported soil intended for use as structural fill. Foundations Based on the results o( our study, it is our opinion the proposed kiosk and fueling island canopy can be supported on convontional spread and continuous footing toundation systems br.arinp on competent native soil or on strucWral fill. Inrlh C�rb�ullnnN. Inr.