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Section 02210 <br /> EXCAVATION,BACKFILLING,AND COMPACTION FOR UTILITIES <br /> for making proper joints. When groundwater is encountered, well graded crushed rock <br /> shall be used for pipe bedding and backfill (1/4 in. minimum to 3/4 in. maximum), <br /> wrapped in a geotextile fabric. <br /> 3.03 BURIED WARNING AND IDENTIFICATION TAPE <br /> Install tape above all buried pipes and conduits in accordance with manufacturer's <br /> recommendations except as modified herein. Bury tape 12 in. below finished grade; under <br /> pavements and slabs, bury tape 6 in. below top of subgrade. <br /> 3.04 GENERAL BACKFILLING <br /> Construct backfill as indicated and specified in this section. Place backfill in 8 in. <br /> maximum loose lifts unless otherwise specified. Bring up evenly on each side and along <br /> the full length of the pipe. Ensure that no damage is done to structures or their protective <br /> coatings. Compact each loose lift as specified below before placing the next lift. Do not <br /> backfill in freezing weather or where the material in the trench is already frozen or is <br /> muddy, except as authorized. Where settlements greater than the tolerance allowed herein <br /> for grading occur in trenches and pits due to improper compaction, excavate to the depth <br /> necessary to rectify the problem, then backfill and compact the excavation as specified <br /> herein and restore the surface to the required elevation. Coordinate backfilling with testing <br /> of utilities. Provide buried warning and identification tape installed in accordance with the <br /> manufacturer's recommendations. <br /> 3.05 COMPACTION <br /> A. General <br /> Compact each layer of lift of material specified so that the in-place density tested is not <br /> less than the percentage of maximum density identified herein. Use hand-operated, plate- <br /> type, vibratory, or other suitable hand tampers in areas not accessible to larger rollers or <br /> compactors. Avoid damaging pipes and protective pipe coatings. Compaction of materials <br /> by ponding and jetting is prohibited unless specifically pre-approved by the Construction <br /> Manager. <br /> Compaction testing; for trenches must be accomplished at a minimum frequency of one test <br /> for every one vertical foot of backfill for every 100 lineal feet of the alignment. <br /> B. Compaction of Pipe and Conduit Bedding and Intermediate Backfill <br /> Except as noted otherwise on plans compact to 90% of ASTM D1557 maximum density. <br /> Walnut Grove Sewer Project(Conformed) 02210-9 SA0160401 <br /> March 2008 n:1sa0160401vspecsvw,contormvdiv 2v0?210.doc <br />