2908 49TH ST SW 2016-01-01 MF Import

GENERAL.NOTES 1. SCOPE OF WORK Contractor shall provide material, equipment, labor an, tools to complete the precast concrete block wall according to lines and grades shown on the drawing an.i in the field. 2. SITE CONDITIONS Contractor shall visit site and familia +ze himself with site conditions, and shall verify existing grades, dimensions and elevations in the field. �ontractor shall report any discrepancy with the drawing to Engineer (Liu & Associates, Inc.) before proceeding with wall construction. Contractor shall exercise extreme care not to damage any underground utilities, existing structures, drainage facilities, landscape, etc. Damage to the above shall be repaired and restored to their original condition or better at Contractor's expense. 3. MATERIAL 3.1 Precast Concrete Blocks: shall be 2.5'x2.5'x5.0' Ultrablocks by LOCK-BLOCK SYSTEMS or approved equal. 3.2 Levelina Base and Dreinaae Blanket: shall consist of clean, free-draining, 7/8-inch crushed rock. 3.3 Drain Line: shall be consist of min. 6-inch diameter, rigid, perforated, PVC pipes, with glued watertight joints and wrapped in a non-woven filter fabric sock. 3.4 Structural Fill: shall be clean granular soils free of organics and debris, with particles no larger than 3 inches. Structural fill shall contain no more than 20°/a by weight finer than the No. 200 sieve based on the fraction of the material passing No. 4 sieve. 3.5 Geoqrid Mesh: shall be those as specified on the drawing or approved equal. 4. INSTALL4TION 4.1 Keyway trench for the block wall shall be excavated down to firm, undisturbed, native soils or structural fill capable of rendering an allowable bearing pressure of at least 3,000 psf. The block wall foundation bearing soils shall be verified by a geotechnical engineer pri�� to wall construction. Exposed soils at bottom of keyway trench shall be compacted to a non-yieldirig state with a vibratory compactor. 4.2 Bottom of keyway trench shall be sioped to direct water into the drain pipe. Drain pipe shall have su�cient slope (0.5% minimum) to generate flow by gravity. Orain pipe shall be tightlined to discharge into a nearby stormwater detention pond. 4.3 The blocks of the wall should be tightly stacked against one another. 4.4 Structural fill shall be placed in liks no more than 10 inches in loose state, with each lift compacted to at least 92% of the maximum dry density determined by ASTM D1557 (Modified Proctor method) or compacted with su�cient passes of vibratory compactor until the compactor can no longer make indentation in the fill suil. 4.5 Each layer of geogrid mesh shall be laid on level surface, anchoretl between rows of blocks, stretched tight, and staked down, prior to placement of the next lift of structural fill. Cverlaps for geogrid mesh in the direction of wall alignment shall be at least 12 inches, overlaps in the direction perpendicular to wall alignmer• shall not be allowed. 5. INDEMNIFICATION 5.1 Contractor shall be solely responsible for construction safety and his methods, techniques, sequences or procedures used for the construction, and shall take necessary measure to maintain stability of cut banks during construction to prevent bodily injury or property damages. 5.2 Contractor shatt indemnify and save harmless the Owner and Engi�eer from and against any damage, cost and liability for injury or death to persons and from damage to property caused by negligence of Contractor: hislher agents, employees or subcontractors. LI U & ASSOCIATES, INC. --- - -- -- -_ Geotechniwl_Engineering • Engineering Geoiogy • Eatih Science � GENERAL NOTES - CONC. BLOCK WALL LOTS 5, 6& 7- SEA BREEZE PLAT SEr1 BREEZE WAY & 49TH STREET SW EVERETT, WASHINGTON