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City of Everett 31 00 00 - 4 <br /> Inductive Charging Infrastructure for Everett Transit <br /> concrete. Compact base to the density required and allow testing of compaction prior <br /> to constructing concrete forms. <br /> 3. Place footings on native soils, or properly compacted fill material. Where existing soft <br /> materials are encountered below footings, overexcavate as required by the Owner's <br /> Geotechnical Consultant or until dense native soil is encountered and backfill with lean <br /> concrete. The minimum lateral limits of the overexcavation and lean concrete backfill <br /> beneath footings shall be defined by a line extending downward and out from the outer <br /> edge of the footing at an angle of 1 H:1 V. Maintain side slopes as required by <br /> authorities having jurisdiction. <br /> H. Excavation for Pavements: Cut surface under pavements to comply with cross-sections, <br /> elevations and grades as shown within a tolerance of plus or minus 0.10-foot. <br /> I. Excavation for Planting Areas: Conform to cross-sections, elevations and dimensions <br /> shown, within a tolerance of plus or minus 0.10-foot. <br /> J. Excavation for Trenches <br /> 1. Excavate trenches to the depth indicated or required. Carry the depth of trenches for <br /> piping to establish the indicated flow lines and invert elevations. <br /> 2. Where rock is encountered, carry the excavation 6 inches below the required elevation <br /> and backfill with a 6-inch layer of structural fill. <br /> 3. Grade bottoms of trenches as indicated, notching under pipe bells to provide solid <br /> bearing for the entire body of the pipe. <br /> K. Cold Weather Protection: Protect excavation bottoms against freezing when <br /> atmospheric temperature is less than 35 degrees F. <br /> 3.2 SUBGRADE VERIFICATION <br /> A. Following site preparation and excavation for the building, paved surfaces and roadways, <br /> the exposed subgrades shall be observed and approved by the Owner's Geotechnical <br /> Consultant. <br /> B. Overexcavate any soft, loose or disturbed soils identified by the Geotechnical Consultant <br /> and replace with compacted structural fill. <br /> C. If required by Geotechnical Consultant, provide equipment and labor for proof rolling. <br /> 3.3 BACKFILL AND FILL <br /> A. For backfill of all excavations use material sampled and tested by the Owner's <br /> Geotechnical Consultant. <br /> B. All fill used for the following shall be structural fill: <br /> 1. Fill beneath footings and foundations. <br /> 31 00 00 - 4 EARTHWORK <br />