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CITY OF EVERETT WEST MARINE VIEW DRIVE/ALVERSON AND 41 ST ST/GRAND AVE <br />PEDESTRIAN IMPROVEMENTS <br />STATE FUND# HLP-PB15(032) <br />WO #3630 July 25, 2024 <br />86 <br />1 Use safe and effective construction methods to prevent existing manhole from <br />2 moving or tipping during excavation to make new connection. <br />3 <br />4 Keep the manhole in operation at all times and take necessary precautions to <br />5 prevent debris or other material from entering the sewer, including a tight pipeline <br />6 bypass through the existing channel, if required. <br />7 <br />8 Core drill for pipe connections less than 28-inch O.D. Line drill or wall saw an <br />9 opening for pipe connection greater than 28-inch O.D.to accommodate the size <br />10 of pipe to be inserted. Interconnect drilled holes where line drilling is the method <br />11 used. Use a small core drill to accomplish line drilling. Jackhammer or rotary <br />12 hammer shall not be used. For line drilling provide minimum 1-inch and <br />13 maximum 2-inch clearance around the circumference of the pipe. Core drill <br />14 opening to accept a watertight flexible pipe to manhole connection in accordance <br />15 with manufacturers recommendations. Place upstream pipes, except PVC and <br />16 HDPE pipe, penetrating the manhole walls with the bell facing out and snug <br />17 against the outside wall of the structure as the angle of penetration allows. <br />18 Provide a flexible joint within 1/2 of a pipe diameter or 12-inches, whichever is <br />19 greater for pipe, except PVC and HDPE pipe, leaving or entering manholes. <br />20 <br />21 Place pipes entering or leaving the manhole on firmly compacted bedding. Take <br />22 particular care in compacting bedding within the area of the manhole excavation <br />23 that is normally deeper than the sewer trench. Take special care to ensure the <br />24 annual opening around each pipe entering the manhole is completely and firmly <br />25 rammed full of non-shrink grout to ensure water tightness. Non-shrink grout shall <br />26 conform to requirements of 9-03.20.3(2) of the Standard Specifications. <br />27 <br />28 Provide a watertight flexible pipe to manhole connector for pipe diameters less <br />29 than or equal to 24-inches for PVC or HDPE pipes connecting to manhole. Place <br />30 no PVC or HDPE pipe joint within 10-feet of the outside face of the manhole. <br />31 <br />32 7-05.3(4) Drop Manhole Connections <br />33 Delete the first paragraph in 7-05.3(4) and substitute the following: <br />34 Construct outside drop connections where shown on Plans in accordance with <br />35 these Special Provisions and 7-04, 7-05, and 7-17 of the Standard Specifications <br />36 and COE Standard Drawing No. 612. <br />37 <br />38 Construct inside drop connections where shown on the Plans, or as approved by <br />39 Engineer, in 54-inch diameter manholes or larger in accordance with these <br />40 Special Provisions and 7-04, 7-05, and 7-17 of the Standard Specifications and <br />41 COE Standard Drawing No. 613. <br />42 <br />43 Provide factory installed holes for drop connections for new manholes and core <br />44 drill holes for existing manholes. Impact tools shall not be allowed for making <br />45 holes in manhole walls. <br />46 <br />47 Supplement 7-05.3 by adding the following: <br />48 7-05.3(5) Furnish and Install Solid Lid for Catch Basins <br />49 (******) <br />50 Provide new solid lids on existing catch basins where shown on the Plans. <br />51 Provide solid lids conforming to 9-05.15 of the Standard Specifications, 9-