1920 GRAND AVE 2016-01-01 MF Import

GE07ECHNICAL ENGINEERING STUDY 1920 Grand _ c/� Stuchell Enterprises =�'—�` December 21, 2000 ?age 5 Following the demoiition and excavation, the ground surface where structurai filt, foundations, or slabs are to be placed should be observed by a representative of ECI. � Proofrolling may be necessary in order to identify soft or unstable areas. Proofroiiing , should be performed under the observation of a representative o` ECI. Soil ir, loose or soft areas, if recompacted and still yielding, should be overexcavated and repiaced with � structural fill to a depth that will provide a stable base beneath the eeneral structural fill. The optional use of a geotextile fabric piaced directly on the overexcavated surface may help to bridge unstable areas. The soils encountered during the site exploration are moisture sensitive due to their high fines content. As such, in an exposed condition, they will become dis�:�rbed from normal construction activity, especially when in a wet or saturated condition. Once disturbed, in a wet condition, they will be unsuitable for support of foundations, slabs, or pavements. Therefore, during construction where these soils are exposed and will support new structures, care must be exercised not to disturb their condition. Considerstion should be given to placement of rock or other methods to protect exposed native, .indisturbed soils that will support foundations or new structural fill. If disturbed conditions develop, the affected soils must be removed and replaced with structural fill. The depth of removal will be dependent on the Ievel of disturbance developed during construction. Given the above, a summer earthwork schedule is recommended. Structural fill is dafined as compacted fill placed under buildings, roadways, slebs, 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 in accordance with ASTM Test Designation D-1557-91 (Modified Proctorl. �- The fill materials should be placed at or near their optimum moisture content. Fill under L pavements and walks should also be placed in horizontal lifts and compacted to 90 percent of maximum density except for the top twelve (12) inches, which should be compacted to 95 percent of maximum density. � t � t L Ie,rm ca,.u�c,nn. �na � ti L