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7.3 Temporary Trench Excavation and Backfill <br />All trench excavations should conform to CAL-OSHA and local safety codes. All utilities <br />trench backfill should be brought to near optimum moisture content and then compacted to <br />obtain a minimum relative compaction of 90 percent of ASTM D-1557-07. <br />7.4 Nonstructural concrete Flatwork: Sidewalk and Private Driveway <br />4 inches (sidewalk) and 5 inch (driveway) minimum thickness reinforce concrete with # 3 at <br />24" on center. Crack control with saw cut or deep tool joint to a minimum of 1/3 the concrete <br />thickness, maximum joint spacing is 5 feet (sidewalk) and 10 feet or quarter cut (driveway) <br />whichever closer. <br />8.0 CORROSION POTENTIAL <br />Sulfate attack was not observed for the existing buildings in this subjected area. Type ll <br />cement with concrete strength 2500 psi is recommended to use, Water-Cement ratio=0.S. <br />Other requirement from government agencies, if any, can be followed. <br />It is recommended that the subsurface soils can be corrosive to buried metal pipe. lt is <br />recommended that any underground steel utilities be blasted and given protective coating. <br />Should additional protective measures be warranted, a corrosion specialist should be <br />consulted. <br />9.O INSPECTION <br />As a necessary requisite to the use of this report, the following inspection is recommended: <br />Temporary excavations. <br />Removal of surficial soils. <br />Backfill placement and compaction. <br />. Foundation excavations. The geotechnical engineer should be notified at least 1 day in <br />Page 12