3703 RAILWAY AVE KIMBERLY CLARK 2018-01-01 MF Import

05/29/02 10:19 FAS WATER DISTRIBUTTON 5-7.4(3) CRTBBING APfD SHEET�PTGSHORIN6 r�oos fhe con�actor shall adequ,ttely shore trenches to pro:ect the work, existin; properry, uriliries, pavement, etc., and to provide safe working conditions in the trench. The method of shonng shall be according to the con�actor's design. The contractor mr,y elect to use a combiaation of shoring and overbreak, [unneling, boring, sliding uench slvelds or other methods of accomplishing the work, provided the method meets all applicable local, state and federal safery codes. Damages resulting from improper cribbing or from failure to �:rib shall be the sole ruponsibiliry of the conuactor. See Secrion 3-9 Underground Udlities for addidonal rcquirements on shoring requirements. 5-7.4(4) UNSiJI'I'ABLE i�IA'I�R1AL Nhenever in excavating thE: uen�h for water mains and the bottom of the tn:nch ezposes peat, sofr clay, quicksand, or other unsuita'�le material, such material shall be removed from the �ench and replaced by Foundation Material Class A as specified in Section 3-20.6 of these Specifications. All unsuitable tpaterial shall be loaded direcfly into trucks and hauled to a waste site ohtained by the con�actor. Stockpiling of unsuitable material to the project site will not be allowed. 5-7.4(� BEDDING THL P7PE Bedding material, when specified or required by the engineer shall bc Everett Washed Course Sand No. Z as shown in Section 3-20.3 uf these Specifica[ions. Bedding is defined as 6 inches below the pipe, azound the pipe and 12 inches abov�; the pipe. Narive material will normally be used for:bedding for ducti.le iron pipe unless judged unsuitabl: by the engineer. ., :• "-7.4(� BACHFII.T.ING TRENCHES The contractor shall use s�:irable native excavated material for h�ench baekfill utiless notified by the engineer that the native material is unsuitable_ The eagineer will examine excavated nauve material at the timc of excavation to deteaiine its suitaUiliry for use as bacld'ill. Unsuitable backfill material shall be removed from the site, disp��sed of, and repiaced by Everett Washed Course Sand No. 2 as specified in Section 3-203 or Gcavel Bocrow as speeified in Section 3-20.2 of these Specifications and as d'uecied by [he engineer. In Uackfilling the �ench, the contracto[ shall take all necessary precautions [o protect the pipe �oa1 any damage or shifdng. The con�actor sball backfill from tLe side of the trench co a maximum uniform depth of 1 foot above the crown of the ductile iron pipe before starting mechanical compaction. During all phases of the bac1�'illing operations and testing as oudined herein, the conttactor shall protect the pipe installation, provide: for the maintenance of �affc as may be necessary, and provide for the safery of properry and persons. • See Section 3-9 for additioaal requirements on bacl�illing. 5-7.4(� COMPACTION I)F BACSFIT.L Trench backfill shall 6e spread in layers and be compacted by mechanical tampers of the impact rype approved by tl�e engineer. SVater settlmg will not be permitted. After the initial bar.l�'ill is placed the remanung bacl�ili material sl�all be placed in successive layers net exceeding 1 foot in loose thicl�ess, and each layer shall be compacted to the density specified below: a) Improved areas such ;�s sueet and sidewalk areas shall be compacted to 95% of max;m„m dry densiry. STANDARDS 5-6 � Rav, 10I00