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9/2/2020 <br /> <br />31 20 00 EARTH MOVING Page 8 of 13 <br />1. Clearance: As indicated. <br />C. Trench Bottoms: Excavate and shape trench bottoms to provide uniform bearing and support of <br />pipes and conduit. Shape subgrade to provide continuous support for bells, joints, and barrels of <br />pipes and for joints, fittings, and bodies of conduits. Remove projecting stones and sharp objects <br />along trench subgrade. See Plan Details <br />D. Trenches in Tree- and Plant-Protection Zones: <br />1. Hand-excavate to indicated lines, cross sections, elevations, and subgrades. Use narrow- <br />tine spading forks to comb soil and expose roots. Do not break, tear, or chop exposed roots. <br />Do not use mechanical equipment that rips, tears, or pulls roots. <br />2. Do not cut main lateral roots or taproots; cut only smaller roots that interfere with <br />installation of utilities. <br />3. Cut and protect roots according to requirements in Section 01 56 39 "Temporary Tree and <br />Plant Protection." <br />3.8 SUBGRADE INSPECTION <br />A. Notify Geotechnical Engineer when excavations have reached required subgrade. <br />B. If Geotechnical Engineer determines that unsatisfactory soil is present, continue excavation and <br />replace with compacted backfill or fill material as directed. <br />C. Prepare subgrade below the building slabs and pavements per the Geotechnical Report and as <br />directed by the Geotechnical Engineer. <br />D. Authorized additional excavation and replacement material will be paid for according to Contract <br />provisions for unit prices. <br />E. Reconstruct subgrades damaged by freezing temperatures, frost, rain, accumulated water, or <br />construction activities, as directed by Geotechnical Engineer, without additional compensation. <br />3.9 UNAUTHORIZED EXCAVATION <br />A. Fill unauthorized excavation under foundations or wall footings by extending bottom elevation <br />of concrete foundation or footing to excavation bottom, without altering top elevation. Lean <br />concrete fill, with 28-day compressive strength of 2500 psi, may be used when approved by <br />Engineer. <br />1. Fill unauthorized excavations under other construction, pipe, or conduit as directed by <br />Geotechnical Engineer. <br />3.10 STORAGE OF SOIL MATERIALS <br />A. Stockpile borrow soil materials and excavated satisfactory soil materials without intermixing. <br />Place, grade, and shape stockpiles to drain surface water. Cover to prevent windblown dust. <br />DocuSign Envelope ID: 7D9ACD4F-8F6C-42B6-9ADB-C60032DB6D03