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TECHNICAL SPECIFICATIONS <br />G. CONTRACTOR shall conduct all excavation and shoring operations in compliance with applicable <br />MSHA, OSHA, Colorado State Laws, and Federal laws and regulations. <br />3.4 SUBGRADE <br />A. The MANAGER and CERTIFYING ENGINEER will inspect and approve the exposed subgrade <br />prior to the placement of the GCL liner. CQA MONITOR will confirm that the surface of the <br />subgrade shall have no sudden sharp or abrupt changes in grade; is smooth and free of debris, grade <br />stakes, angular rocks, roots, branches, vegetation, mud, ice, or frozen material. If the subgrade is <br />determined to be frozen, using the criteria identified in Item 3.5.10 of Section 2200, the <br />CONTRACTOR may either remove and replace the frozen subgrade or wait until subsequent <br />temperature monitoring indicates the fill is unfrozen, at no cost to CC &V. <br />B. CONTRACTOR is responsible for maintaining subgrades in a condition satisfactory to <br />CERTIFYING ENGINEER. CONTRACTOR shall protect prepared subgrades, including <br />previously approved subgrade, from weather, construction equipment, or other factors as outlined in <br />Part 3.4 of this SPECIFICATION. Subgrade surfaces (including previously approved subgrade) that <br />become softened or otherwise unsuitable for placement of fill shall be repaired to CERTIFYING <br />ENGINEER'S and MANAGER'S satisfaction at no cost to CC &V. <br />C. Prior to placement of fill materials, CONTRACTOR shall scarify all in -situ materials to a depth of 6- <br />inches, moisture condition, and recompact the subgrade. Compactive effort shall be adequate to obtain <br />a minimum of 95 percent of maximum dry density as determined by the standard Proctor test (ASTM <br />D698) for the particular fill material. Moisture conditioning shall be adequate to achieve a uniform <br />moisture and density. In rock areas, the CONTRACTOR shall prepare the subgrade by removing <br />loose rock fragments until competent foundation material is encountered as approved by <br />CERTIFYING ENGINEER. <br />D. If the underlying material is unsuitable to permit proper compaction of the subgrade, CONTRACTOR <br />shall loosen, aerate (or excavate and remove), and recompact the subgrade until the top layer can be <br />compacted as required. The recompacted surface shall then be scarified, as needed, to provide a good <br />bond between the foundation and fill materials. <br />3.5 FILL PLACEMENT <br />A. The following general guidelines shall be followed except as noted elsewhere in this section. <br />No fill materials shall be placed until the foundation and subgrade preparations have been <br />completed as specified herein, in article 3.4 of this section. The procedures for fill placement shall <br />be approved by MANAGER and CERTIFYING ENGINEER prior to start of fill placement. <br />2. No brush, roots, sod, frozen material, or other deleterious or unsuitable materials shall be <br />incorporated in the fills. The suitability of all materials intended for use in the fill shall be subject <br />to approval by MANAGER and CERTIFYING ENGINEER. Fill placement shall be temporarily <br />stopped by CONTRACTOR due to weather conditions, if materials and installation do not meet <br />the SPECIFICATIONS, at no cost to CC &V. Fill shall not be placed upon frozen material, such as <br />snow or ice. <br />If the surface of the prepared foundation or the surface of any layer of the fill is too dry or too <br />smooth to bond properly with the layer of material to be placed thereon, it shall be moisture - <br />conditioned and /or worked with harrow, scarifier, disc, or other suitable equipment to provide a <br />satisfactory bonding surface before fill material is placed thereon. If the surface of the prepared <br />foundation or the rolled surface of any layer is excessively wet for fill materials to be placed <br />thereon, it shall be removed and allowed to dry or worked with a harrow, scarifier, disc, or other <br />suitable equipment to reduce the moisture content to an acceptable level or meet project <br />specifications as determined by MANAGER and CERTIFYING ENGINEER. It shall then be <br />compacted before the next layer of fill material is placed. Determination of such dry or wet <br />conditions shall be made by CERTIFYING ENGINEER. <br />Earthworks September 24, 2013 <br />02200.0.1 -4 Revision 1 <br />S\Progects \1550 - CC &V Field Spt CQA PSES Bldg \80 Project Engineering and Design \82 Specificanons\PSES Pipe Rack Liner Extension SpecificahonsUndrvtdual Specification <br />Sections \02200 0 Rl Earthworks docx <br />