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19-2 EARTHWORK (STRUCTURE EXCAVATION & BACKFILL) . --Structure <br /> excavation and backfill shall conform to the requirements in Section <br /> 19-3 , "Structure Excavation and Backfill " , of the Standard <br /> Specifications and these. special provisions . <br /> All references to culvert excavation and culvert backfill on the <br /> plans shall be deemed to mean structure excavation and structure <br /> backfill , respectively, in the Standard Specifications and these <br /> special provisions . <br /> Structure Backfill which is outside of the paved portions of the <br /> roadway, unless otherwise specified on the plans , shall be native <br /> material selected for its resistance to erosion . <br /> Compaction Requirements : Unless otherwise shown on the plans , <br /> the compaction requirements within the limits of structure excavation <br /> for pipes and arches shall be as shown on Improvement Standard A-7 . <br /> PONDING AND JETTING will be permitted only if a maintenance bond <br /> in the amount of twenty percent (20%) of the contract price with a <br /> corporate surety approved by the County is provided . Such a bond <br /> shall be provided before final acceptance of the project by the <br /> County and shall guarantee the repair of all damage due to faulty <br /> materials or workinanshi.p provided or done by the contractor. The <br /> guarantee shall remain in effect for a period of three ( 3) years <br /> after the date of final acceptance of the project by the County . <br /> ! III 19-2 <br />