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CTA Project No. 19-0035-001-01 02222-3 Golden Shores Street Lighting <br />October 12, 2020 SIB Bid No. 20-09-01 <br />3.02 REMOVAL OF WATER <br />A. General: It is a basic requirement of these Specifications t hat excavations shall be free <br />from water before pipe or structures are installed. <br />B. The CONTRACTOR shall provide pumps, and other appurtenant equipment necessary <br />to remove and maintain water at such a level as to permit construction in a dry condition. <br />The CONTRACTOR shall continue dewatering operations until backfilling has <br />progressed to a sufficient depth over the pipe to prevent flotation or movement of the <br />pipe in the trench or so that it is above the water table. If at any point during the <br />dewatering operation it is determined that fine material is being removed from the <br />excavation sidewalls, the dewatering operation shall be stopped if acceptable to the <br />ENGINEER. If any of the subgrade or underlying material is disturbed by movement of <br />groundwater, surface water, or any other reason, it shall be replaced at the <br />CONTRACTOR's expense with crushed stone or gravel. <br />C. Disposal: Water from the trenches and excavation shall be disposed of in such a manner <br />as will not cause injury to public health, to pub lic or private property, to the Work <br />completed or in progress, to the surface of the streets, cause any interference with the <br />use of the same by the public, or cause pollution of any waterway or stream. The <br />CONTRACTOR shall submit his proposed methods of handling trench water and <br />locations at which the water will be disposed of to the ENGINEER for review and shall <br />receive acceptance before starting the excavation. Disposal to any surface water body <br />will require silt screens to prevent any degration in the w ater body. It shall be the <br />CONTRACTOR’s responsibility to obtain all the necessary dewatering permits from the <br />appropriate permitting agencies prior to starting excavation. <br />3.03 COMPACTION AND DENSITIES <br />A. Compaction of backfill shall be 98 percent of the maximum density where the trench is <br />located under structures or paved areas, and 95 percent of the maximum density <br />elsewhere. More thorough compaction may be required when Work is performed in other <br />regulatory agencies jurisdictions, such as the DOT. Methods of control and testing of <br />backfill construction are: <br />1. Maximum density of the material in trenches shall be determined by ASTM D <br />1557. <br />2. Field density of the backfill material in place shall be determined by ASTM D <br />1556 or D 2922. <br />B. Testing: Laboratory and field density tests, which in the opinion of the ENGINEER are <br />necessary to establish compliance with the compaction requirements of these <br />Specifications, shall be ordered by the ENGINEER. The CONTRACTOR shall <br />coordinate and cooperate with the testing laboratory. The testing program will be <br />implemented by the ENGINEER establishing depths and locations of tests. Modifications <br />to the program will be made as job conditions change. <br />C. Trench backfill which does not com ply with the specified densities, as indicated by such <br />tests, shall be reworked and recompacted until the required compaction is secured, at no <br />additional cost to the CITY. The costs for retesting such Work shall be paid for by the <br />CONTRACTOR. <br /> <br /> - END OF SECTION -