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DocuSign Envelope ID:81 E05E8E-EED7-43D3-8B8A-0811 OE72140A <br /> SECTION 31 00 00 - CLEARING, GRADING AND EXCAVATION <br /> discharge lines, and other dewatering system components <br /> necessary to convey water away from excavations. <br /> 2. Establish and maintain temporary drainage ditches and other <br /> diversions outside excavation limits to convey rain water and water <br /> removed from excavations to collecting or runoff areas. Do not use <br /> trench excavations as temporary drainage ditches. <br /> H. Site grading shall conform to the grades indicated by the finish contours, <br /> cross-sections, and/or spot elevations on the Plans. Accuracy of finished <br /> grades shall be ±0.1 ft. Where topsoil, stone base, or other items are <br /> shown or called for, the rough grade shall be finished to such depth below <br /> finish grade as is necessary to accommodate these items. Excavation <br /> shall be made to the elevations, slopes, and limits called for on the Plans. <br /> I. All exposed soils in areas of cuts shall be proof rolled with a 15 to 20 ton <br /> pneumatic roller to locate any unconsolidated material. Should soft or <br /> unsuitable material be encountered at subgrade elevation, such material <br /> shall be removed and replaced with acceptable compacted borrow <br /> material, as directed by the Engineer. <br /> J. Fills, berms, dikes, and embankments shall be constructed of material that <br /> is reasonably free from grass, roots, rock, or other objectionable material. <br /> Where natural slopes exceed 4:1, horizontal benches shall be cut to <br /> receive fill material. Slopes of less than 4:1 and other areas shall be <br /> scarified prior to placing fill material. Keyways under dikes shall be <br /> constructed where indicated. <br /> K. Fills shall be formed of acceptable material placed in successive layers of <br /> not over 8 inches loose thickness for the full width of section, where <br /> practical. Where rock is excavated along with other material, it may be <br /> incorporated in fill sections which are not to support pavement or <br /> structures, and which lie outside the core areas of dikes (defined as the <br /> area within a 1:2.5 slope from the top edges of dikes). Rock shall be <br /> evenly distributed. Rock fragments larger than 4 inches in greatest <br /> dimension will not be allowed in the top 12 inches of fills or slopes. Voids <br /> between rock material are to be well filled with good material, and all rock <br /> shall be covered with at least 24 inches of earth. <br /> L. Materials for fills shall be spread evenly and the compaction equipment <br /> routed over the work to obtain uniform compaction. Fills under areas <br /> designated for structures and in dikes shall be compacted by approved <br /> equipment, to ninety-five percent (95%) of the Standard Proctor Maximum <br /> Dry Density as defined by ASTM D-698 as amended, except within two <br /> feet of subgrade where the fill shall be compacted to at least ninety-eight <br /> percent (98%) of Standard Proctor Maximum Dry Density. Fills under <br /> roadways and future paved surfaces shall be compacted to ninety-five <br /> Orange County DAA PN R00592-225N2 <br /> Walnut Grove Wastewater System January, 2021 <br /> 31 00 00-6 <br />