11611 AIRPORT RD Geotech Report 2018-01-02 MF Import

, � (ieotectmirul I?ngmcermg Report Pruposed Atui Warehouse Muy 1 l, 2001 CG F��le No. 1121 Page 7 fill. 'fhe use of on .n� soil as strucmral lill will be dependeut on moisture content control. M.!st of thz s'ite soils at the time of site explorations were wet of optimum moisl�re content. These soils may nced moisture condition�ng to be near optimum if they are planned to be used as stntctural fill. "Chis may include drying the soils, or addmg morsture. The acmal method ro bnng the site soils to near optimum moisture content can be dztermined based on the soil and weat':,er conditions at the time of till placement. We expect that compaction of the native soils to shuctural fill specifications would be difficult, if not impossible,during wet weather. Fill Placement Following subgrade prepa�ation, placeme.t of the strnctural till may proceed. Fill should be placed in 8- to lU-inch-thirk uniform lifrs, and each lifr should be spread evenly and bc Ihoroughly compacted prior to plzce�„znt of subsequent lifts. All strucmral fill underlying building areas, and within a depth oi 2 feet below pavement and sidewalk subgrade, should be compacted to at leas[ 95 nercent of its maximum dry e�ensity. blaxi;num dry density, in this report, refers to that density as determined by the ASTM D 1557 compaction test procedure. F�fl more than 2 feet beneath side�valks and pavement subgrades should be compacted to a[ least 90 percent of the maxirrum dry density. The moisture contcnt of the soil to be compacted should be within about 2 percent of optimum so that a readily compactable condition exists. It may be necessary to overexcavate and remove wet surficial soils in cases where drying to a compactable condition is not feasible. All eompaction shotild be accomplishz� by equipment of a type and size sufficient to attain [he desired degree of compsction. ; Where structural fill is placed over the existing fill in Ihe pavement and slab-on-grade area;, it may be difficult to achieve the recommended levels of compaction. ";'o improve the performance o�structures placed over thc existing loose fill, it is best to achieve the recommended level of comp�rtion. However, settlement associated with rll compacted to slighti� less than ' recommended will be significanNy less than �f all the existing fill was left in place. Pavement Areas � �I Pavement subgrade shoutd be prepared as outlined in the Site Preparation and Grading � subsection. It will be important to proof roll the pavement areas pnor to paving. The,proof roll should be completen �oith a heavy, rubber-tired piece of equipme�t, such as a loaded 10-yard dump tn�ck Areas that yield under proof-rolling eyuipmen2 should be repaired. The proof-roll Cornerstone Geotechnical, Inc. �