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<br />3.07 SHEETING <br /> <br />A. Sheeting and bracing shall be provided and continuously maintained where <br />required to prevent damage to property, injury to persons, or erosion and cave- <br />ins. <br /> <br />B. Where practical sheeting shall be driven prior to excavation to avoid loss of <br />material to be retained. <br /> <br />C. When excavating below the sheeting, care shall be taken to avoid trimming that <br />will cause voids in the banks to be retained. <br /> <br />D. Sheeting and bracing shall be removed as backfilling progresses and shall be <br />completely removed when the trench has been backfilled to at least 1/2 its <br />depth or when removal will not endanger construction or adjacent structures. <br /> <br />E. Voids caused by removal shall be backfilled immediately with sand or other <br />approved fine material and compacted by ramming or by watering. <br /> <br />F. When required and directed in writing, by the ENGINEER, sheeting, bracing, or <br />shoring shall be left in place and the top shall be cut off neatly at an approved <br />elevation below finished grade. <br /> <br />3.08 SEQUENCE OF EXCAVATION <br /> <br />A. Excavation in a given area shall proceed from the deepest excavation to the <br />shallowest excavation to avoid undermining completed roadways, utilities or <br />structures. <br /> <br />3.09 DEWATERING <br /> <br />A. Utilities are to be laid "in the dry." <br /> <br />1. Trench excavations may be dewatered by using one or more of the following <br />methods: <br /> <br />a. Well point systems: <br /> <br />1) Shall be efficient enough to lower the water level in advance of the <br />excavation and maintain the level continuously to keep the trench <br />bottom and sides firm and dry <br /> <br />2) Shall designed especially for this type of service, and the pumping <br />unit used is to be capable of maintaining a high vacuum and at the <br />same time of handling large volumes of air as well as water. <br /> <br /> <br />City of Sunny Isles Beach <br />NE 174th Street Roadway Improvements <br />02300 - 9 Earthwork <br />14-1758 / 09-19-2014 <br />