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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 />128 <br />1 Over excavation and replacement of unsuitable foundation soils and replacement with <br />2 approved compacted fill will be compensated as agreed upon with the Engineer. <br />3 <br />4 8-26.3(1) Base Leveling Pad Installation <br />5 <br />6 Base leveling pad material shall be placed to the lines and grades shown on the <br />7 construction drawings, to a minimum thickness of 6" (150 mm) and extend laterally a <br />8 minimum of 6" (150 mm) in front and behind the CMB unit. <br />9 <br />10 Soil leveling pad materials shall be compacted to a minimum of 95% Standard Proctor <br />11 density per ASTM D698 or 92% Modified Proctor Density per ASTM D1557. <br />12 <br />13 Base leveling pad shall be prepared to insure full contact to the base surface of the <br />14 concrete units. <br />15 <br />16 8-26.3(2) CMB Unit Installation <br />17 CMB concrete units shall conform to the following construction requirements: <br />18 1) Vertical setback: 1" (25 mm) per course per the design; <br />19 2) Alignment and grid positioning mechanism fiberglass pins, two per unit <br />20 minimum. <br />21 3) Maximum horizontal gap between erected units shall be h 1/2" (13 mm). <br />22 <br />23 First course of CMB units shall be placed on the leveling pad at the appropriate line <br />24 and grade. Alignment and level shall be checked in all directions, ensuring that all units <br />25 are in full contact with the base and properly seated. <br />26 <br />27 Place the front of CMB units side-by-side. Do not leave gaps between adjacent CMB <br />28 units. Layout of corners and curves shall be in accordance with manufacturer’s <br />29 recommendations. <br />30 <br />31 Maximum stacked vertical height of wall units, prior to unit drainage fill and backfill <br />32 placement and compaction, shall not exceed two courses. <br />33 <br />34 8-26.3(3) Shear Connector Installation <br />35 Install shear/connecting devices per manufacturers recommendations. <br />36 <br />37 8-26.3(4) Unit Drainage Fill Installation <br />38 Place unit drainage fill within CMB units. Unit drainage fill shall be placed within the <br />39 cores of, between, and behind the units as indicated on the design drawings. Not less <br />40 than one cubic foot (0.028 m3), of unit drainage fill shall be used for each square foot <br />41 (0.093 m2) of wall face unless otherwise specified. <br />42 <br />43 8-26.3(5) Geogrid Soil Reinforcement Installation <br />44 Geogrid shall be oriented with the highest strength axis perpendicular to the wall <br />45 alignment. <br />46 <br />47 Geogrid reinforcement shall be placed at the strengths, lengths, and elevations shown <br />48 on the construction design drawings or as directed by the Engineer. <br />49