2009-12-21_REVISION - M1980244 (30)

Home Browse Search

ame subgrade is smooth and free of debris, grade stakes, angular rocks, roots, branches, vegetation, mud, ice, or frozen material. If the subgrade is determined to be frozen, using the criteria identified in Item 3.06. 10 of Section 2200, the CONTRACTOR may either remove and replace the frozen subgrade or wait until subsequent temperature monitoring indicates the fill is unfrozen, at no cost to CC &V. The subgrade shall have no sudden sharp or abrupt changes in grade. B. CONTRACTOR is responsible for maintaining subgrades in a condition satisfactory to CERTIFYING ENGINEER. CONTRACTOR shall protect prepared subgrades, including previously approved subgrade, from weather, construction equipment, or other factors as outlined in Part 3.06 of the SPECIFICATIONS. Subgrade surfaces, including previously approved subgrade, that become softened or otherwise unsuitable for placement of fill, shall be repaired to CERTIFYING ENGINEER's and MANAGER's satisfaction, at no cost to CC &V. C. Prior to placement of fill materials, CONTRACTOR shall scarify all in -situ materials to a depth of 6- inches, moisture condition, and recompact the subgrade. Compactive effort shall be adequate to obtain a minimum of 95 percent of maximum dry density as determined by the standard Proctor test (ASTM D698) for the particular fill material. Moisture conditioning shall be adequate to achieve a uniform moisture and density. In rock areas, the CONTRACTOR shall prepare the subgrade by removing loose rock fragments until competent foundation material is encountered as approved by CERTIFYING ENGINEER. D. If the underlying material is unsuitable to permit proper compaction of the subgrade, CONTRACTOR shall loosen, aerate (or excavate and remove), and recompact the subgrade until the top layer can be compacted as required. The recompacted surface shall then be scarified, as needed, to provide a good bond between the foundation and fill materials. 3.06 FILL PLACEMENT: A. The following general guidelines shall be followed except as noted elsewhere in this Section. No fill materials shall be placed until the foundation and subgrade preparations have been completed as specified herein, in Article 3.05 of this Section. The procedures for fill placement shall be approved by MANAGER and CERTIFYING ENGINEER prior to start of fill placement. 2. No brush, roots, sod, frozen material, or other deleterious or unsuitable materials shall be incorporated in the fills. The suitability of all materials intended for use in the fill shall be subject to approval by MANAGER and CERTIFYING ENGINEER. Fill placement shall be temporarily stopped by CONTRACTOR due to weather conditions, if materials and installation do not meet the SPECIFICATIONS, at no cost to CC &V. Fill shall not be placed upon frozen material, such as snow or ice. 3. If the surface of the prepared foundation or the surface of any layer of the fill is too dry or too smooth to bond properly with the layer of material to be placed thereon, it shall be moisture - conditioned and/or worked with harrow, scarifier, disc, or other suitable equipment to provide a satisfactory bonding surface before fill material is placed thereon. If the surface of the prepared foundation or the rolled surface of any layer is excessively wet for fill materials to be placed thereon, it shall be removed and allowed to dry or worked with a harrow, scarifier, disc, or other suitable equipment to reduce the moisture content to an acceptable level or meet project specifications as determined by MANAGER and CERTIFYING ENGINEER. It shall then be compacted before the next layer of fill Section 02200 Page 7 of 18 September 3, 2008 Earthworks Revision 1 SAPro1ects \112SE CCV CQA \I - Tech Specs \02200.rt.doc