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378-11 Pond <br />•_ Drainfill shall be kept from being <br />contaminated by adjacent soil <br />materials during placement by _ <br />either placing it in a cleanly <br />excavated trench or by keeping the <br />drain at least 1 ft. above the <br />adjacent earthfill. <br />Selected drainfill and backfill <br />material shall be placed around <br />structuras,.pipe conduits, and <br />antiseap collars at approximately <br />I the same rate on al.l sides to <br />i prevent damage from unequal <br />loading. <br />~' Fill material shall be placed, <br />spread and compacted beginning at <br />the lowest point of the foundation <br />and then bringing it up in <br />horizontal layers thick enough <br />that the required compaction can <br />be obtained. The fill shall be <br />. constructed in continuous <br />horizontal layers. If openings or <br />sectionalized fills are required, <br />the slope of the bonding surfaces <br />between the embankment in place <br />and the embankment to be placed <br />shall not be steeper than a ratio <br />of three horizontal to one <br />vertical. The bonding surface <br />shall be treated the same as that <br />specified for the foundation to <br />insure a good bond with the new <br />fill. <br />and gradation, the more impervious <br />material shall be placed in the <br />center and upstream parts of the <br />fill. If zoned fills of <br />substantially differing materials <br />ara specified, the zones shall be <br />placed according to lines and <br />grades shown on the drawings or as <br />staked in the field. <br />Moisture control <br />The moisture content of the fill <br />material shall be adequate for <br />obtaining good compaction.. <br />Material that is too wet shall be <br />dried to meet this requirement, <br />and material that is too dry shall <br />be wetted and mixed until the <br />desired consistency is met. <br />Compaction <br />Each layer shall be thoroughly <br />compacted by routing construction <br />equipment corrugated or sheeps <br />foot roller, trucks or a heavily <br />loaded disc cultivator over the <br />area. A minimum of 2 longitudinal <br />passes shall be made. Each pass <br />shall consist of at least one <br />passage of an equipment wheel or <br />track over the entire surface of <br />the layer. <br />During construction, the top of <br />the embankment shall be maintained <br />as a horizontal plane the full <br />length and width thereof and no <br />side dumping of materials shall be <br />permitted. <br />The distribution and gradation of <br />materials shall be such that no <br />lenses, pockets, streaks, or <br />layers of material shall differ <br />• substantially in texture or <br />gradation from the surrounding <br />iaterial. If it is necessary to <br />ise materials of varying texture <br />If a minimum required density is <br />specified, each layer of fill <br />shall be compacted as necessary to <br />obtain that density. <br /> <br />