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DocuSign Envelope ID:81E05E8E-EED7-43D3-8B8A-08110E72140A <br /> SECTION 31 00 00 - CLEARING, GRADING AND EXCAVATION <br /> between step-downs shall be of poured concrete of the same cross- <br /> section as the footing connected. <br /> T. Where blasting is required, it shall be done by experienced personnel and <br /> every needed precaution taken to protect persons and property from <br /> injury. No blasting for rock excavation will be allowed whenever there are <br /> existing structures or pipelines except by permission of the Engineer, and <br /> only when the Contractor provides a suitable vibration-monitoring device <br /> and can demonstrate that vibrations to adjacent structures and piping will <br /> not cause damage. All responsibility for damages rest on the Contractor. <br /> U. Backfill around structures and other facilities shall be completed as soon <br /> as possible, in conformance with the following: <br /> Backfill not required for structural fill shall consist of clean acceptable <br /> earth, free from trash, brick bats, wood, large rocks, vegetable matter and <br /> other injurious material. It shall be placed in 8" layers and thoroughly <br /> compacted by mechanical tamps to 90% of the Standard Proctor <br /> Maximum Dry Density as defined by ASTM D-698 as amended, with any <br /> subsequent settlement being refilled. Care shall be taken to protect piping <br /> or other utilities during backfill operations. Excessively wet, soupy or <br /> mucky material shall be removed from the area around structures prior to <br /> backfill being placed and no such material shall be used for backfill <br /> purposes. <br /> Backfill around non-waterholding structures shall be completed upon <br /> completion of the structure above finish grade, and all piping has been <br /> properly installed and tested. Unless approved by the Engineer, <br /> structures that are to contain liquids shall not be backfilled until <br /> successfully tested for leakage. It shall be the responsibility of the <br /> Contractor to protect all structures from damage due to floatation prior to <br /> backfill being placed. <br /> 3.4 FINE GRADING, PLACEMENT OF TOPSOIL, AND CLEANUP <br /> A. Upon completion of excavation, grading, and backfill, the entire work area <br /> shall be fine graded and dressed off to the indicated grades. At least 4" of <br /> topsoil shall be placed on all disturbed non-paved areas, except for the <br /> interior slopes and bottom of storage lagoon, with the final level of topsoil <br /> conforming to the design finished elevations. Topsoil shall be obtained <br /> from off-site sources if required. Topsoil shall be free of debris, sticks, <br /> excessive amounts of weeds, and other deleterious substances. <br /> B. Upon completion of the fine grading and placement of topsoil, the entire <br /> site shall be cleaned up and dressed off and all excess material and <br /> debris disposed of to the Owner's and the Engineer's satisfaction. All <br /> areas to be seeded shall be "broom dragged" and/or hand raked. <br /> Orange County DAA PN R00592-225N2 <br /> Walnut Grove Wastewater System January, 2021 <br /> 31 00 00-8 <br />