12-28-2015 Council Packet - Laserfiche WebLink

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Excavation Plan shall be submitted describing construction sequencing, limits of excavations, methods of protection for surrounding pipes and structures, and locations and extent of temporary bracing and sheeting employed. Such Excavation Plan shall be prepared or reviewed, approved, and signed by a geotechnical engineer registered in the State of Minnesota. E. Remove all organic and clay materials and material not suitable for load bearing structures. F. Excavate soft spots, fill with aggregate backfill material and recompact to densities specified. G. Backfill excavations made too deep with aggregate backfill and compact. H. Surface compact natural and fill soils prior to placing reinforcing steel. I. Contractor may use 4 to 6 inches of clear rock as a mud mat for a working platform for steel placement. This mud mat shall not displace any concrete thickness required. J. Protect bottom of excavation from frost at all times. Do not place foundations, footings, slabs, or fill on frozen soil. 3.05 USE AND STORAGE OF EXCAVATED MATERIALS A. Incorporate suitable excavated material into backfill around structures, embankments, trenches for piping and roadways. B. Use excavated materials which are unsuitable or exceed quantity needed as non- structural, grassland fill. C. Do not stockpile excavated materials near or over existing facilities, adjacent property, or completed work, unless approved in writing as part of Excavation and Embankment Plan. D. Do not place snow, ice, or frozen material in embankment fill or in backfill. E. Do not place stone or concrete fragments exceeding 3 inches in any dimension into the embankment fill or in backfills or trench backfills. F. Confine stockpiles to within property lines of the proposed water treatment facility site, refer to Drawings. G. All material needed for construction and grading, with the exception of topsoil, is to be excavated from within the Site limits. Contractor shall excavate material from approved areas if additional fill is required. 3.06 PLACING FILL AND BACKFILL A. Outside influence areas, beneath piping, structures, slabs, and other facilities and pipe trench backfill, place materials as follows: 1. Allow for 4 inch thickness of topsoil in sodded areas. 2. Allow for an additional 12 inch thickness of cohesive soil (clayey sand or sandy lean clay) to retard infiltration of water. 3. Maximum 6 -inch thick lifts. 4. Compact to minimum 100 percent of maximum density as determined in accordance with standard compactive effort ASTM D698. EXCAVATION AND FILL © 2015 Stantec 1 19380XXXX 31 23 00 - 4