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I ' <br /> I SHANNON F�WILSON,INC. <br /> in our explore6ons, they frequently occur in such soils and their presencc should be <br /> Iantir,ipated by the wntractor. <br /> 'I�mporary excavation slopes may be used where space permits; otherwise properly <br /> � designed temporuy shoring should be provided. The "safe" accavadon slope depends on <br /> the following facWrs: 1) presence and quandty of groun�water; 2) type and density of soils; <br /> I3) depth of ezcavation; 4) surchaige loading adjacent to the excavation, such as that from <br /> I excavaced material, acisting structures, or construction equipment; and 5) time of <br /> � construcdon, among others. Because of the variables inwlvad, consistcnt with comentional <br /> ptacdce, temporary eacavation slopes should tx; the responsibiliry of the contrsctor, since the <br /> Icontractor is able to observe the nature and conditions of the subsurface materials <br /> encountered (including groundwater) and has the responsibility for methods, sequence, and <br /> i schedule of construction. If instability is detected, siopes shouid be flattened or shorad. <br /> Regardless of the consWction method used, all excavadon work should be accomplished in <br /> Icompliance with appropriate local, shate, and federal safety reguladons. <br /> I For planning purposes only, for excavations less than about 20 feet deep, we <br /> recommend that temporery cut slopes in glacial till and till-like soils be no steEper than <br /> 0.75H:1V, and in the near-surface Sll or weathered native soils be no steeper than 1.SH:1V. <br /> � Where loose soils or seepage wnes ar�e encountered, flatter slopes may be requirec. These <br /> recommendatio�s are consistent with Washington State Regulation WAC 296-155, Part N„ <br /> in which we eacpect that till-liloe soils should be classi6ed as Type A, and the near-surface <br /> ' 811 or loose soils should be classified as Type C. We recommend that such cut slopes be <br /> I protected wi�h waterproof cwering, as necessary, during periods of wet weather to reduce <br /> sloughing and erosion. <br /> IWe recommend that excavated material, stockpiles, or equipment should be placed no <br /> closer than a distance equal to the depth of the eaceavation from the top edge of the <br /> je�ccavation. <br /> 8.4.4 Structural Fill Material <br /> ISwctural fill is defined as fill that wiil be placed beneath foundadons, slabs, and <br /> � pavements, and in areas not classified as landscape areas• For discussing the neusability of <br /> I W-6643-01 <br /> 18 <br />